Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1980-05-12
1981-12-22
Gilden, Leon
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72 16, 72 60, 100269A, B21B 3708
Patent
active
043064361
ABSTRACT:
An improvement to an apparatus for and method of making structures from at least one workpiece is disclosed. The prior art apparatus and method comprised a pair of dies which were clamped about the periphery of the at least one workpiece creating a gap therebetween. A pair of non-inflatable platens were then used to apply a force against the pair of dies further clamping the workpiece in place. The die assembly and workpiece were then heated to forming temperatures and thereafter the workpiece was formed within the pair of dies by fluid under pressure. Typically the forming was Superplastic Forming or Superplastic Forming/Diffusion Bonding. The improvement to the apparatus and method comprises producing an inflatable platen mounted between one of the dies and one of the non-inflatable platens, adapted to regulate the force applied by said pair of dies to said at least one workpiece. A sensor is provided mounted within the gap adapted to sense changes in the dimensions of the actual gap and provide a first output signal proportional thereto during the forming of the structure. A signal generator is provided for producing a second output signal proportional to a preferred gap dimension that is produced when said force is the minimum amount necessary for forming the at least one workpiece into the structure. A control system is provided to regulate the pressure level within the inflatable platen, and, therefore, the force applied to the pair of dies, using the first and second output signals such that the actual gap substantially equals the preferred gap during forming. In an alternate embodiment, a buffer platen is placed between the die assembly and inflatable platen to isolate the inflatable platen from the heat.
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Schulz David W.
Weisert Edward D.
Gilden Leon
Rockwell International Corporation
Silberberg Charles T.
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