FIELD: sheet forming processes and equipment, possibly part drawing procedures and apparatuses.
SUBSTANCE: die set includes punch, die with constriction lip, holder and constriction rib. The last is secured to holder having recess for constriction lip of die. Inner surface of constriction rib serves as wall of recess. Die also has recess for constriction rib; said recess is arranged just behind constriction lip. Constriction rib is arranged with gap relative to constriction lip. Values of said gap is equal to thickness of formed metal while taking into account positive allowance by thickness. Lower edge of constriction rib enters recess of die at limit lower position of die set by value exceeding thickness of formed metal.
EFFECT: enhanced quality of formed parts, lowered metal consumption.
2 dwg
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RU2201830C2 |
