JP5031500B2 - Manufacturing method of diamond cutting member - Google Patents

Description

  The present invention relates to a diamond cutting member, and more particularly, to a technique for suppressing a decrease in life due to a constituent cutting edge of a diamond cutting member using artificial diamond and manufacturing such a diamond cutting member easily and inexpensively.

  There has been proposed a diamond cutting member which is provided with a cutting edge and a rake face using single crystal diamond as a raw material and is integrally fixed to a predetermined holder such as a base metal or a shank and used for cutting. Diamond tools and diamond chips described in Patent Documents 1 and 2 are examples thereof, and are suitably used for mirror cutting of soft non-ferrous metal materials such as aluminum and copper alloys. And it is proposed to use an artificial diamond as such a diamond (refer patent documents 3 and 4). In the case of an artificial diamond, although the wear resistance is generally inferior to that of natural diamond, individual variations are small and stable quality (wear resistance) can be obtained.

  An artificial diamond is basically a hexahedral shape having six {100} faces, that is, a cube or a rectangular parallelepiped in which adjacent faces are perpendicular to each other. 9 (a) and 9 (b) are examples thereof, and the artificial diamond 10 of FIG. 9 (a) has a simple rectangular parallelepiped shape and includes six planes 12 represented by {100}. The artificial diamond 14 in (b) has a shape having a chamfered flat surface 16 at the corner of the artificial diamond 10 in (a). The chamfered flat surface 16 is generated depending on the manufacturing conditions of the artificial diamond 14 and the like. In the present specification, the artificial diamond 14 including the chamfered flat surface 16 is referred to as the artificial diamond 10 and described. Note that “{...}” Is a Miller index and represents a crystal plane in which atoms are arranged in a fixed arrangement. In the case of diamond, in addition to the {100} plane as shown in FIG. The {111} plane and the {110} plane are generally known. Natural diamonds often have octahedral or dodecahedron basic shapes. In the case of octahedrons, all faces are composed of {111} faces. All the surfaces are constituted by {110} surfaces. In (a) to (c) of FIG. 12, the left diagram is a three-dimensional model for explaining the crystal plane, and the right diagram is a diagram showing the arrangement of atoms in each crystal plane.

When the artificial diamond 10 is used as a cutting member, since it is difficult to process, for example, one of the {100} faces is used as the rake face 20 as shown in FIG. For example, as shown in FIG. 10 (b), a cylindrical work material 30 is rotated around the axis center by using the front flank 22 and a ridge line where the front flank 22 and the rake face 20 intersect as a cutting edge 24. The cutting edge 24 is pressed against the outer peripheral surface while being moved relative to each other in the axial direction of the work material 30 and used for turning or the like for cutting the outer peripheral surface. Such an artificial diamond 10 is attached to the tip of a shank (not shown) and used as a cutting tool. In FIG. 10B, the cutting tool 30 is arranged in the axial direction with respect to the work material 30 as indicated by a white arrow. It can be moved. Note that lateral relief surfaces 26 are provided on both sides of the front relief surface 22 as necessary. The front flank 22 is desirably polished and removed obliquely so as to have a predetermined clearance angle.
Japanese Patent Laid-Open No. 2-145201 JP 2000-107912 A Japanese Patent Laid-Open No. 60-16306 JP 2002-254212 A

  By the way, since the {100} plane is relatively dense, excellent wear resistance is obtained for the rake face 20 and the front flank face 22. The cutting edge 24 is constituted by a ridge line of the single crystal artificial diamond 10, and the ridge line is the one shown in FIG. Thus, it has wear resistance similar to that of the {110} plane, and the ridge line, that is, the cutting edge 24 can be regarded as the {110} plane. Therefore, excellent wear resistance can be obtained with respect to the back component force and the main component force (see FIG. 10B) perpendicular to the cutting edge 24, but in the direction parallel to the cutting edge 24, that is, It is weak against the load in the direction of the feed component force, and as shown in FIG. 10 (b), sufficient wear resistance can be obtained when turning the workpiece by moving it in the axial direction of the work material 30. I can't.

  On the other hand, as described above, it is relatively easy to polish and remove the ridge line portion of the artificial diamond 10, so as shown in FIG. By polishing and removing with a diamond polishing machine such as a (skive) machine, one side is used as a rake face 36 and the other is used as an adhesive face 38 so as to be integrally bonded to a holder 40 such as a shank. 42 may be used for the turning process shown in FIG. In this case, the {110} surface having the lowest wear resistance is the rake face 36, and the cutting edge 42 is a face inclined by a predetermined angle from the {110} face, so that the rake face 20 is {100} as shown in FIG. } The durability is improved compared to the case where the cutting edge 24 is {110} face.

  However, since the {110} plane constituting the rake face 36 has a honeycomb structure having a relatively large hole as is apparent from FIG. 12, chips of the work material 30 such as aluminum are cut. Penetrates into the hole, and the cutting edge is likely to be generated due to the chips, and the tool life is deteriorated. Since the chips penetrate into the artificial diamond 10, the constituent cutting edges are generated early even after re-polishing, and a sufficient tool life cannot be obtained.

  On the other hand, as a method of directly bonding the artificial diamond 10 to the holder 40, an adhesion technique using an active metal brazing is known, but a sufficient bonding area is necessary to obtain a sufficient bonding strength by the active metal brazing, Since the bonding surface 38 must be made sufficiently large, there is another problem that the polishing process of the bonding surface 38 is troublesome and takes time, and the manufacturing cost increases. Further, since the bonding surface 38 is a flat surface, it is difficult to position the holder 40 and it is difficult to ensure sufficient positional accuracy. As a result, the position accuracy of the surface 36 that is easy to cut with respect to the holder 40 is impaired. There is a possibility, and it is necessary to provide a step or the like for positioning. In addition, the adhesion by the above active metal brazing produces a film of an active metal such as titanium (Ti) or chromium (Cr) on the surface by heating the artificial diamond 10 in a deoxygenated atmosphere (metallized), and silver and copper. The artificial diamond 10 is directly bonded to the holder 40 such as a cemented carbide alloy.

  The present invention has been made in the background of the above circumstances, and the object of the present invention is a {110} face in a diamond cutting member in which a cutting edge and a rake face are formed using an artificial diamond capable of obtaining stable quality. As compared with the case of using a rake face, the generation of a cutting edge is suppressed, and an excellent tool life is obtained in combination with wear resistance, while such a diamond cutting member can be easily and inexpensively manufactured. Is to make it.

The first invention is basic to the blade and rake face cutting a single crystal of artificial diamond hexahedral shape with six {100} plane as a material is provided, it is integrally fixed to a predetermined holder cutting A method of manufacturing a diamond cutting member used for processing, comprising: (a) a holder manufacturing step in which a holder having a V-shaped groove having a right-angle cross section is prepared; and (b) the hexahedral shape of the V-shaped groove. A fixing step of fitting and integrally fixing the first ridge line portion of the artificial diamond, positioning the pair of side surfaces adjacent to the first ridge line so as to be in close contact with the pair of wall surfaces of the V-shaped groove, respectively; (c) the by second ridges partial polishing removal of diagonal positions relative fitted into was the first ridge line in a V-groove possess a polishing step of forming a rake face, a, and, (d) The rake face is a cut provided at one end in the longitudinal direction of the second ridge line. As it goes to the blade side, it is inclined from the {110} plane to the {111} plane side at a predetermined inclination angle θ within a range of 5 ° to 30 °. (E) The V-shaped groove has a pair of wall surfaces. It is provided on the flat mounting surface of the holder so as to have a symmetrical cross section inclined at 45 °, and the groove depth changes at the same angle as the inclined angle θ with respect to the mounting surface in the longitudinal direction. (F) In the polishing step, the rake face is formed by polishing and removing the second ridge line portion in parallel with the mounting surface of the holder .

  A second invention is characterized in that, in the diamond cutting member manufacturing method of the first invention, in the fixing step, the artificial diamond is integrally bonded to the V-shaped groove of the holder by an active metal braze. To do.

A third invention is the method of manufacturing a diamond cutting member according to the first or second invention, wherein (a) the holder is a shank, and (b) the diamond cutting member has the artificial diamond at the tip of the shank. It is a diamond tool fixed integrally.

In the method for manufacturing a diamond cutting member according to the first aspect of the present invention, the first ridge line portion of the hexahedral hexagonal diamond is fitted into a V-shaped groove having a right cross section provided in the holder, and a pair of side surfaces adjacent to the first ridge line. Are positioned so as to be in close contact with the pair of wall surfaces of the V-shaped groove, and are integrally fixed, and the second ridge line portion at a diagonal position with respect to the first ridge line is polished and removed to form a rake face. Since the artificial diamond is stably held in a fixed posture with high accuracy with respect to the holder, the rake face can be polished with high accuracy, and it is not necessary to polish and remove the first ridge line portion. And manufacturing costs are reduced. Therefore, according to this manufacturing method, the inclined surfaces rake surface inclined at a predetermined inclination angle θ in a range in the longitudinal direction from the {110} plane of 5 ° to 30 ° to the {111} plane side of the edge line The diamond cutting member provided as can be easily and inexpensively manufactured with high accuracy.

In addition, since the diamond cutting member manufactured in this way is provided with a rake face in the diagonal direction of hexagonal artificial diamond, the number of times that the rake face and the like can be continuously polished is increased, and the artificial diamond is effectively used. The tool life is further improved.
Further, the rake face is inclined at a predetermined inclination angle θ within a range of 5 ° to 30 ° from the {110} plane to the {111} plane side as it goes toward the cutting edge provided at one end in the longitudinal direction of the second ridge line. Therefore, the hole hole perpendicular to the {110} plane is inclined in the direction opposite to the cutting edge in accordance with the inclination angle θ, and the chips formed by the cutting edge do not easily enter the hole hole. Become. In particular, since the inclination angle θ is 5 ° or more, the intrusion of chips into the hole is effectively suppressed, the deterioration of the tool life due to the generation of the constituent cutting edge is well prevented, and the wear resistance is excellent. The tool life is significantly improved in combination with the characteristics. Further, since the inclination angle θ is 30 ° or less, it is before the {111} plane is reached, the rake surface can be polished, and the shape accuracy of the cutting edge can be improved by generating scratch-like wrinkles. Damage is suppressed. That is, since mechanical polishing is almost impossible in the vicinity of the {111} plane, it is difficult to form a sharp cutting edge or a cutting edge having a predetermined shape such as an arc. Incidentally, the {111} plane is obtained when the inclination angle θ≈35 ° 36 ′.
Further, the pair of wall surfaces of the V-shaped groove have a symmetric cross-sectional shape inclined at 45 °, and the groove depth changes at the same angle as the inclination angle θ with respect to the mounting surface in the longitudinal direction. Since it is inclined, it is only necessary to polish and remove the second ridge line portion in parallel with the mounting surface of the holder in the polishing process, and the rake face can be easily polished with higher accuracy.

Since the 2nd invention-the 3rd invention are subordinate to the 1st invention, the same operation effect as the 1st invention is obtained. In addition, in the second invention, the artificial diamond is integrally bonded to the V-shaped groove of the holder by the active metal brazing, but since a large bonding area is obtained compared to a single flat surface, excellent bonding is achieved. together can be bonded with strength, can be attached to the artificial diamond even for relatively small mounting portion with sufficient bonding strength, even small diamond cutting member can not be sufficient attachment portion Ru can be preferably manufactured.

  The diamond cutting member is a diamond cutting tool in which an artificial diamond is directly bonded to a shank, or a diamond tip that is bonded to a predetermined base metal and attached to a cutting tool or other cutting tool. Artificial diamonds are not only cubes or cuboids as shown in FIG. 9 (a), but also have chamfered planes at the corners of those cubes and cuboids as shown in FIG. 9 (b). Things can be used.

  The rake face provided by polishing and removing the ridge line portion of the artificial diamond is 5 ° to 30 ° from the {110} face to the {111} face side toward the cutting edge side provided at one end in the longitudinal direction of the ridge line. Although it is inclined at a predetermined inclination angle θ within the range, it is desirable that the inclination angle θ be in the range of 5 ° to 20 ° in order to obtain excellent processing accuracy such as mirror finishing. . When the wear resistance is more important than the processing accuracy, it is desirable that the inclination angle θ be in the range of 15 ° to 30 ° so as to be closer to the {111} plane. For polishing the rake face, a diamond polishing technique such as a Skyf disk is suitably used. In this specification, a surface that is inclined from the {110} plane to the {111} plane side at an inclination angle θ is expressed as “{110} + θ”.

The inclination angle θ is an angle between the ridge line of the artificial diamond and the rake face, specifically, a bisector of the angle formed by the direction of 45 ° from each side face of the ridge line, that is, an angle formed by both side faces. If the rake face is provided so as to spread to both sides of the ridge line symmetrically with respect to the ridge line, the angle between the center line of the rake face and the ridge line is is there. Therefore, in this case, a rake face is formed perpendicular to the center plane connecting the original ridge line and the center line of the rake face, but is slightly inclined from the direction perpendicular to the center plane (for example, about ± 5 °). In other words, a rake face may be provided that is slightly asymmetric with respect to the ridgeline . The V- shaped groove does not necessarily have a strictly symmetrical cross section, and the cross sectional shape may be inclined within a range of about ± 5 °.

  A cemented carbide is preferably used as the material of the holder, but other metal materials such as molybdenum may be employed. When adhering with an active metal braze, it is necessary to adopt one having a thermal expansion coefficient substantially the same as or smaller than that of artificial diamond so that it does not peel off due to a temperature change after adhesion. In the case of a cemented carbide holder, it can be molded and sintered with a V-shaped groove, but it can also be provided later by grinding or the like. In order to avoid interference between the bottom of the V-shaped groove and the ridgeline of the artificial diamond, a clearance groove having a rectangular cross section or an arc cross section is provided on the bottom of the V-shaped groove, or the ridgeline portion of the artificial diamond is polished and removed with a grindstone or the like. It is desirable. The polishing in this case only needs to remove the ridge line portion, and since accuracy is not required, it can be easily removed with a diamond grindstone or the like.

As a means for fixedly artificial diamond holder, it is desirable to bond directly the synthetic diamond against retainer using an active metal brazing, when the first shot Ming implementation, other bonding techniques and machines It is also possible to adopt a typical fixing means.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a three-side view showing a diamond cutting tool 50 according to an embodiment of the present invention, in which (a) is a front view, (b) is a plan view, and (c) is a left side view of (b). It is the figure which looked at 50 from the front end side. The diamond cutting tool 50 is an artificial diamond (polished product) 52 polished to a predetermined shape using the rectangular parallelepiped artificial diamond 10 as a raw material, and is integrally fixed to the tip of a cemented carbide shank 54. is there. As shown in FIG. 2, the shank 54 is provided integrally with a rectangular parallelepiped main body portion 56 and the front end side of the main body portion 56, and has a substantially triangular shape in a plan view of (b). The main body 56 is provided with two bolt holes 60 for fixing to a tool post such as a lathe using bolts. Further, a V-shaped groove 62 is provided at the center of the flat upper surface (mounting surface) of the mounting portion 58 in parallel with the front-rear direction of the shank 54 (the left-right direction in FIGS. 2A and 2B). As shown in FIG. 1, an artificial diamond 10 (hereinafter referred to as diamond material 10) before being polished is fixed. In the present embodiment, a diamond material 10 having a square cross section (or a cube) having a square cross section is used, and polishing is performed in a state where the diamond material 10 is integrally fixed to the shank 54. Thus, the artificial diamond 52 having the rake face 70 or the like is obtained. (A) to (c) in FIGS. 2 and 3 correspond to (a) to (c) in FIG. 1, respectively, (a) is a front view, (b) is a plan view, and (c) is a plan view. It is a left view of (b). The diamond tool 50 is a diamond cutting member, and the shank 54 is equivalent to a holder.

  The V-shaped groove 62 is provided so that the pair of wall surfaces 64 and 66 have a symmetrical right-angle cross-sectional shape inclined at about 45 ° with respect to the upper surface of the shank 54, and the longitudinal direction of the V-shaped groove 62 That is, in the front-rear direction of the shank 54, it is inclined at a predetermined inclination angle θ with respect to the upper surface of the shank 54 so that the groove depth increases toward the rear side (the right direction in FIGS. 2A and 2B). It has been made. As shown in FIG. 3, the diamond material 10 has a regular quadrangular prism-shaped first ridge line 13a portion fitted in the V-shaped groove 62, and a pair of side surfaces 12a, 12b adjacent to the first ridge line 13a. Are in close contact with the pair of wall surfaces 64 and 66 of the V-shaped groove 62, and the rear end surface 12 c is positioned so as to contact the back surface 68 of the V-shaped groove 62 and is integrated with the mounting portion 58 of the shank 54. Is fixed. The V-shaped groove 62 can be provided at the stage of molding the cemented carbide shank 54, but can also be formed by grinding after sintering. You may make it perform finish grinding etc. so that a pair of wall surfaces 64 and 66 may have predetermined surface precision. The process of preparing the shank 54 having such a V-shaped groove 62 is a holder manufacturing process.

  Here, in order to avoid interference between the bottom of the V-shaped groove 62 and the first ridge line 13a of the diamond material 10, the ridge line 13a is removed by grinding with a grindstone or the like as shown in FIG. 3 (d-1). (D-2), a relief groove 62s having a rectangular cross section or the like is provided at the bottom of the V-shaped groove 62. The polishing of the first ridge line 13a in this case only needs to remove the ridge line portion, and since accuracy is not required, it can be easily removed with a diamond grindstone or the like. The escape groove 62s may be formed by roughing or the like. As a result, the pair of side surfaces 12 a and 12 b of the diamond material 10 can be reliably brought into close contact with the pair of wall surfaces 64 and 66 of the V-shaped groove 62, and the diamond material 10 can be highly accurately attached to the shank 54. Positioned in a fixed posture.

  The diamond material 10 is integrally fixed to the mounting portion 58 of the shank 54 by integrally bonding the pair of side surfaces 12a and 12b to the pair of wall surfaces 64 and 66 of the V-shaped groove 62 by active metal brazing. Established. The active metal brazing is a silver brazing containing an active metal such as titanium (Ti) or chromium (Cr) at a ratio of about 2 to 4%, and the diamond material 10 is about 800 to 1000 ° C. in a deoxygenated atmosphere. By heating up to a thickness, an active metal film such as titanium or chromium is formed on the surfaces of the side surfaces 12 a and 12 b (metallized), and the side surfaces 12 a and 12 b are made of silver brazing containing silver and copper into the wall surfaces 64 of the V-shaped grooves 62. , 66 directly. In that case, the first ridge 13a is removed by grinding with a grindstone or the like as shown in FIG. 3 (d-1), or the relief groove is formed at the bottom of the V-shaped groove 62 as shown in FIG. 3 (d-2). Since 62s is provided, the side surfaces 12a and 12b and the wall surfaces 64 and 66 are reliably brought into close contact with each other, so that a sufficient bonding area is secured and high bonding strength is obtained. Thus, the process of integrally bonding the diamond material 10 to the V-shaped groove 62 by the active metal brazing is a fixing process.

  Then, with the diamond material 10 integrally fixed to the shank 54 in a predetermined posture as described above, the diamond material 10 is subjected to a polishing process by a diamond polishing technique such as a Skyf disk, thereby scooping. The artificial diamond 52 having the surface 70 and the like is used. That is, for example, as shown in FIG. 4, the shank 54 is held parallel to the substantially horizontal polishing surface 82 of the diamond polishing disk 80 that is rotationally driven around the center line O and in the opposite direction. By pressing the second ridge line 13b diagonally against the ridge line 13a against the polishing surface 82, the second ridge line 13b is removed by polishing parallel to the upper surface of the shank 54, and the original second ridge line 13b is removed. Thus, a rake face 70 inclined at the inclination angle θ is formed. In the present embodiment, a part of the second ridge line 13b remains, but depending on the length dimension and thickness of the diamond material 10, a rake face 70 may be provided by polishing until the second ridge line 13b is completely eliminated. Also good. The diamond material 10 has a rotational direction (tangential direction) of the polishing surface 82 and the second ridge line 13b in a plan view seen from above in FIG. 4A so that the second ridge line 13b can be efficiently polished and removed. Are pressed against the polishing surface 80 in a posture of being substantially parallel and polished from the tip side. Since the diamond material 10 of the present embodiment is a quadrangular prism with a square cross section, the second ridge line 13b is located immediately above the first ridge line 13a (just below in the polished state in FIG. 4A). The posture at the time of polishing by pressing the two ridge lines 13b against the polishing surface 82 is stabilized. 4A is a view showing a state where the shank 54 is held in the upside down direction and polishing is performed, and in FIG. 4B and FIG. 4C, the rake face 70 is formed by the polishing process. It is the top view and left view of a state.

  FIG. 5 is a diagram showing the diamond material 10 alone. (A) is a state before the polishing process is performed, and the second ridge line 13b is removed by polishing at an inclination angle θ as shown in (b). As a result, a rake face 70 shown in (c) is formed. In that case, since all the ridgelines of the diamond material 10 are represented by {110} planes, the rake face 70 is inclined from the {110} plane by the same angle as the inclination angle θ from the {111} plane direction. In this embodiment, the inclination angle θ is set to a predetermined value within the range of 5 ° to 30 °. In other words, the inclination angle θ of the V-shaped groove 62 is determined in accordance with the inclination angle θ of the rake face 70 from the {110} plane.

  As shown in FIG. 1, the diamond material 10 is also provided with a front flank 72 inclined at a predetermined inclination angle φ with respect to the front end face 12 d (see FIG. 3). A pair of lateral flank surfaces 74 and 76 are provided on both sides, and a cutting edge 78 is provided at the tip of the rake face 70 in the inclined direction and intersects the front flank surface 72. The inclination angle φ of the front flank 72 is minus (−) in the direction in which the flank increases, the rake angle of the rake face 70 is a °, and the rake angle of the front flank 72 is b °. It is set to a negative angle obtained by adding the rake angle a ° and the relief angle b ° to θ, and is set to about − (θ + 5 ° to 10 °), for example. The front flank 72 is represented by {100} −φ because the front end face 12d is a {100} plane. The pair of lateral flank surfaces 74 and 76 are substantially intersected at the front end side, and the ridge line forms a front flank surface 72, and the cutting edge 78 includes a rake surface 70 and a pair of lateral flank surfaces 74 and 76. Are made up of vertices that intersect. In this way, the process of polishing the rake face 70, the front flank 72, and the side flank 74, 76 is a polishing process. As a result, the diamond cutting tool 50 including the artificial diamond 52 having a predetermined shape as shown in FIG. Is obtained.

Thus, in this embodiment, the first ridge line 13a portion of the square columnar diamond material 10 is inserted into the V-shaped groove 62 provided in the shank 54 and having a right-angle cross section, and a pair of side surfaces adjacent to the first ridge line 13a. 12a and 12b are positioned and fixed integrally so as to be in close contact with the pair of wall surfaces 64 and 66 of the V-shaped groove 62, and the second ridge line 13b at a diagonal position with respect to the first ridge line 13a is polished. Since the rake face 70 is formed by removal, the diamond material 10 is stably held in a fixed posture with high accuracy with respect to the shank 54, and the rake face 70 can be polished with high accuracy. Moreover, since it is not necessary to polish and remove the first ridge line 13a, manufacturing time and manufacturing cost are reduced. Thus, the diamond tool 50 which is provided inclined surface inclined at a {110} a predetermined inclination angle to the {111} plane side from the surface θ in the longitudinal direction of the second ridgeline 13 b as a rake face 70, simply and inexpensively high It can be manufactured with accuracy.

  Further, since the diamond cutting tool 50 manufactured in this way is provided with the rake face 70 in the diagonal direction of the square prismatic diamond material 10, the number of times that the rake face 70 and the like can be continuously used after being repolished increases. The artificial diamond 52 can be effectively used and the tool life is further improved.

  Further, in this embodiment, the diamond material 10 is integrally bonded to the V-shaped groove 62 of the shank 54 by the active metal brazing, but it is excellent because a large bonding area is obtained as compared with a single flat surface. In addition to being able to bond with adhesive strength, the diamond material 10 can be attached to a relatively small attachment portion 58 with sufficient adhesion strength, and the present invention is also suitably applied when the attachment portion 58 cannot be secured sufficiently.

  Further, in the present embodiment, the rake face 70 is in the range of 5 ° to 30 ° from the {110} plane to the {111} plane as it goes toward the cutting edge 78 provided at one end in the longitudinal direction of the second ridge line 13b. Since the hole is inclined at a predetermined inclination angle θ, a hole that is perpendicular to the {110} plane is inclined in a direction opposite to the cutting edge 78 according to the inclination angle θ, and is formed by the cutting edge 78. Chips are less likely to enter the hole. In particular, since the inclination angle θ is 5 ° or more, the intrusion of chips into the hole is effectively suppressed, the deterioration of the tool life due to the generation of the constituent cutting edge is well prevented, and the wear resistance is excellent. The tool life is significantly improved in combination with the characteristics. Further, since the inclination angle θ is 30 ° or less, the cutting edge is 5 ° or more before the {111} plane, the rake face 70 can be polished, and scratches are generated. It is suppressed that the shape accuracy of 78 is impaired.

  Here, in this embodiment, the inclination angle θ is set to a predetermined value within a range of 5 ° to 30 °. However, when excellent machining accuracy such as mirror surface machining is required, sharp and high-precision cutting is performed. In order to obtain the blade shape, it is desirable to set the inclination angle θ within the range of 5 ° to 20 °, and further within the range of 5 ° to 15 °. In addition, when wear resistance is required rather than processing accuracy, the inclination angle θ is in the range of 15 ° to 30 °, and further 20 ° to be closer to the {111} plane and increase the hardness. It is desirable to set within a range of 30 °.

  Further, in this embodiment, the pair of wall surfaces 64 and 66 of the V-shaped groove 62 have a symmetric cross-sectional shape that is inclined at 45 °, and the groove depth changes at an inclination angle θ in the longitudinal direction. In the polishing step, the shank 54 may be held in parallel with the polishing surface 82 and the second ridge 13b portion may be removed by polishing as shown in FIG. It can be easily polished with precision.

On the other hand, the diamond cutting tool 50 of this example in which the rake face 70 is {110} + 20 ° and the front flank 72 is {100} −25 ° at the inclination angle θ = 20 °, the inclination angle φ = −25 °, As shown in FIG. 10, a conventional diamond cutting tool in which the {100} face of the diamond material 10 is used as the rake face 20 and the front flank 22 is {100} −5 ° is prepared. As shown in Fig. 7, the end face of the aluminum alloy that is rotationally driven around the axis was cut and the cutting distance until the initial wear was examined. The result shown in Fig. 7 was obtained.
"Processing conditions"
Work material: Aluminum alloy (JIS-A5056)
Cutting form: End face cutting Cutting speed: 300 m / min
Feed (radial feed): 0.01 mm / rev

  As is apparent from the results shown in FIG. 7, according to the product of the present invention, cutting of 25 km or more is required, and the tool life is significantly improved as compared with the conventional product. That is, the initial wear is different from the re-polishing life that requires re-polishing in a state in which predetermined fine wear occurs on the cutting edge 78 and mirror surface machining is possible, but the cutting distance to the initial wear is different. Is roughly proportional to the cutting distance until the re-polishing life is reached, so it is possible to compare and judge the re-polishing life based on the cutting distance until the initial wear, and further the tool life including continuous use by re-polishing, It is considered that the tool life is 2.5 times longer than that of conventional products.

  Further, FIG. 8 shows the case where the tilt angle θ = 3 °, that is, when cutting is performed on an aluminum alloy and a cemented carbide using a diamond tool 50 having a rake face 70 of {110} + 3 °. The figure shows the result of the component analysis of the artificial diamond 50 after re-polishing the rake face 70 and the like after reaching the re-polishing life with the component cutting edge, and the aluminum (which should not exist in the original diamond bite 50) It can be seen that a large amount of Al) or tungsten (W) remains regardless of repolishing. Therefore, even after re-polishing, it is considered that the constituent cutting edges are generated early due to these aluminum and tungsten, and the tool life is significantly hindered. Note that when the inclination angle θ is 5 °, almost no entry of chips such as aluminum or tungsten is observed, and almost no component cutting edge is generated.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one embodiment to the last, and this invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the diamond bite which is one Example of this invention, (a) is a front view, (b) is a top view, (c) is a left view of (b). FIG. 2 is a diagram showing the shank of the diamond tool of FIG. 1 alone, where (a) is a front view, (b) is a plan view, and (c) is a left side view of (b). FIG. 3 is a diagram showing a state in which an artificial diamond material is integrally fixed to the shank of FIG. 2, (a) is a front view, (b) is a plan view, (c) is a left side view of (b), ( d-1) and (d-2) are cross-sectional views of a portion where a diamond material is fitted into a V-shaped groove. FIGS. 4A and 4B are diagrams for explaining a polishing process for forming a rake face by subjecting the diamond material of FIG. 3 to polishing, wherein FIG. 3A is a front view at the time of polishing, and FIG. (c) is a left side view of (b). It is a perspective view which shows independently the process in which the rake face is formed in a diamond raw material by the grinding | polishing process of FIG. It is a schematic perspective view explaining the end surface cutting process at the time of investigating a tool life using this invention product and a conventional product. It is a figure which compares the test result of FIG. 6 with this invention product and a conventional product. It is a figure which shows the result of having analyzed the component of the artificial diamond with the electron microscope, after performing predetermined | prescribed cutting with the diamond bit which made the rake face {110} +3 degrees, and re-polishing. FIG. 2 is a diagram for explaining a basic shape of an artificial diamond, where (a) is a perspective view in the case of a rectangular parallelepiped shape, and (b) is a perspective view in the case of having a chamfered plane at a corner of the rectangular parallelepiped in (a). It is a figure explaining the usage condition in the case of cutting using one of the {100} faces of the artificial diamond of FIG. 9 as a rake face as it is, (a) is a perspective view of the artificial diamond subjected to a predetermined polishing process. FIG. 2B is a perspective view showing an example when used for turning. FIG. 10 is a diagram for explaining a usage mode when one ridge line of the artificial diamond of FIG. 9 is polished and cutting is performed using the {110} plane obtained by the polishing as a rake face; (a) rake A perspective view of the artificial diamond before processing the surface, (b) is a perspective view showing a portion to be polished and removed to form a rake surface and an adhesive surface, and (c) is a perspective view where the dotted line portion of (b) is removed (D) is a perspective view of the artificial diamond of (c) attached to a holder such as a shank through an adhesive surface. FIGS. 3A and 3B are diagrams for explaining three crystal planes {111}, {110}, and {100} of diamond, the left diagram shows a three-dimensional model showing the position of the crystal plane, and the right diagram shows the arrangement of atoms in each crystal plane. It is.

Explanation of symbols

  10: Artificial diamond (material) 12a, 12b: Side surface 13a: First ridge line 13b: Second ridge line 50: Diamond tool (diamond cutting member) 52: Artificial diamond (after polishing) 54: Shank (holding tool) 62: V Gutter 64, 66: Wall surface 70: Rake face 78: Cutting edge θ: Inclination angle

Claims (3)

Cutting diamond and rake face are basically made of hexagonal single crystal artificial diamond having six {100} faces, and diamond cutting is used for cutting by being integrally fixed to a predetermined holder. A method for manufacturing a member, comprising:
A holder manufacturing process for preparing a holder provided with a V-shaped groove having a right-angle cross section;
The hexagonal-shaped artificial diamond first ridge line portion is fitted into the V-shaped groove, and the pair of side surfaces adjacent to the first ridge line are positioned so as to be in close contact with the pair of wall surfaces of the V-shaped groove, respectively. A fixing process to fix to
A polishing step of polishing and removing a second ridge line portion at a diagonal position with respect to the first ridge line fitted in the V-shaped groove to form a rake face;
It has a, and,
The rake face is inclined at a predetermined inclination angle θ within a range of 5 ° to 30 ° from the {110} plane to the {111} plane side toward the cutting edge provided at one end in the longitudinal direction of the second ridge line. Have been
The V-shaped groove is provided on a flat mounting surface of the holder so that a pair of wall surfaces each have a symmetrical cross-sectional shape inclined at 45 °, and the inclination angle with respect to the mounting surface in the longitudinal direction. It is inclined so that the groove depth changes at the same angle as θ,
In the polishing step, the rake face is formed by polishing and removing the second ridge line portion in parallel with the mounting surface of the holder . In claim 1,
In the fixing step, the artificial diamond is integrally bonded to the V-shaped groove of the holder by an active metal braze. In claim 1 or 2 ,
The holder is a shank,
The method for producing a diamond cutting member, wherein the diamond cutting member is a diamond cutting tool in which the artificial diamond is integrally fixed to a tip portion of the shank.

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