Holder, cutting tool, and method for manufacturing cut workpiece

Abstract

To provide a holder in which the relative position between a first member and a second member can be easily stabilized.SOLUTION: Multiple raised portions include a first raised portion having a first end surface located at an end in the extending direction of the raised portions. Multiple grooves include a first groove having a second end surface facing the first end surface.SELECTED DRAWING: Figure 13

Description

[Technical Field]

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

[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 front 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 the head can be fixed to the shank by fitting these grooves together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2001-514086 Summary of the Invention [Problem to be solved by the invention]

[0005] 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. [Means for solving the problem]

[0006] In one non-limiting embodiment of the present disclosure, 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 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 raised portions extending parallel to each other and fitting into the plurality of grooves. The plurality of raised portions has a first raised portion having a first end face located at an end in the extension direction of the plurality of raised portions, and the plurality of grooves has a first groove having a second end face facing the first end face. [Effects of the Invention]

[0007] In the holder in the above aspect, the relative positions of the first and second members constituting the holder tend to be stable. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a top view showing a schematic configuration of a cutting tool according to each of first and second embodiments of the present disclosure. [Figure 2] 1 is a top view showing a schematic configuration of a holder according to a first embodiment of the present disclosure. [Figure 3] 1 is a side view showing a schematic configuration of a holder according to a first embodiment of the present disclosure. [Figure 4] 1 is a perspective view showing a schematic configuration of a holder according to a first embodiment of the present disclosure. [Figure 5] 1 is an exploded top view showing a schematic configuration of a holder according to a first embodiment of the present disclosure. [Figure 6] 1 is an exploded side view showing a schematic configuration of a holder according to a first embodiment of the present disclosure. [Figure 7] 1 is an exploded perspective view showing a schematic configuration of a holder according to a first embodiment of the present disclosure, viewed from the tip side. [Figure 8] 1 is an exploded perspective view showing a schematic configuration of a holder according to a first embodiment of the present disclosure, viewed from the rear end side. [Figure 9] FIG. 2 is a front view of the first opposing surface. [Figure 10] 10 is a view of the first member as seen in the direction X in FIG. 9. [Figure 11] FIG. 4 is a front view of the second opposing surface. [Figure 12] 12 is a view of the second member as seen in the direction XII of FIG. 11. [Figure 13] FIG. 10 is a perspective view of the engagement between the groove and the protrusion, as seen from the tip side. [Figure 14] 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13. [Figure 15] FIG. 10 is a cross-sectional view showing another example of a groove. [Figure 16] FIG. 11 is a top view showing step D1 in the method for manufacturing a machined product according to the third embodiment of the present disclosure. [Figure 17] FIG. 11 is a top view showing step D2 in the method for manufacturing a machined product according to the third embodiment of the present disclosure. [Figure 18] FIG. 11 is a top view showing step D3 in the method for manufacturing a machined product according to the third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] 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.

[0010] [Embodiment 1] 1 is a top view showing a schematic configuration of a cutting tool 201 according to a first 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.

[0011] Examples of materials for the cutting insert 102 include cemented carbide and cermet.

[0012] 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.

[0013] 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 whose main component is a titanium compound. Examples of the cermet whose main component is a titanium compound include titanium carbide (TiC) and titanium nitride (TiN).

[0014] Fig. 2 is a top view showing a schematic configuration of holder 101 according to embodiment 1 of the present disclosure. Fig. 3 is a side view showing a schematic configuration of holder 101 according to embodiment 1 of the present disclosure. Fig. 4 is a perspective view showing a schematic configuration of holder 101 according to embodiment 1 of the present disclosure.

[0015] Fig. 5 is an exploded top view showing a schematic configuration of the holder 101 according to the first embodiment of the present disclosure. Fig. 6 is an exploded side view showing a schematic configuration of the holder 101 according to the first embodiment of the present disclosure. Fig. 7 is an exploded perspective view showing a schematic configuration of the holder 101 according to the first embodiment of the present disclosure, as viewed from the front end 1 side. Fig. 8 is an exploded perspective view showing a schematic configuration of the holder 101 according to the first embodiment of the present disclosure, as viewed from the rear end 2 side.

[0016] 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, but may also mean that the two members 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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 ridges 9. The plurality of ridges 9 may extend parallel to each other. The plurality of ridges 9 may fit into the plurality of grooves 8, respectively. According to Figures 7 and 8, the first opposing surface 6 has a plurality of grooves 8 and the second opposing surface 7 has a plurality of ridges 9, but the first opposing surface 6 may have a plurality of ridges 9 and the second opposing surface 7 may have a plurality of grooves 8.

[0021] Fig. 9 is a front view of the first opposing surface 6. Fig. 10 is a view of the first member 3 as viewed in direction X in Fig. 9. Fig. 11 is a front view of the second opposing surface 7. Fig. 12 is a view of the second member 4 as viewed in direction XII in Fig. 11.

[0022] The plurality of ridges 9 may have a first ridge 10. The first ridge 10 may have a first end face 11. The first end face 11 may be located at an end of the plurality of ridges 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 face 13. The second end face 13 may face the first end face 11.

[0023] 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.

[0024] 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 tend to be more stable.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 with increasing distance 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.

[0029] 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 with the cutting tool 201, thereby reducing the risk of the positions of the first member 3 and the second member 4 being significantly misaligned relative to each other.

[0030] 13 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. 14 is a cross-sectional view taken along line XIV-XIV in FIG.

[0031] In a cross section perpendicular to the direction in which the plurality of grooves 8 extend, the plurality of 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 plurality of grooves 8 extend may be a cross section taken along line XIV-XIV in FIG. 13 . 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, which allows the raised portion 9 to be smoothly inserted into the groove 8 and makes it easy to fit the groove 8 and the raised portion 9 together.

[0032] FIG. 15 is a cross-sectional view showing another example of 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 of force, and therefore the first inner surface 19 can absorb the principal component of force with high efficiency, thereby reducing vibration of the cutting tool 201 during cutting with the cutting tool 201.

[0033] [Embodiment 2] 1 is also a top view showing a schematic configuration of a cutting tool 201 according to a second embodiment of the present disclosure. The cutting tool 201 may have a holder 101 and a cutting insert 102 positioned in a pocket 5.

[0034] 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.

[0035] [Embodiment 3] Fig. 16 is a top view showing step D1 in the method for manufacturing a machined product 401 according to the third embodiment of the present disclosure. Fig. 17 is a top view showing step D2 in the method for manufacturing a machined product 401 according to the third embodiment of the present disclosure. Fig. 18 is a top view showing step D3 in the method for manufacturing a machined product 401 according to the third embodiment of the present disclosure. The method for manufacturing a machined product 401 may include steps D1 to D3.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The manufacturing method for 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 for 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.

[0040] If cutting processing is to be continued after step D3, the workpiece 301 is kept rotating and the step of contacting the cutting edge of the cutting insert 102 of the cutting tool 201 with different locations on the workpiece 301 is repeated.

[0041] Although the holder 101, cutting tool 201, and machined product 401 have been illustrated above, this aspect is not limited to the above-described embodiments and may be any as long as it does not deviate from the gist of this aspect.

[0042] 〔summary〕 A holder according to aspect 1 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 respectively 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.

[0043] A holder according to a second aspect of the present disclosure is related to the first aspect, wherein the first end surface has a convex curved shape and the second end surface has a concave curved shape.

[0044] A holder according to aspect 3 of the present disclosure is the same as that of aspect 1 or 2, 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.

[0045] A holder according to aspect 4 of the present disclosure is similar to aspect 3 in 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 opens to the tip surface, the upper surface, and the side surface, and the multiple grooves are inclined so as to approach the upper surface as they move away from the side surface.

[0046] A holder according to a fifth aspect of the present disclosure is similar to the fourth aspect, wherein the first groove is spaced apart from the upper surface.

[0047] A holder according to aspect 6 of the present disclosure is any one of aspects 1 to 5, 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.

[0048] A holder according to aspect 7 of the present disclosure is the same as in aspect 6, 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 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.

[0049] The cutting tool according to an eighth aspect of the present disclosure is the cutting tool of any one of the first to seventh aspects, and includes the holder and a cutting insert positioned in the pocket.

[0050] A manufacturing method for a machined product according to aspect 9 of the present disclosure is the same as that of aspect 8, and 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.

[0051] 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. [Explanation of symbols]

[0052] 1 Tip 2 Rear end 3 First member 4 Second member 5 pockets 6 First opposing surface 7 Second opposing surface 8 grooves 9 Ridges 10 1st protuberance 11 First end surface 12 First groove 13 Second end face 14 protrusions 15 recess 16 Tip surface 17 Top side 18 Side 19 1st inner surface 20 Second inner surface 101 Holder 102 Cutting insert 201 Cutting tools 301 Work material 401 Cutting workpiece A1 Reference axis θ Angle between the first inner surface and the second inner surface θ1 1st angle θ2 Second angle

Claims

1. A shape extending from the front end to the rear end along a reference axis, A first member; a second member located closer to the rear end than the first member, The first member is a pocket located on the side of the tip, into which a cutting insert can be attached; a first opposing surface located on the rear end side and opposing the second member, the second member has a second opposing surface located on the tip side and opposing 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 extending parallel to each other and fitted into the plurality of grooves, the plurality of raised portions include a first raised portion having a first end surface located at an end in an extension direction of the plurality of raised portions, The plurality of grooves include a first groove having a second end surface opposite the first end surface.

2. The holder according to claim 1 , wherein the first end surface is a convex curved surface and the second end surface is a concave curved surface.

3. 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, The holder of claim 1 , wherein the second opposing surface has the plurality of ridges.

4. The first member is a tip surface located on the tip side; an upper surface extending from the tip surface toward the first opposing surface; a side surface extending from the tip surface toward the first opposing surface and adjacent to the top surface, the pocket is open to the tip surface, the top surface, and the side surface; The holder according to claim 3 , wherein the plurality of grooves are inclined so as to approach the upper surface with increasing distance from the side surface.

5. The holder of claim 4 , wherein the first groove is spaced from the top surface.

6. In a cross section perpendicular to the direction in which the plurality of grooves extend, The plurality of grooves are a linear first inner surface; a linear second inner surface facing the first inner surface, The holder according to claim 1 , wherein the first inner surface and the second inner surface form an acute angle.

7. The first member is a tip surface located on the tip side; an upper surface extending from the tip surface toward the first opposing surface; a side surface extending from the tip surface toward the first opposing surface and adjacent to the top surface, the pocket is open to the tip surface, the top surface, and the side surface; In the cross section, the first inner surface is located closer to the top surface than the second inner surface; an angle formed between the reference axis and the first inner surface is a first angle, an angle formed between the reference axis and the second inner surface is a second angle, The holder of claim 6 , wherein the first angle is smaller than the second angle.

8. A holder according to any one of claims 1 to 7; a cutting insert located in the pocket.

9. rotating the workpiece; bringing the cutting tool according to claim 8 into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

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