| 摘要 |
PROBLEM TO BE SOLVED: To prevent chipping from generating in a cut groove edge by performing cutting by the use of a diamond blade having alminium as its binding agent in the case of cutting a fragile material with the diamond blade utilizing the electrophoresis phenomenon applying electric charge to ultrafine grinding particles in a liquid phase. SOLUTION: A cover 4 having a groove 3 in which working liquid (croidal silica) 2 including ultrafine abrasive grains (silica grains) 12 flows is set around a blade (diamond blade) 1 while the groove 3 is a negative electrode and a conductive portion on the outer circumference of the blade 1 is a positive electrode, and a groove to be worked of a workpiece 5 is ground and cut. In this case, in stead of a blade having cupper or iron as its binding agent a blade having aluminium as its binding agent is used. The cutting is performed under the condition where the rotational frequency of the blade is 3000 to 5000rpm, the flow of working liquid is 0.75 to 1.25L/cm<2> .min, and the application voltage is 30 to 50V. Accordingly, chipping generating in a cut groove edge is eliminated to make the cut surface a mirror face. |
