Apparatus for cold forming metal parts

Claim 1

Apparatus for cold forming cylindrical metal blanks into parts having a central body and radial extensions, said apparatus comprising a die having plural die sectors arranged when brought together to define a chamber of the shape of the part to be formed, means for bringing said die sectors together, punches operable to penetrate through opposed entrances evenly into a central through cavity of shape corresponding to the central body of the part to be formed, said punches being adapted to drive blank metal from said central cavity towards radial cavities of shape corresponding to the radial extensions of the part to be formed; wherein the improvement comprises: a. said die sectors being of shortened axial height in their radial forming and extrusion zone: b. die carrier members for carrying said die sectors, and quick fastening and release means for fastening said die sectors to their associated die carrier members; c. guide bushes being disposed at the entrances to said central cavity and coaxial with said punches, said guide bushes being adapted to restrain compressed blank metal radially and channel its plastic flow towards said central cavity, and means for forcefully urging said guide bushes against said dies sectors when said die sectors are brought together.