Ceramic metal composite binding agent grinding wheel and preparation method thereof

Abstract

The invention relates to a preparation method of a ceramic metal composite binding agent grinding wheel. The preparation method of the ceramic metal composite binding agent grinding wheel comprises the steps that (1), a liquid ceramic binding agent is prepared, specifically, a certain proportion of Al(NO3)3, H3BO3, LiNO3 and NaNO3 is dissolved in water, and then SiO2 sol is added to obtain the liquid ceramic binding agent; (2), a ceramic metal composite binding agent is prepared, specifically, diamond micro-powder and metal mixture powder are added to the liquid ceramic binding agent and mixedwell to obtain mixture slurry; (3), spray granulation is carried out, specifically, the mixture slurry obtained from the step (2) is subjected to spray granulation to prepare a molding material; and(4), sinter molding and post-processing are carried out, specifically, the molding material obtained from the step (3) is pressed and molded, sintered, trimmed and sharp fixed to obtain the ceramic metal composite binding agent grinding wheel. According to the preparation method of the ceramic metal composite binding agent grinding wheel, the microstructure consistency of the grinding wheel is improved, the phenomena of large dents, S-shaped cutting joints, burn, unstable cutting quality, uneven consumption speed, falling off of large pieces and the like caused by the prior art are solved, andmeanwhile, the grinding wheel further has higher strength and longer service life.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a ceramic-metal composite bond grinding wheel and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of high-speed grinding and ultra-precision grinding technology, higher requirements have been put forward for grinding wheels. Ceramic resin bonded grinding wheels can no longer meet production needs. Metal bonded grinding wheels can withstand large Grinding pressure and other characteristics have been widely used in the grinding of difficult-to-machine materials such as engineering ceramics, optical glass, and hard alloys. However, metal bond grinding wheels have poor self-sharpening properties, and ceramic bonds are often added to improve self-sharpening properties, while traditional solid ceramic bonds are obtained by solid-phase mechanical crushing and sieving to obtain powders with a particle size o...

AI Technical Summary

Problems solved by technology

However, metal bond grinding wheels have poor self-sharpening properties, and ceramic bonds are often added to improve self-sharpening properties, while traditional solid ceramic bonds are obtained by solid-phase mechanical crushing and sieving to obtain powders with a particle size of 1-100 μm. When the bonded grinding wheel is used, it will form a non-uniform structure centered on the bond, which cannot effectively coat the abrasive, reduce the strength of the bond and the holding force of the abrasive, and the larger piece of vitrified bond after sintering is easy to cut during cutting. Quality problems such as chipping

In addition, the composite binder adopts the traditional ball milling mixing method. First, the vitrified bond powder, metal micropowder, and abrasives are relatively fine, with poor fluidity, and are prone to agglomeration. The force is large, and it is not easy to mix evenly. The third is that the density and particle size of the metal micropowder and the abrasive are quite different. The microstructure of the grinding wheel is quite different, which leads to large chipping, serpentine kerf, burns, unstable cutting quality, uneven consumption speed, and large pieces falling off during the application process.

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