Method for making press-working blanks with reduced ear occurren

Details Method for making press-working blanks with reduced ear occurren Method for making press-working blanks with reduced ear occurren

1975-05-07

1977-02-01

Lanham, C.W.

29180SS, 291835, B21D 5300

Patent

active

040056651

ABSTRACT:
A method for preparing a steel blank which is less susceptible to ear occurrence during its press-working into a pressed article, which comprising cutting a cold rolled steel sheet in a planar shape obtained by overlapping a circle having a diameter R and a square having a side length of about 13/14 R with their center points being at the same point and cutting the unoverlapped portions to form a blank with a periphery having alternating arcuate and straight edges. A blank is thus provided having less material due to the straight edges in those areas where large ears would otherwise occur during working.

REFERENCES:
patent: 3490124 (1970-01-01), Miller
patent: 3664890 (1972-05-01), Winter

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