基于数值模拟的摩托车T型活塞成形缺陷分析  

Analysis on the extrusion-defect of T-style motorcycle piston based on numerical simulation

作　　者：宋志真[1,2] 杨永顺[1,2] 党利[1,2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室

出　　处：《矿山机械》2009年第6期80-83,共4页Mining & Processing Equipment

摘　　要：对活塞顶部挤压折叠缺陷产生的原因进行了分析,发现折叠缺陷是由于余料太薄引起的缩尾性折叠;分别对增厚坯料法、方形坯料法和两步挤压法进行了分析比较,结果表明采用增加坯料厚度的方法来防止折叠不仅增加了材料的浪费,也会增大后续的机加工量,是不经济的;方形坯料虽说可以有效的避免活塞顶部金属对流情况,但是会在活塞环岸内侧产生折叠;而两步挤压法有效的防止了活塞销顶部金属对流的情况,有效的避免了活塞顶表面折叠的产生。The cause of extrusion enfold-deject at the top of piston is analyzed, which is because of the thin remainder. The three methods of increasing stock, squareness-stock and the backward and forward combined extrusion are analyzed and compared. The results show that the increasing stock method not only wastes the material, but also increases subsequent machine-work, so it is not economical, and the squareness-stock method can avoid the metal convection at the top of piston but cause enfold-defect in the inner side of piston-land, while the backward and forward combined extrusion method can prevent the metal convection at the top of piston pin hole and avoid the enfold-defect on the surface of the piston-crown efficiently.

关 键 词：挤压 活塞 折叠缺陷 数值模拟 

分 类 号：TG376[金属学及工艺—金属压力加工]