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Control of cavitation in superplastic forming through use of acoustic emission

  • US 4,936,128 A
  • Filed: 12/01/1989
  • Issued: 06/26/1990
  • Est. Priority Date: 12/01/1989
  • Status: Expired due to Fees
First Claim
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1. A method of forming a part from a blank of material in which the blank is disposed between opposing die structures, heated to a temperature range in which the blank exhibits superplastic characteristics and formed into a part by the application of a first fluid pressure against one side of the blank at a rate that minimizes the formation of cavities in the material of the blank and part while a second fluid pressure of an amount less than the first fluid pressure is applied against the other side of the blank, the improvement comprising:

  • sensing acoustic energy emitted by the onset of cavitation with the material of the blank, andchanging at least one of the above parameters until said cavitation in the material substantially reduces.

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