FIELD: metallurgy.
SUBSTANCE: circular, rectangular, square or other shaped blanks shall be cut from the test sheet material with dimensions exceeding the dimensions of the rift placed on the holder in the plan prior to forming of the blank in a device with a punch, die and a holder in the test machine or press. On one or both surfaces of the blank an anti-friction film is glued with a hole or without it and with external dimensions both inside and outside the rift. At the same time the firm grip with the rift is done along the edge of the blank with one or two anti-friction films.
EFFECT: reduced labour and defect.
12 cl, 10 dwg
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