The metalforming industry has many simulative test parts that laboratories use for predicting the formability of similar but much larger size configurations in actual stampings. Examples include Olsen stretch, limiting dome height, 4-in.-dia. hemispherical dome, Swift cup, Fukui conical, hole expansion, hydraulic bulge, Erichsen stretch and numerous bending operations. Historically, these tests have been used more in Europe and Asia than in North America. With the current intermingling of global industries, all groups using these tests should be aware of their deficiencies; the following discussion should generate great concern about the ability of lab tests to predict the performance of full-size stampings.
展开▼
