The closed forging process of the outer ring of
automobile wheel rim
includes cutting: the blank is made by sawing process, heating: the blank is heated to 1100~1400℃, upsetting: the blank is upsetting on the upsetting equipment to obtain a drum-shaped blank, pre-forging: The drum-shaped blank is made of pre-forged parts through the pre-forged die, precision forging: The pre-forged parts are made of forgings through precision forging dies and hot forging machines.
The sawing process can better control the accuracy of the blank blank, reduce the burrs of the forgings, make the quality difference between the blank and the final forging smaller, and reduce the loss of raw materials. The forging process adopts a 2500-ton hot die forging press, which is formed by a cavity forging process.
The weight difference between the blank and the forging is controlled within 0.3% during the blanking period, which controls the cutting accuracy, reduces the generation of burrs in the forging, and reduces the waste of raw materials. When designing the forging die, the upper die is designed as a punch, and the lower die extends to the periphery of the cavity, and the guide hole is designed.
The
aluminum alloy wheels forged
in our country use 6061 grade aluminum alloy (LD30). Compared with traditional steel wheels, they have the advantages of light weight, beautiful appearance, and good heat dissipation performance. However, due to the limitations of 6061 material, under the existing commonly used forging methods, its good mechanical properties can only reach tensile strength of 350Mpa, yield strength of 320MPa, elongation of about 12%, a piece of 6061 aluminum alloy truck wheel finished product is about 25kg, so its tensile strength, yield strength, elongation and weight can no longer meet the requirements of existing trucks for wheels.
Forging: The front surface of the cast rod is pre-forged with a pressure forging machine, forged into a bowl shape, and then the back of the cast rod is forged once with a pressure forging machine, forged into a cylindrical shape, and the cast rod is rolled into a forged billet with a spinning machine. The forged billet is in the shape of the edge of the rim.
Heat treatment: solid solution treatment of forged billet, solution temperature 465-475℃, solution time 2-3 hours, quenching within 15 seconds after solution treatment, quenching temperature 40-60°C, time 85-95 seconds, aging treatment after quenching, aging temperature 115-125°C, aging time 22-24 hours.
