自動車エンジンのシリンダ内径部分（図1）は，エンジンの出力や燃費といった性能を左右するピストンの往復運動を支えており，より高性能を引き出すために高精度な仕上げ加工を要する．その処理を行う加工法としてホーニング加工が広く採用されている．%We have developed a new machining method, the ELID honing method (Electrolytic In-Process Dressing Honing Method), by applying the principles of "ELID grinding". The method was put into practical use on our machining lines in the engine shop, doing the finishing processes on the inner surfaces of cylinder bores. Using this new method, we were able to reduce processing time by 50%. In addition, we were able to improve the accuracy and consistency of each cylinder bore's inner surface.
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