Stack press

Details Stack press Stack press

B - Operations, Transporting

21

B

113/73

B21B 28/00 (2006.01) B21D 22/28 (2006.01) B21D 35/00 (2006.01) B21D 51/26 (2006.01)

Patent

CA 1222417

ABSTRACT OF THE DISCLOSURE Disclosed is a two level stacked press which provides for blanking and cupping in one section and drawing, redrawing and trimming in another section. The reason for separating the various operations is in order to keep the overall size of the press compact. That is to say that, the cut edge diameter for the blank is the largest dimension of the piece part during the progressive forming operations. If all of the operations were on one level in the press, the floor area for the press would be increased. By blanking and cupping in one level and drawiing and redrawing in another level, the area of the press in plan can be minimized. The area within the press required for blanking and cupping is as great as that for drawing and redrawing. Similarly, the strokings required for blanking and cupping are significantly shorter than the strokes required for drawing and redrawing. Thus, the press can be split into two sections but still be driven by a common crank shaft housed in a common crankcase and supported on common bearings so long as crank throws are provided for the stroking required for blanking and cupping and for the stroking for drawing and redrawing. Another advantage of the stack press construction is the ability to use one portion of the crank rotation to blank and cup and the other portion of the crank shaft stroke to draw and redraw. Thus, the overall loadings on the crank shaft and the press members are balanced and minimized.

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