METHOD FOR MANUFACTURING OF PIERCER PLUG Russian patent published in 2023 - IPC B21K5/02 B21J13/02 

FIELD: pressure processing of metals.

SUBSTANCE: invention can be used in manufacturing of piercer plug. At the first transition, the original blank is upset to form the input cone of the blank. At the second transition, by direct extrusion, a conical blank is obtained without an end protrusion with a height equal to 0.75-0.90 of the height of the finished plug. The maximum cone diameter in the upper part is equal to 0.95-0.98 of the plug diameter, in the lower part - 1.0-1.3 of the plug diameter adjacent to the end shoulder of the plug. In the middle part, the diameter is 0.7-0.9 of the diameter of the finished plug in the corresponding section. At the third transition, the combined extrusion of the inner cavity of the plug and the end protrusion is performed, at the fourth transition - the final shaping by open stamping of the rear conical section of the plug.

EFFECT: reduction in technological effort, increase of durability of the piercing tool, and increase of the depth of the plug cavity.

4 cl, 5 dwg