Holder, cutting tool, and method for producing machined workpiece

Abstract

The present invention achieves high work efficiency. When a rear part is pushed upward by a pin, a front part approaches a lower jaw, and a spacing between a region on the front-end side of an upper end part and the rear part is larger than a spacing between a region on the rear-end side of the upper end part and the rear part.

Description

Holder, Cutting Tool, and Method for Manufacturing Cut Product

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

[0002] The holder, cutting tool, and method for manufacturing a cut product are used for cutting a work material. Examples of the cutting process may include turning, milling, and the like. Examples of the turning process may include internal diameter machining, external diameter machining, grooving, parting-off, and the like.

[0003] As a cutting tool used when cutting a work material, for example, the cutting tool described in Patent Document 1 may be mentioned. In the insert clamping device (cutting tool) described in Patent Document 1, a clamping piece (upper jaw), on which an upward force point acts on one side and a downward action point acts on the other side across a fulcrum, is integrally provided on a holder (lower jaw). This makes it possible to elastically clamp an insert between the downward action point of the clamping piece and the holder.

[0004] Japanese Patent Application Laid-Open No. 11-138309

[0005] In one non-limiting embodiment of the present disclosure, the holder is a holder having a shape extending from a front end toward a rear end, and includes: a main body having a pocket located on the front end side to which a cutting insert can be attached, and an upper jaw and a lower jaw located with the pocket interposed therebetween; and a clamping mechanism capable of restraining the cutting insert by elastically deforming the upper jaw.

[0006] The upper jaw includes: a connection portion connected to the lower jaw; a front portion located closer to the front end than the connection portion and facing the lower jaw with the pocket interposed therebetween; and a rear portion located closer to the rear end than the connection portion. The clamping mechanism has a pin that abuts against the rear portion and pushes the rear portion upward. When the rear portion is pushed upward by the pin, the front portion approaches the lower jaw. The pin has an upper end facing the rear portion. A distance between a region of the upper end located on the front end side and the rear portion is larger than a distance between a region of the upper end located on the rear end side and the rear portion.

[0007] This is a perspective view showing the configuration of the main part of the holder according to Embodiment 1 of this disclosure. This is a rear view showing the configuration of the holder according to Embodiment 1 of this disclosure. This is a top view showing the configuration of the holder according to Embodiment 1 of this disclosure. This is a front view showing the configuration of the holder according to Embodiment 1 of this disclosure. This is a bottom view showing the configuration of the holder according to Embodiment 1 of this disclosure. This is a cross-sectional view taken along line VI-VI in Figure 5. This is a cross-sectional view taken along line VII-VII in Figures 5 and 8. This is a top view showing the configuration of the main part of the holder according to Embodiment 1 of this disclosure. (a) to (d) are front views showing specific examples of pins, respectively. This is a front view of a screw. This is a cross-sectional view of the holder according to the first specific example of Embodiment 1 of this disclosure. This is an enlarged view of area XII in Figure 11. This is a cross-sectional view of the holder according to the second specific example of Embodiment 1 of this disclosure. This is an enlarged view of area XIV in Figure 13. This is a cross-sectional view showing the configuration of the main part of the holder according to Embodiment 2 of this disclosure. This is a cross-sectional view showing the configuration of the main part of another holder according to Embodiment 2 of this disclosure. This is a top view showing process D1 in the manufacturing method of a machined workpiece according to Embodiment 4 of this disclosure. This is a top view showing process D2 in the manufacturing method of a machined workpiece according to Embodiment 4 of this disclosure. This is a top view showing step D3 in the method for manufacturing a machined workpiece according to Embodiment 4 of the present disclosure.

[0008] 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.

[0009] [Embodiment 1] Figure 1 is a perspective view showing the configuration of the main part of the holder 101 according to Embodiment 1 of the present disclosure. Figure 2 is a rear view showing the configuration of the holder 101 according to Embodiment 1 of the present disclosure. Figure 3 is a top view showing the configuration of the holder 101 according to Embodiment 1 of the present disclosure. Figure 4 is a front view showing the configuration of the holder 101 according to Embodiment 1 of the present disclosure. Figure 5 is a bottom view showing the configuration of the holder 101 according to Embodiment 1 of the present disclosure.

[0010] Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5. Figure 7 is a cross-sectional view taken along line VII-VII of Figure 5 and Figure 8, which will be described later. Figure 8 is a top view showing the configuration of the main part of the holder 101 according to Embodiment 1 of the present disclosure. Figures 9(a) to 9(d) are front views showing specific examples of the pin 11, respectively. Figure 10 is a front view of the screw 24. In the embodiment shown in Figure 6, the pin 11 in the manner shown in Figure 9(a) is used.

[0011] Figure 11 is a cross-sectional view of a holder 101 according to a first specific example of Embodiment 1 of the present disclosure. Figure 12 is an enlarged view of area XII of Figure 11. Figure 13 is a cross-sectional view of a holder 101 according to a second specific example of Embodiment 1 of the present disclosure. Figure 14 is an enlarged view of area XIV of Figure 13. In the holder 101 according to the first specific example, the pin 11 in the manner shown in Figure 9(b) is used. In the holder 101 according to the second specific example, the pin 11 in the manner shown in Figure 9(c) is used.

[0012] The holder 101 may have a shape that extends from the front end 1 to the rear end 2. An example of such a shape is a rod shape. The holder 101 may have a main body 3 and a clamping mechanism 4.

[0013] The main body 3 may have a pocket 5, an upper jaw 6, and a lower jaw 7. The pocket 5 is located on the side of the anterior end 1 and is capable of mounting a cutting insert 102. The upper jaw 6 and lower jaw 7 are positioned with the pocket 5 in between.

[0014] Examples of the shape of the main body 3 include a cylindrical shape and a polygonal prism shape. Examples of the material of the main body 3 include steel, cast iron, and aluminum alloy.

[0015] The clamping mechanism 4 may also be capable of restraining the cutting insert 102 by elastically deforming the upper jaw 6.

[0016] The maxilla 6 may have a connecting portion 8, an anterior portion 9, and a posterior portion 10. The connecting portion 8 is connected to the mandible 7. The anterior portion 9 is located on the anterior end 1 side of the connecting portion 8 and faces the mandible 7 with a pocket 5 in between. The posterior portion 10 is located on the posterior end 2 side of the connecting portion 8.

[0017] The clamping mechanism 4 may have a pin 11. The pin 11 contacts the rear portion 10 and pushes the rear portion 10 upward. In the holder 101, the anterior portion 9 may move closer to the mandible 7 as the rear portion 10 is pushed upward by the pin 11.

[0018] The pin 11 may have an upper end portion 12 facing the rear portion 10. The distance 14 between the region 13 of the upper end portion 12 located on the front end 1 side and the rear portion 10 may be greater than the distance 16 between the region 15 of the upper end portion 12 located on the rear end 2 side and the rear portion 10.

[0019] When the cutting insert 102 attached to the pocket 5 is restrained, the fulcrum, effort point, and point of application are the fulcrum 51, effort point 52, and point of application 53, respectively. When the spacing 14 is larger than the spacing 16, the rear portion 10 and region 13 do not come into contact, so the effort point 52 is formed at the contact point between the rear portion 10 and region 15. On the other hand, when the rear portion 10 and region 13 come into contact, the effort point 54 is formed at the contact point between the rear portion 10 and the upper portion 12 (region 13 and region 15), and is located closer to the front end 1 than the effort point 52, due to the influence of the contact between the rear portion 10 and region 13. In other words, it can be seen that the spacing between the fulcrum 51 and the effort point is larger when the spacing 14 is larger than the spacing 16.

[0020] According to the holder 101, the distance between the fulcrum 51 and the point of force application 52 is larger than the distance between the fulcrum 51 and the point of force application 54, so less force is required to elastically deform the upper jaw 6. Therefore, high work efficiency can be achieved.

[0021] As shown in the specific example in Figure 9(b), the upper end portion 12 has a stepped portion 17, and the distance 19 between the region 18 located on the front end 1 side of the stepped portion 17 and the rear portion 10 may be greater than the distance 21 between the region 20 located on the rear end 2 side of the stepped portion 17 and the rear portion 10. This makes it possible to realize a configuration in which the distance 14 is greater than the distance 16.

[0022] As shown in the specific examples in Figures 9(c) and 9(d), the upper end portion 12 may have an inclined portion 22 located on the side of the front end portion 1 that moves away from the rear portion 10 as it approaches the front end portion 1. This makes it possible to achieve a configuration in which the spacing 14 is larger than the spacing 16.

[0023] The inclined portion 22 may have a straight shape in cross-sectional view, as shown in the specific example in Figure 9(c). The inclined portion 22 may also have an upwardly convex curved shape in cross-sectional view, as shown in the specific example in Figure 9(d). This allows for chamfering between the region 15 and the inclined portion 22, thereby reducing the load on the rear portion 10 caused by pressing the pin 11 against it.

[0024] The pin 11 further has a lower end portion 23, and the clamping mechanism 4 further has a screw 24 that contacts the lower end portion 23, and the pin 11 may be pushed upward by tightening the screw 24. This allows the screw 24 to be operated from the side of the lateral surface 27, which will be described later, and the cutting insert 102 can be easily attached to and detached from the holder 101 in a machine tool to which the cutting tool 201 is attached, such as an automatic lathe. In other words, the operability related to attaching and detaching the cutting insert 102 can be improved.

[0025] The main body 3 may have an upper surface 25, a lower surface 26, and a lateral surface 27. The upper surface 25 extends from the upper jaw 6 toward the rear end 2. The lower surface 26 extends from the lower jaw 7 toward the rear end 2. The lateral surface 27 is located between the upper surface 25 and the lower surface 26. The pin 11 is located closer to the lateral surface 27 than to the pocket 5, and when viewed from the side of the lateral surface 27, a part of the pin 11 may overlap with the pocket 5. This makes it possible to shorten the distance between the point of application 53 and the fulcrum 51. Therefore, it becomes possible to miniaturize the holder 101 while ensuring high work efficiency. In addition, since the lengths of the upper jaw 6 and lower jaw 7 in the direction from the front end 1 toward the rear end 2 can be shortened, the rigidity of the upper jaw 6 and lower jaw 7 is improved, and chatter vibration can be reduced.

[0026] The thickness W1 of the rear portion 10 in the vertical direction Y may be greater than the thickness W2 of the front portion 9 in the vertical direction Y. This allows the strength of the rear portion 10 to be increased in the area close to the point of force application 52. As a result, the force with which the pin 11 pushes the rear portion 10 upward is more easily transmitted to the front portion 9, and the front portion 9 can move closer to the mandible 7. In other words, the force that restrains the cutting insert 102 by the maxilla 6 is more easily improved.

[0027] [Embodiment 2] Figure 15 is a cross-sectional view showing the configuration of the main part of the holder 101 according to Embodiment 2 of the present disclosure. Figure 16 is a cross-sectional view showing the configuration of the main part of another holder 101 according to Embodiment 2 of the present disclosure. In this embodiment, the pin 11 in the form shown in Figure 9(a) is used.

[0028] The rear portion 10 may have a recess 56 in the portion facing region 13 that is recessed relative to the portion facing region 15. The recess 56 may have a stepped portion 57, as shown in Figure 15. The distance between the region of the pin 11 located on the front end 1 side of the stepped portion 57 and the rear portion 10 may be greater than the distance between the region of the pin 11 located on the rear end 2 side of the stepped portion 57 and the rear portion 10. The recess 56 may have an inclined portion 58, as shown in Figure 16. As a result, the distance between the pin 11 and the rear portion 10 may increase as it approaches the front end 1.

[0029] This makes it possible to achieve a configuration in which the spacing 14 is larger than the spacing 16. In a configuration in which the upper end portion 12 has a stepped portion 17, it may be necessary to position the pin 11 so that it does not rotate. Since the rear portion 10 has a recess 56, the need to position the pin 11 is reduced, and the configuration of the holder 101 can be simplified.

[0030] [Embodiment 3] The cutting tool 201 may include a holder 101 and a cutting insert 102 attached to a pocket 5 in the holder 101. For example, Figure 1 can be interpreted as a perspective view showing the configuration of the main part of the cutting tool 201 according to Embodiment 3 of the present disclosure.

[0031] Examples of materials for the cutting insert 102 include cemented carbide and cermet. However, the material of the cutting insert 102 is not limited to these.

[0032] 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.

[0033] 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).

[0034] [Embodiment 4] Figure 17 is a top view showing step D1 in the manufacturing method of a machined workpiece 401 according to Embodiment 4 of the present disclosure. Figure 18 is a top view showing step D2 in the manufacturing method of a machined workpiece 401 according to Embodiment 4 of the present disclosure. Figure 19 is a top view showing step D3 in the manufacturing method of a machined workpiece 401 according to Embodiment 4 of the present disclosure. The manufacturing method of a machined workpiece 401 may include steps D1 to D3.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] In the method for manufacturing the cut workpiece 401, a cutting tool 201 equipped with a holder 101 that achieves high work efficiency is used. Therefore, the method for manufacturing the cut workpiece 401 allows for the efficient production of the cut workpiece 401.

[0039] 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.

[0040] 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 gist of the present embodiment.

[0041] [Summary] A holder according to Embodiment 1 of the present disclosure is a holder having a shape extending from a front end to a rear end, and comprising a body having a pocket located on the front end side to which a cutting insert can be attached, and an upper jaw and a lower jaw located between the pocket, and a clamping mechanism capable of restraining the cutting insert by elastically deforming the upper jaw, wherein the upper jaw has a connecting portion connected to the lower jaw, a front portion located on the front end side of the connecting portion and facing the lower jaw with the pocket between them, and a rear portion located on the rear end side of the connecting portion, the clamping mechanism having a pin that abuts the rear portion and pushes the rear portion upward, the front portion approaching the lower jaw as the rear portion is pushed upward by the pin, the pin has an upper end facing the rear portion, the distance between the region of the upper end located on the front end side and the rear portion is greater than the distance between the region of the upper end located on the rear end side and the rear portion.

[0042] According to aspect 2 of the present disclosure, in the holder according to aspect 1, the upper end portion has a stepped portion, and a distance between a region located closer to the front end side than the stepped portion and the rear portion is larger than a distance between a region located closer to the rear end side than the stepped portion and the rear portion.

[0043] According to aspect 3 of the present disclosure, in the holder according to aspect 1, the upper end portion has an inclined portion located on the front end side, wherein the inclined portion becomes further away from the rear portion as approaching the front end.

[0044] According to aspect 4 of the present disclosure, in the holder according to aspect 3, the inclined portion has an upwardly convex curved shape in a cross-sectional view.

[0045] According to aspect 5 of the present disclosure, in the holder according to any one of aspects 1 to 4, the pin further has a lower end portion, the clamp mechanism further has a screw abutting against the lower end portion, and the pin is pushed upward by tightening the screw.

[0046] According to aspect 6 of the present disclosure, in the holder according to any one of aspects 1 to 5, the main body has an upper surface extending from the upper jaw toward the rear end, a lower surface extending from the lower jaw toward the rear end, and a lateral side surface located between the upper surface and the lower surface, the pin is located closer to the lateral side surface than the pocket, and when viewed in plane from the lateral side surface side, a part of the pin overlaps with the pocket.

[0047] According to aspect 7 of the present disclosure, in the holder according to any one of aspects 1 to 6, a thickness of the rear portion in the vertical direction is larger than a thickness of the front portion in the vertical direction.

[0048] According to aspect 8 of the present disclosure, in the cutting tool according to any one of aspects 1 to 7, the cutting tool includes the holder and a cutting insert attached to the pocket of the holder.

[0049] According to aspect 9 of the present disclosure, in the method for manufacturing a cut workpiece according to aspect 8, the method includes 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.

[0050] The inventions described in this disclosure have been explained above based on the drawings and embodiments. However, the inventions described in this disclosure are not limited to the embodiments described above. That is, the inventions described in this disclosure can be modified in various ways within the scope shown in this disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the inventions described in this disclosure. In other words, it should be noted that it is easy for those skilled in the art to make various modifications or alterations based on this disclosure. Furthermore, it should be noted that these modifications or alterations are included in the scope of this disclosure.

[0051] 1 Front end 2 Rear end 3 Main body 4 Clamping mechanism 5 Pocket 6 Upper jaw 7 Lower jaw 8 Connecting part 9 Front part 10 Rear part 11 Pin 12 Upper end 13 Area of ​​the upper end located on the front end side 14 Distance between the area of ​​the upper end located on the front end side and the rear part 15 Area of ​​the upper end located on the rear end side 16 Distance between the area of ​​the upper end located on the rear end side and the rear part 17 Stepped section 18 Area located on the front end side of the stepped section 19 Distance between the area located on the front end side of the stepped section and the rear part 20 Area located on the rear end side of the stepped section 21 Distance between the area located on the rear end side of the stepped section and the rear part 22 Inclined section 23 Lower end 24 Screw 25 Top surface 26 Bottom surface 27 Side view 101 Holder 102 Cutting insert 201 Cutting tool 301 Workpiece 401 Cutting workpiece W1 Thickness of the rear part in the vertical direction W2 Thickness of the front part in the vertical direction Y Vertical direction

Claims

1. A holder having a shape extending from a front end to a rear end, comprising: a body having a pocket located on the front end side into which a cutting insert can be attached; an upper jaw and a lower jaw located between the pocket; and a clamping mechanism capable of restraining the cutting insert by elastically deforming the upper jaw, wherein the upper jaw has a connecting portion connected to the lower jaw; a front portion located on the front end side of the connecting portion and facing the lower jaw with the pocket between them; and a rear portion located on the rear end side of the connecting portion; the clamping mechanism has a pin that abuts the rear portion and pushes the rear portion upward, the front portion approaching the lower jaw as the rear portion is pushed upward by the pin; the pin has an upper end facing the rear portion; and the distance between the region of the upper end located on the front end side and the rear portion is greater than the distance between the region of the upper end located on the rear end side and the rear portion.

2. The holder according to claim 1, wherein the upper end portion has a stepped portion, and the distance between the region located on the front end side of the stepped portion and the rear portion is greater than the distance between the region located on the rear end side of the stepped portion and the rear portion.

3. The holder according to claim 1, wherein the upper end portion has an inclined portion located on the side of the front end portion and moving away from the rear portion as it approaches the front end portion.

4. The holder according to claim 3, wherein the inclined portion has an upwardly convex curved shape in cross-sectional view.

5. The holder according to any one of claims 1 to 4, wherein the pin further has a lower end, the clamping mechanism further has a screw that contacts the lower end, and the pin is pushed upward by tightening the screw.

6. The holder according to any one of claims 1 to 5, wherein the main body has an upper surface extending from the upper jaw toward the rear end, a lower surface extending from the lower jaw toward the rear end, and a lateral surface located between the upper surface and the lower surface, the pin is located closer to the lateral surface than to the pocket, and when viewed planar from the side of the lateral surface, a portion of the pin overlaps with the pocket.

7. The holder according to any one of claims 1 to 6, wherein the thickness of the rear portion in the vertical direction is greater than the thickness of the front portion in the vertical direction.

8. A cutting tool comprising a holder according to any one of claims 1 to 7, and a cutting insert attached to the pocket in the holder.

9. A method for manufacturing a machined workpiece, comprising the steps of: rotating a workpiece; bringing a cutting tool described in claim 8 into contact with the rotating workpiece; and removing the cutting tool from the workpiece.

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