FIELD: machine building.
SUBSTANCE: punch device consists of puncheon, matrixes and holders of sample edges. The punch device is installed at punching equipment; as measuring instruments there are applied three or five indicators and protractors of increased accuracy evaluating linear and angular parametres of a sample upon unloading. All modifications of the disclosed punch device correspond to process punches for bending sheet material by means of puncheon, matrixes and holders and facilitate high accurate determination of spring action angle and such ultimate parametres as maximum allowed bend angle and minimum allowed radius of bend till formation of a crack on the sample, also a kind of the crack and nature of material destruction upon bending.
EFFECT: upgraded accuracy.
4 cl, 5 dwg
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