Background technique:

As the force transmission and guiding element of the automobile system, the control arm transmits various forces acting on the wheels to the body, and at the same time ensures that the wheels move according to a certain trajectory. With the development of manufacturing technology and material technology, automobile control arms are gradually replaced by forging instead of traditional casting. The complete technological process of the aluminum alloy suspension control arm is generally blanking-rounding-medium frequency induction heating-roll forging-flattening and bending-secondary heating-die forging-hot edge cutting-solution-aging, but the existing The production process is easy to cause defects such as folding and shrinkage holes in the processed control arm, and the blank needs to be heated many times, and the processing efficiency is low.

Technical realization elements:

The technical problem to be solved by the present invention is to provide a forging method of an automobile aluminum alloy control arm, the control arm forged by the method has good shape and no defects such as folding and shrinkage cavity.

The solution that the present invention solves its technical problem is:

A method for forging an automobile aluminum alloy control arm, characterized in that it comprises the following steps:

(a), the extruded round bar is used as the blank;

(b) Heating the sawn billet to between 500°C and 520°C;

(c), the first roller forging: adopt the first roller forging die, the first roller forging die includes the first upper roller forging die and the first lower roller forging die that are arranged up and down, and the heated The billet is fed into the first forging die and positioned well. The first upper forging die and the first lower forging die are rotated to forge a section of the billet. The forged section of the billet changes from a circular section to an oval The cross-section is deformed to obtain the first-pass kiln forging;

(d), the second kun forging: adopt the second kun forging die, the second kun forging die includes the second upper kun forging die and the second lower kun forging die that are arranged up and down, and the first kun forging die The secondary forging is rotated 90° around its own axis and then sent into the second forging die and positioned well. The rotation of the second upper forging die and the second lower forging die makes the cross section of the first forging an ellipse One section is forged, and the first forging is deformed from an elliptical section to a flat section by the forging section of the first pass, thereby obtaining a second forging;

(e), flattening and bending: using a bending die, the bending die includes a bending lower die and a bending upper die that are arranged up and down, and the second pass forging is put into the bending die. The second kun forging is placed on the lower bending die, and the bending upper die moves downward. The upper surface of the second kun forging is compressed and the lower surface is pulled. The second kun forging is subjected to local extrusion and finally forming curved workpieces;

(f) Final forging forming: using a final forging die, said final forging die includes a final forging upper die and a final forging lower die that are arranged up and down, the curved workpiece is sent into the final forging die, and the curved workpiece is put into the final forging The lower mold is fixed and positioned, and the final forging upper mold moves downward, the bending workpiece undergoes plastic deformation, and finally the control arm is obtained.