B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 37/02 (2006.01) B21D 5/04 (2006.01) B21D 22/08 (2006.01)
Patent
CA 2345973
A slight pivoting movement makes a rotary cam out of a predetermined formin g position, making an unwanted step in a curved surface of the work or making un able to form into an accurate curve. Sometimes, providing a product of accuracy in the order of 1/100 mm was difficult, or it was impossible to provide a forme d sheet metal product of a high quality. The present invention aims to maintain the rotary cam at a predetermined forming position thereby providing a formed s heet metal product of a high quality. The present provides a negative-angle forming die comprising a lower die ha lf having a supporting portion for placing a sheet metal work, and an upper die half to be lowered straightly downward onto the lower die half for forming the w ork, an intrusion forming portion formed in the lower die half at an edge portio n near the supporting portion inward of a downward stroke line of the upper die half, a rotary cam rotatably provided in the lower die half, a slide cam includi ng an intrusion forming portion and slidably opposed to the rotary cam, and an a utomatic retractor provided in the lower die half for pivoting the rotary cam ba ck to a position thereby allowing the work to be taken out of the lower die half after a forming operation, the work placed on the supporting portion of the low er die half being formed by the intrusion forming portion of the rotary cam and the intrusion forming portion of the slide cam, the slide cam forming the work b y sliding, the automatic retractor pivoting back the rotary cam after the formin g operation for allowing the work to be taken out of the lower die half, wherein the rotary cam has two ends each including a supporting shaft projecting theref rom, the supporting shafts being supported by the lower die half for rotatably s upporting the rotary cam, the intrusion forming portion of the rotary cam having a lower portion formed with a receiving portion, a J-shaped lock bar having an engaging portion for engagements with the receiving portion being slidably dispos ed below the rotary cam, the lock bar being urged by a returning urge provider i n a direction away from a forming direction, the slide cam being made capable of urging the lock bar in a direction of the intrusion forming by an urge provider providing an urge greater than the urge from the returning urge provider, for m oving the lock bar against the urge from the returning urge provider thereby eng aging the rotary cam with the lock bar at a time of the intrusion forming perfor med by the slide cam and the rotary cam.
Marks & Clerk
Umix Co. Ltd.
LandOfFree
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