KR20190055236A - Electrodeposited diamond dresser for forming threaded grinding wheel for gear polishing and method of manufacturing the same - Google Patents

Abstract

The present invention provides an electrodeposited diamond dresser for forming a threaded grinding wheel for gear polishing capable of high precision dressing and having a long life.
A wheel 2 formed in a disc shape having tapered surfaces 21 on both sides of the outer circumferential portion so as to be thinner toward the outer circumferential surface and a plurality of diamond abrasive grains extending to the outer circumferential edge portion of the tapered surface and plated with a plating layer, (3), a plurality of mounting grooves (5) formed on the outer peripheral surface of the wheel and having an in-groove both wall surfaces at a predetermined angle, a plurality of mounting grooves (5) formed in a granular shape larger than the small- And a polyhedral polycrystalline diamond abrasive grains (4) having crystal planes which are parallel to an outer circumferential surface of the wheel when the mounting crystal plane is provided on both of the inner wall surfaces (51a, 51b) In the diamond abrasive grains, the mounting crystal faces are plated with plating layers 32 on both wall surfaces of the grooves of the mounting grooves of the wheel.

Description

Electrodeposited diamond dresser for forming threaded grinding wheel for gear polishing and method of manufacturing the same

The present invention relates to an electro-deposited diamond dresser for forming a thread-like grinding wheel for grinding gears and a method of manufacturing the diamond dresser.

The grinding wheel for grinding gears is a worm type, and a dresser for forming a thread-like shape is particularly required to be sophisticated.

The dresser disclosed in Patent Document 1 has two tapered working surfaces for dressing a flank surface of a threaded grinding wheel and an outer peripheral surface for dressing a valley bottom of a thread of a threaded grinding wheel . Small diameter diamond abrasive grains are formed on these working surfaces.

As a conventional technique, according to Patent Document 1, a pair of dressers are arranged on a rotating shaft with a predetermined length, and each of the dressers uses two tapered working surfaces in contact with the other flank surfaces of the worm-type grindstone.

International Publication No. 2007/000831

However, in Patent Document 1, in order to improve the accuracy of the dressing, the width of the outer peripheral action surface formed by the tapered surfaces of the front and back surfaces of each dresser is narrowed. There is a problem that when the flank surface of the worm-shaped grinding wheel or the valley bottom is dressed on the narrow outer circumferential surface, the diamond abrasive grains are dropped off due to a large contact load and the service life of the dresser is shortened.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the related problems in the related art, and it is an object of the present invention to provide an electrodeposited diamond dresser for forming a threaded grinding wheel for high-precision dressing and a long life.

In order to solve the above-mentioned problems, the constitution of the invention according to claim 1 is the electrodeposited diamond dresser for forming a threaded grinding wheel for grinding a gear, comprising: a disk-like shape having a tapered surface on both sides of an outer circumferential portion, And a plurality of small diamonds of diamond abrasive grains are plated by a plating layer on the circumferential edge portion of the tapered surface at a predetermined width in a strip shape, A plurality of mounting grooves formed on the outer circumferential surface of the wheel so as to be parallel to the rotation axis and having an in-groove both wall surfaces forming a predetermined angle; And has a mounting crystal plane (crystal plane) equal to the predetermined angle, and when the mounting crystal plane is mounted on both walls in the groove, Wherein the surface of the single-crystal diamond abrasive grains is a crystal in which a surface parallel to the outer circumferential surface of the base wheel is not a cleavage plane, And is plated on the wall surface by the plating layer.

The outer circumferential surface of the wheel refers to the outer circumferential surface of the disk-shaped wheel in the case where the mounting grooves are not formed. Further, since the outer circumferential surface of the wheel is a curved surface, it can not be expressed that it is parallel to the planar cleavage surface. However, in comparison with the outer peripheral face of the wheel, the crystal face of the polyhedral single crystal diamond abrasive grains is microscopic, and the outer peripheral face of the wheel is roughly flat in comparison with the crystal face of the polyhedral single crystal diamond abrasive grains. Therefore, in the claims and specification of the present application, the outer circumferential surface of the wheel and the cleaved surface of the polyhedral single crystal diamond abrasive are described using the expression " parallel ".

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

Conventionally, in the wheel thinned toward the outer circumferential surface, the outer circumferential surface is narrowed by the 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 diameter diamond abrasive grains disposed on the outer peripheral surface. However, a plurality of large-sized polyhedral single crystal diamond abrasive grains are plated on the outer peripheral surface of the wheel along the circumferential direction, and when dressing, the polyhedral single crystal diamond abrasive mainly performs dressing. Therefore, it is possible to reduce the load applied to the diamond abrasive grain layer composed of the abrasive grains of the polyhedral single crystal diamond including the small diameter diamond abrasive grains, prevent the abrasion of the small diameter diamond abrasive grains from coming off, .

A plurality of mounting grooves are formed on the outer circumferential surface of the wheel in parallel with the axis of rotation and have a groove at both sides of the grooves. The diamond abrasive grains of the polycrystalline monocrystalline diamond abut against the outer peripheral surface of the wheel Is plated on both wall surfaces in the groove so as not to be a cleaved surface. Therefore, the polyhedral single crystal diamond abrasive grains are difficult to crush and firmly adhered to the wheel, so that the life of the dresser can be prolonged.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the electrodeposited diamond dresser for molding according to an embodiment of the present invention viewed from the back side.
2 is a cross-sectional view taken along line II-II of the electrodeposited diamond dresser for forming in FIG. 1;
3 is an enlarged cross-sectional view of the tapered surface in FIG. 2;
4 is an enlarged view of an outer peripheral portion in FIG. 3; FIG.
5 is a partially enlarged view showing the outer circumferential surface of the electrodepositing diamond dresser for molding from the outside.
FIG. 6 is a partially enlarged view of the outer circumferential surface of the electrodepositing diamond dresser for molding viewed from the side.
7 is a diagram showing a model of an octahedral single crystal diamond abrasive grain.
8 is a flowchart showing a manufacturing procedure of an electrodeposited diamond dresser for molding.
9 is a partially enlarged view showing a step of forming a mounting groove;
10 is a view showing a step of applying an adhesive to a mounting groove.
11 is a view showing a step of adhering an octahedral single crystal diamond abrasive grain to a mounting groove.
12 is a view showing an electroplating bath for forming an electroplating layer on a wheel.
13 is a view showing a step of bringing diamond abrasive grains of small diameters into contact with a wheel.
14 is a view showing a step of forming an electroplating layer and removing surplus small-diameter diamond abrasive grains.
15 is a view showing a step of growing an electroplating layer.
Fig. 16 is a view for explaining a state of dressing the threaded grinding wheel. Fig.
17 is a view comparing the durability of the dressing times of the conventional dresser and the main dresser.
18 is a view showing the kinds of crystal shapes of the polyhedral single crystal diamond abrasive grains.
19 is a view showing a state in which a hexahedral single crystal diamond abrasive grain is mounted in a mounting groove of a wheel;
20 is a view showing a state in which the ridiculous, dodecahedral single crystal diamond abrasive grains are mounted on the mounting grooves of the wheel.
21 is a view showing a state in which a single crystal diamond abrasive grain having a crystal face of a octahedron and a crystal face of a hexahedron is attached to a mounting groove of a wheel;
22 is a view showing a state in which a single crystal diamond abrasive having a crystal face of a rhombic dodecahedron, a crystal face of an octahedron, and a crystal face of a hexahedron is attached to a mounting groove of a wheel.
23 is a view showing a state in which a single crystal diamond abrasive grain having a crystal face of a rhombohedral dodecahedron and a crystal face of an octahedron is attached to a mounting groove of a wheel.

(Embodiments)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an electrodeposited diamond dresser for forming a threaded grinding wheel for gear polishing according to the present invention will be described with reference to the drawings.

1 and 2, the electrodeposited diamond dresser 1 for molding comprises a wheel 2, a diamond abrasive grain layer 3 provided on the wheel 2, and a diamond abrasive grain layer 3 provided on the outer peripheral surface 22 of the wheel 2 Octahedral single crystal diamond abrasive grains (4).

(Wheel)

As shown in Figs. 1 and 2, the wheel 2 is made of, for example, a steel member, and a tapered surface 21 that becomes thinner toward the outer periphery is defined by two front and rear surfaces (a front tapered surface 21f, an inner tapered surface 21b, And is formed in a disc shape. As the tempering force member, for example, hardened steel, forgings (SUJ) and the like are used. The outer tapered surface 21f extends continuously from the surface of the thick disc portion 23 formed in the central portion of the wheel 2 to the outer peripheral surface 22. [ The inner tapered surface 21b is continuously formed on the outer circumferential surface 22 from the surface of the end portion 24 where the step is formed in a direction in which the thickness is thinner than the back surface of the thick disc portion 23 thickly formed in the central portion of the wheel 2. [ . The outer circumferential surface 22 is formed narrowly in the direction along the axis of rotation CL by the outer tapered surface 21f and the inner tapered surface 21b formed so as to become thinner toward the outer periphery (see Figs. 3 and 4) .

The side where the outer tapered surface 21f on which the diamond abrasive grain layer 3 is formed in a band shape with a predetermined width is formed on the wheel 2 is referred to as a front side and the side on which the diamond abrasive layer 3 is formed is narrower than the outer side tapered surface 21f The side where the inner tapered surface 21b in which the diamond abrasive grain layer 3 is formed in strips is formed is called the back side. On the outer tapered surface 21f of the wheel 2, a peripheral band-shaped portion 25f is formed in the outer peripheral edge portion 26 in a band shape with a predetermined width. The inner tapered surface 21b is formed with an inner band-shaped portion 25b at a narrower width than the outer band-shaped portion 25f in the outer peripheral edge portion 26. [ A plurality of small-diameter diamond abrasive grains 31 are formed on the outer band-shaped portion 25f and the inner band-shaped portion 25b with a diamond abrasive layer 3 plated with a plating layer to be described later.

(Diamond abrasive layer)

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

(Mounting groove)

The inner wall surfaces 51a and 51b of the grooves opposed to each other make an angle of 110 DEG and the groove line 52 is parallel to the rotation axis CL direction of the wheel 2 A plurality of mounting grooves 5 (80 positions in this embodiment) are formed. Each of the mounting grooves 5 is secured to each of the octahedral single crystal diamond abrasive grains 4 one by one. As shown in Fig. 7, the octahedral single crystal diamond abrasive grains 4 are octahedron-type octahedrons and have a grain size of, for example, # 16/18. The in-groove both wall surfaces 51a and 51b of the mounting groove 5 shown in Fig. 9 are formed at a predetermined angle of 110 degrees. As shown in Fig. 11, two octagonal miller indices {1, 2, 3, 4, 5, 6, 7, 8, 1, 1} surfaces M1 and M2 are attached to the octagonal single crystal diamond abrasive grains 4 (here, the two base end miller indexes {1, 1, 1} (2), which are disposed on the side of the rotation axis CL (side of the mounting groove 5) of the wheel 2 and bonded to both the in-groove wall surfaces 51a and 51b of the mounting groove 5, , 1, 1} plane, and the two base side miller indices {1, 1, 1} correspond to the "mounting crystal plane". In addition, the head side Miller index {1, 1, 1} face means a face which is opposed to two base end side Miller index {1, 1, 1} faces located on the mounting groove 5 side as a mounting crystal face And the two Miller indices {1, 1, 1} disposed on the opposite side of the groove 5 are referred to.

In this case, when the octahedral monocrystalline diamond abrasive grains 4 are mounted, the mounting grooves 5 are formed so as to have two base end side miller indices { 1, 1, 1} faces M1 and M2 and two head side Miller indexes {1, 1, 1} facing each other with two base side Miller indexes { The tops 42 and 43 at which the planes H1 and H2 intersect (the tops 42 and 43 are represented by coordinates (-1, 0, 0) (See Figs. 7 and 11) at a position nearer to the rotation axis line CL than the outer circumferential surface 22 in the radial direction of the wheel 2. [0064] Fig.

The two base end side Miller indexes {1, 1, 1} faces M1, M2 adjacent to the in-groove wall surfaces 51a, 51b of the groove 5 of the mounting groove 5 and the octahedral single crystal diamond grains 4, And adhered by an adhesive 6. As the adhesive 6, for example, an epoxy resin-based non-conductive adhesive is used.

(Octahedral single crystal diamond abrasive)

The octahedral single crystal diamond abrasive grains 4 are plated on the outer circumferential surface 22 of the wheel 2 in the electroplating layer 32 together with the small diameter diamond abrasive grains 31 (see Figs. 5, 6, and 15). In this case, the electroplating layer 32 has two base side Miller index {1, 1, 1} planes M1, M2 and two base side Miller indexes {1, 1, 1} planes H1, And the octahedral single crystal diamond grains 4 are plated on the outer circumferential surface 22 so as to cover the intersecting tops 42 and 43 (see FIGS. 5, 6, 7 and 15). Thus, the octahedral single crystal diamond abrasive grains 4 are plated on the outer circumferential surface 22 of the wheel 2 by the electroplating layer 32 firmly.

The octahedral monocrystalline diamond abrasive grains 4 shown in Figs. 3 to 6 are formed in such a manner that the octahedral monolithic diamond abrasive grains 4 are not in the shape of an octahedral crystal but are formed in a shape conformed to the surface of a small diameter diamond abrasive grains 31 Respectively. The cleavage plane CS refers to a plane in the direction in which crystals tend to be broken in a specific direction. In the case of the octahedral single crystal diamond 4, the plane parallel to {1, 1, 1} 1, 1, 1} plane]. As shown in Figs. 5 and 6, the octahedral single crystal diamond abrasive grains 4 have facet Miller index {1, 1, 1} planes parallel to the cleavage planes CS on the outer surface. When a portion other than the cleavage plane CS is to be machined, the diamonds are rubbed against each other. Diameter diamond abrasive grains 31 are also arranged between a plurality of octahedral single crystal diamond grains 4 arranged on the outer circumferential surface 22 of the wheel 2. [ The octahedral single crystal diamond abrasive grains 4 are formed on the outer circumferential surface 22 of the wheel 2 in the case where the mounting grooves 5 are not formed on the virtual plane in contact with the center of gravity of the octahedral single crystal diamond grains 4 , The cleaved faces (CS) of the octahedral single crystal diamond abrasive grains (4) are positioned so as to intersect at an angle of 35 degrees instead of parallel.

A center hole 27 is formed in the center of the wheel 2 so as to fit into a centering boss projecting to the shaft end of the drive shaft SFr, SF1 (see Fig. 16). Around the center hole 27 are formed three female thread holes 28 each having a female thread and three bolt holes 29 through which bolts are inserted (see FIGS. 1 and 2).

(Order of manufacturing method)

Next, a method of manufacturing the electrodeposited diamond diamond dresser 1 for forming a threaded grinding wheel for gear polishing will be described below based on Figs. 8 to 15 and the like.

The wheel 2 is formed, for example, in a disc shape by a grinding wheel (a wheel forming process step 101 (hereinafter, the step is abbreviated as "S") (see FIG. The wheel 2 is formed by the tempering forcing member and is formed on the front tapered surface 21f, the inner tapered surface 21b, and the front and rear of the outer periphery, respectively, 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 disc portion 23 formed in the center portion of the wheel 2 to the outer circumferential surface 22. A thick disc portion 23 thickly provided on the center side of the wheel 2 and an end portion 24 formed on the outer periphery of the thick disc portion 23 with a step in the thickness decreasing direction. The inner tapered surface 21b is formed so as to extend continuously from the surface of the end portion where the end portion 24 is thinly formed to the outer peripheral surface 22. [

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

Next, the mounting groove 5 is formed on the outer peripheral surface 22 of the wheel 2 by, for example, wire processing (mounting groove forming step S102) (see Fig. 9). 7 and 9, the mounting groove 5 is formed so that the groove line 52 extends along the direction of the rotation axis CL of the wheel 2 and the in-groove both wall surfaces 51a, (M1, M2) adjacent to each other at the ridge line 41 at an angle of 110 DEG in each of the octahedral single crystal diamond grains 4, The two top portions 42 and 43 at the mutually spaced sides of the wheel 2 are formed in such a depth dimension that they can be arranged closer to the rotation axis CL side than the outer peripheral surface 22 in the radial direction of the wheel 2 11). A plurality of mounting grooves 5 are formed on the outer circumferential surface 22 of the wheel 2 at predetermined intervals (80 positions in the present embodiment).

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

Next, a plurality of small-diameter diamond abrasive grains 31 are brought into contact with the band-shaped portions 25f and 25b of the tapered surface 21 of the wheel 2 and the outer peripheral surface 22 of the wheel 2 Diamond abrasive contact step S104) (see Fig. 13). This contact is made by bringing a plurality of small-diameter diamond abrasive grains 31 accommodated 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 adhered temporarily by electroplating in a nickel solution (first electroplating step S105 (See Figs. 12 and 14). The electroplating bath 7 accommodates, for example, a plating solution 71 in which boric acid, nickel sulfate, nickel chloride or the like is mixed. In the plating liquid 71, a nickel electrode 72 is provided as an anode. And a wheel 2 is assigned as a cathode. The wheel 2 is fastened by the nut 74 to the flange 73a of the conductive support member 73 connected to the terminal of the negative pole and the wheel 2 is fastened to the bottom plate 75 and the bracket made of vinyl chloride And the masking member 77 made of rubber is sandwiched from the upper and lower directions by the mask 76. This electroplating forms an electroplating layer 32 between the small-diameter diamond abrasive grains 31 and the wheel 2 that are in contact with the surface of the wheel 2 and forms the small-diameter diamond abrasive grains 31 on the wheel 2, (See Fig. 14).

Subsequently, surplus small-diameter diamond abrasive grains 31 which are temporarily adhered to the surface of the wheel 2 are removed (surplus small diameter diamond abrasive grain removal step S106) (see Fig. 14). As a result, it is possible to form the diamond abrasive grain layer 3 having high shape accuracy as the abrasive grain layer.

Next, an electroplating layer 32 is further formed on the wheel 2 from which the excess small diameter diamond abrasive grains 31 are removed (second electroplating step S107) (see Fig. 15). The electroplating layer 32 is further grown to form two octagonal miller indices {M1, M2} and two proximal miller indices {M1, M2} in the octahedral single crystal diamond abrasive grains (4) And the top portions 42 and 43 at which the two head side Miller indexes {1, 1, 1} faces H1 and H2 opposed to each other face the {1,1,1} faces M1 and M2 are covered with the octahedral single crystal diamond grains (4) is plated on the outer circumferential surface (22). In this case, the electroplated layer 32 is formed so that the proximal end side of the octahedral single crystal diamond abrasive grains 4 (the side on which the octahedral single crystal diamond abrasive grains 4 are fixed to the wheel 2) is pressed against the outer peripheral surface 22 of the wheel 2 Plating is attached to this book.

(work)

Next, in the case of dressing a threaded grinding wheel (hereinafter referred to as a threaded grinding wheel) W for gear grinding by using the electrodeposited diamond dresser 1 for forming a threaded grinding wheel in the present embodiment Will be briefly described.

First, as shown in Fig. 16, the electrodeposited diamond dresser 1 for molding is mounted on opposite end portions of the two drive shafts SFr and SFl arranged coaxially so as to be relatively nonrotatable by a bolt B or the like . The two electrodepositing diamond dressers 1 (1R, 1L) for molding are disposed so as to face the outer tapered surface 21f provided with the diamond abrasive grain layer 3. Drive torques are transmitted to the drive shafts SFr and SF1 by a drive motor (not shown) through a speed reduction device (not shown) and rotate. The rotational speeds of the drive shafts SFr and SF1 are configured to be changed to an arbitrary main speed (peripheral speed) by a mechanism (mechanism) for switching the gear ratio in the speed reducing device. The two drive shafts SFr and SF1 are included in a proximity and spacing movement mechanism (not shown) spaced apart in the direction of the axis of rotation CL.

The threaded grinding wheel W, which is a subject to be polished, is assembled so as not to rotate relative to a rotation shaft (not shown) which can rotate at a main speed different from that of the drive shafts SFr and SFl. The rotating shafts in which the drive shafts SFr and SF1 and the screw-type grindstone W are assembled are included in a not shown moving mechanism (not shown) which makes the approaching and separating movements parallel to each other. The rotary shaft to which the drive shafts SFr and SF1 and the threaded grinding wheel W are assembled is a delivery shaft that is movable in the axial direction relative to the rotation of the rotary shaft of the threaded grinding wheel W ).

The main electrodeposited diamond dresser 1 and the screw-type grinding wheel W are rotated at a higher speed than the main speed of the forming electrodeposited diamond dresser 1 when the dressing is performed, And are rotated in opposite directions to rotate in the same tangential direction at the contact points. Then, the side face (flank face WF) of the threaded spiral of the threaded grinding wheel W is dressed by approaching the infeed amount by the infeed moving mechanism. The forming electrodeposited diamond dresser 1 and the threaded grinding wheel W are moved relative to each other in the axial direction by a delivery and moving mechanism in synchronization with the rotation of the screw shape of the threaded grinding wheel W, The flank surface WF and the curved bottom WB are continuously dressed. In this case, the infeed amounts of the two forming electrodeposited diamond dressers 1 are synchronized by the infeed moving mechanism, and the feeding and moving amounts of the two forming electrodeposited diamond dressers 1 are set to the respective flank surfaces WFr, WFl).

In the dressing, when the flank surface WF or the curved bottom WB is in contact with the outer peripheral surface 22, the outer taper surface 21f provided on both sides of the outer peripheral portion and the outer peripheral surface narrowed by the inner tapered surface 21b 22), mainly octahedral single crystal diamond abrasive (4) is dressed. Therefore, high-precision dressing can be performed in accordance with the shape of the finely-shaped threaded grinding wheel W. Since a plurality of octahedral single crystal diamond grains 4 are arranged in the circumferential direction on the outer circumferential surface 22, mainly the octahedral single crystal diamond grains 4 are dressed to prevent dropping of the small diameter diamond grains 31 And the wheel 2 itself can be prevented from being damaged.

(Comparative data with the prior art)

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 an octahedral single crystal diamond abrasive grain was arranged on the outer circumferential surface, in the conventional dressing, 900 dressings were able to be dressed, The present electrodepositing diamond dresser 1 for forming can be dressed more than 1,600 times, and durability of about 1.8 times was recognized.

As is apparent from the above description, in the electrodeposited diamond dresser 1 for forming a threaded grinding stone for polishing a gear in the present embodiment, in the electrodeposited diamond dresser 1 for forming a threaded grinding wheel for gear polishing, Shaped wheel having a front tapered surface 21f and an inner tapered surface 21b on both sides of the outer circumferential portion so as to be thinner toward the front taper surface 22, A diamond abrasive grain layer 3 having a plurality of small diameter diamond abrasive grains 31 extending in a strip shape at a peripheral edge portion of the inner tapered surface 21b and plated in the electroplating layer 32, A plurality of mounting grooves 5 formed on the outer circumferential surface 22 of the wheel 2 in parallel with the axis of rotation CL and having both grooves in the groove 51a and 51b at predetermined angles, Is formed in a large granular shape, And the two proximal end side miller expansive surfaces M1 and M2 are mounted on the both side walls 51a and 51b in the grooves with the proximal end side miller exponential surfaces M1 and M2 (the crystal facets oc1 and oc2 of the octahedron) , The octahedral single crystal diamond abrasive grains (4) are crystals in which the plane parallel to the outer circumferential surface (22) of the wheel (2) is not a cleavage plane (CS) The base end side miller expansive surfaces M1 and M2 are plated with the electroplating layer 32 on both side walls 51a and 51b of the groove 2 of the mounting groove 5 of the wheel 2.

The outer peripheral surface 22 of the wheel 2 thinner toward the outer peripheral surface 22 is narrowed by the outer tapered surface 21f and the inner tapered surface 21b provided on both sides of the outer peripheral portion, (31). Therefore, a large dressing load is applied to the small-diameter diamond abrasive grains 31 disposed on the outer circumferential surface 22. However, a plurality of large-sized octahedral single crystal diamond grains 4 are plated on the outer peripheral surface 22 of the wheel 2 along the circumferential direction, and when dressing, the octahedral single crystal diamond grains 4 mainly perform dressing . Therefore, it is possible to reduce the load applied to the diamond abrasive grain layer 3 by the octahedral single crystal diamond abrasive grains 4, prevent the diamond abrasive grains 31 from falling off and prevent the wheel 2 itself from being damaged, The life span can be prolonged.

A plurality of mounting grooves 5 are formed in the outer circumferential surface 22 of the wheel 2 in parallel with the axis of rotation CL and having a groove in the groove 51a and a groove 51b at a predetermined angle of 110 °. The plane parallel to the outer circumferential surface 22 of the wheel 2 is divided into the cleaved planes CS (M1, M2) at two proximal end side miller expansions M1, M2 equal to a predetermined angle 110 deg. Of the both wall surfaces 51a, (Not shown in the drawing). Therefore, the octahedral single crystal diamond abrasive grains 4 are difficult to be crushed and firmly fixed to the wheel 2, so that the life of the dresser can be prolonged.

The octahedral single crystal diamond abrasive grains 4 are formed on the in-groove both wall surfaces 51a and 51b of the groove 5 of the mounting groove 5 in which the groove line 52 is parallel to the rotation axis CL, Is firmly fixed at two base-end-side Miller index {1, 1, 1} planes M1 and M2 as adjacent mounting crystal faces at the ridge line 41 at an angle. Therefore, at the time of dressing, a force due to the dressing load applied to the octahedral single crystal diamond abrasive grains 4 in the circumferential direction and the radial direction acts on the both wall surfaces 51a and 51b in the grooves of the wheel 2, So that the octahedral single crystal diamond abrasive grains 4 are reliably plated. As a result, damage to the diamond abrasive layer 3 is prevented, and the service life of the dresser can be prolonged.

The octahedral single crystal diamond abrasive grains 4 tend to be fragile from the wall characteristics of forces acting parallel to the Miller index {1, 1, 1} plane. However, in the octahedral single crystal diamond abrasive grains 4 of the present embodiment, the grooved line 52 is provided on the in-groove both wall surfaces 51a and 51b of the mounting groove 5 parallel to the rotation axis CL, , 1, 1} planes M1 and M2. Therefore, since the circumferential direction of the wheel 2 to which the large dressing load is applied has an angle of 35 DEG with respect to the head side Miller index {1, 1, 1} faces H1 and H2 for dressing, the octahedral monocrystalline diamond grains (4) is hard to break and the life of the dresser can be kept long.

The octahedral single crystal diamond abrasive grains 4 have two base side Miller indexes {1, 1, 1} faces M1 and M2 and two head side Miller indexes {1, 1, 1} faces H1, The top portions 42 and 43 which intersect with each other are covered with a plating layer 32 to be plated. Therefore, the octahedral single crystal diamond abrasive grains 4 have a structure which is difficult to fall off from the mounting groove 5. [ As a result, it is possible to prevent damage to the wheel 2 itself due to the fall of the octahedral single crystal diamond abrasive grains 4, and to prolong the life of the dresser capable of dressing using the octahedral single crystal diamond abrasive grains 4.

The load applied to the small diameter diamond abrasive grains 31 on the outer circumferential surface 22 of the wheel 2 is reduced by the octahedral single crystal diamond abrasive grains 4 of the wheel 2 so that the damage to the wheel 2 itself . 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 diamond abrasive grains 31 and the octahedral single crystal diamond abrasive grains 4 are removed from the wheel 2 by peeling the plating layer 32 with a stripping agent or the like to remove the damaged wheel 2 that has been used without damage as a new dresser It can be easily reproduced.

The outer tapered surface 21f provided on both sides of the outer peripheral portion of the wheel 2 which is thinned toward the outer periphery and the outer peripheral surface 22 of the wheel 2 narrowed by the inner tapered surface 21b are arranged along the circumferential direction A plurality of octahedral single crystal diamond grains 4 are formed. Therefore, it is possible to dress the flank surface WF and the curved bottom WB formed in the holes of the threaded grinding wheel W with high precision by the octahedral single crystal diamond abrasive grains 4.

A small diameter diamond abrasive grains 31 are plated with a plating layer 32 between a plurality of octahedral single crystal diamond grains 4 on the outer peripheral surface 22 of the wheel 2. [

According to this, it is possible to reliably prevent the outer circumferential surface 22 of the wheel 2 from being damaged by the diamond abrasive grains 31 plated on the surface between the octahedral single crystal diamond abrasive grains 4.

The two base side Miller indexes {1, 1, 1} faces M1 and M2 and the two base side Miller indexes {1, 1, 1} faces M1 and M2 face each other, The tops 42 and 43 at which the {1, 1, 1} planes H1 and H2 intersect are arranged closer to the rotation axis CL than the outer circumferential surface 22 in the radial direction of the wheel 2. [

Each of the octahedral single crystal diamond grains 4 has two base side Miller indexes {1, 1, 1} faces M1 and M2 and two head side Miller indexes {1, 1, 1} faces H1 H2 are arranged closer to the rotation axis CL side than the outer circumferential surface 22 in the radial direction of the wheel 2. The top portions 42, Therefore, each of the octahedral single crystal diamond grains 4 can be stably fixed in a state where more than half of the octagonal single crystal diamond grains 4 are sandwiched in the respective mounting grooves 5, and the octahedral single crystal diamond grains 4 are arranged on the outer circumferential surface 22, so that the dresser having a long life can be obtained.

The particle size of the small diameter diamond abrasive grains 31 is # 20/30 to # 100/120 and the size of the octahedral single crystal diamond abrasive grains 4 is # 12/14 to # 60/80.

This makes it easy to set the octahedral single crystal diamond abrasive grains 4 having a grain size ratio suitable for the protection of the small diameter diamond abrasive grains 31 constituting the diamond abrasive grain layer 3 to make the dresser having a long life .

A method of manufacturing an electrodeposited diamond dresser 1 for forming a threaded grinding wheel for grinding a gear includes the steps of forming a peripheral tapered surface 21f and an inner tapered surface 21b on both sides of the outer peripheral portion 22 so as to be thinner toward the peripheral surface 22 A groove forming step of forming a roughly forced wheel 2 in a disc shape and a groove forming step of forming a grooved both wall surfaces 51a and 51b in which the groove line 52 is extended and grooves are opposed to each other in the direction of the rotation axis CL of the wheel 2, A plurality of mounting grooves 5 are formed at predetermined intervals on the outer circumferential surface 22 of the wheel 2 so as to form a plurality of mounting grooves 5 forming the angles of the grooves 5, (1, 1, 1) planes M1, M2 adjacent to each other at the ridge line 41 at an angle of 110 DEG in the octahedral single crystal diamond abrasive grains 4 on the octahedral single crystal diamond grains 4, (4) is adhered by an adhesive (6), an octahedral monocrystalline diamond abrasive grain adhering step for adhering the outer surface of the wheel (2) (The outer band-shaped portion 25f, the inner band-shaped portion 25b) and the outer peripheral surface 22 that extend in a band-like shape in a band width at a predetermined width on the outer peripheral edge portion of the inner tapered surface 21f and the inner tapered surface 21b, A step of contacting the diamond abrasive grains with the small diameter diamond abrasive grains so as to contact the diamond abrasive grains with the small diameter diamond abrasive grains; An electroplating layer 32 formed by electroplating is formed on a range of the outer tapered surface 21f and the inner tapered surface 21b extending in a band shape (the outer band-shaped portion 25f and the inner band-shaped portion 25b) A first electroplating process for plating the octagonal single 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 process, Thereby forming two proximal-end-side mirrors And the two head side Miller indices {1, 1, 1} faces M1, M2 facing each other and the two head end side Miller indexes { And a second electroplating step of plating the octahedral monocrystalline diamond abrasive grains 4 on the outer circumferential surface 22 so as to cover the top portions 43 and 42 at which the first and second planar surfaces H1 and H2 intersect.

The octahedral single crystal diamond abrasive grains 4 are formed so that the groove line side miller indexes {1, 1, 1} are formed on the in-groove both wall surfaces 51a, 51b of the groove 5 of the groove 5 along the direction of the axis of rotation CL, The surfaces M1 and M2 are adhered and adhered to each other so that they can be firmly fixed to the narrow outer circumferential surface 22 of the wheel 2. [ It is also possible that the two base side Miller indexes {1, 1, 1} planes M1 and M2 and the two head side Miller indexes {1, 1, 1} planes H1, 42 can be covered with the plating layer 32 so that the electrodeposited diamond dresser 1 having a structure in which the octahedral single crystal diamond grains 4 are hard to fall off can be easily manufactured.

Since the diamond abrasive grains 31 and the octahedral single crystal diamond grains 4 are plated on the wheel 2 by the electroplating layer 32 in the electrodeposited diamond dresser 1 thus manufactured, 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 diamond grains 4 are removed by peeling off the electroplating layer 32, And can be easily regenerated as a new dresser by using the used wheel 2 which is free from damage.

In the present embodiment, the predetermined width at which the diamond abrasive layer 3 is provided is larger than the inner tapered surface 21b, but the present invention is not limited thereto. For example, a diamond abrasive grain 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 combine the two opposing electrodepositing diamond dressers for dressing. For example, the threaded grinding wheel for gear polishing may be dressed with one electrodepositing diamond dresser for molding.

The grain size of the small-diameter diamond abrasive grains 31 provided in the diamond abrasive grain layer 3 is # 60/80, but the present invention is not limited to this. For example, the grain size in the range of # 20/30 to # 100 / do.

In the embodiment, the polyhedral single crystal diamond abrasive is an octahedral single crystal diamond abrasive [4 (B)], but the present invention is not limited thereto. For example, as shown in Fig. 18, there are a hexagonal single crystal diamond abrasive grain (A), a rhombohedral single crystal diamond abrasive (C), a single crystal diamond abrasive grain (B- 1), single crystal diamond abrasive grains (B-2 and B-3) in which the crystal faces of the octahedron and the hexahedron are mixed, single crystal diamond abrasive grains (B-4) and And a single crystal diamond abrasive (C-1) in which a crystal face of a hexagonal body and a crystal face of a hexagonal body are mixed.

Next, the mounting structure of the crystal to the wheel 2 with respect to the polyhedral single crystal diamond abrasive grains having different crystal forms will be described with reference to Figs. 19 to 23. Fig. Each of the mounting grooves 5, 5d, 5h, 5do and 5oh in the wheel 2 is formed so that the groove line 52 is parallel to the rotation axis CL of the wheel. Although not shown, the adhesive and the plating layer are used for fixing to the wheel 2 in the same manner as the octahedral single crystal diamond abrasive [4 (B)].

19, the mounting groove 5h formed in the wheel 2 is formed such that the angle of the opposite in-groove both wall surfaces 51ha and 51hb is 90 degrees, as shown in Fig. 19, when the hexahedron monocrystalline diamond abrasive grain A is mounted. . The hexagonal single crystal diamond abrasive grain (A) has two crystal planes (Miller index {1, 0, 0} plane he) as a mounting crystal face opposed to each other with a ridge therebetween, And adheres to and adheres to the groove line 52 of the mounting groove 5h. The cleavage plane (CS) of the hexagonal single crystal diamond abrasive grain (A) is a plane parallel to the crystal plane he. The hexagonal single crystal diamond abrasive grains A are held such that the cleaved face CS is at an angle of 45 DEG with respect to the outer peripheral face 22 of the wheel 2. [ In other words, the hexahedral single crystal diamond abrasive grain A is in contact with the outer peripheral 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 grains A are mounted So that the imaginary phase plane and the cleaved plane CS of the hexahedral single crystal diamond abrasive grain A intersect at an angle of 45 degrees instead of parallel.

20, the mounting grooves 5d formed in the wheel 2 are formed such that the opposite in-groove both-wall surfaces 51da and 51db are in contact with the grooves 5d, And has vertical surfaces 51dav and 51dbb extending from the upper end of the curved bottom surfaces 51dab and 51dbb to the outer circumferential surface 22 in succession . The ridgeline-shaped, single crystal diamond abrasive grains (C) have two proximal end side crystal faces (for example, Miller indexes (1,1, 0)) as mounting crystal faces opposed to each other with the ridgeline RL The angle of 120 degrees is set at the angle of 120 degrees with the groove line 52 of the mounting groove 5d and the perpendicular crystal face do becomes the vertical plane 51dav, 51dbv) and adhered and plated. The two sides S1 and S2 formed by the crystal faces do5 and do6 perpendicular to the two head side crystal faces do3 and do4 opposite to the two base side crystal faces do1 and do2 are located closer to the rotation axis CL than the outer peripheral face 22 . Although the two sides of the base side are the do1 and the Miller index (1, 0, 1) do2 on the Miller index (1, 1, 0) surface, 0) plane and the Miller index (0, 1, 1) plane. The cleaved facet CS of the mono-crystalline diamond abrasive grains C has a triangular pyramid shape in which, when considering a triangular pyramid having a vertex at which three crystal faces do intersect and a length of three hypotenuses extending from the vertex of the triangular pyramid, The surface of an equilateral triangle formed by the surface (see FIG. 18). The ridgeline-shaped, single-crystal diamond abrasive grains C are held so that the cleaved surface CS is inclined with respect to the outer peripheral surface 22 of the wheel 2.

In mounting the single crystal diamond abrasives B-2 and B-3 in which the crystal face oc of the octahedron and the crystal face he of the hexahedron appear, the mounting groove 5oh formed in the wheel 2, as shown in Fig. 21, The opposing in-groove both wall surfaces 51oha and 51ohb have grooves 51ohab and 51ohbb forming 110 ° in the grooves and vertical surfaces 51ohav and 51ohbb rising from the tops of the grooves 51ohab and 51ohbb to the outer circumferential surface 22, ).

As shown in Fig. 21, the single crystal diamond abrasive grains (B-2, B-3) having the crystal face oc of the octahedron and the crystal face he of the hexahedron have crystal faces oc1 and oc2 of the octahedron as two base- (51ohab, 51ohbb), and fix the hexahedral crystal surface he to the vertical surface (51ohav, 51ohbv). The two sides Si1 and Si2 formed by the crystal faces he1 and he2 perpendicular to the two head side crystal faces oc1 and oc2 opposite to the two base end side crystal faces oc1 and oc2 are located closer to the rotation axis CL than the outer peripheral face 22 . In the case of the single crystal diamond abrasive (B-2, B-3) where the octahedral face oc and the hexahedron crystal face he are shown, the crystal face used for dressing is the octahedral face oc. The single crystal diamond abrasive grains B-2 and B-3 exhibiting the crystal face oc of the octahedron and the crystal face he of the hexahedron are arranged on the circumferential surface 22 of the wheel 2 so as to be parallel to the crystal face oc of the octahedron, So that the cleaved surface is maintained to be inclined.

Further, the Miller index {1, 1, 1} plane constituting the crystal face oc of the octahedron on the crystal surface of the diamond single crystal is higher in hardness than the Miller index {1, 0, 0} plane constituting the crystal face he of the hexahedron. Therefore, as shown in Fig. 21, by attaching the crystal face oc of the octahedron to the opposite side of the mounting groove 5oh side (radially outward of the wheel 2), the Miller index {1, 1, 1} Can be used for dressing. Thus, the progress of wear of the single crystal diamond abrasive grains (B-2, B-3) exhibiting the crystal face oc of the octahedron and the crystal face he of the hexahedron is delayed, thereby making the dresser of long life.

In the mounting of the single crystal diamond abrasive grain (B-1) having the crystal face do, the octagonal crystal face oc and the hexahedron crystal face he of the rhombohedral dodecahedron as shown in Fig. 22, the mounting groove 5doh formed on the wheel 2, 51dohab and 51dohbb forming the opposing grooves 51doha and 51dohb are formed at 110 ° in the groove curvature and the vertical surfaces 51dohav and 51dohbv rising up to the outer circumferential surface 22 and the groove bottoms 51dohab and 51dohbb (51doham, 51dohbm) formed at an angle of 71 ° between the upper end of the vertical plane (51dohav, 51dohbv) and the lower end of the vertical plane (51dohav, 51dohbv).

The single crystal diamond abrasive (B-1) having the crystal face do, the octagonal crystal face oc and the hexahedron crystal face he of the rugged dodecahedron is characterized in that the crystal faces oc1 and oc2 of the octahedron are two proximal side crystal faces, (51dohab, 51dohbb), and fix the hexahedron crystal he according to the vertical plane (51dohav, 51dohbv). In the intermediate slope (51doham, 51dohbm), sides Si1 and Si2 formed by the crystal face do of two adjacent gypsum bodies are to be matched, respectively. The two sides Shd1 and Shd2 (see FIG. 22) formed by the hexagonal crystal he and the dodecahedral crystal do are located closer to the rotation axis CL than the outer circumferential surface 22. In the single crystal diamond abrasive (B-1) showing the crystal face do and the octahedral crystal face oc and the hexahedron crystal face he, the crystal face used for dressing is mainly the crystal face do of the dodecahedron and the crystal face oc of the octahedron. The single crystal diamond abrasive grain (B-1) having the crystal face do, the octahedral crystal face oc and the hexahedron crystal face he of the optically active dodecahedron has a cleavage plane inclined with respect to the outer peripheral face 22 of the wheel 2 State.

The Miller index {1, 1, 0} plane constituting the Miller index {1, 1, 1} plane and the crystal face do of the dodecahedron constituting the crystal face oc of the octahedron on the crystal face of the diamond single crystal is the crystal face he , The hardness is higher than the Miller index {1, 0, 0} Therefore, as shown in Fig. 22, the Miller index {1,1, 1} plane of the octahedron crystal face oc and the Miller index {1,1,0} plane of the dodecahedron do do not match the (Radially outer side of the wheel 2), the dressing can be performed by using the high hardness crystal faces oc, do. As a result, the progress of the wear of the single crystal diamond abrasive (B-1) in which the crystal face do, the crystal face oc of the octahedron and the crystal face he of the hexahedron appear is delayed, thereby making the dresser of long life.

In the attachment of the single crystal diamond abrasive grain (B-4) having the crystal face do and the octahedral crystal face oc of the rhombohedral dodecahedron, the mounting groove 5do formed in the wheel 2 as shown in Fig. 23, The wall surfaces 51doa and 51dob are continuous to the upper end portions of the groove bottoms 51doab and 51dobb forming the groove curves at the angle of 110 ° and the upper end portions of the curved bottom faces 51doab and 51dobb, (51doau, 51dobu).

The single crystal diamond abrasive grain (B-4) having the crystal face do and the octahedral crystal face oc of the rhombohedral body is formed by the crystal faces oc1 and oc2 of the octahedron as two base end side crystal faces and the bottom faces 51doab and 51dobb of the mounting groove 5do, . On the upper slopes 51doau and 51dobu, the sides Si1 and Si2 formed by the crystal faces do of two adjacent gaps are aligned with each other. The two tops AP1 and AP2 (see FIG. 23) formed by the crystal planes of the four dodecahedrons are located closer to the rotation axis CL than the outer circumferential surface 22. The single crystal diamond abrasive grain (B-4) having the crystal face do and the octahedral crystal face oc of the optically active dodecahedron are held so as to be inclined with respect to the outer peripheral face 22 of the wheel 2,

Further, the mounting of the single crystal diamond abrasive (C-1) having the crystal face do and the hexagonal crystal face he of the rhombohedral single crystal diamond abrasive (C) is the same as that of the rhombohedral single crystal abrasive abrasive (C).

The particle size of the octahedral single crystal diamond abrasive grains 4 is # 16/18, but the present invention is not limited thereto. For example, a grain size in the range of # 12/14 to # 60/80 may be used, and preferably, when the grain size of the diamond abrasive grains is large # 20/30, an octahedral single crystal diamond abrasive grain # 12/14 is used .

In addition, 80 octahedral single crystal diamond abrasives 4 are arranged on the outer peripheral surface 22 of the wheel 2, but the present invention is not limited thereto. It is possible to arrange any number of 70 or 100 pieces depending on the size (grain size) of diamond abrasive grains of the diamond abrasive grain layer or the length of the outer peripheral surface of the wheel.

In addition, although the electroplating is performed by plating the small diameter diamond abrasive grains and the polyhedral single crystal diamond abrasive grains, the present invention is not limited thereto. For example, electroless plating may be used, or a plating layer may be formed by electroplating and electroless plating to plated and adhere small-diameter diamond abrasive grains and polyhedral single crystal diamond abrasive grains.

Further, although the adhesive 6 is a non-conductive adhesive agent, the present invention is not limited thereto. For example, a conductive adhesive agent may be used. As the conductive adhesive, for example, an epoxy resin-based 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 metal-based fillers such as Ni and Cu powder. When the octahedral monocrystalline diamond abrasive grains are adhered with a conductive adhesive, the electroplating layer starts to grow from the electroconductive adhesive agent which adheres the octahedral single crystal diamond abrasive grains and does not generate a gap between the octahedral monocrystalline diamond abrasive grains and the electroplating layer. As a result, the fixing by the electroplating layer can be made stronger.

As described above, the concrete configuration described in the above embodiment is merely an example of the present invention, and the present invention is not limited to such a specific configuration, but may be embodied in various forms without departing from the spirit of the present invention It is possible to adopt the state.

(Industrial applicability)

And is used in electrodeposited diamond dressers for forming threaded grinding wheels for gear grinding which require high precision and long life.

1: Electrodeposited diamond dresser for molding
2: Wheel
21: Taper face
21f: Outer taper surface
21r: Inner taper face
22:
25f: Outer band-shaped portion (band-shaped range)
25b: Inner band-shaped portion (band-shaped range)
26: Outer edge portion
3: diamond abrasive layer
31: Small diameter diamond abrasive grain
32: Electroplating layer (plating layer)
4: octahedral single crystal diamond abrasive (polyhedral single crystal diamond abrasive)
41: ridge
42: Top
43:
5: Mounting groove
51a: Both walls in the home
51b: Both walls in the home
52: Home line
6: Adhesive
CL: rotation axis
do1, do2: crystal plane of the dodecahedron (mounting crystal plane)
oc1, oc2: crystal plane of the octahedron (mounting crystal plane)
H1, H2: Head side Miller index {1, 1, 1} plane
M1, M2: Miller index at the base end {1, 1, 1} plane (mounting crystal plane)

Claims (6)

A wheel made of crude steel which is formed in a disc shape having tapered surfaces on both sides of the outer peripheral portion so as to be thinned toward the outer peripheral surface and is rotationally driven around the rotation axis;
A diamond abrasive grain layer extending in a strip shape at a predetermined width on an outer circumferential edge portion of the tapered surface and plated with a plurality of small diameter diamond abrasive grains by a plating layer;
A plurality of mounting grooves formed on the outer circumferential surface of the wheel so as to be parallel to the rotation axis and having both wall surfaces in a groove forming a predetermined angle; And
Wherein a surface of the ring-shaped diamond abrasive grains is formed with a grain size larger than that of the small-diameter diamond abrasive grains and has a mounting crystal plane (crystal plane) equal to the predetermined angle, A crystal that does not become a cleavage plane;
/ RTI >
Wherein each of the polyhedral single crystal diamond abrasive grains is formed such that the mounting crystal face is plated by the plating layer on both wall surfaces in the groove of the mounting groove of the wheel,
Electro-deposited diamond dresser for forming threaded grinding wheels for gear grinding. The method according to claim 1,
Wherein the plurality of polyhedral single crystal diamond abrasives are a plurality of octahedral single crystal diamond abrasives,
The mounting crystal plane has two miller indexes {1, 1, 1} adjacent to the ridgeline at an angle of 110 DEG in the octahedral single crystal diamond abrasive,
Wherein the wheel is provided with a plurality of mounting grooves extending in the direction of the rotation axis in the direction of the rotation axis,
The two in-groove inner wall surfaces of the respective mounting grooves and the two base end side Miller indexes {1, 1, 1} faces of the respective octahedral monocrystalline diamond abrasive grains are bonded with an adhesive,
Wherein the plating layer includes two base end miller indexes {1, 1, 1} and two base end miller indexes {1, 1, 1} Wherein said octahedral diamond abrasive grains are plated on said outer circumferential surface while covering a top portion where {1, 1, 1} faces cross each other. 3. The method of claim 2,
Wherein diamond abrasive grains of small diameters are plated by the plating layer between the plurality of octahedral monocrystalline diamond abrasive grains on the outer peripheral surface of the wheel. The method according to claim 2 or 3,
Wherein the two base side Miller indexes {1, 1, 1} faces and the two base side Miller indexes {1, 1, 1} Wherein the top portion at which the surface crosses is disposed closer to the rotation axis side than the outer circumferential surface in the radial direction of the wheel. 5. The method according to any one of claims 1 to 4,
Wherein the particle diameters of the small-diameter diamond abrasive grains are # 20/30 to # 100/120 and the particle sizes of the polyhedral single crystal diamond abrasive grains are # 12/14 to # 60 / . A wheel-forming step of forming a steel-reinforced wheel having a tapered surface on both sides of the outer peripheral portion so as to be thinner toward the outer periphery;
A mounting groove forming step of forming a plurality of mounting grooves extending at a predetermined interval on the outer circumferential surface of the wheel, the groove grooves extending in the direction of the axis of rotation of the wheel and the opposite wall surfaces of the grooves forming an angle of 110 degrees;
The two octahedral single crystal diamond grains having, at two base-end-side Miller indexes {1, 1, 1} adjacent to each other on the ridgeline at an angle of 110 DEG in the octahedral single crystal diamond abrasive grains, An octahedral monocrystalline diamond abrasive gluing process for adhering abrasive grains by an adhesive;
A diamond abrasive-contacting step of making a plurality of small-diameter diamond abrasive grains contact with the outer peripheral surface in a range extending in a band-like shape at a predetermined width on an outer peripheral edge portion of the tapered surface of the wheel; And
Forming a plating layer formed by plating in a range in which the octahedral single crystal diamond abrasive grains are adhered and the outer circumferential surface to which the small diameter diamond abrasive grains are in contact and the tapered surface to which the small diameter diamond abrasive grains are in contact in a strip- Wherein the diamond abrasive grains are plated in the range of the outer peripheral surface and the band-like shape, and the octahedral single crystal diamond abrasive grains are bonded to the two base end side Miller indexes {1, 1, 1} A plating step of covering a top portion where two Miller indexes {1, 1, 1} faces intersecting with Miller index {1, 1, 1} faces intersect and plating the outer periphery;
Wherein the step of grinding the gear comprises grinding the grinding wheel and grinding the grinding wheel.

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