CBN (Cubic Boron Nitride) grinding wheel

Abstract

The invention relates to the field of superhard materials, and concretely relates to a CBN (Cubic Boron Nitride) grinding wheel. The invention provides the CBN grinding wheel, which has favorable shock resistance and shape retention, and can bear a larger load during a high-speed grinding process. The CBN grinding wheel comprises a steel core and an abrasive ring. The steel core and the abrasive ring are combined through a binding agent. The CBN grinding wheel is characterized in that the abrasive ring is prepared from the following raw materials in percentage by mass: 30 to 70 percent of CBN abrasive, 20 to 60 percent of metal binding agent, and 2 to 10 percent of auxiliary adhesion agent. The CBN grinding wheel provided by the invention has favorable heat conductivity and is beneficial for reducing the grinding temperature, so that the power loss is reduced, and the grinding speed is improved; the auxiliary adhesion agent in a formula is beneficial for forming pores, and the characteristic of high holding force of the metal binding agent is combined, so that a chip space can be effectively enlarged, and abrasives are more sufficiently utilized; and the grinding wheel has the characteristics of high grinding efficiency, low grinding temperature, low power loss, good processing accuracy, long service life and the like.

Description

technical field [0001] The invention relates to the field of superhard materials, in particular to a CBN grinding wheel. Background technique [0002] Modern machining is developing in the direction of high precision, high speed, hard machining, dry machining (no coolant) and cost reduction, which puts forward quite high requirements for the performance of superhard abrasive tools. Currently commonly used superhard grinding materials include cubic boron nitride (CBN) and diamond abrasives. Although the hardness of CBN abrasive is inferior to that of diamond, its thermal stability and chemical stability are strong, especially it will not react with iron and iron alloys, so it can be used in iron-based alloy materials such as hardened steel, high-speed tool steel, bearing steel, stainless steel, It has been widely used in the grinding of many high-strength toughness difficult-to-machine materials such as die steel, heat-resistant steel, advanced high-strength steel and high-c...

AI Technical Summary

Problems solved by technology

Resin bond is easy to process and repair, but its use temperature is low, its bonding strength and holding force to abrasives are low, abrasives are easy to fall off, and grinding accuracy is poor; ceramic bond has better bonding strength, high holding force, and high use temperature , but its high brittleness, poor thermal conductivity, poor impact resistance and fatigue performance, it is difficult to apply to high-speed processing

Although the existing metal bond has good strength, toughness and heat resistance, there is usually a problem that chemical metallurgical bonding cannot occur between the bond and the abrasive grains, so the abrasive grains are only mechanically embedded in the bond , the holding force is limited; it is easy to cause the failure of the grinding wheel due to the shedding of abrasive particles, especially in the high-efficiency grinding of difficult-to-machine materials; in addition, the exposed height of the abrasive is low, and the chip space is small, and it is easy to be damaged by the chip during grinding. failure due to clogging