Method for manufacturing holders, cutting tools, and machined products

Abstract

A holder based on an aspect of the present disclosure extends from a first end to a second end along a central axis, and includes a first member, a second member, and a fixture. The first member includes a first end surface, a first outer peripheral surface, a protrusion portion including a first surface facing toward the second end, and a first hole extending from the first surface. The second member includes a second end surface opposite to the first end surface, a second outer peripheral surface extending from the second end surface, and a second hole extending from the second outer peripheral surface toward the first hole. The fixture is inserted into the first hole through the second hole, and the protrusion portion is located on the central axis.

Description

Cross-reference to Related Applications , , , ,

[0004] , ,

[0005]

[0001] This application claims the priority of Japanese Patent Application No. 2023-029999 filed on February 28, 2023, and incorporates the entire disclosure of the prior application herein for reference.

Technical Field

[0002] The present disclosure relates to a holder, a cutting tool, and a method for manufacturing a cut workpiece, and more specifically, to a holder having two members, a cutting tool, and a method for manufacturing a cut workpiece.

Background Art

[0003] As a holder of a cutting tool used when machining a workpiece, for example, holders described in Japanese Patent Application Laid-Open No. 2001-502252 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2016-516600 (Patent Document 2) are known. The holders in the cutting tools described in these patent documents are composed of two members, a first component and a second component.

[0004] When the holder is composed of a plurality of members, further improvement in the bonding stability between these members is required

Summary of the Invention

[0005] A holder according to one aspect of the present disclosure is rod-shaped and extends along a central axis from a first end to a second end, and comprises a first member located on the side of the first end, a second member located on the side of the second end than the first member, and a fastener for fixing the first member to the second member. The first member has a first end face located on the side of the second end, a first outer peripheral surface extending from the first end face toward the first end, a projection extending from the first end face toward the side of the second end and having a first surface facing toward the side of the second end, and a first hole extending from the first surface toward the side of the first end. The second member has a second end face located on the side of the first end and facing the first end face, a second outer peripheral surface extending from the second end face toward the second end, and a second hole extending from the second outer peripheral surface toward the first hole. The fastener is inserted into the first hole through the second hole, and the projection is located on the central axis. [Brief explanation of the drawing]

[0006] [Figure 1] This is a top view showing a holder according to one embodiment. [Figure 2] Figure 1 is a perspective view of the holder shown, taken from direction A1. [Figure 3] Figure 2 is a perspective view showing the first and second components disassembled. [Figure 4] Figure 3 is a perspective view of the first and second members, etc., as seen from direction A2. [Figure 5] This is a top-view perspective plan view of the holder shown in Figure 1. [Figure 6] Figure 5 is a magnified view of region B1. [Figure 7] Figure 5 is a plan view of the first member. [Figure 8] This is a plan view of the first member as seen from the second end. [Figure 9] This is a plan view of the second member as seen from the first end side. [Figure 10] Figure 1 is a plan view of the holder shown, viewed from direction A3. [Figure 11] Figure 3 is a plan view of the first member as seen from direction A4. [Figure 12] This is a schematic diagram illustrating one step in the manufacturing method of a machined workpiece according to one embodiment. [Figure 13] This is a schematic diagram illustrating one step in the manufacturing method of a machined workpiece according to one embodiment. [Figure 14] This is a schematic diagram illustrating one step in the manufacturing method of a machined workpiece according to one embodiment. [Modes for carrying out the invention]

[0007] <Holder> Hereinafter, holder 1 of embodiments not limited to this disclosure will be described in detail with reference to the drawings. However, for the sake of clarity, the drawings referenced below show only the main components necessary to describe each embodiment in a simplified manner. Therefore, holder 1 of this disclosure may include any components not shown in the drawings referenced. Furthermore, the dimensions of the components in each drawing do not faithfully represent the dimensions of the actual components or the dimensional ratios of each component.

[0008] The holder 1 of this disclosure is rod-shaped, extending from a first end 1a to a second end 1b along a central axis O1, as shown in the example not limited to Figures 1-4. The central axis O1 is the axis passing through the center of the holder 1. For the sake of explanation, the first end 1a will be referred to as the front end 1a, and the second end 1b as the rear end 1b.

[0009] The holder 1 includes a first member 3 located on the side of the tip 1a, a second member 5 located on the side of the rear end 1b that is further along than the first member 3, and a fastener 7 that fixes the first member 3 to the second member 5. In the holder 1 shown in this embodiment, the first member 3 is called the head, etc., and is the part to which the cutting insert is attached. The second member 5 is called the shank, etc., and is the part that is gripped by the machine tool. In the example shown in Figures 1 to 4, which is not limited to this, the first member 3 includes the tip 1a, and the second member 5 includes the rear end 1b.

[0010] Figure 1 is a top view of the holder 1, Figure 2 is a perspective view of the holder 1 from the direction A1 shown in Figure 1, and Figure 3 is a perspective view showing the first member 3 separated from the second member 5 as shown in Figure 2, and shows the first member 3, second member 5 and fixing device 7 in a disassembled state. Figure 4 is a perspective view of the holder 1 shown in Figure 3 from the direction A2.

[0011] As shown in the example not limited to Figures 3 and 4, the first member 3 has a first front end surface 9 located on the side of the front end 1a, a first rear end surface 11 (first end surface) located on the side of the rear end 1b, and a first outer peripheral surface 13 located between the first front end surface 9 and the first rear end surface 11.

[0012] The first outer peripheral surface 13 extends from the first rear end surface 11 toward the tip 1a. The first outer peripheral surface 13 has a first upper surface 15 (upper surface), a first lower surface 17 (lower surface) located opposite the first upper surface 15, a first front surface 19 located between the first upper surface 15 and the first lower surface 17, and a first back surface 21 located opposite the first front surface 19. The first tip surface 9, the first rear end surface 11, the first upper surface 15, the first lower surface 17, the first front surface 19, and the first back surface 21 may each have a planar shape.

[0013] Furthermore, the first member 3 has a pocket 23 located on the tip 1a side, which is open on the first tip surface 9, the first upper surface 15, and the first front surface 19, and a projection 25 extending from the first rear end surface 11 toward the rear end 1b. The projection 25 may be cylindrical or conical in shape extending along the central axis O1. Here, the cylindrical (conical) shape does not have to be strictly cylindrical (conical), and may have a hole, as shown in the example shown in Figure 4.

[0014] The pocket 23 is the area where the cutting insert is attached. The cutting insert may be fixed to the pocket 23 by fixing screws or other fixing members such as clamps. In order to specify the position of the pocket 23 on the first member 3, the first front surface 19 may be conveniently replaced with a side surface.

[0015] The protruding portion 25 has a first surface 27 facing the side of the rear end 1b. Facing the side of the rear end 1b does not necessarily mean that the first surface 27 is substantially perpendicular to the central axis O1. However, when the first surface 27 is substantially perpendicular to the central axis O1, the holder 1 has high holding stability. Substantially perpendicular means that the angle formed by the first surface 27 and the central axis O1 is within the range of ±5°.

[0016] Furthermore, the protruding portion 25 has a first opening 29 located on the first surface 27. The first member 3 may have a first hole 31 extending from the first opening 29 toward the tip 1a side. In other words, the first member 3 may have a first hole 31 extending from the first surface 27 toward the tip 1a side, and the first hole 31 may have a first opening 29 located on the first surface 27. In the holder 1 shown in this embodiment, the first member 3 has the entire first hole 31.

[0017] The first hole 31 may approach any surface of the first outer peripheral surface 13 as it extends toward the tip 1a side. In a non-limiting example shown in FIGS. 5 to 7, the first hole 31 approaches the first front surface 19 as it extends toward the tip 1a side. Here, FIG. 5 is a plan view of the holder 1 shown in FIG. 1 seen from above, FIG. 6 is an enlarged view corresponding to the region B1 shown in FIG. 5, and FIG. 7 is a plan view of the first member 3 shown in FIG. 5.

[0018] [[ID=1st2]]The second member 5 is located on the tip 1a side and has a second front surface 33 (second end surface) facing the first rear end surface 11, a second rear end surface 35 located on the side opposite to the second front surface 33, and a second outer peripheral surface 37 located between the second front surface 33 and the second rear end surface 35.

[0019] The second outer peripheral surface 37 extends from the second tip surface 33 toward the rear end 1b. The second outer peripheral surface 37 has a second upper surface 39, a second lower surface 41 located on the opposite side of the second upper surface 39, a second front surface 43 located between the second upper surface 39 and the second lower surface 41, and a second rear surface 45 (back surface) located on the opposite side of the second front surface 43. The second tip surface 33, the second rear end surface 35, the second upper surface 39, the second lower surface 41, the second front surface 43, and the second rear surface 45 may each have a planar shape. The second front surface 43 may face the same side as the first front surface 19. The second rear surface 45 may face the opposite side of the second front surface 43.

[0020] Here, in a non-limiting example shown in FIGS. 1 to 4, the directions in which the first upper surface 15, the first lower surface 17, the first front surface 19, and the first rear surface 21 face are the same as the directions in which the second upper surface 39, the second lower surface 41, the second front surface 43, and the second rear surface 45 face, respectively. In a non-limiting example shown in FIGS. 1 to 4, the first upper surface 15 is continuous with the second upper surface 39, the first lower surface 17 is continuous with the second lower surface 41, the first front surface 19 is continuous with the second front surface 43, and the first rear surface 21 is continuous with the second rear surface 45.

[0021] Hereinafter, for convenience of explanation, the direction in which the second upper surface 39 faces is defined as the upper side, the direction in which the second lower surface 41 faces is defined as the lower side, the direction in which the second front surface 43 faces is defined as the front side (foreside), and the direction in which the second rear surface 45 faces is defined as the back side (backside).

[0022] The second outer peripheral surface 37 has a second opening 47 (opening). In a non-limiting example shown in FIG. 4, the second opening 47 is located on the second rear surface 45. Further, the second member 5 has a second hole 49 that extends from the second opening 47 toward the tip 1a side. In other words, the second member 5 may have a second hole urchased from the second outer peripheral surface 37 toward the tip 1a side, and the second hole 49 may have a second opening 47 located on the second outer peripheral surface 37. The second hole 49 may extend from the second outer peripheral surface 37 toward the first hole 31. The fixing tool 7 may be inserted into the second opening 47.

[0023] In the holder 1 shown in this embodiment, the second member 5 has the entirety of the second hole 49. The second hole 49 may approach any of the surfaces of the second outer peripheral surface 37 as it approaches the tip 1a side. In the example shown in Figures 5 and 6, which is not limited to this, the second hole 49 approaches the second front surface 43 as it approaches the tip 1a side.

[0024] Examples of the locations into which the fixing device 7 is inserted include the first hole 31 and the second hole 49, but the locations into which the fixing device 7 is inserted are not limited to these. In addition to the first hole 31 and the second hole 49, the location into which the fixing device 7 is inserted may also have a portion connecting these holes.

[0025] The second member 5 has a recess 50 located on the tip 1a side of the second hole 49. In the holder 1 shown in this embodiment, the projection 25 is inserted into the recess 50. The inner diameter of the recess 50 may be larger than the inner diameter of the second hole 49. The recess 50 may be connected to the second hole 49 on the rear end 1b side.

[0026] In the holder 1 shown in this embodiment, the end of the second hole 49 on the side of the front end 1a is located at the end of the recess 50 on the side of the rear end 1b. More specifically, the recess 50 has a second surface 51 located on the side of the rear end 1b, and the second hole 49 has a third opening 53 located at its end on the side of the front end 1a. The third opening 53 is located at the second surface 51 of the recess 50.

[0027] Furthermore, the second surface 51 may face the first surface 27. Also, in order to facilitate insertion of the projection 25 into the recess 50, the inner diameter of the recess 50 may be slightly larger than the outer diameter of the projection 25, that is, a small amount of "play" may be set between the recess 50 and the projection 25.

[0028] The fastener 7 is inserted into the first hole 31 through the second hole 49. The type of fastener 7 is not particularly limited and may be a screw and / or a clamp. There is no particular limit to the method of fastening with the fastener 7, but in the holder 1 shown in this embodiment, screw grooves are provided in the fastener 7 and the first hole 31, and by tightening the fastener 7 inserted into the first hole 31, the second member 5 moves relatively closer to the first member 3, and the first member 3 is fixed to the second member 5.

[0029] In the first hole 31, the portion with the screw groove may be located closer to the tip 1a than the portion without the screw groove. In this case, the inner diameter of the portion with the screw groove may be smaller than the inner diameter of the portion without the screw groove.

[0030] Here, the second hole 49 does not necessarily have a screw thread. Also, the inner diameter of the second hole 49 may be slightly larger than the outer diameter of the fastener 7, that is, a small amount of "play" may be set between the second hole 49 and the fastener 7. In such a case, the second hole 49 is less likely to be an obstacle when the fastener 7 is inserted into the first hole 31, and the fastener 7 is easier to insert into the first hole 31.

[0031] The projection 25 is located on the central axis O1. In other words, the central axis O1 passes through the projection 25. In the example shown in Figure 8, the central axis O1 passes through the center P1 of the first rear end surface 11, and the center P1 of the first rear end surface 11 is located on the projection 25. Specifically, the center P1 of the first rear end surface 11 is located on the first surface 27. Here, Figure 8 is a plan view of the first member 3 as seen from the rear end 1b side, and Figure 9 is a plan view of the second member 5 as seen from the front end 1a side.

[0032] Furthermore, the second member 5, as shown in Figure 1 and other examples, is a rectangular prism shape. In such cases, the central axis of the second member 5 may be considered as the central axis O1 of the holder 1. In the above case, the central axis of the second member 5, which passes through the center P2 of the second rear end face 35 and extends in a direction parallel to the second outer peripheral face 37, can be considered as the central axis O1 of the holder 1.

[0033] When the head is fixed by inserting the fixing device 7 from the shank, an opening for inserting the fixing device 7 may be provided on the side of the shank, from the viewpoint of ease of insertion of the fixing device 7. However, in such a case, as shown in Patent Document 1, if the projection 25 is provided only on the upper surface side of the head, the rigidity of the head tends to decrease because the hole in the central part of the head is located closer to the tip 1a.

[0034] On the other hand, in the holder 1 shown in this embodiment, the central axis O1 passes through the projection 25, that is, the projection 25 is located at the center P1 of the first rear end face 11, which increases the rigidity of the first member 3. In addition, the cutting load applied to the first member 3 can be stably received by the second member 5. Therefore, the holder 1 has high holding stability and high bonding stability. Furthermore, if the first surface 27 is located on the central axis O1, in other words, if the central axis O1 passes through the first surface 27, the rigidity of the first member 3 tends to be even higher.

[0035] The end of the first member 3 on the side of the rear end 1b may be located on the projection 25. More specifically, the end of the first member 3 on the side of the rear end 1b may be located on the first surface 27. In this case, it becomes easier to insert the first member 3 into the second member 5. In addition, the rigidity of the portion of the second member 5 located on the side of the tip 1a that joins with the first member 3 becomes higher.

[0036] The end of the second member 5 on the side of tip 1a may be located on the second tip surface 33. In this case, it becomes easier to insert the first member 3 into the second member 5. In addition, the rigidity of the portion of the first member 3 located on the side of tip 1a that joins with the second member 5 is increased.

[0037] In the example shown in Figure 4, which is not limited to this, the fastener 7 may have a shaft portion 54 extending along the axis of the fastener 7. The shaft portion 54 may have a screw groove on the side of the tip 1a. In the holder 1 shown in this embodiment, a screw groove is provided in the first hole 31, while a screw groove is not provided in the second hole 49. Therefore, it is sufficient that the portion of the shaft portion 54 that is inserted into the first hole 31 has a screw groove. In such a case, the outer diameter of the portion of the shaft portion 54 having a screw groove may be smaller than the outer diameter of the portion of the shaft portion 54 that does not have a screw groove.

[0038] Furthermore, in the example shown in Figure 4, which is not limited to this design, the fastener 7 may have a head 55 located on the rear end 1b side of the shaft 54. The head 55 may also have a larger outer diameter than the shaft 54. In such a case, when fixing the first member 3 to the second member 5, tightening the fastener 7 allows force to be applied from the head 55 toward the tip 1a of the second member 5, thereby bringing the second member 5 closer to the first member 3 more efficiently.

[0039] As shown in the example not limited to Figure 6, the second hole 49 may have a small diameter portion 49a located on the side of the tip 1a and a large diameter portion 49b having a larger inner diameter than the small diameter portion 49a and located on the side of the rear end 1b than the small diameter portion 49a. In this configuration, the head portion 55 may abut against a third surface 56 located between the small diameter portion 49a and the large diameter portion 49b, thereby applying force from the head portion 55 to the second member 5 in the direction of the tip 1a. In this case, the small diameter portion 49a may be connected to the large diameter portion 49b, and the large diameter portion 49b may have the third surface 56.

[0040] In addition, the head 55 may be separated from the first member 3. In this case, the head 55 can more efficiently apply force to the second member 5 in the direction of the tip 1a.

[0041] The second opening 47 may be located on the back. In the holder 1 shown in this embodiment, the second opening 47 is located on the second back surface 45. When the second member 5 is attached to a machine tool, the second back surface 45 generally faces the operator, so if the holder 1 has the above configuration, it becomes easier to insert the fastener 7 into the second member 5.

[0042] The projection 25 may be separated from the side surface. In the holder 1 shown in this embodiment, the projection 25 is separated from the first outer peripheral surface 13. In this case, it becomes easier to insert the first member 3 into the second member 5 from the side of the tip 1a.

[0043] Furthermore, in the example shown in Figure 7, which is not limited to this design, at least a portion of the first hole 31 may be located on the side of the projection 25 toward the tip 1a. In this case, the projection 25 is not unnecessarily long, making it easier to insert the first member 3 into the second member 5. Also, the fastener 7 may be located on the side of the rear end 1b toward the first rear end face 11. In the holder 1 shown in this embodiment, the entire fastener 7 is located on the side of the rear end 1b toward the first rear end face 11.

[0044] The first opening 29 may be located on the rear side of the central axis O1. In this case, the first hole 31 is more likely to be located on the rear side, and the first hole 31 is more likely to be located away from the pocket 23. As a result, the rigidity of the first member 3 tends to be higher. In the example shown in Figure 8, which is not limited to this case, the entire first opening 29 is located on the rear side of the central axis O1, that is, on the side of the first rear surface 21.

[0045] The center of the second opening 47 may be located on the lower side. In the holder 1 shown in this embodiment, the center of the second opening 47 is located on the side of the second lower surface 41. In such a case, the first hole 31, which is in communication with the second hole 49, is also located on the lower side, so the first hole 31 is likely to be located away from the pocket 23. As a result, the rigidity of the first member 3 tends to be higher. In the example shown in Figure 10, which is not limited to this example, at least a part of the second opening 47 is located below the central axis O1. Here, Figure 10 is a plan view of the holder 1 shown in Figure 1 as seen from direction A3.

[0046] When the first member 3 is viewed from the rear end 1b side, the projection 25 may be asymmetrical with respect to the central axis O1. In other words, the projection 25 does not have to have n-fold symmetry (where n is an integer of 2 or more) around the central axis O1. For example, when the first member 3 is viewed from the rear end 1b side, the center of the projection 25 may be far from the central axis O1. Furthermore, asymmetry means, for example, that the first surface 27 is elliptical, or that each vertex is a polygon with rounded edges. In such cases, when attaching the first member 3, it becomes less likely that mistakes will occur, such as attaching the first member 3 upside down.

[0047] The fastener 7 may have a bottom portion 57 located on the side of the tip 1a. The fastener 7 may also have a head portion 58 located on the side of the rear end 1b. The bottom portion 57 and the head portion 58 may each be ends in a direction along the central axis O2 of the fastener 7. In the example shown in Figure 6, the center P3 of the bottom portion 57 and the center P4 of the head portion 58 may pass through the central axis O2 of the fastener 7.

[0048] Here, the imaginary line segment connecting the center P3 of the bottom 57 and the center P4 of the top end 58 is defined as the axis S of the fixing device 7. When the axis S is viewed from a direction perpendicular to both this axis S and the central axis O1, in other words, when viewed through from a direction perpendicular to both the axis S and the central axis O1, the length L1 of the axis S in the direction along the central axis O1 may be longer than the length L2 of the axis S in the direction perpendicular to the central axis O1. In such a case, the first member 3 becomes easier to move from the rear end 1b side, or the second member 5 becomes easier to move from the front end 1a side. Here, when the axis S is viewed from a direction perpendicular to both the axis S and the central axis O1, it may also be when the axis S is viewed from a direction perpendicular to the second upper surface 39.

[0049] Furthermore, the axis S may be located on the lower side (first lower surface 17) than the central axis O1. In such a case, the first hole 31, which is in communication with the second hole 49, is also located on the lower side, making it easier for the first hole 31 to be located away from the pocket 23. As a result, the rigidity of the first member 3 tends to increase.

[0050] The projection 25 may further have a peripheral wall portion 59 connected to the first surface 27 and the first rear end surface 11. Furthermore, the outer diameter of the projection 25 may decrease from the front end 1a side toward the rear end 1b side. In such a case, the holding stability between the first member 3 and the second member 5 tends to be higher. As shown in the example without limitation in Figures 7 and 11, the peripheral wall portion 59 may have a tapered shape in which the outer diameter decreases from the front end 1a side toward the rear end 1b side. Here, Figure 11 is a plan view of the first member 3 shown in Figure 3 as seen from direction A4.

[0051] Furthermore, the inclination θ1 of the peripheral wall portion 59 with respect to the central axis O1 may be smaller than the inclination θ2 of the axis S with respect to the central axis O1. In such a case, the inclination of the fixing device 7 with respect to the central axis O1 becomes relatively smaller, making it easier to pull in the first member 3 and / or the second member 5 in the direction along the central axis O1. In the example shown in Figures 5 and 6, which is not limited to this case, the inclination θ1 of the peripheral wall portion 59 with respect to the central axis O1 is smaller than the inclination θ2 of the axis S with respect to the central axis O1. The relationship between the magnitudes of the inclinations may also be evaluated when viewed from the upper surface (first upper surface 15).

[0052] The sizes of the first member 3 and the second member 5 are not particularly limited. For example, the length from the tip 1a to the first rear end surface 11 may be 10 to 100 mm. Also, the length from the first upper surface 15 to the first lower surface 17 may be 5 to 50 mm. Also, the length from the second tip surface 33 to the rear end 1b may be 50 to 200 mm. Also, the length from the second upper surface 39 to the second lower surface 41 may be 5 to 50 mm.

[0053] For example, the material used for holder 1 can be steel, cast iron, cemented carbide, or the like.

[0054] <Cutting tools> Next, the cutting tool of the embodiment of this disclosure will be described with reference to the drawings.

[0055] The cutting tool 101 of this disclosure is rod-shaped, extending from a tip 1a to a rear end 1b, as shown in the example (not limited to) in Figures 12 to 14. The cutting tool 101 includes a holder 1 and a cutting insert 103 fixed to the holder 1. The cutting insert 103 may be located in a pocket 23 in the holder 1. The cutting insert 103 has a through hole 105.

[0056] In one example not limited to those shown in Figures 12 to 14, the cutting tool 101 includes an insert screw 109 that can be used to secure the cutting insert 103 to the pocket 23. In one example not limited to those shown in Figure 1, the pocket 23 may have a pocket hole 111 extending from the side of the first upper surface 11 to the side of the first lower surface 13. The cutting insert 103 can be secured to the pocket 23 by inserting the insert screw 109 into the through hole 105 in the cutting insert 103 and the pocket hole 111 in the pocket 23.

[0057] Examples of materials for the cutting insert 103 include cemented carbide and cermet. Examples of cemented carbide compositions include WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co is produced by sintering tungsten carbide (WC) with cobalt (Co) powder. WC-TiC-Co is obtained by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co is obtained by adding tantalum carbide (TaC) to WC-TiC-Co.

[0058] Furthermore, cermets are sintered composite materials that combine ceramic components with metals. Specifically, examples of cermets include materials that mainly contain titanium compounds such as titanium carbide (TiC) and titanium nitride (TiN).

[0059] The surface of the cutting insert 103 may be coated with a film using chemical vapor deposition (CVD) or physical vapor deposition (PVD). Examples of film compositions include titanium carbide (TiC), titanium nitride (TiN), titanium carbonitride (TiCN), and alumina (Al2O3).

[0060] <Method for manufacturing machined parts> Next, a method for manufacturing a machined workpiece according to an embodiment of the present disclosure will be described with reference to the drawings.

[0061] The machined workpiece is produced by machining the workpiece material 201. The method for manufacturing the machined workpiece in this disclosure comprises the following steps: (C1) A process of rotating the workpiece 201, (C2) A step of bringing the cutting tool 101 into contact with the rotating workpiece 201, (C3) A step of separating the cutting tool 101 from the workpiece 201, It is equipped with.

[0062] More specifically, first, as shown in the example shown in Figure 12, the workpiece 201 is rotated around the rotation axis O3, and the cutting tool 101 is brought relatively close to the workpiece 201. Next, as shown in the example shown in Figure 13, the cutting edge 107 of the cutting tool 101 is brought into contact with the rotating workpiece 201 to cut the workpiece 201. Then, as shown in the example shown in Figure 14, the cutting tool 101 is moved relatively away from the workpiece 201.

[0063] In one embodiment, the cutting tool 101 is moved in the Y1 direction while the rotating shaft O3 is fixed and the workpiece 201 is rotating. In another example shown in Figure 13, the workpiece 201 is cut by bringing the cutting edge 107 of the insert into contact with the rotating workpiece 201. In yet another example shown in Figure 14, the cutting tool 101 is moved away from the workpiece 201 by moving it in the Y2 direction while the workpiece 201 is rotating.

[0064] In the manufacturing method of this embodiment, the cutting process involves moving the cutting tool 101 in each step to bring the cutting tool 101 into contact with the workpiece 201 or to move the cutting tool 101 away from the workpiece 201. However, the method is not limited to this configuration.

[0065] For example, in step (C1), the workpiece 201 may be brought closer to the cutting tool 101. Similarly, in step (C3), the workpiece 201 may be moved away from the cutting tool 101. If the cutting process is to be continued, the process of maintaining the rotation of the workpiece 201 and bringing the cutting edge 107 of the insert into contact with different parts of the workpiece 201 can be repeated.

[0066] Examples of materials for the workpiece 201 include carbon steel, alloy steel, stainless steel, cast iron, or non-ferrous metals.

[0067] In one embodiment, (1) a rod-shaped holder extending along a central axis from a first end to a second end comprises a first member located on the side of the first end, a second member located on the side of the second end than the first member, and a fastener for fixing the first member to the second member, wherein the first member has a first end face located on the side of the second end, a first outer peripheral surface extending from the first end face toward the first end, and extending from the first end face toward the side of the second end, and The second member has a projection having a first surface facing the side of the second end, and a first hole extending from the first surface toward the side of the first end, and the second member has a second end surface located toward the side of the first end and facing the first end surface, a second outer peripheral surface extending from the second end surface toward the second end, and a second hole extending from the second outer peripheral surface toward the first hole, the fastener is inserted into the first hole through the second hole, and the projection may be located on the central axis.

[0068] (2) In the holder of (1) above, the first surface may be located on the central axis.

[0069] (3) In the holder of (1) or (2) above, the end of the first member on the side of the second end may be located on the projection.

[0070] (4) In the holder of (3) above, the end of the first member on the side of the second end may be located on the first surface.

[0071] (5) In any of the holders described in (1) to (4) above, the end of the second member on the side of the first end may be located on the second end face.

[0072] (6) In any of the holders described in (1) to (5) above, the fixing device has a shaft portion extending along the axis of the fixing device and a head portion located on the second end side of the shaft portion and having a larger outer diameter than the shaft portion, wherein the head portion may be separated from the first member.

[0073] (7) In any of the holders described in (1) to (6) above, the projection may be separated from the first outer peripheral surface.

[0074] (8) In any of the holders described in (1) to (7) above, when the first member is viewed from the side of the second end, the projection may be asymmetrical with respect to the central axis.

[0075] (9) In any of the holders described in (1) to (8) above, when the first end face is the first rear end face, the first member further has a first front face located on the side of the first end, the first outer peripheral surface has an upper surface, a lower surface located on the opposite side of the upper surface, a first front surface located between the upper surface and the lower surface, and a pocket located on the side of the first end that is open on the first front face, the upper surface and the first front surface, the second outer peripheral surface has a second front surface facing the same side as the first front surface and a back surface facing the opposite side of the second front surface, and the second opening may be located on the back surface.

[0076] (10) In the holder of (9) above, the shaft of the fixing device may be located on the lower surface side of the central axis.

[0077] (11) In any of the holders described in (1) to (10) above, the fixing device has a bottom portion located on the side of the first end and a top portion located on the side of the second end, and the imaginary line segment connecting the center of the bottom portion and the center of the top portion is the axis of the fixing device, and when viewed from a direction perpendicular to the axis of the fixing device and the central axis, the length of the axis of the fixing device in the direction along the central axis may be longer than the length of the axis of the fixing device in the direction perpendicular to the central axis.

[0078] (12) In the holder of (11) above, the projection further has a peripheral wall portion connected to the first surface and the first end surface, the outer diameter of the projection decreases from the side of the first end toward the side of the second end, the first peripheral surface has an upper surface, and when viewed through from the side of the upper surface, the inclination of the peripheral wall portion with respect to the central axis may be smaller than the inclination of the axis of the fixing device with respect to the central axis.

[0079] (13) The cutting tool may have any of the holders described in (1) to (12) above, and a cutting insert fixed to the holder.

[0080] (14) A method for manufacturing a machined workpiece may include the steps of: rotating a workpiece; bringing the cutting tool described in (13) into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

[0081] The inventions described in this disclosure have been explained based on the drawings and embodiments. However, the inventions described in this disclosure are not limited to the embodiments described above. That is, the inventions described in this disclosure can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the inventions described in this disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included in the scope of this disclosure. [Explanation of symbols]

[0082] 1. Holder 1a...1st end (tip) 1b...Second end (rear end) 3. First component 5. Second component 7... Fixture 9...First tip surface 11...1st rear end surface 13...First outer peripheral surface 15...1st top surface 17...1st bottom surface 19...First front (side view) 21...1st back 23 pockets 25...Protrusion 27...Front page 29...First opening 31...First hole 33...2nd tip surface 35...Second rear end surface 37...Second outer peripheral surface 39...2nd top surface 41...2nd bottom surface 43...2nd front 45...2nd back 47...Second opening 49...Second hole 49a...Small diameter section 49b...Large diameter section 50... recessed 51...2nd page 53...Third opening 54... Shaft 55...Head 56...3rd page 57...bottom 58...Head end 59...Peripheral wall part 101·Cutting tools 103 Cutting Inserts 105 ··Through hole 107 Cutting edge 109 Insert Screw 111...Pocket holes 201...Work material O1, O2...center axis O3... Rotating shaft P1~P4...center S... Shaft of the fixing device L1, L2... Length θ1, θ2... slope Y1, Y2... Direction of movement

Claims

1. It is a rod shape extending from the first end to the second end along the central axis, The first member located on the side of the first end, A second member located closer to the second end than the first member, The device includes a fastener for fixing the first member to the second member, The first member is, The first end face located on the side of the second end, A first outer peripheral surface extending from the first end face toward the first end, A projection extending from the first end face toward the second end and having a first face facing toward the second end, It has a first hole extending from the first surface toward the side of the first end, The second member is, A second end face located on the side of the first end and facing the first end face, A second outer peripheral surface extending from the second end face toward the second end, A second hole extending from the second outer surface toward the first hole, It has a recess located on the side of the first end that is closer to the second hole, into which the projection is inserted, The recess has a larger inner diameter than the second hole and is connected to the second hole at the second end. The fastener is inserted into the first hole through the second hole. The aforementioned projection is a holder located on the central axis.

2. The first surface is located on the central axis, as described in claim 1.

3. The holder according to claim 1, wherein the end of the first member on the side of the second end is located on the projection.

4. The holder according to claim 3, wherein the end portion of the first member on the side of the second end is located on the first surface.

5. The holder according to claim 1, wherein the end of the second member on the side of the first end is located on the second end face.

6. The aforementioned fixing device is A shaft portion extending along the axis of the fixing device, It has a head that is located on the second end side of the shaft portion and has a larger outer diameter than the shaft portion, The holder according to claim 1, wherein the head is separated from the first member.

7. The holder according to claim 1, wherein the projection is separated from the first outer peripheral surface.

8. When the first member is viewed from the side of the second end, The holder according to claim 1, wherein the projection is asymmetrical with respect to the central axis.

9. When the first end face is designated as the first rear end face, the first member further has a first front end face located on the side of the first end, The first outer surface is, Top surface and, The lower surface located on the opposite side of the upper surface, A first front surface located between the upper surface and the lower surface, It has a pocket located on the first end side, which is open on the first tip surface, the top surface and the first front surface, The second outer surface is, A second front panel facing the same side as the first front panel, The rear facing the opposite side of the second front, It has an opening into which the aforementioned fastener is inserted, The holder according to claim 1, wherein the opening is located on the back surface.

10. The holder according to claim 9, wherein the shaft of the fixing device is located on the lower side of the central axis.

11. The aforementioned fixing device is The bottom portion located on the side of the first end, It has a head end located on the side of the second end, The imaginary line segment connecting the center of the bottom and the center of the top is the axis of the fixing device. When viewed through the aforementioned fixing device from a direction perpendicular to the axis and the central axis, The holder according to claim 9, wherein the length of the shaft of the fixing device in the direction along the central axis is longer than the length of the shaft of the fixing device in the direction perpendicular to the central axis.

12. The projection further has a peripheral wall portion connected to the first surface and the first end surface, As you move from the first end towards the second end, the outer diameter of the projection decreases. The first outer surface has an upper surface, When viewed from the upper surface side, The holder according to claim 11, wherein the inclination of the peripheral wall portion with respect to the central axis is smaller than the inclination of the axis of the fixing device with respect to the central axis.

13. A holder according to any one of claims 1 to 12, A cutting tool having a cutting insert fixed to the holder.

14. The process of rotating the workpiece, A step of bringing the cutting tool described in claim 13 into contact with the rotating workpiece, A method for manufacturing a machined workpiece, comprising the step of separating the cutting tool from the workpiece.

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