KR102189236B1 - Electrodeposited diamond dresser for shaping screw-type grindstone for gear grinding and manufacturing method thereof - Google Patents

Abstract

The present invention provides an electrodeposited diamond dresser for shaping a screw-type grindstone for gear grinding that is capable of high-precision dressing and has a long life.
A wheel (2) formed in a disk shape with tapered surfaces (21) on both sides of the outer circumference to be thinner toward the outer circumferential surface, and a diamond abrasive grain that extends to the outer circumferential edge of the tapered surface, and a plurality of small-diameter diamond grains are plated by a plating layer. The layer 3, a plurality of mounting grooves 5 formed on the outer circumferential surface of the wheel and having both wall surfaces in the grooves forming a predetermined angle, and a mounting crystal surface M1 that is formed in a granular shape larger than that of a small-diameter diamond abrasive grain, and is equal to a predetermined angle. , M2), and when the mounting crystal surface is installed on both wall surfaces 51a and 51b in the groove, the surface parallel to the outer circumferential surface of the wheel contains polyhedral single crystal diamond grains (4), which are crystals that do not become cleavage surfaces, and each polyhedral single crystal The diamond abrasive grains are plated with a plating layer 32 on both wall surfaces of the mounting grooves of the wheel with the mounting crystal surface.

Description

Electrodeposited diamond dresser for shaping screw-type grindstone for gear grinding and manufacturing method thereof

The present invention relates to an electro-deposited diamond dresser for forming a threaded grindstone for grinding gears, and a method of manufacturing the same.

Some grindstones for grinding gears are of a screw type (worm type), and a dresser for forming a screw type is required to be particularly elaborate.

The dresser described in Patent Document 1 has two tapered working surfaces for dressing the flank surface of a screw-type grindstone and an outer circumferential working surface for dressing the curved bottom of the screw of the threaded grindstone. . Small particle diameter diamond abrasive grains are formed on these working surfaces.

As a conventional technique, according to Patent Document 1, a pair of dressers are disposed on a rotating shaft with a predetermined length apart, and each dresser is used by contacting two tapered working surfaces with the other flank surfaces of a worm-shaped grinding stone.

International Publication No. 2007/000831

However, in patent document 1, in order to improve the precision of dressing, the width of the outer peripheral action surface formed by the tapered surface of the front and back of each dresser is formed narrowly. When dressing the flank surface or the curved bottom of the screw of the worm-shaped grinding wheel on this narrow outer circumferential working surface, there is a problem that the small-diameter diamond abrasive grains fall off due to a large contact load, and the life of the dresser is shortened.

The present invention has been made in order to solve the related problems of the related art, and provides an electrodeposited diamond dresser for shaping a threaded grindstone for gear grinding with a high precision dressing and a long life.

In order to solve the above-described problem, the structural feature of the invention according to claim 1 is, in the electrodeposited diamond dresser for shaping a screw-type grindstone for gear grinding, a disc-shaped disk having tapered surfaces on both sides of the outer circumferential portion so as to become thinner toward the outer circumferential surface. A wheel made of tempered steel that is formed with a rotation axis and is driven to rotate around the axis of rotation, and a band-like extension with a predetermined width on the outer peripheral edge of the tapered surface, and a plurality of small-diameter diamond abrasive grains are plated with a plating layer. A diamond abrasive layer attached, a plurality of mounting grooves formed parallel to the rotation axis on the outer circumferential surface of the wheel and having both wall surfaces in the grooves forming a predetermined angle, and a granular shape larger than the small-diameter diamond abrasive grains. It is formed and has a mounting crystal surface equal to the predetermined angle, and when the mounting crystal surface is mounted on both wall surfaces in the groove, the surface parallel to the outer circumferential surface of the wheel does not become a cleavage surface. The polyhedral single crystal diamond abrasive grains are included, and each of the polyhedral single crystal diamond abrasive grains has the mounting crystal surface plated on both wall surfaces of the mounting grooves of the wheel by the plating layer.

The outer circumferential surface of the wheel refers to the outer circumferential surface of a disk-shaped wheel in the case where the mounting groove is not formed. In addition, since the outer circumferential surface of the wheel is curved, it cannot be originally expressed as parallel to the planar cleavage surface. However, since the crystal plane of the polyhedral single crystal diamond abrasive grain is minute with respect to the outer circumferential surface of the wheel, the outer circumferential surface of the wheel can be regarded as a substantially flat surface in comparison with that of the polyhedral single crystal diamond abrasive grain. Therefore, in the scope and specification of the present application, the outer peripheral surface of the wheel and the cleavage surface of the polyhedral single crystal diamond abrasive grains are described using the expression "parallel".

Originally, it means that a plane parallel to the "virtual plane" in contact with the outer peripheral surface of the wheel at a position opposite to the center of both wall surfaces in the groove is a crystal that does not become a cleavage surface of a polyhedral single crystal diamond abrasive grain.

Conventionally, a wheel thinning toward the outer circumferential surface has a narrow outer circumferential surface due to tapered surfaces provided on both sides of the outer circumferential portion, and the number of small-diameter diamond abrasive grains per unit area is small. Therefore, a dressing load is applied to the small particle diameter diamond abrasive grains arranged on the outer circumferential 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 exerted on the diamond abrasive grain layer composed of the polyhedral single crystal diamond grains including the small grain diamond grains is reduced, the drop-off of the small grain diamond grains is prevented, and the damage to the wheel itself is prevented to further extend the life of the dresser. I can make it.

In addition, on the outer peripheral surface of the wheel, a plurality of mounting grooves having both wall surfaces in the groove forming a predetermined angle are formed in parallel with the rotation axis, and the polyhedral single crystal diamond abrasive grain is the mounting crystal surface equal to a predetermined angle of both wall surfaces in the groove, and the outer peripheral surface of the wheel Plating is attached to both wall surfaces in the groove so that the surface parallel to and does not become a cleavage surface. Therefore, the polyhedral single crystal diamond abrasive grains are difficult to crush and are firmly fixed to the wheel, so that the life as a dresser can be extended.

Fig. 1 is a view showing an electrodeposited diamond dresser for shaping according to an embodiment of the present invention viewed from the rear side.
Fig. 2 is a diagram showing a cross section II-II of the electrodeposited diamond dresser for shaping in Fig. 1.
3 is a cross-sectional view showing an enlarged tapered surface in FIG. 2.
Fig. 4 is a view showing an enlarged outer periphery of Fig. 3;
Fig. 5 is a partially enlarged view showing the outer circumferential surface of the electrodeposited diamond dresser for molding from the outside.
Fig. 6 is a partially enlarged view showing the outer peripheral surface of the electrodeposited diamond dresser for shaping from the side.
Fig. 7 is a diagram showing a model of an octahedral single crystal diamond abrasive grain.
Fig. 8 is a flowchart showing the manufacturing procedure of an electrodeposited diamond dresser for molding.
Fig. 9 is a partially enlarged view showing a step of forming a mounting groove.
Fig. 10 is a diagram showing a step of applying an adhesive to the mounting groove.
Fig. 11 is a diagram showing a step of bonding an octahedral single crystal diamond abrasive grain to a mounting groove.
Fig. 12 is a diagram showing an electroplating bath in which an electroplating layer is formed on a wheel.
Fig. 13 is a diagram showing a step of bringing a small-particle diamond abrasive grain into contact with a wheel.
Fig. 14 is a diagram showing a step of forming an electroplating layer and removing excess small particle diameter diamond abrasive grains.
Fig. 15 is a diagram showing a step of growing an electroplating layer.
It is a figure explaining the state of dressing a threaded grindstone.
[Fig. 17] A diagram comparing durability of the number of dressings of a conventional dresser and this dresser.
Fig. 18 is a diagram showing the types of crystal shapes of polyhedral single crystal diamond abrasive grains.
Fig. 19 is a diagram showing a state in which a hexahedral single crystal diamond abrasive grain is mounted in a mounting groove of a wheel.
Fig. 20 is a diagram showing a state in which a rhomboid dodecahedron single crystal diamond abrasive grain is attached to a mounting groove of a wheel.
Fig. 21 is a diagram showing a state in which single crystal diamond abrasive grains in which the crystal plane of the octahedron and the crystal plane of the hexahedron are displayed are mounted in the mounting groove of the wheel.
[Fig. 22] A diagram showing a state in which single crystal diamond abrasive grains in which crystal faces of a rhomboid dodecahedron and a crystal face of an octahedron and a crystal face of a hexahedron are shown are mounted in a mounting groove of a wheel.
Fig. 23 is a diagram showing a state in which single crystal diamond abrasive grains in which crystal planes of a rhomboid dodecahedron and a crystal plane of an octahedron are shown are attached to a mounting groove of a wheel.

(Embodiment)

Hereinafter, an embodiment of an electrodeposited diamond dresser for shaping a screw-type grindstone 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 shaping is provided on the wheel 2, the diamond abrasive layer 3 installed on the wheel 2, and the outer peripheral surface 22 of the wheel 2 It contains an octahedral single crystal diamond abrasive grain (4).

(Wheel)

As shown in Figs. 1 and 2, the wheel 2 is, for example, a steel member, with a tapered surface 21 that becomes thinner toward the outer periphery, and has two front and rear surfaces (the outer tapered surface 21f, the inner tapered surface 21b). ] It is equipped and formed in a disc shape. As the tempered steel member, hardened steel, forged steel (SUJ), and the like are used, for example. The outer tapered surface 21f extends from the surface of the thick disk 23 formed in the central portion of the wheel 2 to the outer peripheral surface 22 continuously. The inner tapered surface 21b is the outer circumferential surface 22 continuously from the surface of the end portion 24 formed with a step difference in the direction in which the thickness becomes thinner than the rear surface of the thick disk portion 23 formed thickly in the central portion of the wheel 2 Extended to. The outer circumferential surface 22 is formed to have a narrow width in the direction along the rotation axis CL by an outer tapered surface 21f and an inner tapered surface 21b formed to be thinner toward the outer circumference (see FIGS. 3 and 4). .

And, in the wheel 2, the side on which the outer tapered surface 21f in which the diamond abrasive layer 3 is formed wide in a band-like width with a predetermined width is formed is referred to as a front side, and is narrower than the outer tapered surface 21f. The side on which the inner tapered surface 21b in which the diamond abrasive layer 3 is formed in a band shape by width is formed is referred to as a back side (裏側). On the outer side tapered surface 21f of the wheel 2, the outer circumferential edge portion 26 is formed in a strip shape with a predetermined width, and an outer strip 25f is formed. Further, on the inner tapered surface 21b, an inner belt-shaped portion 25b is formed in the outer peripheral edge portion 26 with a width narrower than that of the outer belt-shaped portion 25f. In the outer band-shaped portion 25f and the inner band-shaped portion 25b, a plurality of small-diameter diamond abrasive grains 31 are formed with a diamond abrasive grain layer 3 that is plated by a plating layer described later.

(Diamond geological layer)

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

(Mounting groove)

On the outer circumferential surface 22 of the wheel 2, as shown in Fig. 9, both wall surfaces 51a and 51b in the facing grooves form 110°, and the groove line 52 is parallel to the rotation axis CL direction of the wheel 2 A plurality of mounting grooves 5 (80 locations in the present embodiment) extending so as to be extended are formed. One octahedral single crystal diamond abrasive grain 4 is fixed to each of the mounting grooves 5. As shown in Fig. 7, the octahedral single crystal diamond abrasive grain 4 forms an octahedron called an octahedron type, and a particle size of, for example, #16/18 is used. Both wall surfaces 51a and 51b in the groove of the mounting groove 5 shown in FIG. 9 are formed at a predetermined angle of 110°. On both wall surfaces 51a and 51b in the groove, as shown in Fig. 11, two adjacent miller indexes on the base end side by forming an angle of 110° to the octahedral single crystal diamond abrasive grain 4, {1, 1, 1} planes (M1, M2) are attached together [here, two proximal side mirror indexes {1, 1, 1} are referred to as octahedral single crystal diamond abrasive grains 4 and 8 Miller indexes {1, 1] , Among the 1} planes, two Miller indexes {1 that are disposed on the rotation axis CL side of the wheel 2 (the mounting groove 5 side) and adhered to both wall surfaces 51a and 51b in the groove of the mounting groove 5 , 1, 1} planes are referred to, and the two base end side Miller indexes {1, 1, 1} planes correspond to "mounting crystal planes"]. In addition, the head side mirror index {1, 1, 1} plane refers to the mounting facing the two base end side mirror index {1, 1, 1} planes positioned on the mounting groove 5 side as the mounting crystal surface. The two Miller index {1, 1, 1} planes arranged on the opposite side to the groove 5 are assumed.

In this case, the mounting groove 5 is, as shown in Figs. 7 and 9, when the octahedral single crystal diamond abrasive grain 4 is mounted, as shown in Figs. 7 and 9, the two base end-side Miller indexes in the octahedral single crystal diamond abrasive grain 4 { 1, 1, 1} planes (M1, M2) and two proximal side mirror indexes {1, 1, 1} planes (M1, M2) and two head side mirror indexes {1, 1, 1} facing each other The top (42, 43) where the planes (H1, H2) intersect (the top part 42 is represented by coordinates (1, 0, 0), and the top part 43 is represented by coordinates (-1, 0, 0)) Is formed so as to be able to be disposed 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. 7 and 11).

The two proximal end-side Miller index {1, 1, 1} planes (M1, M2) adjacent to both wall surfaces 51a and 51b in the groove of the mounting groove 5 at 110° to the octahedral single crystal diamond abrasive grain 4 are, It is bonded with an adhesive 6. As the adhesive 6, for example, an epoxy resin-based non-conductive adhesive is used.

(Octahedral single crystal diamond abrasive grain)

The octahedral single crystal diamond abrasive grain 4 is plated on the outer circumferential surface 22 of the wheel 2 in the electroplating layer 32 together with the small-diameter diamond abrasive grain 31 (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} plane (H1, H2) The intersecting top portions 42 and 43 are covered, and the octahedral single crystal diamond abrasive grains 4 are plated onto the outer peripheral surface 22 (see Figs. 5, 6, 7 and 15). In this way, the octahedral single crystal diamond abrasive grains 4 are firmly plated onto the outer peripheral surface 22 of the wheel 2 by the electroplating layer 32.

In addition, the octahedral single crystal diamond abrasive grains 4 shown in FIGS. 3 to 6 are not in the same shape as the octahedral crystals, but a shape formed by matching the blade surfaces of the small-particle diamond abrasive grains 31 arranged in the diamond abrasive layer 3 It is made into. The cleavage surface CS refers to a surface in that direction when the crystal is fragile in a specific direction, and in the case of an octahedral single crystal diamond 4, a surface parallel to the {1, 1, 1} plane [In this case, the Miller index { 1, 1, 1} plane]. As shown in Figs. 5 and 6, the octahedral single crystal diamond abrasive grain 4 has a surface Miller index {1, 1, 1} plane parallel to the cleavage surface CS on the outer surface. When processing a place other than the cleavage surface CS, diamonds are rubbed against each other and polished. A small-diameter diamond abrasive grain 31 is also arranged between 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 in contact with an imaginary plane in contact with the outer circumferential surface 22 of the wheel 2 in the case where the mounting groove 5 is not formed, at the center position where the octahedral single crystal diamond abrasive grain 4 is mounted. , It is positioned so that the cleavage surface CS of the octahedral single crystal diamond abrasive grain 4 crosses at an angle of 35°, not parallel.

In the center of the wheel 2, a center hole 27 fitted with a centering boss protruding toward the shaft end of the drive shafts SFr and SFl (see Fig. 16) is installed. Around the center hole 27, three female screw holes 28 with female threads and three bolt holes 29 through which bolts are inserted are formed (see Figs. 1 and 2).

(Sequence of manufacturing method)

Next, the manufacturing method of the electrodeposition diamond dresser 1 for shaping|molding of a threaded grindstone for gear grinding will be described below based on Figs.

The wheel 2 is formed in a disk shape by, for example, a grinding plate [wheel formation process step 101 (hereinafter, step is abbreviated as "S")] (see Fig. 8). The wheel 2 is formed by a tempered steel member, and is formed on the outer tapered surface 21f, the inner tapered surface 21b, and the front and back of the outer peripheral portion so as to be thinner toward the outer periphery. The outer tapered surface 21f is formed so as to extend continuously from the surface of the thick disk portion 23 formed in the central portion of the wheel 2 to the outer peripheral surface 22. A thick disk portion 23 that is thickly installed in the center portion of the rear side of the wheel 2 is formed, and an end portion 24 having a step in the direction of decreasing the thickness is formed on the outer peripheral portion of the thick disk portion 23. The inner tapered surface 21b is formed so as to extend continuously to the outer peripheral surface 22 from the surface of the end portion where the end portion 24 is formed thinly.

In the center of the wheel 2, a central hole 27 through which the drive shafts SFr and SFl (FIG. 16) passes is provided. Around the center hole 27, three female screw holes 28 in which a female screw is screwed, and three bolt holes 29 through which bolts are inserted are formed (see Fig. 1).

Next, the mounting groove 5 is formed on the outer circumferential surface 22 of the wheel 2 by, for example, wire processing (mounting groove forming step S102) (see Fig. 9). 7 and 9, the groove line 52 extends along the direction of the rotation axis CL of the wheel 2, and both wall surfaces 51a and 51b in the opposite groove are 110°. Two proximal side mirror index {1, 1, 1} planes (M1, M2) which form an angle and form an angle of 110° in each of the mounted octahedral single crystal diamond abrasive grains 4 and are adjacent to the ridge line 41 The two tops 42 and 43 on the side separated from each other of the wheel 2 have a depth dimension that can be disposed closer to the rotation axis CL side than the outer circumferential surface 22 in the radial direction of the wheel 2 (FIG. 9 and FIG. 11). A plurality of mounting grooves 5 (80 locations in this embodiment) are formed on the outer peripheral surface 22 of the wheel 2 at predetermined intervals.

Next, the octahedral single crystal diamond abrasive grains 4 are bonded to both wall surfaces 51a and 51b in the groove of the mounting groove 5 (octahedral single crystal diamond abrasive grain bonding step S103) (see Figs. 10 and 11). In this case, the two proximal end-side Miller index {1, 1, 1} planes M1, M2, which form an angle of 110° in the octahedral single crystal diamond abrasive grain 4, and are adjacent at the ridge line 41, are applied to the adhesive 6 ) To adhere to both wall surfaces 51a and 51b in the groove. As the adhesive 6, as the non-conductive adhesive, for example, an epoxy resin adhesive can be used.

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

Next, the wheel 2 in which the octahedral single crystal diamond abrasive grains 4 are adhered and the small-diameter diamond abrasive grains 31 are in contact is temporarily plated by electroplating in a nickel solution (first electroplating step S105). ) (See Figs. 12 and 14). In the electroplating bath 7, for example, a plating solution 71 obtained by mixing boric acid, nickel sulfate, nickel chloride, or the like is accommodated. In the plating solution 71, a nickel electrode 72 is provided as an anode. Wheel 2 is assigned as the cathode. To the flange portion 73a of the conductive support member 73 connected to the negative terminal, the wheel 2 is fastened with a nut 74, and the wheel 2 is a bottom plate 75 and a vinyl chloride bracket. The rubber masking member 77 is held in the vertical direction by 76. By this electroplating, an electroplating layer 32 is formed between the small particle diameter diamond abrasive grains 31 and the wheel 2 in contact with the surface of the wheel 2, and the small particle diameter diamond abrasive grains 31 are formed in the wheel 2 Temporary plating is applied to the surface of (see Fig. 14).

Next, the excess small particle diameter diamond abrasive grains 31 that are not temporarily plated on the surface of the wheel 2 are removed (excess small particle diameter diamond abrasive grain removal step S106) (see Fig. 14). Thereby, it is possible to form the diamond abrasive layer 3 with high shape accuracy as a further abrasive layer.

Next, an electroplating layer 32 is further formed on the wheel 2 from which the excess small-diameter diamond abrasive grains 31 have been removed (2nd 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 proximal end-side Miller indexes {1, 1, 1} planes (M1, M2) and two proximal end-side Miller indexes { Octahedral single crystal diamond abrasive grain by covering the tops (42, 43) where the 1, 1, 1} planes (M1, M2) and two head-side Miller indexes {1, 1, 1} planes (H1, H2) cross each other (4) is plated onto the outer peripheral surface 22. In this case, the electroplating layer 32 secures the base end side of the octahedral single crystal diamond abrasive grain 4 (the side where the octahedral single crystal diamond abrasive grain 4 is fixed to the wheel 2) to the outer peripheral surface 22 of the wheel 2 It is attached with this plating.

(work)

Next, in the case of dressing a gear grinding threaded grindstone (hereinafter referred to as a threaded grindstone) (W) using the electrodeposited diamond dresser 1 for shaping the threaded grindstone for gear grinding in the present embodiment. It will be briefly described.

First, as shown in Fig. 16, at opposite ends of the two drive shafts (SFr, SFl) arranged coaxially, each electrodeposited diamond dresser 1 for molding is installed so as not to rotate relative to each other by bolts (B) or the like. Has been. The two electrodeposited diamond dressers 1 (1R, 1L) for shaping are arranged to face the outer tapered surface 21f provided with the diamond abrasive layer 3. The drive shafts SFr and SFl rotate by transmitting a drive torque by a drive motor (not shown) through a deceleration device (not shown). The rotational speeds of the drive shafts SFr and SFl are configured to be changed to an arbitrary circumferential speed by a mechanism for switching the gear ratio in the reduction device. The two drive shafts SFr and SFl are included in a proximity and separation movement mechanism (not shown) that is approached and separated in the direction of the rotation axis CL.

The threaded grindstone W, which is an object to be polished, is assembled to a rotation shaft (not shown) capable of rotating at a circumferential speed different from that of the drive shafts SFr and SFl so as not to be relatively rotatable. The rotation shaft in which the drive shafts SFr and SFl and the screw-type grindstone W are assembled is included in a cut-out movement mechanism (not shown) (not shown) that allows access and separation in a state parallel to each other. In addition, the rotation shaft in which the drive shafts (SFr, SFl) and the screw-type whetstone (W) are assembled means a delivery movement mechanism (not shown) that enables relative movement in the axial direction by interlocking with the rotation of the rotation shaft in which the screw-type whetstone (W) is assembled Not included).

When dressing is performed, for example, by lowering the peripheral speed of the threaded grinding wheel (W) than the peripheral speed of the forming electrodeposited diamond dresser (1), the electrodeposited diamond dresser (1) and the threaded grinding wheel (W) for forming are The contact points are rotated in opposite directions to each other so as to rotate in the same tangential direction. Then, it approaches while adjusting the cut amount by the cut-out movement mechanism, and dressing the side surface (the flank surface WF) of the trough of the screw tooth of the screw-type grindstone W. And, in synchronization with the rotation of the screw shape of the screw type grinding wheel W, the electrodeposition diamond dresser 1 for molding and the screw type grindstone W are relatively moved in the axial direction by a delivery movement mechanism, and the thread type grindstone W ) The flank surface (WF) and the curved bottom (WB) are continuously dressed. In this case, the cutting amounts of the two electrodeposition diamond dressers 1 for molding are synchronized by the cutting movement mechanism, and the delivery movement amounts of the two electrodeposition diamond dressers 1 for molding are determined by the delivery movement mechanism on each flank surface ( WFr, WFl).

In dressing, when the outer circumferential surface 22 contacts the flank surface WF or the curved bottom WB, the outer circumferential surface whose width is narrowed by the outer tapered surface 21f and the inner tapered surface 21b provided on both sides of the outer peripheral part ( In 22), the octahedral single crystal diamond abrasive grain (4) is mainly dressed. Therefore, high-precision dressing can be performed in accordance with the shape of the screw-shaped grinding stone W that has been elaborately worked. In addition, since a plurality of octahedral single crystal diamond abrasive grains 4 are arranged in the circumferential direction on the outer circumferential surface 22, the octahedral single crystal diamond abrasive grains 4 mainly perform dressing to prevent the small-diameter diamond abrasive grains 31 from falling off. Further, it is possible to prevent the wheel 2 itself from being damaged.

(Comparison data with conventional)

As shown in Fig. 17, in the case of dressing using a conventional dresser, and in the case of dressing the dresser of the present embodiment in which octahedral single crystal diamond abrasive grains are arranged on the outer circumferential surface, the conventional dressing was possible 900 times. The electrodeposition diamond dresser 1 for this molding can be dressed more than 1600 times, and durability of about 1.8 times was recognized.

As is apparent from the above description, the electrodeposition diamond dresser 1 for shaping a screw-type grindstone for gear grinding in this embodiment is an outer circumferential surface of the electrodeposition diamond dresser 1 for shaping a screw-type grindstone for gear grinding. A wheel (2) made of tempered steel that is formed in a disk shape with an outer taper surface (21f) and an inner taper surface (21b) on both sides of the outer circumference so as to be thinner toward 22) and is driven to rotate around the rotation axis CL, and the outer taper surface (21f), a diamond abrasive grain layer 3 extending in a band shape with a predetermined width to the outer peripheral edge portion of the inner tapered surface 21b, and having a plurality of small-diameter diamond abrasive grains 31 plated on the electroplating layer 32, A plurality of mounting grooves 5 formed parallel to the rotational axis CL on the outer circumferential surface 22 of the wheel 2 and having both wall surfaces 51a and 51b in the groove forming a predetermined angle, and a small particle diameter diamond abrasive grain 31 It is formed in a large granular shape and has two base end-side Miller index surfaces (M1, M2) equal to a predetermined angle [mounting crystal planes (octahedral crystal planes oc1, oc2)], and two proximal end-side Miller index surfaces (M1, M2) are both in the groove When mounted on the wall surfaces 51a, 51b, the surface parallel to the outer peripheral surface 22 of the wheel 2 contains an octahedral single crystal diamond abrasive grain 4, which is a crystal that does not become a cleavage surface CS, and each octahedral single crystal diamond The abrasive grain 4 is plated with an electroplating layer 32 on both wall surfaces 51a and 51b in the groove of the mounting groove 5 of the wheel 2 in which two base end side Miller water stop surfaces M1 and M2 are plated.

Conventionally, the wheel 2 thinning toward the outer circumferential surface 22 has the outer circumferential surface 22 narrowed by the outer tapered surface 21f and the inner tapered surface 21b installed on both sides of the outer circumferential surface, and a small particle diameter diamond abrasive grain per unit area The number of (31) is small. Therefore, a large dressing load is applied to the small particle diameter diamond abrasive grains 31 arranged on the outer circumferential surface 22. However, on the outer circumferential surface 22 of the wheel 2, a plurality of large granular octahedral single crystal diamond abrasive grains 4 are plated along the circumferential direction, and when dressing, the octahedral single crystal diamond abrasive grain 4 is mainly subjected to dressing. . Therefore, the octahedral single crystal diamond abrasive grain 4 reduces the load applied to the diamond abrasive grain layer 3, prevents the small-diameter diamond abrasive grain 31 from falling off, and further prevents damage to the wheel 2 itself, as a dresser. Life can be extended.

In addition, on the outer circumferential surface 22 of the wheel 2, a plurality of mounting grooves 5 having both wall surfaces 51a and 51b in the groove forming a predetermined angle of 110° are formed in parallel with the rotation axis CL, and an octahedral single crystal diamond abrasive grain (4) is the two base end side Miller index surfaces M1 and M2 equal to a predetermined angle of 110° of both wall surfaces 51a and 51b in the groove, and the surface parallel to the outer peripheral surface 22 of the wheel 2 is the cleavage surface CS ), plating is attached to both wall surfaces 51a and 51b in the groove. Therefore, the octahedral single crystal diamond abrasive grains 4 are difficult to crush and are firmly fixed to the wheel 2, thereby extending the life of the dresser.

The octahedral single crystal diamond abrasive grain 4 is 110° in the octahedral single crystal diamond abrasive grain 4 on both walls 51a and 51b in the groove of the mounting groove 5 in which the groove line 52 is parallel to the rotation axis CL. It is firmly fixed in two base end-side Miller index {1, 1, 1} planes M1, M2 as mounting crystal planes adjacent to the ridge line 41 at an angle. Therefore, at the time of dressing, the force by the dressing load from the circumferential and radial directions applied to the octahedral single crystal diamond abrasive grain 4 is applied to both wall surfaces 51a and 51b in the groove of the wheel 2, and the plating layer 32 Thus, the octahedral single crystal diamond abrasive grains 4 are reliably plated. Thereby, damage to the diamond abrasive layer 3 can be prevented, and the service life as a dresser can be extended.

The octahedral single crystal diamond abrasive grain 4 tends to be fragile due to its cleavage, with respect to the force acting parallel to 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 Miller index {1) on both 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 fixed in 1, 1} planes (M1, M2). Therefore, since the circumferential direction of the wheel 2 subjected to a large dressing load is at an angle of 35° with respect to the mirror index {1, 1, 1} planes (H1, H2) on the head side where dressing is performed, the octahedral single crystal diamond abrasive grains (4) is hard to break and can maintain a long service life as a dresser.

In addition, the octahedral single crystal diamond abrasive grain 4 has two proximal end-side Miller indexes {1, 1, 1} planes (M1, M2) and two head-side mirror indexes {1, 1, 1} planes (H1, H2) The crossing tops 42 and 43 are covered with a plating layer 32 and plated. Therefore, the octahedral single crystal diamond abrasive grain 4 has a structure that is difficult to come off from the mounting groove 5. Thereby, damage to the wheel 2 itself due to the detachment of the octahedral single crystal diamond abrasive grain 4 can be prevented, and the life of the dresser capable of dressing using the octahedral single crystal diamond abrasive grain 4 can be extended.

In addition, the load applied to the small-diameter diamond abrasive grain 31 of the outer peripheral surface 22 of the wheel 2 is reduced by the octahedral single crystal diamond abrasive grain 4, so that damage to the wheel 2 itself is conventionally achieved. This is prevented. Then, the small particle diameter diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are plated onto the wheel 2 by a plating layer 32. Therefore, by peeling the plating layer 32 with a release agent or the like, the small-diameter diamond abrasive grains 31 and the octahedral single crystal diamond grains 4 are removed from the wheel 2, and the used wheel 2 without damage is used as a new dresser. It can be easily reproduced.

In addition, on the outer circumferential surface 22 of the wheel 2 narrowed by the outer tapered surface 21f and the inner tapered surface 21b installed on both sides of the outer circumferential portion of the wheel 2 thinning toward the outer circumference, it is arranged along the circumferential direction. A plurality of octahedral single crystal diamond abrasive grains 4 are provided. Therefore, the flank surface WF or the curved bottom WB formed in the hole of the threaded grindstone W by the octahedral single crystal diamond abrasive grain 4 can be dressed with high precision.

Further, on the outer circumferential surface 22 of the wheel 2, between the plurality of octahedral single crystal diamond abrasive grains 4, the diamond abrasive grains 31 having a small particle diameter are plated by a plating layer 32.

Accordingly, it is possible to reliably prevent the outer peripheral surface 22 of the wheel 2 from being damaged by the small particle diameter diamond abrasive grains 31 plated between the octahedral single crystal diamond abrasive grains 4.

Two proximal side mirror indices {1, 1, 1} planes (M1, M2) and two proximal side mirror indices {1, 1, 1} planes (M1, M2) and two head-side Miller indices facing each other The top portions 42 and 43 at which the {1, 1, 1} surfaces H1 and H2 intersect are disposed at a position 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 of the octahedral single crystal diamond abrasive grains 4 has two proximal end-side Miller indexes {1, 1, 1} planes (M1, M2) and two head-side Miller indexes {1, 1, 1} planes (H1). The tops 42 and 43 at which the H2 intersects are disposed at a position closer to the rotational axis CL side than the outer peripheral surface 22 in the radial direction of the wheel 2. Therefore, each of the octahedral single crystal diamond abrasive grains 4 can be stably fixed in a state where more than half of them are inserted into the respective mounting grooves 5, and the octahedral single crystal diamond abrasive grains 4 are formed on the outer circumferential surface of the wheel 2 ( It is difficult to fall off from 22) and can be used as a dresser with a long life.

The small particle diameter diamond abrasive grains 31 have a particle size of #20/30 to #100/120, and the octahedral single crystal diamond abrasive grains 4 have a grain size of #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 suitable for the protection of the small-particle diamond abrasive grains 31 constituting the diamond abrasive grain layer 3, thereby making a dresser with a long life. .

The manufacturing method of the electrodeposition diamond dresser (1) for shaping the screw-type grinding wheel (W) for gear grinding is to have an outer taper surface (21f) and an inner taper surface (21b) on both sides of the outer peripheral portion so as to become thinner toward the outer peripheral surface (22). The wheel formation process of forming a tempered and forced wheel 2 in a disk shape, and the groove line 52 extends along the direction of the rotation axis CL of the wheel 2, and both wall surfaces 51a and 51b in the opposite groove are 110° A mounting groove forming step of forming a plurality of mounting grooves 5 forming an angle of at predetermined intervals on the outer peripheral surface 22 of the wheel 2, and both wall surfaces 51a, 51b in the grooves of each mounting groove 5 On the two proximal side Miller index {1, 1, 1} planes (M1, M2) adjacent to the ridge line 41 by forming an angle of 110° in the octahedral single crystal diamond abrasive grain (4), the octahedral single crystal diamond grain The octahedral single crystal diamond abrasive grain bonding step of bonding (4) with the adhesive 6, and the outer peripheral edge portion of the outer tapered surface 21f and the inner tapered surface 21b of the wheel 2 in a band shape with a predetermined width. A diamond abrasive contact step of bringing a plurality of small-diameter diamond abrasive grains 31 into contact with the extended range (the outer band-shaped portion 25f, the inner band-shaped portion 25b) and the outer circumferential surface 22, and the octahedral single crystal diamond abrasive grain 4 The outer circumferential surface 22 to which the small particle diameter diamond abrasive grains 31 are adhered to each other, and the outer tapered surface 21f and the inner tapered surface 21b to which the small particle diameter diamond abrasive grains 31 are in contact are extended in a strip shape (outer band On the mold portion 25f, the inner band portion 25b], an electroplating layer 32 formed by electroplating was formed, and the octahedral single crystal diamond abrasive grain 4 and the small-diameter diamond abrasive grain 31 were attached to the wheel 2 By growing and thickening the electroplating layer 32 formed on the wheel 2 by the first electroplating process and the first electroplating process to apply plating, the two base end side Miller index {1, 1, 1} planes ( M1, M2) and two proximal side Miller indexes {1, 1, 1} planes (M1, M2) and two opposite The second electroplating process of plating and attaching the octahedral single crystal diamond abrasive grains 4 to the outer circumferential surface 22 by covering the tops 43 and 42 where the mirror index {1, 1, 1} planes (H1, H2) on the head side intersect It includes.

According to this, the octahedral single crystal diamond abrasive grains 4 and the groove line 52 are on both wall surfaces 51a and 51b in the grooves of the mounting groove 5 along the rotation axis CL direction at the base end side Miller index {1, 1, 1} Since the surfaces M1 and M2 are aligned and bonded, it can be firmly fixed to the narrow outer peripheral surface 22 of the wheel 2. In addition, the two proximal end-side Miller indexes {1, 1, 1} planes (M1, M2) and the two head-side Miller indexes {1, 1, 1} planes (H1, H2) intersect the apex 43, 42) is covered and plated on the plating layer 32, so that the electrodeposited diamond dresser 1 for molding having a structure in which the octahedral single crystal diamond abrasive grain 4 is difficult to fall out can be easily manufactured.

And, in the electrodeposited diamond dresser 1 for shaping manufactured as described above, since the small-diameter diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are plated and attached to the wheel 2 by the electroplating layer 32, the release agent By peeling off the electroplating layer 32 with a etc., the small-diameter diamond abrasive grain 31 and the octahedral single crystal diamond abrasive grain 4 are removed from the wheel 2, and the small-diameter diamond abrasive grain 31 and the octahedral single crystal diamond abrasive grain 4 This is removed, and it can be easily reproduced as a new dresser using the used wheel 2 without damage.

Incidentally, in the present embodiment, the predetermined width on which the diamond abrasive layer 3 is provided is set to have the outer tapered surface 21f larger than the inner tapered surface 21b, but is not limited thereto. For example, a diamond abrasive layer may be formed on the inner tapered surface and the outer tapered surface with the same predetermined width. In this case, it is not necessary to dress by combining two opposing electrodeposited diamond dressers for shaping, and for example, you may dress the threaded grindstone for gear grinding with one electrodeposited diamond dresser for shaping.

In addition, although the particle size of the small-particle diamond abrasive grains 31 installed in the diamond abrasive grains 3 is set to be #60/80, it is not limited thereto, for example, if the grain size is in the range of #20/30 to #100/120 do.

In addition, 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 thereto. For example, as shown in Fig. 18, a hexahedral single crystal diamond grain (A), a rhomboid dodecahedron monocrystalline diamond grain (C), a hexahedral crystal plane and an octahedral crystal plane and a dodecahedron crystal plane are mixed and appear as a single crystal diamond grain (B- 1), single crystal diamond abrasive grains (B-2, B-3), a mixture of octahedral crystal faces and hexahedral crystal faces (B-2, B-3), single crystal diamond abrasive grains (B-4) and dodecahedron, showing a mixture of crystal faces of dodecahedron and octahedron And single crystal diamond abrasive grains (C-1) formed by mixing crystal planes of hexahedral and hexahedral crystal planes.

Next, with respect to polyhedral single crystal diamond abrasive grains having different crystal shapes, a structure for attaching to the wheel 2 for each crystal shape will be described based on Figs. 19 to 23. Each of the mounting grooves 5, 5d, 5h, 5do, and 5oh in the wheel 2 has a groove line 52 formed parallel to the rotation axis CL of the wheel. Incidentally, the adhesive and the plating layer are not shown, but are used for fixing to the wheel 2 similarly to the octahedral single crystal diamond abrasive grain [4·(B)].

In the mounting of the hexahedral single crystal diamond abrasive grain (A), as shown in Fig. 19, the mounting groove 5h formed in the wheel 2 is formed so that the angles of both wall surfaces 51ha and 51hb in the opposite groove form 90°. Has been. In addition, the hexahedral single crystal diamond abrasive grain (A) has a corner formed by an angle of 90° by two crystal planes (Miller index {1, 0, 0} plane, he) as mounting crystal planes facing each other with a ridge line therebetween. It is adhered and plated according to the groove line 52 of the mounting groove 5h. The cleavage surface 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 grain A is held so that the cleavage surface CS is at 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 grain A is in contact with the outer circumferential surface 22 of the wheel 2 in the case where the mounting groove 5h is not formed at the center position where the hexahedral single crystal diamond abrasive grain A is mounted. The imaginary plane and the cleavage surface CS of the hexahedral single crystal diamond abrasive grain A are positioned so that they intersect at an angle of 45° instead of parallel.

In addition, in the mounting of the rhomboid dodecahedron single crystal diamond abrasive grain (C), as shown in Fig. 20, the mounting groove 5d formed in the wheel 2 is formed on both walls 51da and 51db in the facing groove. It has curved bottom surfaces 51dab and 51dbb forming a predetermined angle of 120° in the curved bottom, and vertical surfaces 51dav and 51dbv continuously rising from the upper end of the curved bottoms 51dab and 51dbb to the outer circumferential surface 22. . In addition, the rhomboid dodecahedron single crystal diamond abrasive grains C are two base end-side crystal faces as mounting crystal faces facing each other with a ridge line RL (see Fig. 18) therebetween (for example, Miller index (1, 1, 0) Align the corners of which the plane do1 and the Miller index (1, 0, 1) plane do2] form an angle of 120° with the groove line 52 of the mounting groove 5d, and the crystal plane do perpendicular to the vertical plane 51dav, 51dbv) and plated. Two sides S1, S2 formed by two crystal planes do5 and do6 perpendicular to the two crystal planes do3 and do4 on the head side opposite to the crystal planes do1 and do2 on the base end side are positioned closer to the rotation axis CL than the outer circumferential surface 22. It is configured to be. And, as the two proximal end-side crystal planes, the Miller index (1, 1, 0) plane do1 and the Miller index (1, 0, 1) plane do2 were used, but are not limited thereto. For example, the Miller index (1, 1, Two crystal planes on the proximal end side may be composed of a 0) plane and a Miller index (0, 1, 1) plane. The cleavage surface (CS) of the rhomboid dodecahedron single crystal diamond abrasive grain (C) is the bottom of the triangular pyramid in the case where the top of the three crystal planes do intersects as a vertex, and the triangular pyramid having the same length of the three hypotenuses extending from the vertex is considered. It corresponds to the plane of an equilateral triangle formed by the plane (see Fig. 18). The rhomboid dodecahedron single crystal diamond abrasive grain C is held so that the cleavage surface CS is inclined with respect to the outer peripheral surface 22 of the wheel 2.

In addition, in the mounting 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, as shown in Fig. 21, the mounting groove 5oh formed in the wheel 2 is, Both walls (51oha, 51ohb) in the opposing groove are curved bottoms (51ohab, 51ohbb) forming 110° in the curved bottom of the groove, and vertical surfaces (51ohav, 51ohbv) rising from the top of the curved bottoms (51ohab, 51ohbb) to the outer circumferential surface (22). ).

In the single crystal diamond abrasive grains (B-2, B-3) in which the octahedral crystal plane oc and the hexahedral crystal plane he appear, as shown in Fig. 21, the crystal planes oc1 and oc2 of the octahedron are two crystal planes on the base end side of the mounting groove 5oh. Fit the curved bottom (51ohab, 51ohbb), and fix the hexahedral crystal plane he to the vertical plane (51ohav, 51ohbv). Two sides formed by two crystal planes oc1 and oc3 on the head side opposite to the crystal plane oc3 on the head side and oc4, and the two sides formed by he1 and he2, which are perpendicular to the crystal plane at the base end side, are located closer to the rotation axis CL than the outer circumferential surface 22. It is configured to be. In the case of single crystal diamond 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 surface is a plane parallel to the crystal plane oc of the octahedron, and the single crystal diamond abrasive grains (B-2, B-3) in which the crystal plane oc of the octahedron and the crystal plane he of the hexahedron appear are with respect to the outer peripheral surface 22 of the wheel 2 It is maintained so that the cleavage surface is inclined.

In addition, in the crystal plane of a diamond single crystal, the Miller index {1, 1, 1} plane constituting the crystal plane oc of the octahedron has a higher hardness than the Miller index {1, 0, 0} plane constituting the crystal plane he of the hexahedron. Therefore, as shown in Fig. 21, by mounting the crystal plane oc of the octahedron on the opposite side to the mounting groove 5oh side (outside the radial direction of the wheel 2), the Miller index {1, 1, 1} plane with high hardness is Can be used to dress. Thereby, the progress of abrasion 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 can be delayed, and a dresser with a long life can be obtained.

In the mounting of the single crystal diamond abrasive grain (B-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron and the crystal plane he of a hexahedron are shown, as shown in Fig. 22, a mounting groove 5doh formed in the wheel 2 Silver, opposite walls 51doha and 51dohb in the groove are curved bottoms 51dohab and 51dohbb forming 110° in the curved bottom of the groove, vertical surfaces 51dohav and 51dohbv rising up to the outer circumferential surface 22, and curved bottoms 51dohab and 51dohbb It is formed between the upper end of) and the lower end of the vertical surfaces 51dohav, 51dohbv, and has two median slopes 51doham and 51dohbm forming 71°.

In addition, the single crystal diamond abrasive grains (B-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron and the crystal plane he of the hexahedron appear are the crystal planes oc1 and oc2 of the octahedron as two crystal planes on the proximal end side of the mounting groove (5doh). Fit to the curved bottom (51dohab, 51dohbb), and fix the hexahedral crystal plane he to the vertical planes (51dohav, 51dohbv). The sides Si1 and Si2 formed by the crystal planes do of two adjacent dodecahedrons are aligned with the median slopes 51doham and 51dohbm, respectively. The two sides Shd1 and Shd2 (see Fig. 22) formed by the crystal plane he of the hexahedron and the crystal plane do of the dodecahedron are configured to be closer to the rotation axis CL than the outer peripheral surface 22. In the single crystal diamond abrasive grain (B-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron and the crystal plane he of a hexahedron appear, the crystal planes used for dressing are mainly the crystal plane do of the dodecahedron and the crystal plane oc of the octahedron. The single crystal diamond abrasive grains (B-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron and the crystal plane he of the hexahedron appear are inclined with respect to the outer circumferential surface 22 of the wheel 2 at any cleavage surface of these crystals. It is kept to be in a state.

In addition, in the crystal plane of a diamond single crystal, the Miller index {1, 1, 1} plane constituting the crystal plane oc of the octahedron and the Miller index {1, 1, 0} plane constituting the crystal plane do of the dodecahedron are the crystal plane he The hardness is higher than that of the Miller index {1, 0, 0} plane constituting the. Therefore, as shown in Fig. 22, the Miller index {1, 1, 1} plane of the crystal plane oc of the octahedron and the Miller index {1, 1, 0} plane of the crystal plane do of the dodecahedron are on the mounting groove 5doh side. By attaching it to the opposite side (outside the radial direction of the wheel 2), it is possible to dress using crystal planes (oc, do) having high hardness. Thereby, the progress of abrasion of the single crystal diamond abrasive grain (B-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron and the crystal plane he of the hexahedron appear can be delayed, thereby making it possible to obtain a dresser with a long life.

In the attachment of the single crystal diamond abrasive grain (B-4) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron appear, as shown in Fig. 23, the mounting groove 5do formed in the wheel 2 is the amount in the facing groove. The wall surfaces 51doa and 51dob are curved bottom surfaces 51doab and 51dobb forming 110° in the grooved bottom, and two upper slopes formed at an angle forming 71° facing each other, continuous to the upper end of the curved bottom surfaces 51doab and 51dobb (51doau, 51dobu).

The single crystal diamond abrasive grain (B-4) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane oc of the octahedron are shown is the crystal planes oc1 and oc2 of the octahedron as two crystal planes on the proximal end side, and the curved bottom surfaces (51doab, 51dobb) of the mounting groove (5do) Adheres to The sides Si1 and Si2 formed by the crystal plane do of two adjacent dodecahedrons are aligned with the upper slopes 51doau and 51dobu, respectively. The two top portions AP1 and AP2 (see FIG. 23) formed by the four dodecahedron crystal planes 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 rhomboid dodecahedron crystal surface do and the octahedral crystal surface oc appear are held so that any cleavage surface of these crystals is inclined with respect to the outer peripheral surface 22 of the wheel 2.

The mounting of the single crystal diamond abrasive grain (C-1) in which the crystal plane do of the rhomboid dodecahedron and the crystal plane he of the hexahedron appear is in accordance with the rhomboid dodecahedron single crystal diamond abrasive grain (C), and the description is omitted.

In addition, although the particle size of the octahedral single crystal diamond abrasive grain 4 is set to #16/18, it is not limited thereto. For example, the particle size in the range of #12/14 to #60/80 may be sufficient. Preferably, when the small-diameter diamond abrasive grain is large #20/30, the octahedral single crystal diamond abrasive grain is also large, #12/14 is used. .

In addition, 80 octahedral single crystal diamond abrasive grains 4 are arranged on the outer peripheral surface 22 of the wheel 2, but the present invention is not limited thereto. Small particle diameter of the diamond abrasive layer Depending on the size (particle size) of the diamond abrasive grains or the length of the outer circumferential surface of the wheel, an arbitrary number, for example, 70 or 100 may be determined and arranged.

In addition, although the plating adhesion of the small particle diameter diamond abrasive grains and the polyhedral single crystal diamond abrasive grains was made by electroplating, it is not limited thereto. For example, electroless plating may be used, or a plating layer may be formed by electroplating and electroless plating, and small-particle diameter diamond abrasive grains and polyhedral single crystal diamond abrasive grains may be plated.

In addition, although the adhesive 6 was used as a non-conductive adhesive, the present invention is not limited thereto, and may be, for example, a conductive adhesive. As the conductive adhesive, for example, an epoxy resin adhesive mixed with a conductive filler can be used. Examples of the conductive filler include carbon-based fillers such as carbon black and graphite, and metallic fillers such as Ni and Cu powder. When the octahedral single crystal diamond abrasive grains are adhered with a conductive adhesive, the growth of the electroplating layer starts from the conductive adhesive that adheres the octahedral single crystal diamond abrasive grains, and no gap is generated between the octahedral single crystal diamond abrasive grains and the electroplating layer. Thereby, the fixing by the electroplating layer can be made stronger.

As described above, the specific configuration stated in the above-described embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration, and various aspects (態樣) can be adopted.

(Industrial availability)

It is used in electrodeposited diamond dressers for shaping threaded grindstones for gear grinding that require high precision and long life.

1: Electrodeposition diamond dresser for molding
2: wheel
21: tapered surface
21f: outer tapered surface
21r: inner tapered side
22: outer peripheral surface
25f: Outer belt-shaped part (band-shaped range)
25b: inner band-shaped portion (band-shaped range)
26: outer peripheral edge portion
3: diamond abrasive layer
31: small particle diameter diamond abrasive
32: electroplating layer (plating layer)
4: Octahedral single crystal diamond abrasive grains (polyhedral single crystal diamond abrasive grains)
41: ridge
42: top
43: top
5: mounting groove
51a: both walls in the groove
51b: both walls in the groove
52: Home line
6: adhesive
CL: axis of rotation
do1, do2: crystal planes of dodecahedron (mounting crystal planes)
oc1, oc2: crystal plane of octahedron (mounting crystal plane)
H1, H2: Miller index {1, 1, 1} on the head side
M1, M2: Mirror index {1, 1, 1} plane on the base end side (mounting crystal plane)

Claims (10)

A wheel made of tempered steel that is formed in a disc shape having tapered surfaces on both sides of the outer circumferential portion so as to be thin toward the outer circumferential surface and is driven to rotate around a rotation axis;
A diamond abrasive layer extending in a band shape with a predetermined width to an outer peripheral edge portion of the tapered surface, and having a plurality of small particle diameter diamond abrasive grains plated by a plating layer;
A plurality of mounting grooves formed parallel to the rotation axis on the outer circumferential surface of the wheel and having both wall surfaces of the grooves forming a predetermined angle; And
When formed in a granular shape larger than the small particle diameter diamond abrasive grains, has a mounting crystal surface equal to the predetermined angle, and when the mounting crystal surface is installed on both wall surfaces in the groove, a surface parallel to the outer circumferential surface of the wheel is a cleavage surface A plurality of polyhedral single crystal diamond abrasive grains, which are crystals that do not become (劈開面);
Including,
In each of the polyhedral single crystal diamond abrasive grains, the mounting crystal surface is plated by the plating layer on both walls of the groove in the mounting groove of the wheel,
On the outer circumferential surface of the wheel, between the plurality of polyhedral single crystal diamond abrasive grains, the small-diameter diamond abrasive grains are plated by the plating layer,
Electro-deposited diamond dresser for shaping threaded grindstones for gear grinding. The method of claim 1,
The plurality of polyhedral single crystal diamond abrasive grains are a plurality of octahedral single crystal diamond abrasive grains,
The mounting crystal plane is an angle of 110° in the octahedral single crystal diamond abrasive grains, and two proximal end-side Miller index {1, 1, 1} planes adjacent to each other on a ridge line,
In the wheel, a plurality of mounting grooves having a groove line extending in the direction of the rotation axis and having both wall surfaces in the opposite grooves forming 110° are disposed on the outer circumferential surface,
Both wall surfaces of the respective mounting grooves in the grooves and the two base end side Miller index {1, 1, 1} surfaces of the respective octahedral single crystal diamond abrasive grains are adhered with an adhesive,
The plating layer includes the two base end side mirror indexes {1, 1, 1} planes, and the two base end side mirror indexes {1, 1, 1} planes and two head side mirror indexes facing each other. An electrodeposited diamond dresser for shaping a screw-type grindstone for gear grinding, wherein the octahedral single crystal diamond abrasive grains are plated onto the outer circumferential surface by covering a top portion where {1, 1, 1} surfaces intersect. delete The method of claim 1,
The plurality of polyhedral single crystal diamond abrasive grains are a plurality of dodecahedral single crystal diamond abrasive grains,
The mounting crystal planes are two base end side crystal planes facing each other at an angle of 120° with a ridge line appearing on the dodecahedral single crystal diamond abrasive grains interposed therebetween, and are continuous to the base end side crystal planes, respectively, and the dodecahedral single crystal diamond abrasive grains are attached to the It is composed of two vertical surfaces that are vertically arranged when mounted in the groove,
In the wheel, a plurality of mounting grooves having a groove line extending in the direction of the rotation axis and having both wall surfaces in the opposite grooves forming 120° are disposed on the outer circumferential surface,
Both wall surfaces of the respective mounting grooves in the groove and the two base end-side crystal surfaces of the respective dodecahedral single crystal diamond abrasive grains are adhered with an adhesive,
The plating layer covers the two head-side crystal faces facing each other with respect to the two base end-side crystal faces, and two sides where the two vertical faces intersect, so that the dodecahedral single crystal diamond abrasive grains are plated and attached to the outer peripheral surface. Electrodeposited diamond dresser for shaping of threaded grindstones. The method of claim 4,
An electrodeposition diamond for shaping a screw-shaped grindstone for gear grinding, wherein the transition between the two head-side crystal surfaces and the two vertical surfaces is disposed closer to the rotation axis side than the outer circumferential surface in the radial direction of the wheel. Dresser. The method of claim 2,
The two proximal side mirror indexes {1, 1, 1} planes and the two proximal end side mirror indexes {1, 1, 1} planes and the two head-side mirror indexes {1, 1, 1} facing each other An electrodeposition diamond dresser for shaping a screw-type grindstone for gear grinding, wherein a top portion crossing the surface is disposed at a position closer to the rotation axis side than the outer peripheral surface in the radial direction of the wheel. The method according to any one of claims 1, 2, 4, and 5,
The particle size of the small-diameter diamond abrasive grains is #20/30 to #100/120, and the polyhedral single crystal diamond grains have a grain size of #12/14 to #60/80, an electrodeposited diamond dresser for shaping screw-type grinding wheels for gear grinding . The method of claim 6,
The particle size of the small-diameter diamond abrasive grains is #20/30 to #100/120, and the polyhedral single crystal diamond grains have a grain size of #12/14 to #60/80, an electrodeposited diamond dresser for shaping screw-type grinding wheels for gear grinding . A wheel forming process of forming a tempered steel wheel in a disk shape having tapered surfaces on both sides of the outer circumference so as to become thinner toward the outer circumference;
A mounting groove forming process of forming a plurality of mounting grooves in which a groove line extends along a direction of a rotation axis of the wheel and both wall surfaces of the opposite grooves form a 110° angle on an outer peripheral surface of the wheel at predetermined intervals;
The octahedral single crystal diamond in two proximal end-side Miller index {1, 1, 1} planes adjacent to each other at a ridge line by forming an angle of 110° in the octahedral single crystal diamond abrasive grain on both walls of the respective mounting grooves. An octahedral single crystal diamond abrasive grain bonding step of bonding the abrasive grains with an adhesive;
A diamond abrasive contacting step of contacting a plurality of small-diameter diamond abrasive grains with a range extending in a band shape with a predetermined width to an outer peripheral edge portion of the tapered surface of the wheel and contacting the outer peripheral surface thereof; And
A plating layer formed by plating is formed in a range extending in the strip shape of the outer circumferential surface to which the octahedral single crystal diamond abrasive grains are adhered and the small-diameter diamond abrasive grains are in contact, and the tapered surface to which the small-diameter diamond abrasive grains are in contact, The small particle diameter diamond abrasive grains are plated on the outer circumferential surface and in a range extending in the strip shape, and the octahedral single crystal diamond abrasive grains are coated with the two base end sides, the Miller index {1, 1, 1} plane, and the two base end sides. A plating step of plating and attaching to the outer circumferential surface by covering a top portion where the Miller index {1, 1, 1} surface and the two head-side Miller index {1, 1, 1} surfaces intersecting each other;
A method of manufacturing an electrodeposited diamond dresser for shaping a screw-type grindstone for gear grinding comprising a. The method of claim 9,
In the mounting groove forming step, the depth dimension of each mounting groove is formed at an angle of 110° in each of the octahedral single crystal diamond abrasive grains to be mounted, and two proximal end-side Miller indexes {1, 1, Electrodeposition for shaping a screw-type grindstone for gear grinding, wherein the top portions on the side spaced apart from each other of the surface are further formed to have a depth dimension that can be disposed closer to the rotation axis side than the outer circumferential surface in the radial direction of the wheel How to make a diamond dresser.

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