Research on the forming process square shape of the super-thin wall housing case by newly made light-alloy matal with the high mechanical property

采用半固态铸造AC4CH铝合金(以下简称SS)进行了研究。在此基础上，采用等通道转角挤压的方法制备了超细晶金属(以下简称SS-ECAP)。通过冲击成型薄壁壳体的方法对这些试验材料的成形性进行了评估。这种方法是如何对体积较轻的金属施加高速冲击载荷，并通过高压从狭窄的间隙向后挤压。结果表明，AC4CH铝合金经半固态铸造和ECAP工艺变质处理后，不仅力学性能得到改善，而且冲击加工的加工性能也得到了改善。虽然已知可以稳定地执行冲击挤压工艺以生产大于0.7 mm的厚度，但是可以由SS-ECAP材料形成厚度为0.4 mm的超薄壁方形截面的壳体。

Semi-solid casting of AC4CH aluminum alloy (hereinafter, SS) was used for this research. Furthermore, ultrafine-grained metal (hereinafter, SS-ECAP) was fabricated by Equal-Channel Angular Pressing using SS material. Formability of these test materials was evaluated by an impact molding method to form thin-walled housing. This method is how to give impact load to the light weight metal of bulk at high speed, and extrude to backward from narrow clearance by high pressure. As a result, AC4CH aluminum alloy modified by semi-solid casting and ECAP processing achieve the improvement in not only the mechanical property but also the workability in impact process. Although it is known that the impact extrusion process can be performed stably to produce the thickness larger than 0.7 mm, a housing having super-thin walled square cross-section with 0.4 mm in thickness can be formed from SS-ECAP material.