Apparatus for forging of crankshafts in presses
First Claim
1. In an apparatus for forging a crankshaft from a bar, the combination comprising:
- a base;
a head mounted for reciprocal movement toward the base in a working stroke;
one movable upper die holder mounted on said head for sliding in a direction transverse to the head movement;
one movable lower die holder;
connectors articulately linking the lower die holder to the base, each connector having an upper end pivotally linked to the lower die holder and a lower end pivotally linked to the base;
drive means for coupling the upper and lower die holder so as to provide their simultaneous, synchronous movement;
an immovable lower die holder rigidly connected to the base;
an upper die holder which is immovable during the working stroke;
clamping means for connecting said upper immovable die holder to the immovable lower die holder;
two sets of die inserts each set having portions carried by respective upper and lower movable and immovable die holders, said die inserts being adapted to grip the bar on both sides of the site of a crank web to be forged; and
additional die inserts mounted between and to the immovable lower and upper die holders, said additional die inserts being fixedly spaced from said die inserts of said immovable lower and upper die holders so as to set the adjacent crankwebs at pre-selected twist angles upon clamping of said immovable lower and upper die holders.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for forging crankshafts comprises a base which consists of beams 4 and cross-members 12 and 25. The head 3 of the device is designed 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 equipped 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 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.
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Citations
7 Claims
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1. In an apparatus for forging a crankshaft from a bar, the combination comprising:
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a base; a head mounted for reciprocal movement toward the base in a working stroke; one movable upper die holder mounted on said head for sliding in a direction transverse to the head movement; one movable lower die holder; connectors articulately linking the lower die holder to the base, each connector having an upper end pivotally linked to the lower die holder and a lower end pivotally linked to the base; drive means for coupling the upper and lower die holder so as to provide their simultaneous, synchronous movement; an immovable lower die holder rigidly connected to the base; an upper die holder which is immovable during the working stroke; clamping means for connecting said upper immovable die holder to the immovable lower die holder; two sets of die inserts each set having portions carried by respective upper and lower movable and immovable die holders, said die inserts being adapted to grip the bar on both sides of the site of a crank web to be forged; and additional die inserts mounted between and to the immovable lower and upper die holders, said additional die inserts being fixedly spaced from said die inserts of said immovable lower and upper die holders so as to set the adjacent crankwebs at pre-selected twist angles upon clamping of said immovable lower and upper die holders. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification