Influence of Hollow Ceramic Ball on the Properties of Metal Bond Diamond Grinding Wheel

With the rapid development of high speed grinding and ultra-precision grinding technology, the industrial application puts forward higher requirements for diamond grinding wheel. In order to improve the performance of grinding wheel, many studies adopt isostatic pressing sintering technology, vacuum hot pressing sintering technology, prealloying of metal bond, surface plating of diamond, orderly arrangement of abrasives and other new technology, to make the cost performance of metal bond diamond grinding wheel get more optimization.

However, the traditional metal bond diamond grinding wheel is dense type, which has poor self-sharpening, and is easy to jam. Therefore, bringing pore structure into metal bond to improve the grinding wheel porosity, and thus improving the performance of grinding wheel and other abrasives products, has practical application significance. As early as in 1992, Japanese scholars put forward that applying the pore structure of porous ceramic bond grinding wheel in metal bond grinding wheel, which points out the direction for improving the performance of metal bond grinding wheel.

Zuo Hongsen studied NaCl, K3PO4 and other soluble salts’ influence on the mechanical behavior of metal bond diamond grinding wheel, and found that pore-forming agent material shape is closely related with the shape of the hole in the sample, and has little influence on the decline of strength and hardness of samples. Liao Cuijiao once tried to use ordinary hot pressing sintering method, adding low melting point material into bronze bond as pore-forming material, to research the corresponding relationship between porosity and pore-forming agent content, and porosity and flexural strength, and providing basic data and experimental experience for practical production formula of porous metal bond diamond grinding wheel.

Wang Shaowu used common hot pressing sintering process, to make different porosity of metal bond diamond grinding wheel by choosing suitable pore-forming agent and adjusting the content of pore-forming agent, and researched on its grinding temperature characteristic for two different workpiece materials. The experimental results show that different porosity and grain size of metal bond diamond grinding wheel’s grinding temperature is increased with the increase of rotational speed and cutting depth; With the increase of porosity, the grinding temperature of fine-grained grinding wheel decreases.

Based on previous studies, we can learn that the pore-forming agent can improve the performance of grinding wheel, but the soluble salts material as pore-forming agent absorbs water easily and affects grinding wheel quality. Therefore, how to choose more suitable pore-forming agent to make grinding wheel with good sharpness, in order to improve the working efficiency, is an important research direction.

Researchers use normal hot pressing sintering method to make metal bond matrix sample and diamond grinding wheel, form pores in the structure by means of adding hollow ceramic ball, and discuss the shape, grit size, additive amount of matrix sample and the influence of grinding wheel of hollow ceramic ball, , expecting to develop low cost, high quality, high efficiency metal bond diamond grinding wheel.