| 摘要 |
<p>The objective of the present invention is to provide a cold deep hole forming device capable of forming, by the method of cold forging, deep hole for involute spline, etc. with high accuracy and in simple way, even in member to be formed partially different in thickness, comprising a supporting base 1A for supporting the member W to be formed and a punch 1B for forming deep hole H in the member W to be formed, realized in such a way that a clamp holder 3 is provided on the outer circumference of the punch 1B for forming deep hole in the member to be formed, that a clamp 2 composed by circumferentially disposing a plurality of split clamping pieces 21 is disposed in the clamp holder, and that, when forming deep hole H in the member W to be formed with the punch 1B, the clamping pieces 21 are made to move to the direction of the center under a fluid pressure, so as to constrain the member W to be formed at its outer circumference of the small diameter portion WT. <IMAGE></p> |
