Method for manufacturing holders, cutting tools, and cut workpieces

Abstract

To realize a holder that can reduce the risk of damaging the machined surface of the workpiece. [Solution] The width of the first ridge in the direction along the third reference axis is greater than the width of the third ridge in the direction along the third reference axis.

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to a holder, a cutting tool, and a method for manufacturing a machined product.

Background Art

[0002] The holder, the cutting tool, and the method for manufacturing a machined product are applied to the cutting of a workpiece. Examples of the cutting may include turning and milling. Examples of the turning may include inner diameter machining, outer diameter machining, grooving, and parting off.

[0003] As a holder of a cutting tool used when cutting a workpiece such as a metal member, for example, the holder described in Patent Document 1 is known. The holder described in Patent Document 1 has a head located on the front end side and a shank located on the rear end side. A plurality of grooves are formed in a sawtooth shape on the opposing surfaces of the head and the shank, and the head can be fixed to the shank by fitting these grooves together.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Among the plurality of grooves in the holder described in Patent Document 1, the grooves located at both ends in the direction orthogonal to the extending direction of these grooves tend to have a narrow width. Since these relatively narrow grooves have low durability, there is a risk of breakage and damage to the machined surface of the workpiece.

Means for Solving the Problems

[0006] A holder in an unspecified aspect of the present disclosure has a shape extending from a front to a rear end along a first reference axis and comprises a first member and a second member located on the rear end side of the first member. The first member has, located on the front end side, a pocket into which a cutting insert can be mounted, and, located on the rear end side, a first opposing surface facing the second member. The second member has, located on the front end side, a second opposing surface facing the first member. One of the first opposing surface and the second opposing surface has a plurality of grooves extending parallel to each other, and the other of the first opposing surface and the second opposing surface has a plurality of protrusions extending parallel to each other and fitting into the plurality of grooves, respectively.

[0007] Assume that the second reference axis extends in a direction parallel to one of the plurality of grooves, and the third reference axis extends perpendicular to the first and second reference axes. In this case, the plurality of grooves include a first groove located at one end in the direction along the third reference axis, a second groove located at the other end in the direction along the third reference axis, and a third groove located between the first and second grooves. The plurality of raised portions include a first raised portion that fits into the first groove, a second raised portion that fits into the second groove, and a third raised portion that fits into the third groove. The width of the first raised portion in the direction along the third reference axis is greater than the width of the third raised portion in the direction along the third reference axis. [Effects of the Invention]

[0008] In one aspect of this disclosure, the holder can reduce the risk of damaging the machined surface of the workpiece. [Brief explanation of the drawing]

[0009] [Figure 1] This is a top view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 2] This is a side view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 3] This is a perspective view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 4] This is an exploded top view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 5] This is an exploded side view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 6] This is an exploded perspective view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 7] This is another exploded perspective view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 8] This is yet another exploded perspective view showing the configuration of the holder according to Embodiment 1 of this disclosure. [Figure 9] This is a front view of the first opposing surface according to Embodiment 1 of the present disclosure. [Figure 10] This is a view of the first member in the direction X shown in Figure 9. [Figure 11] This is a front view of the second opposing surface according to Embodiment 1 of the present disclosure. [Figure 12] This is a view of the second member as seen in direction XII in Figure 11. [Figure 13] This is a perspective view of the fitting state of the groove and raised portion, seen from the tip side. [Figure 14] Figure 13 shows a cross-sectional view from line XIV-XIV. [Figure 15] This is a cross-sectional view showing another example of a groove. [Figure 16] This is a front view of the first opposing surface according to Embodiment 2 of the present disclosure. [Figure 17] This is a front view of the second opposing surface according to Embodiment 2 of the present disclosure. [Figure 18] This is a top view showing the configuration of a cutting tool according to Embodiment 3 of the present disclosure. [Figure 19] This is a top view showing step D1N in the method for manufacturing a machined workpiece according to Embodiment 4 of the present disclosure. [Figure 20] This is a top view showing step D2N in the method for manufacturing a machined workpiece according to Embodiment 4 of the present disclosure. [Figure 21] This is a top view showing step D3N in the method for manufacturing a machined workpiece according to Embodiment 4 of the present disclosure.

Best Mode for Carrying Out the Invention

[0010] A mode for carrying out the present disclosure will be described. For convenience of explanation, members having the same functions as those of the members described above may be denoted by the same reference numerals, and the description thereof may not be repeated.

[0011]

Embodiment 1

[0012] FIG. 4 is an exploded top view showing the configuration of the holder 101N according to Embodiment 1 of the present disclosure. FIG. 5 is an exploded side view showing the configuration of the holder 101N according to Embodiment 1 of the present disclosure. FIG. 6 is an exploded perspective view showing the configuration of the holder 101N according to Embodiment 1 of the present disclosure. FIG. 7 is another exploded perspective view showing the configuration of the holder 101N according to Embodiment 1 of the present disclosure. FIG. 8 is yet another exploded perspective view showing the configuration of the holder 101N according to Embodiment 1 of the present disclosure.

[0013] The holder 101N may have a shape extending from the tip 1N to the rear end 2N along the first reference axis A1N. The shape may be a rod shape. The tip 1N and the rear end 2N may be the tip of the holder 101N and the rear end of the holder 101N, respectively. In the present application, "along" is not limited to the case where two members extend parallel to each other, and the two members may extend with an inclination of 5° or less with respect to each other. The holder 101N can be used to hold a cutting insert 102N described later.

[0014] The holder 101N may include a first member 3N and a second member 4N. The second member 4N may be located on the rear end 2N side with respect to the first member 3N. The first member 3N may be also referred to as a head, and the second member 4N may be also referred to as a shank.

[0015] Examples of the shape of the first member 3N include a cylindrical shape and a polygonal prism shape. Examples of the material of the first member 3N include steel, cast iron, and aluminum alloy. Examples of the shape of the second member 4N include a cylindrical shape and a polygonal prism shape. Examples of the material of the second member 4N include steel, cast iron, and aluminum alloy.

[0016] The first member 3N may have a pocket 5N and a first opposing surface 6N. The pocket 5N may be located on the side of the tip 1N. The pocket 5N may be capable of holding a cutting insert 102N. The first opposing surface 6N may be located on the side of the rear end 2N. The first opposing surface 6N may face the second member 4N.

[0017] The second member 4N may have a second opposing surface 7N. The second opposing surface 7N may be located on the side of the tip 1N. The second opposing surface 7N may face the first member 3N. The shapes of the first opposing surface 6N and the second opposing surface 7N may correspond to each other, such as the outer shape of the first opposing surface 6N and the outer shape of the second opposing surface 7N being congruent.

[0018] One of the first opposing surface 6N and the second opposing surface 7N may have a plurality of grooves 8N. The plurality of grooves 8N may extend parallel to each other. The other of the first opposing surface 6N and the second opposing surface 7N may have a plurality of raised portions 9N. The plurality of raised portions 9N may extend parallel to each other. The plurality of raised portions 9N may each be fitted into a plurality of grooves 8N. The first opposing surface 6N may have a plurality of grooves 8N and the second opposing surface 7N may have a plurality of raised portions 9N, or the first opposing surface 6N may have a plurality of raised portions 9N and the second opposing surface 7N may have a plurality of grooves 8N.

[0019] Figure 9 is a front view of the first opposing surface 6N according to Embodiment 1 of the present disclosure. Figure 10 is a view of the first member 3N in the direction X of Figure 9. Figure 11 is a front view of the second opposing surface 7N according to Embodiment 1 of the present disclosure. Figure 12 is a view of the second member 4N in the direction XII of Figure 11.

[0020] Assume that the second reference axis A2N extends in a direction parallel to one of the multiple grooves 8N, and the third reference axis A3N extends perpendicular to the first reference axis A1N and the second reference axis A2N.

[0021] The multiple grooves 8N may have a first groove 10N, a second groove 11N, and a third groove 12N. The first groove 10N may be located at one end in the direction X3N along the third reference axis A3N. The second groove 11N may be located at the other end in the direction X3N along the third reference axis A3N. The third groove 12N may be located between the first groove 10N and the second groove 11N.

[0022] The multiple raised portions 9N may include a first raised portion 13N, a second raised portion 14N, and a third raised portion 15N. The first raised portion 13N may be fitted into the first groove 10N. The second raised portion 14N may be fitted into the second groove 11N. The third raised portion 15N may be fitted into the third groove 12N.

[0023] The width W13N of the first raised portion 13N in the direction X3N along the third reference axis A3N may be greater than the width W15N of the third raised portion 15N in the direction X3N along the third reference axis A3N.

[0024] With holder 101N, the first raised portion 13N is large in size, resulting in high durability of the first raised portion 13N. Therefore, with holder 101N, the risk of the first raised portion 13N breaking and damaging the machined surface of the workpiece can be reduced. With holder 101N, the relative positions of the first member 3N and the second member 4N constituting holder 101N are more stable.

[0025] The first member 3N may further have a projection 16N protruding from the first opposing surface 6N toward the second member 4N. The second member 4N may further have a recess 17N into which the projection 16N is inserted. The first opposing surface 6N may have a plurality of grooves 8N. The second opposing surface 7N may have a plurality of raised portions 9N.

[0026] The first member 3N and the second member 4N may be fixed to each other by, for example, the following method: Insert the projection 16N of the first member 3N into the recess 17N of the second member 4N. Furthermore, engage the screw 51N with the screw hole 52N formed in the second member 4N and fix it to the hole 53N formed in the projection 16N. This allows the first member 3N and the second member 4N to be strongly fixed to each other. At this time, the screw 51N may be fixed to the hole 53N by bringing the screw 51N into contact with the bottom surface of the hole 53N. Alternatively, the screw 51N may be fixed to the hole 53N by offsetting the hole 53N from the screw hole 52N and bringing the screw 51N into contact with the inner circumferential surface of the hole 53N.

[0027] The projection 16N may have a first projection 18N extending in the direction XAN intersecting the first reference axis A1N, and a second projection 19N projecting from the first projection 18N toward the second member 4N. This provides a first fixing by the first projection 18N fitting into the recess 17N, and a second fixing by the second projection 19N fitting into the recess 17N, thereby allowing the first member 3N and the second member 4N to be strongly fixed to each other. The first fixing may be fixing in the circumferential direction of the first reference axis A1N. The second fixing may be fixing in the radial direction of the first reference axis A1N.

[0028] When the first member 3N is fixed to the second member 4N via the screw 51N, the first projection 18N may be slightly separated from the recess 17N and may not be in contact with the recess 17N. Similarly, the second projection 19N may be slightly separated from the recess 17N and may not be in contact with the recess 17N.

[0029] The projection 16N is not limited to having multiple projections such as the first projection 18N and the second projection 19N, but may be composed of a single projection. For example, the projection 16N may be cylindrical or elliptical.

[0030] The first projection 18N may extend in the direction X2N along the second reference axis A2N. This allows the size of the first projection 18N in the direction X2N along the second reference axis A2N to be increased, thereby enabling the first member 3N and the second member 4N to be stably fixed to each other.

[0031] The height H18N of the first projection 18N in the direction X1N along the first reference axis A1N may be greater than the height H9N of the multiple raised portions 9N in the direction X1N along the first reference axis A1N. This reduces the risk that the multiple raised portions 9N may hinder the first fixing, thereby enabling the first member 3N and the second member 4N to be stably fixed to each other.

[0032] The height H19N of the second protrusion 19N in the direction X1N along the first reference axis A1N may be greater than the height H18N of the first protrusion 18N in the direction X1N along the first reference axis A1N. This allows the second protrusion 19N to fit deeply into the recess 17N, thereby enabling the first member 3N and the second member 4N to be stably fixed to each other, primarily by the second fixing method.

[0033] The first member 3N may further have a tip surface 20N, an upper surface 21N, and a side surface 22N. The tip surface 20N may be located on the side of the tip 1N. The upper surface 21N may extend from the tip surface 20N toward the first opposing surface 6N. The side surface 22N may extend from the tip surface 20N toward the first opposing surface 6N and be adjacent to the upper surface 21N. The pocket 5N may open toward the tip surface 20N, the upper surface 21N, and the side surface 22N. The multiple grooves 8N may be inclined so that they move toward the upper surface 21N as they move away from the side surface 22N. This makes it possible to reduce vibrations of the cutting tool 201N caused by the main force component and vibrations of the cutting tool 201N caused by the feed force component during cutting with the cutting tool 201N described later.

[0034] Figure 13 is a perspective view of the fitted state of groove 8N and raised portion 9N, as seen from the side of tip 1N. Figure 14 is a cross-sectional view of Figure 13 along line XIV-XIV.

[0035] In a cross-section perpendicular to the direction in which the multiple grooves 8N extend, the multiple grooves 8N may have a first inner surface 23N and a second inner surface 24N. The first inner surface 23N may be linear. The second inner surface 24N may be linear and opposite to the first inner surface 23N. The angle θN between the first inner surface 23N and the second inner surface 24N may be acute. The cross-section perpendicular to the direction in which the multiple grooves 8N extend may be the XIV-XIV cross-section in Figure 13. This makes it possible to make the opening size of the groove 8N larger than the size of the tip of the raised portion 9N, so that the raised portion 9N can be smoothly inserted into the groove 8N, and it becomes easy to fit the groove 8N and the raised portion 9N together.

[0036] Figure 15 is a cross-sectional view showing another example of groove 8N. In a cross-section perpendicular to the direction in which the multiple grooves 8N extend, the first inner surface 23N may be located closer to the top surface 21N than to the second inner surface 24N. The angle between the first reference axis A1N and the first inner surface 23N is the first angle θ1N, and the angle between the first reference axis A1N and the second inner surface 24N is the second angle θ2N. The first angle θ1N may be smaller than the second angle θ2N. As a result, the first inner surface 23N is perpendicular or nearly perpendicular to the main component force, so the first inner surface 23N can efficiently receive the main component force, thereby reducing vibration of the cutting tool 201N during cutting.

[0037] The pocket 5N is located on the upper end side of the first member 3N, and the first groove 10N may be located above the third groove 12N. This makes it easier for a large force to be applied to the first raised portion 13N during cutting with the cutting tool 201N, thus highlighting the effect of the holder 101N.

[0038] [Embodiment 2] Figure 16 is a front view of the first opposing surface 6N according to Embodiment 2 of the present disclosure. Figure 17 is a front view of the second opposing surface 7N according to Embodiment 2 of the present disclosure.

[0039] In the holder 101N, the width W14N of the second raised portion 14N in the direction X3N along the third reference axis A3N may be greater than the width W15N of the third raised portion 15N in the direction X3N along the third reference axis A3N.

[0040] According to holder 101N, the second raised portion 14N is large in size, resulting in high durability of the second raised portion 14N. Therefore, with holder 101N, the risk of the second raised portion 14N breaking and damaging the machined surface of the workpiece can be reduced.

[0041] [Embodiment 3] Figure 18 is a top view showing the configuration of a cutting tool 201N according to Embodiment 3 of the present disclosure. The cutting tool 201N is used in the cutting of a workpiece to manufacture a cut workpiece. The cutting tool 201N may have a holder 101N and a cutting insert 102N located in a pocket 5N.

[0042] Examples of materials for the cutting insert 102N include cemented carbide and cermet.

[0043] Examples of cemented carbide compositions include WC-Co, WC-TiC-Co, and WC-TiC-TaC-Co. WC-Co may be produced by adding cobalt (Co) powder to tungsten carbide (WC) and sintering it. WC-TiC-Co may be obtained by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co may be obtained by adding tantalum carbide (TaC) to WC-TiC-Co.

[0044] A cermet may be a sintered composite material in which a metal is compounded with a ceramic component. Specifically, a cermet can be one in which a titanium compound is the main component. Examples of cermets with a titanium compound as the main component include titanium carbide (TiC) or titanium nitride (TiN).

[0045] [Embodiment 4] Figure 19 is a top view showing step D1N in the manufacturing method of the machined product 401N according to Embodiment 4 of this disclosure. Figure 20 is a top view showing step D2N in the manufacturing method of the machined product 401N according to Embodiment 4 of this disclosure. Figure 21 is a top view showing step D3N in the manufacturing method of the machined product 401N according to Embodiment 4 of this disclosure. The manufacturing method of the machined product 401N may include steps D1N to D3N.

[0046] Step D1N is a step in which the workpiece 301N is rotated. The workpiece 301N may be rotated around its rotation axis A351N. Examples of materials for the workpiece 301N include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0047] Step D2N is the step of bringing the cutting tool 201N into contact with the rotating workpiece 301N. At least one of the rotating workpiece 301N and the cutting tool 201N may be moved to bring the cutting tool 201N closer to the rotating workpiece 301N. The cutting edge of the cutting insert 102N of the cutting tool 201N may be brought into contact with the workpiece 301N to cut the workpiece 301N.

[0048] Step D3N is the step of separating the cutting tool 201N from the workpiece 301N. The cutting tool 201N may be separated from the workpiece 301N by moving at least one of the cutting tool 201N and the workpiece 301N, thereby obtaining the cut workpiece 401N.

[0049] In the method for manufacturing the cut workpiece 401N, a cutting tool 201N having a holder 101N that can reduce the risk of damaging the machined surface of the workpiece 301N is used. Therefore, according to the method for manufacturing the cut workpiece 401N, the workpiece 301N can be cut with excellent machining accuracy, and a cut workpiece 401N with a highly accurate machined surface can be obtained.

[0050] If cutting is to be continued after process D3N, the process should be repeated by maintaining the rotation of the workpiece 301N and bringing the cutting edge of the cutting insert 102N of the cutting tool 201N into contact with different parts of the workpiece 301N.

[0051] The above examples illustrate the manufacturing methods for the holder 101N, the cutting tool 201N, and the workpiece 401N. However, the present embodiment is not limited to the above-described embodiment and can be any as long as it does not deviate from the spirit of the present embodiment.

[0052] 〔summary〕 A holder according to Embodiment 1 of the present disclosure has a shape extending from a front end to a rear end along a first reference axis and comprises a first member and a second member located on the rear end side of the first member, the first member having a pocket on the front end side into which a cutting insert can be attached and a first opposing surface on the rear end side facing the second member, the second member having a second opposing surface on the front end side facing the first member, one of the first opposing surface and the second opposing surface having a plurality of grooves extending parallel to each other, and the other of the first opposing surface and the second opposing surface having a plurality of protrusions extending parallel to each other and fitting into the plurality of grooves, respectively, Assuming that the two reference axes extend in a direction parallel to one of the plurality of grooves, and the third reference axis extends perpendicular to the first and second reference axes, the plurality of grooves have a first groove located at one end in the direction along the third reference axis, a second groove located at the other end in the direction along the third reference axis, and a third groove located between the first and second grooves, and the plurality of raised portions have a first raised portion that fits into the first groove, a second raised portion that fits into the second groove, and a third raised portion that fits into the third groove, and the width of the first raised portion in the direction along the third reference axis is greater than the width of the third raised portion in the direction along the third reference axis.

[0053] A holder according to embodiment 2 of the present disclosure, in embodiment 1, wherein the first member further has a projection protruding from the first opposing surface toward the second member, the second member further has a recess into which the projection is inserted, the first opposing surface has the plurality of grooves, and the second opposing surface has the plurality of raised portions.

[0054] The holder according to embodiment 3 of the present disclosure, in embodiment 2, has a projection that extends in a direction intersecting the first reference axis and a second projection that protrudes from the first projection toward the second member.

[0055] In the holder according to embodiment 4 of the present disclosure, in embodiment 3, the first projection extends in a direction along the second reference axis.

[0056] In the holder according to aspect 5 of the present disclosure, in aspect 3 or 4, the height of the first projection in the direction along the first reference axis is greater than the height of the plurality of raised portions in the direction along the first reference axis.

[0057] In any of embodiments 3 to 5, the holder according to embodiment 6 of the present disclosure is characterized in that the height of the second projection in the direction along the first reference axis is greater than the height of the first projection in the direction along the first reference axis.

[0058] A holder according to embodiment 7 of the present disclosure, in any of embodiments 2 to 6, the first member further has a tip surface located on the tip side, an upper surface extending from the tip surface toward the first opposing surface, and a side surface extending from the tip surface toward the first opposing surface and adjacent to the upper surface, wherein the pocket opens toward the tip surface, the upper surface, and the side surface, and the plurality of grooves are inclined to move toward the upper surface as they move away from the side surface.

[0059] The holder according to aspect 8 of the present disclosure, in any of aspects 1 to 7, in a cross section perpendicular to the direction in which the plurality of grooves extend, the plurality of grooves have a linear first inner surface and a linear second inner surface opposite to the first inner surface, and the angle between the first inner surface and the second inner surface is acute.

[0060] A holder according to aspect 9 of the present disclosure, in aspect 8, further comprises a first member having a tip surface located on the tip side, an upper surface extending from the tip surface toward the first opposing surface, and a side surface extending from the tip surface toward the first opposing surface and adjacent to the upper surface, wherein the pocket opens toward the tip surface, the upper surface, and the side surface, and in the cross-section, the first inner surface is located closer to the upper surface than the second inner surface, the angle between the first reference axis and the first inner surface is the first angle, the angle between the first reference axis and the second inner surface is the second angle, and the first angle is smaller than the second angle.

[0061] In the holder according to embodiment 10 of the present disclosure, in any of embodiments 1 to 9, the pocket is located on the upper end side of the first member, and the first groove is located above the third groove.

[0062] In any of embodiments 1 to 10, the holder according to embodiment 11 of the present disclosure is characterized in that the width of the second protrusion in the direction along the third reference axis is greater than the width of the third protrusion in the direction along the third reference axis.

[0063] A cutting tool according to aspect 12 of the present disclosure comprises, in any of aspects 1 to 11, the holder and a cutting insert located in the pocket.

[0064] A method for manufacturing a machined workpiece according to aspect 13 of the present disclosure includes, in aspect 12, a step of rotating a workpiece, a step of bringing the cutting tool into contact with the rotating workpiece, and a step of moving the cutting tool away from the workpiece.

[0065] The inventions described in this disclosure have been explained above 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]

[0066] 1N tip 2N rear end 3N First Member 4N Second Member 5N Pocket 6N First opposing surface 7N Second opposing surface 8N groove 9N ridge 10N 1st groove 11N 2nd groove 12N 3rd groove 13N 1st protuberance 14N 2nd raised part 15N 3rd raised part 16N protrusion 17N recess 18N 1st protrusion 19N 2nd protrusion 20N tip surface 21N top surface 22N side 23N 1st inner surface 24N 2nd inner surface 101N Holder 102N Cutting Insert 201N cutting tool 301N workpiece material 401N cutting workpiece A1N 1st reference axis A2N 2nd reference axis A3N 3rd reference axis H9N Height of multiple raised areas in the direction along the first reference axis H18N Height of the first projection in the direction along the first reference axis H19N Height of the second projection in the direction along the first reference axis W13N Width of the first raised portion in the direction along the third reference axis W14N Width of the second ridge in the direction along the third reference axis W15N Width of the third raised portion in the direction along the third reference axis X1N Direction along the first reference axis X2N Direction along the second reference axis X3N Direction along the third reference axis XAN Direction intersecting the first reference axis θN Angle between the first inner surface and the second inner surface θ1N 1st angle θ2N 2nd angle

Claims

1. It has a shape that extends from the tip to the rear end along the first reference axis, First member and It comprises a second member located closer to the rear end than the first member, The first member is, Located on the tip side, there is a pocket into which a cutting insert can be attached, It has a first opposing surface located on the side of the rear end and facing the second member, The second member is located on the tip side and has a second opposing surface that faces the first member, One of the first opposing surface and the second opposing surface has a plurality of grooves extending parallel to each other, The other of the first opposing surface and the second opposing surface has a plurality of raised portions that extend parallel to each other and fit into the plurality of grooves, Assuming that the second reference axis extends in a direction parallel to one of the plurality of grooves, and the third reference axis extends perpendicular to the first reference axis and the second reference axis, The aforementioned multiple grooves are, A first groove located at one end in the direction along the third reference axis, A second groove located at the other end in the direction along the third reference axis, It has a third groove positioned between the first groove and the second groove, The aforementioned multiple raised portions are, A first raised portion that fits into the first groove, A second raised portion that fits into the second groove, It has a third raised portion that fits into the third groove, A holder in which the width of the first protrusion in the direction along the third reference axis is greater than the width of the third protrusion in the direction along the third reference axis.

2. The first member further has a projection that protrudes from the first opposing surface toward the second member, The second member further has a recess into which the projection is inserted, The first opposing surface has the plurality of grooves, The holder according to claim 1, wherein the second opposing surface has the plurality of raised portions.

3. The aforementioned protrusion is A first projection extending in a direction intersecting the first reference axis, The holder according to claim 2, further comprising a second projection extending from the first projection toward the second member.

4. The holder according to claim 3, wherein the first projection extends in a direction along the second reference axis.

5. The holder according to claim 3, wherein the height of the first projection in the direction along the first reference axis is greater than the height of the plurality of raised portions in the direction along the first reference axis.

6. The holder according to claim 3, wherein the height of the second projection in the direction along the first reference axis is greater than the height of the first projection in the direction along the first reference axis.

7. The first member is, The tip surface located on the side of the aforementioned tip, An upper surface extending from the tip surface toward the first opposing surface, It further has a side surface that extends from the tip surface toward the first opposing surface and is adjacent to the upper surface, The pocket opens to the front surface, the top surface, and the side surface, The holder according to claim 2, wherein the plurality of grooves are inclined so as they move away from the side surface and approach the top surface.

8. In a cross-section perpendicular to the direction in which the plurality of grooves extend, The aforementioned multiple grooves are, A straight first inner surface, It has a linear second inner surface facing the first inner surface, The holder according to claim 1, wherein the angle between the first inner surface and the second inner surface is acute.

9. The first member is, The tip surface located on the side of the aforementioned tip, An upper surface extending from the tip surface toward the first opposing surface, It further has a side surface that extends from the tip surface toward the first opposing surface and is adjacent to the upper surface, The pocket opens to the front surface, the top surface, and the side surface, In the cross-section, The first inner surface is located closer to the upper surface than the second inner surface. The angle between the first reference axis and the first inner surface is the first angle, The angle between the first reference axis and the second inner surface is the second angle, The holder according to claim 8, wherein the first angle is smaller than the second angle.

10. The pocket is located on the upper end side of the first member, The holder according to claim 1, wherein the first groove is located above the third groove.

11. The holder according to claim 1, wherein the width of the second protrusion in the direction along the third reference axis is greater than the width of the third protrusion in the direction along the third reference axis.

12. A holder according to any one of claims 1 to 11, A cutting tool having a cutting insert located in the aforementioned pocket.

13. The process of rotating the workpiece, A step of bringing the cutting tool described in claim 12 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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