Bending method and single elongation value specifying device of bending apparatus
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United States of America Patent
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Dec 21, 2004
Grant Date -
Jun 5, 2003
app pub date -
Dec 30, 2002
filing date -
Jul 5, 2000
priority date (Note) -
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Abstract
A bending apparatus for bending a workpiece W according to cooperation of a punch P and a die D previously carries out various step bending or makes simulation of step bending, and calculates an approximation formula based on a correlation between a ratio % of a one-sided elongation value .alpha. to a plate thickness t and a step bending angle .theta. based on a relationship among the plate thickness t, the step bending angle .theta. and the one-sided elongation value .alpha. of the workpiece W so as to store the formula as a database. The more accurate one-sided elongation value .alpha. of the step bending is calculated by small parameters including only two data including the plate thickness t and the step bending angle .theta. previously input at the time of actual bending based on the approximation formula in the data base so that the bending is carried out easily.
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