Patent ID: 8302449
Filing Date: 2012-11-06
Classification: B21D

Abstract:
1. A closing method for closing an open end of a work piece by pressing a die against the work piece rotating about a rotary axis, comprising: driving the work piece to rotate using a chuck spindle; supporting the rotating work piece using a chuck sliding support mechanism so that the rotating work piece can move in a direction of the rotary axis, the chuck sliding support mechanism comprising a bearing case that rotatably supports an outer chuck holding an outer periphery of the work piece, a support case that supports the bearing case so that the bearing case can slide in the direction of the rotary axis, and a return spring that biases the bearing case toward the die; and causing the work piece, which is moved by a load applied from the die, to abut against a thrust stopper to support the work piece in a predetermined closing position along the rotary axis.