WO2021161753A1 - 刃先交換式切削工具ホルダおよび刃先交換式切削工具 - Google Patents
刃先交換式切削工具ホルダおよび刃先交換式切削工具 Download PDFInfo
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- WO2021161753A1 WO2021161753A1 PCT/JP2021/002046 JP2021002046W WO2021161753A1 WO 2021161753 A1 WO2021161753 A1 WO 2021161753A1 JP 2021002046 W JP2021002046 W JP 2021002046W WO 2021161753 A1 WO2021161753 A1 WO 2021161753A1
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- WIPO (PCT)
- Prior art keywords
- holder
- axis
- mounting seat
- inner peripheral
- tip
- Prior art date
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 202
- 238000013459 approach Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 description 12
- 238000012986 modification Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/202—Plate-like cutting inserts with special form
- B23C5/205—Plate-like cutting inserts with special form characterised by chip-breakers of special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/006—Details of the milling cutter body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/202—Plate-like cutting inserts with special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/04—Angles
Definitions
- a cutting tool with a replaceable cutting edge in which a cutting insert is detachably attached to an insert mounting seat formed on the outer periphery of a tool body rotated around an axis.
- the insert mounting seat is a mounting seat wall surface facing the tool outer peripheral side and a mounting seat facing the tool tip side, where the bottom surface of the mounting seat on which the seating surface of the cutting insert is seated and at least two side surfaces of the cutting insert which are insert restraint surfaces are in contact with each other. It has a wall surface.
- the corner portion where the bottom surface of the mounting seat of the insert mounting seat and the two mounting seat wall surfaces intersect, and the corner portion where the two mounting seat wall surfaces intersect with each other are included in the corner portion. It can be seen that recesses are formed with respect to the bottom surface of the mounting seat and the wall surface of the mounting seat. Such recesses prevent the crossing ridges between the seating surface of the cutting insert and the two sides and the crossing ridges between the two sides from interfering with the insert mounting seat and making the cutting insert mounting unstable. It is formed as an escape part for.
- Such an inclined surface is supposed to receive the cutting load on the inner peripheral side of the tool acting from the cutting edge of the cutting insert.
- the inclination angle of this inclined surface is set to 0 °. That is, in some cases, the tip surface of the holder body on the inner peripheral side of the tool on the wall surface of the insert mounting seat facing the outer peripheral side of the tool is formed in a flat shape completely perpendicular to the axis.
- the present invention was made against such a background.
- the stress due to the cutting load is concentrated on the relief portion formed at the corner where the bottom surface of the mounting seat facing the holder rotation direction of the insert mounting seat and the wall surface of the mounting seat facing the outer peripheral side of the holder body intersect. It is an object of the present invention to provide a cutting tool holder having a replaceable cutting edge and a cutting tool having a replaceable cutting edge, which can be avoided and can prevent damage to the holder body from the relief portion.
- one embodiment of the present invention is provided with a cutting tool on the outer peripheral portion of the tip of the holder body which is rotated in the holder rotation direction around the axis.
- a cutting tool holder with a replaceable cutting edge formed with an insert mounting seat to which the cutting insert can be detachably attached.
- the insert mounting seat is a mounting seat on which the seating surface of the cutting insert is seated facing the holder rotation direction.
- the first side surface of the cutting insert which extends from the bottom surface of the mounting seat in the direction of rotation of the holder and faces the inner peripheral side of the holder body, is brought into contact with the bottom surface, and the first side surface of the holder body faces the outer peripheral side.
- a first escape that is formed at a corner where the mounting seat wall surface, the first mounting seat wall surface, and the mounting seat bottom surface intersect, and is recessed with respect to the first mounting seat wall surface and the mounting seat bottom surface.
- the inner peripheral side of the holder body of the first mounting seat wall surface is provided with at least a portion, and the end edge of the first mounting seat wall surface on the tip side in the axial direction to the inner peripheral side in the radial direction with respect to the axial line. It has an edge on the tip side in the axial direction in a range of 2 mm or less, and an inclined surface is formed toward the rear end side in the axial direction toward the inner peripheral side of the holder body, and a cross section along the axis.
- the inclination angle ⁇ of the inclined surface in the above plane with respect to the plane perpendicular to the axis is 20 ° or more and 50 ° or less.
- one aspect of the cutting tool with a replaceable cutting edge of the present invention includes the above-mentioned cutting tool holder with a replaceable cutting edge and a cutting insert having the cutting edge and detachably attached to the insert mounting seat. It is a feature.
- the inclination angle ⁇ of the inclined surface is set to be relatively large, 20 ° or more and 50 ° or less. Therefore, as described above, the stress due to the cutting load can be dispersed and received throughout the insert mounting seat. It is possible to prevent the stress from being maximized at the first relief portion formed at the corner where the first mounting seat wall surface facing the outer peripheral side of the holder body and the bottom surface of the mounting seat intersect. Therefore, it is possible to prevent the holder body from being damaged from the first relief portion and to perform stable cutting for a long period of time.
- the inclination angle ⁇ is so small that it is less than 20 °, it becomes difficult to reduce the maximum value of the stress at the first relief portion based on the above findings, as will be demonstrated in the examples described later.
- the distance in the axial direction in the space area between the tip surface of the holder body and the machined surface becomes smaller, and when chips generated by cutting are caught in this space area, the chips are compressed and the chip discharge performance is impaired.
- the inclination angle ⁇ is preferably 20 ° or more and 40 ° or less, and more preferably 25 ° or more and 35 ° or less.
- the edge of the inclined surface on the tip side in the axial direction is formed in a range exceeding 2 mm on the inner peripheral side in the radial direction with respect to the axis from the edge on the tip side in the axial direction of the first mounting seat wall surface.
- the rigidity of the inner peripheral side of the holder body of the first mounting seat wall surface becomes too high at the portion exceeding 2 mm in the radial inner peripheral side with respect to this axis, and the maximum value of the stress in the first relief portion can be reduced. It may not be possible.
- the inner peripheral side of the holder body of the inclined surface within a range in which the inclination angle with respect to the plane perpendicular to the axis in the cross section along the axis is 0 ° or less than 20 °.
- the inner peripheral surface of the holder tip toward the rear end side in the axial direction may be formed so as to intersect the inclined surface.
- the distance h (mm) in the axial direction between the intersection of the inner peripheral surface of the holder tip and the inclined surface in the cross section along the axis and the edge of the inclined surface on the tip side in the axial direction it is desirable that the ratio h / L formed with respect to the length L (mm) of the edge of the first mounting seat wall surface on the holder rotation direction side is 0.1 or more and 0.45 or less.
- this ratio h / L is so small that it is less than 0.1, the elasticity given to the inner peripheral side of the holder body of the first mounting seat wall surface may be insufficient and the stress dispersion effect may not be obtained.
- this ratio h / L is so large as to exceed 0.45, the wall thickness on the inner peripheral side of the holder body becomes thinner than the axial length of the first mounting seat wall surface. There is a risk that the rigidity will be insufficient and the first mounting seat wall surface will be deformed or deteriorated.
- the ratio h / L is more preferably 0.1 or more and 0.35 or less, and further preferably 0.15 or more and 0.30 or less.
- the inner peripheral side of the holder body is within a range in which the inclination angle with respect to the plane perpendicular to the axis in the cross section along the axis is 0 ° or less than 20 °.
- the outer peripheral surface of the holder tip is arranged toward the rear end side in the axial direction, and the outer peripheral surface of the holder tip is the edge of the inclined surface on the tip side in the axial direction and the axis of the first mounting seat wall surface. It may be formed between the edge on the tip side in the direction.
- the present invention has found a feature in the shape of the inclined surface in the cross section along the axis. Therefore, in the cross section along the axis, the plane perpendicular to the axis does not have to exist in the holder body. In that case, the inclination angle of the inclined surface with respect to the virtual plane perpendicular to the axis is defined as the inclination angle ⁇ .
- the inner peripheral surface of the holder tip is arranged on the inner peripheral side of the holder body of the inclined surface, and the holder with respect to the virtual plane perpendicular to the axis in the cross section along the axis.
- the inclination angle ⁇ 2 of the tip inner peripheral surface is equal to or less than the inclination angle ⁇
- the holder tip inner peripheral surface is a flat surface extending in a direction perpendicular to the axis or a conical first inner surface centered on the axis.
- the stress due to the cutting load is concentrated on the first relief portion formed at the corner where the first mounting seat wall surface and the mounting seat bottom surface of the insert mounting seat intersect.
- the stress can be distributed and received throughout the insert mounting seat.
- FIG. 6 is a bottom view of the cutting tool with a replaceable cutting edge shown in FIG. 6 as viewed from the tip side in the axial direction.
- the cutting tool holder 10 having a replaceable cutting edge includes a cutting tool holder 10 having a replaceable cutting edge and a cutting insert 20.
- the cutting tool holder 10 having a replaceable cutting edge includes a holder body 1.
- the holder body 1 is formed of a metal material such as a steel material in a cylindrical shape centered on the axis O.
- the rear end portion (lower portion in FIGS. 1, 3 and 6) of the holder body 1 is a mounting portion 2 that is attached to the spindle of the machine tool via an arbor or the like.
- the tip end portion (upper portion in FIGS. 1, 3 and 6) of the holder main body 1 is a cutting edge portion 4.
- the cutting edge portion 4 is formed with an insert mounting seat 3 to which a cutting insert 20 having a cutting edge 21 is detachably attached.
- the direction in which the central axis of the tool extends that is, the direction in which the axis O extends is referred to as the axis O direction.
- the tip end side or the tip end side in the axis O direction one side from the mounting portion 2 toward the cutting edge portion 4
- the other side facing the mounting portion 2 from the cutting edge portion 4 is the rear end in the axis O direction. Called the side or rear end side.
- the direction orthogonal to the axis O is called the radial direction or the radial direction with respect to the axis O.
- the direction closer to the axis O is referred to as the radial inner peripheral side or the inner peripheral side
- the direction away from the axis O is referred to as the radial outer peripheral side or the outer peripheral side.
- the direction of orbiting around the axis O is called the circumferential direction.
- One side of the circumferential direction is the holder rotation direction T, and the other side is the side opposite to the holder rotation direction T, that is, the opposite holder rotation direction.
- Such a cutting tool holder 10 with a replaceable cutting edge is attached to the spindle of the machine tool via the arbor in a state where the cutting insert 20 is attached to the insert mounting seat 3.
- a mounting bolt (not shown) inserted from the tip side into the stepped inner peripheral portion of the holder body 1 is screwed into a screw hole formed in the tip portion of the arbor, so that the mounting portion 2 is the tip of the arbor. It is attached to the part.
- the cutting edge portion 4 is formed so that the outer peripheral surface of the central portion of the holder body 1 in the O-direction is constricted in a concave curved surface on the inner peripheral side.
- a tip pocket 5 is formed in this constricted portion so as to open to the tip surface of the holder body 1 and extend to the front of the mounting portion 2.
- the chip pocket 5 has an L-shaped cross section perpendicular to the axis O.
- a plurality of chip pockets 5 (five in the present embodiment) are formed at intervals in the circumferential direction (equal intervals in the present embodiment).
- the insert mounting seat 3 of the present embodiment includes a mounting seat bottom surface 3a, a first mounting seat wall surface 3b, and a second mounting seat. It is provided with a wall surface 3c.
- the bottom surface 3a of the mounting seat is formed so as to be recessed one step from the wall surface of the chip pocket 5 facing the holder rotation direction T to the side opposite to the holder rotation direction T, and faces the holder rotation direction T.
- the mounting seat bottom surface 3a has a substantially square shape.
- the first mounting seat wall surface 3b extends from the side ridge portion on the inner peripheral side of the holder main body 1 of the mounting seat bottom surface 3a to the holder rotation direction T side.
- the first mounting seat wall surface 3b and the mounting seat bottom surface 3a are recessed in a concave cylindrical surface shape.
- a relief portion 3d is formed.
- a second relief portion recessed in a concave cylindrical surface shape with respect to the second mounting seat wall surface 3c and the mounting seat bottom surface 3a. 3e is formed.
- a relief portion 3f is formed. That is, the insert mounting seat 3 includes a first relief portion 3d, a second relief portion 3e, and a third relief portion 3f.
- an inclined surface 6 is formed on the tip surface of the holder body 1 toward the rear end side in the axis O direction toward the inner peripheral side of the holder body 1.
- the inclined surface 6 is arranged on the inner peripheral side of the holder main body 1 of the first mounting seat wall surface 3b.
- the inclined surface 6 has an edge P on the tip side in the axis O direction in a range of 2 mm or less from the edge 3b1 on the tip side in the axis O direction of the first mounting seat wall surface 3b to the inner peripheral side in the radial direction with respect to the axis O. ..
- the inclination angle ⁇ of the inclined surface 6 with respect to the plane R perpendicular to the axis O in the cross section along the axis O is 20 ° or more and 50 ° or less.
- the inner peripheral surface 7 at the tip of the holder in the present embodiment has a plane shape having an inclination angle of 0 ° with respect to the plane R perpendicular to the axis O, that is, the plane R perpendicular to the axis O as shown in FIG. It has been matched. Therefore, in FIG. 4, the inclination angle ⁇ of the inclined surface 6 is set to the inclination angle ⁇ with respect to the inner peripheral surface 7 at the tip of the holder.
- the ratio h / L formed by the interval h (mm) shown in FIG. 4 with respect to the length L (mm) shown in FIG. 1 is 0.1 or more and 0.45 or less.
- the interval h is the axis O of the intersection Q of the holder tip inner peripheral surface 7 and the inclined surface 6 in the cross section along the axis O and the edge P of the inclined surface 6 on the tip side in the axis O direction.
- the length L is the length of the edge 3b2 on the holder rotation direction T side of the first mounting seat wall surface 3b.
- the edge P intersects the first mounting seat wall surface 3b and the inclined surface 6 so as to coincide with each other at one point M on the holder rotation direction T side.
- the holder tip outer peripheral surface 8 is arranged on the outer peripheral side of the holder main body 1 of the inclined surface 6 on the tip surface of the holder main body 1.
- the outer peripheral surface 8 of the holder tip is the rear end in the axis O direction as the inclination angle with respect to the plane perpendicular to the axis O in the cross section along the axis O is 0 ° or less than 20 ° toward the inner peripheral side of the holder body 1. Head to the side.
- the outer peripheral surface 8 of the holder tip is formed between the edge P on the tip side of the inclined surface 6 in the axis O direction and the edge 3b1 of the first mounting seat wall surface 3b on the tip side in the axis O direction.
- the outer peripheral surface 8 of the tip of the holder is formed in a substantially triangular shape as shown in FIGS. 2 and 5 when viewed from the tip side in the O direction of the axis.
- the width of the outer peripheral surface 8 of the holder tip with respect to the axis O gradually increases from the one point M toward the side opposite to the holder rotation direction T.
- the end of the outer peripheral surface 8 of the holder tip opposite to the holder rotation direction T intersects the opening in the tip surface of the holder body 1 of the third relief portion 3f and is interrupted.
- the edge P of the inclined surface 6 on the tip side in the axis O direction is 2 mm or less in the radial inner peripheral side with respect to the axis O from the edge 3b1 on the tip side in the axis O direction of the first mounting seat wall surface 3b. It is located in the range of. Therefore, the radial width of the outer peripheral surface 8 of the holder tip with respect to the axis O does not exceed 2 mm.
- the outer peripheral surface 8 of the holder tip in the present embodiment is also made flat like the inner peripheral surface 7 of the holder tip, which is perpendicular to the axis O.
- the inclined surface 6 in the present embodiment is formed in a conical surface shape centered on the axis O. Therefore, the edge P on the tip side of the inclined surface 6 in the axis O direction, which is the intersecting ridge line between the inclined surface 6 and the outer peripheral surface 8 of the holder tip, is located on one circumference centered on the axis O.
- the stress due to the cutting load acting on the cutting insert 20 can be dispersed throughout the insert mounting seat 3. It is possible to prevent stress from concentrating on the first relief portion 3d of the insert mounting seat 3. As a result, it is possible to prevent the holder body 1 from being damaged from the first relief portion 3d and to perform stable cutting for a long period of time.
- the inclination angle ⁇ is so small that it is less than 20 °, it becomes difficult to reduce the maximum stress value of the first relief portion 3d. Further, when the inclination angle ⁇ is less than 20 °, the distance in the axial direction O direction in the space region between the tip surface of the holder body 1 and the machined surface of the work material becomes small. Therefore, when the chips generated by cutting are bitten into this space region, the chips may be compressed and the chip discharge property may be impaired.
- the edge P on the tip side in the axis O direction of the inclined surface 6 is within a range of 2 mm or less in the radial inner peripheral side with respect to the axis O from the edge 3b1 on the tip side in the axis O direction of the first mounting seat wall surface 3b. Formed to be located.
- the inner peripheral surface 7 at the tip of the holder is formed so as to intersect the inclined surface 6 on the inner peripheral side of the holder main body 1 of the inclined surface 6.
- the inner peripheral surface 7 at the tip of the holder is rearward in the direction of the axis O as the inclination angle with respect to the plane perpendicular to the axis O in the cross section along the axis O is 0 ° or less than 20 ° toward the inner peripheral side of the holder body 1. Head to the edge. Therefore, it is possible to prevent the inclined surface 6 from reaching the inner peripheral portion of the cylindrical holder body 1 with the inclination angle ⁇ , and prevent the rigidity of the cutting edge portion 4 of the holder body 1 from being unnecessarily impaired. be able to.
- this ratio h / L is so small that it is less than 0.1, the elasticity given to the inner peripheral side of the holder body 1 of the first mounting seat wall surface 3b may be insufficient and the stress dispersion effect may not be obtained. ..
- this ratio h / L is so large as to exceed 0.45, the length L (mm) of the edge 3b2, which is the length of the first mounting seat wall surface 3b in the axis O direction, is obtained.
- the wall thickness on the inner peripheral side of the holder body 1 of the first mounting seat wall surface 3b becomes thin, and the rigidity may be insufficient to cause deterioration such as deformation of the first mounting seat wall surface 3b.
- the inclined surface 6 is formed in a conical surface shape centered on the axis O in this way, but the present invention is not limited to this. If the inclination angle ⁇ of the inclined surface 6 in the cross section along the axis O with respect to the plane R perpendicular to the axis O is 20 ° or more and 50 ° or less, the inclined surface 6 has a convex curve shape in the cross section along the axis O. It may be formed in a concave curve shape, or may be formed in a plurality of steps of a broken line shape.
- the holder tip outer peripheral surface 8 is formed on the outer peripheral side of the inclined surface 6 of the tip surface of the holder body 1.
- the outer peripheral surface 8 at the tip of the holder is rearward in the direction of the axis O as the inclination angle with respect to the plane R perpendicular to the axis O in the cross section along the axis O is 0 ° or less than 20 ° toward the inner peripheral side of the holder body 1. Head to the edge. Therefore, the outer peripheral surface 8 at the tip of the holder is formed between the edge P on the tip side in the axis O direction of the inclined surface 6 and the edge 3b1 on the tip side in the axis O direction of the first mounting seat wall surface 3b. become.
- the inclined surface 6 and the first mounting seat wall surface 3b directly intersect at one intersecting ridge line, and the edge P on the tip side of the inclined surface 6 in the axis O direction is P.
- the following effects are obtained according to the present embodiment. can get. That is, in the present embodiment, it is possible to prevent deformation of the intersecting ridge line between the first mounting seat wall surface 3b and the inclined surface 6 due to a cutting load, and it is possible to perform stable cutting for a long period of time. It becomes.
- the edge 3b1 of the first mounting seat wall surface 3b on the tip side in the axis O direction and the edge P of the inclined surface 6 on the tip side in the axis O direction are the first mounting seat wall surface 3b.
- the inclined surface 6 intersect at one point M on the holder rotation direction T side so as to coincide with each other.
- the outer peripheral surface 8 at the tip of the holder is formed on the side opposite to the rotation direction T of the holder from this one point M.
- the outer peripheral surface 8 of the holder tip may be formed over the entire length of the edge 3b1 on the tip side of the first mounting seat wall surface 3b in the O-direction.
- FIGS. 8 to 10 are cross-sectional views showing a cutting tool holder 10 with a replaceable cutting edge as a modification of the present embodiment. Specifically, FIGS. 8 and 9 show one modification, and FIG. 10 shows another modification. In the illustration of these modified examples, the same components as those in the present embodiment described above are designated by the same reference numerals, and mainly different points will be described below.
- the inner peripheral surface 7 at the tip of the holder is arranged on the inner peripheral side of the holder main body 1 of the inclined surface 6.
- the plane perpendicular to the axis O may be a virtual plane R
- the inclination angle ⁇ 2 of the holder tip inner peripheral surface 7 with respect to the virtual plane R is an inclined surface. It is equal to or less than the inclination angle ⁇ with respect to the virtual plane R of No. 6 (see FIG. 10).
- the inner peripheral surface 7 at the tip of the holder has a first inner peripheral surface portion 7a and a second inner peripheral surface portion 7b.
- the second inner peripheral surface portion 7b is arranged between the first inner peripheral surface portion 7a and the inclined surface 6 in the radial direction with respect to the axis O.
- the second inner peripheral surface portion 7b has a concave curved surface shape.
- the second inner peripheral surface portion 7b has a concave curved shape in a cross section along the axis O.
- the second inner peripheral surface portion 7b is connected to the first inner peripheral surface portion 7a and the inclined surface 6.
- the outer peripheral end of the second inner peripheral surface portion 7b is connected to the inner peripheral end of the inclined surface 6 via the intersection Q.
- the tangent line at the outer peripheral end of the second inner peripheral surface portion 7b coincides with the inclined surface 6 in the vertical cross-sectional view along the axis O. That is, the second inner peripheral surface portion 7b and the inclined surface 6 are smoothly connected so as to be in contact with each other.
- the present invention is not limited to this, and in the vertical cross-sectional view, the tangent line at the outer peripheral end of the second inner peripheral surface portion 7b does not have to coincide with the inclined surface 6.
- the end portion on the inner peripheral side of the second inner peripheral surface portion 7b is connected to the end portion on the outer peripheral side of the first inner peripheral surface portion 7a.
- the tangent line at the end of the second inner peripheral surface portion 7b on the inner peripheral side does not coincide with the first inner peripheral surface portion 7a in the vertical cross-sectional view.
- the present invention is not limited to this, and as in the other modification shown in FIG. 10, the tangent line at the inner peripheral side end of the second inner peripheral surface portion 7b coincides with the first inner peripheral surface portion 7a in the vertical cross-sectional view. You may. That is, the second inner peripheral surface portion 7b and the first inner peripheral surface portion 7a may be smoothly connected so as to be in contact with each other.
- the present invention may combine the configurations described in the above-described embodiments and modifications, etc., as long as it does not deviate from the gist of the present invention, and it is possible to add, omit, replace, or otherwise change the configurations. .. Further, the present invention is not limited by the above-described embodiments and the like, but is limited only by the claims.
- the relationship between the inclination angle ⁇ with respect to the plane R perpendicular to the axis O of the inclined surface 6 in the cross section along the axis O and the maximum stress value will be described.
- a cutting tool holder with a replaceable cutting edge in which the diameter of the cutting edge 21 of the cutting insert 20 attached to the insert mounting seat 3 (the diameter of the circle formed by the outer peripheral end of the cutting edge 21 around the axis O) is 63 mm. 10 and a cutting tool 30 with a replaceable cutting edge were prepared.
- the maximum stress value (MPa) is increased when the inclination angle ⁇ (°) of the inclined surface 6 is changed in the range of 10 ° to 70 °. How it changes was confirmed by finite element analysis (hereinafter referred to as CAE analysis) using finite element analysis simulation software.
- the stress value applied in this CAE analysis was calculated from the measured maximum resistance value.
- the component forces with the maximum resistance value of 4517.2 N are the main component force 3965.3 N and the back component force 2164.3 N
- the following stress values were used in the CAE analysis. That is, the stress value obtained by dividing the main component force 3965.3N by the area of each surface is used for the first mounting seat wall surface 3b and the mounting seat bottom surface 3a, and the back component force 2164. The stress value obtained by dividing 3N by the area of the restraint surface in the axis O direction was used.
- the material of the holder body 1 was set to a steel material having a Young's modulus of 210 GPa and a Poisson's ratio of 0.3, and CAE analysis was performed. The result is shown in FIG.
- the position of the edge P on the tip side of the inclined surface 6 in the axis O direction was fixed on the circumference having a radius of 19.17 mm from the axis O. Further, the distance h (mm) in the axis O direction between the intersection Q of the inner peripheral surface 7 of the holder tip and the inclined surface 6 in the cross section along the axis O and the edge P on the tip side of the inclined surface 6 in the axis O direction is The inclination angle ⁇ was changed so as to be 1.28 mm. Further, both the holder tip inner peripheral surface 7 and the holder tip outer peripheral surface 8 of the tip surface of the holder body 1 are flat surfaces perpendicular to the axis O.
- the maximum stress value (MPa) is an index of damage to the holder body 1 of the cutting tool holder 10 having a replaceable cutting edge. This is because the damage to the holder body 1 of the cutting tool holder 10 with a replaceable cutting edge in rolling machining is mainly due to repeated fatigue caused by the intermittent contact of the cutting tool 30 with a replaceable cutting edge with the work material during cutting. Because of that. Repeated fatigue occurs in the part susceptible to repeated stress, that is, the part where the maximum stress value is indicated. Therefore, this maximum stress value is used as an index of damage to the holder body 1.
- the maximum stress value exceeded 500 MPa, and the reduction of the maximum stress value was insufficient.
- the inclined surface 6 is close to the processed surface (bottom surface) of the work material formed by cutting, and the space area on the tip surface side of the holder body 1 is narrowed. Become. Therefore, chips generated by cutting may be crushed and compressed in this space region, which may adversely affect the chip discharge property.
- the wall thickness on the inner peripheral side of the holder body 1 of the inclined surface 6 becomes thin, so that the maximum stress value jumps up to about 1500 MPa at once. There is. It can be seen that the holder body 1 is likely to be damaged from the first relief portion 3d due to the concentration of stress due to the cutting load.
- the ratio h / L is the distance h in the axis O direction between the intersection Q of the inner peripheral surface 7 of the holder tip and the inclined surface 6 in the cross section along the axis O and the edge P on the tip side of the inclined surface 6 in the axis O direction.
- (Mm) is the ratio of the first mounting seat wall surface 3b to the length L (mm) of the edge 3b2 on the holder rotation direction T side.
- the setting conditions for CAE analysis are the same as in Example 1.
- a cutting tool holder 10 having a replaceable cutting edge and a cutting tool 30 having a replaceable cutting edge having a diameter of 63 mm in the cutting edge 21 of the cutting insert 20 mounted on the insert mounting seat 3 were prepared.
- the inclination angle ⁇ (°) of the inclined surface 6 is fixed at 30 °, and the edge of the first mounting seat wall surface 3b on the holder rotation direction T side.
- the length L (mm) of 3b2 was fixed at 6.85 mm.
- the ratio h / L is 0. It is 1 or more and 0.45 or less.
- the maximum stress value is in the range of about 460 MPa or less, and it can be seen that the stress is dispersed and the maximum stress value is reduced.
- the ratio h / L is 0.04, which is less than 0.1.
- the maximum stress value jumps to 500 MPa or more at once. It can be seen that as the interval h (mm) becomes smaller, the rigidity of the inner peripheral side of the holder body 1 of the first mounting seat wall surface 3b increases, and the stress is not sufficiently dispersed.
- the rigidity of the holder body 1 is insufficient in this area, and the first mounting seat wall surface 3b is deformed or the like. It may cause deterioration.
- the first relief portion formed at the corner where the first mounting seat wall surface of the insert mounting seat and the bottom surface of the mounting seat intersect.
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Abstract
Description
本願は、2020年2月13日に日本国に出願された特願2020-022579号に基づき優先権を主張し、その内容をここに援用する。
また、本発明の刃先交換式切削工具の一つの態様は、上述の刃先交換式切削工具ホルダと、前記切刃を有し前記インサート取付座に着脱可能に取り付けられる切削インサートと、を備えることを特徴とする。
この場合、凹曲面状の第2内周面部によって、ホルダ先端内周面と傾斜面との交点が滑らかに接続される。このため、切削負荷による応力がこの交点に集中することが抑制される。
本実施形態では、工具中心軸が延びる方向、すなわち軸線Oが延びる方向を、軸線O方向と呼ぶ。軸線O方向のうち、取付部2から切刃部4へ向かう一方側を、軸線O方向先端側または先端側と呼び、切刃部4から取付部2へ向かう他方側を、軸線O方向後端側または後端側と呼ぶ。
軸線Oと直交する方向を、軸線Oに対する径方向、または径方向と呼ぶ。径方向のうち、軸線Oに近づく方向を、径方向内周側または内周側と呼び、軸線Oから離れる方向を、径方向外周側または外周側と呼ぶ。
軸線O回りに周回する方向を周方向と呼ぶ。周方向のうち一方側は、ホルダ回転方向Tであり、他方側は、ホルダ回転方向Tとは反対側つまり反ホルダ回転方向である。
2 取付部
3 インサート取付座
3a 取付座底面
3b 第1の取付座壁面
3b1 第1の取付座壁面3bの軸線O方向先端側の端縁
3b2 第1の取付座壁面3bのホルダ回転方向T側の端縁
3c 第2の取付座壁面
3d 第1の逃げ部
3e 第2の逃げ部
3f 第3の逃げ部
4 切刃部
5 チップポケット
6 傾斜面
7 ホルダ先端内周面
7a 第1内周面部
7b 第2内周面部
8 ホルダ先端外周面
10 刃先交換式切削工具ホルダ
20 切削インサート
21 切刃
23 第2の正方形面(着座面)
26 第1の側面
30 刃先交換式切削工具
O ホルダ本体1の軸線
T ホルダ回転方向
θ 傾斜面6の傾斜角
θ2 ホルダ先端内周面7の傾斜角
P 傾斜面6の軸線O方向先端側の端縁
Q 軸線Oに沿った断面におけるホルダ先端内周面7と傾斜面6との交点
R 軸線Oに垂直な平面(ホルダ先端内周面)
L 第1の取付座壁面3bのホルダ回転方向T側の端縁3b2の長さ
h 軸線Oに沿った断面におけるホルダ先端内周面7と傾斜面6との交点Qと、傾斜面6の軸線O方向先端側の端縁Pとの軸線O方向の間隔
Claims (6)
- 軸線回りにホルダ回転方向に回転させられるホルダ本体の先端外周部に、切刃を備えた切削インサートが着脱可能に取り付けられるインサート取付座が形成された刃先交換式切削工具ホルダであって、
上記インサート取付座は、
上記ホルダ回転方向を向いて上記切削インサートの着座面が着座させられる取付座底面と、
この取付座底面から上記ホルダ回転方向に向けて延びて上記切削インサートの上記ホルダ本体の内周側を向く第1の側面が当接させられ、上記ホルダ本体の外周側を向く第1の取付座壁面と、
この第1の取付座壁面と上記取付座底面とが交差する隅角部に形成されて上記第1の取付座壁面と上記取付座底面とに対して凹む第1の逃げ部と、を少なくとも備え、
上記第1の取付座壁面の上記ホルダ本体の内周側には、この第1の取付座壁面の上記軸線方向先端側の端縁から上記軸線に対する径方向内周側に2mm以下の範囲に上記軸線方向先端側の端縁を有して上記ホルダ本体の内周側に向かうに従い上記軸線方向後端側に向かう傾斜面が形成されており、
上記軸線に沿った断面における上記傾斜面の上記軸線に垂直な平面に対する傾斜角θが20°以上50°以下とされていることを特徴とする刃先交換式切削工具ホルダ。 - 上記傾斜面の上記ホルダ本体の内周側には、上記軸線に沿った断面における上記軸線に垂直な平面に対する傾斜角が0°、または20°未満の範囲内で上記ホルダ本体の内周側に向かうに従い上記軸線方向後端側に向かうホルダ先端内周面が、上記傾斜面と交差するように形成されており、
上記軸線に沿った断面における上記ホルダ先端内周面と上記傾斜面との交点と、上記傾斜面の上記軸線方向先端側の端縁との上記軸線方向の間隔h(mm)が、上記第1の取付座壁面の上記ホルダ回転方向側の端縁の長さL(mm)に対してなす比h/Lが0.1以上0.45以下とされていることを特徴とする請求項1に記載の刃先交換式切削工具ホルダ。 - 上記傾斜面は、上記軸線を中心とする円錐面状とされていることを特徴とする請求項1または請求項2に記載の刃先交換式切削工具ホルダ。
- 上記傾斜面の上記ホルダ本体の外周側には、上記軸線に沿った断面における上記軸線に垂直な平面に対する傾斜角が0°、または20°未満の範囲内で上記ホルダ本体の内周側に向かうに従い上記軸線方向後端側に向かうホルダ先端外周面が配置され、
上記ホルダ先端外周面は、上記傾斜面の上記軸線方向先端側の端縁と、上記第1の取付座壁面の上記軸線方向先端側の端縁との間に形成されていることを特徴とする請求項1から請求項3のうちいずれか一項に記載の刃先交換式切削工具ホルダ。 - 上記傾斜面の上記ホルダ本体の内周側には、ホルダ先端内周面が配置され、
上記軸線に沿った断面において、上記軸線に垂直な仮想平面に対する上記ホルダ先端内周面の傾斜角θ2は、上記傾斜角θ以下であり、
上記ホルダ先端内周面は、
上記軸線と垂直な方向に拡がる平面状または上記軸線を中心とする円錐面状の第1内周面部と、
上記軸線に対する径方向において上記第1内周面部と上記傾斜面との間に配置され、上記第1内周面部と上記傾斜面とに接続される第2内周面部と、を有し、
上記第2内周面部は、上記軸線に沿った断面において凹曲線状をなすことを特徴とする請求項1に記載の刃先交換式切削工具ホルダ。 - 請求項1から請求項5のうちいずれか一項に記載の刃先交換式切削工具ホルダと、
前記切刃を有し前記インサート取付座に着脱可能に取り付けられる切削インサートと、を備えることを特徴とする刃先交換式切削工具。
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EP21754642.3A EP4104959A4 (en) | 2020-02-13 | 2021-01-21 | CUTTING TOOL HOLDER WITH REPLACEABLE BLADE AND CUTTING TOOL WITH REPLACEABLE BLADE |
US17/785,376 US20230026062A1 (en) | 2020-02-13 | 2021-01-21 | Indexable cutting tool holder and indexable cutting tool |
CN202180007517.1A CN114867575B (zh) | 2020-02-13 | 2021-01-21 | 可转位刀片式切削工具保持架及可转位刀片式切削工具 |
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KR20220101733A (ko) | 2022-07-19 |
CN114867575B (zh) | 2023-10-27 |
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CN114867575A (zh) | 2022-08-05 |
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