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US 4,188,811 AGranted
Metal forming methods
AssigneeChem-tronics, Inc.
InventorDaniel J. Brimm
Life of this patent
Estimating the term…
Abstract
Methods for shaping metallic workpieces which utilize a single faced die and the use of heat and pressure to conform the article to the shape of the die surface by creep forming.
Claims17
A process for altering the shape of a metallic workpiece which comprises the steps of:
- placing the workpiece on the face of a die which face has a configuration wanted in the workpiece and concurrently heating said workpiece and applying pressure thereto via a compliant body composed of discrete pieces of a heat resistant, pressure transmitting material and located on that side of the workpiece opposite the die, the temperature to which the workpiece is heated and the pressure applied thereto being so correlated as to cause the workpiece metal to flow plastically at a stress below its yield strength into contact with the face of said die to thereby impart the wanted configuration to the workpiece.
A process for altering the shape of a metallic workpiece which includes the steps of:
- providing a single die having a face with a contour that is wanted in said workpiece;
- housing said die in a retort means with the die face exposed;
- disposing the workpiece in said retort in an abutting relationship with said die face;
- covering said workpiece with a first sheet of a flexible, heat resistant material to thereby isolate said workpiece from contact by foreign material;
- disposing on the side of said sheet opposite said workpiece a compliant body composed of discrete pieces of a heat resistant, pressure transmitting material;
- isolating the interior of the retort from the ambient atmosphere by covering said body of pressure transmitting material with a second sheet of flexible material spanning said retort;
- applying pressure to said workpiece by creating a pressure differential across said second sheet of flexible material;
- and heating said workpiece at a selected forming temperature, the temperature at which the workpiece is heated and the pressure applied thereto being so correlated as to cause the workpiece metal to flow plastically at a stress below its yield strength into contact with the face of said die to thereby impart the wanted contour to the workpiece.
5 more elements
Dependencies are inferred from the claim text.