发明授权
- 专利标题： Active hold-down for heat treating
- 专利标题（中）： 主动按压热处理
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申请号： US921573申请日： 1986-10-21
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公开(公告)号： US4721462A公开(公告)日： 1988-01-26
- 发明人: Earl R. Collins, Jr.
- 申请人： Earl R. Collins, Jr.
- 申请人地址： DC Washington
- 专利权人： The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
- 当前专利权人： The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
- 当前专利权人地址： DC Washington
- 主分类号： B25B11/00
- IPC分类号： B25B11/00 ; F27D5/00 ; F27D7/06
摘要：
A vacuum hold-down is described, for holding a thin film workpiece while it undergoes large temperature changes and corresponding dimensional changes, which permits creep of the workpiece to avoid damage thereto while still holding it on a support surface. The support surface has a multiplicity of holes arranged in a plurality of zones. The vacuum is repeatedly interrupted at the holes lying at different zones while it continues to be applied at the other zones, to permit creep of the workpiece at a zone when vacuum is not applied thereto.
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