发明授权
- 专利标题： Vacuum die-casting machine with apparatus and method for controlling pressure behind piston
- 专利标题（中）： 具有控制活塞后压力的装置和方法的真空压铸机
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申请号： US754993申请日： 1991-09-06
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公开(公告)号： US5246055A公开(公告)日： 1993-09-21
- 发明人: James R. Fields , Lawrence W. Cisko , Robert C. Wallace
- 申请人： James R. Fields , Lawrence W. Cisko , Robert C. Wallace
- 申请人地址： PA Pittsburgh
- 专利权人： Aluminum Company of America
- 当前专利权人： Aluminum Company of America
- 当前专利权人地址： PA Pittsburgh
- 主分类号： B22D17/14
- IPC分类号： B22D17/14 ; B22D17/20 ; B22D17/30 ; B22D17/32 ; B22D41/50 ; C22B21/06 ; C22C21/02
摘要：
A vacuum die-casting machine has a bellows forming a sealed enclosure between the rear of the fill chamber and the piston rod. A vacuum is applied to the enclosure during evacuation of the die cavity and charging of the fill chamber with molten metal. As the piston moves forward, an inert gas at about atmospheric pressure is introduced into the enclosure and extends into the feed tube.
公开/授权文献
- US4648755A Multiple insert end mill 公开/授权日：1987-03-10
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