FIELD: cold sheet forming processes and equipment.
SUBSTANCE: die set includes punch, die with constriction lips and holder with recesses for lips. Upper surface of constriction lip is equidistant to pressing surface with protrusion near constriction edge of die with height selected according to thickness of initial blank at taking into account positive allowance for sheet thickness and with radius equal to constriction radius of die. Recesses of holder for constriction lips have radius selected according thickness of initial blank at taking into account positive allowance for sheet thickness.
EFFECT: increased braking degree, improved tension intensity of blank metal.
2 dwg
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