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公开(公告)号：US3567524A
公开(公告)日：1971-03-02
申请号：US3567524D
申请日：1968-12-13
Applicant: IBM
Inventor： COOK JACKIE L , RALSTON WILLIAM G , TOBEN BERNARD E
CPC classification number: C22F1/165 , B29C51/427 , B29C67/00 , Y10S72/709 , Y10S148/902
Abstract: WALL THINNNING OF MOLDINGS MADE BY PRESSURE DEFORMATION IS AVOIDED BY LOCALLY PRECONDITIONING THE MATERIAL STRUCTURE OF A SHEET OF SUITABLE MATERIAL, FOR EXAMPLE, A SUPERPLASTIC METAL. THE PRECONDITIONING INCLUDES A HEAT TREATMENT OF THE MATERIAL STRUCTURE IN SELECTED PORTIONS OF THE SHEET TO REDUCE THE STRAIN PLASTICITY IN THESE PORTIONS DURING THE FORMING PROCESS.
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