Ultra-smoothness grinding of glass with #140 metal bond diamond wheel

Glass is one of the most important materials in the optical industries. The high efficiency ultra-smoothness grinding technique of the glass has been strongly required. To improve the productivity, in our previous researches, the newly devised ultra-smoothness grinding method is proposed. By applying the new method to the horizontal surface grinding(1),2),3)), the surface roughness of cemented carbide tool, silicon carbide ceramic and so on is found to attain below 30nm (Rz) or 5nm (Ra) in the measuring area of 256 mu m x 256 mu m. As a result, the new method is ascertained to be useful for finishing near the ultra-smoothness surface. In this report, ultra-smoothness grinding of a glass is examined. The specification of metal bond diamond wheel used is the grain size of #140 and the concentration of 50, respectively. The 3D surface roughness of glass formed using the suitable grinding condition attains about 27nm(Rz) or 1.4nm(Ra).