A kind of diamond grinding wheel and preparation method thereof

Abstract

The invention relates to a diamond grinding wheel and a preparation method thereof and belongs to the field of superhard abrasives. The diamond grinding wheel comprises a steel core and an abrasive ring which are bonded through a resin binder and a resin adhesive binder. The abrasive ring is prepared from a diamond abrasive, a metal binder and an auxiliary binder. The metal binder contains Cu powder and Ti powder. The abrasive ring is constituted by the diamond abrasive, the metal binder and pores. The preparation method comprises the steps that (1) the diamond abrasive, the Cu powder and theTi powder are evenly mixed, and a mixture A is prepared; (2) the auxiliary binder and the mixture A are evenly mixed, and a mixture B is prepared; (3) the mixture B is dried; (4) the dried mixture B is screened; (5) the screened mixture B is subjected to cold press molding; (6) a green blank of the abrasive ring is sintered under an inert gas atmosphere, and then a blank of the abrasive ring is prepared; and (7) the blank of the abrasive ring and the steel core are bonded through the resin binder, and the diamond grinding wheel is prepared.

Description

technical field [0001] The invention relates to the field of superhard abrasives, in particular to a 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-precision grindi...

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