A process in which material is folded back on itself or over a mating part. This is a multistage forming operation. First, a sharp-angle bend is made ; next, the bend is closed using a flat punch and a die. See teardrop hem, rope hem, and open hem.
North America's leading magazine for the metal forming and fabricating industry, delivering news, technical articles, and case histories. Print subscriptions are free to qualified persons in North America involved in metal forming and fabricating.
TheFabricator.com provides metal fabrication professionals with market news, the industry's best articles, product news, and conference information from the Fabricators & Manufacturers Association, Intl.