Study of combined grinding on grooving of cemented carbide.

Abstract

It will be effective to combine electrochemical and electrodischarge removal actions with mechanical grinding in order to increase the productivity of materials which are difficult to machine. This method was tested on the groove grinding of cemented carbide. The influences of applied electric voltage on grinding force, wheel wear and grinding ratio were tested experimentally. As a result, it is known that the grinding ratio increases and reaches a maximum when a charge of 20 volts was applied. At that voltage both electrochemical and electrodischarge actions are recognized. At voltages lower than this, wheel wear increases and grinding ratio decreases due to the increase of mechanical action. At voltages higher than 20, wheel were also increases. This is caused by wheel damage due to severe electrodischarge. In order to get high grinding ratio and better surface roughness, it is effective to add reverse voltage. The frequent application of voltage makes electro-chemical and electrodischarge actions more significant.