Preparation method of low melting point aluminum-boron-silicon glass ceramic bond for CBN (Cubic Boron Nitride) grinding tool

Abstract

The invention provides a preparation method of a low melting point aluminum-boron-silicon glass ceramic bond for a CBN (Cubic Boron Nitride) grinding tool. The glass ceramic bond with uniform components can be obtained by taking oxides such as 55-70% of SiO2, 5-20% of Al2O3, 5-15% of B2O3, 3-7.5% of Na2O, 0.1-2% of K2O, 1-6% of Li2O, 1-3% of ZnO, 0.5-2% of CaO, 0.5-2% of MgO and the like as raw materials for melting the glass ceramic bond and using a high temperature melting and water quenching method. Boron oxide and sodium oxide are added into the raw materials to reduce the softening temperature of the bond, and meanwhile, a proper amount of lithium oxide is added to ensure that low-expansion spodumene crystals are separated out in the bond sintering process, so that the thermal expansion coefficient of the glass ceramic bond is reduced, and the mechanical strength and chemical stability of the glass ceramic bond are improved. Compared with the traditional glass ceramic bond for the grinding tool, the bond provided by the invention has the advantages of low melting and softening temperatures and convenience in crystallization control; and the prepared glass ceramic bond has a lower thermal expansion coefficient and higher chemical stability and mechanical strength.

Description

technical field [0001] The manufacturing technology of the abrasive bonding agent of the present invention particularly relates to a preparation method of the bonding agent for CBN abrasive grains (preparing CBN abrasive tools). Background technique [0002] The remarkable feature of CBN (cubic boron nitride) abrasive grains is high hardness, which is second only to diamond. It has excellent processing performance of iron group materials and is widely used in the field of grinding. All kinds of CBN grinding tools are widely used in machining, metal material forming grinding and precision machining and other fields. Abrasive tools prepared with CBN abrasive grains have the following advantages: high metal grinding efficiency, large grinding ratio, good wear resistance, good self-sharpening, high machining accuracy of the workpiece surface during fine grinding, and relatively high performance during profile grinding. High grinding efficiency, good surface processing quality. ...

AI Technical Summary

Problems solved by technology

This makes the CBN abrasive tool produce thermal stress between the abrasive and the bond during the preparation and use of the CBN abrasive tool, resulting in cracks and the appearance of large cracks, which reduces the bonding strength of the bond to the CBN abrasive grains, and the abrasive grains are easy to grind at high speeds. Falling off during the process increases costs and reduces the service life of the grinding wheel

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