阅读说明：本技术 镗刀架及车削刀具 (Boring cutter frame and turning cutter ) 是由 东海林齐 于 2020-04-23 设计创作，主要内容包括：镗刀架具有基座部件和切削刀片保持部件。基座部件具有第1主面和与第1主面相反侧的第2主面。切削刀片保持部件在第1主面与基座部件相连,且在从第1主面朝向第2主面的方向观察时,沿基座部件的周向配置。相对于从第1主面朝向第2主面的方向垂直且与基座部件交叉的截面的基座部件的截面积,大于相对于从第1主面朝向第2主面的方向垂直且与切削刀片保持部件交叉的截面的切削刀片保持部件的截面积。(The boring holder has a base member and a cutting insert retaining member. The base member has a 1 st main surface and a 2 nd main surface opposite to the 1 st main surface. The cutting insert holding member is connected to the base member at the 1 st main surface and is arranged along the circumferential direction of the base member when viewed from the 1 st main surface toward the 2 nd main surface. The cross-sectional area of the base member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the base member is larger than the cross-sectional area of the cutting insert retaining member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the cutting insert retaining member.)

1. A boring tool holder, comprising:

a base member having a 1 st main surface and a 2 nd main surface opposite to the 1 st main surface; and

a cutting blade holding member that is connected to the base member at the 1 st main surface and is arranged along a circumferential direction of the base member when viewed from the 1 st main surface toward the 2 nd main surface,

the cross-sectional area of the base member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the base member is larger than the cross-sectional area of the cutting insert retaining member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the cutting insert retaining member.

2. The boring tool holder of claim 1, wherein,

further comprising a stem member connected to said base member at said 2 nd major face,

the shank member is arranged so as not to overlap with the cutting insert holding member when viewed in a direction from the 1 st major surface toward the 2 nd major surface.

3. The boring holder according to claim 1 or 2, wherein,

the cutting insert holding member has a front end surface located on the opposite side of the 1 st main surface.

4. The boring tool holder of claim 3, wherein,

the circumferential angle of the leading end surface is 45 ° to 180 ° when viewed in a direction from the 1 st major surface toward the 2 nd major surface.

5. The boring tool holder according to claim 3 or 4, wherein,

the cutting insert holding member has a 1 st side end surface connected to the front end surface,

the distance between the 1 st side end surface and the 1 st main surface becomes shorter as being farther from the leading end surface in the circumferential direction.

6. The boring tool holder of claim 5, wherein,

a cutting insert arrangement groove is provided in the cutting insert holding member,

the 1 st side end surface is arcuate when the cutting insert holding member is viewed in a direction perpendicular to a direction from the 1 st main surface toward the 2 nd main surface and parallel to a bottom surface of the cutting insert arrangement groove.

7. A turning tool having:

the boring holder of any one of claims 1 to 6; and

a cutting insert mounted to the cutting insert retaining member.

Technical Field

The invention relates to a boring tool holder and a turning tool. The present application claims priority based on Japanese patent application No. 2019 and 092184, filed 5, 15, 2019. The entire contents of the disclosure of this japanese patent application are incorporated herein by reference.

Background

Japanese patent application laid-open No. 2005-177973 (patent document 1) discloses a boring tool for machining an inner diameter. In this boring tool, a throwaway tip is provided at the tip of an elongated holder.

Patent document 1: japanese patent laid-open publication No. 2005-177973

Disclosure of Invention

The boring holder according to the present invention includes a base member and a cutting insert holding member. The base member has a 1 st main surface and a 2 nd main surface opposite to the 1 st main surface. The cutting insert holding member is connected to the base member at the 1 st main surface and is arranged along the circumferential direction of the base member when viewed from the 1 st main surface toward the 2 nd main surface. The cross-sectional area of the base member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the base member is larger than the cross-sectional area of the cutting insert retaining member with respect to a cross-section perpendicular to the direction from the 1 st main surface toward the 2 nd main surface and intersecting the cutting insert retaining member.

Drawings

Fig. 1 is a schematic perspective view showing the structure of a boring holder according to embodiment 1.

Fig. 2 is a schematic plan view showing the structure of the boring holder according to embodiment 1.

Fig. 3 is a schematic side view showing the structure of the boring holder according to embodiment 1.

Fig. 4 is a front view schematically showing the structure of the boring holder according to embodiment 1.

Fig. 5 is a schematic perspective view showing the structure of the turning tool according to embodiment 1.

Fig. 6 is a partially cross-sectional view schematically illustrating a method of cutting a workpiece using the turning tool according to embodiment 1.

Fig. 7 is a schematic perspective view showing the structure of the boring holder according to embodiment 2.

Fig. 8 is a schematic plan view showing the structure of the boring holder according to embodiment 2.

Fig. 9 is a schematic side view showing the structure of the boring holder according to embodiment 2.

Fig. 10 is a front view schematically showing the structure of the boring holder according to embodiment 2.

Fig. 11 is a schematic perspective view showing the structure of the turning tool according to embodiment 2.

Fig. 12 is a partially cross-sectional view schematically illustrating a method of cutting a workpiece using the turning tool according to embodiment 2.

Detailed Description

[ problems to be solved by the invention ]

Further improvement in rigidity is required for boring holders and turning tools.

The invention aims to provide a boring cutter holder and a turning cutter which can improve rigidity.

[ Effect of the invention ]

According to the present invention, a boring holder and a turning tool capable of improving rigidity can be provided.

[ description of embodiments of the invention ]

First, embodiments of the present invention will be described.

(1) The boring holder 50 according to the present invention includes a base member 10 and a cutting insert holding member 20. The base member 10 has a 1 st main surface 11 and a 2 nd main surface 12 opposite to the 1 st main surface 11. The cutting insert holding member 20 is continuous with the base member 10 on the 1 st main surface 11, and is arranged along the circumferential direction a of the base member 10 when viewed from the 1 st main surface 11 toward the 2 nd main surface 12. The base member 10 has a cross-sectional area larger than that of the cutting insert retaining member 20 in a cross-section perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12. That is, the cross-sectional area of the base member 10 with respect to the cross-section perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12 and intersecting the base member 10 is larger than the cross-sectional area of the cutting insert retaining member 20 with respect to the cross-section perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12 and intersecting the cutting insert retaining member 20.

According to the boring holder 50 of the above (1), the cutting insert holding member 20 is arranged along the circumferential direction a of the base member 10. Therefore, the rigidity of the cutting insert holding member 20 can be improved as compared with the case of using a long and thin bar-shaped tool holder. In addition, when the base member 10 is cut by a plane perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12, the cross-sectional area is larger than that of the cutting blade holding member 20. The cutting insert holding member 20 is held by the base member 10 having a cross-sectional area larger than that of the cutting insert holding member 20, whereby the cutting insert holding member 20 can be stably held. As a result, the rigidity of the entire boring holder 50 can be improved.

(2) The boring holder 50 according to the above (1) may further include a shank member 30 connected to the base member 10 on the 2 nd main surface 12. The shank component 30 may be arranged so as not to overlap with the cutting insert holding member 20 when viewed from the 1 st major surface 11 toward the 2 nd major surface 12. The direction from the 1 st major face 11 toward the 2 nd major face 12 may be substantially parallel to the longitudinal direction of the shank component 30. The 1 st major face 11 and the longitudinal direction of the shank component 30 may be substantially perpendicular.

(3) In the boring holder 50 according to the above (1) or (2), the cutting insert holding member 20 may have the distal end surface 23 located on the opposite side of the 1 st main surface 11.

(4) In the boring holder 50 according to the above (3), the circumferential angle (1 st circumferential angle θ 1) of the tip surface 23 may be 45 ° to 180 ° as viewed in the direction from the 1 st main surface 11 toward the 2 nd main surface 12. This can improve rigidity and suppress interference with the workpiece.

(5) In the boring holder 50 according to the above (3) or (4), the cutting insert holding member 20 may have the 1 st end surface 21 connected to the front end surface 23. The cutting insert holding member 20 may have a 2 nd side end surface 22 on the opposite side of the 1 st side end surface 21 in the circumferential direction a. The distance between the 1 st side end surface 21 and the 1 st main surface 11 may be shorter as being farther from the front end surface 23 in the circumferential direction a. Thereby, a pocket is formed on the 1 st end surface 21 side of the cutting insert holding member 20. Therefore, chips can be efficiently discharged through the pocket.

(6) In the boring holder 50 according to the above (5), the cutting insert arrangement groove 25 may be provided in the cutting insert holding member 20. Also, the cutting insert arrangement groove 25 may have a bottom surface 4 connected to the front end surface 23. The 1 st end surface 21 may be arcuate when the tip holding member 20 is viewed in a direction perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12 and parallel to the bottom surface 4 of the tip placement groove 25. This can improve the rigidity of the cutting insert holding member 20 as compared with the case where the 1 st end surface 21 is perpendicular.

(7) The turning tool 100 according to the present invention includes the boring holder 50 described in any one of (1) to (6) above and the cutting insert 1 mounted on the cutting insert holding member 20.

[ details of embodiments of the present invention ]

Next, the details of the embodiments of the present invention will be described based on the drawings. In the following drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.

(embodiment 1)

First, the configuration of the boring holder 50 according to embodiment 1 will be described. The boring holder 50 according to embodiment 1 is a holder for outer diameter machining.

Fig. 1 is a schematic perspective view showing the structure of a boring holder 50 according to embodiment 1. As shown in fig. 1, the boring holder 50 according to embodiment 1 mainly includes a base member 10, a cutting insert holding member 20, and a shank member 30. The base member 10 has a 1 st main surface 11, a 2 nd main surface 12, and a 1 st outer peripheral surface 13. Fig. 2 is a schematic plan view showing the structure of the boring holder 50 according to embodiment 1. As shown in fig. 2, the 2 nd main surface 12 is a surface opposite to the 1 st main surface 11. The 1 st outer peripheral surface 13 is continuous with the 1 st main surface 11 and the 2 nd main surface 12, respectively. As shown in fig. 1 and 2, the 1 st outer peripheral surface 13 includes a 1 st notch surface 15, a 2 nd notch surface 16, a 3 rd notch surface 17, and a curved surface 14. The 1 st cut surface 15, the 2 nd cut surface 16, and the 3 rd cut surface 17 are each a flat surface. The curved surface 14 may be, for example, a part of a cylindrical surface.

Fig. 3 is a schematic side view showing the structure of the boring holder 50 according to embodiment 1. As shown in fig. 3, the curved surface 14 has an arc shape when viewed from the 1 st main surface 11 toward the 2 nd main surface 12. The 1 st notch surface 15 is connected to the curved surface 14. The 2 nd notch face 16 is connected to the 1 st notch face 15. The 2 nd notch face 16 is inclined with respect to the 1 st notch face 15. The 3 rd notch face 17 is connected to the 2 nd notch face 16. The 3 rd notch face 17 is inclined with respect to the 2 nd notch face 16. The 3 rd notch face 17 is connected to the curved face 14. The 2 nd notch face 16 is located between the 1 st notch face 15 and the 3 rd notch face 17. As shown in fig. 1, the area of the 2 nd slit surface 16 may be larger than the area of each of the 1 st slit surface 15 and the 3 rd slit surface 17.

Fig. 4 is a front view schematically showing the structure of the boring holder 50 according to embodiment 1. As shown in fig. 4, the base member 10 may be provided with a coolant introduction hole 41. Specifically, the coolant introduction hole 41 may be provided in the curved surface 14 of the base member 10, for example. The coolant introduction hole 41 is connected to the coolant discharge hole 40. A cooling liquid release hole 40 is provided to the cutting insert retaining member 20. Specifically, the coolant release hole 40 is provided in the 1 st side end surface 21 of the cutting insert holding member 20.

As shown in fig. 1 and 2, the cutting insert holding member 20 is connected to the base member 10 at the 1 st main surface 11. As shown in fig. 3, the cutting insert holding member 20 is arranged in the circumferential direction a when viewed from the 1 st major surface 11 toward the 2 nd major surface 12. As shown in fig. 4, the cutting insert retaining member 20 may be connected to the curved surface 14 of the base member 10. The cutting insert holding member 20 is provided, for example, along the circumferential direction a of the arcuate curved surface 14. The base member 10 has a cross-sectional area larger than that of the cutting insert retaining member 20 in a cross-section perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12.

As shown in fig. 1, the cutting insert holding member 20 has a front end surface 23, a front surface 26, a 1 st side end surface 21, a 2 nd side end surface 22, a 2 nd outer peripheral surface 28, a 1 st inner peripheral surface 27, and a 2 nd inner peripheral surface 24. The leading end surface 23 is located on the opposite side of the 1 st main surface 11. The cutting insert holding member 20 is provided with a cutting insert arrangement groove 25. The cutting insert arrangement groove 25 is provided with a screw hole 29. The front end surface 23 is connected to the cutting insert arrangement groove 25. The leading end surface 23 is a surface located at the forefront in a direction perpendicular to the 2 nd main surface 12. The front face 26 is connected to the front end face 23. The front surface 26 is located on the base member 10 side (rear) with respect to the front end surface 23. The front face 26 is remote from the cutting insert configuration slot 25.

The front end surface 23 extends in the circumferential direction a. The 1 st end face 21 is connected to the front end face 23. The 2 nd side end surface 22 is opposite to the 1 st side end surface 21 in the circumferential direction a. The 2 nd side end surface 22 is connected to the front end surface 23. From another viewpoint, the 1 st side end surface 21 is located on one end side in the circumferential direction a of the leading end surface 23, and the 2 nd side end surface 22 is located on the other end side in the circumferential direction a of the leading end surface 23. The 1 st side end surface 21 is connected to the cutting insert arrangement groove 25. The 2 nd side end surface 22 is away from the cutting insert arrangement groove 25.

As shown in fig. 1, the 1 st inner peripheral surface 27 is continuous with the 1 st end surface 21 and the 2 nd end surface 22, respectively. The 1 st inner peripheral surface 27 extends in the circumferential direction a. The 1 st inner peripheral surface 27 is continuous with the front end surface 23 and the front surface 26, respectively. As shown in fig. 2, the 1 st inner peripheral surface 27 is located on the 1 st main surface 11 side with respect to the leading end surface 23 in the direction perpendicular to the 2 nd main surface 12. From another viewpoint, the 1 st inner peripheral surface 27 is located between the leading end surface 23 and the 1 st main surface 11 in a direction perpendicular to the 2 nd main surface 12.

As shown in fig. 1, the 2 nd inner peripheral surface 24 is continuous with the 1 st end surface 21 and the 2 nd end surface 22, respectively. The 2 nd inner peripheral surface 24 extends in the circumferential direction a. The 2 nd inner peripheral surface 24 is continuous with the 1 st inner peripheral surface 27 and the 1 st main surface 11, respectively. The width of the 2 nd inner peripheral surface 24 in the circumferential direction a may be expanded from the 1 st inner peripheral surface 27 toward the 1 st main surface 11. As shown in fig. 2, the 2 nd inner peripheral surface 24 is positioned on the 1 st main surface 11 side with respect to the 1 st inner peripheral surface 27 in the direction perpendicular to the 2 nd main surface 12. From another point of view, the 2 nd inner peripheral surface 24 is located between the 1 st inner peripheral surface 27 and the 1 st main surface 11 in a direction perpendicular to the 2 nd main surface 12.

As shown in fig. 2, the handle member 30 is attached to the base member 10 at the 2 nd major face 12. The stem member 30 has a cylindrical shape, for example. The shank member 30 extends in a direction perpendicular to the 2 nd main surface 12. The base member 10 is located between the shank member 30 and the cutting insert retaining member 20 in a direction perpendicular with respect to the 2 nd major surface 12.

As shown in fig. 1, the distance between the 1 st side end surface 21 and the 1 st main surface 11 may be shorter as being farther from the front end surface 23 in the circumferential direction a. As shown in fig. 2, the cutting insert arrangement groove 25 has a side surface 3 and a bottom surface 4. The side surface 3 is connected to the 1 st end surface 21. The bottom surface 4 is connected to the front end surface 23. As shown in fig. 2, the 1 st end surface 21 may have an arc-shaped portion when viewed in a direction perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12 and parallel to the bottom surface 4 of the cutting insert arrangement groove 25. The radius of curvature of the 1 st end surface 21 (the 1 st radius of curvature R1) is, for example, 5mm to 40 mm.

As shown in fig. 3, the curvature radius (2 nd curvature radius R2) of the curved surface 14 of the base member 10 is, for example, 25mm to 150mm when viewed from the 1 st main surface 11 toward the 2 nd main surface 12. The 1 st radius of curvature R1 may be 10 times or more and 30 times or less the 2 nd radius of curvature R2.

As shown in fig. 3, the circumferential angle (1 st circumferential angle θ 1) of the leading end surface 23 is, for example, 45 ° to 90 ° when viewed from the 1 st main surface 11 toward the 2 nd main surface 12. The lower limit of the 1 st circumferential angle θ 1 is not particularly limited, and may be, for example, 50 ° or more, or 60 ° or more. The upper limit of the 1 st circumferential angle θ 1 is not particularly limited, and may be, for example, 80 ° or less, or 70 ° or less. As shown in fig. 3, the circumferential angle (2 nd circumferential angle θ 2) of the curved surface 14 is, for example, 90 ° to 180 ° when viewed from the 1 st main surface 11 toward the 2 nd main surface 12. The 2 nd circumferential angle θ 2 is greater than the 1 st circumferential angle θ 1. The 2 nd circumferential angle θ 2 may be, for example, 2 times the 1 st circumferential angle θ 1.

As shown in fig. 3, the shank member 30 may be arranged so as not to overlap with the cutting insert holding member 20 when viewed from the 1 st major surface 11 toward the 2 nd major surface 12. Specifically, the shank member 30 may be arranged so as to overlap the center B of a circle including the curved surface 14 when viewed in the direction from the 1 st main surface 11 toward the 2 nd main surface 12.

Next, the structure of the turning tool 100 according to embodiment 1 will be described.

Fig. 5 is a schematic oblique view showing the structure of the turning tool 100 according to embodiment 1. As shown in fig. 5, the turning tool 100 according to embodiment 1 mainly includes the boring holder 50, the cutting insert 1, and the fixing member 2 according to embodiment 1. The cutting insert 1 is mounted to the cutting insert retaining member 20. The cutting insert 1 is fixed to the cutting insert holding member 20 using the fixing member 2. The fixing member 2 is, for example, a screw. The cutting insert 1 is disposed in the cutting insert disposition groove 25. When the cutting insert 1 is disposed in the cutting insert disposition groove 25, the fixing member 2 is fastened to the screw hole 29.

As shown in fig. 5, the cutting insert arrangement groove 25 is provided at a position where the front end surface 23, the 1 st end surface 21, and the 1 st inner peripheral surface 27 intersect. In this case, the cutting insert 1 is disposed to protrude radially inward from the 1 st inner peripheral surface 27.

Next, a method of cutting a workpiece using the boring holder 50 according to embodiment 1 will be described.

Fig. 6 is a partially cross-sectional view schematically illustrating a method of cutting a workpiece using the turning tool 100 according to embodiment 1. The workpiece 60 is a member for an automatic transmission. As shown in fig. 6, the workpiece 60 is provided with an annular groove 63 and a through hole 62. The annular groove 63 surrounds the through hole 62. The annular groove 63 is formed by an inner circumferential surface 66, an outer circumferential surface 64, and a bottom surface 65. The workpiece 60 rotates about the rotation axis C. The turning tool 100 does not perform a rotational motion, and in fig. 6, performs a translational motion in the vertical direction, the horizontal direction, or a combination thereof in the plane of the paper.

The cutting insert 1 is disposed in a cutting insert arrangement groove 25 provided in the boring holder 50. In a state where the cutting insert 1 is held by the boring holder 50, the cutting insert 1 is pressed against the outer peripheral surface 64 of the annular groove portion 63, thereby cutting the outer peripheral surface 64. The cutting insert 1 is pressed against the bottom surface 65 of the annular groove portion 63, thereby cutting about half of the bottom surface 65. In fig. 6, the cut portion 61 is a portion cut off by the cutting insert 1.

(embodiment 2)

Next, the structure of the boring holder 50 according to embodiment 2 will be described. The boring holder 50 according to embodiment 2 is a holder for inner diameter machining. The boring holder 50 according to embodiment 2 is mainly configured such that the cutting insert arrangement groove 25 is located on the outer peripheral side, and is different from the boring holder 50 according to embodiment 1, and the other configurations are the same as those of the boring holder 50 according to embodiment 1. Next, a description will be given mainly of a structure different from the boring holder 50 according to embodiment 1.

Fig. 7 is a schematic perspective view showing the structure of the boring holder 50 according to embodiment 2. As shown in fig. 7, the boring holder 50 according to embodiment 2 mainly includes a base member 10, a cutting insert holding member 20, and a shank member 30.

As shown in fig. 7, the cutting insert holding member 20 has a front end surface 23, a front surface 26, a 1 st side end surface 21, a 2 nd side end surface 22, a 2 nd outer peripheral surface 28, a 1 st inner peripheral surface 27, and a 2 nd inner peripheral surface 24. The leading end surface 23 is located on the opposite side of the 1 st main surface 11. The cutting insert holding member 20 is provided with a cutting insert arrangement groove 25. The front end surface 23 may be remote from the cutting insert configuration slot 25. The leading end surface 23 is a surface located at the forefront in a direction perpendicular to the 2 nd main surface 12. The front face 26 is connected to the front end face 23. The front surface 26 is located on the base member 10 side (rear) with respect to the front end surface 23. The front face 26 is connected to the cutting insert arrangement groove 25.

The front end surface 23 and the front surface 26 each extend in the circumferential direction a. The 1 st end surface 21 is continuous with the front surface 26. The 2 nd side end surface 22 is located opposite to the 1 st side end surface 21 in the circumferential direction a. The 2 nd side end surface 22 is connected to the front end surface 23 and the front surface 26, respectively. From another viewpoint, the 1 st side end surface 21 is located on one end side in the circumferential direction a of the front face 26, and the 2 nd side end surface 22 is located on the other end side in the circumferential direction a of the front face 26. The 1 st side end surface 21 is connected to the cutting insert arrangement groove 25. The 2 nd side end surface 22 is away from the cutting insert arrangement groove 25.

As shown in fig. 7, the 1 st inner peripheral surface 27 is continuous with the 1 st end surface 21 and the 2 nd end surface 22, respectively. The 1 st inner peripheral surface 27 extends in the circumferential direction a. The 1 st inner peripheral surface 27 is continuous with the front surface 26. The 1 st inner peripheral surface 27 is distant from the front end surface 23. The front face 26 is located between the 1 st inner circumferential surface 27 and the front end surface 23. The front surface 26 is continuous with the 1 st inner peripheral surface 27 and the front end surface 23, respectively.

Fig. 8 is a schematic plan view showing the structure of the boring holder 50 according to embodiment 2. As shown in fig. 8, the front surface 26 is located on the 1 st main surface 11 side with respect to the front end surface 23 in the direction perpendicular to the 2 nd main surface 12. From another point of view, the front surface 26 is located between the front end surface 23 and the 1 st main surface 11 in a direction perpendicular to the 2 nd main surface 12. The 1 st inner peripheral surface 27 is located on the 1 st main surface 11 side with respect to the front surface 26 in a direction perpendicular to the 2 nd main surface 12. From another point of view, the 1 st inner peripheral surface 27 is located between the front surface 26 and the 1 st main surface 11 in a direction perpendicular to the 2 nd main surface 12.

Fig. 9 is a schematic side view showing the structure of the boring holder 50 according to embodiment 2. As shown in fig. 9, the front surface 26 is located radially inward of the front end surface 23. The 1 st inner peripheral surface 27 is located radially inward of the front surface 26. The 2 nd inner peripheral surface 24 is located radially inward of the 1 st inner peripheral surface 27. As shown in fig. 9, a part of the distal end surface 23 may be positioned radially outward of the curved surface 14 of the base member 10. Fig. 10 is a front view schematically showing the structure of the boring holder 50 according to embodiment 2. As shown in fig. 10, the cutting insert arrangement groove 25 is located on the outer peripheral side. Specifically, the cutting insert arrangement groove 25 is continuous with the 2 nd outer peripheral surface 28.

Next, the structure of the turning tool 100 according to embodiment 2 will be described.

Fig. 11 is a schematic oblique view showing the structure of the turning tool 100 according to embodiment 2. As shown in fig. 11, the turning tool 100 according to embodiment 2 mainly includes the boring holder 50, the cutting insert 1, and the fixing member 2 according to embodiment 2. The cutting insert 1 is mounted to the cutting insert retaining member 20. The cutting insert 1 is fixed to the cutting insert holding member 20 using the fixing member 2. The fixing member 2 is, for example, a screw. The cutting insert 1 is disposed in the cutting insert disposition groove 25. When the cutting insert 1 is disposed in the cutting insert disposition groove 25, the fixing member 2 is fastened to the screw hole 29.

As shown in fig. 11, the cutting insert arrangement groove 25 is provided at a position where the front end surface 23, the 1 st end surface 21, and the 2 nd outer peripheral surface 28 intersect. In this case, the cutting insert 1 is disposed to protrude outward in the radial direction from the 2 nd outer peripheral surface 28.

Next, a method of cutting a workpiece 60 using the boring holder 50 according to embodiment 2 will be described.

Fig. 12 is a partially cross-sectional view schematically illustrating a method of cutting a workpiece 60 by using the turning tool 100 according to embodiment 2. The workpiece 60 is a member for an automatic transmission. As shown in fig. 12, the workpiece 60 is provided with an annular groove 63 and a through hole 62. The annular groove 63 surrounds the through hole 62. The annular groove 63 is formed by an inner circumferential surface 66, an outer circumferential surface 64, and a bottom surface 65. The workpiece 60 rotates about the rotation axis C. The turning tool 100 does not perform a rotational motion, and in fig. 12, performs a translational motion in the vertical direction, the horizontal direction, or a combination thereof in the plane of the paper.

The cutting insert 1 is disposed in a cutting insert arrangement groove 25 provided in the boring holder 50. In a state where the cutting insert 1 is held by the boring holder 50, the cutting insert 1 is pressed against the inner circumferential surface 66 of the annular groove portion 63, whereby the inner circumferential surface 66 is cut. The cutting insert 1 is pressed against the bottom surface 65 of the annular groove portion 63, thereby cutting about half of the bottom surface 65. In fig. 12, the cut portion 61 is a portion cut off by the cutting insert 1.

Next, the operation and effects of the boring holder 50 and the turning tool 100 according to the above embodiment will be described.

According to the boring holder 50 and the turning tool 100 of the above embodiment, the cutting insert holding member 20 is arranged in the circumferential direction a. Therefore, the rigidity of the cutting insert holding member 20 can be improved as compared with a boring tool using an elongated bar-shaped tool holder. In addition, the base member 10 has a sectional area larger than that of the cutting insert retaining member 20. The cutting insert holding member 20 is held by the base member 10 having a cross-sectional area larger than that of the cutting insert holding member 20, and the cutting insert holding member 20 can be stably held. As a result, the rigidity of the entire boring holder 50 can be improved.

If the rotary workpiece 60 is turned using the boring holder 50, the boring holder 50 has improved rigidity, and thus chatter vibration can be suppressed. As a result, the surface roughness of the machined surface can be improved. In addition, the dimensional accuracy can be stabilized. And the turning tool 100 can be lengthened.

In the case of a boring tool using an elongated bar-shaped tool holder, a straightening tool is required to cut the bottom surface 65 of the annular groove portion 63 provided in the member for the automatic transmission. On the other hand, the boring holder 50 and the turning tool 100 according to the above embodiments can cut the bottom surface 65 of the annular groove portion 63. Therefore, according to the boring holder 50 and the turning tool 100 according to the above-described embodiments, since a straight tool is not required, efficient cutting can be performed.

Further, according to the boring holder 50 and the turning tool 100 according to the above-described embodiment, the circumferential angle (the 1 st circumferential angle θ 1) of the distal end surface 23 is 45 ° to 180 ° as viewed in the direction from the 1 st main surface 11 toward the 2 nd main surface 12. This can improve the rigidity and suppress interference with the workpiece 60.

Further, according to the boring holder 50 and the turning tool 100 according to the above-described embodiment, the cutting insert holding member 20 has the 1 st side end surface 21 continuous with the front end surface 23 and the 2 nd side end surface 22 on the opposite side of the 1 st side end surface 21 in the circumferential direction a. The distance between the 1 st side end surface 21 and the 1 st main surface 11 becomes shorter as it goes away from the front end surface 23 in the circumferential direction a. Thereby, a pocket is formed on the 1 st end surface 21 side of the cutting insert holding member 20. Therefore, chips can be efficiently discharged through the pocket.

Further, according to the boring holder 50 and the turning tool 100 of the above embodiment, the 1 st end surface 21 may be in an arc shape when viewed in a direction perpendicular to the direction from the 1 st main surface 11 toward the 2 nd main surface 12 and parallel to the bottom surface 4 of the cutting insert arrangement groove 25. This can improve the rigidity of the cutting insert holding member 20 as compared with the case where the 1 st end surface 21 is perpendicular.

Examples

Next, the cae (computer Aided engineering) analysis result will be described.

First, simulation models of the boring holder according to sample 1 and sample 2 were prepared. The boring holder according to sample 1 is an example and has the shape shown in fig. 1. The boring holder referred to in sample 2 is a comparative example, and is a standard boring holder having an elongated rod-like shape.

The maximum value of the displacement amount was calculated using the simulation models of the boring holder relating to sample 1 and sample 2. The maximum value of the displacement amount is the maximum value of the tip displacement amount in the direction perpendicular to the paper surface before and after the load application with respect to the tip rake face of the cutting insert 1, with reference to fig. 6 and 12. The paper surface vertical direction is the principal force direction of the cutting edge rake face. The main force direction is a direction substantially perpendicular to the cutting edge rake face of the cutting insert 1, and corresponds to the circumferential direction a of fig. 3. As the simulation software, NX8 manufactured by SIEMENS was used. The simulation conditions are as follows.

Feed amount: 0.4mm/rev

Cutting speed: 120m/min

Cut amount: 2mm

Relative cutting resistance: 1400MPa

Load setting: 1.12kN

Referring to fig. 6 and 12, the load is applied to a region of the tip rake face of the cutting insert 1 of 0.4mm in the lateral direction and 2mm in the longitudinal direction. The value of the relative cutting resistance is a value set by assuming gray cast iron as a material to be cut.

[ Table 1]

Sample numbering	Maximum value of displacement
		Sample 1	0.0373mm
Sample 2	0.8590mm

Table 1 shows the maximum values of the displacement amounts of the boring holder relating to samples 1 and 2. As shown in table 1, the maximum value of the displacement amount of the boring holder according to sample 1 was 0.0373 mm. On the other hand, the maximum value of the displacement amount of the boring holder relating to sample 2 was 0.8590 mm. The maximum value of the displacement amount of the boring holder relating to sample 1 is about 1/23 of the maximum value of the displacement amount of the boring holder relating to sample 2. From the above results, the boring holder according to sample 1 can surely reduce the maximum value of the displacement amount as compared with the boring holder according to sample 2.

The embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is defined by the claims, not by the above description, and includes all modifications within the meaning and range equivalent to the claims.

Description of the reference numerals

1 cutting insert, 2 fixed part, 3 side surface, 4 bottom surface, 10 base member, 11 1 st main surface, 12 nd 2 main surface, 13 st outer peripheral surface, 14 curved surface, 15 st 1 cut surface, 16 nd 2 cut surface, 17 rd 3 cut surface, 20 cutting insert holding member, 21 st side end surface, 22 nd 2 side end surface, 23 front end surface, 24 nd 2 inner peripheral surface, 25 cutting insert arrangement groove, 26 front surface, 27 st 1 inner peripheral surface, 28 nd 2 outer peripheral surface, 29 screw hole, 30 shank member, 40 coolant release hole, 41 coolant introduction hole, 50 boring holder, 60 machined material, 61 machined part, 62 through hole, 63 annular groove part, 64 outer peripheral surface, 65 bottom surface, 66 inner peripheral surface, 100 turning tool, a peripheral direction, B center, C rotation axis.