WO2018091495A1 - Procédé et outil de fraisage destiné à la réalisation d'une cavité dans une pièce aux fins de la réception d'une pointe de centrage - Google Patents

Procédé et outil de fraisage destiné à la réalisation d'une cavité dans une pièce aux fins de la réception d'une pointe de centrage Download PDF

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Publication number
WO2018091495A1
WO2018091495A1 PCT/EP2017/079262 EP2017079262W WO2018091495A1 WO 2018091495 A1 WO2018091495 A1 WO 2018091495A1 EP 2017079262 W EP2017079262 W EP 2017079262W WO 2018091495 A1 WO2018091495 A1 WO 2018091495A1
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WIPO (PCT)
Prior art keywords
centering
workpiece
rotation axis
tool
section
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Application number
PCT/EP2017/079262
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German (de)
English (en)
Inventor
Stefan Scherbarth
Original Assignee
Technische Hochschule Deggendorf
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 Technische Hochschule Deggendorf filed Critical Technische Hochschule Deggendorf
Priority to EP17798194.1A priority Critical patent/EP3541554A1/fr
Publication of WO2018091495A1 publication Critical patent/WO2018091495A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/02—Milling surfaces of revolution
    • B23C3/04—Milling surfaces of revolution while revolving the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
    • B23B49/04—Devices for boring or drilling centre holes in workpieces

Definitions

  • the invention relates to a method for the end machining of workpieces with centric, rotationally symmetrical surfaces, in particular end faces, such as shafts, and the associated tool for machining.
  • cavities for receiving revolving centering tips for a turning operation are produced.
  • the cavity is not a hole with a circular cross-section and is not manufactured by drilling, but produced by a milling process, are aligned in the workpiece and tool axis not parallel to the axis.
  • a method for producing a center hole according to the preamble of claim 1 is known for example from DE 3408210 C1 or from US 5,135,810 A.
  • Centering tips are mainly used in lathes to support long, slender workpieces to reduce the bending of the workpiece by the cutting forces or to eliminate the risk of hitting due to a possibly existing workpiece unbalance.
  • a center hole is drilled in the end face of the workpiece according to the prior art.
  • the axis of rotation of the tool and the axis of rotation of the workpiece are aligned in principle.
  • a conical centering tip is moved into the partially conical centering hole, which then supports the workpiece or intercepts the process forces.
  • follower centering tips are used, which allow high speeds for turning by the rolling bearing of the centering cone.
  • centering holes with centering drills corresponds to the state of the art. Both the various forms of centering holes as well as the required for their production center drill are standardized. In addition, the geometry of the centering tips used is also standardized. Centering bores for holding centering points for turning are standardized in DIN 332: ⁇ DIN 332-1: 1986-04: centering holes 60 °; Forms R, A, B and C ⁇ DIN 332-4: 1990-06: Centering holes for wheel set shafts of rail vehicles ⁇ DIN 332-7: 1982-09: Machine tools; Center holes 60 °; Determination procedure ⁇ DlN 332-8: 1979-09: Centering holes 90 °, Form S; Dimensions, determination method ⁇ DIN 332-2: 1983-05: Center holes 60 ° with thread for shaft ends electrical
  • Centering holes The centering drills for standardized centering holes are also standardized: ⁇ DIN 333: 1986-04: Center drill 60 °; Forms R, A and B ⁇ lSO 866: 1975-02: Centering drill for centering holes without counterbore; Form n ⁇ lSO 2540: 1973-04: Centering drill for centering holes with countersink; Form B ⁇ ISO 2541: 1972-12: Center drill for center drill.
  • centering tips are also standardized: ⁇ DIN 806: 1971-02: Centering tips 60 ° without forcing nut ⁇ DIN 807: 1966-11: Centering tips 60 ° with forcing nut ⁇ DlN 8012: 1972-05: Carbide inserts for centering tips ⁇ ISO 298 : 1973-42: Centering points, connection dimensions Centering holes have a circular cross-section, are rotationally symmetrical and are produced by drilling, whereby both stationary and rotating tools can be used.
  • rotationally symmetrical is to be understood as follows: a body or partial surfaces of a body are rotationally symmetric when a straight line, the so-called axis of rotation, exists and by any angular rotation around this line the body or the partial surfaces of the body are imaged on themselves. If higher demands are placed on the accuracy of the centering hole, the centering holes are additionally ground.
  • the production of centering holes with centering drills corresponds to the prior art; Accordingly, the patent applications in the last 20 years either focus on devices for centering complex components or embodiments of center drills. For example, patent DE 4123859 C2 to Gebr.
  • a classic CNC lathe is understood to mean a lathe in which the tools are engaged by means of one or more tool turrets. On classic CNC lathes is powered by a Unit on the tool turret the center hole made using standard tools. During the manufacturing process, the axes of the center hole and the center drill must be in line with the principle.
  • Another premise for making the center hole in this way is sufficient space between the shaft end and the center point, so that the driven unit can be moved with the center drill to a position in front of the shaft center.
  • the prerequisite is, of course, that the lathe has a driven revolver with the necessary driven unit, which is equipped with the corresponding center drill.
  • this type of center hole production was still an option on classic CNC lathes, the processing situation has changed dramatically with the increasing spread of turning centers.
  • the milling spindle integrated in the B-axis head is preferred for the production of centering holes.
  • the milling spindle offers the advantage of an automatic tool change and has a multiple of the stability and drive power of a driven unit on a conventional lathe.
  • the component can be supported with the bottom turret while the center hole is drilled with the milling spindle.
  • the process of making the center hole by means of the milling spindle of the B-axis head offers a number of advantages in turning milling centers.
  • there is also a decisive disadvantage associated with the method Due to the fact that the B-axis head and the centering drill have to be positioned between the centering point and the workpiece, the maximum possible component length is shortened significantly.
  • the workpiece for machining, in particular rotating, machining is rotatable about a workpiece axis of rotation.
  • the centering recess is thus not rotationally symmetrical about the workpiece axis of rotation introduced into the end face.
  • the centering recess is introduced by means of a milling tool in the end face. It is provided that a tool rotation axis about which rotates the milling tool for introducing the centering, is bent to the workpiece axis of rotation by a predefined angle ⁇ .
  • the workpiece does not rotate about the workpiece axis of rotation during the introduction of the centering recess.
  • the centering recess is formed by at least two intersecting cuts.
  • the cuts are each introduced by the milling tool in the end face. After inserting a cut, the orientation of the milling tool remains unchanged, only the workpiece is rotated by a predetermined angle. Thus, a further cut can be made in the end face of the workpiece by the milling tool in order to realize the intersecting cuts.
  • more than two intersecting cuts can be used to create the centering recess.
  • the centering recess is generated by two by an angle between 80 ° and 100 °, in particular by 90 °, offset milling cuts.
  • the workpiece which is preferably clamped in a chuck of the main spindle or secondary spindle of a rotary milling center, is rotated by 90 ° along the workpiece rotation axis.
  • the production is possible with a deviating from 90 ° rotation of the workpiece between the milling cuts.
  • the first section has a first envelope surface, while the second section has a second envelope surface. Under envelope surfaces are those surfaces of the workpiece to understand, which have arisen only by introducing the centering recess.
  • the centering recess has a lower Partial surface of a first section and an upper partial surface of a first section.
  • the lower partial surface of the first section and the upper partial surface of the first section advantageously result in the first envelope surface.
  • the centering recess has a lower partial surface of a second section and an upper partial surface of a second section.
  • the upper part surface of the second cut and the lower part surface of the second cut advantageously result in the second envelope surface.
  • a centering tip can be applied to these support edges in order to center the workpiece during the rotary machining.
  • the support edges are formed axially symmetrical about the workpiece rotation axis and / or have the support edges with respect to the workpiece rotation axis at an angle of half a cone angle of a centering tip to be used and / or cut the workpiece rotation axis in a common point of intersection.
  • the angle to the workpiece rotation axis ⁇ is between 30 ° and 45 °.
  • a tool rotation axis of the milling tool about which rotates the milling tool during insertion of the centering, at an angle between 60 ° and 80 ° and in particular at an angle of 67.792346 ° or 73.601655 ° rotated to the workpiece rotation axis.
  • a production of the centering recess is possible when the tool axis of the cutter and the workpiece rotation axis intersect at an angle of up to 90 °, which may also be advantageous for lathes with driven units on the revolver in tight spaces.
  • the centering recess has a non-rotationally symmetrical shape.
  • the angle between the workpiece rotation axis and the tool rotation axis has an angle smaller than 90 ° during the manufacture of the centering recess. If the angle between the workpiece rotation axis and the tool rotation axis is 90 ° during the manufacture of the centering recess, the centering recess has, in particular, a non-rotationally symmetrical shape.
  • the term "rotationally symmetrical” is to be understood as follows: a body or partial surfaces of a body are rotationally symmetrical when the body or the partial surfaces of the body have more than one plane of symmetry. The so-called rotation axis is formed by the intersection of the symmetry planes.
  • the centering recess is particularly preferably shaped so that there is a line contact between the workpiece and centering. Such a line contact comes about in particular when the workpiece rotation axis and a longitudinal axis of the conical centering point are aligned.
  • an optimized centering tip can be used whose contour fits into the centering recess.
  • the method provides, at least in one of the described embodiments, compared to the use of a conventional center drill for producing a center hole in a rotary milling center the following advantages: ⁇
  • the maximum workpiece length, which can be provided with a centering, increases significantly, since no longer the entire B -Axis head including tool holder and center drill must be positioned in front of the workpiece.
  • ⁇ The use of existing live centering tips is possible without restrictions.
  • a revolving centering tip can be used both for standard centering bores conventionally made by means of centering drills and in combination with centering cavities which are produced by means of the method proposed here.
  • the invention also relates to a milling tool for introducing a centering recess in an end face of a workpiece. It is provided that a conical centering tip can be introduced into the centering recess in order to fix the workpiece, in particular during a machining operation.
  • the workpiece has a workpiece rotation axis while the milling tool has a tool rotation axis.
  • the milling tool is rotationally symmetrical about the tool rotation axis.
  • the milling tool has at least one upper main cutting edge.
  • the upper main cutting edge merges into a lower main cutting edge or a secondary cutting edge.
  • the milling tool for producing the centering cavity must have a specific contour. Assuming that the centering cavity is to be produced with two sections offset by 90 °, the following mathematical description of the outer contour of the upper main cutting edge and, in particular, of the lower main cutting edge follows: contour of the lower main cutting edge, described by the coordinate
  • ⁇ is the half cone angle of a cone-shaped centering tip intended for use with the centering recess
  • ⁇ is the predefined angle between the tool rotation axis and the workpiece rotation axis during insertion of the centering recess
  • r c is an upper limit of the radius of the milling tool is, wherein this upper limit of the radius is preferably not reached, in particular as a rounding between the upper main cutting edge and the lower main cutting edge is present.
  • the upper limit would only be achieved if the upper main cutting edge and the lower main cutting edge were pointed towards each other.
  • the milling tool has only the upper main cutting edge and instead of the lower main cutting edge a secondary cutting edge.
  • An upper main cutting edge and a lower main cutting edge or a minor cutting edge preferably form a tooth of the milling tool.
  • the milling tool preferably has at least two teeth, which are arranged in particular rotationally symmetrical about the tool rotation axis. If, in particular, a reduced depth of the centering recess is permissible, the milling tool can comprise a simpler tool contour comprising straight cutting edges be approximated.
  • Tool rotation axis is approximately calculated for this fail as follows: Setting angle of the lower main cutting edge
  • ⁇ 90 ° for the use of the milling system on lathes with a driven turret and a straight driven unit.
  • ⁇ 67.792346 ° for milling cutters with a tool geometry that is determined only by the contour so that the tool cuts only
  • the router can be made easier.
  • Milling tools with standard turning plates with V-shape according to ISO 1832 This is particularly advantageous when a reduced cutting depth for forming the centering recess is allowed.
  • the centering recess is made by a linear traversing movement in the plane which is spanned by the tool rotation axis and the workpiece rotation axis.
  • the contour of the cutting edges of the milling tool is in this case imaged directly in the section of the workpiece.
  • the centering recess can also be generated by semicircular circular milling on an oblique plane. In this case is to correct the outer contour of the milling tool by the radius of the movement r f .
  • the radius of the travel motion r f must be subtracted.
  • the use of the centering recess described also allows the torque transmission to the workpiece if a correspondingly contoured centering tip is used. This can be dispensed with the use of classic Stirnmit viden.
  • the shape of the contoured center point resembles the shape of the centering recess. However, it is designed so that when pressing the contoured centering a surface contact between the centering and the contoured centering arises; a contact in the bottom of the centering recess is particularly avoided.
  • This embodiment of the centering tip can also be used to increase the carrying capacity over the use of a classic cone-shaped centering tip.
  • the invention thus finally relates to a centering tip.
  • the centering tip is used to engage in a centering recess, wherein the centering recess is made by a method as described above and / or by a milling tool as described above.
  • the centering tip has a plurality of wings. The wings can be brought into surface contact with the centering recess when a center axis of the centering is aligned with the workpiece rotation axis.
  • the centering tip can rotate the workpiece, in particular to allow machining by turning.
  • the tools for the production of the centering recess can be produced without restrictions from the typical cutting materials for form cutters tool steel, HSS and carbide. Depending on the material to be machined, milling tools with and without additional coating can be used.
  • the number of teeth can be varied within wide limits depending on the cutter diameter, the material to be machined and the cutting material used for the tool. Embodiments with a number of teeth between 1 and 20 are preferred.
  • milling tools with numbers of teeth between 3 and 8 are particularly preferred.
  • the cutting edges can be made helical. This embodiment offers an advantageous cutting behavior over the straight-edged version with an inclination angle of 0 ° (straight grooved cutters).
  • the tools with cylindrical shank are preferably designed according to DIN 1835 Form A or DIN 6535 Form HA.
  • the upper major cutting edge and lower major cutting edge which are defined in accordance with equations 1 to 8, are connected to each other by either a small corner radius or a chamfer.
  • the corner radius or bevel are made very small in order to achieve the greatest possible depth of the centering recess.
  • corner radii r e between 0.1 and 0.4 mm are used.
  • the execution of the milling tool for producing the centering recess is basically possible in the form of a grinding pin.
  • the contour of the active cutting part of a corresponding grinding pin corresponds here to the contour of the milling tool and is defined according to the formulas 1 to 8.
  • the method described and claimed in the preceding sections and the tools to be used according to the invention shown in the exemplary embodiments are not subject to special exceptions in their size, design with the exception of the contour of the active cutting part, material selection and technical design, so that the selection criteria known for machining are unrestricted Application can be found. Further details, advantages and features of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing. 1 shows a production of a centering hole in a rotary milling center according to the
  • Figure 2 shows a production of a centering cavity according to a method according to a
  • Embodiment of the invention in a rotary milling center by means of B-axis head and the milling tool provided for this purpose 3 shows a milling tool according to a first embodiment of the invention for the production of the centering cavity with upper and lower main cutting edge,
  • Figure 4 shows a milling tool according to a second embodiment of the invention for
  • Figure 5 shows the position of the milling tool according to the first embodiment of
  • Figure 6 shows the position of the milling tool according to the second embodiment of the
  • FIG. 7 shows a schematic detail of the contour of the milling tool according to the first exemplary embodiment of the invention for producing a centering cavity with upper and lower main cutting edges
  • FIG a schematic detail of the contour of the milling tool according to the second embodiment of the invention for producing a centering cavity with upper main cutting and minor cutting
  • Figure 9 is a schematic plan view of an end face of a workpiece with a partially manufactured centering cavity, wherein a first cut was performed 10 shows a schematic plan view of an end face of a workpiece with a partially produced centering cavity, with a second cut being made, and without the first cut being shown
  • FIG. 11 a schematic illustration of one with a centering cavity provided
  • FIG. 12 shows a further schematic illustration of a centering cavity provided with a centering cavity
  • FIG. 13 is a schematic end view of a contoured centering tip according to a
  • Embodiment of the invention and Fig.14 is a schematic view of the contoured centering according to the
  • Fig. 1 shows the machine situation in the production of a center hole in a rotary milling center 90 by means of a centering drill 61.
  • the centering drill 61 is above a Chuck 62 for the center drill 61 attached to a B-axis head 63.
  • Fig.1 shows the prior art.
  • the rotary milling center 90 comprises a main spindle stock 57 with a main spindle 58, a workpiece 54 being fastened to the main spindle 58 via a first power chuck 59.
  • the workpiece 54 is rotatable about a workpiece rotation axis 18 in order to rotate the workpiece 54.
  • the rotary milling center 90 also comprises a secondary spindle stock 66 with a secondary spindle 65.
  • a second power chuck 64 in particular can be used to clamp a centering tip 79 (see Figures 13 and 14) in order to support the workpiece 54 during a rotary machining operation.
  • the workpiece 54 is located between a side spindle side panel 67 and a main spindle side panel 56.
  • the length of the B-axis head l B 83 is exemplarily 545 mm, which length is dependent on the machine type and manufacturer.
  • FIG. 1 shows the machine situation during the production of the centering cavity 80 proposed according to the invention by means of a milling tool 87.
  • FIG. 2 illustrates that, for the production of the centering cavity 80, it is no longer necessary to move the entire B axis head 63 between the workpiece 54 and the chuck of the secondary spindle 64; it is sufficient if the milling tool 87 and a possibly necessary tool holder fit into the gap l F 86. This results in comparison to the classical production of centering holes, as shown in Fig.
  • the milling tool 87 is preferably a profiled milling cutter.
  • the Profilschaftfräser with cylindrical shaft 1 has an upper main cutting edge 4, which is connected by a transition radius 5 with a lower main cutting edge 6.
  • the contour of the upper main cutting edge 4 and the lower main cutting edge 6 is calculated in accordance with equations 1 to 8 above.
  • the upper main cutting edge 4 and the conical taper of the tool shank 2 are interconnected by a short cylindrical transitional region 3.
  • the lower main cutting edge 6 passes through an outlet 8 to a tool center 9.
  • the Profilschaftfräser is shown in a four-cutting variant, with all four teeth of the milling cutter have the same cutting contour.
  • the rake surface 7 of a tool tooth and the back 12 of the subsequent tooth determine the size of the chip chamber.
  • the Profilschaftfräser has in the embodiment, a first upper free surface 10 and a second upper free surface 11 at the upper main cutting edge 4 and a first lower free surface 13 and a second lower free surface 14 at the lower main cutting edge 6. Since the milling tool 87 does not cut in the center can its inner end region, that is, the tool center 9, be cylindrically shaped. A second embodiment of the milling tool 87 for producing the centering cavity 80 is shown in FIG. 4. Again, the milling tool 87 is a profiled end mill.
  • the Profilschaftfräser with cylindrical tool shank 1 has an upper main cutting edge 4, which is connected to a transition radius 5 with a secondary cutting edge 15. The contour of the upper main cutting edge 4 is calculated according to the above equations 5 to 8.
  • the upper main cutting edge 4 and the conical taper 2 of the tool shank 1 are interconnected by a short cylindrical transitional region 3.
  • the profiled milling cutter is four-edged, with all four teeth of the milling tool 87 having the same cutting contour.
  • the rake surface 7 of a tool tooth and the back 12 of the subsequent tooth determine the size of the chip chamber.
  • the profiled milling cutter has a first upper free surface 10 and a second upper free surface 11 on the upper main cutting edge 4, while the secondary cutting edge 15 has a third upper free surface 16.
  • FIG. 5 shows the milling tool 87 designed as a profiled milling cutter according to the first exemplary embodiment at the end of the feed movement of a first cut.
  • Fig. 6 shows the same figure with the milling tool 87 according to the second embodiment.
  • the figures make clear that the workpiece rotation axis 18 and the tool rotation axis 17 are set at a predefined angle ⁇ 55 to one another. This angular position between the axes on the one hand allows a significantly increased maximum component length for centering operations (see Fig. 2) and on the other hand it allows a conical design of the tool shank 2 which significantly contributes to the stability of the tool.
  • the workpiece 54 preferably comprises the tool-side end face 19 into which the centering cavity 80 is introduced.
  • the workpiece 54 includes a lateral surface 21, which preferably extends around the workpiece rotation axis 18.
  • a chuck-side end face 20 Opposite the tool-side end face 19 is a chuck-side end face 20.
  • the chuck-side end face 20 is arranged in particular in the first power chuck 59 of the main spindle 58.
  • the contour of the milling tool 87 designed as a profiled milling cutter is shown in detail in the vagina area in FIGS. 7 and 8.
  • FIG. 7 shows a milling cutter contour of the milling tool 87 according to the first exemplary embodiment.
  • the upper main cutting edge 4 connects. These and the lower main cutting edge 6 are connected to each other via the transition radius 5.
  • the contour of the cutting edges is determined according to equations 1 to 8 above and is to be converted according to the zr coordinate system in FIG.
  • the theoretically maximum cutting radius rc is to be used, which represents an upper limit for the radius r of the milling tool 87.
  • the theoretically maximum cutting radius r c is present when the corner radius r e , that is, the transition radius 5, of the milling tool 87 is set to zero.
  • 8 shows a milling cutter contour of the milling tool 87 according to the second exemplary embodiment.
  • the upper main cutting edge 4 connects.
  • FIGS. 11 and 12 show the contour of the upper main cutting edge 4 according to the above equations 5 to 8 and is to be implemented according to the zr coordinate system in FIG. For the calculation, in turn, the theoretically maximum cutting radius r c described above is to be used.
  • Figures 9 and 10 show the top view of the end face 19, in each of which only one of the two necessary for the generation of the centering cavity 80 milling cuts introduced has been. Only a first cut 88 is shown in FIG. 9, while only a second cut 89 is shown in FIG. If both milling cuts 88, 89 are introduced into the end face 19, this results in a centering cavity 80 corresponding to FIGS. 11 and 12.
  • the upper main cutting edge 4 cuts an upper face 48 of the first Section 88 and the lower main cutting edge 6 or the minor cutting edge 15 has a lower partial surface 46 of the first section 88.
  • the upper partial surface 48 of the first section 88 and the lower partial surface 46 of the first section 88 are separated by a first sectional arch 32 which is defined by the radius of the Milling tool 87 is created.
  • the first cutting arc 32 extends through the workpiece rotation axis 18.
  • a first track 43 and a second track 25 are shown in FIG. The first track 43 is aligned parallel to the tool rotation axis 17 when the first cut 88 is formed.
  • the second track 25 is aligned parallel to the tool rotation axis 17 when the second cut 89 is formed.
  • a lower cut line 47 of the first cut 88 is present on the end face 19, on which the lower face 46 of the first cut 88 meets the face 19.
  • an upper cut line 49 of the first cut 88 is present on the end face 19, on which the upper face 48 of the first cut 88 meets the face 19.
  • the upper face 50 of the second Section 89 and the lower part surface 53 of the second cut 89 are separated by a second cut arc 26, which is formed by the radius of the milling tool 87.
  • the second cutting arc 26 extends through the workpiece rotation axis 18.
  • a first track 43 and a second track 25 are shown in FIG.
  • the first track 43 is aligned parallel to the tool rotation axis 17 when the first cut 88 is formed.
  • the second track 25 is aligned parallel to the tool rotation axis 17 when the second cut 89 is formed.
  • a lower cut line 52 of the second cut 89 is present on the end face 19, at which the lower face 53 of the second cut 89 strikes the face 19.
  • FIGS. 11 and 12 show the end face 19 of a workpiece 54 introduced centering cavity 80 with the intersecting milling cuts 88, 89.
  • FIG. 12 shows a three-dimensional view of the workpiece 54. Both in FIG. 11 and in FIG. 12, the two milling cuts 88, 89 rotated by 90 ° relative to one another can be seen. It can be seen that the first cutting arc 32 and the second cutting arc 26 intersect exactly on the workpiece rotation axis 18.
  • the lower face 46 of the first cut 88 becomes a first lower face 30 of the first cut 88 and a second lower face 44 of the first cut 88
  • the upper face 48 of the first cut 88 a first upper sectional area 34 of the first section 88 and into a second upper partial area 42 of the first section 88
  • the lower section line 47 of the first section 88 into a first lower partial section line 31 of the first section 88 and into a second lower partial section line 45 of the first section 88
  • ⁇ upper section line 49 of the first section 88 is divided into a first upper section section 33 of the first section 88 and into a second upper section section 41 of the first section 88.
  • the lower face 53 of the second cut 89 becomes a first lower face 27 of the second cut 89 and a second lower face 36 of the second cut 89
  • the upper face 50 of the second cut 89 a first upper part surface 23 of the second section 89 and into a second upper part surface 39 of the second section 89
  • ⁇ the lower section line 52 of the second section 89 into a first lower section section 28 of the second section 89 and into a second lower section section 37 of the second section 89
  • ⁇ upper cut line 51 of the second cut 89 is divided into a first upper cut line 24 of the second cut 89 and a second upper cut line 38 of the second cut 89.
  • intersection line between the first upper partial surface 23 of the second section 89 and the second lower partial surface 44 of the first section 88 constitutes a first supporting edge 22, between the first lower partial surface 27 of the second section 89 and the first lower partial surface 30 of the first section 88 provides a second support edge 29, Between the first upper partial surface 34 of the first section 88 and the second lower partial surface 36 of the second section 89 represents a third supporting edge 35, and ⁇ between the second upper partial surface 39 of the second section 89 and the second upper partial surface 42 of the first section 88 a fourth support edge 40.
  • the first support edge 22, the second support edge 29, the third support edge 35 and the fourth support edge 40 are space lines extending in a star shape from a common intersection on the workpiece rotation axis 18 away.
  • first support edge 22, the second support edge 29, the third support edge 35 and the fourth support edge 40 each have the same angle between 30 ° and 45 ° to the workpiece rotation axis 18.
  • a conical centering tip 79 which fits into the centering cavity 80, can be brought into line contact with the workpiece 54.
  • the cone angle of the centering tip 79 is thus adapted to the angle between the first support edge 22, the second support edge 29, the third support edge 35 and the fourth support edge 40 and the workpiece rotation axis 18 and is in particular between 60 ° and 90 °.
  • FIGS. 13 and 14 An embodiment of a centering tip 79, which is designed for use with the centering cavity 80, is shown in FIGS. 13 and 14.
  • the centering tip 79 is designed so that surface contact occurs between the centering cavity 80 and the centering tip 79.
  • the contact between the contoured centering tip 79 and the centering cavity 80 is achieved exclusively by the following eight surface pairings: ⁇ A first contact surface 69 of the contoured centering tip 79 comes into contact with the second upper surface 42 of the first section 88 of the centering cavity 80 A second contact surface 70 of the contoured centering tip 79 comes into contact with the second upper part surface 39 of the second section 89 of the centering cavity 80.
  • a third contact surface 71 of the contoured centering tip 79 comes into contact with the second lower part surface 36 of the second section 89 Centering cavity 80.
  • a fourth contact surface 72 of the contoured centering tip 79 comes into contact with the first upper part surface 34 of the first section 88 of the centering cavity 80.
  • a fifth contact surface 73 of the contoured centering tip 79 comes into contact with the first lower part surface 30 of the first cut ts 88 of the centering cavity 80.
  • a sixth contact surface 74 of the contoured centering tip 79 comes into contact with the first lower partial surface 27 of the second section 89 of the centering cavity 80.
  • a seventh contact surface 75 of the contoured centering tip 79 comes into contact with the first upper partial surface 23 of the second section 89
  • An eighth contact surface 76 of the contoured centering tip 79 comes into contact with the second lower partial surface 44 of the first section 88 of the centering cavity 80.
  • a shoulder surface 77 of the centering tip 79 preferably does not come into contact with the workpiece 54.
  • the contoured centering tip 79 has a cylindrical shaft 68, followed by a short conical taper of the shaft 78 connects to the tip.
  • other shank designs eg a conical shank according to DIN 228 (Morse taper) are possible.
  • the centering tip 79 may be formed only conical and bear against the first support edge 22, the second support edge 29, the third support edge 35 and the fourth support edge 40. In this case, no torque transmission from the centering tip 79 to the workpiece 54 is possible.

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  • Milling Processes (AREA)

Abstract

L'invention concerne un procédé de réalisation d'un creux de centrage (80) dans une face frontale (19) d'une pièce (54) à usiner par une opération d'usinage avec enlèvement de copeaux subséquente, la pièce (54) pouvant tourner autour de son axe de rotation (18) aux fins d'usinage avec enlèvement de copeaux, le creux de centrage (80) étant conçu pour recevoir une pointe de centrage (79), et le creux de centrage (80) étant pratiqué dans la face frontale (19) avec une forme non symmétrique en rotation autour de l'axe de rotation (18) de la pièce.
PCT/EP2017/079262 2016-11-16 2017-11-15 Procédé et outil de fraisage destiné à la réalisation d'une cavité dans une pièce aux fins de la réception d'une pointe de centrage WO2018091495A1 (fr)

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EP17798194.1A EP3541554A1 (fr) 2016-11-16 2017-11-15 Procédé et outil de fraisage destiné à la réalisation d'une cavité dans une pièce aux fins de la réception d'une pointe de centrage

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DE102016222595.2 2016-11-16
DE102016222595.2A DE102016222595B4 (de) 2016-11-16 2016-11-16 Verfahren und Fräswerkzeug zur Herstellung einer Kavität in einem Werkstück für die Aufnahme einer Zentrierspitze

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CN112658342A (zh) * 2019-10-15 2021-04-16 住友化学株式会社 光学构件的制造方法
CN113263208A (zh) * 2021-05-25 2021-08-17 安徽机电职业技术学院 一种汽车后副车架铣削设备

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN115070469B (zh) * 2022-07-21 2022-11-01 烟台东星集团有限公司 一种销轴加工用一体化平台

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DE112011103537T5 (de) 2010-10-22 2013-08-01 Komatsu Ntc Ltd. Zentrierverfahren und Vorrichtung
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CN105382314A (zh) * 2015-12-11 2016-03-09 中国南方航空工业(集团)有限公司 喷嘴加工方法和装置

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US3187470A (en) * 1962-11-28 1965-06-08 Professional Instr Co Center hole lapping apparatus
DE3408210C1 (de) 1984-03-07 1985-06-20 Maschinenfabrik Ernst Thielenhaus GmbH, 5600 Wuppertal Vorrichtung für das Spannen von Werkstücken bei der Feinschleifbearbeitung
EP0466684B1 (fr) 1990-07-13 1994-09-14 GFM Gesellschaft für Fertigungstechnik und Maschinenbau Aktiengesellschaft Procédé pour le centrage équilibré de pièces devant être partiellement usinées, en particulier de vilebrequins
US5135810A (en) 1991-03-11 1992-08-04 Dana Corporation Method of machining and structure of machined pinion gear
DE4123859C2 (de) 1991-07-18 1994-05-05 Heller Geb Gmbh Maschf Verfahren zur spanenden Bearbeitung von Werkstücken mit rotationssymmetrischen Flächen, vorzugsweise von Kurbelwellen, und Vorrichtung zur Durchführung eines solchen Verfahrens
DE10040952B4 (de) 2000-08-22 2011-07-21 Reishauer Ag Vorrichtung zum reitstockseitigen Zentrieren und Spannen eines Werkstücks mit einem kreiszylindrischen Ende
WO2008014351A1 (fr) * 2006-07-25 2008-01-31 Mori Seiki U.S.A., Inc. Procédé et appareil d'usinage composite
EP2347844A1 (fr) 2010-01-26 2011-07-27 Liechti Engineering AG Procédé de rectification d'un logement de centrage
DE112011103537T5 (de) 2010-10-22 2013-08-01 Komatsu Ntc Ltd. Zentrierverfahren und Vorrichtung
DE102012102499A1 (de) 2012-03-23 2013-09-26 Mag Ias Gmbh Verfahren zur Endenbearbeitung sowie hierfür geeignete Maschine
CN105382314A (zh) * 2015-12-11 2016-03-09 中国南方航空工业(集团)有限公司 喷嘴加工方法和装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112658342A (zh) * 2019-10-15 2021-04-16 住友化学株式会社 光学构件的制造方法
CN113263208A (zh) * 2021-05-25 2021-08-17 安徽机电职业技术学院 一种汽车后副车架铣削设备

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DE102016222595A1 (de) 2018-05-17

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