【摘要】 采用自主研发的高真空压铸控制系统,以某铝合金轿车底盘部件为对象,研究了高真空压铸工艺参数如真空度、抽真空时间、压射速度及高速切换点等对铸件内部质量及力学性能的影响。试验结果表明:该铝合金轿车底盘关键部件的最佳高真空压铸工艺参数:抽真空启动位置110 mm,抽真空停止位置700 mm;冲头慢压射速度0.19 m/s,快压射速度5.8 m/s;慢/快速转换点即高速切换点240 mm;型腔真空度91 kPa以上。高真空压铸的底盘部件本体试样抗拉强度达到281.56 MPa、屈服强度达到155.44 MPa、伸长率达到7.34%,完全满足该铸件的技术要求。经过严格的产品检测,该铝合金轿车底盘部件已成功用于某国产自主品牌轿车。更多还原

【Abstract】 Based on innovative high vacuum control system,effects of shot parameters including vacuum level,venting time,shot velocity and switch position of fast velocity on casting quality and mechanical properties were investigated for the high vacuum die-cast car chassis part in this paper.The results show that optimal process parameters are as follows:the vacuumed startup and stop position are 110 mm and 700 mm respectively,and the vacuum level of cavity is up to 91 kPa;meanwhile the slow and fast velocity of the injection punch are 0.19 and 5.8 m/s,and switch position of fast velocity is 240 mm.The round car chassis part can be achieved under above parameters,whose tensile strength is 281.56 MPa,yield strength 155.44 MPa and elongation up to 7.34%.The chassis part was successfully employed in a domestic own-brand car.更多还原