Bending repeatability of thin materials

Bending repeatability of thin materials
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Posted by: kennya ^®

02/22/2006, 15:57:00

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I was wondering how I could determine the repeatability of the bends in thin (approx .003" x .070" cross section by approx .500" long) strips of titanium, aluminum, copper, etc over time (over 250,000 individual bends). There would be one bend per strip, that bend would be at 90 degrees, and the bend would be perpendicular to the long dimension of the strip. It is my gut feel that there is an inherent variability from one bend to the next bend and this variability could increase from one lot of material to the next lot of material (i.e. one lot of copper to the next lot of copper). Also, of course, the bend angle will change as the die tooling wears.
Are there some standards or calculation methods published somewhere that could be used to determine what variations you could expect to see from part to part when, for example, you bend .003" thick copper at 90 degrees (90 +/- 3 degrees, etc)? I would appreciate any help anyone could give me in locating this type of information. Thanks.

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