JPS603954B2 - Forming method for metal bonded diamond or cubic boron nitride grindstone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a metal-bonded diamond or cubic chamber-side grindstone in which a desired shape such as a highly accurate screw thread shape is formed on the outer peripheral surface.

According to the metal bonded diamond grindstone made by the forming method of the present invention, for example, ferrite, ceramics,
It is possible to grind screws etc. on the outer peripheral surface of non-metallic hard-arm materials such as glass, and similarly, according to the metal bond cubic nitride terrace grindstone, it is possible to grind screws etc. on the outer peripheral surface of metal materials such as hardened steel and stainless steel. Can grind screws, etc.

It is very difficult to form a highly accurate thread shape on the outer peripheral surface of such a metal-bonded diamond or cubic nitride shelving stone because diamond or cubic nitride shelving is a very hard substance. Ta.

Recently, a method of forming by electrical machining, ie, electrical discharge machining or electrolytic machining, has been developed, but the entire device is very complicated and expensive, and the hard carbon that serves as the electrode is also expensive, and this hard carbon is a consumable material. It is uneconomical because a textbook is required to form one whetstone, it requires a large amount of power and time to form one whetstone, it is difficult to conduct electrical conduction and insulation during forming, and there is a risk of sparks. There are problems such as damage to expensive diamonds due to the generation of diamonds.

The present invention has been made in order to solve the problems of such conventional forming methods. Then, by rotating a rotating top formed of a hard substance while pressing it, the outer circumferential surface of the above-mentioned dawn feeder is plastically deformed, thereby forming a desired shape such as a threaded shape on the outer circumferential surface of the pseudo-consolidation. Another invention is a method for forming a metal bonded diamond or cubic nitride shelmetal abrasive stone, which is characterized by the following: , plastically deforming the outer peripheral surface of the sintered body by rotating it while pressing a rotating piece formed of a hard substance, thereby forming a desired shape such as a screw thread shape on the outer peripheral surface of the sintered body; After that, the sintered body has a fine grain size and a soft bond, and the formed outer circumferential surface of the sintered body is sharpened by grinding a grindstone rod. Alternatively, the present invention is an invention of a method for forming a metal bond diamond or a cubic nitride shelved stone, which is characterized by exposing abrasive grains of cubic nitride shelbals.
In the above configuration, the rotating top is made of hard materials such as hardened steel, cemented carbide, alumina porcelain, and hard carbon.The outer periphery of the rotating top is thread-shaped, and the inner diameter is made as large as possible to withstand strong pressure. I have to try to endure it.

The rotating top may be simply arranged rotatably or may be rotated as a driving body.

Correspondingly, the sintered body may be simply arranged rotatably or may be rotated as a driving body,
When one of the rotating top and the composite body rotates as a driving body, the other may rotate as a driven body, such as a set of rollers. Furthermore, the rotating top may have one thread shape on its outer periphery as shown in FIG. 1, or may have two or more thread shapes connected together as shown in FIG. 6.

To explain the embodiment of the grindstone forming method of the present invention shown in the drawings, as shown in FIGS. 1 and 3, a metal powder powder body 2 containing abrasive grains 1 of diamond or cubic crystal nitride is made of: It is attached to the outer periphery of a metal grindstone body 4 which is iron-coupled to the rotating shaft 3.

On the other hand, the rotating top 5 made of a hard material has one screw thread on its outer periphery as shown in FIG. The shaft 7 is fixed to a support 8. Therefore, the metal powder compact 2 is rotated by rotationally driving the rotating shaft 3.
When the rotating top 5 is pressed against the outer circumferential surface of the sintered body 2 as shown in FIG. Since it is softer than the piece 5, its outer circumferential surface is plastically deformed, and eventually an annular thread shape 9 as shown in FIG.

This annular thread shape 9 is formed by pressing the outer circumferential surface 10 of the sintered twill body 2 shown in FIG. The diamond or cubic nitride abrasive grains 1 contained inside the metal powder sintered body 2 between the It is concentrated on the outer edge of the annular thread shape 9.

Next, the abrasive grains 1 of diamond or cubic nitride fiber are formed on the outer peripheral surface of the sintered body 2, that is, on the outer edge of the annular thread shape 9, as shown in FIG. It is better to sharpen this outer circumferential surface since it is buried in the area.

Therefore, when the grinding wheel shown in Fig. 4 is used to reduce the grain size and soften the bond and grind the grinding wheel rod, the grinding wheel rod simultaneously separates the low grain 1 and the abrasive grain 1 of the grinding wheel. The metal powder sintered body 2 between the two is ground, and the abrasive grains 1 of diamond or cubic shelmetide nitride are exposed from the outer peripheral surface to obtain a finished product as shown in FIG. As explained above, according to the molding method of the present invention, the above-mentioned sintering is performed by rotating a rotating piece formed of a hard material while pressing it against the outer peripheral surface of a metal powder sintered body containing abrasive grains such as diamond. Since a desired shape such as a threaded shape is formed on the outer peripheral surface of the body, the metal bond grindstone can be easily formed using a simple device.

A comparison of the forming method of the present invention with a recently developed method for forming metal bonded diamond grindstones by electrical discharge machining is as follows. As described above, the molding method of the present invention allows a grindstone to be molded much more easily and at a lower cost than the molding method using electrical discharge machining.

Next, compared to the forming method using electric discharge machining, the forming method of the present invention does not lose the shape of the threads formed on the outer peripheral surface and is more durable, and the total amount of diamond etc. used is the same. However, the distribution amount on the outer circumferential surface of the grindstone is large, and as a result, a metal bond diamond or cubic nitrided side grindstone with good sharpness and high processing accuracy can be economically formed.

To explain this with reference to the drawings, in the case of a forming method using electric discharge machining, the removed portion 11 located between the two-dot chain line of the metal powder stripe shown in FIG. 2 and the thread-shaped outer peripheral surface shown by the solid line
is removed, so the feeder body, diamond, etc. of the removed portion 11 are wasted, which is uneconomical, and the outer circumferential surface of the formed thread shape is not formed by plastic deformation. The distribution of diamonds and the like is small, and the sharpness is therefore poor.

On the other hand, in the case of the forming method of the present invention, as shown in FIG. , which exhibits the excellent effects described above.

Next, according to the forming method of the present invention, after forming a desired shape such as a thread shape on the outer circumferential surface of the sintered body as described above, the sintered body is used to form a grinding stone with fine grain size and a soft bonding degree. Since the formed outer circumferential surface of the rod is sharpened by grinding, diamond or cubic nitride columnar grains are applied from the outer circumferential surface of the metal powder sintered body that has been formed into a desired shape such as a screw thread shape. A metal bonded grindstone with exposed abrasive grains can be easily produced.

[Brief Description of the Drawings] Fig. 1 is a longitudinal sectional front view of the main part showing an example of the method for forming a metal bonded grindstone of the present invention, and Fig. 2 is a front view of a main part showing an example of the method for forming a metal bonded diamond grindstone according to the present invention. FIG. 3 is an enlarged cross-sectional view of a sintered body shown in a state formed by the forming method of the present invention, and FIG. FIG. 5 is an enlarged sectional view of the main part showing the whetstone shown in FIG. 4 in a sharpened state, and FIG. be. In the drawings, 1 is a diamond or cubic nitride shelmetite abrasive grain, 2 is a metal powder crystal, 3 is a rotating shaft, 4 is a metal grinding wheel body, 5 is a rotating piece, 6 is a bearing, 7 is a shaft, 8 9 is a support body, 9 is an annular screw thread shape, 10' is an outer peripheral surface of a sintered body, 11 is
is the removal part. O diagram O 2 diagram O 3 diagram Z 4 diagram 3 diagram Fang 6 diagram

Claims (1)

[Scope of Claims] 1. The outer peripheral surface of a metal powder sintered body containing abrasive grains of diamond or cubic boron nitride is rotated while pressing a rotary piece formed of a hard substance onto the outer peripheral surface of the sintered body. A method for forming a metal-bonded diamond or cubic boron nitride grindstone, which comprises plastically deforming the sintered body to form a desired shape such as a thread shape on the outer peripheral surface of the sintered body. 2. Plastically deforming the outer circumferential surface of the sintered body by pressing and rotating a rotating piece formed of a hard substance onto the outer circumferential surface of the metal powder sintered body containing abrasive grains of diamond or cubic boron nitride; A desired shape, such as a threaded shape, is formed on the outer circumferential surface of the sintered body, and then the sintered body is shaped by grinding a grindstone rod with fine grain size and a soft bonding degree using the sintered body. A method for forming a metal bond diamond or cubic boron nitride grindstone, which comprises sharpening the outer circumferential surface of the sintered body, thereby exposing diamond or cubic boron nitride abrasive grains from the formed outer circumferential surface of the sintered body.