| 摘要 |
<p>Draw processing flat-rolled sheet metal substrate preselectively precoated on each surface with organic and draw lubricant into one-piece can bodies ready for assembly into sanitary can packs. Cupping of precoated flat-rolled sheet metal can stock using preselected tooling configurations and clearance avoids any increase in side wall metal thickness gage. Tension elongation during redraw is controlled over side wall height by clamping solely between planar clamping surfaces. High production rate blanking and cupping (36) is achieved with out-of-phase simultaneous movement of cupping die and punch which provides for rapid discharge of cup-shaped work product (37), open-end-down on flange (41) at open end of cup. Surface area of the cavity entrance zone for each die is fabricated about multiple radii forming sharp edge about which coated can stock is drawn into each die cavity.</p> |
