摘要
生产某壳体零件的凸模存在着严重的塑性变形早期失效现象,本文结合生产实际利用Deform有限元模拟软件对其温挤压过程进行了模拟。通过模拟得到模具在挤压过程中的温度场分布情况。取不同的挤压速度进行了对比分析,得到不同挤压速度时凸模前端高温层厚度。结果表明:当坯料温度低于700℃时,凸模因应力超过模具材料的屈服强度发生塑性变形而失效;挤压速度越小,凸模镦粗和局部磨损越严重;模具温度高于400℃时,其硬度会随着温度的升高而急剧降低,模具容易塑性变形。
For the die early failure because of plastic deformation,the warm extrusion process of a shell part was simulated using Deform finite element software.Temperature field distribution of mould was acquired.Heat zone thickness of the die front end was acquired with different extruding speeds.The results show that mould plastic deformation will happen because the punch stress exceeds the die material yield strength when blank temperature under 700 ℃.The smaller the extrusion speed,the more serious the punch upsetting and wear.When mould temperature is higher than 400 ℃,the plastic deformation will happen easily beacase of hardness sharply decreasing with temperature increasing.
出处
《锻压技术》
CAS
CSCD
北大核心
2011年第6期141-145,共5页
Forging & Stamping Technology
基金
院级青年基金资助项目(K-1010)
