Holder, cutting tool, and manufacturing method of cutting object

Abstract

To provide a holder which achieves high durability.SOLUTION: A vibration control member of a holder has a shaft member, a cylindrical weight into which the shaft member is inserted, and a first lid and a second lid to which the shaft member and the weight are fixed. The weight has: a cylindrical first weight member into which the shaft member is inserted; and a cylindrical second weight member into which the shaft member and the first weight member are inserted; and an attenuation body which is located between the first weight member and the second weight member and extends from a tip side to a rear end side.SELECTED DRAWING: Figure 7

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] As shown in Patent Document 1, various holders equipped with vibration-proof mechanisms have been proposed in the past. Patent Document 1 discloses a holder having a main body with a cylindrical hollow portion, and a coolant pipe, an axial member, and a tubular member arranged in the hollow portion. The axial member and the tubular member function as vibration damping members. The coolant pipe, the axial member, and the tubular member are arranged coaxially, and each member is fixed by an elastic seal material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-007677 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the holder described in Patent Document 1, the shaft member and the tubular member are fixed only by the elastic seal material. Therefore, the elastic seal material is subjected to a large load, and the elastic seal material is easily deteriorated, so there is a risk that the durability of the holder will decrease. One of the objectives of the present disclosure is to provide a holder with high durability. [Means for solving the problem]

[0005] A non-limiting example of a holder of the present disclosure includes a main body having a shape extending from a tip to a rear end along a central axis, the main body having a pocket located on the tip side into which a cutting insert can be attached, and a cavity located closer to the rear end than the pocket and extending along the central axis, and a vibration-damping member located inside the cavity, the vibration-damping member having an axial member extending along the central axis, a cylindrical weight extending along the central axis and into which the axial member is inserted, a first lid to which the axial member and the weight are fixed on the tip side, and a second lid to which the axial member and the weight are fixed on the rear end side, the weight having a cylindrical first weight member into which the axial member is inserted, a cylindrical second weight member into which the axial member and the first weight member are inserted, and a damping body located between the first weight member and the second weight member and extending from the tip side to the rear end side. Effect of the Invention

[0006] The non-limiting example holder of the present disclosure is highly durable. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a cutting tool according to a non-limiting embodiment of the present disclosure. [Diagram 2] FIG. 2 is a side view of the cutting tool shown in FIG. [Diagram 3] FIG. 2 is a perspective view of a holder in the cutting tool shown in FIG. [Figure 4] FIG. 4 is a side view of the holder shown in FIG. [Diagram 5] 5 is a V-sectional view of the holder shown in FIG. 4. [Figure 6] 6 is an enlarged cross-sectional view of a region VI in the holder shown in FIG. 5. [Figure 7] 7 is an enlarged cross-sectional view of a region VII in the holder shown in FIG. 6. [Figure 8] 7 is a cross-sectional view corresponding to FIG. 6 of a holder in a non-limiting embodiment of the present disclosure. [Figure 9]9 is an enlarged cross-sectional view of a region IX in the holder shown in FIG. 8. [Figure 10] 4 is a perspective view of a vibration-isolating member in the holder shown in FIG. 3. [Figure 11] 11 is a partial cross-sectional view of the vibration-proof member shown in FIG. 10. [Figure 12] FIG. 11 is an exploded perspective view of the vibration-proof member shown in FIG. [Figure 13] 11 is a front view of the vibration-proof member shown in FIG. 10 as viewed from the tip side. [Figure 14] 14 is a side view of the vibration-proof member shown in FIG. 13, viewed from the A1 direction. [Figure 15] 14 is a cross-sectional view of the vibration-proof member shown in FIG. 13 taken along the line XIV. [Figure 16] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. [Figure 17] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. [Figure 18] 1 is a schematic diagram showing a step in a method for manufacturing a machined product according to a non-limiting embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] <Holder> Hereinafter, the holder 1 of a number of non-limiting embodiments of the present disclosure will be described in detail with reference to the drawings. However, for the sake of convenience, each of the drawings referred to below shows only the main members necessary for explaining each embodiment in a simplified manner. Therefore, the holder 1 may include any component member not shown in each of the drawings referred to. Furthermore, the dimensions of the members in each drawing do not faithfully represent the dimensions and dimensional ratios of the actual components. These points are the same for the cutting tool 101 and the manufacturing method of the machined product described later.

[0009] A cutting tool 101 is used in cutting a workpiece to manufacture a machined product. FIG. 1 is a perspective view showing the cutting tool 101 according to a non-limiting embodiment of the present disclosure. FIG. 2 is a side view of the cutting tool 101 shown in FIG. 1. As a non-limiting example shown in FIGS. 1 and 2, the cutting tool 101 generally has a cutting insert 103 (hereinafter, also simply referred to as "insert 103") and a holder 1. The insert 103 can have a function of contacting the workpiece to cut the workpiece. The holder 1 can be used to hold the insert 103.

[0010] Fig. 3 is a perspective view of the holder 1 in the cutting tool 101 shown in Fig. 1. Fig. 4 is a side view of the holder 1 shown in Fig. 3. Fig. 5 is a V-sectional view of the holder 1 shown in Fig. 4. The holder 1 may have a main body 3 and a vibration-proof member 5.

[0011] The main body 3 may have a shape extending from a front end 3a to a rear end 3b along the central axis O1, as in a non-limiting example shown in Figs. 3 to 5. An example of such a shape is a rod shape. Here, the rod shape means that the length in the direction along the central axis O1 is greater than the length in the direction perpendicular to the central axis O1. Therefore, the main body 3 may have, for example, a cylindrical shape or a polygonal prism shape. The main body 3 in the non-limiting example shown in Figs. 3 to 5 has a cylindrical shape. Examples of materials for the main body 3 include steel, cast iron, and aluminum alloy.

[0012] The size of the main body 3 may be set appropriately depending on the size of the workpiece. For example, the length of the main body 3 in the direction along the central axis O1 may be set to about 60 mm or more and 3500 mm or less. Also, the width (diameter) of the main body 3 in the direction perpendicular to the central axis O1 may be set to about 6 mm or more and 250 mm or less.

[0013] Fig. 6 is an enlarged cross-sectional view of region VI in the holder 1 shown in Fig. 5. The main body 3 may have a pocket 7 and a cavity 9, as in the non-limiting example shown in Figs. 3 to 6. The pocket 7 may be located on the side of the tip 3a in the main body 3. The pocket 7 is a portion of the holder 1 to which the insert 103 is attached, and the insert 103 can be attached. Before the insert 103 is attached, the pocket 7 may be a recessed portion on the side of the tip 3a in the main body 3.

[0014] The number of pockets 7 may be one or more. When there are more than one pockets 7, the number may be 2 to 10. In a non-limiting example shown in FIGS. 3 to 6, the main body 3 has one pocket 7.

[0015] The cavity 9 may extend along the central axis O1 in the main body 3. The cavity 9 is located closer to the rear end 3b than the pocket 7, and does not need to be located locally at the end of the main body 3 on the side of the rear end 3b. As a non-limiting example shown in FIG. 5, the cavity 9 may be located up to the tip 3a side of the center of the main body 3 in the direction along the central axis O1. The cavity 9 can be used as a space to accommodate the vibration-proof member 5. The cavity 9 may be, for example, cylindrical or polygonal tubular.

[0016] <Vibration-proofing materials> Fig. 10 is a perspective view of the vibration-proof member 5 in the holder 1 shown in Fig. 3. Fig. 11 is a partial cross-sectional view of the vibration-proof member 5 shown in Fig. 10. Fig. 12 is an exploded perspective view of the vibration-proof member 5 shown in Fig. 10. Fig. 13 is a front view of the vibration-proof member 5 shown in Fig. 10, seen from the tip 3a side. Fig. 14 is a side view of the vibration-proof member 5 shown in Fig. 13, seen from the A1 direction. Fig. 15 is a cross-sectional view taken along line XIV of the vibration-proof member 5 shown in Fig. 13.

[0017] The vibration-proof member 5 may be located inside the cavity 9. The vibration-proof member 5 is a member extending along the central axis O1, and may be cylindrical, as in a non-limiting example shown in Figs. 10 and 11. In cutting a workpiece to manufacture a machined product, the holder 1 vibrates (chatter vibration) due to the cutting load. The vibration-proof member 5 is a member for reducing this chatter vibration. By reducing the chatter vibration by the vibration-proof member 5, the smoothness of the machined surface of the workpiece is improved, and high machining accuracy can be achieved.

[0018] The size of the vibration-isolating member 5 is not limited to a specific value. For example, the length of the vibration-isolating member 5 in the direction along the central axis O1 may be set to about 20 mm or more and 200 mm or less. Also, the width (diameter) of the main body 3 in the direction perpendicular to the central axis O1 may be set to about 3 mm or more and 200 mm or less.

[0019] The vibration-proof member 5 may have a shaft member 11, a weight 13, a first lid 15, and a second lid 17. The shaft member 11 is a member extending along a central axis O1. The shaft member 11 may have a simple rod shape, and may have a first through hole 19 extending along the central axis O1, as in a non-limiting example shown in FIG. 11. The length of the shaft member 11 in the direction along the central axis O1 may be set to about 20 mm or more and 200 mm or less, similar to the length of the vibration-proof member 5. The shaft member 11 may include a pipe through which a coolant flows.

[0020] A coolant that can be used for cooling the insert 103 can be passed through the first through hole 19. The first through hole 19 has a circular cross section perpendicular to the central axis O1, but the cross section of the first through hole 19 may have an elliptical or polygonal shape, for example. The diameter of the first through hole 19 may be set to, for example, 1 mm or more and 10 mm or less.

[0021] The weight 13 may be cylindrical and extend along the central axis O1. The shaft member 11 may be inserted into the cylindrical weight 13. The weight 13 is a core member of the vibration-proofing function of the vibration-proofing member 5, and is capable of vibrating within the cavity 9. When the holder 1 vibrates due to the cutting load, the weight 13 vibrates in response to the chatter vibrations that occur during the cutting process, and energy caused by the chatter vibrations in the main body 3 may be transmitted to the weight 13. Furthermore, the weight 13 vibrates so as to cancel out the chatter vibrations of the main body 3, thereby further reducing the chatter vibrations.

[0022] Specifically, there are cases where the vibration of the holder 1 can be reduced by the vibration of the main body 3 constituting the holder 1 canceling out the vibration of the weight 13 in the vibration-damping member 5 constituting the holder 1, and there are also cases where the vibration of the holder 1 can be reduced by the vibration energy transmitted from the main body 3 to the weight 13 being converted into thermal energy or sound energy.

[0023] In a cross section perpendicular to the central axis O1, the shaft member 11 and the weight 13 may be located on concentric circles. In this case, the center of the concentric circles may coincide with the central axis O1.

[0024] The first lid 15 may be a plate-shaped member located on the side of the tip 3a of the vibration-proof member 5, and the shaft member 11 and the weight 13 may be fixed thereto. As shown in a non-limiting example in FIG. 11, the first lid 15 may have a second through hole 21 extending along the central axis O1. The shaft member 11 may be inserted into the second through hole 21. The shaft member 11 may be fixed to the first lid 15 by the inner circumferential surface of the second through hole 21 abutting against the outer circumferential surface of the shaft member 11. Also, as shown in a non-limiting example in FIG. 11, an end face of the first lid 15 on the side of the rear end 3b may face the weight 13.

[0025] At this time, the weight 13 is located away from the first lid 15, and the front elastic member 23 may be located between the weight 13 and the first lid 15. The front elastic member 23 in a non-limiting example shown in FIG. 11 is annular. The front elastic member 23 is a member that supports the vibration of the weight 13 in the cavity 9. Therefore, the front elastic member 23 may abut against the weight 13 and the first lid 15. The front elastic member 23 deforms in response to the vibration of the first lid 15 and the weight 13, so that chatter vibration of the main body 3 is easily propagated to the weight 13 via the front elastic member 23.

[0026] The front elastic member 23 is a member that is more easily elastically deformed than the weight 13 and the first lid 15. When the chatter vibration of the main body 3 is transmitted to the weight 13 via the front elastic member 23, the front elastic member 23 is a member that is more easily elastically deformed than the first lid 15 and the weight 13, so that a time lag in the phase of the vibration is likely to occur in the front elastic member 23, and the vibration mode can be converted. Therefore, the weight 13 is likely to vibrate so as to cancel out the chatter vibration of the main body 3.

[0027] The front elastic member 23 being more easily elastically deformed than the first lid 15 and the weight 13 means that the front elastic member 23 has a structure or material that is relatively more easily elastically deformed. Specifically, the front elastic member 23 may be, for example, an O-ring or a spring. The material of the O-ring may be, for example, rubber or resin. The rubber may be, for example, NBR (acrylonitrile butadiene rubber) or AU (polyester urethane rubber). The material of the spring may be, for example, metal such as steel or cast iron.

[0028] The second lid 17 may be a plate-shaped member located on the rear end 3b side of the vibration-proof member 5, and may have the shaft member 11 and the weight 13 fixed thereto, as in the first lid 15. As shown in a non-limiting example in FIG. 11, the second lid 17 may have a third through hole 25 extending along the central axis O1. The shaft member 11 may be inserted into the third through hole 25. The shaft member 11 may be fixed to the second lid 17 by the inner circumferential surface of the third through hole 25 coming into contact with the outer circumferential surface of the shaft member 11. Also, as shown in a non-limiting example in FIG. 11, the end face of the second lid 17 on the tip end 3a side may face the weight 13.

[0029] At this time, the weight 13 is located away from the second lid 17, and the rear elastic member 27 may be located between the weight 13 and the second lid 17. The rear elastic member 27 in a non-limiting example shown in FIG. 12 is annular. The rear elastic member 27 is a member that supports the vibration of the weight 13 in the cavity 9, similar to the front elastic member 23. Therefore, the rear elastic member 27 may abut against the weight 13 and the second lid 17. The rear elastic member 27 deforms in response to the vibration of the second lid 17 and the weight 13, so that chatter vibration of the main body 3 is easily propagated to the weight 13 via the rear elastic member 27.

[0030] The rear elastic member 27 is a member that is more easily elastically deformed than the weight 13 and the second lid 17. When the chatter vibration of the main body 3 is transmitted to the weight 13 via the second elastic member 37, the rear elastic member 27 is a member that is more easily elastically deformed than the second lid 17 and the weight 13, so that a time lag in the phase of the vibration is likely to occur in the rear elastic member 27, and the vibration mode can be converted. Therefore, the weight 13 is likely to vibrate so as to cancel out the chatter vibration of the main body 3.

[0031] The rear elastic member 27 being more easily elastically deformed than the second cover 17 and the weight 13 means that the rear elastic member 27 has a structure or material that is relatively more easily elastically deformed. Specifically, the rear elastic member 27 may be, for example, an O-ring or a spring. The O-ring may be made of rubber or resin. The rubber may be, for example, NBR (acrylonitrile butadiene rubber) or AU (polyester urethane rubber). The spring may be made of metal such as steel or cast iron.

[0032] Examples of the material of the first lid 15 and the second lid 17 include metal and resin. Examples of the metal include copper, steel, stainless steel, and aluminum. Examples of the resin include polyethylene, polypropylene, polystyrene, and polyvinyl chloride. The materials of the first lid 15 and the second lid 17 may be the same or different from each other.

[0033] <weight> As a non-limiting example shown in FIG. 12, the weight 13 may include a first weight member 29, a second weight member 31, and a damping body 33.

[0034] The first weight member 29 may be cylindrical and extending along the central axis O1. The shaft member 11 may be inserted into the cylindrical first weight member 29. Similarly to the first weight member 29, the second weight member 31 may be cylindrical and extending along the central axis O1. The shaft member 11 and the first weight member 29 may be inserted into the cylindrical second weight member 31. In this case, the shaft member 11, the first weight member 29, and the second weight member 31 may be positioned on concentric circles. In this case, the center of the concentric circles may coincide with the central axis O1.

[0035] When the holder 1 vibrates due to the cutting load, the first weight member 29 and the second weight member 31 vibrate in response to the chatter vibrations that occur during the cutting process, thereby enabling the first weight member 29 and the second weight member 31 to function as members that receive the energy of the chatter vibrations of the main body 3, and the energy caused by the chatter vibrations in the main body 3 can be absorbed by the first weight member 29.

[0036] Examples of materials for the first weight member 29 and the second weight member 31 include, but are not limited to, high-speed steel, tungsten (W), cemented carbide, and cermet. The specific gravity of the material for the first weight member 29 and the second weight member 31 may be greater than the specific gravity of the material for the main body 3.

[0037] The compositions of cemented carbide may include, for example, 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. WC-TiC-Co is WC-Co with the addition of titanium carbide (TiC). WC-TiC-TaC-Co is WC-TiC-Co with the addition of tantalum carbide (TaC).

[0038] A cermet is a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be one whose main component is a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN).

[0039] The first weight member 29 and the second weight member 31 may be made of the same material, or may be made of different materials.

[0040] The attenuation body 33 may be located between the first weight member 29 and the second weight member 31. The attenuation body 33 is a member that supports the vibration of the weight 13 in the cavity 9. Specifically, the attenuation body 33 has a function of transmitting vibration in one of the first weight member 29 and the second weight member 31 to the other of the first weight member 29 and the second weight member 31. For this reason, the attenuation body 33 may be in contact with the first weight member 29 and the second weight member 31.

[0041] Fig. 7 is an enlarged cross-sectional view of region VII in holder 1 shown in Fig. 6. As in the example shown in Fig. 7, damping body 33 may be in contact with an outer circumferential surface of first weight member 29 and an inner circumferential surface of second weight member 31. As damping body 33 deforms in response to vibration of main body 3 and weight 13, chatter vibration of main body 3 is easily propagated from first weight member 29 to second weight member 31 via damping body 33.

[0042] If the damping body 33 is an O-ring like the front elastic member 23 and the rear elastic member 27, for example, the load on the damping body 33 is large, and the damping body 33 may be easily deteriorated. In particular, the durability of the damping body 33 is more likely to decrease than that of the front elastic member 23 and the rear elastic member 27. This is because the gap between the cylindrical first weight member 29 and second weight member 31 is very narrow and the space is limited.

[0043] In order to increase the durability of the damping body 33, it is necessary to increase the gap between the cylindrical first weight member 29 and second weight member 31. In such a case, however, the first weight member 29 and second weight member 31 must be made smaller, making it difficult to fully obtain the vibration-damping effect of the vibration-damping member 5.

[0044] However, when the damping body 33 extends from the tip end 3a to the rear end 3b, as in the non-limiting example shown in Figure 6, the load applied to the damping body 33 can be distributed over a wide area, thereby improving the durability of the damping body 33.

[0045] The attenuation body 33 extending from the tip 3a side to the rear end 3b side does not necessarily mean that the attenuation body 33 is located over the entire area from the end of the tip 3a side to the end of the rear end 3b side in the space between the first weight member 29 and the second weight member 31. It is sufficient that the space between the first weight member 29 and the second weight member 31 is divided into three equal parts in the direction along the central axis O1, and the attenuation body 33 is located over at least a part of the space located on the tip 3a side to at least a part of the space located on the rear end 3b side among these three spaces.

[0046] The damping body 33 may be a solid or a liquid. When the damping body 33 is a solid, the damping body 33 is a member that is more easily elastically deformed than the first weight member 29 and the second weight member 31. When the damping body 33 is an elastic member, the damping body 33 has a structure or material that is relatively easily elastically deformed, and may be made of the same material as the front elastic member 23 and the rear elastic member 27.

[0047] When the damping body 33 is a liquid, the damping body 33 may be sealed in the space between the first weight member 29 and the second weight member 31. The damping body 33, which is a liquid, may be made of, for example, a water-insoluble oil agent or a water-soluble oil agent. Examples of the water-insoluble oil agent include oil-based, inactive extreme pressure, and active extreme pressure cutting oils. Examples of the water-soluble oil agent include emulsions, solubles, and solutions.

[0048] In a cross section perpendicular to the central axis O1, the first weight member 29, the second weight member 31, and the damping body 33 may be positioned on a concentric circle. In this case, the center of the concentric circle may coincide with the central axis O1.

[0049] In addition to the damping body 33, a first elastic member 35 and a second elastic member 37 may be further positioned between the first weight member 29 and the second weight member 31 in the weight 13. In other words, the weight 13 may further have the first elastic member 35 and the second elastic member 37. The first elastic member 35 may be annular and positioned between the first weight member 29 and the second weight member 31 on the tip end 3a side of the damping body 33. The second elastic member 37 may be annular and positioned between the first weight member 29 and the second weight member 31 on the rear end 3b side of the damping body 33.

[0050] When the damping body 33 is a solid elastic member as described above, the damping body 33 can be regarded as the third elastic member 39. In this case, the third elastic member 39 may be cylindrical. In this case, the damping body 33 (third elastic member 39) can stably absorb vibrations of the main body 3 in various directions perpendicular to the central axis O1.

[0051] In this case, the elastic modulus of the third elastic member 39 may be smaller than that of the first elastic member 35 and smaller than that of the second elastic member 37. The third elastic member 39, which has a relatively small elastic modulus, can transmit vibration energy between the first weight member 29 and the second weight member 31. In addition, a time lag in the phase of vibration is more likely to occur in the third elastic member 39, and conversion of the vibration mode can be stably performed. Furthermore, the first elastic member 35 and the second elastic member 37, which have a relatively large elastic modulus, can easily maintain the relative positional relationship between the first weight member 29 and the second weight member 31.

[0052] The elastic modulus of each member including the third elastic member 39 may be measured by using, for example, a well-known nanoindentation method. The measurement of the elastic modulus by the nanoindentation method may be performed based on ISO14577:2002.

[0053] Furthermore, when the damping body 33 is a liquid as described above, this liquid may be filled into the space surrounded by the first weight member 29, the second weight member 31, the first elastic member 35, and the second elastic member 37. When the liquid damping body 33 is filled into the above-mentioned space and the damping body 33 is sealed in this space, the damping body 33 can stably transmit vibration energy between the first weight member 29 and the second weight member 31.

[0054] FIG. 8 is a cross-sectional view of the holder 1 according to a non-limiting embodiment of the present disclosure, corresponding to FIG. 6. FIG. 9 is a cross-sectional view of an enlarged region IX in the holder 1 shown in FIG. 8. As in the non-limiting example shown in FIG. 8, the vibration-proof member 5 may have a fourth elastic member 41 as the front elastic member 23 located between the weight 13 and the first lid 15. The fourth elastic member 41 may be annular and may be sandwiched between the first weight member 29 and the first lid 15. In addition, the vibration-proof member 5 may have a fifth elastic member 43 as the rear elastic member 27 located between the weight 13 and the second lid 17. The fifth elastic member 43 may be annular and may be sandwiched between the first weight member 29 and the second lid 17.

[0055] In this case, since the vibration-proof member 5 is unlikely to come into contact with the inner peripheral surface of the cavity 9, the durability of the main body 3 is unlikely to decrease. In addition, since the durability of the main body 3 is unlikely to decrease, it is possible to reduce the thickness between the outer peripheral surface of the main body 3 and the inner peripheral surface of the cavity 9. This makes it possible to accommodate a smaller diameter for the holder 1, and also allows the cavity 9 to be enlarged so that the vibration-proof member 5 is large. In the latter case, the vibration-proofing effect provided by the vibration-proof member 5 can be improved.

[0056] At this time, a gap may be provided between the second weight member 31 and the first and second lids 15 and 17. In this case, the first weight member 29 and the second weight member 31 can function as a so-called series-type dynamic vibration absorber, improving the effect of vibration damping by the weight 13.

[0057] While the vibration-proof member 5 in the non-limiting example shown in FIG. 8 has the fourth elastic member 41 and the fifth elastic member 43, as in the non-limiting example shown in FIG. 7, the vibration-proof member 5 may have a sixth elastic member 45 and a seventh elastic member 47 instead of the fourth elastic member 41 and the fifth elastic member 43. Here, the sixth elastic member 45 may function as the front elastic member 23, and the seventh elastic member 47 may function as the rear elastic member 27. The sixth elastic member 45 may be annular and may be positioned between the second weight member 31 and the first lid 15. The seventh elastic member 47 may be annular and may be positioned between the second weight member 31 and the second lid 17.

[0058] In this case, the first weight member 29 is less likely to come into contact with the shaft member 11, improving the durability of the vibration-proof member 5. In addition, since the shaft member 11 is less likely to be displaced or damaged due to the first weight member 29 coming into contact with the shaft member 11, when the shaft member 11 has a first through hole 19, the coolant can flow stably through the first through hole 19.

[0059] At this time, a gap may be provided between the second weight member 31 and the first and second lids 15 and 17. In this case, the first weight member 29 and the second weight member 31 can function as a so-called series-type dynamic vibration absorber, improving the effect of vibration damping by the weight 13.

[0060] <Cutting tools> Next, a cutting tool 101 according to a non-limiting embodiment will be described in detail with reference to FIGS. 1 and 2, taking as an example a case where the cutting tool 101 includes the holder 1 described above.

[0061] 1 and 2, a cutting tool 101 in a non-limiting example may include a holder 1 and an insert 103 attached to the holder 1. The cutting tool 101 includes the holder 1 with high vibration-proofing performance, and therefore can exhibit excellent cutting performance.

[0062] 1 and 2, the insert 103 may have a polygonal plate shape. The shape of the insert 103 is not limited to a polygonal plate shape.

[0063] In a non-limiting example shown in FIG. 2, the insert 103 may have a cutting edge 105. The insert 103 may be positioned in the pocket 7 such that the cutting edge 105 protrudes laterally on the side of the tip 3a of the holder 1. The cutting tool 101 can perform cutting by bringing the cutting edge 105 into contact with a workpiece. As in a non-limiting example shown in FIG. 2, the cutting edge 105 may be located farthest from the central axis O1 on the side of the tip 3a of the body 3. When the cutting edge 105 protrudes laterally in this manner, only the vicinity of the cutting edge 105 can be brought into contact with the workpiece.

[0064] The insert 103 in the non-limiting example shown in Fig. 1 may further have a through hole 107. Moreover, the cutting tool 101 in the non-limiting example shown in Fig. 1 may further include a fixing member 109. The fixing member 109 may be a member for fixing the insert 103 to the holder 1. The fixing member 109 in the non-limiting example shown in Fig. 1 may be a screw 109. The fixing member 109 is not limited to the screw 109 and may be, for example, a clamp member or the like.

[0065] 1, the insert 103 may have a through hole 107 as described above, and the holder 1 may have a screw hole at a position corresponding to the through hole 107. The insert 103 can be fixed to the holder 1 by inserting a screw 109 into the through hole 107 of the insert 103 and fixing the screw 109 to the screw hole of the holder 1. In the non-limiting example shown in FIG. 1, the through hole 107 and the screw hole may extend in a direction perpendicular to the central axis O1.

[0066] The material of the insert 103 may include, for example, cemented carbide and cermet. The composition of the cemented carbide may include, for example, 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.

[0067] The cermet may also be a sintered composite material in which a ceramic component is combined with a metal. Specifically, the cermet may be one whose main component is a titanium compound such as titanium carbide (TiC) or titanium nitride (TiN).

[0068] 1 to 4, the cutting tool 101 includes the holder 1 of the example shown in the figure, but is not limited to this embodiment. For example, the cutting tool 101 may include the holder 1 of another embodiment.

[0069] <Method of manufacturing machined products> Next, a method for manufacturing a machined product 203 according to a non-limiting embodiment will be described in detail with reference to Figs. 16 to 18. Each of Figs. 16 to 18 is a schematic diagram showing one step in the method for manufacturing a machined product 203 according to a non-limiting embodiment of the present disclosure. In the example shown in Figs. 16 to 18, a cutting tool 101 including a holder 1 is used, but the present invention is not limited to this embodiment. For example, a cutting tool 101 including a holder 1 according to another embodiment may be used.

[0070] A method for manufacturing the machined product 203 according to a non-limiting embodiment may include the following steps (1) to (4).

[0071] (1) As a non-limiting example shown in FIG. 16, a workpiece 201 and a cutting tool 101 are prepared; (2) Rotating the workpiece 201; (3) As a non-limiting example shown in FIG. 17, a workpiece 201 and a cutting tool 101 are brought into contact with each other; (4) As a non-limiting example shown in FIG. 18, the workpiece 201 and the cutting tool 101 are separated from each other.

[0072] Specifically, examples of the material of the workpiece 201 prepared in step (1) include carbon steel, alloy steel, stainless steel, cast iron, non-ferrous metal, etc. In a non-limiting example shown in Fig. 16, the above-mentioned cutting tool 101 may be prepared in step (1).

[0073] In step (2), as a non-limiting example shown in FIG. 16, the workpiece 201 may be rotated about its rotation axis O2.

[0074] In the step (3), first, the cutting tool 101 may be moved in the direction of the arrow Y1 to bring the cutting tool 101 relatively close to the rotating workpiece 201. Next, the cutting tool 101 may be brought into contact with the rotating workpiece 201, as in a non-limiting example shown in Fig. 17. In the non-limiting example shown in Fig. 17, the cutting edge 105 of the cutting tool 101 may be brought into contact with the workpiece 201 to cut the workpiece 201.

[0075] In step (4), as a non-limiting example shown in FIG. 18, the cutting tool 101 may be moved in the direction of arrow Y2 to separate the cutting tool 101 from the workpiece 201, thereby obtaining a machined product 203.

[0076] According to the manufacturing method of the machined product 203 of the non-limiting embodiment, the cutting tool 101 having the holder 1 with high vibration-proofing performance is used, so that the workpiece 201 can be cut with excellent machining accuracy while reducing the risk of chatter vibration. As a result, the machined product 203 having a highly accurate machined surface can be obtained.

[0077] In step (3), the workpiece 201 may be brought closer to the cutting tool 101. In step (4), the workpiece 201 may be moved away from the cutting tool 101. When continuing the cutting process, the workpiece 201 may be kept rotating and the step of bringing the cutting blade 105 into contact with different positions of the workpiece 201 may be repeated.

[0078] The above provides examples of non-limiting embodiments of the holder 1, cutting tool 101, and manufacturing method for machined product 203. However, this aspect is not limited to the above-mentioned embodiments, and it goes without saying that any embodiment can be used as long as it does not deviate from the gist of this aspect.

[0079] For example, the components of the holder 1 may be combined with each other to form holders 1 of other embodiments.

[0080] In addition, in the above non-limiting embodiment, the cutting tool 101 is a turning tool, but instead, the cutting tool 101 can be, for example, a milling tool. When the cutting tool 101 is a milling tool, the cutting tool 101 is rotated in step (2) in the manufacturing method of the machined product 203.

[0081] 〔summary〕 A holder according to a first aspect of the present disclosure has a main body having a shape extending along a central axis from a tip to a rear end, the main body having a pocket located on the tip side into which a cutting insert can be attached, and a cavity located closer to the rear end than the pocket and extending along the central axis, and a vibration-damping member located inside the cavity, the vibration-damping member having an axial member extending along the central axis, a cylindrical weight extending along the central axis and into which the axial member is inserted, a first lid to which the axial member and the weight are fixed on the tip side, and a second lid to which the axial member and the weight are fixed on the rear end side, the weight having a cylindrical first weight member into which the axial member is inserted, a cylindrical second weight member into which the axial member and the first weight member are inserted, and a damping body located between the first weight member and the second weight member and extending from the tip side to the rear end side.

[0082] A holder according to aspect 2 of the present disclosure is similar to aspect 1, except that the weight further includes a first annular elastic member sandwiched between the first weight member and the second weight member on the tip side of the damping body, and a second annular elastic member sandwiched between the first weight member and the second weight member on the rear end side of the damping body.

[0083] A holder according to a third aspect of the present disclosure is the holder of the second aspect, wherein the damping body is a cylindrical third elastic member.

[0084] A holder according to a fourth aspect of the present disclosure is similar to the third aspect, wherein the elastic modulus of the third elastic member is smaller than the elastic modulus of the first elastic member and smaller than the elastic modulus of the second elastic member.

[0085] A holder according to a fifth aspect of the present disclosure is related to the second aspect, wherein the damping body is a liquid filled in a space surrounded by the first weight member, the second weight member, the first elastic member, and the second elastic member.

[0086] A holder according to aspect 6 of the present disclosure is any one of aspects 1 to 5, wherein the vibration-damping member has a fourth annular elastic member sandwiched between the first weight member and the first lid, and a fifth annular elastic member sandwiched between the first weight member and the second lid.

[0087] The holder according to a seventh aspect of the present disclosure is similar to the sixth aspect, except that gaps are provided between the second weight member and the first and second lids.

[0088] A holder according to aspect 8 of the present disclosure is any one of aspects 1 to 6, wherein the vibration-damping member has a sixth annular elastic member sandwiched between the second weight member and the first lid, and a seventh annular elastic member sandwiched between the second weight member and the second lid.

[0089] A holder according to a ninth aspect of the present disclosure is similar to the eighth aspect, except that gaps are provided between the second weight member and the first and second lids.

[0090] A cutting tool according to a tenth aspect of the present disclosure includes a holder according to any one of the first to ninth aspects, and a cutting insert positioned in the pocket of the holder.

[0091] A method for manufacturing a machined product according to aspect 11 of the present disclosure includes the steps of rotating a workpiece, contacting the rotating workpiece with the cutting tool of aspect 10, and removing the cutting tool from the workpiece. [Explanation of symbols]

[0092] 1 Holder 3. Main unit 3a...Tip 3b...rear end 5. Anti-vibration member 7. Pocket 9...Cavity 11...Shaft member 13... weight 15...1st lid 17...Second lid 19...First through hole 21...Second through hole 23 Front elastic member 25...Third through hole 27 Rear elastic member 29...1st weight member 31...Second weight member 33. Attenuator 35... First elastic member 37...Second elastic member 39...Third elastic member 41...Fourth elastic member 43... Fifth elastic member 45... Sixth elastic member 47 Seventh elastic member 101...Cutting tools 103···Cutting insert (insert) 105···Cutting edge 107...Through hole 109... Fixing member (screw) 201···Material 203···Cutting workpiece O1···Center axis O2···Rotation axis

Claims

1. A shape extending from the front end to the rear end along a central axis, A pocket located on the side of the tip and capable of receiving a cutting insert; a body having a cavity located closer to the rear end than the pocket and extending along the central axis; a vibration-isolating member located inside the cavity, The vibration-isolating member is A shaft member extending along the central axis; A cylindrical weight extending along the central axis and into which the shaft member is inserted; a first lid to which the shaft member and the weight are fixed on the tip side; a second lid to which the shaft member and the weight are fixed at the rear end side, The weight is a cylindrical first weight member into which the shaft member is inserted; a cylindrical second weight member into which the shaft member and the first weight member are inserted; a damping body located between the first weight member and the second weight member and extending from the tip end side to the rear end side.

2. The weight is a first elastic member having an annular shape and sandwiched between the first weight member and the second weight member on the side of the tip end relative to the attenuation body; The holder according to claim 1 , further comprising: a second elastic member having an annular shape sandwiched between the first weight member and the second weight member on the rear end side of the damping body.

3. The holder according to claim 2 , wherein the damping body is a cylindrical third elastic member.

4. The holder according to claim 3 , wherein the third elastic member has a modulus of elasticity smaller than that of the first elastic member and smaller than that of the second elastic member.

5. 3. The holder according to claim 2, wherein the damping body is a liquid filled in a space surrounded by the first weight member, the second weight member, the first elastic member, and the second elastic member.

6. The vibration-isolating member is a fourth elastic member having an annular shape and sandwiched between the first weight member and the first lid; a fifth elastic member having an annular shape and sandwiched between the first weight member and the second lid; The holder of claim 1 , comprising:

7. The holder according to claim 6 , wherein a gap is provided between the second weight member and the first lid and between the second lid and the second lid.

8. The vibration-isolating member is a sixth elastic member having an annular shape and sandwiched between the second weight member and the first lid; a seventh elastic member having an annular shape and sandwiched between the second weight member and the second lid; The holder of claim 1 , comprising:

9. The holder according to claim 8 , wherein a gap is provided between the second weight member and the first lid and between the second lid and the second lid.

10. A holder according to any one of claims 1 to 9; a cutting insert located in the pocket in the holder.

11. Rotating the workpiece; contacting the rotating workpiece with the cutting tool according to claim 10; removing the cutting tool from the workpiece; A method for manufacturing a machined product comprising the steps of:

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