Sheet Metal Testing Machines
These testing machines (type BUP) are used to determine and evaluate sheet metal properties.
Typical test methods include Erichsen cupping tests (EN ISO 20482), in which a hemispherical punch is pressed into a clamped test piece until a crack appears. There is no in-flow of the sheet metal.
The drawing formability of the sheet metal is determined from the punch penetration depth. Another test method frequently used is the earing test to EN 1669. In this test circular blanks are punched or inserted and drawn into cups (metal in-flow). The deep-drawing characteristics of the metal are determined via the percentage ear height ratio.
Other metal-forming test methods include square cup tests, hole expansion tests, FLC tests and bulge tests.
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