JP6705910B2 - Electrodeposited diamond dresser for forming screw-shaped grindstone for gear grinding and manufacturing method thereof - Google Patents

Description

The present invention relates to an electrodeposited diamond dresser for forming a screw-shaped grindstone for grinding a gear and a method for manufacturing the same.

A grindstone for grinding a gear has a screw shape (worm type), and a dresser for forming a screw shape is required to have a high degree of precision.
The dresser described in Patent Document 1 includes two tapered working surfaces for dressing the flank surfaces of the threaded grindstone and an outer peripheral working surface for dressing the roots of the threads of the threaded grindstone. Small-diameter diamond abrasive grains are provided on these working surfaces.

According to Patent Document 1 as a conventional technique, a pair of dressers are arranged on a rotating shaft with a predetermined distance therebetween, and each of the dressers has two tapered action surfaces that are brought into contact with different flank surfaces of a worm wheel. To use.

International Publication No. 2007/000831

However, in Patent Document 1, in order to improve the dressing accuracy, the width of the outer peripheral working surface formed by the front and back tapered surfaces of each dresser is narrowed. When the flank surface and the valley bottom portion of the screw of the worm type grindstone are dressed with this narrow outer peripheral working surface, there is a problem that a large contact load causes the small-diameter diamond abrasive particles to fall off and shorten the life as a dresser.

The present invention has been made in view of the above conventional problems, and provides an electrodeposition diamond dresser for forming a threaded grinding wheel for gear grinding, which enables highly accurate dressing and has a long life.

In order to solve the above-mentioned problems, the structural feature of the invention according to claim 1 is that in the electrodeposition diamond dresser for forming a screw-shaped grindstone for gear grinding, both sides of the outer peripheral portion are thinned toward the outer peripheral surface. A wheel made of heat-treated steel that is formed into a disk shape having a tapered surface and is driven to rotate around a rotation axis, and extends in a belt shape with a predetermined width on the outer peripheral edge of the tapered surface, and has a plurality of small particle sizes. A diamond abrasive grain layer in which diamond abrasive grains are plated with a plating layer, a plurality of mounting grooves having two inner wall surfaces formed in the outer peripheral surface of the wheel in parallel with the rotation axis and forming a predetermined angle, and It is formed in a grain larger than the small-diameter diamond abrasive grain, has an attachment crystal plane equal to the predetermined angle, and when the attachment crystal plane is attached to both wall surfaces in the groove, it is parallel to the outer peripheral surface of the wheel. A polyhedral single-crystal diamond abrasive grain that is a crystal that does not become a cleavage plane, each said polyhedral single-crystal diamond abrasive grain, said attachment crystal face is said groove inner wall surfaces of said attachment groove of said wheel The small-diameter diamond abrasive grains are plated on the outer peripheral surface of the wheel between the plurality of polyhedral single-crystal diamond abrasive grains on the outer peripheral surface of the wheel by the plating layer.
The outer peripheral surface of the wheel refers to the outer peripheral surface of the disc-shaped wheel when the mounting groove is not formed. Further, since the outer peripheral surface of the wheel is a curved surface, it cannot be originally expressed that it is parallel to the cleavage plane that is a flat surface. However, since the crystal plane of the polyhedral single crystal diamond abrasive grains is minute with respect to the outer peripheral surface of the wheel, the outer peripheral surface of the wheel is grasped as a substantially flat surface in comparison with the crystal plane of the polyhedral single crystal diamond abrasive grains. You can. Therefore, in the claims and the specification of the present application, the outer peripheral surface of the wheel and the cleavage plane of the polyhedral single crystal diamond abrasive grain are described by using the expression “parallel”.
Originally, at the position facing the center of both wall surfaces in the groove, it means that the plane parallel to the "imaginary plane" in contact with the outer peripheral surface of the wheel is a crystal that does not become the cleavage plane of the polyhedral diamond abrasive grain. To do.

Conventionally, a wheel that becomes thinner toward the outer peripheral surface has a narrow outer peripheral surface due to the tapered surfaces provided on both sides of the outer peripheral portion, and the number of small-diameter diamond abrasive grains per unit area arranged on the outer peripheral surface is small. Few. Therefore, a dressing load is applied to the small-diameter diamond abrasive grains arranged on the outer peripheral surface. However, a plurality of large granular polyhedral single crystal diamond abrasive grains are plated on the outer peripheral surface of the wheel along the circumferential direction, and the polyhedral single crystal diamond abrasive grains mainly perform dressing when dressing. Therefore, the load applied to the diamond abrasive grain layer formed by the polyhedral single crystal diamond abrasive grains containing the small-diameter diamond abrasive grains is reduced, the small-diameter diamond abrasive grains are prevented from falling off, and the wheel itself is not damaged. It can be prevented and the life as a dresser can be extended.
Further, on the outer peripheral surface of the wheel, a plurality of mounting grooves are formed in parallel with the axis of rotation and having both inner walls of the groove forming a predetermined angle, and the polyhedral single crystal diamond abrasive grains are equal to the predetermined angle of both inner walls of the groove. The mounting crystal plane is plated on both wall surfaces in the groove so that the plane parallel to the outer peripheral surface of the wheel does not become a cleavage plane. Therefore, the polyhedral single-crystal diamond abrasive grains are hard to be crushed and firmly fixed to the wheel, so that the life of the dresser can be extended.

It is a figure which shows the electrodeposition diamond dresser for shaping|molding of embodiment which concerns on this invention seeing from a back surface side. It is a figure which shows the II-II cross section of the electrodeposition diamond dresser for shaping|molding in FIG. It is sectional drawing which expands and shows the taper surface in FIG. It is a figure which expands and shows the outer peripheral part in FIG. It is a partial enlarged view showing the outer peripheral surface of the electrodeposition diamond dresser for molding as seen from the front side. It is a partial enlarged view showing the outer peripheral surface of the electrodeposition diamond dresser for molding as seen from the side. It is a figure which shows the model of an octahedron single crystal diamond abrasive grain. It is a flowchart which shows the manufacturing procedure of the electrodeposition diamond dresser for shaping|molding. It is a partial enlarged view showing a process of forming a mounting groove. It is a figure which shows the process of apply|coating an adhesive agent to an attachment groove. It is a figure which shows the process which adhered the octahedral single crystal diamond abrasive grain to the attachment groove. It is a figure which shows the electroplating tank which forms an electroplating layer in a wheel. It is a figure which shows the process of making a diamond particle of small particle size contact a wheel. It is a figure which shows the process of forming an electroplating layer and removing a surplus small particle diameter diamond abrasive grain. It is a figure which shows the process of growing an electroplating layer. It is a figure explaining the state which dresses a thread-like grindstone. It is the figure which compared the durability of the dressing frequency of the conventional dresser and this dresser. It is a figure which shows the kind of crystal shape of a polyhedral diamond abrasive grain. It is a figure which shows the state which attaches a hexahedral single crystal diamond abrasive grain to the attachment groove of a wheel. It is a figure which shows the state which attaches the rhombic dodecahedron single crystal diamond abrasive grain to the attachment groove of a wheel. It is a figure which shows the state which attaches the single crystal diamond abrasive grain in which the crystal plane of an octahedron and the crystal plane of a hexahedron appeared to the mounting groove of a wheel. FIG. 3 is a diagram showing a state in which single-crystal diamond abrasive grains having a rhombic dodecahedron crystal face, an octahedron crystal face, and a hexahedral crystal face are attached to an attachment groove of a wheel. It is a figure which shows the state which attaches the single crystal diamond abrasive grain which the crystal plane of a rhombic dodecahedra and the crystal plane of an octahedron appeared to the attachment groove of a wheel.

(Embodiment)
Hereinafter, an embodiment of an electrodeposition diamond dresser for forming a thread grinding wheel for gear grinding according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the electrodeposition diamond dresser 1 for molding includes a wheel 2, a diamond abrasive grain layer 3 provided on the wheel 2, and an octahedral single crystal provided on an outer peripheral surface 22 of the wheel 2. And diamond abrasive grains 4.

(wheel)
As shown in FIGS. 1 and 2, the wheel 2 is, for example, a steel member, and is formed into a disk shape with two tapered surfaces 21 (front tapered surface 21f, back tapered surface 21b) that taper toward the outer periphery. Has been done. As the heat-treated steel member, for example, quenched or tempered steel (SUJ) is used. The front taper surface 21f continuously extends from the surface of the thick disk portion 23 provided in the central portion of the wheel 2 to the outer peripheral surface 22. The back taper surface 21b is an outer peripheral surface that is continuous from the back surface of the thick disk portion 23 provided in the central portion of the wheel 2 from the front surface of the step portion 24 in which a step is formed in the direction of decreasing the wall thickness. It extends to 22. The outer peripheral surface 22 is formed to have a narrow width in the direction along the rotation axis CL by the front taper surface 21f and the back taper surface 21b provided so as to become thinner toward the outer circumference (see FIGS. 3 and 4). ).
In the wheel 2, the side on which the front surface 21f where the diamond abrasive grain layer 3 is formed in a wide band shape with a predetermined width is formed is referred to as a front side, and the diamond abrasive grain layer 3 is narrower in width than the front taper surface 21f. The side on which the back taper surface 21b is formed is referred to as the back side. On the front taper surface 21f of the wheel 2, a front strip portion 25f having a predetermined width is formed on the outer peripheral edge portion 26 in a strip shape. Further, on the back taper surface 21b, a back strip portion 25b is formed on the outer peripheral edge portion 26 with a width narrower than that of the front strip portion 25f. A diamond abrasive grain layer 3 in which a plurality of small-diameter diamond abrasive grains 31 are plated with a plating layer described below is formed on the front strip portion 25f and the back strip portion 25b.

(Diamond abrasive layer)
As the small-diameter diamond abrasive grains 31 forming the diamond abrasive grain layer 3, for example, those having a grain size of #60/80 are used. The small-diameter diamond abrasive grains 31 are plated on the wheel 2 by the electroplating layer 32 formed by electroplating to form the diamond abrasive grain layer 3.

(Mounting groove)
As shown in FIG. 9, on the outer peripheral surface 22 of the wheel 2, both inner wall surfaces 51a, 51b of the groove facing each other form 110°, and the groove stripe 52 extends parallel to the rotational axis CL direction of the wheel 2. A plurality of grooves 5 (80 locations in this embodiment) are provided. One octahedral single crystal diamond abrasive grain 4 is fixed to each mounting groove 5. As shown in FIG. 7, the octahedral single crystal diamond abrasive grains 4 form a regular octahedron called an octahedron type and have a grain size of #16/18, for example. Both inner wall surfaces 51a and 51b of the mounting groove 5 shown in FIG. 9 are formed at a predetermined angle of 110°. As shown in FIG. 11, on both wall surfaces 51a and 51b in the groove, two base end side mirror indexes {1, 1, 1 which are adjacent to each other at an angle of 110° of the octahedral single crystal diamond abrasive grains 4 are formed. } Faces M1 and M2 are attached together. (Here, the two base end side mirror index {1,1,1} planes are the eight mirror index {1,1,1} planes of the octahedral single crystal diamond abrasive grain 4 of the wheel 2). The two mirror index {1,1,1} planes that are arranged on the rotation axis CL side (mounting groove 5 side) and are bonded to both inner wall surfaces 51a and 51b of the mounting groove 5 are referred to. One of the base end side mirror index {1,1,1} planes corresponds to the "mounting crystal plane".) Further, the head side mirror index {1,1,1} planes are mounted as mounting crystal planes. The two mirror index {1,1,1} faces arranged on the opposite side of the mounting groove 5 facing the two base end side mirror index {1,1,1} faces located on the groove 5 side I will say.

In this case, when the octahedral single crystal diamond abrasive grain 4 is attached, the attachment groove 5 has two base end side mirror indices of the octahedral single crystal diamond abrasive grain 4 as shown in FIGS. 7 and 9. 1,1,1} planes M1, M2 and two base end side mirror index {1,1,1} planes M1, M2 and two head side mirror index {1,1,1} planes facing each other The radii of the wheel 2 are the apices 42, 43 where H1 and H2 intersect (the apices 42 are represented by coordinates (1, 0, 0) and the apices 43 are represented by coordinates (-1, 0, 0)). In the direction, it is formed so that it can be arranged at a position closer to the rotation axis CL side than the outer peripheral surface 22 (see FIGS. 7 and 11).

The inner wall surfaces 51a and 51b of the mounting groove 5 and the two base end side mirror index {1,1,1} surfaces M1 and M2 of the octahedral single crystal diamond abrasive grain 4 which are adjacent to each other at 110° are bonded to each other. It is adhered by the agent 6. As the adhesive 6, for example, an epoxy resin-based non-conductive adhesive is used.

(Octahedron single crystal diamond grain)
The octahedral single-crystal diamond abrasive grains 4 are plated on the outer peripheral surface 22 of the wheel 2 together with the small-diameter diamond abrasive grains 31 by the electroplating layer 32 (see FIGS. 5, 6 and 15). In this case, the electroplating layer 32 has two base end side mirror index {1,1,1} planes M1, M2 and two head side mirror index {1,1,1} planes H1, H2. The octahedral single-crystal diamond abrasive grains 4 are coated on the outer peripheral surface 22 to cover the intersecting top portions 42 and 43 (see FIGS. 5, 6, 7, and 15). In this way, the octahedral single crystal diamond abrasive grains 4 are firmly attached to the outer peripheral surface 22 of the wheel 2 by the electroplating layer 32.
The octahedral single crystal diamond abrasive grains 4 shown in FIGS. 3 to 6 are not in the shape of the octahedral crystal as they are, but are aligned with the blade surfaces of the small-diameter diamond abrasive grains 31 arranged in the diamond abrasive grain layer 3. It has a shape that has been molded. The cleavage plane CS is a plane in which a crystal is easily broken in a specific direction, and in the case of an octahedral single crystal diamond 4, a plane parallel to the {1,1,1} plane (also in this case, Miller index). The {1,1,1} plane). As shown in FIGS. 5 and 6, the octahedron single crystal diamond abrasive grain 4 has a plane mirror index {1, 1, 1} plane parallel to the cleavage plane CS on the outer surface. When processing a portion other than the cleavage plane CS, diamonds are rubbed together and polished. Small-diameter diamond abrasive grains 31 are also arranged among a plurality of octahedral single-crystal diamond abrasive grains 4 arranged on the outer peripheral surface 22 of the wheel 2. The octahedral single crystal diamond abrasive grain 4 is an imaginary plane that is in contact with the outer peripheral surface 22 of the wheel 2 at the center position where the octahedral single crystal diamond abrasive grain 4 is attached, assuming that the attachment groove 5 is not formed. , The cleavage plane CS of the octahedral single crystal diamond abrasive grain 4 is positioned not to be parallel but to intersect at an angle of 35°.

At the center of the wheel 2, a center hole 27 is provided which is fitted into a centering boss protruding at the shaft ends of the drive shafts SFr, SF1 (see FIG. 16). Around the center hole 27, three female screw holes 28 having female screws and three bolt holes 29 through which bolts are inserted are formed (see FIGS. 1 and 2).

(Procedure of manufacturing method)
Next, a method for manufacturing the electrodeposition diamond dresser 1 for forming a screw-shaped grindstone for gear grinding will be described below with reference to FIGS.
The wheel 2 is formed into a disc shape, for example, by a grinding machine (wheel forming step/step 101 (hereinafter, step is abbreviated as “S”)) (see FIG. 8 ). The wheel 2 is formed of a heat-treated steel member, and is formed on the front taper surface 21f, the back taper surface 21b, and the front and back surfaces of the outer peripheral portion so as to become thinner toward the outer circumference. The front taper surface 21f is formed so as to extend continuously from the surface of the thick disk portion 23 provided in the central portion of the wheel 2 to the outer peripheral surface 22. A thick-walled disc portion 23 is formed in the central portion on the back side of the wheel 2, and a step portion 24 is formed on the outer peripheral portion of the thick-walled disc portion 23 in which a step is formed in the direction in which the thickness is reduced. The back taper surface 21b is formed so as to extend continuously to the outer peripheral surface 22 from the surface of the thinly formed end of the step portion 24.

A central hole 27 through which the drive shafts SFr and SFl (FIG. 16) penetrate is provided at the center of the wheel 2. Around the center hole 27, three female screw holes 28 in which female screws are screwed and three bolt holes 29 into which bolts are inserted are provided (see FIG. 1 ).

Next, the mounting groove 5 is formed on the outer peripheral surface 22 of the wheel 2 by, for example, wire working (mounting groove forming step S102) (see FIG. 9). As shown in FIGS. 7 and 9, the mounting groove 5 has groove grooves 52 extending along the direction of the rotation axis CL of the wheel 2 and both inner wall surfaces 51a and 51b of the groove facing each other form an angle of 110°. , Two octagonal single-crystal diamond abrasive grains 4 attached at an angle of 110° and adjacent to each other at a ridge 41 on the base end side mirror index {1,1,1} planes M1, M2 spaced apart from each other The two top portions 42 and 43 are formed to have a depth dimension that can be arranged at a position closer to the rotation axis CL side than the outer peripheral surface 22 in the radial direction of the wheel 2 (see FIGS. 9 and 11). A plurality of mounting grooves 5 are formed on the outer peripheral surface 22 of the wheel 2 at predetermined intervals (80 locations in this embodiment).

Next, the octahedral single crystal diamond abrasive grains 4 are adhered to both inner wall surfaces 51a and 51b of the attachment groove 5 (octahedral single crystal diamond abrasive grain adhering step S103) (see FIGS. 10 and 11). In this case, two base end side mirror index {1,1,1} planes M1, M2 that are adjacent to each other at the ridge line 41 at an angle of 110° in the octahedral single crystal diamond abrasive grain 4 are bonded by the adhesive 6. It adheres to both wall surfaces 51a and 51b in the groove. As the adhesive agent 6, for example, an epoxy resin adhesive agent can be used as the non-conductive adhesive agent.

Next, a plurality of small-diameter diamond abrasive grains 31 are brought into contact with the belt-shaped portions 25f, 25b on the tapered surface 21 of the wheel 2 and the outer peripheral surface 22 of the wheel 2 (small-diameter diamond abrasive grain contact step S104) ( (See FIG. 13). This contact is performed by bringing a plurality of small-diameter diamond abrasive grains 31 housed in a container (not shown) into contact with the tapered surface 21 and the outer peripheral surface 22.

Next, the wheel 2 to which the octahedral single-crystal diamond abrasive grains 4 are adhered and the small-diameter diamond abrasive grains 31 are in contact is provisionally plated by electroplating in a nickel solution (first electroplating step S105). (See FIGS. 12 and 14). The electroplating bath 7 contains, for example, a plating solution 71 in which boric acid, nickel sulfate, nickel chloride, etc. are mixed. A nickel electrode 72 is provided as an anode in the plating solution 71. Wheel 2 is assigned as the cathode. The wheel 2 is fastened to the flange portion 73a of the conductive support member 73 connected to the terminal of the cathode by a nut 74, and the wheel 2 has a bottom plate 75 and a bracket 76 made of vinyl chloride and has a masking member 77 made of rubber in a vertical direction. Being pinched from. By this electroplating, the electroplating layer 32 is formed between the small-diameter diamond abrasive grains 31 contacting the surface of the wheel 2 and the wheel 2, and the small-diameter diamond abrasive grains 31 are temporarily plated on the surface of the wheel 2. (See FIG. 14).

Next, the surplus small-diameter diamond abrasive grains 31 not temporarily applied to the surface of the wheel 2 are removed (excess small-diamond diamond abrasive removing step S106) (see FIG. 14). Thereby, the diamond abrasive grain layer 3 having a high shape accuracy can be formed as a single abrasive grain layer.

Next, the electroplating layer 32 is further formed on the wheel 2 from which the surplus small-diameter diamond abrasive grains 31 have been removed (second electroplating step S107) (see FIG. 15). By further growing and forming the electroplating layer 32, in the octahedral single crystal diamond abrasive grain 4, two base end side mirror index {1,1,1} planes M1, M2 and two base end portions are formed. An octahedron that covers the tops 42 and 43 where the side mirror index {1,1,1} planes M1, M2 and the two head side mirror index {1,1,1} planes H1, H2 that face each other intersect. The single crystal diamond abrasive grains 4 are plated on the outer peripheral surface 22. In this case, in the electroplating layer 32, the base end side of the octahedral single crystal diamond abrasive grains 4 (the side where the octahedral single crystal diamond abrasive grains 4 are fixed to the wheel 2) is firmly bonded to the outer peripheral surface 22 of the wheel 2. Put on the plate.

(Operation)
Next, a brief description will be given of a case of dressing a thread grinding wheel for gear grinding (hereinafter, referred to as a thread grinding wheel) W using the electrodeposition diamond dresser 1 for forming a thread grinding wheel for gear grinding in the present embodiment. To do.
First, as shown in FIG. 16, a forming electrodeposition diamond dresser 1 is provided by bolts B and the like at the opposite ends of the two coaxially arranged drive shafts SFr and SFl so that they cannot rotate relative to each other. The two forming electrodeposition diamond dressers 1 (1R, 1L) are arranged so that the front taper surfaces 21f provided with the diamond abrasive grain layer 3 face each other. The drive shafts SFr and SFl rotate by being transmitted with drive torque by a drive motor (not shown) via a speed reducer (not shown). The rotation speeds of the drive shafts SFr and SFl are configured to be changed to an arbitrary peripheral speed by a mechanism that switches the gear ratio in the reduction gear transmission. The two drive shafts SFr and SFl are incorporated into a contact/separation moving mechanism (not shown) that moves closer to and away from the rotation axis CL.

The threaded grindstone W, which is the object to be ground, is non-rotatably assembled to a rotary shaft (not shown) that can rotate at a peripheral speed different from that of the drive shafts SFr and SFl. The drive shafts SFr and SFl and the rotary shaft to which the screw-shaped grindstone W is assembled are incorporated in a not-shown notch movement mechanism (not shown) that enables them to approach and separate in parallel with each other. Further, the drive shafts SFr, SFl and the rotary shaft on which the screw-shaped grindstone W is assembled have a feed moving mechanism that allows relative movement in the axial direction in association with the rotation of the rotary shaft on which the screw-shaped grindstone W is assembled (Fig. (Not shown).

When performing dressing, for example, the peripheral speed of the threaded grindstone W is made lower than the peripheral speed of the electrodeposited diamond dresser 1 for molding, and the electrodeposited diamond dresser 1 for molding and the threaded grindstone W are contacted at a contact point. Rotate in opposite directions so that they rotate in the same tangential direction. Then, the side surfaces of the roots of the screw teeth of the threaded grindstone W (flank surfaces WF) are dressed by approaching them while adjusting the amount of cutting by the cutting movement mechanism. Then, the electrodeposition diamond forming dresser 1 for forming and the thread-shaped grindstone W are relatively moved in the axial direction by the feed moving mechanism in synchronization with the rotation of the thread-shaped grindstone W, and the flank surface WF of the thread-shaped grindstone W is moved. And the valley bottom WB is continuously dressed. In this case, the cutting amount of the two electroforming diamond dresser 1 for forming is synchronized by the notch moving mechanism, and the feed moving amount of the two electroforming diamond dresser 1 for forming is controlled by the respective flank surfaces WFr. , WFl according to the side profile.

In the dressing, when the outer peripheral surface 22 comes into contact with the flank surface WF or the valley bottom portion WB, an octahedron is mainly formed on the outer peripheral surface 22 that is narrowed by the front tapered surface 21f and the back tapered surface 21b provided on both sides of the outer peripheral portion. The single crystal diamond abrasive grains 4 dress. Therefore, highly accurate dressing can be performed in accordance with the shape of the finely threaded grindstone W. Since the plurality of octahedral single-crystal diamond abrasive grains 4 are arranged in the circumferential direction on the outer peripheral surface 22, the octahedral single-crystal diamond abrasive grains 4 mainly perform dressing, and the small-diameter diamond abrasive grains 4 are used. It is possible to prevent the falling of the wheel 31, and thus prevent the wheel 2 itself from being damaged.

(Comparison data with conventional)
As shown in FIG. 17, when dressing is performed using a conventional dresser and when dressing the dresser of the present embodiment in which octahedral single crystal diamond abrasive grains are arranged on the outer peripheral surface, conventional dressing is performed 900 times. In contrast to this, the electrodeposition diamond dresser 1 for molding of the present case could be dressed 1600 times or more, and the durability of about 1.8 times was recognized.

As is clear from the above description, the forming electrodeposition diamond dresser 1 for the screw grinding wheel for gear grinding according to the present embodiment faces the outer peripheral surface 22 in the forming electrodeposition diamond dresser 1 for the screw grinding wheel for gear grinding. Wheel 2 made of heat-treated steel, which is formed in a disk shape having a front taper surface 21f and a back taper surface 21b on both sides of the outer periphery so as to be thin and is driven to rotate around a rotation axis CL, and the front taper surface 21f. The outer peripheral surface of the wheel 2 and the diamond abrasive grain layer 3 extending in a strip shape with a predetermined width on the outer peripheral edge of the back taper surface 21b, and a plurality of small-diameter diamond abrasive grains 31 plated on the electroplating layer 32. 22 is formed in parallel with the rotation axis CL and has a plurality of mounting grooves 5 having inner wall surfaces 51a and 51b forming a predetermined angle, and a granular shape larger than the small-diameter diamond abrasive grains 31 and equal to the predetermined angle. It has two base end side Miller index planes M1 and M2 (attached crystal planes (octahedral crystal planes oc1 and oc2)), and two base end side Miller index planes M1 and M2 are formed on both wall surfaces 51a in the groove. When attached to 51b, the octahedral single crystal diamond abrasive grain 4 is a crystal whose plane parallel to the outer peripheral surface 22 of the wheel 2 does not become the cleavage plane CS, and each octahedral single crystal diamond abrasive grain 4 is Two base end side mirror index surfaces M1 and M2 are plated with electroplating layers 32 on both inner wall surfaces 51a and 51b of the mounting groove 5 of the wheel 2.

Conventionally, in the wheel 2 that becomes thinner toward the outer peripheral surface 22, the outer peripheral surface 22 is narrowed by the front taper surface 21f and the back taper surface 21b provided on both sides of the outer peripheral portion, and the small-diameter diamond grindstone per unit area is provided. The number of grains 31 is small. Therefore, a large dressing load is applied to the small-diameter diamond abrasive grains 31 arranged on the outer peripheral surface 22. However, a plurality of large granular octahedral single crystal diamond abrasive grains 4 are plated on the outer peripheral surface 22 of the wheel 2 along the circumferential direction, and the octahedral single crystal diamond abrasive grains 4 mainly perform dressing when dressing. To do. Therefore, the load applied to the diamond abrasive grain layer 3 by the octahedral single-crystal diamond abrasive grains 4 is reduced, the small-diameter diamond abrasive grains 31 are prevented from falling off, the damage of the wheel 2 itself is prevented, and the life as a dresser is reduced. Can be extended.
Further, on the outer peripheral surface 22 of the wheel 2, a plurality of mounting grooves 5 having inner wall surfaces 51a and 51b forming a predetermined angle of 110° are formed in parallel with the rotation axis CL, and the octahedral single crystal diamond abrasive grains 4 are formed. Are two base end side mirror index surfaces M1 and M2 that are equal to a predetermined angle 110° of both inner wall surfaces 51a and 51b of the groove, so that the surface parallel to the outer peripheral surface 22 of the wheel 2 is not the cleavage surface CS. It is plated on both inner wall surfaces 51a and 51b. Therefore, the octahedral single-crystal diamond abrasive grains 4 are hard to be crushed and firmly fixed to the wheel 2 so that the life as a dresser can be extended.

The octahedron single crystal diamond abrasive grain 4 forms a ridgeline at an angle of 110° in the octahedral single crystal diamond abrasive grain 4 on both inner wall surfaces 51a and 51b of the mounting groove 5 in which the groove line 52 is parallel to the rotation axis CL. It is strongly fixed at two base end side mirror index {1,1,1} planes M1, M2 as mounting crystal planes adjacent to each other at 41. Therefore, at the time of dressing, the force due to the dressing load applied to the octahedral single crystal diamond abrasive grains 4 from the circumferential direction and the radial direction is applied to both the groove inner wall surfaces 51a and 51b of the wheel 2, and the octahedral layer is formed by the plating layer 32. The single crystal diamond abrasive grains 4 are reliably plated. Thereby, the diamond abrasive grain layer 3 is prevented from being damaged and the life as a dresser can be extended.
The octahedral single-crystal diamond abrasive grains 4 tend to be more liable to be cracked due to the cleavage force with respect to the force acting in parallel with the Miller index {1,1,1} plane. However, in the octahedral single crystal diamond abrasive grain 4 of the present embodiment, two proximal end side mirror indices {1,1 are provided on both inner wall surfaces 51a, 51b of the mounting groove 5 in which the groove line 52 is parallel to the rotation axis CL. , 1} planes M1 and M2 are fixed. Therefore, since the circumferential direction of the wheel 2 to which a large dressing load is applied forms an angle of 35° with respect to the head side mirror index {1,1,1} planes H1 and H2 for dressing, the octahedral single crystal diamond abrasive is used. The particles 4 are hard to crack and can maintain a long life as a dresser.

Further, the octahedral single crystal diamond abrasive grains 4 have two base end side mirror index {1,1,1} planes M1, M2 and two head side mirror index {1,1,1} planes H1, H2. The top portions 42, 43 intersecting with and are covered with the plating layer 32 and plated. Therefore, the octahedral single-crystal diamond abrasive grains 4 have a structure that does not easily come off from the mounting groove 5. As a result, the wheel 2 itself can be prevented from being damaged by the falling of the octahedral single crystal diamond abrasive grains 4 and the life of the dresser that can be dressed using the octahedral single crystal diamond abrasive grains 4 can be extended.

Further, in the wheel 2, the load applied to the small-diameter diamond abrasive grains 31 on the outer peripheral surface 22 of the wheel 2 is reduced by the octahedral single crystal diamond abrasive grains 4, and damage to the wheel 2 itself is prevented as compared with the conventional case. The small-diameter diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are plated on the wheel 2 by the plating layer 32. Therefore, the small-diameter diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are removed from the wheel 2 by peeling off the plating layer 32 with a release agent or the like, so that the used wheel 2 without damage can be renewed. It can be easily reproduced as a dresser.
Further, the outer peripheral surface 22 of the wheel 2 narrowed by the front taper surface 21f and the back taper surface 21b provided on both sides of the outer peripheral portion of the wheel 2 which becomes thinner toward the outer periphery is arranged along the circumferential direction. A plurality of octahedral single crystal diamond abrasive grains 4 are provided. Therefore, the flank surface WF and the valley bottom portion WB formed by the octagonal single crystal diamond abrasive grains 4 in the fine grinding of the thread-shaped grindstone W can be dressed with high accuracy.

Further, on the outer peripheral surface 22 of the wheel 2, small-diameter diamond abrasive grains 31 are plated with a plating layer 32 between a plurality of octahedral single-crystal diamond abrasive grains 4.
According to this, it is possible to reliably prevent the outer peripheral surface 22 of the wheel 2 from being damaged by the small-diameter diamond abrasive grains 31 plated between the octahedral single-crystal diamond abrasive grains 4.

Two base end side mirror index {1,1,1} planes M1, M2, and two base end side mirror index {1,1,1} planes M1, M2 and two head side mirrors facing each other The apex portions 42 and 43 that intersect the index {1,1,1} planes H1 and H2 are arranged closer to the rotation axis CL side than the outer peripheral surface 22 in the radial direction of the wheel 2.
According to this, each octahedral single crystal diamond abrasive grain 4 has two base end side mirror index {1,1,1} planes M1, M2 and two head side mirror index {1,1,1} planes. The tops 42 and 43 intersecting with H1 and H2 are arranged at a position closer to the rotation axis CL side than the outer peripheral surface 22 in the radial direction of the wheel 2. Therefore, each octahedral single-crystal diamond abrasive grain 4 can be stably fixed in a state in which half or more are fitted in each mounting groove 5, and the octahedral single-crystal diamond abrasive grain 4 is attached to the outer periphery of the wheel 2. The dresser is less likely to fall off than the surface 22 and has a long life.

The grain size of the small-diameter diamond abrasive grain 31 is #20/30 to #100/120, and the grain size of the octahedral single crystal diamond abrasive grain 4 is #12/14 to #60/80.
According to this, it is possible to easily set the octahedral single crystal diamond abrasive grains 4 having a grain size ratio suitable for protection of the small-diameter diamond abrasive grains 31 constituting the diamond abrasive grain layer 3 to provide a dresser having a long life. can do.

The manufacturing method of the electrodeposition diamond dresser 1 for forming the screw-shaped grinding wheel W for gear grinding is performed by forming a disk shape having the front taper surface 21f and the back taper surface 21b on both sides of the outer peripheral portion so as to become thinner toward the outer peripheral surface 22. A wheel forming process for forming the wheel 2 made of heat-treated steel, and mounting in which groove grooves 52 extend along the direction of the rotation axis CL of the wheel 2 and both opposing groove inner wall surfaces 51a, 51b form an angle of 110°. A mounting groove forming step of forming a plurality of grooves 5 on the outer peripheral surface 22 of the wheel 2 at predetermined intervals, and an angle of 110° in the octahedral single crystal diamond abrasive grains 4 on both inner wall surfaces 51a and 51b of each mounting groove 5. An octahedral single-crystal diamond abrasive in which the octahedral single-crystal diamond abrasive grains 4 are adhered by an adhesive 6 on two proximal-end side mirror index {1,1,1} planes M1, M2 that form The grain adhering step, and a plurality of small areas on the outer peripheral surface 22 and the range (front belt-shaped portion 25f, back belt-shaped portion 25b) that extends in a belt shape with a predetermined width on the outer peripheral edge portions of the front tapered surface 21f and the back tapered surface 21b of the wheel 2. The diamond abrasive grain contacting step of bringing the diamond abrasive grains 31 into contact with each other; The electroplated layer 32 formed by electroplating is formed in a range (front strip portion 25f, back strip portion 25b) extending in a strip shape of the front taper surface 21f and the back taper surface 21b which are in contact with each other. The first electroplating step of plating the crystal diamond abrasive grains 4 and the small-diameter diamond abrasive grains 31 on the wheel 2 and the electroplating layer 32 formed on the wheel 2 by the first electroplating step are grown to be thick. Thus, the two base end side Miller index {1,1,1} planes M1. M2 and two proximal end side Miller index {1,1,1} planes M1. M2 and two head side mirror index {1,1,1} planes H1, H2 facing each other cover the tops 43, 42 intersecting with each other, and the octahedral single crystal diamond abrasive grains 4 are plated on the outer peripheral surface 22. And a second electroplating step.

According to this, the octahedral single crystal diamond abrasive grains 4 are formed on the inner wall surfaces 51a, 51b of the mounting groove 5 with the groove stripes 52 along the direction of the rotation axis CL on the base end side mirror index {1, 1, 1}. Since the surfaces M1 and M2 are bonded together, they can be firmly fixed to the narrow outer peripheral surface 22 of the wheel 2. Furthermore, two base end side Miller index {1,1,1} planes M1. Since the M2 and the two head side Miller index {1,1,1} planes H1, H2 cover the intersecting tops 43, 42 and are plated with the plating layer 32, an octahedral single crystal diamond abrasive grain is provided. The electrodeposited diamond dresser 1 for molding having a structure in which 4 does not easily drop can be easily manufactured.

In the thus-formed electrodeposited diamond dresser 1 for forming, the small-diameter diamond abrasive grains 31 and the octahedral single-crystal diamond abrasive grains 4 are plated on the wheel 2 by the electroplating layer 32. By peeling the electroplating layer 32 with a peeling agent or the like, the small-diameter diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are removed from the wheel 2, and the small-diameter diamond abrasive grains 31 and the octahedral single crystal are removed. The diamond abrasive grains 4 and are removed, and the used wheel 2 without damage can be easily regenerated as a new dresser.

In the present embodiment, the predetermined width in which the diamond abrasive grain layer 3 is provided is set such that the front taper surface 21f is larger than the back taper surface 21b, but the present invention is not limited to this. For example, a diamond abrasive grain layer may be provided with the same predetermined width on the back taper surface and the front taper surface. In this case, it is not necessary to combine two facing electroforming diamond dressers for dressing, and for example, one forming electroplated diamond dresser may be used for dressing a screw grinding wheel for gear grinding.

Further, although the particle size of the small-diameter diamond abrasive grains 31 provided in the diamond abrasive grain layer 3 is set to #60/80, it is not limited to this, and for example, in the range of #20/30 to #100/120. I wish I had it.

Further, in the embodiment, the polyhedral single-crystal diamond abrasive grains are octahedral single-crystal diamond abrasive grains 4(B), but the present invention is not limited to this. For example, as shown in FIG. 18, a hexahedral single crystal diamond abrasive grain (A), a rhombohedral dodecahedral single crystal diamond abrasive grain (C), a hexahedral crystal face, an octahedral crystal face, and a dodecahedral crystal face. Single crystal diamond abrasive grains (B-1) appearing in a mixed manner, single crystal diamond abrasive grains (B-2, B-3) in which an octahedral crystal face and a hexahedral crystal face appear in a mixed state, Single crystal diamond abrasive grain (B-4) in which a dihedral crystal surface and an octahedral crystal surface appear in a mixed manner, and a single crystal diamond in which an dodecahedral crystal surface and a hexahedral crystal surface appear in a mixed state An abrasive grain (C-1) can be mentioned.

Next, the attachment structure of the polyhedral single crystal diamond abrasive grains having different crystal shapes to the wheel 2 for each crystal shape will be described with reference to FIGS. 19 to 23. In each of the mounting grooves 5, 5d, 5h, 5do, 5oh of the wheel 2, groove grooves 52 are all formed in parallel with the rotational axis CL of the wheel. Although not shown, the adhesive and the plating layer are used for fixing to the wheel 2 like the octahedral single crystal diamond abrasive grains 4 (B).
In the attachment of the hexahedral single crystal diamond abrasive grains (A), as shown in FIG. 19, the attachment groove 5h formed in the wheel 2 is formed such that the angle between the opposing inner wall surfaces 51ha and 51hb of the groove is 90°. Has been done. The hexahedral single crystal diamond abrasive grain (A) is a corner portion formed by two crystal planes (mirror index {1,0,0} plane/he) as mounting crystal planes facing each other with a ridge line formed at an angle of 90°. Aligned with the groove line 52 of the mounting groove 5h, it is adhered and plated. The cleavage plane CS of the hexahedral single crystal diamond abrasive grain (A) is a plane parallel to the crystal plane he. The hexahedral single crystal diamond abrasive grains (A) are held so that the cleavage plane CS forms an angle of 45° with respect to the outer peripheral surface 22 of the wheel 2. In other words, the hexahedral single crystal diamond abrasive grains (A) are in contact with the outer peripheral surface 22 of the wheel 2 at the center position where the hexahedral single crystal diamond abrasive grains (A) are attached, assuming that the attachment groove 5h is not formed. The imaginary plane and the cleavage plane CS of the hexahedral single-crystal diamond abrasive grain (A) are positioned so as not to be parallel but to intersect at an angle of 45°.

Further, when the diamond dodecahedron single crystal diamond abrasive grains (C) are attached, as shown in FIG. 20, the attachment groove 5d formed on the wheel 2 has two inner wall surfaces 51da and 51db facing each other at the groove bottom. It has valley bottom surfaces 51dab and 51dbb forming a predetermined angle of 120°, and vertical surfaces 51dav and 51dbv that continuously rise from the upper ends of the valley bottom surfaces 51dab and 51dbb to the outer peripheral surface 22. The rhombohedral dodecahedron single crystal diamond abrasive grains (C) have two base end side crystal faces (for example, Miller index (1,1) as mounting crystal faces opposed to each other with the ridge line RL (see FIG. 18) interposed therebetween. , 0) plane do1 and Miller index (1, 0, 1) plane do2) form an angle of 120° with the groove 52 of the mounting groove 5d, and at that time, the crystal plane do which is vertical is a vertical plane. Adhesion and plating according to 51dav and 51dbv. The two sides S1 and S2 formed by the two head-side crystal faces do3 and do4 facing the two base-end side crystal faces do1 and do2 and the crystal faces do5 and do6 perpendicular to the head-side crystal faces do3 and do4 are larger than the outer peripheral surface 22. The position is close to the rotation axis line CL. The two crystal planes on the base end side are the Miller index (1,1,0) plane do1 and the Miller index (1,0,1) plane do2, but the present invention is not limited to this, and for example, the Miller index ( Two crystal planes on the base end side may be formed by the (1,1,0) plane and the Miller index (0,1,1) plane. The cleavage plane CS of the rhombic dodecahedron single crystal diamond abrasive grain (C) has a top where the three crystal planes do intersect as an apex, and considers a triangular drip having three hypotenuses extending from the apex. In this case, an equilateral triangular surface formed by the bottom surface of the triangular pyramid is applicable (see FIG. 18). The rhombic dodecahedron single crystal diamond abrasive grains (C) are held so that the cleavage plane CS is inclined with respect to the outer peripheral surface 22 of the wheel 2.

Further, in the attachment of the single crystal diamond abrasive grains (B-2, B-3) in which the octahedral crystal plane oc and the hexahedral crystal plane he appear, the attachment formed on the wheel 2 as shown in FIG. The groove 5oh has inner wall surfaces 51oha and 51ohb facing each other, having valley bottoms 51ohab and 51ohbb forming 110° at the groove bottom, and vertical surfaces 51ohav and 51ohbv rising from the upper part of the valley bottoms 51ohab and 51ohbb to the outer peripheral surface 22. is doing.
As shown in FIG. 21, the single crystal diamond abrasive grains (B-2, B-3) in which the octahedral crystal plane oc and the hexahedral crystal plane he appear have two octahedral crystal planes oc1 and oc2. As the crystal planes on the base end side, the bottom surfaces 51ohab, 51ohbb of the mounting groove 5oh are aligned, and the hexahedral crystal planes he are aligned with the vertical surfaces 51ohav, 51ohbv, and fixed. Two sides Si1 and Si2 formed by the two head-side crystal planes oc3 and oc4 facing the two base-end side crystal planes oc1 and oc2 and the crystal planes he1 and he2 that are perpendicular to the two head-side crystal planes oc1 and oc2 are larger than the outer peripheral surface 22. The position is close to the rotation axis line CL. In the case of the single crystal diamond abrasive grains (B-2, B-3) in which the octahedral crystal plane oc and the hexahedral crystal plane he appear, the crystal plane used for dressing is the octahedral crystal plane oc. .. Therefore, the cleavage plane is a plane parallel to the crystal face oc of the octahedron, and the single crystal diamond abrasive grains (B-2, B-3) in which the crystal face oc of the octahedron and the crystal face he of the hexahedron appear are The cleaved surface is held so as to be inclined with respect to the outer peripheral surface 22 of the wheel 2.
Further, in the crystal plane of the diamond single crystal, the Miller index {1,1,1} plane forming the octahedral crystal plane oc is harder than the Miller index {1,0,0} plane forming the hexahedral crystal plane he. Is high. Therefore, as shown in FIG. 21, the crystal face oc of the octahedron is attached to the opposite side of the attachment groove 5oh side (the outer side in the radial direction of the wheel 2), so that the Miller index {1,1,1} plane having a high hardness can be obtained. Can be used for dressing. This delays the progress of wear of the single crystal diamond abrasive grains (B-2, B-3) in which the octahedral crystal surface oc and the hexahedral crystal surface he appear, and can be a long-life dresser.

The rhombic dodecahedron crystal face do, the octahedron crystal face oc, and the hexahedron crystal face he appear on the wheel 2 as shown in FIG. 22 when the single crystal diamond abrasive grains (B-1) are attached. The mounting groove 5doh that is formed is a pair of inner wall surfaces 51doha and 51dohb that face each other. It is formed between the upper end and the lower ends of the vertical surfaces 51 dohav, 51 dohbv, and has two middle slopes 51 doham, 51 dohbm forming 71°.
In addition, the single crystal diamond abrasive grain (B-1) in which the rhombic dodecahedron crystal face do, the octahedron crystal face oc, and the hexahedron crystal face he appear has the octahedral crystal faces oc1 and oc2. As one of the crystal planes on the base end side, the hexahedron crystal plane he is fixed to the valley bottoms 51dohab and 51dohbb of the mounting groove 5doh and the vertical planes 51dohav and 51dohbv. It should be noted that the middle slopes 51 doham and 51 dohbm are respectively aligned with the sides Si1 and Si2 formed by the crystal faces do of two adjacent dodecahedrons. Two sides Shd1 and Shd2 (see FIG. 22) formed by the hexahedral crystal plane he and the dodecahedron crystal plane do are arranged closer to the rotation axis CL than the outer peripheral surface 22. The rhombic dodecahedral crystal face do, the octahedron crystal face oc, and the hexahedral crystal face he appear, and the single crystal diamond abrasive grain (B-1) is mainly composed of the crystal faces used for dressing. A crystal face do of a dihedron and a crystal face oc of an octahedron. The rhombic dodecahedron crystal face do, the octahedron crystal face oc, and the hexahedron crystal face he appear, and the single crystal diamond abrasive grain (B-1) shows that the cleavage planes of any of these crystals are in the wheel 2 Is held so that the cleavage plane is inclined with respect to the outer peripheral surface 22 of the.
Further, in the crystal plane of the diamond single crystal, the Miller index {1,1,1} plane which constitutes the octahedral crystal plane oc and the Miller index {1,1,0} plane which constitutes the dodecahedron crystal plane do are , The hardness is higher than the Miller index {1,0,0} plane that constitutes the hexahedral crystal plane he. Therefore, as shown in FIG. 22, the octahedral crystal plane oc and the dodecahedron crystal plane do Miller index {1,1,1} plane are attached to the side opposite to the attachment groove 5doh side (outer side in the radial direction of the wheel 2). As a result, dressing can be performed using the crystal planes oc and do having high hardness. As a result, the rhombic dodecahedron crystal face do, the octahedron crystal face oc, and the hexahedron crystal face he delay the progress of wear of the appeared single-crystal diamond abrasive grains (B-1), and the long-life dresser. Can be

The rhombic dodecahedron crystal plane do and the octahedron crystal plane oc appear, when the single crystal diamond abrasive grains (B-4) are attached, as shown in FIG. 23, as shown in FIG. The two inner wall surfaces 51 doa and 51 dob which face each other are formed at an angle which is continuous with the bottom surfaces 51 doab and 51 dobb which form 110 degrees at the bottom of the groove and the upper ends of the bottom surfaces 51 doab and 51 dobb, and which form 71 degrees facing each other. It has two upper slopes 51 doau and 51 dobu.
The rhombic dodecahedron crystal plane do and the octahedral crystal plane oc appear, and the single crystal diamond abrasive grain (B-4) has the octahedral crystal planes oc1 and oc2 as two crystal planes on the base end side. , The bottoms of the mounting grooves 5do are fixed to the bottoms 51doab and 51dobb. Note that the upper slopes 51 doau, 51 dobu are respectively aligned with the sides Si1, Si2 formed by the crystal faces do of two adjacent dodecahedrons. The two apexes AP1 and AP2 formed by the four dodecahedron crystal planes (see FIG. 23) are configured to be closer to the rotation axis CL than the outer peripheral surface 22. The single crystal diamond abrasive grains (B-4) in which the rhombic dodecahedron crystal planes do and the octahedron crystal planes oc have appeared are compared with the outer peripheral surface 22 of the wheel 2 in any of the cleavage planes of these crystals. It is held so as to be inclined.
The rhombic dodecahedron crystal planes do and the hexahedron crystal planes he appear, and the single crystal diamond abrasive grains (C-1) are attached according to the rhombohedral dodecahedron single crystal diamond abrasive grains (C). Therefore, the description is omitted.

Further, the grain size of the octahedral single crystal diamond abrasive grains 4 is #16/18, but is not limited to this. For example, the grain size may be in the range of #12/14 to #60/80, and preferably, when the small-diameter diamond abrasive grains are large #20/30, the octahedral single crystal diamond abrasive grains are also large #12/14. To use.

Further, 80 octahedron single crystal diamond abrasive grains 4 are arranged on the outer peripheral surface 22 of the wheel 2, but the invention is not limited to this. Depending on the size (grain size) of the small-diameter diamond abrasive grains of the diamond abrasive grain layer or the length of the outer peripheral surface of the wheel, an arbitrary number such as 70 or 100 can be determined and arranged. ..

Further, although the plating of the small-diameter diamond abrasive grains and the polyhedral single-crystal diamond abrasive grains was performed by electroplating, the plating is not limited to this. For example, electroless plating may be used, or a plating layer may be formed by electroplating and electroless plating to deposit small-diameter diamond abrasive grains and polyhedral single-crystal diamond abrasive grains.

Further, although the adhesive 6 is a non-conductive adhesive, the adhesive is not limited to this and may be, for example, a conductive adhesive. As the conductive adhesive, for example, an epoxy resin-based adhesive mixed with a conductive filler can be used. Examples of conductive fillers include carbon-based fillers such as carbon black and graphite, and metal-based fillers such as Ni and Cu powders. When the octahedral single crystal diamond abrasive grains are bonded with a conductive adhesive, the growth of the electroplating layer is started from the conductive adhesive that adheres the octahedral single crystal diamond abrasive grains to the octahedral single crystal diamond abrasive grains. No gap is formed between the electroplated layer. As a result, the fixing by the electroplating layer can be made stronger.

As described above, the specific configurations described in the above-described embodiments are merely examples of the present invention, and the present invention is not limited to such specific configurations, and the gist of the present invention is not limited. Various modes can be adopted without departing from the scope.

(Industrial availability)
It is used for electrodeposition diamond dresser for forming screw-shaped grinding wheel for gear grinding, which requires high precision and long life.

DESCRIPTION OF SYMBOLS 1... Electrodeposition diamond dresser for forming, 2... Wheel, 21... Tapered surface, 21f... Front taper surface, 21r... Back taper surface, 22... Outer peripheral surface, 25f... Front strip|belt-shaped part (band-shaped range), 25b... Back strip|belt-shaped Part (band-shaped range), 26... Outer peripheral portion, 3... Diamond abrasive grain layer, 31... Small-diameter diamond abrasive grain, 32... Electroplating layer (plating layer), 4... Octahedral single crystal diamond abrasive grain (polyhedron) Single crystal diamond abrasive grains), 41... Ridge line, 42... Top part, 43... Top part, 5... Mounting groove, 51a... Inner groove wall surfaces, 51b... Inner groove wall surfaces, 52... Groove streak, 6... Adhesive, CL... Rotation axis, do1, do2... Dodecahedral crystal plane (attachment crystal plane), oc1, oc2... Octahedron crystal plane (attachment crystal plane), H1, H2... Head side Miller index {1,1, 1} Plane, M1, M2... Mirror index on the base end side {1,1,1} plane (attached crystal plane).

Claims (8)

A wheel made of tempered steel that is formed in a disk shape having tapered surfaces on both sides of the outer peripheral portion so as to become thinner toward the outer peripheral surface and is driven to rotate around the rotation axis,
Extending in a strip shape with a predetermined width on the outer peripheral edge of the tapered surface, a plurality of small-diameter diamond abrasive grains are plated with a diamond abrasive grain layer,
A plurality of mounting grooves formed on the outer peripheral surface of the wheel in parallel with the rotation axis and having inner wall surfaces of the groove forming a predetermined angle;
It is formed in a grain larger than the small-diameter diamond abrasive grain, has an attachment crystal plane equal to the predetermined angle, and when the attachment crystal plane is attached to both wall surfaces in the groove, it is parallel to the outer peripheral surface of the wheel. And a polyhedral single-crystal diamond abrasive grain that is a crystal whose surface that does not become a cleavage plane,
Each of the polyhedral single crystal diamond abrasive grains, the mounting crystal surface is plated with the plating layer on both wall surfaces in the groove of the mounting groove of the wheel,
On the outer peripheral surface of the wheel, between the plurality of polyhedral single crystal diamond abrasive grains, the small-diameter diamond abrasive grains are plated with the plating layer. An electrodeposition diamond dresser for forming a screw-shaped grinding wheel for gear grinding. .. The plurality of polyhedral single crystal diamond abrasive grains are a plurality of octahedral single crystal diamond abrasive grains,
The attached crystal planes are two proximal end side Miller index {1,1,1} planes that are adjacent to each other at a ridgeline forming an angle of 110° in an octahedral single crystal diamond abrasive grain,
In the wheel, a groove line extends in the direction of the rotation axis, and a plurality of the mounting grooves having opposing inner wall surfaces of the groove forming 110° are arranged on the outer peripheral surface.
Both inner wall surfaces of each of the mounting grooves and the two base end side mirror index {1,1,1} faces of each octahedral single crystal diamond abrasive grain are bonded with an adhesive,
The plating layer includes two base end side mirror index {1,1,1} planes and two head side sides facing the two base end side mirror index {1,1,1} planes. The screw-shaped grindstone for gear grinding according to claim 1, wherein the octahedron single crystal diamond abrasive grains are plated on the outer peripheral surface so as to cover the top portion where the mirror index {1,1,1} plane intersects. Electroplated diamond dresser. The plurality of polyhedral single crystal diamond abrasive grains are a plurality of dodecahedron single crystal diamond abrasive grains,
The attached crystal planes are continuous with two base end side crystal planes facing each other at an angle of 120° with a ridge line appearing in the dodecahedron single crystal diamond abrasive grain, and the base end side crystal planes, respectively. The dodecahedron single crystal diamond abrasive grain is configured to include two vertical surfaces arranged vertically when being attached to the attachment groove,
In the wheel, a groove line extends in the direction of the rotation axis, and a plurality of the mounting grooves having opposing inner wall surfaces of the groove forming 120° are arranged on the outer peripheral surface.
Both the inner wall surfaces of each of the mounting grooves, and the two base end side crystal faces of each dodecahedron single crystal diamond abrasive grain are bonded with an adhesive,
The plating layer covers the two head side crystal planes facing each other with respect to the two base end side crystal planes, and the two sides where the two vertical planes intersect each other, and the dodecahedron single crystal. The electrodeposited diamond dresser for forming a screw-shaped grindstone for gear grinding according to claim 1, wherein diamond abrasive grains are plated on the outer peripheral surface. Said two head side crystal surface, the two vertical plane is, the edges intersect, the claims in the radial direction than the outer peripheral surface is disposed at a position closer to the rotation axis side of the wheel 3 An electrodeposited diamond dresser for forming a screw-shaped grindstone for grinding a gear according to. The two base end side Miller index {1,1,1} planes and the two head side Miller index {1 that oppose each other with the two base end side Miller index {1,1,1} planes. , 1,1} plane and is the top crossing is threaded grinding wheel for gear grinding according to claim 2 which is located closer to the axis of rotation side than the outer peripheral surface in the radial direction of the wheel Electrodeposited diamond dresser for forming. The grain size of the small-diameter diamond abrasive grains is #20/30 to #100/120,
The grain size of the polyhedral single crystal diamond abrasive grains is #12/14 to #60/80. The electrodeposited diamond dresser for forming a thread grinding wheel for gear grinding according to any one of claims 1 to 5. .. A wheel forming step of forming a wheel made of heat-treated steel in a disk shape having tapered surfaces on both sides of the outer peripheral portion so as to become thinner toward the outer periphery,
A plurality of mounting grooves are formed at predetermined intervals on the narrowed outer peripheral surface of the wheel, in which groove walls extend along the direction of the axis of rotation of the wheel and the opposing inner wall surfaces of the groove form an angle of 110°. Mounting groove forming step,
The two proximal end side Miller index {1,1,1} planes adjacent to each other at the ridgeline forming an angle of 110° in the octahedron single crystal diamond abrasive grains on both inner wall surfaces of the respective mounting grooves, An octahedral single crystal diamond abrasive grain bonding step of bonding an octahedral single crystal diamond abrasive grain with an adhesive,
A diamond abrasive grain contacting step of bringing a plurality of small-diameter diamond abrasive grains into contact with the outer peripheral surface and the outer peripheral surface of the outer peripheral surface of the tapered surface of the wheel that extends in a band shape with a predetermined width,
The octahedral single-crystal diamond abrasive grains are adhered to the outer peripheral surface to which the small-diameter diamond abrasive grains are contacted, and the taper surface to which the small-diameter diamond abrasive grains are contacted is in a range extending in the band shape. , Forming a plating layer formed by plating, and plating the small-diameter diamond abrasive grains in the range extending in the outer peripheral surface and the strip shape, the octahedral single crystal diamond abrasive grains, the two Base end side Miller index {1,1,1} plane and two head side Miller index {1,1,1 facing each other with the two base end side Miller index {1,1,1} planes. And a plating step of plating on the outer peripheral surface so as to cover the intersecting tops of the surfaces. The method for producing an electrodeposited diamond dresser for forming a screw grinding wheel for gear grinding. In the mounting groove forming step, the two proximal mirrors adjacent to each other at a ridge line are formed such that the depth dimension of each mounting groove forms an angle of 110° in each octahedral single crystal diamond abrasive grain to be mounted. claim wherein the top of the spaced apart side exponent {1,1,1} plane is formed in the depth dimension can be located closer to the axis of rotation side than the outer peripheral surface in the radial direction of the wheel 7 5. A method for producing an electrodeposited diamond dresser for forming a screw-shaped grindstone for gear grinding according to.

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