ALUMINUM ALLOY FOR CASTING AND FORGING, CASTING AND FORGED PRODUCT FOR CHASSIS STRUCTURE AND METHOD FOR MANUFACTURING THE SAME

The present invention provides an aluminum alloy comprising: 96.28-97.22 wt% of aluminum (Al); 0.7-1.3 wt% of silicon (Si); 0.7-0.8 wt% of magnesium (Mg); 0.7-0.8 wt% of zinc (Zn); 0.07-0.1 wt% of manganese (Mn); 0.25-0.3 wt% of copper (Cu); 0.08-0.1 wt% of chrome (Cr); 0.1-0.13 wt% of titanium (Ti); 0.1-0.13 wt% of zirconium (Zr); and 0.07-0.1 wt% of iron (Fe). A component manufactured by the aluminum alloy for casting and forging and a method to manufacture a vehicle chassis structure component using the same is able to perform prevention of casting hot rolling crack, prevention of an inner contraction defect, and controlling of crystal grain size of 150 or less. More specifically, the real shape component casting is able to reduce production costs by 10% by product recovery ratio of products and simplifying a manufacturing process by being able to reduce continuous casting billet, homogenization treatment, and cutting which are alloy manufacturing processes of a prior 6000 series hot forging. As such, if the high strength aluminum alloy for real shape casting and forging is applied to the component for the vehicle chassis structure, excellent mechanical characteristics is obtained to reduce design weight, and the effects of cost reduction can be provided by a simple manufacturing process when compared to a prior hot forging process. 본 발명은, 알루미늄(Al) 96.28 ~ 97.22중량%, 실리콘(Si) 0.7 ~ 1.3중량%, 마그네슘(Mg) 0.7 ~ 0.8중량%, 아연(Zn) 0.7 ~ 0.8중량%, 망간(Mn) 0.07 ~ 0.1중량%, 구리(Cu) 0.25 ~ 0.3중량%, 크롬(Cr) 0.08 ~ 0.1중량%, 티타늄(Ti) 0.1 ~ 0.13중량%, 지르코늄(Zr) 0.1 ~ 0.13중량%, 철(Fe) 0.07 ~ 0.1중량% 로 구성된 주단조용 알루미늄 합금을 제공한다. 이와 같은, 주단조용 알루미늄 합금 및 이를 이용한 자동차 샤시구조 부품의 제조방법으로 제조된 부품은, 주조열간크랙방지, 내부수축결함방지 및 결정립사이즈 150 이하로 제어 할 수 있으며, 특히, 실형상으로 부품 주조는 기존의 6000계열 열간단조용 합금 제조공정인 연속주조빌렛, 균질화처리, 절단등의 공정을 절감할 수 있어 제품의 회수율 및 제조공정 단순화로 제조원가 10% 절감을 할 수 있다. 이에 자동차 샤시구조용 부품에 실형상 주단조용 고강도 알루미늄합금을 적용하면 기계적특성이 우수하여 설계중량을 절감할 수 있으며, 기존의 열간단조공정 대비 단순 제조공정으로 원가절감 등의 효과를 제공한다.