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In-die ejection force measurement in forming operations

  • US 5,872,316 A
  • Filed: 10/17/1997
  • Issued: 02/16/1999
  • Est. Priority Date: 01/21/1996
  • Status: Expired due to Fees
First Claim
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1. A method of estimating the non-measurable knock-out tonnage associated with the ejection of a part from a die set, the method comprising the steps of:

  • embedding a strain or force sensor in a suitable component of the die set in the flux of the force induced by the part knock-out, the sensor outputting an electrical signal which is proportional to the strain or force caused by the knock-out tonnage;

    passing the electrical signal to an inverse filter, whose function is to reconstruct a time profile of the knock-out tonnage causing the actual instantaneous die strain or force measured by the sensor; and

    scaling the reconstructed form to obtain an accurate estimate of the non-measurable knock-out tonnage.

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