초록 ▼

The invention herein relates to a method of and apparatus forming a reinforced pressure resistant can end by gripping a central panel of a metallic blank between an axially aligned reform pad and an indent ring, the reform pad being in internal concentric relationship to a draw punch and the indent

The invention herein relates to a method of and apparatus forming a reinforced pressure resistant can end by gripping a central panel of a metallic blank between an axially aligned reform pad and an indent ring, the reform pad being in internal concentric relationship to a draw punch and the indent ring being in internal concentric relationship to a lift ring, the draw punch being movable in a first direction to exert first forces against a peripheral edge portion of the blank in a first direction to form the peripheral edge portion out of the plane of the central panel and shape the blank into a generally flanged cup-shaped configuration defined by the central panel, a radius, a frusto-conical wall and an annular flange, and while the central panel is still gripped, second forces are exerted beyond the first forces and in a second direction opposite the first direction to form at least a part of the metal of the radius, in the absence of restraint or constraint, out of the plane of the central panel and to a side thereof opposite the flange to form an annular reinforcing countersink radius.

대표청구항 ▼

A method of forming a reinforced pressure-resistant can end comprising the steps of providing a generally planar metallic blank having a central portion and an outboard peripheral edge portion, exerting first forces against the peripheral edge portion of the blank in a first direction to deform the

A method of forming a reinforced pressure-resistant can end comprising the steps of providing a generally planar metallic blank having a central portion and an outboard peripheral edge portion, exerting first forces against the peripheral edge portion of the blank in a first direction to deform the peripheral edge portion out of the plane of the central portion and shape the blank into a generally flanged cup-shaped configuration defined by the central portion, a radius, a frusto-conical wall and a shallow annular channel-like flange opening in a direction toward the central portion, and exerting second forces greater than the first forces against the flange in a second direction opposite the first direction while gripping the central portion to deform at least a part of the metal of the radius in the absence of restraint out of the plane of the central portion plane, to a side thereof opposite the flange, and in the same direction as the opening direction of the flange; and the first and second directions defining a single reciprocal opposing path of force exertion by the first and second forces.