Clamping device for bending press and bending press provided with the same

A bending press system comprising:

• a lower die which is disposed on a base through a cushion pin and movable up and down through the cushion pin, the lower die has a curvature forming surface at an upper side for forming a curvature to a pipe which is mounted on the lower die;
• an upper die disposed above the base and movable up and down;
• a clamping die fixed on the base and having a space formed within the clamping die;
• a clamping holder rotatably disposed within the space of the clamping die around a rotation shaft which is a part of the clamping holder;
• an upper cam block and a lower cam block respectively disposed within the clamping holder and slidable along a horizontal direction, the upper cam block and the lower cam block respectively have a cam slant surface formed at a front side of the upper cam block and the lower cam block respectively;
• an upper clamping block and a lower clamping block respectively having a slip slant surface which is slantedly formed for contacting the cam slant surface and on which the upper cam block and the lower cam block slide, and the upper clamping block and the lower clamping block directly clamping an end of the pipe disposed therebetween by sliding along a slant direction of the clamping holder;
• and
• a pressing unit pressing the upper cam block and the lower cam block.