WO2005077297A1 - Denture attachment and method of manufacturing the same - Google Patents

Denture attachment and method of manufacturing the same Download PDF

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Publication number
WO2005077297A1
WO2005077297A1 PCT/JP2005/002645 JP2005002645W WO2005077297A1 WO 2005077297 A1 WO2005077297 A1 WO 2005077297A1 JP 2005002645 W JP2005002645 W JP 2005002645W WO 2005077297 A1 WO2005077297 A1 WO 2005077297A1
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WO
WIPO (PCT)
Prior art keywords
shaped yoke
cup
plate
seal ring
yoke
Prior art date
Application number
PCT/JP2005/002645
Other languages
French (fr)
Japanese (ja)
Inventor
Akira Kikuchi
Original Assignee
Neomax Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neomax Co., Ltd. filed Critical Neomax Co., Ltd.
Priority to CN2005800049623A priority Critical patent/CN1917828B/en
Publication of WO2005077297A1 publication Critical patent/WO2005077297A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0081Magnetic dental implant retention systems
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/225Fastening prostheses in the mouth
    • A61C13/235Magnetic fastening

Definitions

  • the present invention relates to a denture attachment for holding a denture using magnetic attraction by a permanent magnet.
  • Japanese Patent Application Laid-Open No. 4-227253 discloses a denture attachment 400 having a permanent magnet 402 therein and embedded in a denture base 420 and an alveolar 421 as shown in FIGS. 24 and 25.
  • a denture 430 having a soft magnetic keeper 423 installed on the root plate 422 and held on the root plate 422 by the magnetic attraction of the permanent magnet 402 and the keeper 423 is disclosed.
  • a soft magnetic stainless steel sealing disk 414 and a nonmagnetic stainless steel sealing ring 415 are concentrically arranged at the opening of a cup-shaped yoke 401 made of soft magnetic stainless steel.
  • the permanent magnet 402 is hermetically sealed by welding the entire circumference between the disc 414 and the seal ring 415 and between the seal ring 415 and the cup-shaped yoke 401.
  • the denture attachment 400 can satisfy requirements such as being harmless to the human body, being chemically stable for a long period of time, and having a large adsorption force V.
  • the magnetic attachment 400 shown in Fig. 25 has a slight gap between the cup-shaped yoke 401 and the seal ring 415 due to variations in the dimensions of the cap before welding.
  • the gap is filled by mixing the molten metals of both.
  • the circular welding is performed so as to fill the gap with the molten metal in one direction in order, so that the seal ring 415 is pulled when the molten metal cools, so that the welded portion contracts and the unwelded portion is removed. It was found that there was a problem that the gap was enlarged and the sealing disk 414 was greatly inclined.
  • Japanese Patent Laying-Open No. 11-137576 discloses a denture attachment having a structure shown in FIG. The denture attachment 500 shown in FIG.
  • the seal plate 513 is composed of a soft magnetic plate yoke 514 and a non-magnetic seal ring 515 clad around the outer periphery thereof.
  • the plate yoke 514, the non-magnetic seal ring 515, and the cup-shaped yoke At least the surface side is welded integrally with 501.
  • the seal plate 503 is press-fitted into the opening of the cup-shaped yoke 501, and there is no possibility that the seal plate 503 is inclined during the circular welding.
  • the operation of press-fitting the small plate-shaped yoke 504 into the small cup-shaped yoke 501 also requires precise control, which is difficult and difficult to automate, resulting in low productivity. Disclosure of the invention
  • an object of the present invention is to provide a denture attachment in which the recess of the cup-shaped yoke is sealed with excellent welding quality, has high magnetic attraction, and has good corrosion resistance.
  • Another object of the present invention is to provide a method for producing a strong denture attachment with a high production yield.
  • the denture attachment includes a permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet, and an opening in the recess of the cup-shaped yoke.
  • a sealing yoke which is fitted therein, wherein said sealing yoke has a plate-like yoke made of a corrosion-resistant soft magnetic material, and a seal ring which is provided on the outer periphery of said plate-like yoke and has a strong corrosion-resistant non-magnetic material.
  • the sealing plate is joined to the cup-shaped yoke by at least one full-circumferential weld formed so as to cover the butted portion of the sealing ring and the butted portion of the seal ring and the plate-shaped yoke. It is characterized by being sealed.
  • the magnetic attachment according to the embodiment of the present invention includes a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a permanent magnet, a recess for storing the permanent magnet, and having an enlarged diameter near an open end.
  • a sealing plate fitted to the enlarged diameter portion of the cup-shaped yoke comprising a plate-shaped yoke made of a corrosion-resistant soft magnetic material, and a corrosion-resistant non-magnetic material provided on the outer periphery of the plate-shaped yoke
  • the seal plate is formed by at least one full-peripheral weld formed to cover the butted portion of the seal ring and the butted portion of the seal ring and the plate-shaped yoke.
  • the step between the enlarged diameter portion and the concave portion is preferably 20 to 200 m.
  • a denture attachment includes a permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet, and an opening in the recess of the cup-shaped workpiece.
  • the seal plate is attached to the cup-shaped yoke by at least one full-circle welded portion formed so as to cover at least the butted portion of the cup-shaped yoke and the seal ring and the butted portion of the seal ring and the plate-shaped yoke.
  • the permanent magnet is sealed and the area near the opening end of the cup-shaped yoke is reduced without substantially changing its width. And characterized in that it.
  • a magnetic attachment includes a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a permanent magnet, a concave portion having an enlarged diameter near an open end for accommodating the permanent magnet, A sealing plate fitted into the enlarged diameter portion of the cup-shaped yoke, wherein the sealing plate is a plate-shaped yoke made of a corrosion-resistant soft magnetic material; A seal ring made of a corrosion-resistant non-magnetic material, which is disposed on the outer periphery; and a butt portion between the enlarged diameter portion of the cup-shaped yoke and the seal ring and a butt portion between the seal ring and the plate-like yoke.
  • the seal plate is joined to the cup-shaped yoke by at least one full-circumferential weld formed so as to cover, so that a magnetic gap is provided between the enlarged diameter portion and the permanent magnet.
  • the permanent magnet is sealed, and the diameter of the region near the opening end of the cup-shaped yoke is reduced without substantially changing its width.
  • the step between the enlarged diameter portion and the concave portion is preferably 20 to 200 m.
  • the spot welded portion may be (a) a butt portion between the cup-shaped yoke and the seal ring, or (b) a butt portion between the cup-shaped yoke and the seal ring, and the seal ring and the plate-shaped yoke. Is preferably formed on both the butted portions. Preferably, the spot welds are substantially equally spaced.
  • the full-circumferential welded portion includes: (a) a first welded portion formed so as to cover a butt portion between the cup-shaped yoke and the seal ring over the entire perimeter; Or (b) a butted portion of the cup-shaped yoke and the seal ring, the seal ring, and the plate. It is preferably an integral weld covering the butted portion of the yoke over the entire circumference.
  • the surfaces of the seal plate and the cup-shaped yoke are flat-plated after the entire circumference is welded.
  • a permanent magnet is housed in a recess of a cup-shaped yoke that also has a corrosion-resistant soft magnetic material, and is disposed on a plate-shaped yoke of the corrosion-resistant soft magnetic material and its outer periphery.
  • a seal plate comprising a seal ring made of a corrosion-resistant non-magnetic material is fitted into the opening of the cup-shaped yoke, and at least a butt portion of the cup-shaped yoke and the seal ring is spot-welded at a plurality of places to form the cup-shaped yoke.
  • the cup-shaped yoke and the seal plate are welded all around so as to cover the butted portion of the seal ring and the butted portion of the seal ring and the plate-shaped yoke.
  • the seal plate and the cup-shaped yoke are processed in a plane.
  • the seal plate since the seal plate is loosely fitted into the opening of the concave portion of the cup-shaped yoke, and the seal plate and the cup-shaped yoke are temporarily fixed by spot welding and then the entire circumference is welded.
  • the plate is welded almost parallel to the surface of the cup-shaped yoke without tilting, and the welded portion of the cup-shaped yoke and the seal plate has a substantially uniform shape, melting amount and melting depth over the entire circumference. And stable quality. Therefore, there is no possibility that the welded portion becomes locally shallow or a through hole is formed after the welding surface is flattened, and the sealing performance is not deteriorated. Therefore, the denture attachment of the present invention has a reduced diameter in the area near the opening end of the cup-shaped yoke, has high magnetic attraction, has good corrosion resistance, is durable, is inexpensive, and can be reduced in size and thickness. Can be.
  • FIG. 1 (a) is a plan view showing a denture attachment according to a first embodiment of the present invention.
  • FIG. 1 (b) is a cross-sectional view showing a state before welding the entire circumference of the denture attachment of FIG. 1 (a).
  • FIG. 1 (c) is a cross-sectional view showing a state of the denture attachment of FIG. 1 (a) after full-circumference welding.
  • FIG. 1 (d) is a cross-sectional view taken along the line A-0-A of FIG. 1 (a) (showing a state of the denture attachment of Example 1 after planar processing).
  • FIG. 2 is a schematic view showing a step of manufacturing the denture attachment of FIG. 1 (a) (each figure on the right shows a section taken along line A-0-A of the figure on the left).
  • FIG. 3 (a) is a plan view showing a welding surface of the denture attachment of FIG. 1 (a) before planar processing.
  • FIG. 3 (b) is a sectional view taken along line A-0-A in FIG. 3 (a).
  • FIG. 4 (a)] is a plan view showing a denture attachment according to a second embodiment of the present invention.
  • FIG. 4 (b) is a sectional view taken along line B-0-B of FIG. 4 (a).
  • ⁇ 5] is a schematic view showing a step of manufacturing the denture attachment of FIG. 4 (a) (each figure on the right shows a cross section B-0-B in the figure on the left).
  • FIG. 6 (a)] is a plan view showing a denture attachment according to a third embodiment of the present invention.
  • FIG. 6 (b) is a sectional view taken along line C-0-C of FIG. 6 (a).
  • FIG. 6 (a) is a schematic view showing a step of manufacturing the denture attachment of FIG. 6 (a) (each figure on the right shows a cross section C-0-C of the figure on the left).
  • FIG. 8 (a)] is a plan view showing a denture attachment according to a fourth embodiment of the present invention.
  • FIG. 8 (b) is a sectional view taken along the line D-0-D of FIG. 8 (a).
  • FIG. 9 (a)] is a plan view showing a denture attachment according to a fifth embodiment of the present invention.
  • FIG. 9 (b) is a sectional view taken along line E-0-E of FIG. 9 (a).
  • FIG. 10 is a sectional view showing a denture attachment according to a sixth embodiment of the present invention.
  • FIG. 11 (a) is a photograph partially showing a cross section of the vicinity of a left welded portion of a denture attachment according to a seventh embodiment of the present invention after a flat surface processing.
  • FIG. 11 (b)] is a photograph partially showing a cross section of the vicinity of the right welded portion of the denture attachment of FIG. 11 (a) after flattening.
  • FIG. 12 (a) is a diagram corresponding to FIG. 11 (a).
  • FIG. 12 (b) is a diagram corresponding to FIG. 11 (b).
  • FIG. 12 (c) is a cross-sectional view showing the entire structure of the denture attachment of FIG. 11 (a) after plane machining.
  • FIG. 13 (a) is a photograph partially showing an as-welded cross section near the left welded part of the denture attachment of Example 3.
  • FIG. 13 (b) is a photograph partially showing an as-welded cross section near the right welded portion of the denture attachment of Example 3.
  • FIG. 14 (a) is a diagram corresponding to FIG. 13 (a).
  • FIG. 14 (b) is a diagram corresponding to FIG. 13 (b).
  • FIG. 14 (c) is a cross-sectional view showing the entire structure of the denture attachment of FIG. 13 (a) in an as-welded state.
  • FIG. 15 is a schematic sectional view showing the inclination of the seal plate when the cup-shaped yoke and the seal plate are welded all around without a spot weld.
  • FIG. 16 is a partial cross-sectional perspective view showing a denture attachment obtained by pressing a seal plate into an opening of a cup-shaped yoke and then welding the cup-shaped yoke and the seal plate all around.
  • FIG. 17 is a plan view showing one sample of a denture attachment of Comparative Example 3.
  • FIG. 18 is a plan view showing another sample of the denture attachment of Comparative Example 3.
  • FIG. 19 is an enlarged view of a region A in FIG. 18.
  • FIG. 20 is a micrograph corresponding to FIG.
  • FIG. 21 is a micrograph showing a fitting portion of a seal plate of a denture attachment of Comparative Example 5.
  • FIG. 22 is a schematic diagram corresponding to the micrograph of FIG. 21.
  • FIG. 23 is a schematic view showing an apparatus for measuring a magnetic attraction force of a denture attachment.
  • FIG. 24 is a schematic cross-sectional view showing a state in which a denture having a denture attachment is mounted on a keeper installed on a root plate embedded in an alveolar cavity.
  • FIG. 25 is a schematic sectional view showing a conventional denture attachment.
  • FIG. 26 is a schematic sectional view showing a conventional denture attachment.
  • FIGS. 1 and 2 show a denture attachment according to a first embodiment of the present invention.
  • This denture attachment has the same basic structure as that shown in FIG. 25, and has a cup-shaped yoke 1 having a circular cross section formed with a soft magnetic material, also having a permanent magnet 2 housed therein, and an opening of a recess 1 ′. It consists of a seal plate 3 fitted in the mouth. Seal plate 3 seals permanent magnet 2 in recess 1 '. And a member forming a magnetic circuit, and is composed of a circular plate-shaped yoke 4 made of a soft magnetic material and a seal ring 5 made of a non-magnetic material having the same width and mounted on the outer periphery thereof. Have been.
  • the outer shapes of the cup-shaped yoke 1 and the seal plate 3 are not limited to circular shapes, but may be elliptical shapes or polygonal shapes such as squares.
  • corrosion-resistant soft magnetic stainless steel for example, SUS447J1, SUSXM27, SUS444, etc.
  • a corrosion-resistant non-magnetic stainless steel for example, SUS316L
  • the sealing plate 3 is formed by fitting a cylindrical member of a non-magnetic material to be a seal ring 5 to a round bar of a soft magnetic material to be a plate-shaped yoke 4, and performing drawing. It is preferable to form the resulting material by slicing it to a predetermined thickness.
  • the seal plate obtained by slicing is heat-treated in a reducing atmosphere at 600-880 ° C for 0.5-10 hours, preferably at 700-850 ° C for 18 hours, and cooled to room temperature.
  • the heat treatment condition is less than 600 ° C for 0.5 hour, no bonding occurs between the plate yoke 4 and the seal ring 5, and if the heat treatment exceeds 880 ° C for 0.5 hour, the interface between the plate yoke 4 and the seal ring 5
  • the denture attachment obtained by fusion and as shown in Comparative Example 3 described below has a low magnetic attraction force.
  • the heat treatment weakly (lightly) joins the disc to be the plate yoke 4 and the cylindrical material to be the seal ring 5.
  • the term “weak (light) joint” means that the area ratio of the fusion zone at the joint interface between the disk and the cylinder is less than 10%, especially less than 5%.
  • the heat treatment under the above conditions may be performed before slicing.
  • the seal plate 3 and the cup-shaped yoke 1 are manufactured separately, the fitting dimensions inevitably vary. Therefore, instead of press-fitting the seal plate 3 into the cup-shaped yoke 1 as in the conventional denture attachment, if the outer diameter of the seal plate 3 is set slightly smaller than the inner diameter of the cup-shaped yoke 1, the seal plate 3 is moved to the cup-shaped yoke. This is preferable because it can be easily fitted into the opening.
  • the gap X between the sealing plate 3 and the cup-shaped yoke 1 is preferably set to 10 to 60 m in order to ensure sealing by welding. As shown in FIG. 1B, the gap X is (the inner diameter of the cup-shaped yoke 1) ⁇ (the outer diameter of the sealing plate 3).
  • the seal plate 3 is fitted into the recess 1 ′ so as to be in close contact with the upper surface of the permanent magnet 2 housed in the recess 1 ′ of the cup-shaped yoke 1. At this time, the top of the seal plate 3 It almost coincides with the upper surface of the yoke 1.
  • the sealing plate 3 and the cup-shaped yoke 1 are welded by a laser or an electron beam, and the permanent magnet 2 inside is sealed in the yoke and sealed from the outside.
  • the welded portion is a spot welded portion 6 provided at a plurality of locations so as to cover the butted portion of the seal plate 3 and the cup-shaped yoke 1, the butted portion of the cup-shaped yoke 1 and the seal ring 5, and the seal ring 5 and the plate-shaped yoke. 4 and the entire circumference weld 7 formed to cover the butted portion.
  • the spot welded portion 6 is a portion that has been melt-solidified (welded) by irradiating a laser beam in a spot manner. At this time, the laser light may be moved if it is slight.
  • the laser spot diameter covers a part of the cup-shaped yoke 1 and the plate-shaped yoke 4 sandwiching the seal ring 5. Therefore, the plate-shaped yoke 4 is integrally fixed to the cup-shaped yoke 1 by the spot welds 6. However, this is not an essential requirement.When the seal ring 5 and the plate-shaped yoke 4 are firmly fixed by drawing, at least the butted portion of the cup-shaped yoke 1 and the seal ring 5 is fixed by the spot weld 6.
  • the spot welds 6 are provided at a plurality of locations (eg, 2 to 8 locations) at substantially equal intervals (symmetrically with respect to the point) with respect to the center axis of the seal plate 3.
  • the spot welds 6 include four spot welds 6a-6d.
  • the entire circumference welded portion 7 is formed by a butt portion between the cup-shaped yoke 1 and the seal ring 5, and a butt portion between the seal ring 5 and the plate-shaped yoke 4. Is integrally formed over the entire circumference.
  • the integral perimeter weld 7 is suitable when the width of the seal ring 5 is narrow, for example, 1Z2 or less of the spot diameter.
  • the integrated all-circumferential welded portion 7 is formed by simultaneously irradiating the cup-shaped yoke 1 and the plate-shaped yoke 4 with laser light with the seal ring 5 interposed therebetween.
  • the cup-shaped yoke 1 has the same width w from near the bottom surface of the concave portion 1 'to near the open end.
  • the outer diameter Dou 'near the opening end of the recess 1' is smaller than the outer diameter Dob near the bottom of the recess 1 'of the cup-shaped yoke 1.
  • ! / Ru (Dob> Dou ') As shown in Fig. 1 (d), the outer diameter Dou becomes Dou after plane processing.
  • the welding surface of the seal plate 3 and the cup-shaped yoke 1 is flattened by polishing or the like.
  • the planar processing the local unevenness of the welded portion is removed, and a smooth surface 9 is formed. Since the smooth surface 9 of the denture attachment is in good contact with the root plate embedded in the alveolar cavity, there is no magnetic flux disturbance. As a result, the denture fitted with the denture attachment of the present invention is firmly held in the alveolar cavity.
  • FIG. 2 shows a manufacturing process of the denture attachment of FIG. 1 (a).
  • the permanent magnet 2 is housed in the recess 1 ′ having a circular cross section of the soft magnetic cup-shaped yoke 1, and the seal plate 3 is fitted into the opening of the recess 1 ′.
  • the tip of the inclined holding member 3a is placed almost at the center of the seal plate 3, and the seal plate 3 is fixed [step (a)].
  • spot welding at a plurality of locations 6a ⁇ 6b ⁇ 6c ⁇ 6d is performed so as to cover the butted portion la of the cup-shaped yoke 1 and the seal ring 5 and the butted portion 4a of the seal ring 5 and the plate-shaped yoke 4.
  • Step (b)] is performed in order.
  • spot welding in the order of the diagonal points 6a ⁇ 6b ⁇ 6c ⁇ 6d using the laser irradiation device 3b in this manner, the shrinkage force applied to the seal plate 3 when the molten metal is cooled and solidified is reduced and The balance can be achieved, and the floating of the seal plate 3 as in the prior art can be prevented.
  • the seal plate 3 is firmly fixed to the cup-shaped yoke 1 by the obtained spot welds 6a to 6d.
  • the heat treatment is performed.
  • spot welding may be performed only on the butted portion la of the seal ring 5 and the cup-shaped yoke 1.
  • the spot diameter covering the butted portion la of the cup-shaped yoke 1 and the seal ring 5 and the butted portion 4a of the seal ring 5 and the plate-shaped yoke 4 The laser beam is continuously or intermittently irradiated to form the entire circumferential weld 7 [step (d)]. Since the seal plates 3 are fixed to the cup-shaped yoke 1 at substantially equal intervals, a uniform full-circle weld 7 can be obtained under stable welding conditions such that the seal plates 3 do not shift during full-circle welding.
  • FIG. 3 (a) shows the surface condition of the cup-shaped yoke 1 and the seal plate 3 after the entire circumference welding
  • FIG. 3 (b) shows the cross-section.
  • the spot welds 6a to 6d are concealed by the entire circumference weld 7 but the spot denoted by reference numeral 7 'is the end of the full circumference weld.
  • the cup-shaped yoke 1 on which welding has been completed is set on a plane polishing machine, and the welded surfaces of the cup-shaped yoke 1 and the seal plate 3 are flat-worked (polished) to a predetermined depth ⁇ (step (e)).
  • the depth of cut ⁇ is about 10 i um—about 100 i um, preferably 40 i um—, so that the cup-shaped yoke 1 and the seal plate 3 are at the same height and the unevenness of the entire weld 7 is not left. It should be 60 i um. If ⁇ is less than 10 ⁇ m, irregularities remain on the surface.
  • the sealing plate 3 is welded almost parallel to the cup-shaped yoke 1 without tilting, the shape of the molten portion, the amount of fusion and the depth of fusion are substantially uniform over the entire circumference even after the flat surface processing, and the molten portion is There is no reduction in sealing performance due to local shallowness or through holes.
  • heat treatment is performed after the planar processing. Is preferred. This heat treatment is preferably performed in an inert gas atmosphere at a temperature of 600 to 1100 ° C for 0.5 to 10 hours, preferably 700 to 900 ° C for 5 hours, and then cooled to room temperature. If the heat treatment conditions are less than 0.5 hours at 600 ° C X, the effect of the heat treatment is not sufficient. The force is greatly reduced, and the thermal deformation of the cup-shaped yoke and the seal plate cannot be ignored. Finally, it is magnetized to obtain the denture attachment of the present invention.
  • the cup-shaped yoke 1 is slightly deformed inward. Since the sealing plate 3 is fixed to the cup-shaped yoke 1 by spot welding and the entire circumference is welded, deformation occurs almost uniformly in the circumferential direction. This deformation z ′ is almost half of the gap X. This is because the amount of inward deformation of the cup-shaped yoke 1 is z ′ at both ends in the diametrical direction, and is 2 ° ′ as a whole. For example, when the seal plate 3 is thinned by about 20% by the flat processing, the deformation amount ⁇ after the flat processing is about 80% of ⁇ ′. In general, the deformation ⁇ is about 10-40 m.
  • FIGS. 4 (a) and 4 (b) show a denture attachment according to the second embodiment of the present invention
  • FIG. 5 shows a manufacturing process thereof.
  • spot welds 26e, 26g, 26i, 26k covering the first butted portion 21a of the cup-shaped yoke 21 and the seal ring 25, and the second butted portion 24a of the seal ring 25 and the plate-shaped yoke 24
  • Spot welds 26f, 26h, 26j, 261 that cover the first and second full-circle welds 27a and 27b, respectively, on the first butt 21a and the second butt 24a.
  • Adjacent spot welds 26e and 26f, 26g and 26h, 26i and 26j, and 26k and 261 do not overlap, nor does the first full circumference weld 27a and the second full circumference weld 27b. . Since the non-magnetic seal ring 25 is exposed between the first full circumference weld 27a and the second full circumference weld 27b, a short circuit of magnetic flux between the cup-shaped yoke 21 and the plate-shaped yoke 24 can be prevented. It can be effectively prevented.
  • the method of manufacturing the denture attachment of the second embodiment is the same as that of the first embodiment, except that the spot welds 26e-261 and the entire circumferential welds 27a and 27b are individually formed.
  • FIGS. 6 (a) and 6 (b) show a denture attachment according to a third embodiment of the present invention
  • FIG. 7 shows a manufacturing process thereof.
  • the denture attachment of this embodiment includes a spot welded portion 36e, 36g, 36i, 36k covering the first butted portion 31a of the cup-shaped yoke 31 and the seal ring 35, and a second butted portion of the seal ring 35 and the plate-shaped yoke 34.
  • the first and second full-circle welds 37a, 36h, 36j, and 361 respectively cover the first and third full-circle welds 37a and 34a.
  • reference numeral 36m is a portion where the spot welds 36k and 361 overlap
  • reference numeral 37c is a portion where the first full circumference weld 37a and the second full circumference weld 37b overlap. As shown by the dotted line in FIG.
  • the overlapping portion between the first full-circumferential welded portion 37a and the second full-perimeter welded portion 37b is located at the substantially central portion of the seal ring 35. Since the soft magnetic material of the plate-like yoke 34 is hardly mixed, there is no particular problem in the magnetic circuit. Moreover, the above-mentioned overlapping part is almost removed by plane processing.
  • FIGS. 8 (a) and 8 (b) show a denture attachment according to a fourth embodiment of the present invention.
  • the denture attachment of this embodiment includes a spot welded portion 46a-46d that covers the first butted portion of the cup-shaped yoke 41 and the seal ring 45 and the second butted portion of the seal ring 45 and the plate-shaped yoke 44.
  • the first butting portion and the second butting portion each have a first full circumference welded portion 47a and a second full circumference welded portion 47b.
  • the spot welds 46a-46d are formed in the same manner as in the first embodiment, and the first full circumference weld 47a and the second full circumference weld 47b are formed in the same manner as the third embodiment.
  • FIGS. 9 (a) and 9 (b) show a denture attachment according to a fifth embodiment of the present invention.
  • the denture attachment of this embodiment is the same as that of the first embodiment except that a Ni plating layer 54b is provided between the plate-like yoke 54 of the seal plate 53 and the seal ring 55. If the Ni plating layer 54b has a thickness of, for example, 15 m, the radius of the seal plate 53 is reduced accordingly. When the Ni plating layer 54b is melt-mixed with the soft magnetic material of the seal plate 53, it changes into a non-magnetic alloy, so that leakage of magnetic flux between the plate yoke 54 and the cup yoke 51 can be effectively prevented. .
  • FIG. 10 shows a denture attachment according to a sixth embodiment of the present invention.
  • the denture attachment of this embodiment has a cup-shaped yoke 61 having an enlarged diameter portion 61c.
  • Other points are the same as those of the denture attachment of the second embodiment.
  • the radial depth (w-w) of the enlarged diameter portion 61c is about 20-200 ⁇ m. It is preferred that
  • the height h (distance between the upper end surface of the cup-shaped yoke 61 and the lower end of the step 61d) of the enlarged diameter portion 61c is It is preferably about 200 to 400 m. It is preferable that the inclination angle (the angle with the horizontal line) of the step 61d is 0-60 °.
  • the outer appearance is characterized in that the area near the opening end of the concave portion 61c is smaller in diameter than the outer diameter near the bottom of the enlarged diameter portion 61c of the cup-shaped yoke 61.
  • the inner end of the seal ring 65 is preferably located inside the side surface of the permanent magnet 62 in order to effectively prevent the leakage of magnetic flux. Therefore, the thickness of the seal ring 65 is preferably about 40 to 400 ⁇ m.
  • the cup-shaped yoke and the disk-shaped yoke were formed of corrosion-resistant soft magnetic stainless steel SUS447J1 (saturated magnetization Bs: 1.28 T), and the seal ring was formed of corrosion-resistant nonmagnetic stainless steel SUS316L.
  • the disk-shaped permanent magnet is made of Nd-Fe-B anisotropic sintered magnet (NEOMAX NMX-48CH, residual magnetic flux density Br: 1.35 T, maximum energy product (BH) max: 366 kj / m 3 ) Formed.
  • the dimensions of the permanent magnet were 2.55 mm in outer diameter and 0.4 mm in height.
  • Cup-shaped yokes and seal plates of the sizes shown in Table 1 were used.
  • This seal plate is made by fitting a cylindrical material to be a seal ring to a round bar for a disk-shaped yoke, slicing it to a thickness of 0.2 mm, heat-treating it at 800 ° C in a reducing atmosphere, It has been cooled down.
  • the obtained seal plate had a weakly joined shield ring on the outer periphery of the disk-shaped yoke.
  • Temporary fixation was performed by spot welding using a laser beam with a spot diameter, and then welding was performed with a laser beam with a spot diameter of 0.5 mm along the same circumference of 2.4 mm diameter [Fig. L (c)].
  • the opening of the cup-shaped yoke 1 immediately after the welding was reduced by z ′. This is because the region near the opening end of the cup-shaped yoke 1 was deformed in a direction to fill the gap X between the cup-shaped yoke 1 and the seal plate 3.
  • the lap was polished to a depth ⁇ of 0.05 mm, and the weld surface was finished so as to have a maximum surface roughness Rmax force l / zm or less, and the denture attachment shown in FIGS. 1 (a) and (d) was produced.
  • the depth of the weld after flattening was uniform at 0.1 mm.
  • plane polishing 800 Heat treatment was performed for 1 hour in an argon atmosphere at ° C. The reduction in the outside diameter of the opening of the cup-shaped yoke 1 was reduced to z (value in Table 3) after surface polishing [Figure l (d)].
  • the magnetic attachment was magnetized after planar polishing.
  • the apparatus shown in FIG. 23 was used for measuring the magnetic attractive force.
  • This measuring device supports a chuck 93 for fixing a denture attachment 90, a digital force gauge 95 connected to the chuck 93 via an adapter 94, a fine movement device 96 for moving the digital force gauge 95, and a fine movement device 96.
  • the stand includes a stand 97 and a support member 92 fixed to the stand 97 so as to support the keeper 91. With the denture attachment 90 fixed to the chuck 93 and the keeper 91 fixed to the support member 92 attracted, the fine movement device 96 is gradually raised, and the digital force gauge when the denture attachment 90 is separated by the keeper 91 force. A value of 95 was read. The magnetic attraction force was measured for ten denture attachments 90, and the average of the obtained values was defined as the magnetic attraction force.
  • a cup-shaped yoke and a seal plate having the sizes shown in Table 1 (the seal plate had a misalignment in which the shield ring was weakly joined to the outer periphery of the disk-shaped yoke as in Example 1) were used. Assemble as shown in Fig. 5, and as shown in Table 2, a circumference of 2.6 mm in diameter covering the butted portion of cup-shaped yoke 21 and seal ring 25 (centering on point 0 in Fig. 5 (a)).
  • the first spot welding is performed by laser beam with a spot diameter of 0.2 mm at 90 ° equiangular intervals along with), and a circle with a diameter of 2.2 mm covers the butted portion of the seal ring 25 and the plate-shaped yoke 24.
  • a second spot welding is performed along the circumference (centered at point 0 in Fig. 5 (a)) with laser light having a spot diameter of 0.2 mm at equiangular intervals of 90 °. Temporarily fixed to 21.
  • the first full circumference welding is performed using a laser beam with a spot diameter of 0.2 mm, and the same diameter as the circumference of the second spot welding.
  • a second full circumference weld was performed using a laser beam with a spot diameter of 0.2 mm along the circumference of 2.2 mm [Fig. 5 (d)].
  • the weld surface is flattened by polishing to a depth ⁇ of 0.05 mm. The denture attachment shown in FIGS. 4 (a) and 4 (b) was produced.
  • a denture attachment shown in FIG. 6 was produced in the same manner as in Example 2 except that the spot diameter of the laser beam for spot welding and the laser beam for all-around welding were each 0.3 mm, and the characteristics were measured. Table 3 shows the measurement results.
  • a denture attachment shown in FIG. 8 was prepared and the characteristics were measured in the same manner as in Example 1 except that the entire circumference was welded in the same manner as in Example 7.
  • Table 3 shows the measurement results.
  • a denture attachment shown in FIG. 9 was produced in the same manner as in Example 1 except that a Ni plating layer having a thickness of 15 ⁇ m was provided between the plate-shaped yoke and the seal ring, and the characteristics were measured. Table 3 shows the measurement results.
  • a denture attachment shown in FIG. 10 was produced in the same manner as in Example 26 except that a cup-shaped yoke having a step 61d in the concave portion 61 ′ was used.
  • Micrographs of the cross section of the weld are shown in Figs. 11 (a) and (b).
  • the outer surface near the opening end of the concave portion of the cup-shaped yoke 71 has a perpendicular UU (the perpendicular UU is permanent).
  • the outer diameter Dou at the opening end of the recess (position Q) is smaller than the outer diameter Dob near the bottom (position ⁇ ) of the enlarged diameter portion of the recess of the cup-shaped yoke 71. (Dob> Dou).
  • the width w of the cup-shaped yoke 71 did not change until the force near the bottom of the enlarged diameter portion (position P) reached the open end of the concave portion (position Q).
  • FIGS. 14 (a) and (b) are diagrams corresponding to the micrographs of FIGS. 13 (a) and (b), and FIG. 14 (c) shows a cross-sectional shape of the entire denture attachment.
  • Table 3 shows the measurement results of the characteristics of the denture attachment.
  • Example 2 As shown in Tables 1 and 2, using the same cup-shaped yoke and seal plate as in Example 1 (the gap between the two was 30 / zm), the same entire circumference welding as in Example 1 was performed without spot welding. However, as shown in FIG. 15, the seal plate 103 was completely lifted up on the beam of the cup-shaped yoke 10, and a force was not able to complete the entire circumference welding (see Table 3).
  • Example 7 As shown in Tables 1 and 2, using the same cup-shaped yoke and seal plate as in Example 7 (the gap between them was 30 m), the same perimeter welding as in Example 7 was performed without spot welding. However, the seal plate completely lifted above the cup-shaped yoke, and the entire circumference welding could not be completed.
  • the denture was prepared in the same manner as in Example 1 except that the outer diameter of the seal plate and the inner diameter of the recess of the cup-shaped yoke were the same, and the seal plate was pressed into the recess of the cup-shaped yoke. Attachments were made. Press-fitting the seal plate was a cumbersome operation.
  • the obtained denture attachment had a burr 201b between the cup-shaped yoke 201 and the seal ring 205, as shown in FIG. 16, and the cup-shaped yoke 201 was slightly deformed outward.
  • the amount of deformation z (the radius of the outer periphery 201R-the radius of the outer periphery 201r) is displayed as a minus.
  • 201R indicates the outer circumference after the entire circumference welding
  • 201r indicates the outer circumference after the press-fitting and before the welding.
  • Table 3 shows the measurement results of the characteristics of the denture attachment.
  • the outer circumference of the end face of the cup-shaped yoke 201 is moved from 201r by full circumference welding.
  • Bs is cup r r R
  • the saturation magnetization of the magnetic field Bm is the residual magnetic flux density of the permanent magnet
  • Sm is the cross-sectional area of the permanent magnet. If the area of the end face of the yoke is smaller than S, the flow of magnetic flux deteriorates (since local magnetic saturation occurs), so that magnetic flux leakage becomes remarkable and the magnetic attraction force is greatly reduced.
  • the design is made to obtain the optimum S when the outer periphery of the cup-shaped yoke is contracted, so that the magnetic attraction force increases.
  • the measurement results of the magnetic attraction force of Comparative Example 5 shown in Table 3 were clearly lower than those of Example 1.
  • FIG. 17 shows a state in which a gap is formed on one side of the butted portion of the cup-shaped yoke 201 and the seal ring 205 when the seal plate is pressed into the cup-shaped yoke 201. Since the inner diameter of the cup-shaped yoke 201 is equal to the outer diameter of the seal plate, if one end of the outer periphery of the seal plate is inserted into the opening of the cup-shaped yoke 201, the other end of the outer periphery of the seal plate is inevitably connected to the cup. Hooked on the opening edge of the yoke 201.
  • FIG. 18 shows a portion where the cup-shaped yoke 301 and the seal ring 305 abut when the seal plate in which the plate-shaped yoke 304 and the seal ring 305 are not firmly fixed is pressed into the cup-shaped yoke 301. And a state in which a gap deviated to one side is generated at the butted portion of the plate-shaped yoke 304 and the seal ring 305.
  • FIG. 19 is an enlarged view of part A of FIG. 18, and FIG. 20 is a micrograph of that part. As is clear from FIGS. 19 and 20, the cup-shaped yoke 301 Glue 305b remained at the butted portion with thread ring 305.
  • FIG. 21 is a photomicrograph showing the vicinity of the butted portion of the sample in FIG. 20, and FIG. 22 is a schematic view corresponding thereto. Since the seal ring 305 before press-fitting has a rectangular cross-section, it can be seen that the outer end of the seal ring 305 is shaved. Burrs 301b and 305b were observed between the corner of the seal ring 305 and the yoke 301.
  • the denture attachment was performed in the same manner as in Example 7 except that the outer diameter of the seal plate and the inner diameter of the recess of the cup-shaped yoke were the same, and the seal plate was pressed into the recess of the cup-shaped yoke. Was prepared. Press-fitting the seal plate was a cumbersome operation.
  • Table 3 shows the measurement results of the characteristics of the obtained denture attachment. The measurement results of the magnetic attraction force of Comparative Example 4 shown in Table 3 were clearly lower than those of Example 1.
  • Cup-shaped yoke Seal plate Outline (>> recess (2) Step Disc-shaped Ni ⁇ 3 >
  • a 15 m thick nickel plating layer was provided on the outer periphery of the disk-shaped yoke (the outer diameter of the plate-shaped yoke including the nickel plating layer was 2.17 m).
  • the opening end force has an enlarged diameter part (inner diameter: 2.75 mm) to a depth of 0.30 mm, a diagonal step from 0.30 mm to 0.38 mm in depth, and an inner diameter in a part deeper than that.
  • Inner diameter 2.75 mm
  • Example 1 30 Yes No 2 12 0 6.38 Example 2 30 Yes No 2 12 0 6.43 Example 3 10 Yes No 2 4 0 6.43 Example 4 20 Yes No 2 8 0 6.43 Example 5 40 Yes No 2 16 0 6.43 Example 6 50 Yes No 4 20 0 6.43 Example 7 30 Yes No 2 12 0 6.33 Example 8 30 Yes No 2 12 0 6.33 Example 9 30 Yes No 2 12 0 6.43 Example 10 30 Yes No 2 12 0 6.62 Example 11 10 Yes No 2 4 0 6.62 Example 12 20 Yes No 2 8 0 6.62 Example 13 40 Yes No 2 16 0 6.62 Example 14 50 Yes No 4 20 0 6.62 Example 15 30 Yes No 2 12 0 6.52 Comparative Example 1 30 None None> 0.2 ⁇ Comparative Example 2 30 None None--> 0.2 ⁇ Comparative Example 3 0 None With 35 -20 0 6.23 Comparative Example 4 0 None With 35 -20 0 6.08 Comparative Example 5 0 None With 35 • 20 0 6.23 Comparative example 6 70 Yes No 10 ⁇ 0 6.33

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
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  • Dental Prosthetics (AREA)

Abstract

A denture attachment, comprising a permanent magnet, a cup-like yoke formed of a corrosive resistant soft magnetic material having a recessed part for storing the permanent magnet, and a seal plate fitted to the opening part of the recessed part of the yoke. The seal plate further comprises a plate-like yoke formed of the corrosive resistant soft magnetic material and a seal ring formed of a corrosive resistant non- magnetic material disposed on the outer periphery of the plate-like yoke. The denture attachment is characterized in that the seal plate is joined to the yoke by a plurality of spot welded parts in which at least a butted part between the yoke and the seal ring is fixed and at least one welding-all-around part formed to cover the butted part between the yoke and the seal ring and the butted part between the seal ring and the plate-like yoke so as to seal the permanent magnet.

Description

明 細 書  Specification
義歯アタッチメント及びその製造方法  Denture attachment and method of manufacturing the same
技術分野  Technical field
[0001] 本発明は永久磁石による磁気吸引力を利用して義歯を保持する義歯アタッチメント [0001] The present invention relates to a denture attachment for holding a denture using magnetic attraction by a permanent magnet.
、及びその製造方法に関する。 And a method for producing the same.
背景技術  Background art
[0002] 特開平 4-227253号には、図 24及び図 25に示すように、内部に永久磁石 402を有す るとともに義歯床 420に埋め込まれた義歯アタッチメント 400と、歯槽 421に埋設された 根面板 422に設置された軟磁性キーパ 423とを有し、永久磁石 402とキーパ 423との磁 気吸引力により根面板 422に保持される義歯 430が開示されて 、る。義歯アタッチメン ト 400は、軟磁性ステンレス鋼製のカップ状ヨーク 401の開口部に軟磁性ステンレス鋼 製のシール円板 414と非磁性ステンレス鋼製のシールリング 415とが同心状に配置さ れ、シール円板 414とシールリング 415の間及びシールリング 415とカップ状ヨーク 401 の間が全周溶接されて永久磁石 402が密封された構造を有する。義歯アタッチメント 400は、人体に対し無害であること、長期間化学的に安定であること、吸着力が大き V、こと等の要求を満足することができる。  Japanese Patent Application Laid-Open No. 4-227253 discloses a denture attachment 400 having a permanent magnet 402 therein and embedded in a denture base 420 and an alveolar 421 as shown in FIGS. 24 and 25. A denture 430 having a soft magnetic keeper 423 installed on the root plate 422 and held on the root plate 422 by the magnetic attraction of the permanent magnet 402 and the keeper 423 is disclosed. In the denture attachment 400, a soft magnetic stainless steel sealing disk 414 and a nonmagnetic stainless steel sealing ring 415 are concentrically arranged at the opening of a cup-shaped yoke 401 made of soft magnetic stainless steel. The permanent magnet 402 is hermetically sealed by welding the entire circumference between the disc 414 and the seal ring 415 and between the seal ring 415 and the cup-shaped yoke 401. The denture attachment 400 can satisfy requirements such as being harmless to the human body, being chemically stable for a long period of time, and having a large adsorption force V.
[0003] 図 25に示す磁気アタッチメント 400には、このような構造のため、溶接前には、カップ 状ヨーク 401とシールリング 415との間にはカ卩ェ寸法のバラツキにより若干の隙間があ る。カップ状ヨーク 401とシールリング 415の溶接では、両者の溶融した金属が混合さ れて隙間が埋められる。しかし磁気アタッチメント 400では、この隙間を一方向に順に 溶融金属で埋めるように周回溶接を行うので、シールリング 415は溶融金属が冷却す る際に引っ張られ、溶接部が収縮するとともに未溶接部の隙間が拡大し、もってシー ル円板 414が大きく傾くという問題があることが分った。周回溶接中にシール円板 414 が傾くと、シール円板 414とカップ状ヨーク 401の隙間が拡大されるだけでなぐ未溶 接部が浮き上がり、両者間に段差が生じる。その結果、溶融の範囲及び深さ等が一 定しない溶接部が形成される。これにより接合強度が弱くなつたり、密封性が不十分 となったりし、製造歩留まりが低下する。 [0004] 特開平 11-137576号には、図 26に示す構造の義歯アタッチメントが開示されている 。図 26の義歯アタッチメント 500は、磁石体 502と、磁石体 502を収納する凹所を有する 軟磁性カップ状ヨーク 501と、磁石体 502を封入するようにカップ状ヨーク 501の開口部 に嵌合されたシール板 513とからなり、シール板 513は軟磁性板状ヨーク 514と、その 外周にクラッド接合された非磁性シールリング 515とからなり、板状ヨーク 514と非磁性 シールリング 515とカップ状ヨーク 501との間は少なくもその表面側が一体的に溶接さ れている。 [0003] Due to such a structure, the magnetic attachment 400 shown in Fig. 25 has a slight gap between the cup-shaped yoke 401 and the seal ring 415 due to variations in the dimensions of the cap before welding. You. In the welding of the cup-shaped yoke 401 and the seal ring 415, the gap is filled by mixing the molten metals of both. However, in the magnetic attachment 400, the circular welding is performed so as to fill the gap with the molten metal in one direction in order, so that the seal ring 415 is pulled when the molten metal cools, so that the welded portion contracts and the unwelded portion is removed. It was found that there was a problem that the gap was enlarged and the sealing disk 414 was greatly inclined. If the sealing disk 414 is tilted during the circular welding, the gap between the sealing disk 414 and the cup-shaped yoke 401 is not only enlarged, but the unwelded portion rises, and a step is generated between the two. As a result, a weld is formed in which the range and depth of melting are not fixed. As a result, the bonding strength is weakened, the sealing property is insufficient, and the production yield is reduced. [0004] Japanese Patent Laying-Open No. 11-137576 discloses a denture attachment having a structure shown in FIG. The denture attachment 500 shown in FIG. 26 is fitted into the opening of the cup-shaped yoke 501 so as to enclose the magnet 502, a soft magnetic cup-shaped yoke 501 having a recess for accommodating the magnet 502, and the magnet 502. The seal plate 513 is composed of a soft magnetic plate yoke 514 and a non-magnetic seal ring 515 clad around the outer periphery thereof. The plate yoke 514, the non-magnetic seal ring 515, and the cup-shaped yoke At least the surface side is welded integrally with 501.
[0005] 図 26に示す磁気アタッチメント 500では、シール板 503がカップ状ヨーク 501の開口 部に圧入されており、周回溶接中にシール板 503が傾くおそれはないが、数 mm程度 の直径の義歯アタッチメント 500の組立の際にカップ状ヨーク 501の開口部に板状ョー ク 504を完全に水平に圧入するのは困難であり、通常は圧入された板状ヨーク 504が 僅かに傾斜したままカップ状ヨーク 501に溶接されることになる。その結果、やはり溶 融の範囲及び深さ等が一定しない溶接部が形成されるという問題が生じる。その上、 小さなカップ状ヨーク 501内にやはり小さな板状ヨーク 504を圧入する作業は精密な制 御が必要であり、自動化が困難であるだけでなぐ面倒なために生産性が低い。 発明の開示  [0005] In the magnetic attachment 500 shown in FIG. 26, the seal plate 503 is press-fitted into the opening of the cup-shaped yoke 501, and there is no possibility that the seal plate 503 is inclined during the circular welding. When assembling the attachment 500, it is difficult to completely press the plate-shaped yoke 504 horizontally into the opening of the cup-shaped yoke 501, and usually, the pressed-in plate-shaped yoke 504 is slightly inclined and cup-shaped. It will be welded to the yoke 501. As a result, there arises a problem that a weld is formed in which the range and depth of melting are not constant. In addition, the operation of press-fitting the small plate-shaped yoke 504 into the small cup-shaped yoke 501 also requires precise control, which is difficult and difficult to automate, resulting in low productivity. Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0006] 従って本発明の目的は、カップ状ヨークの凹部が優れた溶接品質で密封され、磁 気吸着力が高ぐ耐食性が良好な義歯アタッチメントを提供することである。 [0006] Accordingly, an object of the present invention is to provide a denture attachment in which the recess of the cup-shaped yoke is sealed with excellent welding quality, has high magnetic attraction, and has good corrosion resistance.
[0007] 本発明のもう一つの目的は、力かる義歯アタッチメントを高い生産歩留まりで製造 する方法を提供することである。 [0007] Another object of the present invention is to provide a method for producing a strong denture attachment with a high production yield.
課題を解決するための手段  Means for solving the problem
[0008] 本発明の一実施形態による義歯アタッチメントは、永久磁石と、前記永久磁石を収 納する凹部を有する耐食性軟磁性材料からなるカップ状ヨークと、前記カップ状ョー クの凹部の開口部に嵌入されたシール板とを有し、前記シール板は、耐食性軟磁性 材料カゝらなる板状ヨークと、前記板状ヨークの外周に配設された耐食性非磁性材料 力もなるシールリングと力もなり、少なくとも前記カップ状ヨークと前記シールリングの 突き合わせ部を固定する複数箇所のスポット溶接部と、前記カップ状ヨークと前記シ ールリングの突き合わせ部及び前記シールリングと前記板状ヨークの突き合わせ部 を覆うように形成された少なくとも 1つの全周溶接部により、前記シール板が前記カツ プ状ヨークに接合され、もって前記永久磁石が封止されて 、ることを特徴とする。 [0008] The denture attachment according to one embodiment of the present invention includes a permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet, and an opening in the recess of the cup-shaped yoke. A sealing yoke which is fitted therein, wherein said sealing yoke has a plate-like yoke made of a corrosion-resistant soft magnetic material, and a seal ring which is provided on the outer periphery of said plate-like yoke and has a strong corrosion-resistant non-magnetic material. A plurality of spot-welded portions for fixing at least butted portions of the cup-shaped yoke and the seal ring; The sealing plate is joined to the cup-shaped yoke by at least one full-circumferential weld formed so as to cover the butted portion of the sealing ring and the butted portion of the seal ring and the plate-shaped yoke. It is characterized by being sealed.
[0009] 本発明の好ま 、実施形態による磁気アタッチメントは、永久磁石と、前記永久磁 石を収納するとともに開口端付近が拡径された凹部を有する耐食性軟磁性材料から なるカップ状ヨークと、前記カップ状ヨークの前記拡径部に嵌入されたシール板とを 有し、前記シール板は、耐食性軟磁性材料からなる板状ヨークと、前記板状ヨークの 外周に配設された耐食性非磁性材料カゝらなるシールリングとからなり、少なくとも前記 カップ状ヨークの前記拡径部と前記シールリングの突き合わせ部を固定する複数箇 所のスポット溶接部と、前記カップ状ヨークの前記拡径部と前記シールリングの突き 合わせ部及び前記シールリングと前記板状ヨークの突き合わせ部を覆うように形成さ れた少なくとも 1つの全周溶接部により、前記シール板が前記カップ状ヨークに接合さ れ、もって前記拡径部と前記永久磁石との間に磁気ギャップを設けた状態で前記永 久磁石が封止されている。実用上前記拡径部と前記凹部の段差は 20— 200 mであ るのが好ましい。  [0009] Preferably, the magnetic attachment according to the embodiment of the present invention includes a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a permanent magnet, a recess for storing the permanent magnet, and having an enlarged diameter near an open end. A sealing plate fitted to the enlarged diameter portion of the cup-shaped yoke, the sealing plate comprising a plate-shaped yoke made of a corrosion-resistant soft magnetic material, and a corrosion-resistant non-magnetic material provided on the outer periphery of the plate-shaped yoke A plurality of spot welds for fixing at least the enlarged portion of the cup-shaped yoke and the abutting portion of the seal ring; the enlarged portion of the cup-shaped yoke; The seal plate is formed by at least one full-peripheral weld formed to cover the butted portion of the seal ring and the butted portion of the seal ring and the plate-shaped yoke. Serial joined to the cup-shaped yoke, with in the permanent magnet in a state in which a magnetic gap between the permanent magnet and the enlarged diameter portion is sealed. Practically, the step between the enlarged diameter portion and the concave portion is preferably 20 to 200 m.
[0010] 本発明の別の実施形態による義歯アタッチメントは、永久磁石と、前記永久磁石を 収納する凹部を有する耐食性軟磁性材料からなるカップ状ヨークと、前記カップ状ョ 一クの凹部の開口部に嵌入されたシール板とを有し、前記シール板は、耐食性軟磁 性材料からなる板状ヨークと、前記板状ヨークの外周に配設された耐食性非磁性材 料力もなるシールリングとからなり、少なくとも前記カップ状ヨークと前記シールリング の突き合わせ部及び前記シールリングと前記板状ヨークの突き合わせ部を覆うように 形成された少なくとも 1つの全周溶接部により、前記シール板が前記カップ状ヨークに 接合され、もって前記永久磁石が封止されているとともに、前記カップ状ヨークの前 記開口端付近の領域は実質的に幅が変わることなく縮径していることを特徴とする。  [0010] A denture attachment according to another embodiment of the present invention includes a permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet, and an opening in the recess of the cup-shaped workpiece. A seal yoke made of a corrosion-resistant soft magnetic material, and a seal ring disposed on the outer periphery of the plate-like yoke and also having a corrosion-resistant non-magnetic material. The seal plate is attached to the cup-shaped yoke by at least one full-circle welded portion formed so as to cover at least the butted portion of the cup-shaped yoke and the seal ring and the butted portion of the seal ring and the plate-shaped yoke. The permanent magnet is sealed and the area near the opening end of the cup-shaped yoke is reduced without substantially changing its width. And characterized in that it.
[0011] 本発明のさらに別の実施形態による磁気アタッチメントは、永久磁石と、前記永久 磁石を収納するとともに開口端付近が拡径された凹部を有する耐食性軟磁性材料か らなるカップ状ヨークと、前記カップ状ヨークの前記拡径部に嵌入されたシール板とを 有し、前記シール板は、耐食性軟磁性材料からなる板状ヨークと、前記板状ヨークの 外周に配設された耐食性非磁性材料カゝらなるシールリングとからなり、前記カップ状 ヨークの前記拡径部と前記シールリングの突き合わせ部及び前記シールリングと前 記板状ヨークの突き合わせ部を覆うように形成された少なくとも 1つの全周溶接部によ り、前記シール板が前記カップ状ヨークに接合され、もって前記拡径部と前記永久磁 石との間に磁気ギャップを設けた状態で前記永久磁石が封止されているとともに、前 記カップ状ヨークの前記開口端付近の領域は実質的に幅が変わることなく縮径して いることを特徴とする。実用上前記拡径部と前記凹部の段差は 20— 200 mであるの が好ましい。 [0011] A magnetic attachment according to still another embodiment of the present invention includes a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a permanent magnet, a concave portion having an enlarged diameter near an open end for accommodating the permanent magnet, A sealing plate fitted into the enlarged diameter portion of the cup-shaped yoke, wherein the sealing plate is a plate-shaped yoke made of a corrosion-resistant soft magnetic material; A seal ring made of a corrosion-resistant non-magnetic material, which is disposed on the outer periphery; and a butt portion between the enlarged diameter portion of the cup-shaped yoke and the seal ring and a butt portion between the seal ring and the plate-like yoke. The seal plate is joined to the cup-shaped yoke by at least one full-circumferential weld formed so as to cover, so that a magnetic gap is provided between the enlarged diameter portion and the permanent magnet. The permanent magnet is sealed, and the diameter of the region near the opening end of the cup-shaped yoke is reduced without substantially changing its width. For practical purposes, the step between the enlarged diameter portion and the concave portion is preferably 20 to 200 m.
[0012] 前記スポット溶接部は、 (a)前記カップ状ヨークと前記シールリングの突き合わせ部 のみか、 (b)前記カップ状ヨークと前記シールリングの突き合わせ部と、前記シールリ ングと前記板状ヨークの突き合わせ部との両方に形成されているのが好ましい。前記 スポット溶接部はほぼ等間隔であるのが好ま 、。  [0012] The spot welded portion may be (a) a butt portion between the cup-shaped yoke and the seal ring, or (b) a butt portion between the cup-shaped yoke and the seal ring, and the seal ring and the plate-shaped yoke. Is preferably formed on both the butted portions. Preferably, the spot welds are substantially equally spaced.
[0013] 前記全周溶接部は、 (a)前記カップ状ヨークと前記シールリングの突き合わせ部を 全周に亘つて覆うように形成された第一の溶接部と、前記シールリングと前記板状ョ ークの突き合わせ部を全周に亘つて覆うように形成された第二の溶接部とからなるか 、 (b)前記カップ状ヨークと前記シールリングの突き合わせ部と、前記シールリングと 前記板状ヨークの突き合わせ部とを全周に亘つて覆う一体的溶接部であるのが好ま しい。  [0013] The full-circumferential welded portion includes: (a) a first welded portion formed so as to cover a butt portion between the cup-shaped yoke and the seal ring over the entire perimeter; Or (b) a butted portion of the cup-shaped yoke and the seal ring, the seal ring, and the plate. It is preferably an integral weld covering the butted portion of the yoke over the entire circumference.
[0014] 前記シール板及び前記カップ状ヨークの表面は全周溶接後に平面カ卩ェされている のが好ましい。  [0014] It is preferable that the surfaces of the seal plate and the cup-shaped yoke are flat-plated after the entire circumference is welded.
[0015] 本発明の義歯アタッチメントの製造方法は、耐食性軟磁性材カもなるカップ状ョー クの凹部に、永久磁石を収納し、耐食性軟磁性材の板状ヨークとその外周に配設し た耐食性非磁性材のシールリングとからなるシール板を前記カップ状ヨークの開口部 に嵌入し、少なくとも前記カップ状ヨークと前記シールリングの突き合わせ部を複数箇 所でスポット溶接し、前記カップ状ヨークと前記シールリングの突き合わせ部及び前 記シールリングと前記板状ヨークの突き合わせ部を覆うように前記カップ状ヨークと前 記シール板を全周溶接することを特徴とする。  [0015] In the method for manufacturing a denture attachment of the present invention, a permanent magnet is housed in a recess of a cup-shaped yoke that also has a corrosion-resistant soft magnetic material, and is disposed on a plate-shaped yoke of the corrosion-resistant soft magnetic material and its outer periphery. A seal plate comprising a seal ring made of a corrosion-resistant non-magnetic material is fitted into the opening of the cup-shaped yoke, and at least a butt portion of the cup-shaped yoke and the seal ring is spot-welded at a plurality of places to form the cup-shaped yoke. The cup-shaped yoke and the seal plate are welded all around so as to cover the butted portion of the seal ring and the butted portion of the seal ring and the plate-shaped yoke.
[0016] (a)前記カップ状ヨークと前記シールリングの突き合わせ部のみを固定する力、 (b) 前記カップ状ヨークと前記シールリングの突き合わせ部と、前記シールリングと前記板 状ヨークの突き合わせ部とを一度に固定するように、前記スポット溶接を複数箇所で 行なうのが好ましい。 (A) a force for fixing only the butted portion of the cup-shaped yoke and the seal ring, (b) It is preferable that the spot welding is performed at a plurality of locations so that the butted portion of the cup-shaped yoke and the seal ring and the butted portion of the seal ring and the plate-shaped yoke are fixed at a time.
[0017] (a)前記カップ状ヨークと前記シールリングの突き合わせ部を全周に亘つて覆う第一 の溶接部と、前記シールリングと前記板状ヨークの突き合わせ部を全周に亘つて覆う 第二の溶接部とを形成するか、 (b)前記カップ状ヨークと前記シールリングの突き合わ せ部と、前記シールリングと前記板状ヨークの突き合わせ部とを全周に亘つて一体的 に覆うように、前記全周溶接を行うのが好ましい。  (A) A first welded portion covering the butted portion of the cup-shaped yoke and the seal ring over the entire circumference, and a first welded portion covering the butted portion of the seal ring and the plate-shaped yoke over the entire circumference. Or (b) integrally covering the butted portion between the cup-shaped yoke and the seal ring and the butted portion between the seal ring and the plate-shaped yoke. As described above, it is preferable to perform the full circumference welding.
[0018] 全周溶接後に、前記シール板及び前記カップ状ヨークを平面加工するのが好まし い。  [0018] After the entire circumference welding, it is preferable that the seal plate and the cup-shaped yoke are processed in a plane.
発明の効果  The invention's effect
[0019] 本発明によれば、シール板をカップ状ヨークの凹部の開口部にゆるく嵌入し、スポッ ト溶接によりシール板とカップ状ヨークを仮止め後に全周溶接を行っているので、シ 一ル板は表面が傾くことなくカップ状ヨーク表面とほぼ平行に溶接され、カップ状ョー クとシール板の溶接部は、溶融部形状、溶融量、融け込み深さが全周に亘つてほぼ 均一な安定した品質になる。従って、溶接面を平面加工した後に溶接部が局部的に 浅くなつたり、貫通孔が生じたりして密封性が低下することはない。そのため、本発明 の義歯アタッチメントは、カップ状ヨークの開口端付近の領域が縮径した外観を呈し、 磁気吸着力が高ぐ耐食性が良好で耐久性に富み、安価に小型化かつ薄型化する ことができる。  According to the present invention, since the seal plate is loosely fitted into the opening of the concave portion of the cup-shaped yoke, and the seal plate and the cup-shaped yoke are temporarily fixed by spot welding and then the entire circumference is welded. The plate is welded almost parallel to the surface of the cup-shaped yoke without tilting, and the welded portion of the cup-shaped yoke and the seal plate has a substantially uniform shape, melting amount and melting depth over the entire circumference. And stable quality. Therefore, there is no possibility that the welded portion becomes locally shallow or a through hole is formed after the welding surface is flattened, and the sealing performance is not deteriorated. Therefore, the denture attachment of the present invention has a reduced diameter in the area near the opening end of the cup-shaped yoke, has high magnetic attraction, has good corrosion resistance, is durable, is inexpensive, and can be reduced in size and thickness. Can be.
図面の簡単な説明  Brief Description of Drawings
[0020] [図 1(a)]本発明の第一の実施形態による義歯アタッチメントを示す平面図である。  FIG. 1 (a) is a plan view showing a denture attachment according to a first embodiment of the present invention.
[図 1(b)]図 1(a)の義歯アタッチメントの全周溶接前の状態を示す断面図である。  FIG. 1 (b) is a cross-sectional view showing a state before welding the entire circumference of the denture attachment of FIG. 1 (a).
[図 1(c)]図 1(a)の義歯アタッチメントの全周溶接後の状態を示す断面図である。  FIG. 1 (c) is a cross-sectional view showing a state of the denture attachment of FIG. 1 (a) after full-circumference welding.
[図 1(d)]図 1(a)の A-0- A断面図(実施例 1の義歯アタッチメントの平面加工後の状態 を示す)である。  FIG. 1 (d) is a cross-sectional view taken along the line A-0-A of FIG. 1 (a) (showing a state of the denture attachment of Example 1 after planar processing).
[図 2]図 1(a)の義歯アタッチメントを製造する工程を示す概略図 (右側の各図は左側 の図の A- 0-A断面を示す)である。 [図 3(a)]図 1(a)の義歯アタッチメントの溶接面で、平面加工前の状態を示す平面図で ある。 FIG. 2 is a schematic view showing a step of manufacturing the denture attachment of FIG. 1 (a) (each figure on the right shows a section taken along line A-0-A of the figure on the left). FIG. 3 (a) is a plan view showing a welding surface of the denture attachment of FIG. 1 (a) before planar processing.
[図 3(b)]図 3(a)における A-0-A断面図である。  FIG. 3 (b) is a sectional view taken along line A-0-A in FIG. 3 (a).
圆 4(a)]本発明の第二の実施形態による義歯アタッチメントを示す平面図である。 FIG. 4 (a)] is a plan view showing a denture attachment according to a second embodiment of the present invention.
[図 4(b)]図 4(a)の B-0-B断面図である。 FIG. 4 (b) is a sectional view taken along line B-0-B of FIG. 4 (a).
圆 5]図 4(a)の義歯アタッチメントを製造する工程を示す概略図 (右側の各図は左側 の図の B- 0- B断面を示す)である。 圆 5] is a schematic view showing a step of manufacturing the denture attachment of FIG. 4 (a) (each figure on the right shows a cross section B-0-B in the figure on the left).
圆 6(a)]本発明の第三の実施形態による義歯アタッチメントを示す平面図である。 FIG. 6 (a)] is a plan view showing a denture attachment according to a third embodiment of the present invention.
[図 6(b)]図 6(a)の C-0-C断面図である。 FIG. 6 (b) is a sectional view taken along line C-0-C of FIG. 6 (a).
圆 7]図 6(a)の義歯アタッチメントを製造する工程を示す概略図 (右側の各図は左側 の図の C- 0- C断面を示す)である。 [7] FIG. 6 (a) is a schematic view showing a step of manufacturing the denture attachment of FIG. 6 (a) (each figure on the right shows a cross section C-0-C of the figure on the left).
圆 8(a)]本発明の第四の実施形態による義歯アタッチメントを示す平面図である。 FIG. 8 (a)] is a plan view showing a denture attachment according to a fourth embodiment of the present invention.
[図 8(b)]図 8(a)の D-0-D断面図である。 FIG. 8 (b) is a sectional view taken along the line D-0-D of FIG. 8 (a).
圆 9(a)]本発明の第五の実施形態による義歯アタッチメントを示す平面図である。 FIG. 9 (a)] is a plan view showing a denture attachment according to a fifth embodiment of the present invention.
[図 9(b)]図 9(a)の E-0-E断面図である。 FIG. 9 (b) is a sectional view taken along line E-0-E of FIG. 9 (a).
圆 10]本発明の第六の実施形態による義歯アタッチメントを示す断面図である。 圆 11(a)]本発明の第七の実施形態による義歯アタッチメントの左側溶接部付近の平 面加工後の断面を部分的に示す写真である。 [10] Fig. 10 is a sectional view showing a denture attachment according to a sixth embodiment of the present invention. FIG. 11 (a) is a photograph partially showing a cross section of the vicinity of a left welded portion of a denture attachment according to a seventh embodiment of the present invention after a flat surface processing.
圆 11(b)]図 11(a)の義歯アタッチメントの右側溶接部付近の平面加工後の断面を部 分的に示す写真である。 FIG. 11 (b)] is a photograph partially showing a cross section of the vicinity of the right welded portion of the denture attachment of FIG. 11 (a) after flattening.
[図 12(a)]図 11(a)に対応する線図である。  FIG. 12 (a) is a diagram corresponding to FIG. 11 (a).
[図 12(b)]図 11(b)に対応する線図である。  FIG. 12 (b) is a diagram corresponding to FIG. 11 (b).
[図 12(c)]図 11(a)の義歯アタッチメントの平面加工後の全体構造を示す断面図である  FIG. 12 (c) is a cross-sectional view showing the entire structure of the denture attachment of FIG. 11 (a) after plane machining.
[図 13(a)]実施例 3の義歯アタッチメントの左側溶接部付近の溶接したままの断面を部 分的に示す写真である。 FIG. 13 (a) is a photograph partially showing an as-welded cross section near the left welded part of the denture attachment of Example 3.
[図 13(b)]実施例 3の義歯アタッチメントの右側溶接部付近の溶接したままの断面を部 分的に示す写真である。 [図 14(a)]図 13(a)に対応する線図である。 FIG. 13 (b) is a photograph partially showing an as-welded cross section near the right welded portion of the denture attachment of Example 3. FIG. 14 (a) is a diagram corresponding to FIG. 13 (a).
[図 14(b)]図 13(b)に対応する線図である。  FIG. 14 (b) is a diagram corresponding to FIG. 13 (b).
[図 14(c)]図 13(a)の義歯アタッチメントの溶接したままの状態の全体構造を示す断面 図である。  FIG. 14 (c) is a cross-sectional view showing the entire structure of the denture attachment of FIG. 13 (a) in an as-welded state.
[図 15]スポット溶接部なしにカップ状ヨークとシール板を全周溶接したときのシール板 の傾斜を示す概略断面図である。  FIG. 15 is a schematic sectional view showing the inclination of the seal plate when the cup-shaped yoke and the seal plate are welded all around without a spot weld.
[図 16]カップ状ヨークの開口部にシール板を圧入した後カップ状ヨークとシール板を 全周溶接してなる義歯アタッチメントを示す部分断面斜視図である。  FIG. 16 is a partial cross-sectional perspective view showing a denture attachment obtained by pressing a seal plate into an opening of a cup-shaped yoke and then welding the cup-shaped yoke and the seal plate all around.
[図 17]比較例 3の義歯アタッチメントの一サンプルを示す平面図である。  FIG. 17 is a plan view showing one sample of a denture attachment of Comparative Example 3.
[図 18]比較例 3の義歯アタッチメントの他のサンプルを示す平面図である。  FIG. 18 is a plan view showing another sample of the denture attachment of Comparative Example 3.
[図 19]図 18の領域 Aの拡大図である。  FIG. 19 is an enlarged view of a region A in FIG. 18.
[図 20]図 19に対応する顕微鏡写真である。  FIG. 20 is a micrograph corresponding to FIG.
[図 21]比較例 5の義歯アタッチメントのシール板の嵌入部を示す顕微鏡写真である。  FIG. 21 is a micrograph showing a fitting portion of a seal plate of a denture attachment of Comparative Example 5.
[図 22]図 21の顕微鏡写真に対応する概略図である。  FIG. 22 is a schematic diagram corresponding to the micrograph of FIG. 21.
[図 23]義歯アタッチメントの磁気吸引力を測定する装置を示す概略図である。  FIG. 23 is a schematic view showing an apparatus for measuring a magnetic attraction force of a denture attachment.
[図 24]義歯アタッチメントを有する義歯を歯槽に埋設された根面板に設置されたキー パに装着した状態を示す概略断面図である。  FIG. 24 is a schematic cross-sectional view showing a state in which a denture having a denture attachment is mounted on a keeper installed on a root plate embedded in an alveolar cavity.
[図 25]従来の義歯アタッチメントを示す概略断面図である。  FIG. 25 is a schematic sectional view showing a conventional denture attachment.
[図 26]従来の義歯アタッチメントを示す概略断面図である。  FIG. 26 is a schematic sectional view showing a conventional denture attachment.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0021] 本発明の義歯アタッチメントを添付図面を参照して以下詳細に説明するが、一桁目 の数字が同じ参照番号を有する部位は基本的に各実施形態に共通するものである ので、最初の実施形態の説明だけに止め、以降の実施形態では詳細な説明を省略 する。 [0021] The denture attachment of the present invention will be described in detail below with reference to the accompanying drawings. However, since a part having the same reference numeral in the first digit is basically common to each embodiment, first, Only the description of the first embodiment will be given, and detailed description will be omitted in the following embodiments.
[0022] 図 1及び 2は、本発明の第一の実施形態による義歯アタッチメントを示す。この義歯 アタッチメントは、基本構造が図 25のものと同じであり、円形断面の凹部が形成された 軟磁性材料力もなるカップ状ヨーク 1と、それに収納される永久磁石 2と、凹部 1 'の開 口部に嵌入されたシール板 3とカゝらなる。シール板 3は、永久磁石 2を凹部 1 '内に封 止するとともに、磁気回路を形成する部材であり、軟磁性材料からなる円形の板状ョ ーク 4と、その外周に装着された同一幅の非磁性材料カゝらなるシールリング 5で構成さ れている。なおカップ状ヨーク 1及びシール板 3の外形は円形に限らず、楕円形でも 四角形等の多角形でも良 、。 FIGS. 1 and 2 show a denture attachment according to a first embodiment of the present invention. This denture attachment has the same basic structure as that shown in FIG. 25, and has a cup-shaped yoke 1 having a circular cross section formed with a soft magnetic material, also having a permanent magnet 2 housed therein, and an opening of a recess 1 ′. It consists of a seal plate 3 fitted in the mouth. Seal plate 3 seals permanent magnet 2 in recess 1 '. And a member forming a magnetic circuit, and is composed of a circular plate-shaped yoke 4 made of a soft magnetic material and a seal ring 5 made of a non-magnetic material having the same width and mounted on the outer periphery thereof. Have been. The outer shapes of the cup-shaped yoke 1 and the seal plate 3 are not limited to circular shapes, but may be elliptical shapes or polygonal shapes such as squares.
[0023] 本発明では、カップ状ヨーク及び板状ヨークには耐食性軟磁性ステンレス鋼 (例え ば SUS447J1、 SUSXM27, SUS444等)を用いるのが好ましい。またシールリングには耐 食性非磁性ステンレス鋼 (例えば SUS316L)を用いるのが好ま 、。  In the present invention, it is preferable to use corrosion-resistant soft magnetic stainless steel (for example, SUS447J1, SUSXM27, SUS444, etc.) for the cup-shaped yoke and the plate-shaped yoke. Further, it is preferable to use a corrosion-resistant non-magnetic stainless steel (for example, SUS316L) for the seal ring.
[0024] 義歯アタッチメントの組立効率を上げるために、シール板 3は、板状ヨーク 4となるベ き軟磁性材料の丸棒にシールリング 5となるべき非磁性材料の円筒材を嵌め、引抜き 加工したものを所定厚さにスライスすることにより形成するのが好ましい。スライスによ り得たシール板に還元性雰囲気中で 600— 880°Cで 0.5— 10時間、好ましくは 700— 850°Cで 1一 8時間熱処理を行い、室温まで冷却する。熱処理条件が 600°C X 0.5時間 未満では板状ヨーク 4とシールリング 5との間に全く接合が起こらず、また 880°C X 0.5 時間超の熱処理では板状ヨーク 4とシールリング 5との界面が融合し、後述の比較例 3 に示すように得られる義歯アタッチメントの磁気吸引力が低い。前記熱処理により、板 状ヨーク 4となるべき円板体とシールリング 5となるべき円筒材が弱く(軽く)接合される 。用語「弱い (軽い)接合」は、円板体と円筒材の接合界面における溶融部の面積率 が 10%以下、特に 5%以下であることを意味する。なお、前記条件の熱処理をスライ ス前にしても良い。  [0024] In order to increase the assembling efficiency of the denture attachment, the sealing plate 3 is formed by fitting a cylindrical member of a non-magnetic material to be a seal ring 5 to a round bar of a soft magnetic material to be a plate-shaped yoke 4, and performing drawing. It is preferable to form the resulting material by slicing it to a predetermined thickness. The seal plate obtained by slicing is heat-treated in a reducing atmosphere at 600-880 ° C for 0.5-10 hours, preferably at 700-850 ° C for 18 hours, and cooled to room temperature. If the heat treatment condition is less than 600 ° C for 0.5 hour, no bonding occurs between the plate yoke 4 and the seal ring 5, and if the heat treatment exceeds 880 ° C for 0.5 hour, the interface between the plate yoke 4 and the seal ring 5 The denture attachment obtained by fusion and as shown in Comparative Example 3 described below has a low magnetic attraction force. The heat treatment weakly (lightly) joins the disc to be the plate yoke 4 and the cylindrical material to be the seal ring 5. The term “weak (light) joint” means that the area ratio of the fusion zone at the joint interface between the disk and the cylinder is less than 10%, especially less than 5%. The heat treatment under the above conditions may be performed before slicing.
[0025] シール板 3とカップ状ヨーク 1とは別個に製造するので、必然的に嵌め合い寸法に バラツキがでる。そこで従来の義歯アタッチメントのようにシール板 3をカップ状ヨーク 1 に圧入する代わりに、シール板 3の外径をカップ状ヨーク 1の内径より僅かに小さく設 定すると、シール板 3をカップ状ヨーク 1の開口部に容易に嵌入できるので好ましい。 溶接による密封を確実にするために、シール板 3とカップ状ヨーク 1との隙間 Xは 10— 60 mにするのが好ましい。図 1(b)に示すように、隙間 Xは (カップ状ヨーク 1の内径) - (シール板 3の外径)である。  [0025] Since the seal plate 3 and the cup-shaped yoke 1 are manufactured separately, the fitting dimensions inevitably vary. Therefore, instead of press-fitting the seal plate 3 into the cup-shaped yoke 1 as in the conventional denture attachment, if the outer diameter of the seal plate 3 is set slightly smaller than the inner diameter of the cup-shaped yoke 1, the seal plate 3 is moved to the cup-shaped yoke. This is preferable because it can be easily fitted into the opening. The gap X between the sealing plate 3 and the cup-shaped yoke 1 is preferably set to 10 to 60 m in order to ensure sealing by welding. As shown in FIG. 1B, the gap X is (the inner diameter of the cup-shaped yoke 1) − (the outer diameter of the sealing plate 3).
[0026] 図 1(b)〖こ示すように、シール板 3は、カップ状ヨーク 1の凹部 1 'に収納された永久磁 石 2の上面に密着するように凹部 1 'に嵌入される。そのとき、シール板 3の上面はカツ プ状ヨーク 1の上面とほぼ一致する。シール板 3とカップ状ヨーク 1はレーザ又は電子 ビームで溶接され、内部の永久磁石 2はヨーク内に密封され外部と封止されている。 溶接部は、シール板 3とカップ状ヨーク 1の突き合わせ部を覆うように複数箇所設けら れたスポット溶接部 6と、カップ状ヨーク 1とシールリング 5の突き合わせ部及びシールリ ング 5と板状ヨーク 4の突き合わせ部を覆うように形成された全周溶接部 7と力もなる。 As shown in FIG. 1B, the seal plate 3 is fitted into the recess 1 ′ so as to be in close contact with the upper surface of the permanent magnet 2 housed in the recess 1 ′ of the cup-shaped yoke 1. At this time, the top of the seal plate 3 It almost coincides with the upper surface of the yoke 1. The sealing plate 3 and the cup-shaped yoke 1 are welded by a laser or an electron beam, and the permanent magnet 2 inside is sealed in the yoke and sealed from the outside. The welded portion is a spot welded portion 6 provided at a plurality of locations so as to cover the butted portion of the seal plate 3 and the cup-shaped yoke 1, the butted portion of the cup-shaped yoke 1 and the seal ring 5, and the seal ring 5 and the plate-shaped yoke. 4 and the entire circumference weld 7 formed to cover the butted portion.
[0027] スポット溶接部 6は、レーザ光をスポット的に照射することにより溶融凝固させた (溶 接した)部分である。この際レーザ光は僅かであれば移動させても良い。第一の実施 形態では、レーザスポット径はシールリング 5を挟むカップ状ヨーク 1及び板状ヨーク 4 の一部をカバーしている。そのため、スポット溶接部 6により、板状ヨーク 4はカップ状ョ ーク 1に一体的に固定される。しかしこれは必須要件ではなぐシールリング 5と板状ョ ーク 4とが引き抜き加工で強固に固定されている場合、少なくともカップ状ヨーク 1とシ ールリング 5の突き合わせ部がスポット溶接部 6により固定されていれば良い。スポット 溶接部 6はシール板 3の中心軸に対してほぼ等間隔に(点対称に)複数箇所 (例えば 2— 8箇所)設けられているのが好ましい。図示の例では、スポット溶接部 6は 4個のス ポット溶接部 6a— 6dからなる。  [0027] The spot welded portion 6 is a portion that has been melt-solidified (welded) by irradiating a laser beam in a spot manner. At this time, the laser light may be moved if it is slight. In the first embodiment, the laser spot diameter covers a part of the cup-shaped yoke 1 and the plate-shaped yoke 4 sandwiching the seal ring 5. Therefore, the plate-shaped yoke 4 is integrally fixed to the cup-shaped yoke 1 by the spot welds 6. However, this is not an essential requirement.When the seal ring 5 and the plate-shaped yoke 4 are firmly fixed by drawing, at least the butted portion of the cup-shaped yoke 1 and the seal ring 5 is fixed by the spot weld 6. It would be fine. It is preferable that the spot welds 6 are provided at a plurality of locations (eg, 2 to 8 locations) at substantially equal intervals (symmetrically with respect to the point) with respect to the center axis of the seal plate 3. In the illustrated example, the spot welds 6 include four spot welds 6a-6d.
[0028] 本実施形態では、図 1(c)に示すように、全周溶接部 7は、カップ状ヨーク 1とシールリ ング 5の突き合わせ部と、シールリング 5と板状ヨーク 4の突き合わせ部とを全周に亘っ て一体的に覆うように形成されている。一体的な全周溶接部 7は、シールリング 5の幅 が例えばスポット径の 1Z2以下のように狭い場合に好適である。この一体的な全周溶 接部 7は、シールリング 5を挟んでカップ状ヨーク 1と板状ヨーク 4に同時にレーザ光を 照射することにより形成される。  In the present embodiment, as shown in FIG. 1 (c), the entire circumference welded portion 7 is formed by a butt portion between the cup-shaped yoke 1 and the seal ring 5, and a butt portion between the seal ring 5 and the plate-shaped yoke 4. Is integrally formed over the entire circumference. The integral perimeter weld 7 is suitable when the width of the seal ring 5 is narrow, for example, 1Z2 or less of the spot diameter. The integrated all-circumferential welded portion 7 is formed by simultaneously irradiating the cup-shaped yoke 1 and the plate-shaped yoke 4 with laser light with the seal ring 5 interposed therebetween.
[0029] カップ状ヨーク 1は凹部 1'の底面付近から開口端付近まで同じ幅 wを有する。図 1(c) に示す全周溶接後の義歯アタッチメントでは、カップ状ヨーク 1の凹部 1'の底面付近 の外径 Dobに対して凹部 1 'の開口端付近の外径 Dou'が縮小して!/、る(Dob > Dou')。 なお図 1(d)に示すように、平面加工後は、外径 Douは Douになる。  [0029] The cup-shaped yoke 1 has the same width w from near the bottom surface of the concave portion 1 'to near the open end. In the denture attachment after full circumference welding shown in Fig. 1 (c), the outer diameter Dou 'near the opening end of the recess 1' is smaller than the outer diameter Dob near the bottom of the recess 1 'of the cup-shaped yoke 1. ! / Ru (Dob> Dou '). As shown in Fig. 1 (d), the outer diameter Dou becomes Dou after plane processing.
[0030] 開口端付近の外径が縮小する現象は以下の理由により生じると考えられる。スポッ ト溶接による仮止めでカップ状ヨーク 1とシールリング 5を固定した時点ではカップ状ョ ーク 1の凹部開口端近傍の外径は縮小していない。これは、スポット溶接部 6a— 6dが 溶融後凝固する時点で溶接部に縮もうとする力が発生するが、スポット溶接部 6a— 6d の体積が小さいので、カップ状ヨーク 1を引き寄せるには至らないからである。全周溶 接を開始すると、溶融された突き合わせ部 (溶接部)は凝固して縮もうとするので、力 ップ状ヨーク 1とシールリング 5を溶接部に引っ張る力が働く。このとき、シールリング 5 は、カップ状ヨーク 1の溶融されて 、な 、側にスポット溶接部を介して固定されて 、る ので、溶接部に引っ張られても変形することはない。他方、カップ状ヨーク 1は外周を 固定されていないので溶接部に引っ張られ、少しずつ変形していく。レーザ照射の 位置を周方向にずらしながら全周溶接を行っていくと、カップ状ヨーク 1の開口端近 傍は溶接部側に少しずつ引き寄せられていき、全周を溶接した段階でほぼ均一に縮 小すること〖こなる。なお、スポット溶接による仮止めを行わないで全周溶接を行うと、 固定されていないシールリングは溶接部に強く引き寄せられ、シール板が大きく浮き 上がる。 [0030] The phenomenon that the outer diameter near the opening end is reduced is considered to occur for the following reason. When the cup-shaped yoke 1 and the seal ring 5 are fixed by spot welding by spot welding, the outer diameter of the cup-shaped yoke 1 near the opening end of the concave portion has not been reduced. This is because spot welds 6a-6d At the time of solidification after melting, a force for shrinking is generated in the welded portion. However, since the volume of the spot welded portions 6a-6d is small, the cup-shaped yoke 1 cannot be pulled. When all-around welding is started, the melted butted portion (welded portion) solidifies and shrinks, so that a force acts to pull the gap-shaped yoke 1 and the seal ring 5 toward the welded portion. At this time, since the seal ring 5 is melted and fixed to the side of the cup-shaped yoke 1 via the spot welded portion, the seal ring 5 does not deform even when pulled by the welded portion. On the other hand, since the outer periphery of the cup-shaped yoke 1 is not fixed, the cup-shaped yoke 1 is pulled by the welded portion and gradually deforms. As the laser irradiation position is shifted in the circumferential direction and the entire circumference is welded, the vicinity of the opening end of the cup-shaped yoke 1 is gradually pulled toward the welded side, and almost uniformly when the entire circumference is welded. To shrink If the entire circumference is welded without temporary fixing by spot welding, the unfixed seal ring will be strongly attracted to the weld and the seal plate will rise greatly.
[0031] 図 1(d)に示すように、シール板 3とカップ状ヨーク 1の溶接面は研磨等により平面カロ ェされている。平面加工により溶接部の局部的な凹凸は除去され、平滑な面 9が形 成される。義歯アタッチメントの平滑面 9は歯槽に埋設した根面板と良く密接するので 、磁束の乱れがない。その結果、本発明の義歯アタッチメントを装着した義歯は歯槽 に強固に保持される。  [0031] As shown in FIG. 1 (d), the welding surface of the seal plate 3 and the cup-shaped yoke 1 is flattened by polishing or the like. By the planar processing, the local unevenness of the welded portion is removed, and a smooth surface 9 is formed. Since the smooth surface 9 of the denture attachment is in good contact with the root plate embedded in the alveolar cavity, there is no magnetic flux disturbance. As a result, the denture fitted with the denture attachment of the present invention is firmly held in the alveolar cavity.
[0032] 図 2は図 1(a)の義歯アタッチメントの製造工程を示す。まず軟磁性カップ状ヨーク 1の 円形断面の凹部 1 'に永久磁石 2を収納し、凹部 1 'の開口部にシール板 3を嵌入する 。傾斜した押え部材 3aの先端部をシール板 3のほぼ中央に当て、シール板 3を固定 する [工程 (a)]。この状態で、カップ状ヨーク 1とシールリング 5の突き合わせ部 laと、シ ールリング 5と板状ヨーク 4の突き合わせ部 4aとを覆うように、複数箇所のスポット溶接 を 6a→6b→6c→6dの順に行う [工程 (b)]。レーザ照射装置 3bを用いて、このように対 角線上の点 6a→6b→6c→6dの順序でスポット溶接することにより、溶融金属が冷却 凝固する時にシール板 3が受ける収縮力を小さぐかつバランスさせることができ、も つて従来技術のようなシール板 3の浮き上がりを防止することができる。得られたスポ ット溶接部 6a— 6dにより、シール板 3はカップ状ヨーク 1に強固に固定される。  FIG. 2 shows a manufacturing process of the denture attachment of FIG. 1 (a). First, the permanent magnet 2 is housed in the recess 1 ′ having a circular cross section of the soft magnetic cup-shaped yoke 1, and the seal plate 3 is fitted into the opening of the recess 1 ′. The tip of the inclined holding member 3a is placed almost at the center of the seal plate 3, and the seal plate 3 is fixed [step (a)]. In this state, spot welding at a plurality of locations 6a → 6b → 6c → 6d is performed so as to cover the butted portion la of the cup-shaped yoke 1 and the seal ring 5 and the butted portion 4a of the seal ring 5 and the plate-shaped yoke 4. [Step (b)] is performed in order. By performing spot welding in the order of the diagonal points 6a → 6b → 6c → 6d using the laser irradiation device 3b in this manner, the shrinkage force applied to the seal plate 3 when the molten metal is cooled and solidified is reduced and The balance can be achieved, and the floating of the seal plate 3 as in the prior art can be prevented. The seal plate 3 is firmly fixed to the cup-shaped yoke 1 by the obtained spot welds 6a to 6d.
[0033] シール板 3として、引抜き加工で板状ヨーク 4とシールリング 5を一体ィ匕した後、熱処 理等により接合部を融着させてなるものを使用する場合、スポット溶接は、シールリン グ 5とカップ状ヨーク 1との突き合わせ部 laにだけ行っても良い。 [0033] As the seal plate 3, after the plate yoke 4 and the seal ring 5 are integrally formed by drawing, the heat treatment is performed. In the case of using a material obtained by fusing the joints by a process or the like, spot welding may be performed only on the butted portion la of the seal ring 5 and the cup-shaped yoke 1.
[0034] 押え部材 3aを取り除いた後 [工程 (c)]、カップ状ヨーク 1とシールリング 5の突き合わ せ部 laと、シールリング 5と板状ヨーク 4の突き合わせ部 4aとを覆うスポット径のレーザ 光を連続的又は断続的に照射し、全周溶接部 7を形成する [工程 (d)]。シール板 3は カップ状ヨーク 1にほぼ等間隔で固定されているので、全周溶接の際シール板 3がず れることなぐ安定した溶接条件で均一な全周溶接部 7を得ることができる。溶融部形 状、溶融量、融け込み深さが全周に亘つてほぼ均一な溶接ビードにより、カップ状ョ ーク 1の開口部は完全に密封され、永久磁石 2は外部力も気密に遮断される。全周溶 接用レーザ光をスポット溶接用レーザ光と同じスポット径とするのが好ましい。図 3(a) は全周溶接後のカップ状ヨーク 1及びシール板 3の表面状態を示し、図 3(b)はその断 面を示す。この例ではスポット溶接部 6a— 6dは全周溶接部 7〖こ隠されるが、符号 7'の スポットは全周溶接部の末端である。  After removing the pressing member 3a [Step (c)], the spot diameter covering the butted portion la of the cup-shaped yoke 1 and the seal ring 5 and the butted portion 4a of the seal ring 5 and the plate-shaped yoke 4 The laser beam is continuously or intermittently irradiated to form the entire circumferential weld 7 [step (d)]. Since the seal plates 3 are fixed to the cup-shaped yoke 1 at substantially equal intervals, a uniform full-circle weld 7 can be obtained under stable welding conditions such that the seal plates 3 do not shift during full-circle welding. The opening of the cup-shaped yoke 1 is completely sealed, and the external force of the permanent magnet 2 is also hermetically shut off by a weld bead with a substantially uniform shape, melting amount and melting depth over the entire circumference. You. It is preferable that the laser beam for all-around welding has the same spot diameter as the laser beam for spot welding. FIG. 3 (a) shows the surface condition of the cup-shaped yoke 1 and the seal plate 3 after the entire circumference welding, and FIG. 3 (b) shows the cross-section. In this example, the spot welds 6a to 6d are concealed by the entire circumference weld 7 but the spot denoted by reference numeral 7 'is the end of the full circumference weld.
[0035] 溶接が完了したカップ状ヨーク 1を平面研磨機にセットし、カップ状ヨーク 1及びシー ル板 3の溶接面を所定の深さ δに平面加工 (研磨)する [工程 (e)]。切り込み深さ δは 、カップ状ヨーク 1とシール板 3が同一高さになるとともに、全周溶接部 7の凹凸が残ら ないように、 10 iu m—100 iu m程度、好ましくは40 iu m—60 iu mとするのがょぃ。 δが 10 μ m未満では表面に凹凸が残る。、一方 δが 100 /z m超では、溶接部の体積が過小 になり溶接強度が低下してしまう。シール板 3は傾くことなくカップ状ヨーク 1にほぼ平 行に溶接されるので、平面加工後も溶融部形状、溶融量及び融け込み深さは全周 に亘つてほぼ均一であり、溶融部が局部的に浅くなつたり貫通孔が生じたりして密封 '性が低下することはない。 [0035] The cup-shaped yoke 1 on which welding has been completed is set on a plane polishing machine, and the welded surfaces of the cup-shaped yoke 1 and the seal plate 3 are flat-worked (polished) to a predetermined depth δ (step (e)). . The depth of cut δ is about 10 i um—about 100 i um, preferably 40 i um—, so that the cup-shaped yoke 1 and the seal plate 3 are at the same height and the unevenness of the entire weld 7 is not left. It should be 60 i um. If δ is less than 10 μm, irregularities remain on the surface. On the other hand, if δ exceeds 100 / zm, the volume of the welded portion becomes too small, and the weld strength decreases. Since the sealing plate 3 is welded almost parallel to the cup-shaped yoke 1 without tilting, the shape of the molten portion, the amount of fusion and the depth of fusion are substantially uniform over the entire circumference even after the flat surface processing, and the molten portion is There is no reduction in sealing performance due to local shallowness or through holes.
[0036] 溶接部の非磁性相(オーステナイト相)を安定ィ匕するとともに、磁気アタッチメントに 組み込んだ永久磁石の機械的な歪等により劣化した磁力を回復させる目的で、平面 加工後に熱処理を行うのが好ましい。この熱処理は、不活性ガス雰囲気中で、 600— 1100°C X 0.5— 10時間、好ましくは 700— 900°C X I— 5時間加熱後、室温まで冷却す る条件が好ま 、。熱処理条件が 600°C X 0.5時間未満では熱処理の効果が不十分 であり、また 1100°C X 10時間超では永久磁石の結晶粒の粗大化や再焼結により磁 力が大きく低下し、またカップ状ヨーク及びシール板の熱変形が無視できなくなる。 最後に着磁して本発明の義歯アタッチメントが得られる。 [0036] In order to stabilize the non-magnetic phase (austenite phase) of the welded portion and to recover the magnetic force degraded by the mechanical strain of the permanent magnet incorporated in the magnetic attachment, heat treatment is performed after the planar processing. Is preferred. This heat treatment is preferably performed in an inert gas atmosphere at a temperature of 600 to 1100 ° C for 0.5 to 10 hours, preferably 700 to 900 ° C for 5 hours, and then cooled to room temperature. If the heat treatment conditions are less than 0.5 hours at 600 ° C X, the effect of the heat treatment is not sufficient. The force is greatly reduced, and the thermal deformation of the cup-shaped yoke and the seal plate cannot be ignored. Finally, it is magnetized to obtain the denture attachment of the present invention.
[0037] 図 1(c)に示すように、カップ状ヨーク 1とシール板 3との隙間 Xのために、全周溶接し た後、カップ状ヨーク 1は内側に僅かに変形する。スポット溶接によりシール板 3をカツ プ状ヨーク 1に固定し、さらに全周溶接を行っているので変形は周方向でほぼ均一に 生じる。この変形量 z'は隙間 Xのほぼ半分である。これは、カップ状ヨーク 1の内側へ の変形量は直径方向両端で z'ずつあるので、全体では 2ζ'となるからである。例えば 平面加工によりシール板 3が約 20%薄くなる場合、平面加工後の変形量 ζは ζ'の約 80 %となる。一般に変形量 ζは 10— 40 m程度である。  As shown in FIG. 1 (c), after welding the entire circumference due to the gap X between the cup-shaped yoke 1 and the seal plate 3, the cup-shaped yoke 1 is slightly deformed inward. Since the sealing plate 3 is fixed to the cup-shaped yoke 1 by spot welding and the entire circumference is welded, deformation occurs almost uniformly in the circumferential direction. This deformation z ′ is almost half of the gap X. This is because the amount of inward deformation of the cup-shaped yoke 1 is z ′ at both ends in the diametrical direction, and is 2 ° ′ as a whole. For example, when the seal plate 3 is thinned by about 20% by the flat processing, the deformation amount の after the flat processing is about 80% of ζ ′. In general, the deformation ζ is about 10-40 m.
[0038] 図 4(a)及び 4(b)は本発明の第二の実施形態による義歯アタッチメントを示し、図 5 はその製造工程を示す。この実施形態では、カップ状ヨーク 21とシールリング 25の第 一の突き合わせ部 21aを覆うスポット溶接部 26e, 26g, 26i, 26kと、シールリング 25と板 状ヨーク 24の第二の突き合わせ部 24aとを覆うスポット溶接部 26f, 26h, 26j, 261を形成 するとともに、第一の突き合わせ部 21a及び第二の突き合わせ部 24aに個別に第一の 全周溶接部 27a及び第二の全周溶接部 27bを形成する。隣接するスポット溶接部 26e 及び 26f, 26g及び 26h, 26i及び 26j,及び 26k及び 261は重ならず、また第一の全周溶 接部 27a及び第二の全周溶接部 27bも重ならな ヽ。第一の全周溶接部 27aと第二の全 周溶接部 27bとの間に非磁性シールリング 25が露出しているので、カップ状ヨーク 21 と板状ヨーク 24との間の磁束の短絡を効果的に防止することができる。  FIGS. 4 (a) and 4 (b) show a denture attachment according to the second embodiment of the present invention, and FIG. 5 shows a manufacturing process thereof. In this embodiment, spot welds 26e, 26g, 26i, 26k covering the first butted portion 21a of the cup-shaped yoke 21 and the seal ring 25, and the second butted portion 24a of the seal ring 25 and the plate-shaped yoke 24 Spot welds 26f, 26h, 26j, 261 that cover the first and second full-circle welds 27a and 27b, respectively, on the first butt 21a and the second butt 24a. To form Adjacent spot welds 26e and 26f, 26g and 26h, 26i and 26j, and 26k and 261 do not overlap, nor does the first full circumference weld 27a and the second full circumference weld 27b. . Since the non-magnetic seal ring 25 is exposed between the first full circumference weld 27a and the second full circumference weld 27b, a short circuit of magnetic flux between the cup-shaped yoke 21 and the plate-shaped yoke 24 can be prevented. It can be effectively prevented.
[0039] 第二の実施形態の義歯アタッチメントの製造方法は、スポット溶接部 26e— 261及び 全周溶接部 27a及び 27bを個別に形成する以外、第一の実施形態と同様にする。  The method of manufacturing the denture attachment of the second embodiment is the same as that of the first embodiment, except that the spot welds 26e-261 and the entire circumferential welds 27a and 27b are individually formed.
[0040] 図 6(a)及び 6(b)は本発明の第三の実施形態による義歯アタッチメントを示し、図 7 はその製造工程を示す。この実施形態の義歯アタッチメントは、カップ状ヨーク 31とシ ールリング 35の第一の突き合わせ部 31aを覆うスポット溶接部 36e, 36g, 36i, 36kと、シ ールリング 35と板状ヨーク 34の第二の突き合わせ部 34aとを覆うスポット溶接部 36f, 36h, 36j, 361を有するとともに、第一の突き合わせ部 31a及び第二の突き合わせ部 34aに個別に第一の全周溶接部 37a及び第二の全周溶接部 37bを有する点では第二 の実施形態のものと同じである力 隣接するスポット溶接部 36e及び 36f, 36g及び 36h , 36i及び 36j,及び 36k及び 361が重なり、また第一の全周溶接部 37a及び第二の全周 溶接部 37bも重なる点で、第二の実施形態のものと異なる。例えば、符号 36mはスポッ ト溶接部 36k及び 361が重なる部分であり、符号 37cは第一の全周溶接部 37a及び第二 の全周溶接部 37bが重なる部分である。図 6(a)に点線で示すように、第一の全周溶 接部 37aと第二の全周溶接部 37bとの重なり部はシールリング 35のほぼ中央部にある 力 カップ状ヨーク 31や板状ヨーク 34の軟磁性材料がほとんど混入しないので、磁気 回路上特に問題にならない。また上記重なり部は平面加工によりほとんど除去される FIGS. 6 (a) and 6 (b) show a denture attachment according to a third embodiment of the present invention, and FIG. 7 shows a manufacturing process thereof. The denture attachment of this embodiment includes a spot welded portion 36e, 36g, 36i, 36k covering the first butted portion 31a of the cup-shaped yoke 31 and the seal ring 35, and a second butted portion of the seal ring 35 and the plate-shaped yoke 34. The first and second full-circle welds 37a, 36h, 36j, and 361 respectively cover the first and third full-circle welds 37a and 34a. Force similar to that of the second embodiment in that it has a portion 37b Adjacent spot welds 36e and 36f, 36g and 36h , 36i and 36j, and 36k and 361 overlap with each other, and the first full circumference weld 37a and the second full circumference weld 37b also overlap with those of the second embodiment. For example, reference numeral 36m is a portion where the spot welds 36k and 361 overlap, and reference numeral 37c is a portion where the first full circumference weld 37a and the second full circumference weld 37b overlap. As shown by the dotted line in FIG. 6 (a), the overlapping portion between the first full-circumferential welded portion 37a and the second full-perimeter welded portion 37b is located at the substantially central portion of the seal ring 35. Since the soft magnetic material of the plate-like yoke 34 is hardly mixed, there is no particular problem in the magnetic circuit. Moreover, the above-mentioned overlapping part is almost removed by plane processing.
[0041] 図 8(a)及び 8(b)は本発明の第四の実施形態による義歯アタッチメントを示す。この 実施形態の義歯アタッチメントは、カップ状ヨーク 41とシールリング 45の第一の突き合 わせ部と、シールリング 45と板状ヨーク 44の第二の突き合わせ部とを覆うスポット溶接 部 46a— 46dを有するとともに、第一の突き合わせ部及び第二の突き合わせ部に個別 に第一の全周溶接部 47a及び第二の全周溶接部 47bを有する。スポット溶接部 46a— 46dは第一の実施形態と同様に形成し、第一の全周溶接部 47a及び第二の全周溶接 部 47bは第三の実施形態と同様に形成する。 FIGS. 8 (a) and 8 (b) show a denture attachment according to a fourth embodiment of the present invention. The denture attachment of this embodiment includes a spot welded portion 46a-46d that covers the first butted portion of the cup-shaped yoke 41 and the seal ring 45 and the second butted portion of the seal ring 45 and the plate-shaped yoke 44. In addition, the first butting portion and the second butting portion each have a first full circumference welded portion 47a and a second full circumference welded portion 47b. The spot welds 46a-46d are formed in the same manner as in the first embodiment, and the first full circumference weld 47a and the second full circumference weld 47b are formed in the same manner as the third embodiment.
[0042] 図 9(a)及び 9(b)は本発明の第五の実施形態による義歯アタッチメントを示す。この 実施形態の義歯アタッチメントは、シール板 53の板状ヨーク 54とシールリング 55の間 に Niメツキ層 54bが設けられている以外、第一の実施形態のものと同じである。 Niメッ キ層 54bを例えば 15 mの厚さとすると、シール板 53はその分だけ半径寸法を小さく する。 Niメツキ層 54bがシール板 53の軟磁性材料と溶融混合すると、非磁性合金に変 わるので、板状ヨーク 54とカップ状ヨーク 51との間の磁束の漏洩を効果的に防止する ことができる。  FIGS. 9 (a) and 9 (b) show a denture attachment according to a fifth embodiment of the present invention. The denture attachment of this embodiment is the same as that of the first embodiment except that a Ni plating layer 54b is provided between the plate-like yoke 54 of the seal plate 53 and the seal ring 55. If the Ni plating layer 54b has a thickness of, for example, 15 m, the radius of the seal plate 53 is reduced accordingly. When the Ni plating layer 54b is melt-mixed with the soft magnetic material of the seal plate 53, it changes into a non-magnetic alloy, so that leakage of magnetic flux between the plate yoke 54 and the cup yoke 51 can be effectively prevented. .
[0043] 図 10は本発明の第六の実施形態による義歯アタッチメントを示す。この実施形態の 義歯アタッチメントは、拡径部 61cを有するカップ状ヨーク 61を有することを特徴とする 。これ以外の点は第二の実施形態の義歯アタッチメントと同様にする。板状ヨーク 64 とカップ状ヨーク 61との間の磁束の漏洩を効果的に防止する磁気ギャップとして作用 ために、拡径部 61cの半径方向深さ(w— w )は 20— 200 μ m程度であるのが好ましい。  FIG. 10 shows a denture attachment according to a sixth embodiment of the present invention. The denture attachment of this embodiment has a cup-shaped yoke 61 having an enlarged diameter portion 61c. Other points are the same as those of the denture attachment of the second embodiment. In order to function as a magnetic gap that effectively prevents the leakage of magnetic flux between the plate-shaped yoke 64 and the cup-shaped yoke 61, the radial depth (w-w) of the enlarged diameter portion 61c is about 20-200 μm. It is preferred that
1  1
また拡径部 61cの高さ h (カップ状ヨーク 61の上端面と段差 61dの下端部との距離)は 200— 400 m程度であるのが好ましい。段差 61dの傾斜角(水平線との角度)は 0— 60° であるのが好ましい。図 10の磁気アタッチメントでは、カップ状ヨーク 61の凹部拡 径部 61cの底付近の外径に対して凹部 61cの開口端付近の領域が縮径しているのが 外観の特徴である。 The height h (distance between the upper end surface of the cup-shaped yoke 61 and the lower end of the step 61d) of the enlarged diameter portion 61c is It is preferably about 200 to 400 m. It is preferable that the inclination angle (the angle with the horizontal line) of the step 61d is 0-60 °. In the magnetic attachment shown in FIG. 10, the outer appearance is characterized in that the area near the opening end of the concave portion 61c is smaller in diameter than the outer diameter near the bottom of the enlarged diameter portion 61c of the cup-shaped yoke 61.
[0044] この実施形態の場合、磁束の漏洩の効果的な防止のために、シールリング 65の内 端部は永久磁石 62の側面より内側に位置しているのが好ましい。従って、シールリン グ 65の厚さは 40— 400 μ m程度であるのが好ましい。  In this embodiment, the inner end of the seal ring 65 is preferably located inside the side surface of the permanent magnet 62 in order to effectively prevent the leakage of magnetic flux. Therefore, the thickness of the seal ring 65 is preferably about 40 to 400 μm.
[0045] 本発明を以下の実施例によりさらに詳細に説明するが、本発明はそれらに限定さ れるものではない。なお各実施例及び各比較例において、カップ状ヨーク及び円板 状ヨークを耐食性軟磁性ステンレス鋼 SUS447J1 (飽和磁化 Bs : 1.28 T)により形成し、 シールリングを耐食性非磁性ステンレス鋼 SUS316Lにより形成し、円板状永久磁石を Nd-Fe-B系異方性焼結磁石 (株式会社 NEOMAX製 NMX-48CH、残留磁束密度 Br: 1.35 T、最大エネルギー積 (BH)max: 366 kj/m3)により形成した。また永久磁石の寸 法は外径 2.55 mm X高さ 0.4 mmであった。 [0045] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In each of the examples and comparative examples, the cup-shaped yoke and the disk-shaped yoke were formed of corrosion-resistant soft magnetic stainless steel SUS447J1 (saturated magnetization Bs: 1.28 T), and the seal ring was formed of corrosion-resistant nonmagnetic stainless steel SUS316L. The disk-shaped permanent magnet is made of Nd-Fe-B anisotropic sintered magnet (NEOMAX NMX-48CH, residual magnetic flux density Br: 1.35 T, maximum energy product (BH) max: 366 kj / m 3 ) Formed. The dimensions of the permanent magnet were 2.55 mm in outer diameter and 0.4 mm in height.
[0046] 実飾 II  [0046] Decoration II
表 1に示すサイズのカップ状ヨーク及びシール板を使用した。このシール板は円板 状ヨーク用の丸棒にシールリングとなるべき円筒材を嵌め、引抜き加工したものを厚 さ 0.2 mmにスライスした後、還元性雰囲気中で 800°Cで熱処理し、室温まで冷却した ものである。得られたシール板は円板状ヨークの外周にシールドリングが弱く接合し たものであった。図 1(b)に示すように組み立て、表 2に示すように直径 2.4 mmの円周( 図 1(a)の点 0を中心とする)に沿って 90° の等角度間隔で 0.5 mmのスポット径のレー ザ光によりスポット溶接による仮止めを行い、次いで同じ直径 2.4 mmの円周に沿って 0.5 mmのスポット径のレーザ光により全周溶接を行った [図 l(c)]。図 3(b)に示すよう に、溶接直後のカップ状ヨーク 1は z'だけ開口部が縮径していた。これは、カップ状ョ ーク 1とシール板 3との隙間 Xを埋める方向にカップ状ヨーク 1の開口端付近の領域が 変形したためである。最後に 0.05 mmの深さ δまでラップ研磨して、溶接面を最大面 粗さ Rmax力 l /z m以下となるように仕上げ、図 1(a)及び (d)に示す義歯アタッチメント を作製した。平面加工後の溶接部の深さは 0.1 mmと均一であった。平面研磨後 800 °Cのアルゴン雰囲気中で 1時間熱処理した。カップ状ヨーク 1の開口部外径の縮小量 は平面研磨後は z (表 3中の値)に減少した [図 l(d)]。図 1(d)に示すように、平面研磨 後に磁気アタッチメントを着磁した。 Cup-shaped yokes and seal plates of the sizes shown in Table 1 were used. This seal plate is made by fitting a cylindrical material to be a seal ring to a round bar for a disk-shaped yoke, slicing it to a thickness of 0.2 mm, heat-treating it at 800 ° C in a reducing atmosphere, It has been cooled down. The obtained seal plate had a weakly joined shield ring on the outer periphery of the disk-shaped yoke. Assemble as shown in Fig. 1 (b), and as shown in Table 2, 0.5 mm of equiangular intervals of 90 ° along a 2.4 mm diameter circumference (centered at point 0 in Fig. Temporary fixation was performed by spot welding using a laser beam with a spot diameter, and then welding was performed with a laser beam with a spot diameter of 0.5 mm along the same circumference of 2.4 mm diameter [Fig. L (c)]. As shown in FIG. 3 (b), the opening of the cup-shaped yoke 1 immediately after the welding was reduced by z ′. This is because the region near the opening end of the cup-shaped yoke 1 was deformed in a direction to fill the gap X between the cup-shaped yoke 1 and the seal plate 3. Finally, the lap was polished to a depth δ of 0.05 mm, and the weld surface was finished so as to have a maximum surface roughness Rmax force l / zm or less, and the denture attachment shown in FIGS. 1 (a) and (d) was produced. The depth of the weld after flattening was uniform at 0.1 mm. After plane polishing 800 Heat treatment was performed for 1 hour in an argon atmosphere at ° C. The reduction in the outside diameter of the opening of the cup-shaped yoke 1 was reduced to z (value in Table 3) after surface polishing [Figure l (d)]. As shown in Fig. 1 (d), the magnetic attachment was magnetized after planar polishing.
[0047] 得られた義歯アタッチメントについて、カップ状ヨーク 1とシールリング 5との間のバリ の有無、カップ状ヨーク 1の外径のばらつき及び減少量 z、シール板 3の浮き上がり量 t 、及び磁気吸引力を測定した。測定結果を表 3に示す。  [0047] Regarding the obtained denture attachment, the presence or absence of burrs between the cup-shaped yoke 1 and the seal ring 5, the variation and reduction z of the outer diameter of the cup-shaped yoke 1, the rising amount t of the sealing plate 3, and the magnetic field The suction force was measured. Table 3 shows the measurement results.
[0048] 磁気吸引力の測定には、図 23に示す装置を用いた。この測定装置は、義歯ァタツ チメント 90を固定するチャック 93と、チャック 93にアダプタ 94を介して接続するデジタ ルフォースゲージ 95と、デジタルフォースゲージ 95を動かす微動装置 96と、微動装置 96を支持するスタンド 97と、キーパ 91を支持するようにスタンド 97に固定された支持部 材 92とを具備する。チャック 93に固定した義歯アタッチメント 90と支持部材 92に固定し たキーパ 91とを吸着させた状態で、微動装置 96を徐々に上昇させ、義歯アタッチメン ト 90がキーパ 91力 離れたときのデジタルフォースゲージ 95の値を読み取った。なお 10個の義歯アタッチメント 90について磁気吸引力の測定を行い、得られた値の平均 値を磁気吸引力とした。  The apparatus shown in FIG. 23 was used for measuring the magnetic attractive force. This measuring device supports a chuck 93 for fixing a denture attachment 90, a digital force gauge 95 connected to the chuck 93 via an adapter 94, a fine movement device 96 for moving the digital force gauge 95, and a fine movement device 96. The stand includes a stand 97 and a support member 92 fixed to the stand 97 so as to support the keeper 91. With the denture attachment 90 fixed to the chuck 93 and the keeper 91 fixed to the support member 92 attracted, the fine movement device 96 is gradually raised, and the digital force gauge when the denture attachment 90 is separated by the keeper 91 force. A value of 95 was read. The magnetic attraction force was measured for ten denture attachments 90, and the average of the obtained values was defined as the magnetic attraction force.
[0049] 実飾 12— 6  [0049] Decoration 12— 6
表 1に示すサイズのカップ状ヨーク及びシール板 (シール板は 、ずれも実施例 1と同 様に円板状ヨークの外周にシールドリングが弱く接合されたものであった。 )を使用し 、図 5に示すように組み立て、表 2に示すようにカップ状ヨーク 21とシールリング 25の突 き合わせ部を覆うように直径 2.6 mmの円周(図 5(a)の点 0を中心とする)に沿って 90° の等角度間隔で 0.2 mmのスポット径のレーザ光により第一のスポット溶接をするととも に、シールリング 25と板状ヨーク 24の突き合わせ部を覆うように直径 2.2 mmの円周( 図 5(a)の点 0を中心とする)に沿って 90° の等角度間隔で 0.2 mmのスポット径のレー ザ光により第二のスポット溶接を行い、シール板 23のカップ状ヨーク 21への仮止めを した。次いで第一のスポット溶接の円周と同じ直径 2.6 mmの円周に沿って 0.2 mmの スポット径のレーザ光により第一の全周溶接を行うとともに、第二のスポット溶接の円 周と同じ直径 2.2 mmの円周に沿って 0.2 mmのスポット径のレーザ光により第二の全 周溶接を行った [図 5(d)]。最後に 0.05 mmの深さ δ まで研磨して溶接面を平坦化し 、図 4(a)及び (b)に示す義歯アタッチメントを作製した。得られた義歯アタッチメントに ついて、実施例 1と同様にして、カップ状ヨーク 21とシールリング 25との間のバリの有 無、カップ状ヨーク 21の外径のばらつき及び減少量 z、シール板 23の浮き上がり量 t、 及び磁気吸引力を測定した。測定結果を表 3に示す。 A cup-shaped yoke and a seal plate having the sizes shown in Table 1 (the seal plate had a misalignment in which the shield ring was weakly joined to the outer periphery of the disk-shaped yoke as in Example 1) were used. Assemble as shown in Fig. 5, and as shown in Table 2, a circumference of 2.6 mm in diameter covering the butted portion of cup-shaped yoke 21 and seal ring 25 (centering on point 0 in Fig. 5 (a)). The first spot welding is performed by laser beam with a spot diameter of 0.2 mm at 90 ° equiangular intervals along with), and a circle with a diameter of 2.2 mm covers the butted portion of the seal ring 25 and the plate-shaped yoke 24. A second spot welding is performed along the circumference (centered at point 0 in Fig. 5 (a)) with laser light having a spot diameter of 0.2 mm at equiangular intervals of 90 °. Temporarily fixed to 21. Next, along with the circumference of 2.6 mm in diameter, which is the same as the circumference of the first spot welding, the first full circumference welding is performed using a laser beam with a spot diameter of 0.2 mm, and the same diameter as the circumference of the second spot welding. A second full circumference weld was performed using a laser beam with a spot diameter of 0.2 mm along the circumference of 2.2 mm [Fig. 5 (d)]. Finally, the weld surface is flattened by polishing to a depth δ of 0.05 mm. The denture attachment shown in FIGS. 4 (a) and 4 (b) was produced. Regarding the obtained denture attachment, in the same manner as in Example 1, the presence or absence of burrs between the cup-shaped yoke 21 and the seal ring 25, the variation in the outer diameter of the cup-shaped yoke 21 and the amount of reduction z, the sealing plate 23 The lifting amount t of the sample and the magnetic attraction force were measured. Table 3 shows the measurement results.
[0050] 実施例 7 Example 7
表 2に示すようにスポット溶接及び全周溶接用のレーザ光のスポット径をそれぞれ 0.3 mmとした以外実施例 2と同様にして、図 6に示す義歯アタッチメントを作製し、特 性を測定した。測定結果を表 3に示す。  As shown in Table 2, a denture attachment shown in FIG. 6 was produced in the same manner as in Example 2 except that the spot diameter of the laser beam for spot welding and the laser beam for all-around welding were each 0.3 mm, and the characteristics were measured. Table 3 shows the measurement results.
[0051] 実施例 8 Example 8
表 2に示すように実施例 7と同様に全周溶接をした以外実施例 1と同様にして、図 8 に示す義歯アタッチメントを作製し、特性を測定した。測定結果を表 3に示す。  As shown in Table 2, a denture attachment shown in FIG. 8 was prepared and the characteristics were measured in the same manner as in Example 1 except that the entire circumference was welded in the same manner as in Example 7. Table 3 shows the measurement results.
[0052] 実飾 19 [0052] Decoration 19
板状ヨークとシールリングの間に厚さ 15 μ mの Niメツキ層を設けた以外実施例 1と同 様にして、図 9に示す義歯アタッチメントを作製し、特性を測定した。測定結果を表 3 に示す。  A denture attachment shown in FIG. 9 was produced in the same manner as in Example 1 except that a Ni plating layer having a thickness of 15 μm was provided between the plate-shaped yoke and the seal ring, and the characteristics were measured. Table 3 shows the measurement results.
[0053] 実施例 10— 14  Example 10—14
表 1に示すように凹部 61'に段差 61dを有するカップ状ヨークを使用した以外実施例 2 一 6と同様にして、図 10に示す義歯アタッチメントを作製した。溶接部の断面の顕微 鏡写真を図 11(a)及び (b)に示す。図 11(a)及び (b)の顕微鏡写真に対応する図 12(a) 及び (b)から明らかなように、カップ状ヨーク 71の凹部開口端近傍の外側面は垂線 U-U (垂線 U-Uは永久磁石 72の左端側輪郭線又は右端側輪郭線 V-Vに平行である 。;)に対して僅かに内側に傾斜している(直線 T-T)。義歯アタッチメントの表面を通る 直線 S-S上での垂線 U-Uと直線 Τ-Τの距離 ζはカップ状ヨーク 71の外径の減少量を表 す。各義歯アタッチメントの特性の測定結果を表 3に示す。  As shown in Table 1, a denture attachment shown in FIG. 10 was produced in the same manner as in Example 26 except that a cup-shaped yoke having a step 61d in the concave portion 61 ′ was used. Micrographs of the cross section of the weld are shown in Figs. 11 (a) and (b). As is apparent from FIGS. 12 (a) and (b) corresponding to the micrographs of FIGS. 11 (a) and (b), the outer surface near the opening end of the concave portion of the cup-shaped yoke 71 has a perpendicular UU (the perpendicular UU is permanent). Parallel to the leftmost or rightmost contour line VV of the magnet 72; inclined slightly inward with respect to;) (straight line TT). The distance 垂 between the perpendicular U-U and the straight line Τ-Τ on the straight line S-S passing through the surface of the denture attachment ζ represents the decrease in the outer diameter of the cup-shaped yoke 71. Table 3 shows the measurement results of the characteristics of each denture attachment.
[0054] 図 12(c)より、カップ状ヨーク 71の凹部の拡径部の底付近 (位置 Ρ)における外径 Dob に対して前記凹部の開口端 (位置 Q)の外径 Douが縮小している(Dob>Dou)。なお 、拡径部の底部付近 (位置 P)力 凹部開口端 (位置 Q)に至るまで、カップ状ヨーク 71 の幅 wは変わらなかった。 [0055] 実施例 15 From FIG. 12 (c), the outer diameter Dou at the opening end of the recess (position Q) is smaller than the outer diameter Dob near the bottom (position Ρ) of the enlarged diameter portion of the recess of the cup-shaped yoke 71. (Dob> Dou). The width w of the cup-shaped yoke 71 did not change until the force near the bottom of the enlarged diameter portion (position P) reached the open end of the concave portion (position Q). Example 15
表 2に示すようにスポット溶接及び全周溶接用のレーザ光のスポット径をそれぞれ 0.3 mmとした以外実施例 10と同様にして、義歯アタッチメントを作製した。溶接部の 断面の顕微鏡写真を図 13(a)及び (b)に示す。また図 14(a)及び (b)は図 13(a)及び (b)の 顕微鏡写真に対応する線図であり、図 14(c)は義歯アタッチメント全体の断面形状を 示す。この義歯アタッチメントの特性の測定結果を表 3に示す。  As shown in Table 2, a denture attachment was produced in the same manner as in Example 10 except that the spot diameter of the laser beam for spot welding and the laser beam for all-around welding were each set to 0.3 mm. Micrographs of the cross section of the weld are shown in Figs. 13 (a) and (b). FIGS. 14 (a) and (b) are diagrams corresponding to the micrographs of FIGS. 13 (a) and (b), and FIG. 14 (c) shows a cross-sectional shape of the entire denture attachment. Table 3 shows the measurement results of the characteristics of the denture attachment.
[0056] 比較例 1 Comparative Example 1
表 1及び 2に示すように、実施例 1と同じカップ状ヨーク及びシール板(両者の隙間は 30 /z m)を使用し、スポット溶接を行わずに実施例 1と同じ全周溶接を行ったところ、図 15に示すように、シール板 103は完全にカップ状ヨーク 10はり上に浮き上がり、全周 溶接を完了することができな力 た (表 3参照)。  As shown in Tables 1 and 2, using the same cup-shaped yoke and seal plate as in Example 1 (the gap between the two was 30 / zm), the same entire circumference welding as in Example 1 was performed without spot welding. However, as shown in FIG. 15, the seal plate 103 was completely lifted up on the beam of the cup-shaped yoke 10, and a force was not able to complete the entire circumference welding (see Table 3).
[0057] 比較例 2 [0057] Comparative Example 2
表 1及び 2に示すように、実施例 7と同じカップ状ヨーク及びシール板(両者の隙間は 30 m)を使用し、スポット溶接を行わずに実施例 7と同じ全周溶接を行ったところ、シ 一ル板は完全にカップ状ヨークより上に浮き上がり、全周溶接を完了することができ なかった。  As shown in Tables 1 and 2, using the same cup-shaped yoke and seal plate as in Example 7 (the gap between them was 30 m), the same perimeter welding as in Example 7 was performed without spot welding. However, the seal plate completely lifted above the cup-shaped yoke, and the entire circumference welding could not be completed.
[0058] 比較例 3 Comparative Example 3
表 1及び 2に示すように、シール板の外径とカップ状ヨークの凹部の内径とを同じに して、シール板をカップ状ヨークの凹部に圧入した以外実施例 1と同様にして、義歯 アタッチメントを作製した。シール板の圧入は面倒な作業であった。得られた義歯ァ タツチメントは、図 16に示すように、カップ状ヨーク 201とシールリング 205との間にバリ 201bを有し、またカップ状ヨーク 201は外側に僅かに変形していた。その変形方向は 本発明の義歯アタッチメントの場合と逆であるので、変形量 z (外周 201Rの半径一外周 201rの半径)をマイナスで表示する。 201Rは全周溶接後の外周を示し、 201rは圧入 後で溶接前の外周を示す。義歯アタッチメントの特性の測定結果を表 3に示す。  As shown in Tables 1 and 2, the denture was prepared in the same manner as in Example 1 except that the outer diameter of the seal plate and the inner diameter of the recess of the cup-shaped yoke were the same, and the seal plate was pressed into the recess of the cup-shaped yoke. Attachments were made. Press-fitting the seal plate was a cumbersome operation. The obtained denture attachment had a burr 201b between the cup-shaped yoke 201 and the seal ring 205, as shown in FIG. 16, and the cup-shaped yoke 201 was slightly deformed outward. Since the direction of the deformation is opposite to that of the denture attachment of the present invention, the amount of deformation z (the radius of the outer periphery 201R-the radius of the outer periphery 201r) is displayed as a minus. 201R indicates the outer circumference after the entire circumference welding, and 201r indicates the outer circumference after the press-fitting and before the welding. Table 3 shows the measurement results of the characteristics of the denture attachment.
[0059] 図 16に示すように、全周溶接によりカップ状ヨーク 201の端面の外周が 201rからAs shown in FIG. 16, the outer circumference of the end face of the cup-shaped yoke 201 is moved from 201r by full circumference welding.
201Rに拡張され、カップ状ヨーク 201の端面の面積は S [ = S X α ( αは定数、 α > 1 201R, the area of the end face of the cup-shaped yoke 201 is S [= S X α (α is a constant, α> 1
R r  R r
) ]に増大する。永久磁石 202から発生する磁束は変化しないので、カップ状ヨーク 201の端面の面積とそこから出る磁束との関係は、 B X S =B' X S (B及び Sは面積拡 r R r 張前の磁束密度及び端面の面積であり、 B'及び Sは面積拡張後の磁束密度及び端 )]. Since the magnetic flux generated from the permanent magnet 202 does not change, the cup-shaped yoke The relationship between the area of the end face of 201 and the magnetic flux emitted therefrom is BXS = B 'XS (B and S are the magnetic flux density before the area expansion r R r and the area of the end face, and B' and S are the area after the area expansion. Flux density and edge
R  R
面の面積である。)により表される。従って、 Β' = ΒΖ αである。磁気吸引力は、磁束 が通過する面積と磁束密度の二乗の積に比例するので、拡張後の磁気吸引力 F'と 拡張前の磁気吸引力 Fとの比は、(S X B'2)/(S Χ Β2) = Β'/Β = 1/ αとなる。このように The area of the surface. ). Therefore, Β '= ΒΖα. Since the magnetic attractive force is proportional to the product of the square of the magnetic flux density and the area through which the magnetic flux passes, the ratio of the magnetic attractive force F 'after expansion to the magnetic attractive force F before expansion is (SX B' 2 ) / (S Χ Β 2 ) = Β '/ Β = 1 / α . in this way
R r  R r
、圧入によりカップ状ヨーク 201の外周が拡張されると、磁気吸引力は低下する。  When the outer periphery of the cup-shaped yoke 201 is expanded by press fitting, the magnetic attraction force decreases.
[0060] これに対し、各実施例の磁気アタッチメントではいずれも、カップ状ヨークの端面の 面積S ( = Sm X BmZBs)は最適になるように(く S < S )設計される。 Bsはカップ状ョ r R On the other hand, in each of the magnetic attachments of the embodiments, the area S (= Sm × BmZBs) of the end surface of the cup-shaped yoke is designed to be optimal (<S <S). Bs is cup r r R
ークの飽和磁化、 Bmは永久磁石の残留磁束密度、 Smは永久磁石の断面積である。 なお、前記ヨーク端面の面積が Sより小さくなると磁束の通りが悪くなるので (局所的な 磁気飽和が起こるので)、磁束漏れが顕著になり、磁気吸引力が大きく低下してしまう 。本発明ではカップ状ヨークの外周が収縮した場合に最適の Sが得られるように設計 しているので、磁気吸引力は増加する。表 3に示す比較例 5の磁気吸引力の測定結 果は実施例 1のものより明らかに低力つた。  The saturation magnetization of the magnetic field, Bm is the residual magnetic flux density of the permanent magnet, and Sm is the cross-sectional area of the permanent magnet. If the area of the end face of the yoke is smaller than S, the flow of magnetic flux deteriorates (since local magnetic saturation occurs), so that magnetic flux leakage becomes remarkable and the magnetic attraction force is greatly reduced. In the present invention, the design is made to obtain the optimum S when the outer periphery of the cup-shaped yoke is contracted, so that the magnetic attraction force increases. The measurement results of the magnetic attraction force of Comparative Example 5 shown in Table 3 were clearly lower than those of Example 1.
[0061] 図 17は、シール板をカップ状ヨーク 201に圧入したときに、カップ状ヨーク 201とシー ルリング 205との突き合わせ部の一方の側に隙間が生じる様子を示す。カップ状ョー ク 201の内径とシール板の外径とは等しいので、シール板の外周の一端をカップ状ョ ーク 201の開口部に入れると、必然的にシール板の外周の他端はカップ状ヨーク 201 の開口縁部に引っ掛かる。この状態でシール板をカップ状ヨーク 201の開口部内に圧 入すると、突き合わせ部でカップ状ヨーク 201及びシール板の少なくとも一方が削れ てノ リができるとともに、突き合わせ部中のノ リを有する部分には隙間が生じる。図 17 に示すサンプルでは、板状ヨーク 204とシールリング 205とは強固に固着されているの で、その突き合わせ部には隙間は生じな力つた。  FIG. 17 shows a state in which a gap is formed on one side of the butted portion of the cup-shaped yoke 201 and the seal ring 205 when the seal plate is pressed into the cup-shaped yoke 201. Since the inner diameter of the cup-shaped yoke 201 is equal to the outer diameter of the seal plate, if one end of the outer periphery of the seal plate is inserted into the opening of the cup-shaped yoke 201, the other end of the outer periphery of the seal plate is inevitably connected to the cup. Hooked on the opening edge of the yoke 201. When the sealing plate is pressed into the opening of the cup-shaped yoke 201 in this state, at least one of the cup-shaped yoke 201 and the sealing plate is scraped off at the butted portion, and the glue is formed at the portion of the butted portion having the glue. Creates a gap. In the sample shown in FIG. 17, since the plate-like yoke 204 and the seal ring 205 were firmly fixed, a force was generated at the butted portion without any gap.
[0062] 図 18は、板状ヨーク 304とシールリング 305とが強固に固着されていないシール板を カップ状ヨーク 301に圧入したときに、カップ状ヨーク 301とシールリング 305との突き合 わせ部、及び板状ヨーク 304とシールリング 305の突き合わせ部にそれぞれ一方の側 に偏った隙間が生じる様子を示す。図 19は図 18の部分 Aの拡大図であり、図 20はそ の部分の顕微鏡写真である。図 19及び 20から明らかなように、カップ状ヨーク 301とシ ールリング 305との突き合わせ部にはノ リ 305bが残留していた。 FIG. 18 shows a portion where the cup-shaped yoke 301 and the seal ring 305 abut when the seal plate in which the plate-shaped yoke 304 and the seal ring 305 are not firmly fixed is pressed into the cup-shaped yoke 301. And a state in which a gap deviated to one side is generated at the butted portion of the plate-shaped yoke 304 and the seal ring 305. FIG. 19 is an enlarged view of part A of FIG. 18, and FIG. 20 is a micrograph of that part. As is clear from FIGS. 19 and 20, the cup-shaped yoke 301 Glue 305b remained at the butted portion with thread ring 305.
[0063] 図 21は図 20のサンプルの突き合わせ部付近を示す顕微鏡写真であり、図 22はそれ に対応する概略図である。圧入する前のシールリング 305は断面長方形状であるの で、シールリング 305の外端部が削れていることが分かる。シールリング 305の角部と力 ップ状ヨーク 301の間にバリ 301b、 305bが認められた。 FIG. 21 is a photomicrograph showing the vicinity of the butted portion of the sample in FIG. 20, and FIG. 22 is a schematic view corresponding thereto. Since the seal ring 305 before press-fitting has a rectangular cross-section, it can be seen that the outer end of the seal ring 305 is shaved. Burrs 301b and 305b were observed between the corner of the seal ring 305 and the yoke 301.
[0064] 比較例 4 [0064] Comparative Example 4
表 1及び 2に示すようにシール板の外径とカップ状ヨークの凹部の内径とを同じにし て、シール板をカップ状ヨークの凹部に圧入した以外実施例 7と同様にして、義歯ァ タツチメントを作製した。シール板の圧入は面倒な作業であった。得られた義歯ァタツ チメントの特性の測定結果を表 3に示す。表 3に示す比較例 4の磁気吸引力の測定結 果は実施例 1のものより明らかに低力つた。  As shown in Tables 1 and 2, the denture attachment was performed in the same manner as in Example 7 except that the outer diameter of the seal plate and the inner diameter of the recess of the cup-shaped yoke were the same, and the seal plate was pressed into the recess of the cup-shaped yoke. Was prepared. Press-fitting the seal plate was a cumbersome operation. Table 3 shows the measurement results of the characteristics of the obtained denture attachment. The measurement results of the magnetic attraction force of Comparative Example 4 shown in Table 3 were clearly lower than those of Example 1.
[0065] 比較例 5 Comparative Example 5
表 1及び 2に示すように板状ヨークとシールリングの間に厚さ 15 μ mの Niメツキ層を設 けた以外比較例 5と同様にして義歯アタッチメントを作製し、特性を測定した。結果を 表 3に示す。表 3に示す比較例 5の磁気吸引力の測定結果は実施例 1のものより明ら かに低力つた。またシール板の圧入は面倒な作業であった。  As shown in Tables 1 and 2, a denture attachment was prepared in the same manner as in Comparative Example 5 except that a 15 μm-thick Ni plating layer was provided between the plate yoke and the seal ring, and the characteristics were measured. Table 3 shows the results. The measurement results of the magnetic attraction force of Comparative Example 5 shown in Table 3 were clearly lower than those of Example 1. Press-fitting of the seal plate was a troublesome operation.
[0066] 比較例 6 Comparative Example 6
表 1一 3に示すようにカップ状ヨークとシール板の隙間 Xを 70 mとした以外実施例 1 と同様にして義歯アタッチメントを作製し、特性を測定した。表 3に示す比較例 6の磁 気吸引力の測定結果は実施例 1のものより明らかに低力つた。結果を表 3に示す。ま たシール板の圧入は面倒な作業であった。また表面研磨の後に溶接による凹みが残 留して平滑な面が得られず、実用に供することができな力つた。  As shown in Tables 13 and 13, a denture attachment was produced in the same manner as in Example 1 except that the gap X between the cup-shaped yoke and the seal plate was set to 70 m, and the characteristics were measured. The measurement results of the magnetic attraction force of Comparative Example 6 shown in Table 3 were clearly lower than those of Example 1. Table 3 shows the results. Press-fitting of the seal plate was a laborious operation. In addition, after polishing the surface, dents due to welding remained, and a smooth surface was not obtained, and the power was not practical.
[0067] [表 1] 例 No. 各部 ("の寸法 (mm) [0067] [Table 1] Example No. Each part (Dimensions of "(mm)
カップ状ヨーク シール板 外形 (》 凹部 (2) 段差 円板状 Ni<3> Cup-shaped yoke Seal plate Outline (>> recess (2) Step Disc-shaped Ni <3 >
ヨーク シ  Yorkshire
ω 一/レリング (4> 実施例 1 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 実施例 2 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 実施例 3 3.50X1.3 2.60X0.6 なし 2.19X0.2 なし 2.59X2.19X0.2 実施例 4 3.50X1.3 2.60X0.6 なし 2.18X0.2 なし 2.58X2.18X0.2 実施例 5 3.50X1.3 2.60X0.6 なし 2.16 0.2 なし 2.56X2.16X0.2 実施例 6 3.50X1.3 2.60X0.6 なし 2.15X0.2 なし 2.55X2.15X0.2 実施例 7 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 実施例 8 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 実施例 9 3.50X1.3 2.60X0.6 なし 2.14X0.2 あり (5) 2.57X2.17X0.2 実施例 10 3.50X1.3 2.75X0.6 あり (7) 2.32X0.2 なし 2.72X2.32X0.2 実施例 11 3.50X1.3 2.75X0.6 あり (7) 2.34X0.2 なし 2.74X2.34X0.2 実施例 12 3.50X1.3 2.75X0.6 あり (7) 2.33X0.2 なし 2.73X2.33X0.2 実施例 13 3.50X1.3 2.75X0.6 あり (7) 2.31X0.2 なし 2.71X2.31X0.2 実施例 14 3.50X1.3 2.75X0.6 あり ) 2.30X0.2 なし 2.70X2.30X0.2 実施例 15 3.50X1.3 2.75X0.6 あり (7) 2.32X0.2 なし 2.72X2.32X0.2 比較例 1 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 比較例 2 3.50X1.3 2.60X0.6 なし 2.17X0.2 なし 2.57X2.17X0.2 比較例 3 3.50 1.3 2.60X0.6 なし 2.20X0.2 なし 2.60X2.20X0.2 比較例 4 3.50X1.3 2.60X0.6 なし 2.20X0.2 なし 2.60X2.20X0.2 比較例 5 3.50X1.3 2.60X0.6 なし 2.17X0.2 あり (β> 2.60X2.20X0.2 比較例 6 3.50X1.3 2.60X0.6 なし 2.13X0.2 なし 2.53X2.13X0.2 ω 1 / Relling (4 > Example 1 3.50X1.3 2.60X0.6 None 2.17X0.2 None 2.57X2.17X0.2 Example 2 3.50X1.3 2.60X0.6 None 2.17X0.2 None 2.57X2. 17X0.2 Example 3 3.50X1.3 2.60X0.6 None 2.19X0.2 None 2.59X2.19X0.2 Example 4 3.50X1.3 2.60X0.6 None 2.18X0.2 None 2.58X2.18X0.2 Implementation Example 5 3.50X1.3 2.60X0.6 None 2.16 0.2 None 2.56X2.16X0.2 Example 6 3.50X1.3 2.60X0.6 None 2.15X0.2 None 2.55X2.15X0.2 Example 7 3.50X1.3 2.60X0.6 None 2.17X0.2 None 2.57X2.17X0.2 Example 8 3.50X1.3 2.60X0.6 None 2.17X0.2 None 2.57X2.17X0.2 Example 9 3.50X1.3 2.60X0.6 No 2.14X0.2 Yes (5) 2.57X2.17X0.2 Example 10 3.50X1.3 2.75X0.6 Yes (7) 2.32X0.2 No 2.72X2.32X0.2 Example 11 3.50X1.3 2.75X0 .6 Yes ( 7 ) 2.34X0.2 No 2.74X2.34X0.2 Example 12 3.50X1.3 2.75X0.6 Yes (7) 2.33X0.2 No 2.73X2.33X0.2 Example 13 3.50X1.3 2.75X0.6 Yes (7) 2.31X0.2 No 2.71X2.31X0.2 Example 14 3.50X1.3 2.75X0.6 Yes) 2.30X0.2 No 2.70X2.30X0.2 Example 15 3.50X1.3 2.75X0.6 Yes (7) 2.32X0.2 No 2.72X2.32X0.2 Comparative Example 1 3.50X1.3 2.60X0.6 No 2.17X0.2 None 2.57X2.17X0.2 Comparative Example 2 3.50X1.3 2.60X0.6 None 2.17X0.2 None 2.57X2.17X0.2 Comparative example 3 3.50 1.3 2.60X0.6 None 2.20X0.2 None 2.60X2.20X0.2 Comparative example 4 3.50X1.3 2.60X0 .6 None 2.20X0.2 None 2.60X2.20X0.2 Comparative Example 5 3.50X1.3 2.60X0.6 None 2.17X0.2 Available (β> 2.60X2.20X0.2 Comparative Example 6 3.50X1.3 2.60X0. 6 None 2.13X0.2 None 2.53X2.13X0.2
注: (1)外径 X高さ。 Note: (1) Outer diameter x height.
(2)内径 X深さ。  (2) Inner diameter X depth.
(3) Niメツキ層。  (3) Ni plating layer.
(4)外径 X内径 X高さ。  (4) Outer diameter X inner diameter X height.
(5)厚さ 15 mの Niメツキ層を円板状のヨークの外周に設けた (Niメツキ層を含む 板状ヨークの外径は 2.17 mである)。  (5) A 15 m thick nickel plating layer was provided on the outer periphery of the disk-shaped yoke (the outer diameter of the plate-shaped yoke including the nickel plating layer was 2.17 m).
(6)板状ヨークの外周に厚さ 15 μ mの Niメツキ層のみ形成した(Niメツキ層を含む 板状ヨークの外径は 2.20 mである)。  (6) Only a 15 μm thick Ni plating layer was formed on the outer periphery of the plate yoke (the outer diameter of the plate yoke including the Ni plating layer was 2.20 m).
(7)図 10と同様に、開口端力 深さ 0.30 mmまで拡径部(内径: 2.75 mm)があり、深 さ 0.30 mm— 0.38 mmまで斜めの段差を有し、それより深い部分では内径が 2.60 mm であった。  (7) Similar to Fig. 10, the opening end force has an enlarged diameter part (inner diameter: 2.75 mm) to a depth of 0.30 mm, a diagonal step from 0.30 mm to 0.38 mm in depth, and an inner diameter in a part deeper than that. Was 2.60 mm.
[表 2] 溶接仕様 [Table 2] Welding specifications
Figure imgf000022_0001
Figure imgf000022_0001
3] 3]
カップ状ヨークの外径 シール板の Outer diameter of cup-shaped yoke Seal plate
X ス不ッ 磁気吸引 例 No. バリ ばらつき 滅少量 ζ<» 浮き上がり  X No magnetic attraction Example No. Burr Variation Small amount ζ <»Floating
m) ト溶接 力 (N)  m) Welding force (N)
( μ νη) (mm; 重 t 、mm  (μνη) (mm; weight t, mm
実施例 1 30 あり なし 2 12 0 6.38 実施例 2 30 あり なし 2 12 0 6.43 実施例 3 10 あり なし 2 4 0 6.43 実施例 4 20 あり なし 2 8 0 6.43 実施例 5 40 あり なし 2 16 0 6.43 実施例 6 50 あり なし 4 20 0 6.43 実施例 7 30 あり なし 2 12 0 6.33 実施例 8 30 あり なし 2 12 0 6.33 実施例 9 30 あり なし 2 12 0 6.43 実施例 10 30 あり なし 2 12 0 6.62 実施例 11 10 あり なし 2 4 0 6.62 実施例 12 20 あり なし 2 8 0 6.62 実施例 13 40 あり なし 2 16 0 6.62 実施例 14 50 あり なし 4 20 0 6.62 実施例 15 30 あり なし 2 12 0 6.52 比較例 1 30 なし なし >0.2 ― 比較例 2 30 なし なし - - >0.2 ― 比較例 3 0 なし あり 35 -20 0 6.23 比較例 4 0 なし あり 35 -20 0 6.08 比較例 5 0 なし あり 35 •20 0 6.23 比較例 6 70 あり なし 10 ― 0 6.33  Example 1 30 Yes No 2 12 0 6.38 Example 2 30 Yes No 2 12 0 6.43 Example 3 10 Yes No 2 4 0 6.43 Example 4 20 Yes No 2 8 0 6.43 Example 5 40 Yes No 2 16 0 6.43 Example 6 50 Yes No 4 20 0 6.43 Example 7 30 Yes No 2 12 0 6.33 Example 8 30 Yes No 2 12 0 6.33 Example 9 30 Yes No 2 12 0 6.43 Example 10 30 Yes No 2 12 0 6.62 Example 11 10 Yes No 2 4 0 6.62 Example 12 20 Yes No 2 8 0 6.62 Example 13 40 Yes No 2 16 0 6.62 Example 14 50 Yes No 4 20 0 6.62 Example 15 30 Yes No 2 12 0 6.52 Comparative Example 1 30 None None> 0.2 ― Comparative Example 2 30 None None--> 0.2 ― Comparative Example 3 0 None With 35 -20 0 6.23 Comparative Example 4 0 None With 35 -20 0 6.08 Comparative Example 5 0 None With 35 • 20 0 6.23 Comparative example 6 70 Yes No 10 ― 0 6.33
注:(1)カップ状ヨークの外径が増大した場合はマイナスとする。 Note: (1) If the outside diameter of the cup-shaped yoke increases, the value is minus.
[0070] 実施例 1及び 8、並びに比較例 1及び 3の義歯アタッチメント耐食性を測定するため に、各サンプルを 37°Cの 5%食塩水中に 3日間浸漬後、溶接部の鲭発生状況を目視 観察するとともに、磁石が腐食されて ヽるカゝ否かを確認するために食塩水を分析した o結果を表 4に示す。 [0070] In order to measure the corrosion resistance of the denture attachments of Examples 1 and 8 and Comparative Examples 1 and 3, each sample was immersed in a 5% saline solution at 37 ° C for 3 days, and the occurrence of 鲭 in the weld was visually observed. Table 4 shows the results of the analysis of the saline solution for observation and for confirming whether or not the magnet was corroded.
[0071] [表 4] [Table 4]
例 No. 鲭の発生 食塩水の分析結果 Example No. 発 生 generated Saltwater analysis result
実施例 1 なし 全数で Ndを検出せず  Example 1 None No detection of Nd
実施例 8 なし 全数で Ndを検出せず  Example 8 None Nd was not detected in all numbers
比較例 1 あり 全数で Ndを検出した  Comparative Example 1 Yes Nd was detected in all samples
比較例 3 あり 全数で Ndを検出した  Comparative Example 3 Yes Nd was detected in all samples
上記結果より、全周溶接を行なう前にスポット溶接を行なった実施例 1及び 8の義歯 アタッチメントでは、食塩水がカップ状ヨークの凹部に浸入していな力つたのに対し、 スポット溶接を行なわずに全周溶接をした比較例 1及び 3の義歯アタッチメントでは、 食塩水がカップ状ヨークの凹部に浸入したことが分かる。 From the above results, in the denture attachments of Examples 1 and 8, in which the spot welding was performed before performing the entire circumference welding, the saline solution was not applied to the concave portion of the cup-shaped yoke, but the spot welding was performed. In the denture attachments of Comparative Examples 1 and 3 in which the entire circumference was welded, it can be seen that the saline solution penetrated into the recess of the cup-shaped yoke.

Claims

請求の範囲 The scope of the claims
[1] 永久磁石と、前記永久磁石を収納する凹部を有する耐食性軟磁性材料からなるカツ プ状ヨークと、前記カップ状ヨークの凹部の開口部に嵌入されたシール板とを有し、 前記シール板は、耐食性軟磁性材料からなる板状ヨークと、前記板状ヨークの外周 に配設された耐食性非磁性材料カゝらなるシールリングとからなり、少なくとも前記カツ プ状ヨークと前記シールリングの突き合わせ部を固定する複数箇所のスポット溶接部 と、前記カップ状ヨークと前記シールリングの突き合わせ部及び前記シールリングと前 記板状ヨークの突き合わせ部を覆うように形成された少なくとも 1つの全周溶接部によ り、前記シール板が前記カップ状ヨークに接合され、もって前記永久磁石が封止され て 、ることを特徴とする義歯アタッチメント。  [1] The seal comprises: a permanent magnet; a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet; and a seal plate fitted into an opening of the recess of the cup-shaped yoke. The plate is composed of a plate-shaped yoke made of a corrosion-resistant soft magnetic material and a seal ring made of a corrosion-resistant non-magnetic material provided on the outer periphery of the plate-shaped yoke. A plurality of spot welds for fixing the butt portion, at least one full-circle weld formed to cover the butt portion between the cup-shaped yoke and the seal ring, and the butt portion between the seal ring and the plate-shaped yoke. A denture attachment, wherein the seal plate is joined to the cup-shaped yoke by a portion, whereby the permanent magnet is sealed.
[2] 請求項 1に記載の義歯アタッチメントにおいて、前記カップ状ヨークは開口端付近が 拡径された凹部を有し、前記シール板は前記カップ状ヨークの前記拡径部に嵌入さ れており、少なくとも前記カップ状ヨークの拡径部と前記シールリングの突き合わせ部 を固定する複数箇所のスポット溶接部と、前記カップ状ヨークの拡径部と前記シール リングの突き合わせ部及び前記シールリングと前記板状ヨークの突き合わせ部を覆う ように形成された少なくとも 1つの全周溶接部により、前記シール板が前記カップ状ョ ークに接合され、もって前記拡径部と前記永久磁石との間に磁気ギャップを設けた状 態で前記永久磁石が封止されていることを特徴とする義歯アタッチメント。  [2] In the denture attachment according to claim 1, the cup-shaped yoke has a concave portion whose diameter is increased near an opening end, and the seal plate is fitted into the enlarged-diameter portion of the cup-shaped yoke. A plurality of spot-welded portions for fixing at least an enlarged portion of the cup-shaped yoke and an abutting portion of the seal ring; an abutting portion of the enlarged portion of the cup-shaped yoke and the seal ring; and the seal ring and the plate. The seal plate is joined to the cup-shaped yoke by at least one full-circumferential weld formed so as to cover the butted portion of the yoke, so that a magnetic gap is provided between the enlarged diameter portion and the permanent magnet. A denture attachment, wherein the permanent magnet is sealed in a state in which a permanent magnet is provided.
[3] 請求項 2に記載の義歯アタッチメントにおいて、前記拡径部と前記凹部の段差が 20 一 200 μ mであることを特徴とする義歯アタッチメント。  3. The denture attachment according to claim 2, wherein the step between the enlarged diameter portion and the concave portion is 20 to 200 μm.
[4] 請求項 1又は 2に記載の義歯アタッチメントにおいて、前記スポット溶接部は、前記力 ップ状ヨークと前記シールリングの突き合わせ部と、前記シールリングと前記板状ョー クの突き合わせ部に形成されて ヽることを特徴とする義歯アタッチメント。  [4] The denture attachment according to claim 1 or 2, wherein the spot-welded portion is formed at a butt portion between the power yoke and the seal ring, and at a butt portion between the seal ring and the plate-like yoke. A denture attachment characterized by being performed.
[5] 請求項 1一 4のいずれかに記載の義歯アタッチメントにおいて、前記全周溶接部は、 前記カップ状ヨークと前記シールリングの突き合わせ部を全周に亘つて覆うように形 成された第一の溶接部と、前記シールリングと前記板状ヨークの突き合わせ部を全周 に亘つて覆うように形成された第二の溶接部とからなることを特徴とする義歯アタッチ メント。 [5] The denture attachment according to any one of [14] to [14], wherein the entire circumference welded portion is formed so as to cover a butt portion between the cup-shaped yoke and the seal ring over the entire circumference. A denture attachment comprising: one welded portion; and a second welded portion formed so as to cover the butted portion of the seal ring and the plate-shaped yoke over the entire circumference.
[6] 請求項 1一 4のいずれかに記載の義歯アタッチメントにおいて、前記全周溶接部は、 前記カップ状ヨークと前記シールリングの突き合わせ部と、前記シールリングと前記板 状ヨークの突き合わせ部とを全周に亘つて一体的に覆うように形成されていることを 特徴とする義歯アタッチメント。 [6] The denture attachment according to any one of [14] to [14], wherein the entire circumference welded portion includes a butt portion between the cup-shaped yoke and the seal ring, and a butt portion between the seal ring and the plate-shaped yoke. Characterized by being formed so as to integrally cover the entire circumference of the denture.
[7] 請求項 1一 6のいずれかに記載の義歯アタッチメントにおいて、前記シール板及び前 記カップ状ヨークの表面は接合後に平面加工されていることを特徴とする義歯ァタツ チメント。 [7] The denture attachment according to any one of [16] to [16], wherein surfaces of the seal plate and the cup-shaped yoke are flattened after joining.
[8] 永久磁石と、前記永久磁石を収納する凹部を有する耐食性軟磁性材料からなるカツ プ状ヨークと、前記カップ状ヨークの凹部の開口部に嵌入されたシール板とを有し、 前記シール板は、耐食性軟磁性材料からなる板状ヨークと、前記板状ヨークの外周 に配設された耐食性非磁性材料カゝらなるシールリングとからなり、少なくとも前記カツ プ状ヨークと前記シールリングの突き合わせ部及び前記シールリングと前記板状ョー クの突き合わせ部を覆うように形成された少なくとも 1つの全周溶接部により、前記シ ール板が前記カップ状ヨークに接合され、もって前記永久磁石が封止されているとと もに、前記カップ状ヨークの前記開口端付近の領域は実質的に幅が変わることなく縮 径して 、ることを特徴とする義歯アタッチメント。  [8] The seal comprises a permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a recess for accommodating the permanent magnet, and a seal plate fitted in an opening of the recess of the cup-shaped yoke. The plate is composed of a plate-shaped yoke made of a corrosion-resistant soft magnetic material and a seal ring made of a corrosion-resistant non-magnetic material provided on the outer periphery of the plate-shaped yoke. The seal plate is joined to the cup-shaped yoke by an abutting portion and at least one full circumference welded portion formed so as to cover the abutting portion between the seal ring and the plate-like yoke. A denture attachment characterized in that, while being sealed, a region near the opening end of the cup-shaped yoke is reduced in diameter without substantially changing its width.
[9] 永久磁石と、前記永久磁石を収納するとともに開口端付近が拡径された凹部を有す る耐食性軟磁性材料からなるカップ状ヨークと、前記カップ状ヨークの前記拡径部に 嵌入されたシール板とを有し、前記シール板は、耐食性軟磁性材料からなる板状ョ ークと、前記板状ヨークの外周に配設された耐食性非磁性材料からなるシールリング と力 なり、前記カップ状ヨークの前記拡径部と前記シールリングの突き合わせ部及 び前記シールリングと前記板状ヨークの突き合わせ部を覆うように形成された少なくと も 1つの全周溶接部により、前記シール板が前記カップ状ヨークに接合され、もって前 記拡径部と前記永久磁石との間に磁気ギャップを設けた状態で前記永久磁石が封 止されているとともに、前記カップ状ヨークの前記開口端付近の領域は実質的に幅が 変わることなく縮径していることを特徴とする義歯アタッチメント。  [9] A permanent magnet, a cup-shaped yoke made of a corrosion-resistant soft magnetic material having a concave portion that accommodates the permanent magnet and has an enlarged diameter near the open end, and is fitted into the enlarged-diameter portion of the cup-shaped yoke. A sealing plate made of a corrosion-resistant soft magnetic material, and a seal ring made of a corrosion-resistant non-magnetic material disposed on the outer periphery of the plate-shaped yoke. The seal plate is formed by at least one full circumferential weld formed to cover the butted portion of the cup-shaped yoke and the butted portion of the seal ring and the butted portion of the seal ring and the plate yoke. The permanent magnet is sealed in a state where a magnetic gap is provided between the enlarged-diameter portion and the permanent magnet, and the vicinity of the opening end of the cup-shaped yoke is joined to the cup-shaped yoke. Region dental attachment, characterized in that are reduced in diameter without substantial width changes.
[10] 請求項 9に記載の義歯アタッチメントにおいて、前記拡径部と前記凹部の段差が 20 一 200 μ mであることを特徴とする義歯アタッチメント。 10. The denture attachment according to claim 9, wherein a step between the enlarged diameter portion and the concave portion is 20 to 200 μm.
[11] 耐食性軟磁性材カゝらなるカップ状のヨークの凹部に、永久磁石を収納し、耐食性軟 磁性材の板状ヨークとその外周に配設した耐食性非磁性材のシールリングとからなる シール板を前記カップ状ヨークの開口部に嵌入し、少なくとも前記カップ状ヨークと前 記シールリングの突き合わせ部を複数箇所でスポット溶接し、前記カップ状ヨークと前 記シールリングの突き合わせ部及び前記シールリングと前記板状ヨークの突き合わ せ部を覆うように前記カップ状ヨークと前記シール板を全周溶接することを特徴とする 義歯アタッチメントの製造方法。 [11] A permanent magnet is housed in a concave portion of a cup-shaped yoke made of a corrosion-resistant soft magnetic material, and is made up of a plate-shaped yoke made of a corrosion-resistant soft magnetic material and a seal ring made of a corrosion-resistant non-magnetic material disposed around the yoke. A seal plate is fitted into the opening of the cup-shaped yoke, and at least a butt portion of the cup-shaped yoke and the seal ring is spot-welded at a plurality of locations to butt-join the cup-shaped yoke and the seal ring and the seal. A method of manufacturing a denture attachment, comprising: welding the cup-shaped yoke and the seal plate all around so as to cover the butted portion of the ring and the plate-shaped yoke.
[12] 請求項 11に記載の義歯アタッチメントの製造方法において、前記カップ状ヨークと前 記シールリングの突き合わせ部と、前記シールリングと前記板状ヨークの突き合わせ 部とを一度に固定するように、前記スポット溶接を複数箇所で行なうことを特徴とする 義歯アタッチメントの製造方法。  [12] The method for manufacturing a denture attachment according to claim 11, wherein the butt portion between the cup-shaped yoke and the seal ring and the butt portion between the seal ring and the plate-shaped yoke are fixed at once. A method for manufacturing a denture attachment, wherein the spot welding is performed at a plurality of locations.
[13] 請求項 11又は 12に記載の義歯アタッチメントの製造方法において、前記全周溶接と して、前記カップ状ヨークと前記シールリングの突き合わせ部を全周に亘つて覆うよう に第一の溶接部を形成するとともに、前記シールリングと前記板状ヨークの突き合わ せ部を全周に亘つて覆うように第二の溶接部を形成することを特徴とする義歯ァタツ チメントの製造方法。  13. The method for manufacturing a denture attachment according to claim 11 or 12, wherein, as the entire circumference welding, the first welding is performed so as to cover a butt portion between the cup-shaped yoke and the seal ring over the entire circumference. Forming a second welded portion so as to cover the butted portion of the seal ring and the plate-shaped yoke over the entire circumference.
[14] 請求項 11又は 12に記載の義歯アタッチメントの製造方法において、前記カップ状ョ ークと前記シールリングの突き合わせ部と、前記シールリングと前記板状ヨークの突き 合わせ部とを全周に亘つて一体的に覆うように前記全周溶接を行うことを特徴とする 義歯アタッチメントの製造方法。  [14] The method for manufacturing a denture attachment according to claim 11 or 12, wherein a butt portion between the cup-shaped yoke and the seal ring, and a butt portion between the seal ring and the plate-shaped yoke are formed all around. A method for manufacturing a denture attachment, wherein the entire circumference is welded so as to cover the entire area integrally.
[15] 請求項 11一 14のいずれかに記載の義歯アタッチメントの製造方法において、全周溶 接後に前記シール板及び前記カップ状ヨークを平面加工することを特徴とする義歯 アタッチメントの製造方法。  [15] The method for manufacturing a denture attachment according to any one of claims 11 to 14, wherein the seal plate and the cup-shaped yoke are subjected to planar processing after full circumference welding.
PCT/JP2005/002645 2004-02-18 2005-02-18 Denture attachment and method of manufacturing the same WO2005077297A1 (en)

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KR20060120275A (en) 2006-11-24
CN1917828B (en) 2012-04-18

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