管端精密快速成形模具仿真设计  

Simulation design of rapid precision forming die for pipe end

作　　者：李晓广[1] 许石民[1] 孙登月[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《锻压技术》2016年第1期101-105,115,共6页Forging & Stamping Technology

基　　金：河北省自然科学基金资助项目(E2012203008)

摘　　要：传统的发动机水管加工方法是采用车床加工,产品精度低,表面质量差,并且生产效率低下。圆柱管在轴向载荷的作用下能发生对称的局部屈曲变形。利用这一原理,通过模具对钢管进行冷加工成形为所需的喇叭状管口。但是钢管脱模后,在残余应力的作用下会发生弹性恢复,使得所需的尺寸发生变化影响成形精度。另一方面,成形过程中作用在模具上的摩擦力影响模具寿命,需给模具选择合适的公差。基于以上两种因素,得到了合适的上模深度p=3.60 mm,并给模具尺寸确定了合适的上下偏差。据此加工模具并利用该模具成形出了所需形状和精度的钢管。A traditional way of manufacturing water pipe in the engine by the lathe is of low precision, poor surface quality and low pro- ductivity. The cylindrical pipe occurs local symmetric buckling under axial load. Based on this principle, the pipe end was formed into the desired flared nozzle by the die. However, when the pipe was released from the die, springback oeeured to change the formed sizes and affected the forming accuracy due to the residual stress. Moreover, the die life was shortened by frictions in the forming process, and the manufacturing tolerances of the die was suggested to choose suitably. Considering the above two factors, the suitable depth of the upper die was 3.60 mm, and the appropriate upper and lower deviation of the die size was determined at the same time. In result, the die is manufactured, and the pipe end is formed as the required shape and qualified precision.

关 键 词：冷成形 模具 管端 仿真 

分 类 号：TG76[金属学及工艺—刀具与模具]