FIELD: plastic metal working, namely tools for cold heading at making rod parts with different-shape heads in cold heading automatic machines. SUBSTANCE: tool unit includes trimming punch with axial opening and block mounted in such a way that its one end is in contact with end of punch. Block has opening coaxial relative to opening of punch and recess on its end remote from punch. Annular damper engaging with knocking out member is placed in recess of block. Knocking out member is in the form of rod with sleeve pressed onto its one end and it is arranged in openings of block and punch. Damper includes stepped ring placed in recess of block and resting by its end at side of large outer diameter upon bottom of block recess and additional ring. The last rests upon large-diameter end of stepped ring at side of its small diameter. Outer small-diameter surface of stepped ring and inner surface of additional ring form free cavity. Pressed-on sleeve of knocking out member engages with end of stepped ring at side of its small-diameter portion. EFFECT: improved design providing reduced labor consumption at making tool unit. 1 dwg
