JP2000218520A - Work carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a long term use under a high working accuracy by constructing at least a part where a carrier pocket for holding a work is formed, of wear resistant member containing super abrasive grains. SOLUTION: A work carrier 11 is constructed of a base 13 and a pocket member 27 forming a carrier pocket 25. The base 13 is formed of a metal disc and has a plurality of recesses of same shape along it outer circumference at eqaual intervals with a short boundary 21 held therebetween. The pocket member 27 is mounted to the recess 15 on the base 13 so as to directly construct the carrier pocket 25. The pocket member 27 is made of a member which is formed by binding super abrasive grains with metallic bonding material (metal bond) such as bronze powder, and is formed by hot press or the like. With the constitution, the member constituting the carrier pocket 25 in which the work is stored is formed by the metal bond, the carrier pocket 25, and accordingly the carrier pocket 25 with an extremely good wear resistant characteristic is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work carrier for holding a work, which is used in a method for simultaneously processing two parallel surfaces of a work, that is, a work, such as double-head grinding.

[0002]

2. Description of the Related Art For example, in a double-head grinding process, there is a method called a rotary carrier method as a method for continuously processing a large number of works. In this method, as shown in FIG. 6, a large number of carrier pockets 2 for holding a work are formed near the outer periphery of a disk-shaped work carrier 1 and grinding is performed in a state where the work 3 is held in the carrier pocket 2. Pass between the upper and lower heads 4, 5 which are wheels,
The upper and lower surfaces of the work projecting from the upper and lower surfaces of the work carrier are ground. Conventionally used work carriers include iron-based materials such as SK materials and resin-based materials such as epoxy containing glass fiber and bakelite.

[0003]

By the way, the holding portion for holding the work of the work carrier, that is, the carrier pocket, is required to stably hold the work during the machining and to allow the work to be easily taken in and out. is there. Therefore, for example, in the case of a cylindrical work, the inner diameter of the carrier pocket is about 10 times the outer diameter of the work.
Set the diameter larger by%. And since the conventional work carrier is made of the above-mentioned material, the work pocket is abraded or deformed due to the contact with the work being processed, and the work is stably held. You will not be able to do it. As a result, the work comes to play in the carrier pocket during the processing, and the processing accuracy of the work is reduced, resulting in defective products. Especially recently, such tasks are often automated,
In this case, there is a risk of occurrence of a large number of defective products, and frequent replacement of the work carrier is required.

The present invention has been made in view of the above-mentioned problems of the work carrier according to the prior art, and has a high abrasion resistance, can be used for a long period of time, and can maintain good machining accuracy of the work. The purpose is to provide a carrier. It is also an object of the present invention to provide a work carrier which is tough and does not crack or chip even when the work hits the work carrier during attachment or detachment of the work from the work carrier or during processing.

[0005]

In order to solve the above-mentioned problems, in a work carrier according to the present invention, at least a portion for forming a carrier pocket for holding the work is made of an anti-abrasive material containing super-abrasive grains. It was composed of a wearable member.

In one embodiment, the wear-resistant member is a member in which superabrasive grains are fixed by metal bonds.

[0007] In one embodiment, the superabrasive is diamond.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited to the embodiments described below.

FIG. 1 is a plan view conceptually showing a state in which double-head grinding is performed using a work carrier 11 according to a first embodiment of the present invention. A large number of substantially semicircular carrier pockets 25 are formed at regular intervals along the outer periphery of the work carrier 11. The works 101 are received in the carrier pockets 25, respectively. Reference numeral 103 denotes a semi-circular guide concentrically arranged with the work carrier 11, the inner peripheral surface 105 of which is in contact with the outer periphery of the work 101, and holds and guides the work 101 in the carrier pocket 25. ing. 107 is a grinding wheel,
Two work carriers 11 are arranged vertically above and below the work carrier 11.
Then, as the work carrier 11 rotates, the work 101 held in the carrier pocket 25 is sequentially fed between the upper and lower grinding wheels, and the upper and lower surfaces thereof are ground.

FIG. 2 shows the work carrier 11 shown in FIG.
FIG. 3 is a partially enlarged plan view of the guide 103 and FIG.
FIG. 3 is a sectional view taken along line AA in FIG. The work carrier 11 includes a base 13 and a pocket member 27 forming a carrier pocket 25.

The base metal 13 is a disk made of an appropriate metal material such as carbon steel, and has a plurality of recesses 17 of the same shape along the outer periphery thereof with a short boundary portion 21 interposed therebetween. Are formed at equal intervals. The concave portion 15 has a semicircular portion 17
And short straight portions 19 extending in parallel from both ends of the semicircular portion 17.

Reference numeral 27 denotes a pocket member which is attached to the concave portion 15 of the base metal 13 and directly constitutes the carrier pocket 25. The pocket member 27 is made thinner by about 0.1 mm than the thickness of the base metal 13, and includes a semicircular portion 29 and straight portions 31 extending parallel to each other from both ends of the semicircular portion 29. The outer shape corresponds to the shape of the concave portion of the base metal 13, and the inner shape corresponds to the outer shape of the work received in the carrier pocket 25. That is, in the present embodiment, the outer shape of the work 101 is circular, and
The inside radius of the semicircular portion 29 is slightly larger than the radius of the work, so that the work can easily enter and exit the carrier pocket 25, and the fixed guide 10 can be fixed.
By moving along 3, the stored work is stably held so as not to play in the carrier pocket. As shown in the figure, the tip of the straight portion 31 of the pocket member 27 is slightly retracted on the same circumference as the tip of the boundary 21 of the base 13 or inside.

The pocket member according to the present embodiment is made of a material containing superabrasive grains. More specifically, it is a member formed by solidifying superabrasive grains with a metallic binder such as bronze powder (metal bond), and is formed by hot pressing or the like. The superabrasives include CBN abrasives and the like, but the superabrasives used in the present embodiment are diamond. Diamond has higher abrasion resistance than CBN, and can be suitably used as a pocket member. The diamond used in the present invention has a diameter of 300 microns or less, a single diameter or a mixture of a plurality of diameters. The pocket member may be brazed or other means. In the present embodiment, the pocket member is adhered to the base 13 using an epoxy-based adhesive. The guide 103 in the present embodiment is not particularly limited in its material, and for example, a cemented carbide, hardened steel, or the like can be used.

As described above, in the present embodiment, since the members constituting the carrier pocket for accommodating the work are formed by metal bonds, the carrier pocket has extremely excellent abrasion resistance, and is compared with the conventional work carrier. Thus, a work carrier having extremely excellent wear resistance is provided, and high machining accuracy can be maintained for a long time without replacing the work carrier.

In place of the metal bond, as a wear-resistant member containing superabrasive grains, a member obtained by electrodepositing superabrasive grains, for example, diamond on a base metal, or a member formed of diamond compact can be used. With these, it is possible to secure extremely excellent wear resistance as compared with a conventional work carrier. However, the electrodeposited diamond has only one diamond layer, and it is necessary to reduce the amount of protrusion of the diamond abrasive grains in order not to damage the work. The diamond compact is more expensive than a metal bond and is inferior to a metal bond in toughness. Therefore, it turned out that the use of a metal bond is optimal.

[0016]

Here, one concrete example and one of the conventional examples will be described in detail as comparative examples as follows. Table 1 shows the results. Example A work carrier shown in FIG. 2 was manufactured. Base 13 is SK
The material is 2.3 mm thick. Subsequently, particle size 100 /
120 diamonds were sintered by metal bond to produce a pocket member having a thickness of 2.2 mm. Specifications are SD10
0N125M. This pocket member was arranged so as not to protrude from both side surfaces of the base metal, and was fixed with an epoxy-based adhesive. Using this work carrier, hardened steel S
The width of the UJ2 cylindrical member was determined. Even after machining 1 million pieces, the wear of the carrier pocket is 0.1 m in radius
m or less, and the processing accuracy of the work was good. Comparative Example Similar width determination processing was performed using a conventional SK material work carrier. The machining was stopped and the work carrier was replaced because the carrier pocket was worn by about 1 mm in radius after machining of 300,000 pieces, resulting in poor machining accuracy of the work.

[0017]

[Table 1]

FIG. 4 is a partially enlarged plan view of a work carrier 41 according to a second embodiment of the present invention. The present embodiment is characterized in that a pocket member 47 constituting the carrier pocket 45 is formed integrally. That is, unlike the first embodiment, the base metal 43 does not have a recess at its outer peripheral portion and is a member having a circular outer periphery. On the other hand, the pocket member 47 is formed in an annular shape, and a plurality of recesses 48 forming the carrier pocket 45 are formed at equal intervals on the outer peripheral side.

The pocket member 45 is also formed by solidifying super-abrasive grains, more specifically, diamond abrasive grains with a metal bond. The molding of the pocket member 45 and the attachment to the base metal 43 are performed as follows. That is, the base metal 43 is first sintered integrally,
An annular diamond metal bond compact having a predetermined width is formed on the outside of the outer periphery of the metal alloy. That is, the pocket member 45
Of the base material and mounting on the base 43 are performed at the same time. Next, carrier pockets 45 are sequentially formed by electric discharge machining. When using the work carrier according to the embodiment in this embodiment, the same type of guide as the guide 103 used in connection with the work carrier according to the first embodiment is used.

FIG. 5 is a partially enlarged plan view of a work carrier 61 according to a third embodiment of the present invention. This embodiment differs from the first and second embodiments in that the formed carrier pocket 65 is a closed circle. That is, the base metal 63 is provided with a number of holes 64 having the same diameter at equal intervals along the circumferential direction in the vicinity of the outer periphery thereof, and a ring-shaped pocket member 67 is fixed in the holes 64 with an adhesive. , And a carrier pocket 65.

In the above embodiment, an example in which the work carrier is used mainly for double-head grinding has been described. However, the use of the work carrier of the present invention is not limited thereto.
For example, it can be used in lapping and the like.

[0022]

As described in detail above, in the work carrier according to the present invention, at least the member constituting the carrier pocket for receiving the work is formed of a wear-resistant member containing superabrasive grains. Carrier pockets are extremely abrasion resistant and can be used for a very long time while maintaining high machining accuracy compared to conventional work carriers, greatly reducing machining costs. be able to. In addition, when a member formed by consolidating superabrasive grains with a metal bond is used as the wear-resistant member containing the superabrasive grains, the toughness is excellent, and the carrier, which is a particularly important part of the work carrier, is used. Chipping and cracking in the pocket can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view conceptually showing a state in which double-head grinding is performed using a work carrier according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged plan view of a work carrier and a guide in FIG.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a partially enlarged plan view of a work carrier according to a second embodiment.

FIG. 5 is a partially enlarged plan view of a work carrier according to a third embodiment.

FIG. 6 is a perspective view of a main part showing a double-head grinding process by a rotary carrier method using a work carrier.

[Explanation of symbols]

 11, 41, 61 Work carrier 13, 43, 63 Metal base 15 Concavity 25, 45, 65 Carrier pocket 27, 47, 67 Pocket member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Abe 185 Kuji, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Diamond Industrial Co., Ltd. F-term in the Tamagawa Plant of Industrial Co., Ltd. (reference) 3C058 AA04 AA09 AA18 AB04 AB08 CA02 CB01 CB06 DA06

Claims (3)

[Claims] 1. A work carrier for use in a working method in which two heads as working tools are arranged to face each other, a work is sent between the two heads, and a work is simultaneously performed on two parallel surfaces of the work. In a work carrier in which a plurality of carrier pockets having a shape corresponding to the outer shape of a work are formed on an outer peripheral portion or in the vicinity of an outer peripheral portion of a disk-shaped substrate, at least a portion forming the carrier pocket is formed by using super-abrasive grains. A work carrier comprising a wear-resistant member. 2. The work carrier according to claim 1, wherein the wear-resistant member is a member formed by fixing superabrasive grains with a metal bond. 3. The work carrier according to claim 1, wherein the superabrasive grains are diamond.