高强度精密锻钢活塞锻造预锻模具设计及加工关键要点实践研究  

Practice research on key points of pre-forging die design and machining for high strength precision forged steel piston forging

作　　者：徐皓 刘江 XU Hao;LIU Jiang(School of Intelligent Manufacturing and Transportation,Chongqing Vocational Institute of Engineering,Chongqing 402246,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Chongqing Dongke Die Manufacturing Co.,Ltd.,Chongqing 401320,China)

机构地区：[1]重庆工程职业技术学院智能制造与交通学院,重庆402246 [2]重庆大学材料科学与工程学院,重庆400044 [3]重庆东科模具制造有限公司,重庆401320

出　　处：《塑性工程学报》2021年第11期50-55,共6页Journal of Plasticity Engineering

基　　金：重庆市教委项目(KJQN202003406,KJQN202103409,JG201002,Z211014)。

摘　　要：针对锻钢活塞结构形状复杂、拔模斜度小、尺寸精度要求高、薄裙部锻造成形困难、生产效率低、产品合格率低等难题,着重分析了锻钢活塞锻造特征、工艺及锻造模具设计、安装和加工的关键要点,包括模具材料选用及热处理要求、模具型腔内增设排气孔和顶杆孔、锻模飞边桥上设置环形阻力沟以及模具加工等。通过企业反复生产实践验证,总结提炼出6个设计及加工要点。在此基础上所制作出的活塞锻模不仅成本低廉、单次模具寿命高,而且锻钢活塞尺寸精度高、表面质量好,锻件合格率达到98.9%,单班产量达到800只以上。Aiming at the problems such as the complex shape,small draft angle,high requirement of dimension accuracy,difficulty of shaping thin skirt forging,low production efficiency and qualified rate of forged steel piston,the key points of forging characteristic and process of forged steel piston and forging die design,installation and processing were emphatically analyzed,including die material selection and heat treatment requirements,adding vent hole and ejector hole in die cavity,ring resistance groove arranged on flying-side bridge of forging die and die processing.Through the repeated production practice verification,six designing and processing points were summarized and extracted.The piston forging die produced on this basis has low cost and long single die life.Besides,the forged steel piston has high dimensional precision and good surface quality,and the qualified rate of forgings reaches 98.9%,and the single shift output reaches more than 800.

关 键 词：锻钢活塞 拔模斜度 模具设计 排气孔 阻力沟 

分 类 号：TG315.2[金属学及工艺—金属压力加工]