초록 ▼

An improved method and apparatus for deep drawing metal containers is disclosed in which flat sheet metal blanks are initially drawn into shallow cups having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall and a curved transition section joining the bottom wall an

An improved method and apparatus for deep drawing metal containers is disclosed in which flat sheet metal blanks are initially drawn into shallow cups having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall and a curved transition section joining the bottom wall and sidewall. A redraw sleeve adapted to fit into and support the cups has a first annular clamping surface on its free end contoured and arranged to engage the transition section and the adjacent annular peripheral portion of the bottom wall of a cup. An annular redraw die is supported for movement from a retracted position spaced from the redraw sleeve to a clamping position cooperating with the redraw sleeve to clamp and hold the cups during redrawing. The redraw die has a second clamping surface contoured to engage the outer surface of the transition section and the adjacent annular peripheral portion of the bottom wall of a cup supported on the redraw sleeve. One of the clamping surfaces is defined by an annular clamping surface portion on an outer and at least one inner concentric ring member, with the clamping surface portion on the outer ring member being adapted to engage and clamp the transition section. A male die engages the bottom wall of a cup clamped between the redraw sleeve and redraw die to redraw the clamped cup. The annular ring members each apply a clamping load to a cup, and preferably, the load applied by the outer ring member is transferred to the inner ring member as the cup is drawn inwardly past the outer ring member.

대표청구항 ▼

Apparatus for forming a deep drawn metal container body by redrawing a drawn cup having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall, and a curved transition section joining the sidewall and bottom wall, the apparatus comprising, annular redraw sleeve means hav

Apparatus for forming a deep drawn metal container body by redrawing a drawn cup having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall, and a curved transition section joining the sidewall and bottom wall, the apparatus comprising, annular redraw sleeve means having a free end adapted to fit within and support a drawn cup, said free end having a first annular clamping surface thereon contoured and arranged to engage the inner surface of the transition section and the adjacent annular peripheral portion of the bottom wall of a drawn cup supported on the redraw sleeve means, annular redraw die means having a second annular clamping surface thereon in axially aligned opposed relation to said first clamping surface, said second clamping surface being contoured and arranged to engage the outer surface of said transition section and the adjacent annular peripheral portion of the bottom wall of a drawn cup supported on said redraw sleeve means, one of said annular clamping surfaces being defined by an annular clamping surface portion on each of at least two concentric ring members with the annular clamping surface portion on the outer said ring member being contoured to engage and clamp the curved transition section of a cup, means for moving said annular redraw sleeve means and said annular redraw die means relative to one another to clamp the transition section and the adjacent bottom wall portion of a cup supported on said redraw sleeve means, and male die means movable relative to said annular redraw die means and said annular redraw sleeve means to progressively draw a clamped cup from between said first and second clamping surfaced through said redraw die means to redraw the cup into a deep drawn container body.