八挡自动变速器主壳体压铸工艺优化  

Optimization of the Die Casting Process for Main Case of Eight-SpeedAutomatic Transmission

作　　者：柯春松[1] 唐杰 庄舰[1] 刘红娟[1] KE Chun-song;TANG Jie;ZHUANG Jian;LIU Hong-juan(Ningbo Polytechnic,Ningbo 315800,Zhejiang,China;IKD Co.,Ltd.,Ningbo 315800.Zhejiang,China)

机构地区：[1]宁波职业技术学院,浙江宁波315800 [2]爱柯迪股份有限公司,浙江宁波315800

出　　处：《铸造》2022年第8期997-1004,共8页Foundry

摘　　要：针对国内自主研发的八挡自动变速器主壳体,通过数值模拟仿真分析,优化了浇排系统和压铸工艺,缩短了模具开发周期,提高了模具设计成功率。采用局部挤压技术,对产品中的高压油道、“U”形凹槽等关键区域进行挤压补缩,增加了铸件该部位的致密度,消除了缩松、缩孔缺陷,避免了铸件在压力下泄露问题。通过真空压铸技术,解决了大型复杂铸件不易成形的技术难点,减少了铸件气孔缺陷的产生,铸件气密性符合技术要求。通过试模,铸件各项性能指标均达到客户要求。最终,产品顺利实现量产,合格率达到90%以上。The gating system and overflow system and die casting process were optimized through numerical simulation analysis for the main case of eight-speed automatic transmission, which was developed independently in China, the mold development cycle is shortened and the success rate of mold design has been improved. Using local pressurization technology, the key areas such as high-pressure oil passage and “U” shaped groove in the product are squeezed and fed, so that the density of this part of casting is increased, the defects of shrinkage and dispersed shrinkage are eliminated, and the leakage problem of casting under pressure is avoided. Using vacuum die casting technology, the technical difficulties of hard forming of large and complex castings are solved, and the porosity defects of castings is reduced, the air tightness of casting meets the technical requirements. Through mold testing, all the casting performance indexes meet customer requirements. Finally,the product was successfully mass produced, and the qualified rate reached more than 90%.

关 键 词：变速器 数值模拟 局部挤压 真空压铸 

分 类 号：TG249.2[金属学及工艺—铸造]