Holder, cutting tool, and method for manufacturing cut workpiece

Abstract

The present invention improves the sealability of a first member and a second member by a third member. The exposure height on a second side is greater than the exposure height on a first side, where the exposure height is defined as the sum of a first height and a second height.

Description

Holder, cutting tool, and method for manufacturing a machined product

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

[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 include, for example, turning and milling. Examples of the turning include, for example, inner diameter machining, outer diameter machining, grooving, and parting off.

[0003] As a holder for a cutting tool used when cutting a workpiece, for example, the holder described in Patent Document 1 is known. The holder described in Patent Document 1 includes a main body having a metal member and a first resin member, an antenna member covered with the first resin member, and an annular second resin member positioned between the metal member and the first resin member. Thereby, in the holder described in Patent Document 1, it is difficult for a coolant or the like to enter between the antenna member and the first resin member. Therefore, the antenna member is less likely to deteriorate, and the influence on wireless communication between the antenna member and the outside is small.

[0004] International Publication No. WO2020 / 171157 A1

[0005] A holder in an unlimited aspect of the present disclosure comprises: a first member having a shape extending along a central axis from a first end to a second end, having a rear end face which is the end face on the second end side, and having a recess and a first region on the rear end face; a second member located closer to the second end than the first member, having a front end face which is the end face on the first end side, having a through hole that penetrates from the first end side to the second end side, and having a second region on the front end face; an annular third member made of resin; and a screw that passes through the through hole and is screwed into the recess, wherein the first region and the second region are regions in which the third member is located, and when viewed in plane perspective with respect to a plane perpendicular to the central axis, the recess, the through hole, and the screw The third member is located on the first side with respect to the central axis, and when viewed in plane perspective, the side opposite the first side with respect to the central axis is the second side. The first height is the height at which the third member protrudes from the rear end surface in a first direction parallel to the central axis when the third member is located in the first region and is not pressed by the second member. The second height is the height at which the third member protrudes from the front end surface in a first direction when the third member is located in the second region and is not pressed by the first member. The sum of the first and second heights is the exposed height. The exposed height on the second side is greater than the exposed height on the first side.

[0006] This is a first side view showing the configuration of a cutting tool according to Embodiment 1 of the present disclosure. This is a plan view showing the configuration of a cutting tool according to Embodiment 1 of the present disclosure. This is a second side view showing the configuration of a cutting tool according to Embodiment 1 of the present disclosure. This is a perspective view showing the configuration of a cutting tool according to Embodiment 1 of the present disclosure. This is an exploded perspective view showing the configuration of a cutting tool according to Embodiment 1 of the present disclosure. This is a view of the configuration of a cutting tool according to Embodiment 1 of the present disclosure, seen from the second end to the first end. This is a cross-sectional view taken along line VII-VII in Figure 1. This is an exploded view of the third member and its surroundings. This is another exploded view of the third member and its surroundings. This is a diagram illustrating the position of the second member relative to the first member in the rotational direction about the central axis. This is an exploded view of the third member and its surroundings according to Embodiment 2 of the present disclosure. This is a plan view showing process D1 in the manufacturing method of a machined workpiece according to Embodiment 3 of the present disclosure. This is a plan view showing process D2 in the manufacturing method of a machined workpiece according to Embodiment 3 of the present disclosure. This is a plan view showing process D3 in the manufacturing method of a machined workpiece according to Embodiment 3 of the present disclosure.

[0007] In the holder described in Patent Document 1, there is room to improve the sealing performance of the metal member and the first resin member by the second resin member at a position far from the screw member that fixes the first resin member to the metal member.

[0008] In one aspect of the present disclosure, the sealing performance of the first and second members by the third member can be improved.

[0009] The following describes the forms for implementing this disclosure. For the sake of convenience, components having the same function as those described earlier will be denoted by the same reference numerals, and their descriptions may not be repeated.

[0010] [Embodiment 1] Figure 1 is a first side view showing the configuration of a cutting tool 201 according to Embodiment 1 of the present disclosure. Figure 2 is a plan view showing the configuration of the cutting tool 201. Figure 3 is a second side view showing the configuration of the cutting tool 201. Figure 4 is a perspective view showing the configuration of the cutting tool 201. Figure 5 is an exploded perspective view showing the configuration of the cutting tool 201. Figure 6 is a view showing the configuration of the cutting tool 201, seen from the side of the second end 2 to the side of the first end 1. The side of the cutting tool 201 shown in Figure 1 and the side of the cutting tool 201 shown in Figure 3 may be the front and back sides of the cutting tool 201.

[0011] The cutting tool 201 is used in the cutting of a workpiece to manufacture a machined product. The cutting tool 201 may include a holder 101 and a cutting insert 102 mounted on the holder 101.

[0012] Examples of materials for the cutting insert 102 include cemented carbide and cermet.

[0013] 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.

[0014] 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).

[0015] The holder 101 may have a shape that extends along the central axis A1 from a first end 1 to a second end 2. This shape may be a rod shape. In this application, "along" is not limited to the two members extending parallel to each other, but the two members may extend at an inclination of 5° or less relative to each other. The holder 101 can be used to hold the cutting insert 102. The holder 101 may include a first member 3, a second member 4, a third member 5, and a screw 6.

[0016] The first member 3 may have a rear end face 7 which is the end face on the side of the second end 2. The first member 3 may have a recess 8 and a first region 9 on the rear end face 7. Examples of the shape of the first member 3 include a cylindrical shape and a polygonal prism shape.

[0017] The second member 4 is located closer to the second end 2 than the first member 3. The second member 4 has a tip surface 10, which is the end face on the first end 1 side. The second member 4 has a through hole 11 that penetrates from the first end 1 side to the second end 2 side. The second member 4 has a second region 12 on the tip surface 10. The second region 12 is clearly shown in Figures 8 and 9. Examples of the shape of the second member 4 include a cylindrical shape and a polygonal prism shape.

[0018] The third member 5 is annular and made of resin. The third member 5 may also be a so-called O-ring. The screw 6 passes through the through hole 11 and is screwed into the recess 8.

[0019] The first region 9 and the second region 12 may be the regions where the third member 5 is located. With the third member 5 located in the first region 9 and the second region 12, and the rear end surface 7 and the front end surface 10 facing each other with the third member 5 in between, and with the first member 3 and the second member 4 fixed by screws 6, the first member 3 and the second member 4 can be sealed. Specifically, the risk of coolant or the like used to cool the cutting insert 102 entering the first member 3 and the second member 4 can be reduced.

[0020] The second member 4 may have a side surface 51. The side surface 51 may have a through hole 52 and a recess 53. The holder 101 may include a fourth member 54, a screw 55, and an O-ring 56. The fourth member 54 may cover part or all of the side surface 51. The fourth member 54 may have a through hole 57 and a through hole 58. The screw 55 may pass through the through hole 58 and be screwed into the recess 53. The second member 4 and the fourth member 54 can be sealed with the side surface 51 and the fourth member 54 facing each other with the O-ring 56 in between, and the second member 4 and the fourth member 54 fixed by the screw 55. By overlapping the through holes 52 and 57, it may be possible to pull the member inside the second member 4 out of the holder 101 through the through holes 52 and 57.

[0021] Figure 7 is a cross-sectional view taken along line VII-VII in Figure 1. The cutting tool 201 may include an electronic device 151 within the first member 3. The electronic device 151 may be a sensor.

[0022] Figure 8 is an exploded view of the third member 5 and its surroundings. Figure 9 is another exploded view of the third member 5 and its surroundings.

[0023] When viewed from above with respect to a plane P perpendicular to the central axis A1, the recess 8, the through hole 11, and the screw 6 may be located on the first side S1 with respect to the central axis A1. When viewed from above with respect to plane P, the side opposite to the first side S1 with respect to the central axis A1 is defined as the second side S2. When the third member 5 is located in the first region 9 and is not pressed by the second member 4, the height at which the third member 5 protrudes from the rear end surface 7 in the first direction X parallel to the central axis A1 is defined as the first height T1. When the third member 5 is located in the second region 12 and is not pressed by the first member 3, the height at which the third member 5 protrudes from the front end surface 10 in the first direction X is defined as the second height T2. If the sum of the first height T1 and the second height T2 is defined as the exposed height, the exposed height on the second side S2 (T1 + T2) may be greater than the exposed height on the first side S1 (T1 + T2).

[0024] On the second side S2, which is farther from the screw 6, the gap between the first member 3 and the second member 4 tends to be larger than on the first side S1, which is closer to the screw 6, even after the screw 6 has been fastened. In the holder 101, the exposed height (T1 + T2) on the second side S2 is greater than the exposed height (T1 + T2) on the first side S1. Therefore, in the holder 101, even if the gap between the first member 3 and the second member 4 on the second side S2 is large, the risk of insufficient sealing of the first member 3 and the second member 4 by the third member 5 can be reduced. Consequently, in the holder 101, the sealing performance of the first member 3 and the second member 4 by the third member 5 can be improved.

[0025] At least one of the first region 9 and the second region 12 may be a groove 13 into which a part of the third member 5 fits. The groove 13 may have a first groove portion 14 located on the first side S1 and a second groove portion 15 located on the second side S2. In the first direction X, the second groove portion 15 may be shallower than the first groove portion 14. This makes it easy to realize a configuration in which the exposed height (T1 + T2) on the second side S2 is greater than the exposed height (T1 + T2) on the first side S1.

[0026] Examples of materials for the first member 3 include steel, cast iron, and aluminum alloy. Examples of materials for the second member 4 include resin, steel, cast iron, and aluminum alloy. The materials for the first member 3 and the second member 4 may each be insulating metals. The materials for the first member 3 and the second member 4 may each be metals that have undergone insulating treatment, such as anodizing.

[0027] Figure 10 illustrates the position of the second member 4 relative to the first member 3 in the rotational direction about the central axis A1. Figure 10 shows four examples of this position, and these four examples are denoted by reference numerals 1001, 1002, 1003, and 1004, respectively.

[0028] In the holder 101, four recesses 8 are located at the four corners of the rear end surface 7. In the holder 101, two through holes 11 are located corresponding to two recesses 8 located at two adjacent corners of the rear end surface 7. In the holder 101, two screws 6 pass through the two through holes 11. In the holder 101, the two screws 6 are screwed into the two recesses 8 corresponding to the two through holes 11.

[0029] In the holder 101, the position of the second member 4 relative to the first member 3 in the rotational direction about the central axis A1 can be determined depending on which two of the four recesses 8 correspond to the two through holes 11.

[0030] In the holder 101, if any of the four recesses 8 deteriorate, the risk of insufficient fixing of the first member 3 and the second member 4 can be reduced by fastening with screws 6 while avoiding the deteriorated recess 8.

[0031] In the holder 101, a wire 152 for supplying power to the electronic device 151 can be drawn out from the second member 4. In the holder 101, the second member 4 can be positioned to match the position from which the wire 152 is to be drawn out, and consequently the position of a power supply (not shown) to which the wire 152 is electrically connected.

[0032] [Embodiment 2] Figure 11 is an exploded view of a third member 5 and its surroundings according to Embodiment 2 of the present disclosure. The third member 5 may have a first portion 16 located on the first side S1 and a second portion 17 located on the second side S2. In the first direction X, the thickness H17 of the second portion 17 may be greater than the thickness H16 of the first portion 16. This makes it easy to realize a configuration in which the exposed height (T1 + T2) on the second side S2 is greater than the exposed height (T1 + T2) on the first side S1.

[0033] [Embodiment 3] Figure 12 is a plan view showing step D1 in the manufacturing method of a machined workpiece 401 according to Embodiment 3 of the present disclosure. Figure 13 is a plan view showing step D2 in the manufacturing method of a machined workpiece 401 according to Embodiment 3 of the present disclosure. Figure 14 is a plan view showing step D3 in the manufacturing method of a machined workpiece 401 according to Embodiment 3 of the present disclosure. The manufacturing method of a machined workpiece 401 may include steps D1 to D3.

[0034] Step D1 is a step of rotating the workpiece 301. The workpiece 301 may be rotated around its rotation axis A351. Examples of materials for the workpiece 301 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0035] Step D2 is the 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 closer to the rotating workpiece 301. Alternatively, 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.

[0036] Step D3 is the step of separating the cutting tool 201 from the workpiece 301. The cutting tool 201 may be separated from the workpiece 301 by moving at least one of the cutting tool 201 and the workpiece 301, thereby obtaining the cut workpiece 401.

[0037] In the method for manufacturing the machined workpiece 401, a cutting tool 201 is used that includes a holder 101 with high sealing performance of the first member 3 and the second member 4 by the third member 5. Therefore, in the method for manufacturing the machined workpiece 401, the workpiece 301 can be cut with excellent machining accuracy, and a machined workpiece 401 with a highly accurate machined surface can be obtained.

[0038] If cutting is to be continued after step D3, the process of maintaining the rotation of the workpiece 301 and bringing the cutting edge of the cutting insert 102 of the cutting tool 201 into contact with different parts of the workpiece 301 should be repeated.

[0039] The above examples illustrate the manufacturing methods of the holder 101, the cutting tool 201, and the workpiece 401. However, the present embodiment is not limited to the above-described embodiment and can be any as long as it does not depart from the spirit of the present embodiment.

[0040] [Summary] The holder according to Embodiment 1 of the present disclosure comprises: a first member having a shape extending from a first end to a second end along a central axis, having a rear end face which is the end face on the second end side, and having a recess and a first region on the rear end face; a second member located closer to the second end than the first member, having a front end face which is the end face on the first end side, having a through hole that penetrates from the first end side to the second end side, and having a second region on the front end face; an annular third member made of resin; and a screw that passes through the through hole and is screwed into the recess, wherein the first region and the second region are regions where the third member is located, and when viewed in plane perspective with respect to a plane perpendicular to the central axis, the recess, the through hole, and the screw are front When the third member is located on the first side with respect to the central axis and viewed in plane perspective, the side opposite to the first side with respect to the central axis is defined as the second side, and the height at which the third member protrudes from the rear end surface in a first direction parallel to the central axis when the third member is located in the first region and is not pressed by the second member is defined as the first height, and the height at which the third member protrudes from the front end surface in a first direction when the third member is located in the second region and is not pressed by the first member is defined as the second height, and the sum of the first and second heights is defined as the exposed height, then the exposed height on the second side is greater than the exposed height on the first side.

[0041] The holder according to aspect 2 of the present disclosure, in aspect 1, wherein at least one of the first region and the second region is a groove into which a part of the third member fits, and the groove has a first groove portion located on the first side and a second groove portion located on the second side, wherein in the first direction, the second groove portion is shallower than the first groove portion.

[0042] In the holder according to Aspect 3 of the present disclosure, in the above Aspect 1 or 2, the third member has a first portion located on the first side and a second portion located on the second side, and in the first direction, the thickness of the second portion is greater than the thickness of the first portion.

[0043] In the holder according to Aspect 4 of the present disclosure, in any one of the above Aspects 1 to 3, the material of the first member and the material of the second member are each an insulating metal.

[0044] The cutting tool according to Aspect 5 of the present disclosure includes, in any one of the above Aspects 1 to 4, the holder and a cutting insert attached to the holder.

[0045] The method for manufacturing a machined product according to Aspect 6 of the present disclosure includes, in the above Aspect 5, a step of rotating a workpiece, a step of bringing the cutting tool into contact with the rotating workpiece, and a step of separating the cutting tool from the workpiece.

[0046] As described above, the invention according to the present disclosure has been described based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-described embodiments. That is, the invention according to the present disclosure can be variously modified within the scope shown in 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 those skilled in the art can easily make various deformations or modifications based on the present disclosure. Also, it should be noted that these deformations or modifications are included in the scope of the present disclosure.

[0047] 1. First end 2. Second end 3. First member 4. Second member 5. Third member 6. Screw 7. Rear end face 8. Recess 9. First region 10. Front end face 11. Through hole 12. Second region 13. Groove 14. First groove portion 15. Second groove portion 16. First portion 17. Second portion 101. Holder 102. Cutting insert 201. Cutting tool 301. Workpiece 401. Machined product A1. Central axis H16. Thickness of the first portion H17. Thickness of the second portion P. Plane perpendicular to the central axis S1. First side S2. Second side T1. First height T2. Second height X. First direction

Claims

1. A first member having a shape extending from a first end to a second end along a central axis, having a rear end face which is the end face on the second end side, and having a recess and a first region on the rear end face; a second member located closer to the second end than the first member, having a front end face which is the end face on the first end side, having a through hole that penetrates from the first end side to the second end side, and having a second region on the front end face; an annular third member made of resin; and a screw that passes through the through hole and is screwed into the recess, wherein the first region and the second region are regions in which the third member is located, and when viewed in plane perspective with respect to a plane perpendicular to the central axis, the recess, the through hole, and the screw are located on the first side with respect to the central axis, and when viewed in plane perspective with respect to the plane, the side opposite to the first side with respect to the central axis is the second side. A holder in which, when the third member is located in the first region and the third member is not pressed by the second member, the height to which the third member protrudes from the rear end surface in a first direction parallel to the central axis is defined as the first height, when the third member is located in the second region and the third member is not pressed by the first member, the height to which the third member protrudes from the front end surface in a first direction is defined as the second height, and the sum of the first height and the second height is defined as the exposed height, wherein the exposed height on the second side is greater than the exposed height on the first side.

2. The holder according to claim 1, wherein at least one of the first region and the second region is a groove into which a part of the third member fits, and the groove has a first groove portion located on the first side and a second groove portion located on the second side, and in the first direction, the second groove portion is shallower than the first groove portion.

3. The holder according to claim 1 or 2, wherein the third member has a first portion located on the first side and a second portion located on the second side, and in the first direction, the thickness of the second portion is greater than the thickness of the first portion.

4. The holder according to any one of claims 1 to 3, wherein the material of the first member and the material of the second member are both insulating metals.

5. A cutting tool comprising a holder according to any one of claims 1 to 4, and a cutting insert mounted on the holder.

6. A method for manufacturing a machined workpiece, comprising the steps of: rotating a workpiece; bringing a cutting tool described in claim 5 into contact with the rotating workpiece; and separating the cutting tool from the workpiece.

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