To provide a working method of a bore inner surface of an engine block for surely and easily improving working efficiency, and reducing equipment cost with a simple constitution.
A rough boring work process is performed for working an inner surface of a prepared hole B of a bore up to first shape accuracy, and next, while continuously performing cutting work by a working blade tool 3 arranged in a cutting tool 1 by allowing the cutting tool 1 to autorotate, a finishing boring work process is performed for cutting the inner surface of the prepared hole B up to second shape accuracy by revolvingly moving along the inner surface of the prepared hole B in a prescribed diameter, and afterwards, a finishing honing work process is performed for grinding the inner surface of the prepared hole B in desired shape accuracy. When performing the rough boring work process or the finishing boring work process, chamfer work is continuously performed by moving in the shaft direction while gradually changing a revolving moving diameter of the cutting tool 1 by an opening of an end part of the prepared hole B.
HASEGAWA TSUTOMU
KURACHI SHINJI
MUTO YUJI
MAKI KATSUNORI
Miyazaki Yoshio
Kaoru Onozuka
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