Apparatus and method for processing piston

An apparatus for processing a piston, he apparatus comprising:

• a work attaching head that is disposed on a work bench and on which a piston material can be fixed;
• a work rotating device that rotates the work attaching head;
• a grinding wheel that is disposed on a grinding wheel bench;
• a grinding wheel rotating device that rotates the grinding wheel;
• a first moving mechanism that moves at least one of the work attaching head and the grinding wheel in a approaching/distanced direction thereof to change a distance between the piston material and a grinding surface of the grinding wheel;
• a second moving mechanism that moves at least one of the work attaching head and the grinding wheel in a rotational axis direction of the piston material that is perpendicular to the approaching/distanced direction to change a contact position between an outer circumferential surface of the piston material and the grinding surface;
• a rotational angle detector that detects a rotational angle of the work attaching head;
• a first position detector that detects a position of the grinding surface in the approaching/distanced direction;
• a second position detector that detects a position of the grinding surface in the rotational axis direction;
• and
• a controller that has target-position information of the grinding surface corresponding to a position on the outer circumferential surface of the piston material and controls the first and second moving mechanisms to grind the outer circumferential surface by the grinding wheel based on the target-position information.