According to the structure and the performance characteristics including high strength

high ductility and impact resistance

the indirect squeeze casting process scheme and the process parameters were determined.The lamp cover with300mm in diameter was successfully manufactured by 10 000kN horizontal squeeze casting machine.In addition

the microstructures and mechanical properties of the lamp cover manufactured were investigated by tensile testing

optical microscope and scanning electronic microscope.The results show that the aluminum alloy lamp covers have satisfied appearances and surface quality and absence of macro defects such as shrinkage porosity and cavity with the pouring temperature of 640

6

70℃

the mold temperature of 240℃

the casting pressure of 100MPa and the punching velocity of 0.10

0

.12m/s.After T6treatment

tensile strength and elongation of the lamp cover reach 297MPa and 9.4%

respectively

meeting the requirement.