A modulus of continuity for producing waist bush that appears for car

The utility model discloses an avoid a modulus of continuity for producing waist bush that appears for car of the easy fracture of bed charge in the whole course of working, comprises an upper die and a lower die, upward be provided with the drift on the mould, the lower mould be provided with with drift complex recess, the drift includes the well drift in material hole in two symmetric edges of bed charge upper punch expect the limit drift in holes and dash two symmetries, form four tensile strap between rim charge hole and the well material hole, wherein limit drift and well drift are in two stations, two stations near well material hole communicate with each other, the drift closes as an organic wholely and corresponds communicating well material hole in two, upward still be provided with after the drift on the mould and be used for the follow -up pressure head that extrudes the bed charge waist shape convex closure, 2 at least integer heads, waist shape drift and blanking head towards waist shape hole, st