Metal-based diamond grinding wheel and manufacturing method thereof

Abstract

The invention relates to a metal-based diamond grinding wheel and a manufacturing method thereof. The grinding wheel comprises a steel core and an abrasive ring, wherein the abrasive ring is preparedfrom, by mass, 35-55 percent of diamond abrasive, 40-55 percent of metal binder and 5-15 percent of auxiliary binder. The metal binder contains, by mass, 50 to 60 percent of Cu powder, 30 to 45 percent of Sn powder and 5 to 10 percent of Ti powder. A method for manufacturing the metal-based diamond grinding wheel comprises the following steps: according to the proportion of the abrasive ring, uniformly mixing the components, uniformly mixing with the auxiliary binder, drying, sieving and molding, sintering in an inert gas atmosphere, raising the temperature to the sintering temperature at a heating rate of 5-15 DEG C / min, sintering for 20-60 min, cooling to obtain an abrasive ring blank, and bonding with a steel core to obtain the metal-based diamond grinding wheel. The method is short insintering time, the prepared abrasive wheel has good thermal conductivity and large space for accommodating metal chips and abrasives in the working process, is not easy to block in the high-speed grinding process, is sharp in grinding, has high grinding accuracy, and has self-sharpness.

Description

technical field [0001] The invention relates to the field of superhard abrasives, in particular to a metal-based diamond grinding wheel and a manufacturing method thereof. Background technique [0002] With the development of modern machining in the direction of high precision, high speed, hard machining, dry machining (no coolant) and cost reduction, quite high requirements are put forward for the performance of abrasive tools. Traditional silicon carbide and corundum ordinary abrasive molds can no longer fully meet the current high-speed, high-efficiency, and high-precision grinding requirements. Therefore, it is an inevitable development to develop various superhard grinding materials with excellent wear resistance and stable processing for a long time trend. Currently commonly used superhard grinding materials include diamond and cubic boron nitride abrasives. Diamond is the hardest material and is extremely wear-resistant, suitable for high-speed grinding and ultra-pr...

AI Technical Summary

Problems solved by technology

Traditional superhard abrasives (grinding wheels) are mostly manufactured by resin, ceramics, metal bond sintering and electroplating. The problem is that single crystal particles are only mechanically embedded in the bond and electroplating layer, and bond and Weak force between plating layers

Specifically, although the resin bond is relatively easy to process and repair, it has poor heat resistance, low bonding strength, serious abrasive shedding, and seriously affects efficiency; the vitrified bond is relatively easy to repair and has a high service temperature, but it is brittle and impact toughness. Poor fatigue, prone to brittle cracking, difficult to use in high-speed machining

Although metal bond sintering has strong heat resistance, chemical metallurgical bonding cannot occur between the bond and the abrasive grains, so the abrasive grains are only mechanically embedded in the bond with limited holding power; abrasive grains in metal electroplating are only mechanically embedded

Therefore, it is easy to cause the overall failure of the grinding wheel due to the particle shedding of the abrasive and the peeling off of the coating in flakes. This situation is especially obvious when the more difficult-to-process materials are efficiently ground; in addition, the coating is thick, the exposure height of the abrasive is low, and the chip space is small. , it is easy to fail due to the adhesion and clogging of chips during grinding