METHOD OF HOLLOW PARTS PRODUCTION WITH STEPS ON EXTERNAL SURFACE AND COLD-UPSETTING TOOL FOR ITS IMPLEMENTATION Russian patent published in 2008 - IPC B21K21/08 B21J5/08 B21J13/02 

FIELD: technological processes.

SUBSTANCE: for parts production cold-upsetting tool is used in the form of multi-position unit. Unit includes five positions and contains puncheons, thrusters, assembled matrixes and strippers. Assembled matrix in the fourth position is installed motionlessly and is equipped with reduction step at the insert. Stripper of the fourth position is arranged with the opening, in which spring-loaded puncheon is installed. Cut billet is subjected to setting and calibration with leveling of butt ends and formation of conical marks. By means of further billet setting head is created. Then opening is pressed out in the billet and its external diameter is reduced with formation of step. Reduction of diameter is carried out in motionless matrix with insert, which has reduction step. For that purpose billet is displaced until it thrusts stripper with spring-loaded puncheon with its butt-end. Puncheon is installed in billet pressed out opening. Later billet is displaced together with puncheon and stripper via reduction step of matrix. After that billet opening is interweaved.

EFFECT: expansion of technological resources.

2 cl, 4 dwg