CBN grinding wheel of low temperature vitrified bond and preparation technique thereof

Abstract

A CBN grinding wheel of a low-temperature ceramic bond consists of a bond, auxiliary materials, an abrasive layer and a transition layer. The components and the proportion of the bond are 48-60% of SiO2, 25-37% of Al2O3, 5-10% of Na2O and 3-7% of Li2O; the components and the proportion of the abrasive layer are 23-40% of CBN and 23-40% of SiC, 20.3-29.8% of the bond, 0.1-0.3% of dextrin powder and 0.1-0.2% of walnut powder; and the components and the proportion of the transition layer are 64-76% of the SiC, 21.9-32.9% of the bond and 0.1-0.2% of the dextrin powder. By adopting the technical processes of mixing materials, molding a blank of the abrasive layer by compression, sintering the blank of the abrasive layer, configuring, determining and processing the dimension of matrix bond, bonding the abrasive layer with the matrix, carrying out rotation test, trimming the external circle and end face of the abrasive layer, inspecting the abrasive layer of the grinding wheel, carrying out dynamic balancing, processing the appearance, and the like, and by reducing the firing temperature of the ceramic bond, the problem that burning loss happens easily due to oxidation of the abrasive is solved, and the strength of the product is improved.

Description

Technical field: [0001] The invention relates to the technical field of abrasive tools and grinding, in particular to a CBN grinding wheel with low-temperature vitrified bond and a preparation process thereof. Background technique: [0002] We learned that CBN abrasive is a kind of superhard material, which plays a major grinding role in the grinding wheel as an abrasive, and the quality of the abrasive directly affects many performance indicators of the grinding wheel. But the most important thing in the structure of the grinding wheel is its organizational structure, which is also a bonding agent. The role of the binder is to disperse and hold the CBN abrasive. In the past, the CBN grinding wheel was not strong enough, the abrasive was easy to fall off, it was difficult to maintain the shape of the grinding wheel, and it was easy to cause the blockage of the grinding wheel. In addition, the sintering temperature of general ceramic products is above 1200°C. Since the firi...

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Problems solved by technology

In the past, the CBN grinding wheel was not strong enough, the abrasive was easy to fall off, it was difficult to maintain the shape of the grinding wheel, and it was easy to cause the blockage of the grinding wheel

In addition, the sintering temperature of general ceramic products is above 1200°C. Since the firing temperature of CBN abrasive itself is 1000°C, although the theoretical heat-resistant temperature of CBN abrasive is 1000°C, the CBN abrasive begins to produce a small amount of oxidation from 700°C, which is easy to cause burnout

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