Method for producing metal and diamond composite body

Abstract

The invention discloses a method for manufacturing a composite body of metal and diamond, comprising the following steps: diamond grits and metal powder bonds are arranged between two metal plates which can be copper plates or low-carbon steel plates, the metal plates are rolled to be in a flat pipe shape, braze welding and sealing are carried out on the round seaming part to manufacture a prefabricated piece, and multi-time cold rolling is carried out so that the thickness of the metal plates in a flat pipe shape is a little bigger than that of a particle and the metal plates in a flat pipe shape are sintered at the temperature ranging from 700-900 DEG C. The invention abandons a traditional powder metallurgy like method, instead, the capability feature that great difference exists between the rigidity of the diamond and the rigidity of the copper plate or the low-carbon plate is utilized, thereby the diamond embedded into a copper block or a low-carbon block in the rolling process and the combination of a little amount of metal powder bonds and high-speed flow deformation and large deformation rate which are unique in the rolling process enable the metal plates to be mutually welded so that the problem in the traditional method that the metal powder is prone to be oxidized to cause the sintering quality to be reduced is avoided. The invention is favorable for the mechanized and automated manufacturing and lowers the manufacturing cost.

Description

technical field [0001] The invention relates to a method for manufacturing a metal and diamond composite body. The method used employs rolling techniques. Background technique [0002] The metal and diamond composite is the working part of the metal bond diamond tool. Synthetic diamond is an artificial crystal, the particle diameter of the general application is less than 0.5mm, and the diamond hardness is as high as HV9000~10000. Its crystal structure is stable below 770°C under normal pressure and atmospheric conditions, and it will be oxidized when it exceeds 770°C. The oxidation will intensify as the temperature rises. . Due to the small size of industrial diamond particles, it is generally necessary to use a binder to bond the particles into a block in the process of manufacturing abrasive tools, which is a composite body. Metal, resin, ceramics, rubber or electroplating can be used as abrasive bond materials, and the main function is to inlay and clamp fine diamond ...

AI Technical Summary

Problems solved by technology

Here are the following insurmountable problems: First, most metal powders are easier to oxidize (larger specific surface area) than the same kind of metal blocks. The reduction treatment and hot pressing of metal powders before use are all to solve this problem. But it turns out that the problem of oxidation of the surface layer of the particles, which affects the quality of the complex, often occurs

Second, the price of almost all metal powders is higher than that of metal plates, pipes, etc., and the performance of the powder after sintering is much lower than that of similar metal blocks (the density is lower than that of the block), and the density is relatively low. Difficult to meet the body weight requirements

Third, due to the consideration of the ability of diamond to withstand temperature, during the metal powder sintering process and the metal powder composition ratio, it is often limited by the temperature to add low melting point substances, such as Sn, Zn, etc., thus sacrificing the sintered block. body performance

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