For about 50 years roll forming was the process of choice for making seat track channels at Dura Automotive Seat Systems, Stockton, Ill. While the process was high-speed, low-maintenance, and flexible, it also caused channel end flare, twist, and bow. While designers took these limitations into account and designed the product to be forgiving at the ends of the channels, several factors over the past decade have caused the company to use roll forming less and less.
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