B - Operations – Transporting – 21 – J
Patent
B - Operations, Transporting
21
J
78/3
B21J 5/00 (2006.01) B21K 1/08 (2006.01)
Patent
CA 1228253
ABSTRACT A method and an apparatus for forging crankshafts especially on presses comprising forming only one crank web during one working stroke in such a way that a hot bar portion is clamped in two places situated at some distance which are destined to be the crankshafts main bearing journal and adjacent crank pin in the finished product. Between these places a bar portion is upset lengthwise to the bar axis and simultaneously bent and joggled radially to this axis. At the beginning of the working stroke the upsetting velocity is higher than the bending velocity,whereas at the end of the working stroke the upsetting velocity is lower than the joggling one. The following crank webs are forged and directed at proper twist angle during successive working strokes of the press crosshead. The device for orging crankshafts by this method comprises a base which consists of beams 4 and cross- -members 12 and 25. The head 3 of the device is assigned for reciprocal movement in relation to the base. Between head 3 and parts 4 and 25 of the base there is a pair of movable, mutually coupled die holders 5 and 8, from which the top die holder 5 is led perpendicularly or at an oblique angle in relation to the head movement and the bottom die holder 8 is connected with the base by means of articulated connectors 6 and 7. Clamping die inserts 10 and 11 for gripping the forged material are fastened in die holders 5 and 8. The device is also equiped with a second pair of die holders 13, 12, 12a, 4d, which remain stationary and are fixed to the base during the working stroke of the press by - 2 - means of a clamping mechanism 14 and 15. Die inserts 22 and 23 for forming crank webs and angle die inserts 17, 18 and 20 for setting crank webs at proper twist angles are mounted into the said stationary pair of die holders.
469512
Instytut Obrobki Plastycznej
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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