Holder, cutting tool, and method for manufacturing cut workpiece

Abstract

The present invention realizes a holder with which it is possible to reduce the risk of damaging a work surface of a material to be cut. The width of a first ridge in the direction along a third reference axis is greater than the width of a third ridge in the direction along the third reference axis.

Description

Holder, cutting tool, and method for manufacturing machined product

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

[0002] The holder, cutting tool, and manufacturing method of the machined product are applied to cutting of a workpiece. Examples of cutting include turning and milling. Examples of turning include internal diameter machining, external diameter machining, grooving, and cut-off.

[0003] A holder described in Patent Document 1 is known as a holder for a cutting tool used when cutting a workpiece such as a metal member. The holder described in Patent Document 1 has a head located at the leading end and a shank located at the rear end. A plurality of grooves are formed in a sawtooth shape on the opposing surfaces of the head and the shank, and these grooves fit together to secure the head to the shank.

[0004] Japanese Patent Publication No. 2001-514086

[0005] In one non-limiting aspect of the present disclosure, a holder has a shape extending from a front end to a rear end along a first reference axis and includes a first member and a second member located closer to the rear end than the first member. The first member has a pocket located closer to the front end, into which a cutting insert can be attached, and a first opposing surface located closer to the rear end and facing the second member. The second member has a second opposing surface located closer to the front end and 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 ridges extending parallel to each other and fitting into the plurality of grooves.

[0006] A second reference axis extends in a direction parallel to one of the plurality of grooves, and a third reference axis extends perpendicular to the first reference axis and the second reference axis. The plurality of grooves includes a first groove located at one end in a direction along the third reference axis, a second groove located at the other end in a direction along the third reference axis, and a third groove located between the first groove and the second groove. 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.

[0007] 11 is a top view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 12 is a side view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 13 is a perspective view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 14 is an exploded top view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 15 is an exploded side view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 16 is an exploded perspective view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 17 is another exploded perspective view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 18 is yet another exploded perspective view showing the configuration of a holder according to embodiment 1 of the present disclosure. FIG. 19 is a front view of a first opposing surface according to embodiment 1 of the present disclosure. FIG. 19 is a view of a first member as viewed in direction X of FIG. 9. FIG. 20 is a front view of a second opposing surface according to embodiment 1 of the present disclosure. FIG. 21 is a view of a second member as viewed in direction XII of FIG. 11. FIG. 22 is a perspective view showing the engagement state of a groove and a protrusion as viewed from the tip side. FIG. 23 is a cross-sectional view taken along XIV-XIV of FIG. 13. FIG. 24 is a cross-sectional view showing another example of a groove. FIG. 25 is a front view of a first opposing surface according to embodiment 2 of the present disclosure. FIG. 26 is a front view of a second opposing surface according to embodiment 2 of the present disclosure. FIG. 27 is a top view showing the configuration of a cutting tool according to embodiment 3 of the present disclosure. 32 is a top view showing step D1N in the method for manufacturing a machined product according to embodiment 4 of the present disclosure. FIG. 33 is a top view showing step D2N in the method for manufacturing a machined product according to embodiment 4 of the present disclosure. FIG. 34 is a top view showing step D3N in the method for manufacturing a machined product according to embodiment 4 of the present disclosure. FIG. 35 is a top view showing a schematic configuration of a cutting tool according to embodiments 5 and 6 of the present disclosure. FIG. 36 is a top view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure. FIG. 37 is a side view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure. FIG. 38 is a perspective view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure. FIG. 39 is an exploded top view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure. FIG. 39 is an exploded side view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure. FIG. 39 is an exploded perspective view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure, viewed from the front end side. FIG. 39 is an exploded perspective view showing a schematic configuration of a holder according to embodiment 5 of the present disclosure, viewed from the rear end side. FIG. 39 is a front view of the first opposing surface. FIG. 30 is a view of the first member as viewed in the direction XXXI of FIG. 30. FIG. 31 is a front view of the second opposing surface. FIG. 31 is a view of the second member as viewed in the direction XXXIII of FIG. 32. 34 is a perspective view of the groove and the protrusion, seen from the tip side, showing the mating state of the groove and the protrusion.Fig. 10 is a cross-sectional view showing another example of a groove; Fig. 11 is a top view showing step D1 in the method for manufacturing a machined product according to embodiment 7 of the present disclosure; Fig. 12 is a top view showing step D2 in the method for manufacturing a machined product according to embodiment 7 of the present disclosure; Fig. 13 is a top view showing step D3 in the method for manufacturing a machined product according to embodiment 7 of the present disclosure.

[0008] Among the multiple grooves in the holder described in Patent Document 1, the grooves located at both ends in a direction perpendicular to the direction in which the grooves extend tend to be narrow. These relatively narrow grooves have low durability and may break and damage the machined surface of the workpiece.

[0009] In the holder according to one aspect of the present disclosure, the risk of damaging the machined surface of the workpiece can be reduced.

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present disclosure. For convenience of explanation, the same reference numerals are used to designate components having the same functions as those previously described, and the description thereof may not be repeated.

[0011] [Embodiment 1] Fig. 1 is a top view showing the configuration of a holder 101N according to embodiment 1 of the present disclosure. Fig. 2 is a side view showing the configuration of the holder 101N according to embodiment 1 of the present disclosure. Fig. 3 is a perspective view showing the configuration of the holder 101N according to embodiment 1 of the present disclosure.

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

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

[0014] The holder 101N may have a first member 3N and a second member 4N. The second member 4N may be located closer to the rear end 2N than the first member 3N. The first member 3N may also be called a head, and the second member 4N may also be called 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 leading end 1N. The pocket 5N may be capable of mounting a cutting insert 102N. The first opposing surface 6N may be located on the side of the trailing 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 shapes of the first opposing surface 6N and 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 one another. 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 one another. The plurality of raised portions 9N may fit into the plurality of grooves 8N, respectively. 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] Fig. 9 is a front view of a first opposing surface 6N according to the first embodiment of the present disclosure. Fig. 10 is a view of a first member 3N as viewed in direction X in Fig. 9. Fig. 11 is a front view of a second opposing surface 7N according to the first embodiment of the present disclosure. Fig. 12 is a view of a second member 4N as viewed in direction XII in Fig. 11.

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

[0021] The plurality of grooves 8N may include 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 plurality of 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 fit into the first groove 10N. The second raised portion 14N may fit into the second groove 11N. The third raised portion 15N may fit 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. If the length of the first raised portion 13N in the direction X3N along the third reference axis A3N is not constant, the maximum value of this length may be used as the width W13N of the first raised portion 13N. Similarly, if the length of the third raised portion 15N in the direction X3N along the third reference axis A3N is not constant, the maximum value of this length may be used as the width W15N of the third raised portion 15N.

[0024] The holder 101N has a large first protrusion 13N, which makes the first protrusion 13N highly durable. Therefore, the holder 101N reduces the risk of the first protrusion 13N breaking and damaging the machined surface of the workpiece. The holder 101N also makes it easier to stabilize the relative positions of the first member 3N and the second member 4N that constitute the holder 101N.

[0025] The ratio of the width W13N to the width W15N (W13N / W15N) is not limited to a specific value and can be set to, for example, about 1.1 to 5.

[0026] The first member 3N may further have a protrusion 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 protrusion 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.

[0027] The first member 3N and the second member 4N may be fixed to each other, for example, by the following method: The protrusion 16N of the first member 3N is inserted into the recess 17N of the second member 4N. Furthermore, a screw 51N is engaged with a screw hole 52N formed in the second member 4N and fixed to a hole 53N formed in the protrusion 16N. This allows the first member 3N and the second member 4N to be firmly fixed to each other. At this time, the screw 51N may be fixed to the hole 53N by abutting the bottom surface of the hole 53N. Alternatively, the screw 51N may be fixed to the hole 53N by eccentrically positioning the hole 53N relative to the screw hole 52N and abutting the inner circumferential surface of the hole 53N.

[0028] The protrusion 16N may have a first protruding portion 18N extending in a direction XAN intersecting the first reference axis A1N and a second protruding portion 19N protruding from the first protruding portion 18N toward the second member 4N. This provides a first fixation by fitting the first protruding portion 18N into the recess 17N, and a second fixation by fitting the second protruding portion 19N into the recess 17N, thereby firmly fixing the first member 3N and the second member 4N to each other. The first fixation may be fixation in the circumferential direction of the first reference axis A1N. The second fixation may be fixation in the radial direction of the first reference axis A1N.

[0029] When the first member 3N is fixed to the second member 4N via the screw 51N, the first protrusion 18N may be slightly spaced from the recess 17N and may not be in contact with the recess 17N. Similarly, the second protrusion 19N may be slightly spaced from the recess 17N and may not be in contact with the recess 17N.

[0030] The protrusion 16N is not limited to a configuration having a plurality of protrusions such as the first protrusion 18N and the second protrusion 19N, and may be configured by a single protrusion. For example, the protrusion 16N may have a cylindrical shape or an elliptical cylindrical shape.

[0031] The first protrusion 18N may extend in the direction X2N along the second reference axis A2N, thereby increasing the size of the first protrusion 18N in the direction X2N along the second reference axis A2N, thereby enabling the first member 3N and the second member 4N to be stably fixed to each other.

[0032] The height H18N of the first protrusion 18N in the direction X1N along the first reference axis A1N may be greater than the height H9N of the plurality of raised portions 9N in the direction X1N along the first reference axis A1N, thereby reducing the risk that the plurality of raised portions 9N will interfere with the first fixation, and therefore the first member 3N and the second member 4N can be stably fixed to each other.

[0033] The ratio of the height H18N to the height H9N (H18N / H9N) is not limited to a specific value and may be set to, for example, about 1.1 to 4.

[0034] 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, and therefore the first member 3N and the second member 4N can be stably fixed to each other mainly by the second fixation.

[0035] The ratio of the height H19N to the height H18N (H19N / H18N) is not limited to a specific value and may be set to, for example, about 1.5 to 6.

[0036] 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 be open to the tip surface 20N, the upper surface 21N, and the side surface 22N. The multiple grooves 8N may be inclined so as to approach the upper surface 21N as they move away from the side surface 22N. This reduces vibration of the cutting tool 201N caused by the main component force and vibration of the cutting tool 201N caused by the feed component force during cutting processing using the cutting tool 201N, which will be described later.

[0037] 13 is a perspective view of the groove 8N and the protrusion 9N in a fitted state as viewed from the side of the tip 1N. FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG.

[0038] 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 face the first inner surface 23N. The angle θN formed by the first inner surface 23N and the second inner surface 24N may be an acute angle. The cross section perpendicular to the direction in which the multiple grooves 8N extend may be a cross section XIV-XIV in FIG. 13 . This allows the size of the opening of the groove 8N to be larger than the size of the tip of the raised portion 9N, allowing the raised portion 9N to be smoothly inserted into the groove 8N and facilitating the engagement of the groove 8N and the raised portion 9N.

[0039] 15 is a cross-sectional view showing another example of the 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 the second inner surface 24N. The angle between the first reference axis A1N and the first inner surface 23N is a first angle θ1N, and the angle between the first reference axis A1N and the second inner surface 24N is a 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 principal component of force, allowing the first inner surface 23N to efficiently absorb the principal component of force, thereby reducing vibration of the cutting tool 201N during cutting with the cutting tool 201N.

[0040] The angle difference (δθ) between the first angle θ1N and the second angle θ2N is not limited to a specific value and can be set to, for example, about 0.5° to 10°.

[0041] The pocket 5N may be located near the upper end 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 protrusion 13N during cutting processing with the cutting tool 201N, and therefore the effect of the holder 101N is remarkable.

[0042] [Embodiment 2] Fig. 16 is a front view of a first opposing surface 6N according to embodiment 2 of the present disclosure. Fig. 17 is a front view of a second opposing surface 7N according to embodiment 2 of the present disclosure.

[0043] 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 larger than the width W15N of the third raised portion 15N in the direction X3N along the third reference axis A3N.

[0044] The ratio of the width W14N to the width W15N (W14N / W15N) is not limited to a specific value and can be set to, for example, about 1.1 to 5.

[0045] In the holder 101N, the second raised portion 14N has a large size, and therefore the durability of the second raised portion 14N is high. Therefore, the holder 101N can reduce the risk of the second raised portion 14N breaking and damaging the machined surface of the workpiece.

[0046] 17 , a third raised portion 15N having a relatively small width in the direction X3N along the third reference axis A3N is sandwiched between a first raised portion 13N and a second raised portion 14N having a relatively large width in the direction X3N along the third reference axis A3N. When the grooves 8N have the above-described configuration, the state in which the raised portions 9N fit into the grooves 8N is likely to be stable. Therefore, chatter vibrations that occur during cutting of a workpiece can be reduced.

[0047] 18 is a top view showing a configuration of a cutting tool 201N according to a third embodiment of the present disclosure. The cutting tool 201N is used in cutting a workpiece to manufacture a machined product. The cutting tool 201N may include a holder 101N and a cutting insert 102N positioned in a pocket 5N.

[0048] Examples of the material of the cutting insert 102N include cemented carbide and cermet.

[0049] 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 the mixture. WC-TiC-Co may be produced by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co may be produced by adding tantalum carbide (TaC) to WC-TiC-Co.

[0050] The cermet may be a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be a cermet containing a titanium compound as a main component. Examples of the cermet containing a titanium compound as a main component include titanium carbide (TiC) and titanium nitride (TiN).

[0051] [Embodiment 4] Figure 19 is a top view showing step D1N in a method for manufacturing a machined product 401N according to embodiment 4 of the present disclosure. Figure 20 is a top view showing step D2N in a method for manufacturing a machined product 401N according to embodiment 4 of the present disclosure. Figure 21 is a top view showing step D3N in a method for manufacturing a machined product 401N according to embodiment 4 of the present disclosure. The method for manufacturing a machined product 401N may include steps D1N to D3N.

[0052] Step D1N is a step of rotating the workpiece 301N. The workpiece 301N may be rotated around a rotation axis A351N of the workpiece 301N. Examples of materials for the workpiece 301N include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0053] Step D2N is a 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 relatively 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.

[0054] Step D3N is a step of separating the cutting tool 201N from the workpiece 301N. At least one of the cutting tool 201N and the workpiece 301N may be moved to separate the cutting tool 201N from the workpiece 301N, thereby obtaining a machined product 401N.

[0055] The manufacturing method of the machined product 401N uses a cutting tool 201N having a holder 101N that can reduce the risk of damaging the machined surface of the workpiece 301N. Therefore, according to the manufacturing method of the machined product 401N, the workpiece 301N can be cut with excellent machining accuracy, and the machined product 401N having a highly accurate machined surface can be obtained.

[0056] If cutting processing is to be continued after step D3N, the workpiece 301N is kept rotating and the step of contacting the cutting edge of the cutting insert 102N of the cutting tool 201N with different locations on the workpiece 301N is repeated.

[0057] Although the holder 101N, the cutting tool 201N, and the method for manufacturing the machined product 401N have been exemplified above, this aspect is not limited to the above-described embodiment, and any method may be used as long as it does not deviate from the gist of this aspect.

[0058] In the holder described in Patent Document 1, the relative positions of the head and shank tend to be stably maintained when a cutting load is applied in a direction perpendicular to the groove. On the other hand, when a cutting load is applied in a direction along the groove, the head may slide along this direction, causing the relative positions of the head and shank to become unstable.

[0059] A holder according to one non-limiting aspect of the present disclosure may have the following configuration. The holder has a shape extending from the front end to the rear end along a reference axis and includes a first member and a second member located closer to the rear end than the first member. The first member includes a pocket located closer to the front end to which a cutting insert can be attached, and a first opposing surface located closer to the rear end and facing the second member. The second member includes a second opposing surface located closer to the front end and 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 raised portions extending parallel to each other and fitting into the plurality of grooves. The plurality of raised portions include first raised portions having first end faces located at ends in the direction in which the plurality of raised portions extend, and the plurality of grooves include first grooves having second end faces facing the first end face.

[0060] In the holder of the above aspect, the relative positions of the first and second members constituting the holder tend to be stable.

[0061] 22 is a top view showing a schematic configuration of a cutting tool 201 according to a fifth embodiment of the present disclosure. The cutting tool 201 is used in cutting a workpiece to produce a machined product. The cutting tool 201 may include a holder 101 and a cutting insert 102.

[0062] Examples of materials for the cutting insert 102 include cemented carbide and cermet.

[0063] 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 the mixture. WC-TiC-Co may be produced by adding titanium carbide (TiC) to WC-Co. WC-TiC-TaC-Co may be produced by adding tantalum carbide (TaC) to WC-TiC-Co.

[0064] The cermet may be a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be a cermet containing a titanium compound as a main component. Examples of the cermet containing a titanium compound as a main component include titanium carbide (TiC) and titanium nitride (TiN).

[0065] Fig. 23 is a top view showing a schematic configuration of a holder 101 according to embodiment 5 of the present disclosure. Fig. 24 is a side view showing a schematic configuration of a holder 101 according to embodiment 5 of the present disclosure. Fig. 25 is a perspective view showing a schematic configuration of a holder 101 according to embodiment 5 of the present disclosure.

[0066] Fig. 26 is an exploded top view showing a schematic configuration of the holder 101 according to the fifth embodiment of the present disclosure. Fig. 27 is an exploded side view showing a schematic configuration of the holder 101 according to the fifth embodiment of the present disclosure. Fig. 28 is an exploded perspective view showing a schematic configuration of the holder 101 according to the fifth embodiment of the present disclosure, viewed from the front end 1 side. Fig. 29 is an exploded perspective view showing a schematic configuration of the holder 101 according to the fifth embodiment of the present disclosure, viewed from the rear end 2 side.

[0067] The holder 101 may have a shape extending from the front end 1 to the rear end 2 along the reference axis A1. The shape may be a rod shape. In this application, the term "along" is not limited to two members extending parallel to each other, and the two members may extend at an inclination of 5° or less relative to each other. The holder 101 can be used to hold a cutting insert 102. The holder 101 may have a first member 3 and a second member 4. The second member 4 may be located closer to the rear end 2 than the first member 3. The front end 1 and the rear end 2 may be the front end of the holder 101 and the rear end of the holder 101, respectively. The first member 3 may also be called a head, and the second member 4 may also be called a shank.

[0068] Examples of the shape of the first member 3 include a cylindrical shape and a polygonal prism shape. Examples of the material of the first member 3 include steel, cast iron, and aluminum alloy. Examples of the shape of the second member 4 include a cylindrical shape and a polygonal prism shape. Examples of the material of the second member 4 include steel, cast iron, and aluminum alloy.

[0069] The first member 3 may have a pocket 5 and a first opposing surface 6. The pocket 5 may be located on the side of the leading end 1. The pocket 5 may be capable of mounting a cutting insert 102. The first opposing surface 6 may be located on the side of the trailing end 2. The first opposing surface 6 may face the second member 4.

[0070] The second member 4 may have a second opposing surface 7. The second opposing surface 7 may be located on the side of the tip 1. The second opposing surface 7 may face the first member 3. The shapes of the first opposing surface 6 and the second opposing surface 7 may correspond to each other, such as the outer shapes of the first opposing surface 6 and the second opposing surface 7 being congruent.

[0071] One of the first opposing surface 6 and the second opposing surface 7 may have a plurality of grooves 8. The plurality of grooves 8 may extend parallel to each other. The other of the first opposing surface 6 and the second opposing surface 7 may have a plurality of raised portions 9. The plurality of raised portions 9 may extend parallel to each other. The plurality of raised portions 9 may fit into the plurality of grooves 8, respectively. According to Figures 28 and 29, the first opposing surface 6 has a plurality of grooves 8 and the second opposing surface 7 has a plurality of raised portions 9, but the first opposing surface 6 may have a plurality of raised portions 9 and the second opposing surface 7 may have a plurality of grooves 8.

[0072] Figure 30 is a front view of the first opposing surface 6. Figure 31 is a view of the first member 3 as viewed in the direction XXXI of Figure 30. Figure 32 is a front view of the second opposing surface 7. Figure 33 is a view of the second member 4 as viewed in the direction XXXIII of Figure 32.

[0073] The plurality of raised portions 9 may have a first raised portion 10. The first raised portion 10 may have a first end surface 11. The first end surface 11 may be located at an end of the plurality of raised portions 9 in the extending direction. The plurality of grooves 8 may have a first groove 12. The first groove 12 may have a second end surface 13. The second end surface 13 may face the first end surface 11.

[0074] According to the holder 101, the first end face 11 and the second end face 13 face each other, thereby restricting movement of the first protrusion 10 in the direction along the first groove 12. This reduces the risk that a cutting load applied in the direction along the first groove 12 will cause the first member 3 to slide along this direction, thereby destabilizing the relative positions of the first member 3 and the second member 4. Therefore, in the holder 101, the relative positions of the first member 3 and the second member 4 are likely to be stable.

[0075] The first end face 11 may or may not be in contact with the second end face 13. However, when the first end face 11 is in contact with the second end face 13, the relative positions of the first member 3 and the second member 4 are more likely to be stable.

[0076] The first end face 11 may have a convex curved surface shape, and the second end face 13 may have a concave curved surface shape, thereby reducing the risk of damage to at least one of the first raised portion 10 and the first groove 12 when the first end face 11 and the second end face 13 collide.

[0077] The first member 3 may further have a protrusion 14. The protrusion 14 may protrude from the first opposing surface 6 towards the second member 4. The second member 4 may further have a recess 15. The recess 15 may have the protrusion 14 inserted therein. The first opposing surface 6 may have a plurality of grooves 8. The second opposing surface 7 may have a plurality of raised portions 9.

[0078] The first member 3 and the second member 4 may be fixed to each other, for example, by the following method: The protrusion 14 of the first member 3 is inserted into the recess 15 of the second member 4. Then, a screw 51 is passed through a hole 52 formed in the second member 4 and fastened to a screw hole 53 formed in the protrusion 14. This allows the first member 3 and the second member 4 to be firmly fixed to each other.

[0079] The first member 3 may further have a tip surface 16, an upper surface 17, and a side surface 18. The tip surface 16 may be located on the side of the tip 1. The upper surface 17 may extend from the tip surface 16 toward the first opposing surface 6. The side surface 18 may extend from the tip surface 16 toward the first opposing surface 6. The side surface 18 may be adjacent to the top surface 17. The pocket 5 may be open to the tip surface 16, the upper surface 17, and the side surface 18. The multiple grooves 8 may be inclined so as to approach the top surface 17 as they move away from the side surface 18. This makes it possible to reduce vibration of the cutting tool 201 caused by the main component force and vibration of the cutting tool 201 caused by the feed component force during cutting processing with the cutting tool 201.

[0080] The first groove 12 may be spaced apart from the upper surface 17. This makes it less likely that the first protrusion 10 will slide in the direction in which the first groove 12 extends and come out of the first groove 12 due to the principal force generated during cutting processing by the cutting tool 201, thereby reducing the risk of the positions of the first member 3 and the second member 4 being significantly shifted relative to each other.

[0081] 34 is a perspective view of the engagement between the groove 8 and the protrusion 9, as seen from the side of the tip 1. FIG. 35 is a cross-sectional view taken along the line XXXV-XXXV of FIG.

[0082] In a cross section perpendicular to the direction in which the multiple grooves 8 extend, the multiple grooves 8 may have a first inner surface 19 and a second inner surface 20. The first inner surface 19 may be linear. The second inner surface 20 may face the first inner surface 19. The second inner surface 20 may be linear. The angle θ formed by the first inner surface 19 and the second inner surface 20 may be an acute angle. The cross section perpendicular to the direction in which the multiple grooves 8 extend may be the XXXV-XXXV cross section in FIG. 34 . This allows the size of the opening of the groove 8 to be larger than the size of the tip of the raised portion 9, allowing the raised portion 9 to be smoothly inserted into the groove 8 and facilitating the engagement of the groove 8 and the raised portion 9.

[0083] 36 is a cross-sectional view showing another example of the grooves 8. In a cross section perpendicular to the direction in which the plurality of grooves 8 extend, the first inner surface 19 may be located closer to the top surface 17 than the second inner surface 20. The angle between the reference axis A1 and the first inner surface 19 is a first angle θ1, and the angle between the reference axis A1 and the second inner surface 20 is a second angle θ2. The first angle θ1 may be smaller than the second angle θ2. As a result, the first inner surface 19 is perpendicular or nearly perpendicular to the principal component force, and therefore the first inner surface 19 can absorb the principal component force with high efficiency, thereby reducing vibration of the cutting tool 201 during cutting with the cutting tool 201.

[0084] 22 is also a top view showing a schematic configuration of a cutting tool 201 according to a sixth embodiment of the present disclosure. The cutting tool 201 may have a holder 101 and a cutting insert 102 positioned in the pocket 5.

[0085] The cutting tool 201 has a holder 101 that makes it easy to stabilize the relative positions of the first member 3 and the second member 4, so that it can cut the workpiece with excellent processing accuracy and produce a machined product with a highly accurate processed surface.

[0086] Seventh Embodiment Figure 37 is a top view showing step D1 in a method for manufacturing a machined product 401 according to a seventh embodiment of the present disclosure. Figure 38 is a top view showing step D2 in a method for manufacturing a machined product 401 according to the seventh embodiment of the present disclosure. Figure 39 is a top view showing step D3 in a method for manufacturing a machined product 401 according to the seventh embodiment of the present disclosure. The method for manufacturing the machined product 401 may include steps D1 to D3.

[0087] Step D1 is a step of rotating the workpiece 301. The workpiece 301 may be rotated around a rotation axis A2 of the workpiece 301. Examples of materials for the workpiece 301 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0088] Step D2 is a step of bringing the cutting tool 201 into contact with the rotating workpiece 301. At least one of the rotating workpiece 301 and the cutting tool 201 may be moved to bring the cutting tool 201 relatively closer to the rotating workpiece 301. The cutting edge of the cutting insert 102 of the cutting tool 201 may be brought into contact with the workpiece 301 to cut the workpiece 301.

[0089] Step D3 is a step of separating the cutting tool 201 from the workpiece 301. At least one of the cutting tool 201 and the workpiece 301 may be moved to separate the cutting tool 201 from the workpiece 301, thereby obtaining a machined product 401.

[0090] The manufacturing method of the machined product 401 uses a cutting tool 201 having a holder 101 that easily stabilizes the relative positions of the first member 3 and the second member 4. Therefore, according to the manufacturing method of the machined product 401, the workpiece 301 can be cut with excellent machining accuracy, and the machined product 401 having a highly accurate machined surface can be obtained.

[0091] If cutting processing is to be continued after step D3, the workpiece 301 is kept rotating and the process of contacting the cutting edge of the cutting insert 102 of the cutting tool 201 with different locations on the workpiece 301 is repeated.

[0092] Although the holder 101, the cutting tool 201, and the method for manufacturing the machined product 401 have been exemplified above, this aspect is not limited to the above-described embodiment, and any method may be used as long as it does not deviate from the gist of this aspect.

[0093] [Summary] A holder according to aspect 1 of the present disclosure has a shape extending from a front end to a rear end along a first reference axis, and includes a first member and a second member located closer to the rear end than the first member, the first member having a pocket located closer to the front end to which a cutting insert can be attached, and a first opposing surface located closer to the rear end and facing the second member, the second member having a second opposing surface located closer to the front end and 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, the other of the first opposing surface and the second opposing surface having a plurality of raised portions extending parallel to each other and fitting into the plurality of grooves, When a second reference axis extends in a direction parallel to one of the plurality of grooves and a third reference axis extends perpendicular to the first reference axis and the second reference axis, 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 groove and the second groove, 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.

[0094] A holder according to aspect 2 of the present disclosure is the same as in aspect 1, except that the first member further has a protrusion protruding from the first opposing surface toward the second member, the second member further has a recess into which the protrusion is inserted, the first opposing surface has the plurality of grooves, and the second opposing surface has the plurality of raised portions.

[0095] A holder according to aspect 3 of the present disclosure is similar to aspect 2 in that the protrusion has a first protrusion extending in a direction intersecting the first reference axis and a second protrusion protruding from the first protrusion toward the second member.

[0096] A holder according to a fourth aspect of the present disclosure is the holder of the third aspect, wherein the first protrusion extends in a direction along the second reference axis.

[0097] A holder according to aspect 5 of the present disclosure is the same as that of aspect 3 or 4, wherein the height of the first protrusion in the direction along the first reference axis is greater than the height of the plurality of ridges in the direction along the first reference axis.

[0098] A holder according to aspect 6 of the present disclosure is any one of aspects 3 to 5, wherein the height of the second protrusion in the direction along the first reference axis is greater than the height of the first protrusion in the direction along the first reference axis.

[0099] A holder according to aspect 7 of the present disclosure is any of aspects 2 to 6, wherein 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, the pocket opens to the tip surface, the upper surface, and the side surface, and the plurality of grooves are inclined so as to approach the upper surface as they move away from the side surface.

[0100] A holder according to aspect 8 of the present disclosure is any of aspects 1 to 7, wherein 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 the first inner surface, and the angle between the first inner surface and the second inner surface is an acute angle.

[0101] A holder according to aspect 9 of the present disclosure is the holder according to aspect 8, wherein 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, the pocket is open to 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 a first angle, the angle between the first reference axis and the second inner surface is a second angle, and the first angle is smaller than the second angle.

[0102] A holder according to aspect 10 of the present disclosure is any one of aspects 1 to 9, wherein the pocket is located on the upper end side of the first member, and the first groove is located above the third groove.

[0103] A holder according to aspect 11 of the present disclosure is any one of aspects 1 to 10, wherein the width of the second 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.

[0104] A cutting tool according to a twelfth aspect of the present disclosure is the cutting tool of any one of the first to eleventh aspects, and includes the holder and a cutting insert positioned in the pocket.

[0105] A method for manufacturing a machined product according to aspect 13 of the present disclosure is similar to aspect 12, except that it includes the steps of rotating a workpiece, bringing the cutting tool into contact with the rotating workpiece, and moving the cutting tool away from the workpiece.

[0106] A holder according to aspect 14 of the present disclosure has a shape extending from the front end to the rear end along a reference axis, and includes a first member and a second member located closer to the rear end than the first member, wherein the first member has a pocket located closer to the front end to which a cutting insert can be attached, and a first opposing surface located closer to the rear end and facing the second member, and the second member has a second opposing surface located closer to the front end and 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 raised portions extending parallel to each other and fitting into the plurality of grooves, the plurality of raised portions having first raised portions with first end faces located at ends in the direction in which the plurality of raised portions extend, and the plurality of grooves having first grooves with second end faces facing the first end face.

[0107] A holder according to aspect 15 of the present disclosure is the holder of aspect 14, wherein the first end surface has a convex curved shape and the second end surface has a concave curved shape.

[0108] A holder according to aspect 16 of the present disclosure is the same as in aspect 14 or 15, wherein the first member further has a protrusion protruding from the first opposing surface toward the second member, the second member further has a recess into which the protrusion is inserted, the first opposing surface has the plurality of grooves, and the second opposing surface has the plurality of raised portions.

[0109] A holder according to aspect 17 of the present disclosure is similar to aspect 16, except that 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, the pocket opening to the tip surface, the upper surface, and the side surface, and the plurality of grooves inclined so as to approach the upper surface as they move away from the side surface.

[0110] A holder according to an eighteenth aspect of the present disclosure is similar to the seventeenth aspect, in that the first groove is spaced apart from the upper surface.

[0111] A holder according to aspect 19 of the present disclosure is any of aspects 14 to 18, wherein 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 the first inner surface, and the angle between the first inner surface and the second inner surface is an acute angle.

[0112] A holder according to aspect 20 of the present disclosure is the holder according to aspect 19, wherein 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, the pocket is open to 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 reference axis and the first inner surface is a first angle, the angle between the reference axis and the second inner surface is a second angle, and the first angle is smaller than the second angle.

[0113] A cutting tool according to Aspect 21 of the present disclosure is the cutting tool of any one of Aspects 14 to 20, and includes the holder and a cutting insert positioned in the pocket.

[0114] A manufacturing method for a machined product according to aspect 22 of the present disclosure is similar to aspect 21, except that it includes the steps of rotating a workpiece, bringing the cutting tool into contact with the rotating workpiece, and moving the cutting tool away from the workpiece.

[0115] The invention according to the present disclosure has been described above based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-described embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art could easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure.

[0116] 1N Tip 2N Rear end 3N First member 4N Second member 5N Pocket 6N First opposing surface 7N Second opposing surface 8N Groove 9N Protrusion 10N First groove 11N Second groove 12N Third groove 13N First protrusion 14N Second protrusion 15N Third protrusion 16N Projection 17N Recess 18N First protrusion 19N Second protrusion 20N Tip surface 21N Top surface 22N Side surface 23N First inner surface 24N Second inner surface 101N Holder 102N Cutting insert 201N Cutting tool 301N Work material 401N Cutting workpiece A1N First reference axis A2N Second reference axis A3N 3rd reference axis H9N Height of the plurality of raised portions in the direction along the first reference axis H18N Height of the first protruding portion in the direction along the first reference axis H19N Height of the second protruding portion 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 raised portion 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 First angle θ2N Second angle 1 Front end 2 Rear end 3 First member 4 Second member 5 Pocket 6 First opposing surface 7 Second opposing surface 8 Groove 9 Raised portion 10 First raised portion 11 First end surface 12 First groove 13 Second end surface 14 Protrusion 15 Recess 16 Tip surface 17 Top surface 18 Side surface 19 First inner surface 20 Second inner surface 101 Holder 102 Cutting insert 201 Cutting tool 301 Workpiece 401 Machined product A1 Reference axis θ Angle between the first inner surface and the second inner surface θ1 First angle θ2 Second angle

Claims

1. A cutting tool having a shape extending from a front end to a rear end along a first reference axis, comprising: a first member; and a second member located closer to the rear end than the first member, wherein the first member has: a pocket located closer to the front end and capable of attaching a cutting insert; and a first opposing surface located closer to the rear end and facing the second member, and the second member has a second opposing surface located closer to the front end and facing the first member, wherein 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 raised portions extending parallel to each other and fitting into the plurality of grooves, and wherein a second reference axis extends in a direction parallel to one of the plurality of grooves, and a third reference axis extends perpendicular to the first reference axis and the second reference axis, wherein the plurality of grooves are comprised of: a first groove located at one end in a 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 groove and the second groove, wherein 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, and wherein 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.

2. A holder as described in claim 1, wherein the first member further has a protrusion protruding from the first opposing surface toward the second member, the second member further has a recess into which the protrusion is inserted, the first opposing surface has the plurality of grooves, and the second opposing surface has the plurality of raised portions.

3. A holder as described in claim 2, wherein the protrusion has a first protruding portion extending in a direction intersecting the first reference axis, and a second protruding portion protruding from the first protruding portion toward the second member.

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

5. A holder as described in claim 3 or 4, wherein the height of the first protrusion in the direction along the first reference axis is greater than the height of the plurality of ridges in the direction along the first reference axis.

6. A holder according to any one of claims 3 to 5, wherein the height of the second protrusion in the direction along the first reference axis is greater than the height of the first protrusion in the direction along the first reference axis.

7. A holder as described in any one of claims 2 to 6, wherein 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, the pocket opens to the tip surface, the upper surface, and the side surface, and the plurality of grooves are inclined so as to approach the upper surface as they move away from the side surface.

8. A holder as described in any one of claims 1 to 7, wherein, 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 the first inner surface, and the angle formed by the first inner surface and the second inner surface is an acute angle.

9. A holder as described in claim 8, wherein 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, the pocket opens to 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 formed by the first reference axis and the first inner surface is a first angle, the angle formed by the first reference axis and the second inner surface is a second angle, and the first angle is smaller than the second angle.

10. A holder according to any one of claims 1 to 9, wherein the pocket is located on the upper end side of the first member, and the first groove is located higher than the third groove.

11. A holder according to any one of claims 1 to 10, wherein the width of the second 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.

12. A cutting tool comprising: a holder according to any one of claims 1 to 11; and a cutting insert located in the pocket.

13. A method for manufacturing a machined product, comprising the steps of: rotating a workpiece; bringing the cutting tool according to claim 12 into contact with the rotating workpiece; and separating the cutting tool from the workpiece.

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