At present, the new development situation of domestic diamond grinding wheels


2022-06-01 15:53

Diamond grinding wheel is a tool for grinding hard alloys, glass, ceramics, gemstones and other hard and brittle materials. In recent years, with the rapid development of high-speed grinding technology, higher requirements have been placed on grinding wheels. Ceramic resin-bonded grinding wheels can no longer meet production needs. Metal-bonded grinding wheels have high bonding strength, good formability, and long service life. Significant characteristics and production have been widely used. Metal bond diamond grinding wheels mainly have two types of sintering and electroplating according to different manufacturing methods. In order to give full play to the role of super-hard abrasives, a new type of grinding wheel has been developed abroad using high-temperature brazing technology since the early 1990s, that is, single-layer high-temperature brazing super-hard abrasive grinding wheels. At present, this kind of sand-ceramic diamond grinding wheel in China (5 photos) The wheel is still in the research and development stage.
The vitrified bond diamond grinding wheel has the common characteristics of diamond and vitrified bond. Compared with ordinary corundum and silicon carbide grinding wheels, its grinding force is strong, the temperature is relatively low during grinding, and the grinding wheel wear is relatively small; it can adapt to various coolants The role of grinding wheel; the shape retention of the grinding wheel during grinding is good, and the precision of the workpiece is high; there are many pores in the grinding wheel, which is conducive to chip removal and heat dissipation during grinding, and is not easy to block and burn the workpiece; the self-sharpness of the grinding wheel Better, the longer the trimming interval is, the easier trimming is. Therefore, the use of vitrified bond diamond grinding wheels in some developed countries abroad is increasing.
The sintered metal bond grinding wheel mostly uses bronze and other metals as the bond, and is manufactured by the high temperature sintering method. It has high bonding strength, good formability, high temperature resistance, good thermal conductivity and wear resistance, long service life, and can withstand large loads. Due to the inevitable shrinkage and deformation during the sintering process of the grinding wheel, the grinding wheel should be reshaped before use, but it is difficult to dress the grinding wheel. At present, the grinding wheel-to-roll shaping method commonly used in production is not only time-consuming and laborious for dressing, but also a lot of diamond particles fall off during the dressing process, the dressing grinding wheel itself consumes a lot, and the shaping accuracy is low.
In recent years, scholars from all over the world have successively carried out research work on dressing metal bond diamond grinding wheels by applying special processing methods, mainly including electrolytic dressing method, EDM dressing method and compound dressing method. The electrolytic dressing method is fast, but the shaping accuracy is not high; the electric spark dressing method has high shaping precision, which can be shaped and sharpened, but the shaping speed is slow; the compound dressing method includes electrolytic spark compound dressing method, mechanochemical compound dressing method etc., the dressing effect is good, but the system is more complicated, so the dressing problem of sintered diamond grinding wheel has not been well solved.
In addition, because the grinding wheel manufacturing process determines that its surface morphology is random, and the geometric shape, distribution and height of each abrasive particle and the height of the cutting edge are inconsistent, so only a few high cutting edges are cut to the workpiece during grinding, which limits the grinding quality. Efficiency is further improved.