Development Of New-type Porous Metal-bonded Diamond Grinding Wheels

The porous metal bonded diamond wheels are attempted to solve the shortcoming of the traditional wheels,which will be easy to become sharp, the dressing and truing compared to no porous metal bonded diamond wheels, and the grinding temperature will decrease with the high thermal conductivity of the metal bond. The article based on the high temperature brazing technology with the fabrication technology of porous materials to produce porous metal-bonded diamond grinding tools. The creative work is as follows:1. Ni-Cr filler, high-temperature solid particle and vesicant were introduced into the diamond segments. And through choosing the effective technique and measure, the porous metal-bonded diamond grinding wheel was finished.2. The distribution of the pores in the porous metal bonded diamond segments was observed and the porosity was measured by the drain away liquid method. While the relationship of the porosity and components were detected. Moreover, the reason was also deeply analyzed. The transverse-rupture strength of the porous metal bonded diamond segments was measured by three-point bend to fail test. While the relationship of the transverse-rupture strength and the porosity was established. Moreover, the reason was also deeply analyzed.3. The fracture morphology and interface structure have been analyzed through scanning electron microscope (SEM). The results show that different carbides are formed on the interface between Ni-Cr filler and the diamond grains, while firm chemical metallurgy combine has been obtained.4. The grinding experiment of the porous metal-bonded diamond grinding wheel on alumina ceramic was carried out. The effects of grinding parameters on grinding force and the machined surface roughness were analyzed.