FFJournal April 2014 : Page 39

The operator uses automation control to adjust press feed. Capitol produced these stamp-ings for an OEM customer off a two-out die it designed and built. looked at our operation and talked to us about the parts we needed to make for this program, but we were also asked to think about what parts we might make down the road,” he says. The Seyi distributor per-formed an on-site review of the project and included Capitol’s input in its evalu-ation. Analysis revealed that reverse load and other performance variables dictated a custom configuration versus a simple stock machine. “Tooling, annual part volume and part processing always dictate the press,” says Rick Wenzel (no relation to Gary), presi-dent of BDC Machinery. The Nekoosa, Wis., company provides the metalworking industry with full systems integration, in-stallation, service and support for a range of product lines including presses, feed lines, material handling, automation and scrap removal. Capitol’s application called for blanking circles from hot-rolled pickled and oiled (HRPO) and draw quality steels up to 9 gauge and in diameters of 3 in. to 11 in. A typical split steel pulley is stamped, split and a hub or insert welded to the pulley’s center. “It’s a specialized product for us,” says Gary Wenzel. “There are maybe a dozen commercial and general contract manufacturers that use this technology. Lighter, yet stronger than cast iron, split-steel pulleys offer increased strength, reliability and durability on components for end products like mowers. Reverse tonnage or snap through—a performance variable easily overlooked by stampers—results when a punch breaks through the material during blanking. Factors like material type, hardness and thickness, punch-to-die clear-ances and punch velocity, determine how much reverse tonnage is generated. Indus-try standards require that presses are designed to accept a reverse tonnage load that does not exceed 10 percent of the max-imum forward capacity of the press. “To properly size a press you have to consider both reverse load and forward load,” Rick Wenzel says. “For Capitol we verified reverse and forward load based on April 2014 FFJournal ® 39

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