JP2019202402A - Reamer and reamer manufacturing method - Google Patents

Abstract

To obtain a reamer which can further improve, for example, abrasion resistance of a single crystal diamond tip.SOLUTION: A reamer has a single crystal diamond tip. The tip has, for example, a rake face, a bottom blade surface, and an outer peripheral surface. The rake face is inclined at 16° to 20° from a {100} plane toward a [110] direction. The outer peripheral surface is inclined at 0° to 15° from the {100} plane toward the [110] direction, and extends across 75° to 90° with respect to the rake face. A plane index of the bottom blade surface is different from that of the rake face and the outer peripheral surface. When viewed from the rake face side, the outer peripheral surface and the bottom blade surface are positioned on an inner side with respect to an outer peripheral edge of the rake face.SELECTED DRAWING: Figure 10

Description

  The present disclosure relates to a reamer and a method for manufacturing a reamer.

  2. Description of the Related Art Conventionally, a reamer is known which is a cutting tool that finishes a pre-processed pilot hole with a final diameter and surface accuracy (see, for example, Patent Document 1). The reamer described in Patent Document 1 has a chip made of single crystal diamond.

JP 2001-191212 A

  In the reamer described above, the crystal face of the rake face in the chip is set to the (110) face of the Miller index. Since the (110) plane has a lower surface index than, for example, the (100) plane, further improvement in the wear resistance of the chip is desired.

  Thus, one of the problems of the present disclosure is to obtain a reamer that can further improve the wear resistance of, for example, a single crystal diamond tip.

  The reamer of the present disclosure includes, for example, a base, a rake face provided on the base, a bottom blade face that is adjacent to the rake face and extends to intersect with the rake face, the rake face, and the bottom blade face. A chip made of single crystal diamond having an outer peripheral surface adjacent to and extending to intersect with the rake face, the rake face from the {100} plane toward the [110] direction from 16 ° to 20 ° Inclined, the outer peripheral surface is inclined from 0 ° to 15 ° toward the [110] direction from the {100} surface, and extends from 75 ° to 90 ° crossing the rake surface, and the surface of the bottom blade surface The index differs from the plane index of the rake face and the outer peripheral face, and when viewed from the rake face side, the outer peripheral face and the bottom blade face are located inside the outer peripheral edge of the rake face.

  According to the said structure, the abrasion resistance of the chip | tip made from a single crystal diamond can be further improved, for example.

FIG. 1 is an exemplary schematic side view of a reamer according to the present embodiment. FIG. 2 is an exemplary schematic perspective view of a chip provided in the reamer. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is an exemplary and schematic cross-sectional view showing a state where the inner peripheral surface of the prepared hole of the work material is cut with a reamer. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a side view of an exemplary schematic reamer in which the reamer of FIG. 1 is rotated by 90 ° in the direction around the axis and the chip is viewed from the outer peripheral surface side. FIG. 8 is an enlarged view of the vicinity of the chip in FIG. FIG. 9 is a schematic diagram showing the (100) plane and the (110) plane of the crystal plane. FIG. 10 is a schematic view of FIG. 9 viewed from the Z direction. FIG. 11 is a perspective view showing a single crystal diamond used for manufacturing the chip according to the present embodiment. 12 is a schematic view of the intermediate member cut out from the single crystal diamond of FIG. 11 as seen from the P direction of FIG. FIG. 13 is a schematic view of the intermediate member cut out from the single crystal diamond of FIG. 11 as seen from the Q direction of FIG. FIG. 14 is a schematic view of the intermediate member cut out from the single crystal diamond of FIG. 11 as seen from the R direction of FIG. FIG. 15 is a perspective view showing an intermediate member cut out from the single crystal diamond of FIG. FIG. 16 is a table showing processing conditions for cutting according to the example. FIG. 17 is an enlarged photograph of the chip surface when the cutting distance in Example 1 and Comparative Examples 1 and 2 is 30 km. 18 is an enlarged photograph of the chip surface when the cutting distances in Example 1 and Comparative Example 3 are 0.5 km, 40 km, and 100 km.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Further, according to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by these configurations. In the drawings, the central axis of the tool body 30 is denoted by Ax, the axial direction of the central axis Ax is denoted by A, and the radial direction is denoted by R. Further, since the (100) plane, the (010) plane, and the (001) plane are equivalent, they can be collectively shown as {100} planes.

  FIG. 1 is an exemplary schematic side view of a reamer 1 according to this embodiment. FIG. 2 is an exemplary schematic perspective view of the chip 40 provided in the reamer 1. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. Hereinafter, the single crystal diamond tip is also simply referred to as a tip 40.

  As shown in FIG. 1, the reamer 1 according to the present embodiment includes a tool main body 30 extending in the axial direction A, and a tip 40 (a single crystal diamond tip) provided on the tool main body 30. The tool main body 30 includes a cylindrical small-diameter portion 10 and a large-diameter portion 20 that extends in the axial direction A from the tip of the small-diameter portion 10 and has a larger diameter dimension than the small-diameter portion 10. The large-diameter portion 20 is provided with a notch portion 21 described later along the axial direction A. A tip 40 is brazed to the tip of the large diameter portion 20 in the axial direction A (the lower end of the paper surface of FIG. 1). The tool body 30 is an example of a base.

  As shown in FIG. 2, the tip 40 according to the present embodiment includes a rake surface 41, a bottom blade surface 42 that is adjacent to the rake surface 41 and extends so as to intersect the rake surface 41, and the rake surface 41 and the bottom blade surface 42. And an outer peripheral surface 43 extending so as to intersect the rake surface 41 adjacent to the rake surface 41. The chip 40 is obtained by, for example, cutting and polishing a raw single crystal diamond. Single-crystal diamond can be produced by, for example, chemical vapor deposition (CVD, chemical vapor deposition) or high-temperature high-pressure synthesis (HPHT, high pressure and high temperature).

  The peripheral edge of the rake face 41 includes a first ridge line 44 extending in the radial direction R, a second ridge line 46 extending in the axial direction A, and a fourth ridge line 48 extending curvedly from the radial direction R toward the axial direction A. And having. The first ridge line 44 is a boundary line between the rake face 41 and the bottom blade face 42, and the second ridge line 46 is a boundary line between the rake face 41 and the outer peripheral face 43. The third ridge line 47 is a boundary line between the bottom blade surface 42 and the outer peripheral surface 43.

  Further, as shown in FIG. 3, the angle θ <b> 1 at which the bottom blade surface 42 intersects the vertical line VD is also the clearance angle on the bottom blade surface 42 side of the rake face 41. Here, the vertical line VD is a straight line having an intersection angle with the rake face 41 set to 90 °. The angle θ1 is, for example, 5 ° to 15 °. Further, the angle θ3 at which the rake face 41 and the bottom blade face 42 intersect is, for example, 75 ° to 85 °. Furthermore, the angle θ5 intersecting the vertical line VD and the (100) plane is, for example, 16 ° to 20 °. Therefore, the angle θ6 obtained by combining the angle θ1 and the angle θ5 is, for example, 21 ° to 35 °. Here, the angle θ6 is an inclination angle from the (100) plane toward the [110] direction, and coincides with an angle β described later.

  As shown in FIG. 4, the angle θ <b> 2 at which the outer peripheral surface 43 intersects with the vertical line VD is also the clearance angle on the outer peripheral surface 43 side of the rake face 41. The angle θ2 is, for example, 0 ° to 15 °, and preferably 0 ° to 10 °. Further, the angle θ4 at which the rake face 41 and the outer peripheral face 43 intersect is, for example, 75 ° to 90 °, and preferably 80 ° to 90 °. Furthermore, since the vertical line VD extends along the (100) plane, the crossing angle between the vertical line VD and the (100) plane is 0 °. Here, the angle θ2 is an inclination angle from the (100) plane toward the [110] direction, and coincides with an angle γ described later. From the above, since the outer peripheral surface 43 and the bottom blade surface 42 are inclined inwardly toward the lower side in FIG. 2, when the tip 40 is viewed from the rake face 41 side, the outer peripheral surface 43 and the bottom blade surface 42 are , Located inside the outer peripheral edge of the rake face 41.

  FIG. 5 is an exemplary and schematic cross-sectional view showing a state in which the inner peripheral surface 50 a of the prepared hole 51 of the work material 50 is cut with the reamer 1.

  As shown in FIG. 5, when cutting the inner peripheral surface 50 a of the prepared hole 51 of the work material 50, the reamer 1 moves toward the lower LW of the prepared hole 51 while rotating around the axis. By cutting the work material 50 into a cutting surface 50b in the vicinity of the first ridge line 44 on the rake face 41 (see FIG. 2), the diameter of the prepared hole 51 is increased. Therefore, the chip 40 receives a cutting resistance (reaction force) F1 along the axial direction A from the work material 50 by this cutting. Further, the cutting surface 50b of the prepared hole 51 is burnished in the vicinity of the second ridge line 46 on the rake face 41 (see FIG. 2). Therefore, by this burnishing, the tip 40 receives a cutting force (reaction force) F2 from the work material 50 toward the inside in the radial direction R.

  6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a side view of an exemplary schematic reamer 1 in which the reamer 1 of FIG. 1 is rotated by 90 ° about the axis and the chip 40 is viewed from the front. FIG. 8 is an enlarged view of the vicinity of the chip 40 in FIG.

  As shown in FIG. 6, the reamer 1 rotates in the direction around the central axis Ax indicated by the white arrow in the present embodiment. The tool body 30 is provided with a notch 21 that is recessed inward in the radial direction R. The notch 21 is provided on the rotational direction side in the direction around the central axis Ax. The notch 21 includes a first notch surface 22 that extends inward in the radial direction R toward the central axis Ax, and a second notch surface 23 that extends perpendicular to the first notch surface 22. Further, a groove 24 is provided at the outer end of the first notch surface 22 in the radial direction R, and the chip 40 is fixed to the groove 24.

  An angle at which the outer peripheral surface 43 and the cutting surface 50b (see FIG. 6) of the work material 50 intersect is an angle θ2 that is a clearance angle of the outer peripheral surface 43. As described with reference to FIG. 4, the clearance angle of the outer peripheral surface 43 is, for example, 0 ° to 15 °, and preferably 0 ° to 10 °. 7, the angle θ1 at which the radial direction R of the tool body 30 and the bottom blade surface 42 intersect is the clearance angle of the bottom blade surface 42 as shown in FIG. 8. . The clearance angle of the bottom blade surface 42 is, for example, 5 ° to 15 ° as described with reference to FIG.

  FIG. 9 is a schematic diagram showing the (100) plane and the (110) plane of the crystal plane. FIG. 10 is a schematic view of FIG. 9 viewed from the Z direction.

  As shown by the solid line in FIG. 9, the (100) plane of the crystal plane represented by the plane index of the Miller index intersects the X axis at (1, 0, 0) and extends parallel to the Y axis and the Z axis. The (110) plane indicated by a two-dot chain line intersects the X axis at (1, 0, 0), intersects the Y axis at (0, 1, 0), and extends parallel to the Z axis. The (100) plane has a characteristic that the wear resistance of the tip 40 is excellent. On the other hand, the (110) plane has a characteristic that the welding resistance between the tip 40 and the work material 50 is excellent.

  Next, the crystal planes of the rake face 41, the bottom blade face 42, and the outer peripheral face 43 of the chip 40 according to the present embodiment will be described with reference to FIG.

  As shown by the thick solid line in FIG. 10, the rake face 41 in the single crystal diamond tip 40 according to the present embodiment is inclined at an angle α from the (100) plane toward the [110] direction. The angle α is, for example, 16 ° to 20 °.

  As indicated by a broken line in FIG. 10, the bottom blade surface 42 is inclined by an angle β from the (100) plane toward the [110] direction. The angle β is, for example, 21 ° to 35 °.

  As indicated by a thin solid line in FIG. 10, the outer peripheral surface 43 is inclined by an angle γ from the (100) plane toward the [110] direction. The angle γ is, for example, 0 ° to 15 °, preferably 0 ° to 10 °.

Further, the angle α of the rake face 41, the angle β of the bottom blade face 42, and the angle γ of the outer peripheral face 43 are all different angles. When the angles α, β, and γ are different, the degree of wear resistance on the rake face 41, the bottom blade face 42, and the outer peripheral face 43 can be varied, and a difference can be provided in the progress of wear on each face. . Thereby, about the progress of the wear of the ridgeline generated when cutting the work material 50 with the tip 40, the progress toward the one surface adjacent to the ridgeline and the progress toward the other surface are as follows. A difference can be provided. This will be specifically described below.
As shown in FIG. 2, the rake face 41 (one face) and the outer peripheral face 43 (the other face) are located adjacent to each other via the second ridge line 46. When the work material 50 is cut with the tip 40, the wear of the second ridge line 46 progresses toward the rake face 41 and the wear progresses also toward the outer peripheral face 43. Here, as described above, since the degree of wear resistance is different between the rake face 41 and the outer peripheral face 43, the degree of progress of wear toward the rake face 41 of the second ridge line 46 and the second ridge line 46. There is a difference between the degree of progress of wear toward the outer peripheral surface 43. The same applies to the first ridge line 44 positioned at the boundary between the rake face 41 and the bottom blade surface 42 and the third ridge line 47 positioned at the boundary between the bottom blade surface 42 and the outer peripheral surface 43.
Therefore, in the present embodiment in which the angles α, β, and γ are all different from those in the same angle α, β, and γ, it is possible to suppress the increase in wear that occurs starting from the ridgeline, and the wear resistance of the tip 40 It has the characteristic that property improves.

Next, the method for manufacturing the chip 40 according to the present embodiment will be described.
FIG. 11 is a perspective view showing the single crystal diamond 100 used for manufacturing the chip 40 according to the present embodiment. 12 is a schematic view of the intermediate member 200 cut out from the single crystal diamond 100 of FIG. 11 as viewed from the P direction of FIG. FIG. 13 is a schematic view of the intermediate member 200 cut out from the single crystal diamond 100 of FIG. 11 as seen from the Q direction of FIG. FIG. 14 is a schematic view of the intermediate member 200 cut out from the single crystal diamond 100 of FIG. 11 as viewed from the R direction of FIG. FIG. 15 is a perspective view showing the intermediate member 200 cut out from the single crystal diamond 100 of FIG.

  First, in the first step, a single crystal diamond 100 shown in FIG. 11 is prepared. Single crystal diamond 100 has a rectangular parallelepiped shape, and each of the six outer surfaces has a {100} plane index. Specifically, the single crystal diamond 100 shown in FIG. 11 includes an upper surface 101 positioned on the upper side, a lower surface 102 positioned on the lower side and facing the upper surface 101 with a space in the vertical direction, and a P direction side on the upper surface 101. A left side surface 103 extending from the edge of the upper surface 101 toward the lower surface 102, a front side surface 104 extending from an edge on the Q direction side toward the lower surface 102 on the upper surface 101, and an edge from the opposite edge of the upper surface 101 in the P direction to the lower surface 102. And a rear side surface 106 extending from the edge of the upper surface 101 opposite to the Q direction to the lower surface 102. Note that the left side surface 103 and the right side surface 105 face each other with an interval therebetween. The front side surface 104 and the back side surface 106 face each other at an interval. All the surfaces from the top surface 101 to the back side surface 106 have a rectangular shape, and have a {100} surface index.

  Next, in the second step, the intermediate member 200 shown in FIG. 15 is cut out from the single crystal diamond 100 shown in FIG. The intermediate member 200 also has a rectangular parallelepiped shape.

  Before describing the second step, the outer shape of the intermediate member 200 will be described. As shown in FIG. 15, the intermediate member 200 includes a first surface 201 located on the upper side and a second surface 202 located on the lower side and extending in parallel with the first surface 201 in the vertical direction and facing each other. A third surface 203 extending from the edge of the first surface 201 on the P-direction side in FIG. 11 toward the second surface 202, and a second surface 202 from the edge of the first surface 201 on the Q-direction side in FIG. 11. A fourth surface 204 extending toward the first surface 201, a fifth surface 205 extending toward the second surface 202 from the opposite edge of the first surface 201 in the P direction of FIG. 11, and a Q of the first surface 201 in FIG. 11. And a sixth surface 206 extending from the edge opposite to the direction toward the second surface 202. Note that the third surface 203 and the fifth surface 205 extend in parallel with an interval and face each other. The fourth surface 204 and the sixth surface 206 extend in parallel at an interval and face each other.

  First, as shown in FIG. 13, the first surface 201 of the intermediate member 200 is formed by cutting the upper surface 101 of the single crystal diamond 100 shown in FIG. 11 until the angle intersecting the upper surface 101 becomes θ5. As described with reference to FIG. 3, the angle θ5 is the same angle as the intersection angle between the vertical line VD and the (100) plane, and is, for example, 16 ° to 20 °. As a result, the first surface 201 of the intermediate member 200 becomes a crystal plane inclined by 16 ° to 20 ° from the {100} plane toward the [110] direction. Further, the first surface 201 of the intermediate member 200 becomes the rake face 41 in the chip 40 of FIG. 2 as it is. Note that the second surface 202 parallel to the first surface 201 is also formed by cutting the lower surface 102 of the single crystal diamond 100.

Further, the third surface 203 and the fourth surface of the intermediate member 200 are formed by cutting the left side surface 103, the front side surface 104, the right side surface 105, and the back side surface 106 of the single crystal diamond 100 in a direction orthogonal to the first surface 201. 204, the 5th surface 205, and the 6th surface 206 are formed. The intermediate member 200 of FIG. 15 is formed by these cutting processes.
Next, in the third step, the chip 40 of FIG. 2 is cut out from the intermediate member 200 shown in FIG. As described above, the first surface 201 of the intermediate member 200 becomes the rake face 41 in the chip 40 of FIG. 2 as it is.

  First, the bottom blade surface 42 will be described. The rake face 41 of the chip 40 shown in FIG. 3 corresponds to the first face 201 of the intermediate member 200 shown in FIG. 15, and the alternate long and short dash line VD shown in FIG. 3 corresponds to the third face 203 of the intermediate member 200 shown in FIG. To do. As shown in FIG. 3, when the first edge line 44 is used as a reference, the bottom blade surface 42 is formed by cutting the first edge line 44 inward from the one-dot chain line VD until the angle θ1 is inclined. As described above, the bottom blade surface 42 is a crystal plane having a relief angle of angle θ1 and inclined by an angle θ6 from the (100) plane toward the [110] direction.

  Next, the outer peripheral surface 43 will be described. A one-dot chain line VD shown in FIG. 4 corresponds to the fourth surface 204 of the intermediate member 200 of FIG. As shown in FIG. 4, the outer peripheral surface 43 is formed when the second ridge line 46 is used as a reference and is scraped from the one-dot chain line VD inward toward the angle θ <b> 2. Thus, the outer peripheral surface 43 is a crystal plane inclined at an angle θ2 from the (100) plane toward the [110] direction at an angle θ2 that is a clearance angle. In addition, as shown by the 4th ridgeline 48 of FIG. 2, the operation | work which sharpens the corner | angular part of the intermediate member 200 to a curved shape is also performed. With the above steps, the creation of the chip 40 shown in FIG. 2 is completed.

  Next, the present embodiment will be described more specifically through examples.

  Aluminum alloy die casting (ADC12, JIS H5302), which is the work material, was cut with a single crystal diamond tip, and the amount of wear on the surface of the tip and the amount of work material deposited on the tip were compared. Specifically, a cylindrical work material (ADC12) is set on an NC lathe and the work piece is rotated at a high speed around the central axis while a single-crystal diamond tip is applied to the outer periphery of ADC12. The outer periphery was cut. The tip clearance angle was 7 °.

  The processing conditions for the cutting were as shown in FIG. For example, a cylindrical material ADC12 having a diameter of 120 mm and a height of 285 mm was used as the work material, and the cutting speed was a rotational speed at which the work material advanced 250 m per minute with respect to the chip. When the work material is rotated once, the work material moves 0.15 mm in the axial direction of the work material, and the cutting amount when the insert cuts the outer periphery of the work material is 0.5 mm in diameter. The coolant used for cutting was 10% soluble.

  First, Example 1 and Comparative Examples 1 and 2 shown in FIG. 17 will be described. In the chip of Example 1, the crystal face of the rake face was tilted 20 ° from the (100) face toward the [110] direction. The crystal plane of the outer peripheral surface was defined as the (100) plane. In Comparative Example 1, the crystal face of the rake face was the (110) face, and the crystal face of the outer peripheral face was the (100) face. In Comparative Example 2, the crystal face of the rake face was the (110) face, and the crystal face of the outer peripheral face was the (110) face.

  The wear amount of the rake face when the cutting distance was 30 km was 4.1 μm in Example 1, 13.64 μm in Comparative Example 1, and 11 μm in Comparative Example 2. Therefore, it was found that Example 1 is superior to Comparative Examples 1 and 2 in that the amount of wear of the tip is small.

  Next, Example 1 and Comparative Example 3 shown in FIG. 18 will be described. In the chip of Comparative Example 3, the crystal face of the rake face was a face inclined by 15 ° from the (100) face toward the [110] direction. The crystal plane of the outer peripheral surface was defined as the (100) plane.

  In Comparative Example 3, welding of the work material occurred on the rake face when the cutting distance was 40 km. However, in Example 1, no welding occurred until the cutting distance was 100 km. Further, when comparing the wear amount of the rake face, Example 1 was 12.9 μm, and Comparative Example 3 was 15 μm. In Example 1, the wear amount was smaller. Therefore, it was found that Example 1 was superior to Comparative Example 3 in that the work material was not welded and the wear amount of the insert was small. From the above, it was confirmed that Example 1 is superior to Comparative Examples 1 to 3.

  As described above, the reamer 1 according to the present embodiment includes the tip 40 made of single crystal diamond having the rake face 41, the bottom blade face 42, and the outer peripheral face 43, for example. The face index of the rake face 41 is inclined by an angle α (16 ° to 20 °) from the {100} plane toward the [110] direction. The outer peripheral surface 43 is inclined at an angle γ (0 ° to 15 °) from the {100} plane toward the [110] direction, and extends from the rake 41 surface by 75 ° to 90 °. The bottom blade surface 42 is inclined at an angle β from the (100) plane toward the [110] direction, and the surface index of the bottom blade surface 42 is different from the surface indexes of the rake face 41 and the outer peripheral surface 43. Further, when viewed from the rake face 41 side, the outer peripheral face 43 and the bottom blade face 42 are located inside the outer peripheral edge of the rake face 41.

  Since single crystal diamond has the property that the {100} plane has better wear resistance than other crystal planes, the reamer 1 according to the present disclosure can further improve the wear resistance of the chip 40 made of single crystal diamond. Can do. In addition to the wear resistance, an effect excellent in welding resistance can be obtained. Details will be described below.

  First, in order to obtain high wear resistance, the rake face 41, the bottom blade face 42, and the outer peripheral face 43 of the tip 40 are considered on the basis of the {100} plane. However, while the {100} plane is excellent in wear resistance, it is inferior to, for example, the {110} plane in terms of welding resistance. Therefore, from the viewpoint of satisfying the characteristics of high wear resistance and welding resistance, the crystal planes of the rake face 41, the bottom blade face 42, and the outer peripheral face 43 are angled α from the {100} plane toward the [110] direction. , Β, and γ are considered to be desirable. For example, as shown in the above-described example, the crystal face of the rake face 41 is more wear-resistant than the comparative examples 1 to 3, in which the example 1 tilted 20 ° from the {100} plane toward the [110] direction. Good effects were obtained in both resistance and welding resistance.

  Further, as described above, the rake face 41 is inclined by the angle α from the {100} plane toward the [110] direction, and the bottom blade face 42 is inclined by the angle β from the {100} plane toward the [110] direction, and the outer peripheral surface. 43 is inclined by an angle γ from the {100} plane toward the [110] direction. These angles α, β, γ are all different. When the angles α, β, and γ are different, as described above, the degree of wear resistance on the rake face 41, the bottom blade face 42, and the outer peripheral face 43 can be made different, and the difference in the progress of wear on each face is different. Can be provided. Thereby, about the progress of the wear of the ridgeline generated when cutting the work material 50 with the tip 40, the progress toward the one surface adjacent to the ridgeline and the progress toward the other surface are as follows. A difference can be provided.

  Further, the bottom blade surface 42 is inclined 21 ° to 35 ° from the {100} plane toward the [110] direction, and extends so as to intersect the rake surface 41 by 75 ° to 85 °. Accordingly, the angle θ1 that is the clearance angle of the rake face 41 on the bottom blade surface 42 side is an appropriate angle of 5 ° to 15 °, so that the cutting efficiency by the bottom blade surface 42 is improved. Further, since the bottom blade surface 42 has a surface index closer to the (110) surface than the rake surface 41, the welding resistance of the bottom blade surface 42 is improved.

  The outer peripheral surface 43 is inclined by 0 ° to 10 ° from the {100} plane toward the [110] direction and extends so as to intersect the rake surface 41 by 80 ° to 90 °. The outer surface 43 has a surface index closer to the {100} plane than when the outer peripheral surface 43 is tilted from 0 ° to 15 ° toward the [110] direction from the {100} plane. Accordingly, the wear resistance of the outer peripheral surface 43 is further improved.

  Further, the manufacturing method of the chip 40 includes a step of preparing a single crystal diamond 100 having a rectangular parallelepiped shape and each of six outer surfaces having a {100} plane index, and a rake face obtained by shaving the single crystal diamond 100. 41, cutting the single crystal diamond 100 to form the outer peripheral surface 43, and cutting the single crystal diamond 100 to form the bottom blade surface 42.

  In this way, the single crystal diamond 100 is cut to produce the single crystal diamond tip 40 having the rake face 41, the bottom blade face 42, and the outer peripheral face 43.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example and is not intending limiting the range of invention. The embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the scope of the invention. In addition, the configuration and shape of each example can be partially exchanged. In addition, the specifications (structure, type, direction, shape, size, length, width, height, number, arrangement, position, etc.) of each configuration and shape can be changed as appropriate.

  For example, in the embodiment, after the intermediate member 200 is cut out from the single crystal diamond 100, the intermediate member 200 is further cut to form the bottom blade surface 42 and the outer peripheral surface 43. However, the chip 40 may be cut directly from the single crystal diamond 100 without using the intermediate member 200.

  DESCRIPTION OF SYMBOLS 30 ... Tool body (base), 40 ... Tip (single crystal diamond tip), 41 ... Rake face, 42 ... Bottom blade face, 43 ... Outer peripheral face

Claims (6)

Base and
A rake face provided on the base; a bottom blade face extending adjacent to the rake face and intersecting the rake face; and the rake face and the bottom blade face adjacent to the rake face. A single crystal diamond tip having an outer peripheral surface extending in the direction of
With
The rake face is inclined by 16 ° to 20 ° from the {100} plane toward the [110] direction,
The outer peripheral surface is inclined by 0 ° to 15 ° from the {100} plane toward the [110] direction, and extends to intersect the rake surface by 75 ° to 90 °.
The surface index of the bottom blade surface is different from the surface index of the rake surface and the outer peripheral surface,
When viewed from the rake face side, the outer peripheral face and the bottom blade face are located inside the outer peripheral edge of the rake face,
Reamer. The bottom blade surface is inclined by 21 ° to 35 ° from the {100} plane toward the [110] direction, and extends so as to intersect with the rake surface by 75 ° to 85 °.
The reamer according to claim 1. The outer peripheral surface is inclined by 0 ° to 10 ° from the {100} plane toward the [110] direction, and extends to intersect the rake surface by 80 ° to 90 °.
The reamer according to claim 1 or 2. A method for producing a reamer according to claim 1,
Providing a single crystal diamond having a rectangular parallelepiped shape and each of the six outer surfaces having a {100} face index;
Scraping the single crystal diamond to form the rake face;
Scraping the single crystal diamond to form the outer peripheral surface;
Cutting the single crystal diamond to form the bottom blade surface;
Reamer manufacturing method including In the step of forming the bottom blade surface,
The bottom blade surface is inclined by 21 ° to 35 ° from the {100} plane toward the [110] direction, and extends so as to intersect with the rake surface by 75 ° to 85 °.
The manufacturing method of the reamer of Claim 4. The outer peripheral surface is inclined by 0 ° to 10 ° from the {100} plane toward the [110] direction, and extends to intersect the rake surface by 80 ° to 90 °.
The method for producing a reamer according to claim 4 or 5.