Ultra-hard diamond grinding wheel and preparation method thereof

Abstract

The invention relates to an ultra-hard diamond grinding wheel and a preparation method thereof and relates to the field of super-hard abrasives. The grinding wheel comprises a steel core and an abrasive ring, and the steel core and the abrasive ring are combined through a resin bonding agent and a resin adhesive binding agent; the abrasive ring is prepared from diamond abrasives, a metal bonding agent and an auxiliary binding agent; the metal bonding agent contains Cu60Sn40 powder and Ti powder; and the abrasive ring is composed of diamond abrasives, a metal bonding agent and a pore. The preparation method includes the steps that firstly, the diamond abrasives, the Cu60Sn40 powder and the Ti powder are mixed uniformly, and a mixed material A is obtained; secondly, the auxiliary binding agent and the mixed material A are mixed, and a mixed material B is obtained; thirdly, the mixed material B is dried; fourthly, the mixed material B after being dried is subjected to sieving; fifthly, the mixed material B after being subjected to sieving is subjected to cold pressing and forming, and an abrasive ring green is obtained; sixthly, after the abrasive ring green is sintered in an inert gas atmosphere, an abrasive ring green body is obtained; and seventhly, the abrasive ring green body and the steel core are glued through the resin adhesive binding agent, and the ultra-hard diamond grinding wheel is obtained.

Description

technical field [0001] The invention relates to the field of superhard abrasives, in particular to a superhard diamond grinding wheel and a preparation 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-precis...

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