Peripheral electrochemical grinding of sintered carbides — Effect on surface finish

Abstract Peripheral electrochemical grinding was studied on eight typical commercially available sintered carbide tool grades, with emphasis on surface integrity. The different wheel-workpiece regions — the “contact” region, characterized by a simultaneous electrochemical and abrasive action, and the “after-wheel” region in which only the electrochemical aspect is present — were examined with a microscope. A wide range of practical working conditions was covered for additional data. Geometrical surface parameters such as overcut and surface roughness were related to those of the main process. Electrochemical surface parameters such as selective etching, oxide layer formation and local activation were evaluated by optical and scanning electron microscopy. An appropriate process mechanism was suggested on the basis of the results.