tool

Abstract

To provide a tool that can process a work-piece in a columnar shape made from a raw material with high hardness, with high processing efficiency.SOLUTION: A tool 1 comprises a shank 2 extending along a rotating shaft Z, a hollow cylindrical body 3 jointed integrally to the shank 2, and a blade part 4 jointed to an end part 31 of the body 3 to be integral with the body 3. The blade part 4 has a diamond sintered body 5 at a tip thereof. The diamond sintered body 5 has an outer peripheral cutting blade 51 provided on an outer peripheral surface to sharpen outward, an inner peripheral cutting blade 52 provided on an inner peripheral surface to sharpen inward, and a bottom cutting blade 53 provided on a tip surface to sharpen toward a tip.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0005] , ,

[0001] The present invention relates to a tool.

Background Art

[0002] Conventionally, when forming a plurality of columnar processed products from a disk-shaped material such as a cemented carbide made of a high-hardness material or a CVD-SiC (chemical vapor deposition silicon carbide) made by a chemical vapor deposition method, it may be used as a material for a mold for lens forming, etc.

Prior Art Document

Patent Document

[0003]

Patent Document 1

[0007] According to the present invention, a tool can be provided that can process cylindrical workpieces from high-hardness materials with high processing efficiency. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view illustrating a tool according to the first embodiment. [Figure 2] This is a plan view of the tool according to the first embodiment. [Figure 3] This is a front view of the tool according to the first embodiment. [Figure 4] This is a detailed view of section A in Figure 2. [Figure 5] This is a detailed view of section B in Figure 3. [Figure 6] This is a perspective view illustrating a tool according to the second embodiment. [Figure 7] This is a plan view of the tool according to the second embodiment. [Figure 8] This is a front view of the tool according to the second embodiment. [Figure 9] Figure 7 is a detailed view of section C. [Figure 10] This is a detailed view of section D in Figure 8. [Modes for carrying out the invention]

[0009] (First Embodiment) The tool 1 according to the first embodiment will be described below with reference to the drawings. Figure 1 is a perspective view illustrating the tool 1 according to the first embodiment. Figure 2 is a plan view of the tool 1 according to the first embodiment. Figure 3 is a front view of the tool 1 according to the first embodiment. Figure 4 is a detailed view of part A in Figure 2. Figure 5 is a detailed view of part B in Figure 3. Hereafter, unless otherwise specified, the direction toward the cutting edge 4 of the tool 1 along the axis of rotation Z will be referred to as the forward direction, and the direction toward the shank 2 of the tool 1 will be referred to as the rear direction. As shown in Figure 2, in a plan view of the tool 1, the direction of rotation counterclockwise around the axis of rotation Z will be referred to as the forward direction, and the direction of rotation clockwise will be referred to as the reverse direction. The direction away from the axis of rotation Z will be referred to as the outward direction, and the direction toward the axis of rotation Z will be referred to as the inward direction.

[0010] As shown in Figure 1, the tool 1 according to the first embodiment is also known as a hole saw or core drill, and it cuts the material to be processed into a circular shape and cuts out the core located towards the center of the cut portion in a cylindrical shape. In detail, tool 1 comprises a shank 2 extending along the axis of rotation Z, a hollow cylindrical body 3 integrally coupled to the shank 2, and a cutting edge 4 integrally coupled to the body 3 at its end 31. The cutting edge 4 has a diamond sintered body (also called PCD) 5 at its tip. This allows for the formation of cylindrical workpieces from materials with high hardness, such as CVD-SiC. As shown in Figures 4 and 5, the diamond sintered body 5 has an outer peripheral cutting edge 51 on its outer peripheral surface 5E that points outward, an inner peripheral cutting edge 52 on its inner peripheral surface 5J that points inward, and a bottom cutting edge 53 on its tip surface 5T that points forward. Since the outer peripheral cutting edge 51, inner peripheral cutting edge 52, and bottom cutting edge 53 are provided on the diamond sintered body 5 in this way, it is possible to directly cut a cylindrical shape from a disc-shaped material made of a material with high hardness such as CVD-SiC. Therefore, the process of cutting a grid pattern from the disc-shaped material to form a prism can be omitted. Thus, cylindrical processed products can be manufactured from high-hardness materials with high processing efficiency.

[0011] The shank 2 is a handle portion that is gripped and fixed by a chuck of a rotating machine (not shown). The shank 2 is a cylindrical rod-shaped body extending along the rotation axis Z of the tool 1. The shank 2 may be integrally formed with the body 3 or may be coupled to the body 3 by appropriate means such as screwing, welding, or press welding. The outer diameter dimension of the shank 2 may be smaller than the outer diameter dimension of the body 3. The material of the shank 2 may be, for example, carbon tool steel (JIS G4401 - 2006) used for tools that cut metals and the like. The material of the shank 2 may be the same as the material of the body 3. The shank 2 may be a hollow cylindrical shape having a through hole in a cylindrical center for supplying a coolant for cooling.

[0012] The body 3 is coupled to the shank 2. The body 3 is a hollow cylindrical portion extending along the rotation axis Z of the tool 1. The body 3 has, for example, an inner diameter of 𝜙20 mm. The body 3 may be integrally formed with the shank 2 or may be coupled to the shank 2 by appropriate means such as screwing, welding, or press welding. The inner diameter dimension or the outer diameter dimension of the body 3 may be larger than the outer diameter dimension of the shank 2. The material of the body 3 may be, for example, carbon tool steel (JIS G4401 - 2006) used for tools that cut metals and the like. The material of the body 3 may be the same as the material of the shank 2.

[0013] At the end 31 of the body 3, a blade portion 4 coupled to the body 3 is provided. Note that the body 3 and the blade portion 4 may be integrally formed by coupling separate members by brazing or the like. The end 31 of the body 3 has a fitting groove 3Q that meshes with a locking projection 4P formed on the blade portion 4. Thereby, a mechanical resistance force is added to the bonding force by brazing, so that the resistance to the shearing force acting in the twisting direction of the tool 1 at the boundary between the body 3 and the blade portion 4 can be increased.

[0014] The blade portion 4 is an annular shape centered on the rotation axis Z of the tool 1. The blade portion 4 has an inner diameter and an outer diameter similar to those of the body 3. The blade portion 4 may be integrally formed with the body 3, or it may be joined to the body 3 by appropriate means such as screwing, welding, or pressure welding. For example, the blade portion 4 may be joined to the body 3 by brazing. The maximum dimension of the outer diameter portion of the blade 4 (the maximum dimension formed by the outer peripheral finishing surface S1, which is the trajectory of the outer peripheral cutting edge 51 rotating around the rotation axis Z) is greater than the outer diameter dimension of the body 3. The minimum dimension of the inner diameter portion of the blade 4 (the minimum dimension formed by the inner peripheral finishing surface S2, which is the trajectory of the inner peripheral cutting edge 52 rotating around the rotation axis Z) is smaller than the inner diameter dimension of the body 3. Furthermore, it is preferable that the rotational trajectory S11 of the smallest diameter portion, which is the deepest part of the outer peripheral relief groove G1 of the outer peripheral cutting edge 51, is slightly larger than the outer diameter dimension of the body 3. It is preferable that the rotational trajectory S21 of the largest diameter portion, which is the deepest part of the inner peripheral relief groove G2 of the inner peripheral cutting edge 52, is slightly smaller than the inner diameter dimension of the body 3. This allows the entire cross-section of the body 3 to be effectively utilized, ensuring that torque is reliably transmitted from the body 3 to the blade portion 4. In addition, this allows chips generated by cutting to be effectively released from the blade portion 4 towards the body 3 through the gap created between the finished surface of the blade portion 4 and the body 3.

[0015] The diamond sintered body 5 provided at the tip of the blade portion 4 has an outer cutting edge 51, an inner cutting edge 52, and a bottom cutting edge 53. As shown in Figures 1 to 5, the outer cutting edge 51 extends linearly along the axis of rotation Z. The inner cutting edge 52 extends linearly along the axis of rotation Z. The bottom cutting edge 53 extends linearly radially outward from the axis of rotation Z. Here, the outer cutting edge 51, the inner cutting edge 52, and the bottom cutting edge 53 formed on the blade portion 4 are continuous. In other words, the straight line formed by the cutting edge of the outer circumferential cutting edge 51, the straight line formed by the cutting edge of the inner circumferential cutting edge 52, and the straight line formed by the cutting edge of the bottom cutting edge 53 are connected from the outer circumferential surface 5E through the tip surface 5T to the inner circumferential surface 5J. As a result, the material can be cut with high precision along the outer circumferential finishing surface S1, the inner circumferential finishing surface S2, and the bottom finishing surface S3.

[0016] The outer cutting edge 51, inner cutting edge 52, and bottom cutting edge 53 are each arranged in multiples at equal intervals along the rotational direction R. This allows the cutting resistance to be evenly distributed across multiple cutting edges. Therefore, the load acting on each cutting edge can be reduced, enabling high-hardness materials to be cut with high precision.

[0017] As shown in Figures 4 and 5, the outer circumferential surface 5E has an outer circumferential relief groove G1 that is recessed inward from the outer circumferential cutting edge 51. The inner circumferential surface 5J has an inner circumferential relief groove G2 that is recessed outward from the inner circumferential cutting edge. The tip surface 5T has a bottom relief groove G3 that is recessed rearward from the bottom cutting edge 53. This ensures that the amount of material chips generated during cutting by the cutting edge can be relieved. Therefore, the rotational resistance of the tool 1 during cutting can be reduced.

[0018] When the outer cutting edge 51, the inner cutting edge 52, and the bottom cutting edge 53 formed on the blade portion 4 are continuous, the relief grooves formed between adjacent cutting edges in the rotational direction are also continuous. That is, the outer relief groove G1, the bottom relief groove G3, and the inner relief groove G2 may be continuous. This allows the chips generated by cutting with the cutting edge to move freely from the outer surface 5E through the tip surface 5T to the inner surface 5J. Therefore, the rotational resistance of the tool 1 during cutting can be reduced.

[0019] As shown in Figure 4, the outer peripheral relief groove G1 has an outer peripheral positive relief surface G1a that is inclined toward the forward rotation side (rotation direction R) from the outer peripheral cutting edge 51, and an outer peripheral reverse relief surface G1b that is inclined toward the reverse rotation side (opposite direction to rotation direction R) from the outer peripheral cutting edge 51, with respect to the outer peripheral finishing surface S1 made by the outer peripheral cutting edge 51. The inner circumferential relief groove G2 has an inner circumferential forward relief surface G2a that is inclined toward the forward rotation side from the inner circumferential cutting edge 52, and an inner circumferential reverse relief surface G2b that is inclined toward the reverse rotation side from the inner circumferential cutting edge 52, with respect to the inner circumferential finishing surface S2 made by the inner circumferential cutting edge 52. Furthermore, the outer positive relief angle θ1a formed by the outer finishing surface S1 and the outer positive relief surface G1a is equal to the outer negative relief angle θ1b formed by the outer finishing surface S1 and the outer negative relief surface G1b, and the inner positive relief angle θ2a formed by the inner finishing surface S2 and the inner positive relief surface G2a is equal to the inner negative relief angle θ2b formed by the inner finishing surface S2 and the inner negative relief surface G2b. This allows for a good balance between ensuring the strength of the cutting edge and ensuring the amount of chip relief, while also reducing cutting resistance.

[0020] The blade portion 4 may have a backing carbide portion 6 that is integrally bonded to the diamond sintered body 5 and the body 3, respectively, which are provided at the tip. In other words, the diamond sintered body 5 and the body 3 may be bonded via the backing carbide portion 6. This forms a cutting edge and concentrates the hard diamond sintered body 5 at the tip of the tool 1. Therefore, it becomes easier to cut hard materials. In addition, the diamond sintered body 5 can be bonded to the body 3 via the backing carbide portion 6. Therefore, the blade portion 4 can be firmly bonded to the body 3. The diamond sintered body 5 may also be directly bonded to the body 3. That is, the blade portion 4 made of the diamond sintered body 5 may be directly bonded to the body 3.

[0021] The hardness of the carbide backing 6 is preferably lower than the hardness of the diamond sintered body 5 and higher than the hardness of the body 3. The material of the carbide backing 6 is preferably, for example, a cemented carbide alloy obtained by sintering tungsten carbide and cobalt. This reduces hardness reduction and wear at high temperatures, and allows the torsional moment acting on the tool 1 to be smoothly transmitted from the shank 2 and body 3 through the carbide backing 6 to the diamond sintered body 5.

[0022] (Second Embodiment) Next, the tool 1 according to the second embodiment will be described with reference to the drawings. In the description of the second embodiment, the same reference numerals may be used for feature parts that have functions common to the first embodiment. In the description of the second embodiment, the description of feature parts that have functions common to the first embodiment may be omitted. Figure 6 is a perspective view illustrating the tool 1 according to the second embodiment. Figure 7 is a plan view of the tool 1 according to the second embodiment. Figure 8 is a front view of the tool 1 according to the second embodiment. Figure 9 is a detailed view of section C in Figure 7. Figure 10 is a detailed view of section D in Figure 8.

[0023] As shown in Figure 6, the tool 1 according to the second embodiment, like the tool 1 according to the first embodiment, comprises a shank 2 extending along the axis of rotation Z, a hollow cylindrical body 3 integrally coupled to the shank 2, and a cutting edge 4 integrally coupled to the body 3 at the end 31 of the body 3. The cutting edge 4 has a diamond sintered body 5 at its tip.

[0024] As shown in Figure 9, similar to the tool 1 according to the first embodiment, the outer peripheral relief groove G1 has an outer peripheral positive relief surface G1a that is inclined toward the forward rotation side (rotation direction R) from the outer peripheral cutting edge 51, and an outer peripheral reverse relief surface G1b that is inclined toward the reverse rotation side (opposite direction to rotation direction R) from the outer peripheral cutting edge 51, with respect to the outer peripheral finishing surface S1 made by the outer peripheral cutting edge 51. The inner circumferential relief groove G2 has an inner circumferential forward relief surface G2a that is inclined toward the forward rotation side from the inner circumferential cutting edge 52, and an inner circumferential reverse relief surface G2b that is inclined toward the reverse rotation side from the inner circumferential cutting edge 52, with respect to the inner circumferential finishing surface S2 made by the inner circumferential cutting edge 52. Furthermore, the outer peripheral positive relief angle θ1a formed by the outer peripheral finishing surface S1 and the outer peripheral positive relief surface G1a is equal to the outer peripheral negative relief angle θ1b formed by the outer peripheral finishing surface S1 and the outer peripheral negative relief surface G1b, and the inner peripheral positive relief angle θ2a formed by the inner peripheral finishing surface S2 and the inner peripheral positive relief surface G2a is equal to the inner peripheral negative relief angle θ2b formed by the inner peripheral finishing surface S2 and the inner peripheral negative relief surface G2b.

[0025] Here, as shown in Figure 10, the tool 1 according to the second embodiment differs from the tool 1 according to the first embodiment in that the bottom relief groove G3 has a bottom forward relief surface G3a that is inclined toward the forward rotation side from the bottom cutting edge 53, and a bottom reverse relief surface G3b that is inclined toward the reverse rotation side from the bottom cutting edge 53, with reference to the bottom finishing surface S3 made by the bottom cutting edge 53. Furthermore, the positive relief angle θ3a formed by the bottom finishing surface S3 and the bottom positive relief surface G3a is equal to the negative relief angle θ3b formed by the bottom finishing surface S3 and the bottom negative relief surface G3b. As a result, the material can be cut with the same resistance and accuracy regardless of whether the tool 1 is rotated in forward or reverse direction. Therefore, the tool 1 can be made without restrictions on the direction of rotation R.

[0026] As described above, the tool 1 according to this embodiment comprises a shank 2 extending along the rotation axis Z, a hollow cylindrical body 3 integrally connected to the shank 2, and a cutting edge 4 integrally connected to the body 3 at the end 31 of the body 3. The cutting edge 4 has a diamond sintered body 5 at its tip. Here, the diamond sintered body 5 has an outer peripheral cutting edge 51 provided on the outer peripheral surface 5E that points outward, an inner peripheral cutting edge 52 provided on the inner peripheral surface 5J that points inward, and a bottom cutting edge 53 provided on the tip surface 5T that points forward. This makes it possible to directly cut out a cylindrical shape from a disc-shaped material made of a material with high hardness such as CVD-SiC. Therefore, the process of cutting a grid pattern from a disc-shaped material to form a prism can be omitted. Thus, cylindrical workpieces can be processed from high-hardness materials with high processing efficiency.

[0027] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0028] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present invention. Also, the above modifications may be combined as appropriate, without departing from the spirit of the present invention. For example, although cemented carbide and CVD-SiC are described as examples in this embodiment, it is not limited to these materials and is characterized by being applicable to a wide range of molding dies such as ceramic molds and metal molds. [Explanation of Symbols]

[0029] 1 tool 2 Shank 3 Body 3Q fitting groove 4 Blade part 4P Locking projection 5. Diamond sintered body 5E Outer surface 5J Inner surface 5T tip surface 6. Backing carbide section 31 End 51 Outer edge cutting edge 52 Inner cutting edge 53 Bottom cutting blade G1 Outer circumference relief groove G1a External positive flank surface G1b Outer edge reverse relief surface G2 Inner Circumference Relief Groove G2a Inner circumference positive flank G2b Inner circumference reverse flank G3 Bottom relief groove G3a Bottom positive flank G3b Bottom reverse relief surface R rotation direction S1 Finished outer periphery S2 Inner circumference finished surface S3 bottom surface Z axis of rotation θ1a External positive relief angle θ1b Reverse relief angle of outer circumference θ2a Inner circumference positive relief angle θ2b Inner circumference reverse relief angle θ3a Base positive relief angle θ3b Bottom reverse relief angle

Claims

1. A shank extending along the axis of rotation, and a hollow cylindrical body integrally connected to the shank, The body comprises a blade portion integrally connected to the body at its end, The blade portion has a diamond sintered body at its tip. The diamond sintered body has an outer peripheral cutting edge provided on the outer peripheral surface that is pointed outward, an inner peripheral cutting edge provided on the inner peripheral surface that is pointed inward, and a bottom cutting edge provided on the tip surface that is pointed towards the front, The outer circumferential surface has an outer circumferential relief groove that is recessed inward from the outer circumferential cutting edge, The inner surface has an inner relief groove that is recessed outward from the inner cutting edge. The aforementioned tip surface has a bottom relief groove that is recessed rearward from the bottom cutting edge. tool.

2. The tool according to claim 1, wherein the outer cutting edge, the inner cutting edge, and the bottom cutting edge are continuous.

3. The outer circumferential cutting edge, the inner circumferential cutting edge, and the bottom cutting edge are each arranged in multiples at equal intervals along the direction of rotation. The tool according to claim 1 or claim 2.

4. The outer peripheral relief groove has an outer peripheral forward relief surface that is inclined toward the forward rotation side from the outer peripheral cutting edge, and an outer peripheral reverse relief surface that is inclined toward the reverse rotation side from the outer peripheral cutting edge, with reference to the outer peripheral finishing surface made by the outer peripheral cutting edge. The inner circumferential relief groove has an inner circumferential forward relief surface that is inclined toward the forward rotation side from the inner circumferential cutting edge, and an inner circumferential reverse relief surface that is inclined toward the reverse rotation side from the inner circumferential cutting edge, with reference to the inner circumferential finishing surface made by the inner circumferential cutting edge. The outer peripheral relief angle formed by the outer peripheral finishing surface and the outer peripheral positive relief surface, and the outer peripheral reverse relief angle formed by the outer peripheral finishing surface and the outer peripheral reverse relief surface are equal, The positive relief angle formed by the inner circumferential finishing surface and the positive relief surface, and the negative relief angle formed by the inner circumferential finishing surface and the negative relief surface, are equal. The tool according to claim 1.

5. The bottom relief groove has a bottom forward relief surface that slopes toward the forward rotation side from the bottom cutting edge, and a bottom reverse relief surface that slopes toward the reverse rotation side from the bottom cutting edge, with reference to the bottom finishing surface made by the bottom cutting edge. The bottom positive relief angle formed by the bottom finished surface and the bottom positive relief surface is equal to the bottom negative relief angle formed by the bottom finished surface and the bottom negative relief surface. The tool according to claim 4.

6. The blade portion has a backing carbide portion that is integrally bonded to the diamond sintered body and the body, respectively. The tool according to claim 1 or claim 2.

7. The hardness of the carbide backing is lower than the hardness of the diamond sintered body, but higher than the hardness of the body. The tool according to claim 6.

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