Patent ID: 8297097

Claim:
A closing method for closing an open end of a work piece made of a pipe material by pressing a rotating die against the work piece rotating in a position which is offset from the die by a predetermined distance, comprising: holding the work piece in a chuck spindle which drives the work piece to rotate; moving the chuck spindle by a chuck spindle moving device in a horizontal direction orthogonal to a rotary axis of the chuck spindle; stopping the movement of the chuck spindle by a slide stopper in a predetermined horizontal offset position which is horizontally offset to the die by the predetermined distance while alleviating an impact generated when the chuck spindle moving device abuts against the slide stopper by a damper, wherein the damper is separated and spaced apart from the slide stopper, and the chuck spindle moving device first comes in contact with the damper and then comes in contact with the slide stopper; and pressing the rotating die against the rotating work piece in the predetermined horizontal offset position, wherein the chuck spindle moving device is connected with the chuck spindle, such that the rotary axis of the chuck spindle is maintained parallel with an axis of the die while the chuck spindle is moved to the offset position.