WO2007063578A1 - Screw thread cutter - Google Patents

Screw thread cutter Download PDF

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Publication number
WO2007063578A1
WO2007063578A1 PCT/JP2005/021920 JP2005021920W WO2007063578A1 WO 2007063578 A1 WO2007063578 A1 WO 2007063578A1 JP 2005021920 W JP2005021920 W JP 2005021920W WO 2007063578 A1 WO2007063578 A1 WO 2007063578A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
screw
threading
thread
cutting
Prior art date
Application number
PCT/JP2005/021920
Other languages
French (fr)
Japanese (ja)
Inventor
Takayuki Nakajima
Takayuki Matsushita
Original Assignee
Osg Corporation
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 Osg Corporation filed Critical Osg Corporation
Priority to PCT/JP2005/021920 priority Critical patent/WO2007063578A1/en
Publication of WO2007063578A1 publication Critical patent/WO2007063578A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G5/00—Thread-cutting tools; Die-heads
    • B23G5/18—Milling cutters
    • B23G5/182—Milling cutters combined with other tools
    • B23G5/186—Milling cutters combined with other tools combined with chamfering tools

Definitions

  • the present invention relates to a threading cutter for cutting a screw, and more particularly to a technique for preventing incomplete thread formation at the mouth of a female screw and the end of the screw.
  • a threading cutter is known as a tool for cutting a female screw or a male screw.
  • Patent Document 1 is equipped with an uneven screw thread corresponding to the cross-sectional shape of the screw to be formed on the outer peripheral part, and it is driven to rotate around the axis and is reciprocated relative to the object to be covered and axially It is used to cut a screw by lead feeding in the direction, and is used by being attached to an NC machining center or the like.
  • the tool described in Patent Document 1 is one example, in which a large number of ridges without leads are provided on the outer peripheral portion, and a plurality of grooves are formed so as to divide the ridges.
  • a screw cutter is provided.
  • the one described in Patent Document 1 is for cutting female threads, and has a piercing blade for cutting the pilot hole and a chamfering blade for chamfering the entrance of the pilot hole. It is provided integrally.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 63-200916
  • FIG. 6 is a cross-sectional view showing an example of the incomplete thread 62 occurring at the mouth of the female screw 60.
  • the shape (height and width) of the incomplete thread 62 is circumferential due to the inclination of the flanks. It is changing continuously in the direction.
  • the width (axial dimension) of the incomplete thread becomes equal to or less than the normal 1Z2 and further 1Z4, the incomplete thread has a small edge or a notch, so when screwing the screw, There is a possibility that screwing may cause crushing failure due to biting between threads, and may cause chipping defects as well. There is a possibility of catching
  • the present invention has been made against the background described above, and the object of the present invention is to be rotationally driven around an axis and lead-fed in an axial direction while revolving on a workpiece. Therefore, in a threading cutter that cuts a screw by cutting, small incomplete thread is not generated at the mouth of the female screw or at the end of the male screw.
  • a screw cutting blade having a concavo-convex shape corresponding to the cross-sectional shape of the screw to be formed is provided on the outer peripheral portion, and it is rotationally driven about its axis and
  • a peak force of a convex portion located on the most shank side of the concavo-convex shape of the threading blade An axial dimension T is provided so that the axial dimension T is 0.5 P or more with respect to the pitch P of the screw and the diameter becomes constant according to the constant diameter dimension or the force toward the shank side. It is characterized by
  • the threading blade in the threading cutter according to the first aspect of the present invention, (a) the threading blade is provided with a plurality of ridges without leads of a cross-sectional shape corresponding to the thread groove of the screw.
  • grooves are formed along the grooves by dividing the ridges, and (b) the cutting blade is within a range of 6 ° to 15 ° from the grooves. It is characterized in that it is formed along the groove by being subjected to No. 2 processing at a relief angle of.
  • the central force of the recess located closest to the shank in the concavo-convex shape of the threading blade is also up to the end on the shank side of the chasing blade.
  • the axial dimension F is 1 P or more.
  • a fourth invention is characterized in that, in the threading cutter of the first invention or the second invention, an axial dimension T of the scraping blade is 1 P or more.
  • a fifth invention is the threading cutter according to any one of the first invention to the fourth invention, wherein The blade is characterized in that it is a straight blade having a constant diameter and being parallel to the axial center in a rotational trajectory shape around the axial center.
  • a sixth aspect of the present invention is the threading cutter according to the fifth aspect of the present invention, characterized in that the scraping blade is provided with a tapered blade whose diameter increases continuously toward the shank side continuously with the straight blade. .
  • a seventh invention is the screw cutter according to any one of the first invention to the fourth invention, wherein the diameter of the reeding blade becomes larger as it goes to the shank side, and has a rotational locus around an axial center. It is characterized in that it is a tapered blade linearly inclined at an angle within the range of 30 ° to 60 ° with respect to the heart.
  • a plurality of the thread cutting blades are provided around the axial center, and at least one of the plurality of thread cutting blades In the above, the blade is provided.
  • the axial dimension T is not less than 0.5 P with respect to the pitch P of the screw, continuing to the convex portion located on the most shank side of the concavo-convex shape of the threading blade Since the blade is provided, so that when cutting, the screw is processed by using the blade up to the blade at the time of revolution, the incomplete thread formed at the mouth of the female screw or the end of the male screw
  • the width (axial dimension) of the incomplete thread can be less than half a circumference, and reaches the summit at 1 Z2 or more of the complete thread.
  • the axial dimension T of the scraping blade is 1 P or more, if further pressing is performed using the entire area of the scraping blade, in other words, it is a screw at the time of revolution If the force is applied all the way around, the incomplete thread can be completely eliminated.
  • the sharpening blade of the fifth invention is a straight blade, it is possible to perform the sharpening process in the minimum space necessary for cutting an internal thread, and tapering the mouth due to space problems etc. It can be applied to cases where it can not be scolded
  • the taper blade is provided following the straight blade, it is possible to carry out the cutting process only with the straight blade, or to carry out the smooth processing using both the straight blade and the taper blade. Depending on the processing conditions, etc., where the degree of freedom of processing is high, the aspect of force can be changed.
  • FIG. 1 is a view for explaining a threading cutter according to an embodiment of the present invention, in which (a) is a front view, and (b) is an enlarged view showing a rotational locus shape of a scraper blade.
  • FIG. 2 is a view for explaining an example of a screw cover method when cutting a female screw using the screw cutter of FIG. 1;
  • FIG. 3 illustrates the cross-sectional shape of the screw opening because it is processed according to the screw processing method in Fig. 2.
  • (a) shows the straight blade when the straight blade insertion amount is IP or more. This is the case where the insertion amount is about 0.5 P and incomplete thread remains.
  • FIG. 4 (a) is a photograph showing the cross-sectional shape of the female screw opening in the case where the milling process is performed with a straight blade as shown in Fig. 3 (a). It is a photograph which shows the cross-sectional shape of the female screw opening part in the case of the conventional case to cut.
  • FIG. 5 is a view for explaining another embodiment of the present invention, which corresponds to FIG. 1.
  • FIG. 6 is a cross-sectional view for explaining incomplete threading that occurs in a female screw opening in the conventional case of cutting a female screw with a screw cutting blade only.
  • the threading cutter of the present invention can be used to cut both male and female threads.
  • machining a male screw revolve around the axis of the cylindrical screw material (workpiece)
  • the lead may be fed in the axial direction while cutting the outer peripheral surface.
  • the inside of the pilot hole provided in the workpiece may be revolved around the center line to cut the inner peripheral surface while the lead is sent in the axial direction.
  • An aspect in which the screw cutter of the present invention is rotationally driven about the axis and the lead is fed in the axial direction while revolving the object to be machined to cut the screw is the method for cutting the workpiece.
  • the screw cutter may be rotationally driven around an axis while holding the screw cutter in a fixed position, and the object to be loaded may be eccentrically rotated around the screw cutter or lead-fed in the axial direction of the screw cutter.
  • the lead feeding may be to advance the screw cutter relatively to the tip side or to retract it to the shank side.
  • the screw cutter may be, for example, a general cutting blade that cuts including the crest of a female screw thread (inner diameter of a female screw) and a crest of a male screw thread (outside diameter of a male screw),
  • the concave portion is also configured to function as a cutting blade, but only the screw groove portion is cut with the convex portion having the concavo-convex shape, and the inner peripheral surface of the pilot hole becomes the crest of the female screw thread as it is.
  • the outer peripheral surface of the screw material of the above may be the crest of the male screw thread as it is.
  • the threading cutter is made of, for example, a tool material such as high-speed tool steel or cemented carbide, and is coated with a hard coating such as TiAlN, TiN, TiCN or the like as required.
  • the axial dimension T of the cutting blade may be at least 0.5 P or more, but taking into consideration the mounting error to the machine tool that is desirably 1 P or more as in the fourth invention, 1 More desirable than 5P.
  • the second invention relates to a solid threading cutter in which a convex groove and a groove are directly processed into a tool to form a threading blade and a cutting blade.
  • Force In the practice of the other inventions, separate from the tool body
  • the present invention can also be applied to a threading cutter which constitutes a tip provided with a threading blade or a scraping blade and the tip is integrally or removably attached to a tool body. Separate the tip with the threading blade from the tip with the scraping edge Tochiru.
  • a straight blade is provided with a tapered blade continuously.
  • the straight blade may be used.
  • the axial dimension T of both the straight blade and the tapered blade is at least 0.5 P or more, but in order to be able to carry out machining with only the straight blade, the straight blade is straight.
  • the axial dimension T of the tapered blade according to the seventh invention may be at least 0.5 P or more, but should be 1 P or more to form a tapered surface over the entire circumference of a male screw or a female screw. It is more desirable to make it 1.5P or more.
  • the axial dimension T of only the taper blade is desirably 1 P or more.
  • the straight blade and the tapered blade are both a straight blade in a rotational trajectory shape and a straight blade curved in a circular arc shape in a rotational trajectory shape, that is, a smooth blade whose diameter dimension changes nonlinearly in the axial direction. It is also possible to provide.
  • the screw cutting method for cutting and processing a female screw using the screw cutter according to the present invention is, for example, (a) larger than the above-mentioned screw cutter with respect to the object to be cut. (B) in the state in which the screw cutter is inserted into the pilot hole, while rotating and driving in the direction of cutting rotation about the axial center while revolving in the pilot hole.
  • the threading cutter When machining an external thread, the threading cutter is driven to rotate in the cutting rotational direction around the axis, and while it is reciprocated around the axis of the thread material and leaded in the axial direction, the thread material It is good if the screw is machined on the outer peripheral surface and that the end of the external thread is machined by the above-mentioned cutting blade at least at least half a revolution of revolution. Complete thread only without complete thread In order to achieve this, it is better if a screw cutter with an axial dimension T of IP or greater is used to carry out over 1 or more revolutions! ,.
  • FIG. 1 (a) is a front view illustrating a threading cutter 10 according to an embodiment of the present invention.
  • the threading cutter 10 has a pair of a shank 12 held by a spindle such as a machining center and the like.
  • the blade portion 18 provided with the screw cutter 16 is integrally provided in the axial direction to form a thin cutter.
  • a pair of twisting grooves 22 so as to divide the ridges 20, an uneven thread cutting blade 16 corresponding to the cross-sectional shape of the female screw 40 is provided along the twisting grooves 22.
  • the threading cutter 10 performs a cutting process by being rotationally driven clockwise when viewed from the shank 12 side, and the twist groove 22 is twisted in the same clockwise direction as the cutting rotation direction and the twisting thereof
  • the angle is, for example, about 15 ° within the range of 5 ° to 30 °.
  • the pair of screw cutting blades 16 are formed cutting edges that cut including the crest of the thread of the female screw 40 (inner diameter of the female screw), and the groove portion between the ridges 20 (concave recess) Also functions as a cutting blade.
  • the threading cutter 10 is integrally formed of cemented carbide, and the surface of the blade portion 18 is coated with a hard coating of T1A1N. It is also possible to cut an external thread using this threading cutter 10.
  • a cylindrical cylindrical portion 24 having the same outer diameter as the outer diameter of the top of the ridge 20 of the threading blade 16 is provided.
  • the cylindrical portion 24 is provided continuously on the top of a convex portion, that is, a ridge 20 located closest to the shank 12 among the concave and convex shaped thread cutting blades 16.
  • the shank 12 has a diameter larger than that of the cylindrical portion 24, and a tapered portion 26 is provided between the cylindrical portion 24 and the shank 12 so as to have a larger diameter in accordance with the force directed to the shank 12 side.
  • FIG. 1 (b) is an enlarged view showing a rotational trajectory shape of the threading blade 16 and the smoothing blade 30, ie, a diameter dimension change from the axial center S in the axial direction of the threading blade 16 and the blade 30;
  • the blade 30 includes a straight blade 32 having a constant diameter and a tapered blade 34 having a diameter that increases as the force is directed to the shank 12.
  • the straight blade 32 is a portion provided on the cylindrical portion 24, the tapered blade 34 is a portion provided on the tapered portion 26, and the taper blade 34 is 30 ° to 60 ° with respect to the axial center S. For example, it is inclined linearly at an angle of about 45 ° within the range.
  • the axial dimension T of the straight blade 32 is the pitch of the female screw 40, that is, the threading
  • the pitch P of the concave and convex shape of the cutting blade 16 is, for example, about 1.5 P at 1 P or more.
  • the axial dimension F from the center of the recess located closest to the shank 12 in the concavo-convex shape of the screw cutter 16 to the end of the straight blade 32 on the shank 12 side is 1.5 P or more. It is about 2P.
  • the axial dimension T of the tapered blade 34 is tapered over the entire circumference of the screw.
  • the overall axial dimension T of the cutting blade 30 which is preferably 1 P or more in forming the surface is, for example, about 2.5 P.
  • FIG. 2 shows a case where a blind hole female screw 40 is to be inserted, and the lower hole 44 also has a bottom.
  • the process of covering the pilot hole 44 with respect to the force receiving object 42 is the piloting process, and in the present embodiment, cutting is performed using a drill or milling cutter other than the threading cutter 10. Form by processing.
  • the threading cutter 10 attached to the main shaft of a three-dimensional machine such as a machining center is placed along the axial center O of the pilot hole 44.
  • a three-dimensional machine such as a machining center
  • the screw cutter 10 is rotationally driven about the axial center, and it revolves 180 ° around the axial center O of the pilot hole 44 and only one pitch P of the female screw 40
  • the target female screw 40 is cut by feeding the lead in the direction.
  • Example 1 the right-handed female screw 40 is cut by rotating the screw cutter 10 leftward and retracting it to the shank 12 side by one pitch P. After that, as shown in (e), while feeding the threading cutter 10 in the 90 ° release range, the inner circumferential surface force of the pilot hole 44 is smoothly separated and returned to the axial center O, (as shown in D A series of screw cutting processes are completed by pulling out along O. A series of machining processes shown in (b) to (!) Of FIG.
  • substantially the entire area of the straight blade 32 of the blade 30 is inserted into the pilot hole 44 when the threading cutter 10 in FIG. 2 (b) is inserted. It is! As a result, when screw cutting is performed in (c) to (d) of FIG. 2, the opening of the female screw 40, that is, the mouth of the female screw 40 is straightened with the straight blade 32 over the entire circumference. A counterbore-shaped straight hole 46 with a valley diameter is formed, and a complete thread-shaped internal thread 40 is formed inside (below) the straight hole 46.
  • the depth dimension of the straight hole 46 is the axial dimension T at the maximum, and the lead feed of the threading cutter 10 makes it shallow by 1 pitch P all around.
  • FIG. 3 (a) is a cross-sectional view showing a portion of the straight hole 46 provided in the opening of the female screw 40 in an enlarged manner.
  • 4 (a) is a photograph showing the cross-sectional shape of the female screw when screw cutting is performed in the same manner as above under the following processing conditions, corresponding to (a) in FIG. A straight hole is formed in the marked opening.
  • Fig. 4 (b) shows the case of processing with the conventional product. In other words, in the threading cutter 10 of this embodiment, thread cutting is performed with only the threading blade 16 without inserting the cutting blade 30 in the pilot hole 44. In the case where it is carried out, an incomplete thread similar to the incomplete thread 62 shown in (a) of FIG. 6 is generated at the opening (mouth) of the screw with a circle mark.
  • Machined thread size M12 x 1.5
  • the tapered blade 34 when the tapered blade 34 is inserted into the pilot hole 44 at the time of insertion in (b) of FIG. 2, the opening portion of the female screw 40 by the tapered blade 34, specifically, the straight hole A tapered surface may be provided at the 46 opening. If the taper blade 34 is inserted into the pilot hole 44 by 1 P or more, a taper surface can be provided on the entire circumference of the opening of the female screw 44.
  • the axial dimension T with respect to the pitch P of the screw is continuous to the convex portion located closest to the shank 12 among the concavo-convex shapes of the threading blade 16. Since a reed blade 30 of about 5 P is provided, it is formed at the mouth of the female screw 40 if cutting of the female screw 40 is performed by using the reed blade 30 at the time of revolution. Incomplete thread 62 (see Fig. 6 (a)) can be completely eliminated. As a result, when screwing together the screws 40, there is no risk that the screw threads will bite each other and the incomplete thread portion will be crushed or chipped, and problems such as screwing in can be suppressed. .
  • the straight blade 32 having an axial dimension T of about 1.5 P is provided.
  • the repelling force can be performed only with the straight blade 32, and the straight blade 32 and the tapered blade 34 can be used.
  • the straight blade 32 and the tapered blade 34 can be used.
  • a tapered surface can be provided at the mouth of the female screw 40, which facilitates screwing, etc. The same effect as in the case of applying
  • the axial dimension T of the scraping blade 30 is about 2.5 P, and the opening portion of the female screw 40 is By applying a rounding process to the entire circumference, it is possible to provide a smooth blade 30 which can eliminate the incomplete thread completely, for example, a straight blade 32 having an axial dimension T of about 0.5 P. . That is, in the screw cutter 10, the straight blade 32 is inserted into the pilot hole 44 by about 0.5 P when inserting (b) in FIG. 2 and screw cutting is performed as shown in (c) to (d). The same action and effect as in the case of processing are obtained, and only the straight hole 46 is formed by the straight blade 32 in the half circumference of the opening of the female screw 40, and the other half circumference is shown in FIG.
  • An incomplete thread 48 is formed which is partially cut away as shown in FIG. However, since the width dimension (axial direction dimension) of the incomplete thread 48 is at least 1Z2 or more of the complete thread and reaches the crest, the incomplete thread shown in FIG. 6 (a) can be obtained. As in the case of the above-mentioned embodiment, the occurrence of problems such as screwing defects can be suppressed as in the above-mentioned embodiment.
  • FIG. 5 is a view for explaining another embodiment of the present invention, which corresponds to FIG.
  • the threading cutter 50 has a tapered portion 26 continuously on the top of a convex portion, that is, a ridge 20 located closest to the shank 12 among the concave and convex thread cutting blades 16 without the cylindrical portion 24 and the straight blade 32.
  • the reed blade 52 is constituted only by the taper blade 34 provided at the taper portion 26 thereof. Also in this embodiment, when the axial dimension T is 1 P or more, a tapered surface can be provided all around the female screw 40, and the incomplete thread 62 (see FIG. 6A) is completely eliminated. It is possible to obtain the same effect as the above embodiment.
  • the threading cutter according to the present invention is rotationally driven about its axis and reed in the axial direction while revolving with respect to the object to be machined, so that a cutting blade is present when cutting a screw. Prevents the occurrence of small incomplete threads at the mouth of the female thread and the end of the external thread, and is suitable for cutting screws that do not have the possibility of threading defects etc. due to the presence of such small incomplete threads. Used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)

Abstract

In a screw thread cutter (10) which is rotary-driven about the axis and led in the axial direction, while revolving, along the inner circumferential surface of a rough hole (44) provided in a workpiece (42) thus thread cutting an internally threaded screw (40) by means of a protruding and recessed thread cutting edge (16), a flat cutting edge (30) having an axial dimension (T) of about 2.5P, where P is the pitch of the internally threaded screw (40), is provided continuously to a protrusion located closet to the shank (12) side out of the protrusions and recesses of the thread cutting edge (16). When thread cutting of the internally threaded screw (40) is performed also using the flat cutting edge (30) during revolution, a straight hole (46) is formed at the mouth of the internally threaded screw (40) and incomplete thread can be eliminated completely. Consequently, the risk of dulling or chipping at an incomplete thread due to mutual biting of threads is eliminated when the internally threaded screw (40) is screwed and the problem of defective screwing is suppressed.

Description

明 細 書  Specification
ねじ切りカッター  Thread cutter
技術分野  Technical field
[0001] 本発明はねじを切削加工するねじ切りカッターに関し、特に、めねじの口元やおね じの端部に不完全ねじ山が生じることを防止する技術に関するものである。  [0001] The present invention relates to a threading cutter for cutting a screw, and more particularly to a technique for preventing incomplete thread formation at the mouth of a female screw and the end of the screw.
背景技術  Background art
[0002] めねじやおねじを切削加工するための工具としてねじ切りカッターが知られている。  [0002] A threading cutter is known as a tool for cutting a female screw or a male screw.
これは、形成すべきねじの断面形状に対応する凹凸形状のねじ切り刃を外周部に備 え、軸心まわりに回転駆動されるとともに被カ卩ェ物に対して相対的に公転しつつ軸方 向へリード送りされることによりねじを切削加工するもので、 NCマシユングセンタなど に取り付けられて使用される。特許文献 1に記載の工具はその一例で、リードの無い 多数の凸条が外周部に設けられるとともに、その凸条を分断するように複数の溝が形 成されることにより、その溝に沿ってねじ切り刃が設けられている。また、この特許文 献 1に記載のものは、めねじを切削加工するためのもので、下穴を切削加工するため の穿孔刃、およびその下穴の入口に面取りを施すための面取り刃が一体に設けられ ている。  This is equipped with an uneven screw thread corresponding to the cross-sectional shape of the screw to be formed on the outer peripheral part, and it is driven to rotate around the axis and is reciprocated relative to the object to be covered and axially It is used to cut a screw by lead feeding in the direction, and is used by being attached to an NC machining center or the like. The tool described in Patent Document 1 is one example, in which a large number of ridges without leads are provided on the outer peripheral portion, and a plurality of grooves are formed so as to divide the ridges. A screw cutter is provided. In addition, the one described in Patent Document 1 is for cutting female threads, and has a piercing blade for cutting the pilot hole and a chamfering blade for chamfering the entrance of the pilot hole. It is provided integrally.
特許文献 1：特開昭 63 - 200916号公報  Patent Document 1: Japanese Patent Application Laid-Open No. 63-200916
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problem that invention tries to solve
[0003] し力しながら、このような従来のねじ切りカッターでねじをカ卩ェした場合、被加工物 に対して相対的にリード送りして切削加工を行うため、めねじの口元やおねじの端部 に不完全ねじ山が発生することが避けられない。図 6の (a)は、めねじ 60の口元に生 じる不完全ねじ山 62の一例を示す断面図で、この不完全ねじ山 62の形状 (高さや幅 さ）はフランクの傾斜により周方向において連続的に変化している。そして、特に不完 全ねじ山の幅 (軸方向寸法）が正規の 1Z2以下、更には 1Z4になると、不完全ねじ 山が小さなエッジ状乃至ノ リ状になるため、ねじを螺合する際にねじ山同士の食付き で潰れたり欠けたりしてねじ込み不良を生じる恐れがあるとともに、欠けた破片がねじ を疵付ける可能性がある。 [0003] When a screw is cut with such a conventional threading cutter while performing a force, the lead of the workpiece is fed relative to the workpiece to perform cutting. Incomplete threading at the end of the can not be avoided. (A) of FIG. 6 is a cross-sectional view showing an example of the incomplete thread 62 occurring at the mouth of the female screw 60. The shape (height and width) of the incomplete thread 62 is circumferential due to the inclination of the flanks. It is changing continuously in the direction. In particular, when the width (axial dimension) of the incomplete thread becomes equal to or less than the normal 1Z2 and further 1Z4, the incomplete thread has a small edge or a notch, so when screwing the screw, There is a possibility that screwing may cause crushing failure due to biting between threads, and may cause chipping defects as well. There is a possibility of catching
[0004] なお、ねじの口元やおねじの端部にテーパ状の面取りを施した場合でも事情は同 じである。すなわち、上記めねじ 60において、図 6(b)に示すように開口部にテーパ 状の面取り 64を施しても、その面取り 64の内部に依然として不完全ねじ山 66が生じ るのである。  [0004] The situation is the same even in the case where tapers of the screw mouth and the end of the male screw are tapered. That is, in the above-mentioned internal thread 60, even if the chamfered portion 64 is tapered at the opening as shown in FIG. 6 (b), incomplete thread 66 still occurs inside the chamfered portion 64.
[0005] 本発明は以上の事情を背景として為されたもので、その目的とするところは、軸心ま わりに回転駆動されるとともに被加工物に対して公転しつつ軸方向へリード送りされ ることによりねじを切削加工するねじ切りカッターにおいて、めねじの口元やおねじの 端部に小さな不完全ねじ山が発生しないようにすることにある。  The present invention has been made against the background described above, and the object of the present invention is to be rotationally driven around an axis and lead-fed in an axial direction while revolving on a workpiece. Therefore, in a threading cutter that cuts a screw by cutting, small incomplete thread is not generated at the mouth of the female screw or at the end of the male screw.
課題を解決するための手段  Means to solve the problem
[0006] かかる目的を達成するために、第 1発明は、形成すべきねじの断面形状に対応す る凹凸形状のねじ切り刃を外周部に備え、軸心まわりに回転駆動されるとともに被カロ ェ物に対して相対的に公転しつつ軸方向へリード送りされることによりねじを切削加 ェするねじ切りカッターにおいて、前記ねじ切り刃の凹凸形状のうち最もシャンク側に 位置する凸部の頂力 そのシャンク側に連続する部分には、軸方向寸法 Tが前記ね じのピッチ Pに対して 0. 5P以上のさらい刃力 一定の径寸法乃至はシャンク側へ向 力 に従って大径となるように設けられて 、ることを特徴とする。  In order to achieve the above object, according to a first aspect of the present invention, a screw cutting blade having a concavo-convex shape corresponding to the cross-sectional shape of the screw to be formed is provided on the outer peripheral portion, and it is rotationally driven about its axis and In a threading cutter for cutting and screwing a screw by being reed in an axial direction while relatively revolving with respect to an object, a peak force of a convex portion located on the most shank side of the concavo-convex shape of the threading blade An axial dimension T is provided so that the axial dimension T is 0.5 P or more with respect to the pitch P of the screw and the diameter becomes constant according to the constant diameter dimension or the force toward the shank side. It is characterized by
[0007] 第 2発明は、第 1発明のねじ切りカッターにおいて、 (a)前記ねじ切り刃は、前記ねじ のねじ溝に対応する断面形状のリードの無い複数の凸条が外周部に設けられるとと もに、それ等の凸条を分断するように溝が形成されることにより、その溝に沿って設け られており、（b)前記さらい刃は、前記溝から 6° 〜15° の範囲内の逃げ角で二番取 り加工が施されることにより、その溝に沿って形成されていることを特徴とする。  According to a second aspect of the present invention, in the threading cutter according to the first aspect of the present invention, (a) the threading blade is provided with a plurality of ridges without leads of a cross-sectional shape corresponding to the thread groove of the screw. In addition, grooves are formed along the grooves by dividing the ridges, and (b) the cutting blade is within a range of 6 ° to 15 ° from the grooves. It is characterized in that it is formed along the groove by being subjected to No. 2 processing at a relief angle of.
[0008] 第 3発明は、第 1発明または第 2発明のねじ切りカッターにおいて、前記ねじ切り刃 の凹凸形状のうち最もシャンク側に位置する凹所の中心力も前記さらい刃のシャンク 側の端部までの軸方向寸法 Fは 1P以上であることを特徴とする。  According to a third invention, in the threading cutter according to the first invention or the second invention, the central force of the recess located closest to the shank in the concavo-convex shape of the threading blade is also up to the end on the shank side of the chasing blade. The axial dimension F is 1 P or more.
[0009] 第 4発明は、第 1発明または第 2発明のねじ切りカッターにおいて、前記さらい刃の 軸方向寸法 Tは 1P以上であることを特徴とする。  [0009] A fourth invention is characterized in that, in the threading cutter of the first invention or the second invention, an axial dimension T of the scraping blade is 1 P or more.
[0010] 第 5発明は、第 1発明〜第 4発明の何れかのねじ切りカッターにおいて、前記さらい 刃は、径寸法が一定で軸心まわりの回転軌跡形状においてその軸心と平行となるス トレート刃であることを特徴とする。 [0010] A fifth invention is the threading cutter according to any one of the first invention to the fourth invention, wherein The blade is characterized in that it is a straight blade having a constant diameter and being parallel to the axial center in a rotational trajectory shape around the axial center.
[0011] 第 6発明は、第 5発明のねじ切りカッターにおいて、前記さらい刃は、前記ストレート 刃に連続して前記シャンク側へ向かうに従って大径となるテーパ刃を備えて 、ること を特徴とする。  [0011] A sixth aspect of the present invention is the threading cutter according to the fifth aspect of the present invention, characterized in that the scraping blade is provided with a tapered blade whose diameter increases continuously toward the shank side continuously with the straight blade. .
[0012] 第 7発明は、第 1発明〜第 4発明の何れかのねじ切りカッターにおいて、前記さらい 刃は、前記シャンク側へ向かうに従って大径となり、軸心まわりの回転軌跡形状にお いてその軸心に対して 30° 〜60° の範囲内の角度で直線的に傾斜するテーパ刃 であることを特徴とする。  [0012] A seventh invention is the screw cutter according to any one of the first invention to the fourth invention, wherein the diameter of the reeding blade becomes larger as it goes to the shank side, and has a rotational locus around an axial center. It is characterized in that it is a tapered blade linearly inclined at an angle within the range of 30 ° to 60 ° with respect to the heart.
[0013] 第 8発明は、第 1発明〜第 7発明の何れかのねじ切りカッターにおいて、前記ねじ 切り刃は軸心まわりに複数設けられているとともに、その複数のねじ切り刃の少なくと も一つに前記さらい刃が設けられていることを特徴とする。  According to an eighth aspect of the present invention, in the threading cutter according to any one of the first to seventh aspects, a plurality of the thread cutting blades are provided around the axial center, and at least one of the plurality of thread cutting blades In the above, the blade is provided.
発明の効果  Effect of the invention
[0014] このようなねじ切りカッターにおいては、ねじ切り刃の凹凸形状のうち最もシャンク側 に位置する凸部に連続して、軸方向寸法 Tがねじのピッチ Pに対して 0. 5P以上のさ b 、刃が設けられて 、るため、公転時にそのさら 、刃まで使ってねじの切削加工が 行われるようにすれば、めねじの口元やおねじの端部に形成される不完全ねじ山を 半周以下にすることができ、その不完全ねじ山の幅 (軸方向寸法）は完全ねじ山の 1 Z2以上で山頂まで達している。このため、ねじを螺合する際にねじ山同士が食い付 いて不完全ねじ山が潰れたり欠けたりすることが防止され、ねじ込み不良などの問題 が発生することが抑制される。  [0014] In such a threading cutter, the axial dimension T is not less than 0.5 P with respect to the pitch P of the screw, continuing to the convex portion located on the most shank side of the concavo-convex shape of the threading blade Since the blade is provided, so that when cutting, the screw is processed by using the blade up to the blade at the time of revolution, the incomplete thread formed at the mouth of the female screw or the end of the male screw The width (axial dimension) of the incomplete thread can be less than half a circumference, and reaches the summit at 1 Z2 or more of the complete thread. As a result, when the screws are screwed together, it is prevented that the screw threads bite each other and the incomplete screw thread is crushed or chipped, and the occurrence of problems such as screwing failure is suppressed.
[0015] 第 4発明では、さらい刃の軸方向寸法 Tが 1P以上であるため、そのさらい刃の全域 を使ってさら 、力卩ェが行われるようにすれば、言 、換えれば公転時にねじの全周に 亘つてさら 、力卩ェが行われるようにすれば、不完全ねじ山を完全に無くすことができ る。  In the fourth aspect of the invention, since the axial dimension T of the scraping blade is 1 P or more, if further pressing is performed using the entire area of the scraping blade, in other words, it is a screw at the time of revolution If the force is applied all the way around, the incomplete thread can be completely eliminated.
[0016] 第 5発明のさらい刃はストレート刃であるため、めねじを切削加工する場合に必要 最小限のスペースでさらい加工を行うことが可能であり、スペース上の問題などで口 元をテーパ状にさらうことができない場合にも適用できる。 [0017] 第 6発明では、ストレート刃に続いてテーパ刃が設けられているため、ストレート刃の みでさらい加工を行うこともできるし、ストレート刃およびテーパ刃の両方を用いてさら い加工を行うこともできるなど、さらい加工の自由度が高ぐ加工条件などに応じてさ b 、力卩ェの態様を変更できる。 [0016] Since the sharpening blade of the fifth invention is a straight blade, it is possible to perform the sharpening process in the minimum space necessary for cutting an internal thread, and tapering the mouth due to space problems etc. It can be applied to cases where it can not be scolded According to the sixth aspect of the invention, since the taper blade is provided following the straight blade, it is possible to carry out the cutting process only with the straight blade, or to carry out the smooth processing using both the straight blade and the taper blade. Depending on the processing conditions, etc., where the degree of freedom of processing is high, the aspect of force can be changed.
[0018] 第 6発明および第 7発明では、テーパ刃でさらい加工を行うことが可能で、めねじの 口元やおねじの端部にテーパ面を設けることができるため、例えば螺合が容易にな るなど面取りを施した場合と同様の効果が得られる。  In the sixth and seventh inventions, since it is possible to carry out the rework processing with the taper blade and to provide a tapered surface at the mouth of the female screw and the end of the male screw, for example, screwing is facilitated. The same effect as in the case of chamfering can be obtained.
図面の簡単な説明  Brief description of the drawings
[0019] [図 1]本発明の一実施例であるねじ切りカッターを説明する図で、（a)は正面図、 (b) はさらい刃の回転軌跡形状を拡大して示す図である。  FIG. 1 is a view for explaining a threading cutter according to an embodiment of the present invention, in which (a) is a front view, and (b) is an enlarged view showing a rotational locus shape of a scraper blade.
[図 2]図 1のねじ切りカッターを用いてめねじを切削加工する際のねじカ卩ェ方法の一 例を説明する図である。  FIG. 2 is a view for explaining an example of a screw cover method when cutting a female screw using the screw cutter of FIG. 1;
[図 3]図 2のねじ加工方法に従って加工されためねじの開口部の断面形状を説明す る図で、（a)はストレート刃の挿入量が IP以上の場合、（b)はストレート刃の挿入量が 0. 5P程度で不完全ねじ山が残る場合である。  [Fig. 3] Fig. 3 illustrates the cross-sectional shape of the screw opening because it is processed according to the screw processing method in Fig. 2. (a) shows the straight blade when the straight blade insertion amount is IP or more. This is the case where the insertion amount is about 0.5 P and incomplete thread remains.
[図 4](a)は図 3(a)のようにストレート刃でさらい加工が行われた場合のめねじ開口部 の断面形状を示す写真で、 (b)はねじ切り刃のみでめねじを切削加工する従来の場 合のめねじ開口部の断面形状を示す写真である。  [Fig. 4] (a) is a photograph showing the cross-sectional shape of the female screw opening in the case where the milling process is performed with a straight blade as shown in Fig. 3 (a). It is a photograph which shows the cross-sectional shape of the female screw opening part in the case of the conventional case to cut.
[図 5]本発明の他の実施例を説明する図で、図 1に対応する図である。  FIG. 5 is a view for explaining another embodiment of the present invention, which corresponds to FIG. 1.
[図 6]ねじ切り刃のみでめねじを切削加工する従来の場合にめねじ開口部に生じる 不完全ねじ山を説明する断面図である。  FIG. 6 is a cross-sectional view for explaining incomplete threading that occurs in a female screw opening in the conventional case of cutting a female screw with a screw cutting blade only.
符号の説明  Explanation of sign
[0020] 10、 50 :ねじ切りカッター 16 :ねじ切り刃 20 :凸条（凸部） 22 :ねじれ溝（ 溝） 30、 52 :さらい刃 32 :ストレート刃 34 :テーパ刃 40 :めねじ（ねじ） 42 :被加工物  10, 50: threading cutter 16: threading blade 20: convex strip (convex portion) 22: twist groove (groove) 30, 52: scraping blade 32: straight blade 34: taper blade 40: female screw (screw) 42 : Workpiece
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0021] 本発明のねじ切りカッターは、おねじおよびめねじの両方の切削加工に使用できる 。おねじを加工する場合は、円柱状のねじ素材 (被加工物）の軸心まわりに公転させ て外周面に切削加工を行いつつ、軸方向へリード送りすれば良い。めねじを加工す る場合は、被加工物に設けられた下穴内を中心線まわりに公転させて内周面に切削 加工を行いつつ、軸方向へリード送りすれば良い。 [0021] The threading cutter of the present invention can be used to cut both male and female threads. When machining a male screw, revolve around the axis of the cylindrical screw material (workpiece) The lead may be fed in the axial direction while cutting the outer peripheral surface. In the case of machining a female screw, the inside of the pilot hole provided in the workpiece may be revolved around the center line to cut the inner peripheral surface while the lead is sent in the axial direction.
[0022] 本発明のねじ切りカッターを軸心まわりに回転駆動するとともに、被カ卩ェ物に対して 公転させつつ軸方向へリード送りしてねじを切削加工する態様は、被加工物に対し て相対的なものであれば良ぐ必ずしもねじ切りカッター側だけを運動させる必要は ない。例えばねじ切りカッターを一定位置に保持したまま軸心まわりに回転駆動し、 被力卩ェ物をねじ切りカッターのまわりに偏心回転させたり、ねじ切りカッターの軸方向 へリード送りしたりしても良い。リード送りは、ねじ切りカッターを相対的に先端側へ前 進させるものでも、シャンク側へ後退させるものでも良い。  An aspect in which the screw cutter of the present invention is rotationally driven about the axis and the lead is fed in the axial direction while revolving the object to be machined to cut the screw is the method for cutting the workpiece. As long as it is relative, it is not necessary to move only the threading cutter side. For example, the screw cutter may be rotationally driven around an axis while holding the screw cutter in a fixed position, and the object to be loaded may be eccentrically rotated around the screw cutter or lead-fed in the axial direction of the screw cutter. The lead feeding may be to advance the screw cutter relatively to the tip side or to retract it to the shank side.
[0023] ねじ切り刃は、例えばめねじのねじ山の山頂（めねじの内径）やおねじのねじ山の 山頂 (おねじの外径)を含めて切削する総形切れ刃、すなわち凹凸形状の凹所も切 れ刃として機能するように構成されるが、凹凸形状の凸部でねじ溝部分のみを切削 加工し、下穴の内周面がそのままめねじのねじ山の山頂となり、円柱形状のねじ素材 の外周面がそのままおねじのねじ山の山頂となるものでも良い。  [0023] The screw cutter may be, for example, a general cutting blade that cuts including the crest of a female screw thread (inner diameter of a female screw) and a crest of a male screw thread (outside diameter of a male screw), The concave portion is also configured to function as a cutting blade, but only the screw groove portion is cut with the convex portion having the concavo-convex shape, and the inner peripheral surface of the pilot hole becomes the crest of the female screw thread as it is. The outer peripheral surface of the screw material of the above may be the crest of the male screw thread as it is.
[0024] ねじ切りカッターは、例えば高速度工具鋼や超硬合金等の工具材料にて構成され 、必要に応じて TiAlN、 TiN、 TiCN等の硬質被膜がコーティングされる。  The threading cutter is made of, for example, a tool material such as high-speed tool steel or cemented carbide, and is coated with a hard coating such as TiAlN, TiN, TiCN or the like as required.
[0025] さらい刃の軸方向寸法 Tは、少なくとも 0. 5P以上であれば良いが、第 4発明のよう に 1P以上であることが望ましぐ工作機械への取付誤差などを考慮すると、 1. 5P以 上が更に望ましい。第 3発明の軸方向寸法 F= 1Pは、凸部の中心からさらい刃の軸 方向寸法 Tを計った場合には、その軸方向寸法 T=0. 5Ρに対応する。したがって、 軸方向寸法 Fは、少なくとも 1P以上であれば良いが、 1. 5Ρ以上であることが望ましく 、 2Ρ以上が一層望ましい。  [0025] The axial dimension T of the cutting blade may be at least 0.5 P or more, but taking into consideration the mounting error to the machine tool that is desirably 1 P or more as in the fourth invention, 1 More desirable than 5P. The axial dimension F = 1P of the third invention corresponds to the axial dimension T = 0.5 T when the axial dimension T of the scraping blade is measured from the center of the convex portion. Therefore, the axial dimension F may be at least 1 P or more, preferably 1.5 1. or more, and more preferably 2Ρ or more.
[0026] 第 2発明は、工具に直接凸条ゃ溝を加工してねじ切り刃やさらい刃を設けるむくの ねじ切りカッターに関するものである力 他の発明の実施に際しては、工具本体とは 別体にねじ切り刃やさらい刃が設けられたチップを構成し、そのチップを工具本体に 一体的、或いは着脱可能に取り付けて使用するねじ切りカッターにも適用され得る。 ねじ切り刃が設けられたチップと、さらい刃が設けられたチップとを別体に構成するこ とちでさる。 The second invention relates to a solid threading cutter in which a convex groove and a groove are directly processed into a tool to form a threading blade and a cutting blade. Force In the practice of the other inventions, separate from the tool body The present invention can also be applied to a threading cutter which constitutes a tip provided with a threading blade or a scraping blade and the tip is integrally or removably attached to a tool body. Separate the tip with the threading blade from the tip with the scraping edge Tochiru.
[0027] 第 6発明では、ストレート刃に連続してテーパ刃が設けられている力 第 5発明の場 合ストレート刃のみであっても良い。第 6発明のさらい刃は、ストレート刃およびテーパ 刃の両方の軸方向寸法 Tが少なくとも 0. 5P以上であれば良いが、ストレート刃のみ でさらい加工を行うことができるようにする上で、ストレート刃のみの軸方向寸法 Tを 0  [0027] In the sixth aspect of the present invention, a straight blade is provided with a tapered blade continuously. In the case of the fifth aspect of the present invention, only the straight blade may be used. According to the sixth aspect of the present invention, it is sufficient that the axial dimension T of both the straight blade and the tapered blade is at least 0.5 P or more, but in order to be able to carry out machining with only the straight blade, the straight blade is straight. Axial dimension of blade only T 0
1 1
. 5P以上とすることが望ましぐ 1P以上とすることが一層望ましい。 . It is more desirable to use 5P or more 1P or more.
[0028] 第 7発明のテーパ刃の軸方向寸法 Tは、少なくとも 0. 5P以上であれば良いが、お ねじまたはめねじの全周に亘つてテーパ面を形成する上で 1P以上とすることが望ま しぐ 1. 5P以上とすることが一層望ましい。第 6発明のようにストレート刃に連続して テーパ刃を設ける場合も、そのテーパ刃のみの軸方向寸法 Tは 1P以上が望ましぐ The axial dimension T of the tapered blade according to the seventh invention may be at least 0.5 P or more, but should be 1 P or more to form a tapered surface over the entire circumference of a male screw or a female screw. It is more desirable to make it 1.5P or more. As in the sixth invention, even in the case where a taper blade is provided continuously to a straight blade, the axial dimension T of only the taper blade is desirably 1 P or more.
2  2
1. 5P以上が一層望ましい。  1. More desirable than 5P.
[0029] 上記ストレート刃およびテーパ刃は、何れも回転軌跡形状において直線で示される 力 回転軌跡形状において円弧状に湾曲するさらい刃、すなわち軸方向において径 寸法が非線形に変化しているさらい刃を設けることも可能である。 [0029] The straight blade and the tapered blade are both a straight blade in a rotational trajectory shape and a straight blade curved in a circular arc shape in a rotational trajectory shape, that is, a smooth blade whose diameter dimension changes nonlinearly in the axial direction. It is also possible to provide.
[0030] 第 8発明のように軸心まわりに複数のねじ切り刃が設けられている場合、さらい刃は 少なくとも一つのねじ切り刃に設けられれば良 、が、総てのねじ切り刃に設けることも 可能である。 [0030] When a plurality of screw cutters are provided around the axis as in the eighth invention, it is acceptable if the sharp blade is provided on at least one screw cutter, but it may be provided on all the screw cutters. It is.
[0031] 本発明のねじ切りカッターを用いてめねじを切削加工するねじカ卩ェ方法は、例えば (a)めねじをカ卩ェすべき被カ卩ェ物に対して前記ねじ切りカッターよりも大径の下穴を 加工する下穴加工工程と、 (b)前記ねじ切りカッターを前記下穴内に挿入した状態で 、軸心まわりの切削回転方向へ回転駆動しつつ、前記下穴内を公転させるとともに 軸方向へリード送りすることにより、その下穴の内周面にめねじを切削加工するととも に、少なくとも公転の半周以上で前記さらい刃によりめねじの口元にさらいカ卩ェを行う ねじ切削工程と、を有して行われる。おねじを加工する場合も、ねじ切りカッターを軸 心まわりの切削回転方向へ回転駆動しつつ、ねじ素材の軸心まわりに公転させるとと もに軸方向へリード送りすることにより、そのねじ素材の外周面におねじを切削加工 するとともに、少なくとも公転の半周以上で前記さらい刃によりおねじの端部にさらい 加工が行われるようにすれば良!、。不完全ねじ山を完全に無くして完全ねじ山のみ とするためには、さらい刃の軸方向寸法 Tが IP以上のねじ切りカッターを用いて、公 転の 1周以上に亘つてさら!/、力卩ェが行われるようにすれば良！、。 The screw cutting method for cutting and processing a female screw using the screw cutter according to the present invention is, for example, (a) larger than the above-mentioned screw cutter with respect to the object to be cut. (B) in the state in which the screw cutter is inserted into the pilot hole, while rotating and driving in the direction of cutting rotation about the axial center while revolving in the pilot hole By cutting the female screw on the inner peripheral surface of the pilot hole by feeding in the direction, and performing reciprocation on the mouth of the female screw with the reed blade at least at least half a circumference of revolution. , Is done. When machining an external thread, the threading cutter is driven to rotate in the cutting rotational direction around the axis, and while it is reciprocated around the axis of the thread material and leaded in the axial direction, the thread material It is good if the screw is machined on the outer peripheral surface and that the end of the external thread is machined by the above-mentioned cutting blade at least at least half a revolution of revolution. Complete thread only without complete thread In order to achieve this, it is better if a screw cutter with an axial dimension T of IP or greater is used to carry out over 1 or more revolutions! ,.
実施例  Example
[0032] 以下、本発明の実施例を、図面を参照しつつ詳細に説明する。  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図 1の (a)は、本発明の一実施例であるねじ切りカッター 10を説明する正面図で、こ のねじ切りカッター 10は、マシユングセンタ等の主軸に把持されるシャンク 12と、一 対のねじ切り刃 16が設けられた刃部 18とを、軸方向に一体に備えて 、るむくのカツ ターである。刃部 18の外周部には、形成すべきめねじ 40 (図 2参照）のねじ溝に対応 する断面形状のリードの無い凸条 20が軸方向にめねじ 40と同じピッチ Pで多数設け られており、その凸条 20を分断するように一対のねじれ溝 22が形成されることにより 、めねじ 40の断面形状に対応する凹凸形状のねじ切り刃 16がねじれ溝 22に沿って 設けられている。このねじ切りカッター 10は、シャンク 12側から見て右まわりに回転駆 動されることにより切削加工を行うもので、ねじれ溝 22は、その切削回転方向と同じ 右まわりにねじれているとともに、そのねじれ角は 5° 〜30° の範囲内で例えば 15 ° 程度である。また、一対のねじ切り刃 16は、めねじ 40のねじ山の山頂（めねじの内 径)を含めて切削する総形切れ刃で、凸条 20の間の溝部分 (凹凸形状の凹所)も切 れ刃として機能する。ねじ切りカッター 10は、超硬合金にて一体に構成されていると ともに、刃部 18の表面には T1A1Nの硬質被膜がコーティングされている。なお、この ねじ切りカッター 10を用いて、おねじを切削加工することも可能である。  FIG. 1 (a) is a front view illustrating a threading cutter 10 according to an embodiment of the present invention. The threading cutter 10 has a pair of a shank 12 held by a spindle such as a machining center and the like. The blade portion 18 provided with the screw cutter 16 is integrally provided in the axial direction to form a thin cutter. On the outer peripheral portion of the blade portion 18, a large number of reed-free ridges 20 having a cross-sectional shape corresponding to the screw groove of the female screw 40 (see FIG. 2) to be formed By forming a pair of twisting grooves 22 so as to divide the ridges 20, an uneven thread cutting blade 16 corresponding to the cross-sectional shape of the female screw 40 is provided along the twisting grooves 22. The threading cutter 10 performs a cutting process by being rotationally driven clockwise when viewed from the shank 12 side, and the twist groove 22 is twisted in the same clockwise direction as the cutting rotation direction and the twisting thereof The angle is, for example, about 15 ° within the range of 5 ° to 30 °. Further, the pair of screw cutting blades 16 are formed cutting edges that cut including the crest of the thread of the female screw 40 (inner diameter of the female screw), and the groove portion between the ridges 20 (concave recess) Also functions as a cutting blade. The threading cutter 10 is integrally formed of cemented carbide, and the surface of the blade portion 18 is coated with a hard coating of T1A1N. It is also possible to cut an external thread using this threading cutter 10.
[0033] 上記刃部 18のシャンク 12側には、ねじ切り刃 16の凸条 20の頂の外径と同じ外径 寸法で円柱形状の円筒部 24が設けられている。この円筒部 24は、凹凸形状のねじ 切り刃 16のうち最もシャンク 12側に位置する凸部すなわち凸条 20の頂に連続して 設けられている。また、シャンク 12は円筒部 24よりも大径で、円筒部 24とシャンク 12 との間には、シャンク 12側へ向力 に従って大径となるテーパ部 26が設けられている 。そして、それ等の円筒部 24およびテーパ部 26には、前記一対のねじれ溝 22から 所定の逃げ角で二番取り加工が施されることにより、そのねじれ溝 22に沿ってさらい 刃 30が形成されている。逃げ角は、 6° 〜15° の範囲内で、例えば 10° 程度であ る。 [0034] 図 1の (b)は、ねじ切り刃 16およびさらい刃 30の回転軌跡形状、すなわちねじ切り 刃 16およびさら 、刃 30の軸方向における軸心 Sからの径寸法変化を示す拡大図で 、さらい刃 30は、径寸法が一定のストレート刃 32と、シャンク 12側へ向力うに従って 径寸法が大きくなるテーパ刃 34とを備えている。ストレート刃 32は、前記円筒部 24に 設けられた部分で、テーパ刃 34は、前記テーパ部 26に設けられた部分であり、テー パ刃 34は軸心 Sに対して 30° 〜60° の範囲内で例えば 45° 程度の角度で直線的 に傾斜させられている。 On the shank 12 side of the blade portion 18, a cylindrical cylindrical portion 24 having the same outer diameter as the outer diameter of the top of the ridge 20 of the threading blade 16 is provided. The cylindrical portion 24 is provided continuously on the top of a convex portion, that is, a ridge 20 located closest to the shank 12 among the concave and convex shaped thread cutting blades 16. The shank 12 has a diameter larger than that of the cylindrical portion 24, and a tapered portion 26 is provided between the cylindrical portion 24 and the shank 12 so as to have a larger diameter in accordance with the force directed to the shank 12 side. Then, the cylindrical portion 24 and the tapered portion 26 are subjected to a second cutting process at a predetermined clearance angle from the pair of twist grooves 22 to form a reed blade 30 along the twist grooves 22. It is done. The clearance angle is, for example, about 10 ° in the range of 6 ° to 15 °. [0034] FIG. 1 (b) is an enlarged view showing a rotational trajectory shape of the threading blade 16 and the smoothing blade 30, ie, a diameter dimension change from the axial center S in the axial direction of the threading blade 16 and the blade 30; The blade 30 includes a straight blade 32 having a constant diameter and a tapered blade 34 having a diameter that increases as the force is directed to the shank 12. The straight blade 32 is a portion provided on the cylindrical portion 24, the tapered blade 34 is a portion provided on the tapered portion 26, and the taper blade 34 is 30 ° to 60 ° with respect to the axial center S. For example, it is inclined linearly at an angle of about 45 ° within the range.
[0035] そして、上記ストレート刃 32の軸方向寸法 Tは、めねじ 40のピッチすなわちねじ切  And, the axial dimension T of the straight blade 32 is the pitch of the female screw 40, that is, the threading
1  1
り刃 16の凹凸形状のピッチ Pに対して 1P以上で、例えば 1. 5P程度である。言い換 えれば、ねじ切り刃 16の凹凸形状のうち最もシャンク 12側に位置する凹所の中心か らストレート刃 32のシャンク 12側の端部までの軸方向寸法 Fは、 1. 5P以上で例えば 2P程度である。また、テーパ刃 34の軸方向寸法 Tは、ねじの全周に亘つてテーパ  The pitch P of the concave and convex shape of the cutting blade 16 is, for example, about 1.5 P at 1 P or more. In other words, the axial dimension F from the center of the recess located closest to the shank 12 in the concavo-convex shape of the screw cutter 16 to the end of the straight blade 32 on the shank 12 side is 1.5 P or more. It is about 2P. Also, the axial dimension T of the tapered blade 34 is tapered over the entire circumference of the screw.
2  2
面を形成する上で 1P以上であることが望ましぐさらい刃 30の全体の軸方向寸法 T は例えば 2. 5P程度である。  The overall axial dimension T of the cutting blade 30 which is preferably 1 P or more in forming the surface is, for example, about 2.5 P.
[0036] そして、このようなねじ切りカッター 10を用いてめねじ 40を切削加工する際には、先 ず、図 2の (a)に示すように、めねじ 40を加工すべき被加工物 42に対して、前記刃部 18よりも大径で且つめねじ 40の内径寸法より僅かに小さい径寸法の下穴 44を形成 する。図 2は、止り穴のめねじ 40をカ卩ェする場合で、下穴 44も底部を備えている。こ のように被力卩ェ物 42に対して下穴 44をカ卩ェする工程が下穴加工工程で、本実施例 では、ねじ切りカッター 10とは別のドリルやフライス等を用いて、切削加工により形成 する。 Then, when cutting the female screw 40 using such a threading cutter 10, first, as shown in (a) of FIG. 2, a workpiece to be machined with the female screw 40, 42 On the other hand, a pilot hole 44 having a diameter larger than the blade portion 18 and slightly smaller than the inner diameter of the female screw 40 is formed. FIG. 2 shows a case where a blind hole female screw 40 is to be inserted, and the lower hole 44 also has a bottom. As described above, the process of covering the pilot hole 44 with respect to the force receiving object 42 is the piloting process, and in the present embodiment, cutting is performed using a drill or milling cutter other than the threading cutter 10. Form by processing.
[0037] 次に、図 2の (b)に示すように、マシユングセンタ等の 3次元カ卩ェ機の主軸に取り付 けられたねじ切りカッター 10を前記下穴 44の軸心 Oに沿って下穴 44内に挿入し、 (c) に示すように、ねじ切りカッター 10を軸心まわりに回転駆動しつつ、約 90° のァプロ ーチ範囲で軸方向へリード送りしながら下穴 44の内周面に滑らかに食い付力せる。 そして、その状態で (d)に示すように、ねじ切りカッター 10を軸心まわりに回転駆動し つつ、下穴 44の軸心 Oまわりに 180° 公転させるとともに、めねじ 40の 1ピッチ Pだけ 軸方向へリード送りすることにより、目的とするめねじ 40を切削加工する。本実施例 では、ねじ切りカッター 10を左まわりに公転させるとともに、 1ピッチ P分だけシャンク 1 2側へ後退させることにより、右ねじのめねじ 40を切削加工する。その後、（e)に示す ように 90° のリリース範囲でねじ切りカッター 10をリード送りしながら滑らかに下穴 44 の内周面力 離間させて軸心 Oまで戻し、 (Dに示すように軸心 Oに沿って引き抜くこ とにより、一連のねじ切削加工が終了する。この図 2の (b)〜(!）に示す一連の加工ェ 程がねじ切削工程である。 Next, as shown in (b) of FIG. 2, the threading cutter 10 attached to the main shaft of a three-dimensional machine such as a machining center is placed along the axial center O of the pilot hole 44. Insert into the pilot hole 44, and as shown in (c), while rotationally driving the threading cutter 10 around the axis, lead feeding axially through an approach range of about 90 ° while feeding the lead through the pilot hole 44. Smoothly bites on the inner surface. Then, in this state, as shown in (d), the screw cutter 10 is rotationally driven about the axial center, and it revolves 180 ° around the axial center O of the pilot hole 44 and only one pitch P of the female screw 40 The target female screw 40 is cut by feeding the lead in the direction. Example In this case, the right-handed female screw 40 is cut by rotating the screw cutter 10 leftward and retracting it to the shank 12 side by one pitch P. After that, as shown in (e), while feeding the threading cutter 10 in the 90 ° release range, the inner circumferential surface force of the pilot hole 44 is smoothly separated and returned to the axial center O, (as shown in D A series of screw cutting processes are completed by pulling out along O. A series of machining processes shown in (b) to (!) Of FIG.
[0038] ここで、本実施例では、図 2の (b)におけるねじ切りカッター 10の挿入時に、前記さ ら!、刃 30のストレート刃 32の略全域が下穴 44内に挿入されるようになって!/、る。これ により、図 2の (c)〜(d)でねじ切削加工が行われる際に、めねじ 40の開口部すなわ ち口元には、その全周に亘つてストレート刃 32によりめねじ 40の谷径寸法で座ぐり状 のストレート穴 46が形成されるとともに、そのストレート穴 46の内部（下方）に、完全な ねじ山形状のめねじ 40が形成される。ストレート穴 46の深さ寸法は、最大で前記軸 方向寸法 Tであり、ねじ切りカッター 10のリード送りにより全周で 1ピッチ P分だけ浅く Here, in the present embodiment, substantially the entire area of the straight blade 32 of the blade 30 is inserted into the pilot hole 44 when the threading cutter 10 in FIG. 2 (b) is inserted. It is! As a result, when screw cutting is performed in (c) to (d) of FIG. 2, the opening of the female screw 40, that is, the mouth of the female screw 40 is straightened with the straight blade 32 over the entire circumference. A counterbore-shaped straight hole 46 with a valley diameter is formed, and a complete thread-shaped internal thread 40 is formed inside (below) the straight hole 46. The depth dimension of the straight hole 46 is the axial dimension T at the maximum, and the lead feed of the threading cutter 10 makes it shallow by 1 pitch P all around.
1  1
なる。  Become.
[0039] 図 3の (a)は、めねじ 40の開口部に設けられたストレート穴 46部分を拡大して示す 断面図である。また、図 4の (a)は、以下の加工条件で上記と同様にしてねじ切削加 ェを行った場合のめねじの断面形状を示す写真で、図 3の (a)に対応し、〇印を付し た開口部分にストレート穴が形成される。図 4の (b)は、従来品で加工した場合、言い 換えれば本実施例のねじ切りカッター 10において、下穴 44内にさらい刃 30を挿入 することなく、ねじ切り刃 16のみでねじ切削加工を行った場合で、〇印を付しためね じの開口部（口元）には、図 6の (a)に示す不完全ねじ山 62と同様の不完全ねじ山が 生じる。  FIG. 3 (a) is a cross-sectional view showing a portion of the straight hole 46 provided in the opening of the female screw 40 in an enlarged manner. 4 (a) is a photograph showing the cross-sectional shape of the female screw when screw cutting is performed in the same manner as above under the following processing conditions, corresponding to (a) in FIG. A straight hole is formed in the marked opening. Fig. 4 (b) shows the case of processing with the conventional product. In other words, in the threading cutter 10 of this embodiment, thread cutting is performed with only the threading blade 16 without inserting the cutting blade 30 in the pilot hole 44. In the case where it is carried out, an incomplete thread similar to the incomplete thread 62 shown in (a) of FIG. 6 is generated at the opening (mouth) of the screw with a circle mark.
(加工条件）  (Processing conditions)
•被削材： S45C CFIS；機械構造用炭素鋼）  • Work material: S45C CFIS; Carbon steel for machine structure
-ェ具径： 9. 27mm  Tool diameter: 9. 27 mm
•加工めねじサイズ： M12 X 1. 5  • Machined thread size: M12 x 1.5
[0040] なお、前記図 2(c)のアプローチでストレート刃 32によりさらい加工が行われることに より、めねじ 40のねじ山の端末には約 90° の角度範囲で徐々に高さが低くなるスロ ープが設けられる。このスロープは、ねじ山の高さが低くなるだけで、幅寸法は正規 のねじ山と同じであり、幅寸法が小さくなる前記図 6(a)の不完全ねじ山 62とは相違し 、螺合する際に潰れたり欠けたりする恐れはない。前記図 4の (a)には、上記スロープ 部分が写されている。 Note that, by performing the re-shaping process with the straight blade 32 by the approach shown in FIG. 2 (c), the height of the screw thread end of the female screw 40 is gradually lowered within an angle range of about 90 °. Suro A loop is provided. This slope has the same width dimension as a normal thread but only a low thread height, and differs from the incomplete thread 62 shown in FIG. 6 (a) in which the width dimension is reduced. There is no risk of crushing or chipping. The slope portion is shown in FIG. 4 (a).
[0041] また、図 2の (b)の挿入時にテーパ刃 34まで下穴 44内に挿入されるようにすれば、 そのテーパ刃 34によりめねじ 40の開口部、具体的には前記ストレート穴 46の開口部 に、テーパ面を設けることができる。テーパ刃 34が 1P以上下穴 44内に挿入されるよ うにすれば、めねじ 44の開口部の全周にテーパ面を設けることができる。  Further, when the tapered blade 34 is inserted into the pilot hole 44 at the time of insertion in (b) of FIG. 2, the opening portion of the female screw 40 by the tapered blade 34, specifically, the straight hole A tapered surface may be provided at the 46 opening. If the taper blade 34 is inserted into the pilot hole 44 by 1 P or more, a taper surface can be provided on the entire circumference of the opening of the female screw 44.
[0042] このように、本実施例のねじ切りカッター 10においては、ねじ切り刃 16の凹凸形状 のうち最もシャンク 12側に位置する凸部に連続して、軸方向寸法 Tがねじのピッチ P に対して 2. 5P程度のさらい刃 30が設けられているため、公転時にそのさらい刃 30 まで使ってめねじ 40の切削加工が行われるようにすれば、そのめねじ 40の口元に形 成される不完全ねじ山 62 (図 6(a)参照）を完全に無くすことができる。このため、めね じ 40を螺合する際にねじ山同士が食い付 、て不完全ねじ山部分が潰れたり欠けたり する恐れが解消し、ねじ込み不良などの問題が発生することが抑制される。  As described above, in the threading cutter 10 according to the present embodiment, the axial dimension T with respect to the pitch P of the screw is continuous to the convex portion located closest to the shank 12 among the concavo-convex shapes of the threading blade 16. Since a reed blade 30 of about 5 P is provided, it is formed at the mouth of the female screw 40 if cutting of the female screw 40 is performed by using the reed blade 30 at the time of revolution. Incomplete thread 62 (see Fig. 6 (a)) can be completely eliminated. As a result, when screwing together the screws 40, there is no risk that the screw threads will bite each other and the incomplete thread portion will be crushed or chipped, and problems such as screwing in can be suppressed. .
[0043] また、本実施例では軸方向寸法 Tが 1. 5P程度のストレート刃 32を備えているた  In the present embodiment, the straight blade 32 having an axial dimension T of about 1.5 P is provided.
1  1
め、前記図 2のようにさら!/、刃 30のうちストレート刃 32のみを用いてさら!/、加工が行わ れるようにすれば、めねじ 40を切削加工する場合に必要最小限のスペースでさらい 加工を行うことが可能であり、スペース上の問題などで口元をテーパ状にさらうことが できない場合にも適用できる。  If, as in Figure 2 above, machining is performed using only the straight blade 32 of the blade 30, the space necessary for cutting the female screw 40 is minimal. It is possible to carry out rough machining, and it can also be applied to cases where the mouth can not be tapered due to space problems.
[0044] また、本実施例では、ストレート刃 32に続いてテーパ刃 34が設けられているため、 ストレート刃 32のみでさらい力卩ェを行うこともできるし、ストレート刃 32およびテーパ刃 34の両方を用いてさらい力卩ェを行うこともできるなど、さらい加工の自由度が高ぐ加 ェ条件などに応じてさらい加工の態様を変更できる。  Further, in the present embodiment, since the tapered blade 34 is provided following the straight blade 32, the repelling force can be performed only with the straight blade 32, and the straight blade 32 and the tapered blade 34 can be used. For example, it is possible to use both of them, and it is possible to change the mode of the machining according to the welding conditions and the like, where the degree of freedom of the machining is high.
[0045] また、ストレート刃 32およびテーパ刃 34の両方を用いてさらい加工が行われるよう にすれば、めねじ 40の口元にテーパ面を設けることができるため、螺合が容易になる など面取りを施した場合と同様の効果が得られる。  Also, if quick cutting is performed using both the straight blade 32 and the tapered blade 34, a tapered surface can be provided at the mouth of the female screw 40, which facilitates screwing, etc. The same effect as in the case of applying
[0046] なお、前記さらい刃 30の軸方向寸法 Tは 2. 5P程度であり、めねじ 40の開口部の 全周にさらい加工を施すことにより、不完全ねじ山を完全に無くすことができる力 例 えば軸方向寸法 Tが 0. 5P程度のストレート刃 32のみ力も成るさらい刃 30を設けるこ とも可能である。すなわち、前記ねじ切りカッター 10において、前記図 2の (b)の挿入 時にストレート刃 32を約 0. 5P分だけ下穴 44内に挿入して (c)〜(d)に示すようにね じ切削加工を行った場合と同様の作用効果が得られ、めねじ 40の開口部の半周部 分にストレート刃 32によりストレート穴 46が形成されるだけで、残りの半周部分では図 3の (b)に示すように一部が切り欠かれた不完全ねじ山 48が形成される。しかしなが ら、この不完全ねじ山 48の幅寸法 (軸方向寸法）は、最低でも完全ねじ山の 1Z2以 上で、山頂まで達しているため、前記図 6(a)の不完全ねじ山 62のように螺合の際に 潰れたり欠けたりする恐れはなぐ前記実施例と同様にねじ込み不良等の問題が発 生することが抑制される。 The axial dimension T of the scraping blade 30 is about 2.5 P, and the opening portion of the female screw 40 is By applying a rounding process to the entire circumference, it is possible to provide a smooth blade 30 which can eliminate the incomplete thread completely, for example, a straight blade 32 having an axial dimension T of about 0.5 P. . That is, in the screw cutter 10, the straight blade 32 is inserted into the pilot hole 44 by about 0.5 P when inserting (b) in FIG. 2 and screw cutting is performed as shown in (c) to (d). The same action and effect as in the case of processing are obtained, and only the straight hole 46 is formed by the straight blade 32 in the half circumference of the opening of the female screw 40, and the other half circumference is shown in FIG. An incomplete thread 48 is formed which is partially cut away as shown in FIG. However, since the width dimension (axial direction dimension) of the incomplete thread 48 is at least 1Z2 or more of the complete thread and reaches the crest, the incomplete thread shown in FIG. 6 (a) can be obtained. As in the case of the above-mentioned embodiment, the occurrence of problems such as screwing defects can be suppressed as in the above-mentioned embodiment.
[0047] また、図 5は本発明の他の実施例を説明する図で、前記図 1に対応する図である。 FIG. 5 is a view for explaining another embodiment of the present invention, which corresponds to FIG.
このねじ切りカッター 50は、前記円筒部 24やストレート刃 32が無い場合で、凹凸形 状のねじ切り刃 16のうち最もシャンク 12側に位置する凸部すなわち凸条 20の頂に 連続してテーパ部 26が設けられているとともに、そのテーパ部 26に設けられたテー パ刃 34のみでさらい刃 52が構成されている。本実施例でも、軸方向寸法 Tを 1P以 上とすれば、めねじ 40の全周にテーパ面を設けることができるとともに、不完全ねじ 山 62 (図 6(a)参照)を完全に無くすことが可能で、前記実施例と同様の効果が得ら れる。  The threading cutter 50 has a tapered portion 26 continuously on the top of a convex portion, that is, a ridge 20 located closest to the shank 12 among the concave and convex thread cutting blades 16 without the cylindrical portion 24 and the straight blade 32. The reed blade 52 is constituted only by the taper blade 34 provided at the taper portion 26 thereof. Also in this embodiment, when the axial dimension T is 1 P or more, a tapered surface can be provided all around the female screw 40, and the incomplete thread 62 (see FIG. 6A) is completely eliminated. It is possible to obtain the same effect as the above embodiment.
[0048] 以上、本発明の実施例を図面に基づいて詳細に説明したが、これ等はあくまでも一 実施形態であり、本発明は当業者の知識に基づいて種々の変更、改良を加えた態 様で実施することができる。  Although the embodiments of the present invention have been described in detail with reference to the drawings, these are merely one embodiment, and the present invention is a mode in which various modifications and improvements are added based on the knowledge of those skilled in the art. Can be implemented by
産業上の利用可能性  Industrial applicability
[0049] 本発明のねじ切りカッターは、軸心まわりに回転駆動されるとともに被カ卩ェ物に対し て公転しつつ軸方向へリード送りされてねじを切削加工する際に、さらい刃の存在で めねじの口元やおねじの端部に小さな不完全ねじ山が生じることが防止され、そのよ うな小さな不完全ねじ山の存在でねじ込み不良等が生じる恐れが無いねじの切削加 ェに好適に用いられる。 The threading cutter according to the present invention is rotationally driven about its axis and reed in the axial direction while revolving with respect to the object to be machined, so that a cutting blade is present when cutting a screw. Prevents the occurrence of small incomplete threads at the mouth of the female thread and the end of the external thread, and is suitable for cutting screws that do not have the possibility of threading defects etc. due to the presence of such small incomplete threads. Used.

Claims

請求の範囲 The scope of the claims
[1] 形成すべきねじの断面形状に対応する凹凸形状のねじ切り刃を外周部に備え、軸 心まわりに回転駆動されるとともに被加工物に対して相対的に公転しつつ軸方向へ リード送りされることによりねじを切削加工するねじ切りカツタにおいて、  [1] A screw cutting blade with an uneven shape corresponding to the cross-sectional shape of the screw to be formed is provided on the outer peripheral part, and it is rotationally driven around its axis and reciprocates relative to the workpiece while moving in an axial direction In a threading cutter for cutting a screw by being
前記ねじ切り刃の凹凸形状のうち最もシャンク側に位置する凸部の頂力 該シャン ク側に連続する部分には、軸方向寸法 Tが前記ねじのピッチ Pに対して 0. 5P以上の さらい刃が、一定の径寸法乃至はシャンク側へ向力うに従って大径となるように設け られている  Of the concavo-convex shape of the threading blade, the peak force of the convex portion located most on the shank side in the portion continuing on the shank side, the axial dimension T relative to the pitch P of the screw Is provided so as to increase in diameter according to a certain diameter dimension or force toward the shank side.
ことを特徴とするねじ切りカッター。  A threading cutter characterized by
[2] 前記ねじ切り刃は、前記ねじのねじ溝に対応する断面形状のリードの無い複数の 凸条が外周部に設けられるとともに、該凸条を分断するように溝が形成されることによ り、該溝に沿って設けられており、 [2] The screw cutting blade is provided with a plurality of ridges without a lead having a cross-sectional shape corresponding to the screw groove of the screw on the outer peripheral portion, and the grooves are formed so as to divide the ridges. Provided along the groove,
前記さらい刃は、前記溝力 6° 〜15° の範囲内の逃げ角で二番取り加工が施さ れることにより、該溝に沿って形成されている  The scraper blade is formed along the groove by being subjected to a finishing process at a clearance angle within the range of the groove force of 6 ° to 15 °.
ことを特徴とする請求項 1に記載のねじ切りカッター。  The thread cutter according to claim 1, characterized in that.
[3] 前記ねじ切り刃の凹凸形状のうち最もシャンク側に位置する凹所の中心力 前記さ らい刃のシャンク側の端部までの軸方向寸法 Fは 1P以上である [3] The central force of the recess located closest to the shank in the concavo-convex shape of the threading blade The axial dimension F up to the shank end of the scraping blade is 1 P or more
ことを特徴とする請求項 1または 2に記載のねじ切りカッター。  The threading cutter according to claim 1 or 2, characterized in that:
[4] 前記さらい刃の軸方向寸法 Tは 1P以上である [4] The axial dimension T of the scraping blade is 1 P or more
ことを特徴とする請求項 1または 2に記載のねじ切りカッター。  The threading cutter according to claim 1 or 2, characterized in that:
[5] 前記さらい刃は、径寸法が一定で軸心まわりの回転軌跡形状において該軸心と平 行となるストレート刃である [5] The scraping blade is a straight blade that has a constant diameter and is parallel to the axial center in a rotational locus around the axial center
ことを特徴とする請求項 1〜4の何れか 1項に記載のねじ切りカッター。  The thread cutter according to any one of claims 1 to 4, characterized in that.
[6] 前記さらい刃は、前記ストレート刃に連続して前記シャンク側へ向力 に従って大径 となるテーパ刃を備えて 、る [6] The scraping blade is provided with a tapered blade which becomes larger in diameter in accordance with the force directed to the shank continuously to the straight blade.
ことを特徴とする請求項 5に記載のねじ切りカッター。  The threading cutter according to claim 5, characterized in that:
[7] 前記さらい刃は、前記シャンク側へ向かうに従って大径となり、軸心まわりの回転軌 跡形状において該軸心に対して 30° 〜60° の範囲内の角度で直線的に傾斜する テーパ刃である [7] The scraper blade becomes larger in diameter toward the shank side, and is linearly inclined at an angle within the range of 30 ° to 60 ° with respect to the axial center in a rotational trajectory shape about the axial center It is a taper blade
ことを特徴とする請求項 1〜4の何れか 1項に記載のねじ切りカッター。  The thread cutter according to any one of claims 1 to 4, characterized in that.
前記ねじ切り刃は軸心まわりに複数設けられているとともに、該複数のねじ切り刃の 少なくとも一つに前記さらい刃が設けられている  A plurality of the threading blades are provided around an axial center, and the scraping blade is provided on at least one of the plurality of threading blades.
ことを特徴とする請求項 1〜7の何れか 1項に記載のねじ切りカッター。  The thread cutter according to any one of claims 1 to 7, characterized in that:
PCT/JP2005/021920 2005-11-29 2005-11-29 Screw thread cutter WO2007063578A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/021920 WO2007063578A1 (en) 2005-11-29 2005-11-29 Screw thread cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/021920 WO2007063578A1 (en) 2005-11-29 2005-11-29 Screw thread cutter

Publications (1)

Publication Number Publication Date
WO2007063578A1 true WO2007063578A1 (en) 2007-06-07

Family

ID=38091919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/021920 WO2007063578A1 (en) 2005-11-29 2005-11-29 Screw thread cutter

Country Status (1)

Country Link
WO (1) WO2007063578A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01502012A (en) * 1987-01-27 1989-07-13 ターチャン，マニュエル・シー Combined hole making and threading tool
JPH0639643A (en) * 1992-07-24 1994-02-15 O S G Kk Drilling and threading joint tool
JPH0611923U (en) * 1992-07-15 1994-02-15 オーエスジー株式会社 Perforated threading coupling tool for through holes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01502012A (en) * 1987-01-27 1989-07-13 ターチャン，マニュエル・シー Combined hole making and threading tool
JPH0611923U (en) * 1992-07-15 1994-02-15 オーエスジー株式会社 Perforated threading coupling tool for through holes
JPH0639643A (en) * 1992-07-24 1994-02-15 O S G Kk Drilling and threading joint tool

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