大型薄壁铝合金减震塔砂型铸造技术研究  

Study on Large Thin-Wall Aluminum Alloy Damping Tower Sand Casting Technology

作　　者：阮明[1] 刘海峰 姚红[3] 石飞[1] 冯志军[1] 李宇飞[1] 

机构地区：[1]沈阳铸造研究所高端装备轻合金铸造技术国家重点实验室,辽宁沈阳110022 [2]一汽铸造有限公司,吉林长春130062 [3]陆军沈阳军代局驻沈阳地区军代室,辽宁沈阳110043

出　　处：《铸造》2017年第4期327-331,336,共6页Foundry

摘　　要：针对减震塔铸件结构特点,分析了减震塔铸造工艺难点及要点,开展了A357合金成分控制、合金熔体净化、合金晶粒组织细化、薄壁件完整充型、尺寸精度控制及内部质量控制研究。研究结果表明:通过合金成分控制,合金熔体净化、合金变质及晶粒组织细化,获得本体各向同性、力学性能优异的A357铝合金减震塔铸件;铸件采用精密砂型调压铸造方法,优化浇注系统,在筋条交接厚壁处进行激冷的铸造工艺,高过热度浇注,并结合保温涂料及增强砂型排气,获得充型完整、内部质量优良的减震塔铸件,达到设计要求;另外,通过减震塔分模设计及优化,整体外型及内芯分型面阶梯齿状配合,定位销与定位套镶嵌固定的方式,并结合热处理防变形工装,使铸件尺寸满足设计要求。Based on the characteristics of damping tower structure, the damping tower casting process key points were analyzed. By A357 alloy composition, size and quality control, melt purification and grain refinement, the thin-wall casting filling full, the isotropy and excellent mechanical property A357 alloy damping tower casting was gained. The foundry by using of precision sand adjusted pressure casting method, optimized gating system, and chill in rod handover thick wall area, high degree of super-heat pouring, while combined with thermal insulation coatings and reinforced sand mold venting, the filling full, fine internal quality of damping tower casting was obtained, meet the design requirements. In addition, through die design and optimization, overall outside sand mold and inner core parting surface cooperate with ladder dentate, positioning pin and locating sleeve inlays fixed way, and combined with heat treatment tooling and deformation control, the size of casting meet the design requirements.

关 键 词：A357合金 大型薄壁 铝合金减震塔 砂型调压铸造 

分 类 号：TG292[金属学及工艺—铸造]