Introduction to forging method of aluminum alloy wheel hub

　　After forging and heat treatment, the tensile strength is 570 MPa, the yield strength is 540 MPa, and the elongation is 15%. Compared with the wheel hub of the same specification, the weight can be reduced to 17.2kg, greatly reducing the weight of the product. Through the anti-oxidation treatment of the product, the problem of easy oxidation of the aluminum alloy wheel hub is effectively solved It can meet the requirements of existing freight cars for wheel hub.

　　At present, the aluminum alloy wheel forged in China adopts 6061 aluminum alloy (LD30). Compared with the traditional steel wheel, it has the advantages of light weight, beautiful appearance and good heat dissipation performance. However, due to the limitation of 6061 material, the good mechanical properties can only reach 350Mpa tensile strength, 320MPa yield strength and 12% elongation under the common forging method The finished product of truck hub is about 25kg, so its tensile strength, yield strength, elongation and weight can not meet the requirements of existing truck hub.

　　Forging: the front surface of the casting bar is pre forged with a press forging machine to form a bowl, and then the back of the casting bar is forged once with a press forging machine to form a barrel shape. The casting bar is rolled into a forging blank with a spinning machine, and the forging blank is shaped like a hub edge.

　　Heat treatment: solid solution treatment for forging 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.