FIELD: plastic metal working. SUBSTANCE: method of making heads of box wrenches comprises steps of deforming blank by positions. At shaping outer surface on last position, part of blank is pushed through reducing land of die for forming knurled surface at end side of square relief cavity and for punching hole. Square relief cavity is made by two steps: at first cavity whose cross section size is more than that of ready cavity is pressed out, then said cavity is finally shaped by moving metal radially towards center of blank at making knurled surface. EFFECT: enhanced efficiency.
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Authors
Dates
1997-06-10—Published
1995-09-04—Filed