摘要
机载雷达屏蔽器是某机载雷达电子系统关键零件,几何形状大而复杂,性能指标要求高、成形难度大。采用等温挤压工艺,成形温度为380℃。根据等温压缩实验所得变形镁合金应力-应变数据,应用刚塑性有限元法模拟变形镁合金等温挤压成形,探讨变形镁合金等温挤压成形过程中变形力及金属流动规律。根据模拟得到的应力场、应变场、速度场及加载变化等,预测变形时产生的缺陷。在试验生产中借鉴模拟结果,成功地挤压出镁合金零件,其力学性能,组织和尺寸精度均符合产品要求,为大型板片类零件成形技术奠定了坚实的理论和实践基础。
The airborne radar shielding slab is a key part of a certain space flight electronic system, it has complicated geometry shape, large size, high requirements in performance index, so forming difficulty is very great. Adopting the isothermal extrusion process, the extruding temperature was 380 ℃. Based on stress-strain data from isothermal compression experiment, the isothermal extrusion deformation of the wrought magnesium alloy was simulated adopting rigid-plastic finite element method, the deformation force and metal flow law in the course of isothermal extrusion deformation of wrought magnesium alloy were discussed. According to the simulation result about stress field, strain field, velocity field and load change and so on, the defect in the course of deformation was forecasted. Based on the simulation results, the magnesium alloy part was extruded successfully in test production. Its mechanical properties, microstructure and size precision can meet product requirement. It offers the reliable reference for similar isothermal extrusion deformation parts.
出处
《热加工工艺》
CSCD
北大核心
2008年第17期80-83,共4页
Hot Working Technology
关键词
等温变形
数值模拟
镁合金
isothermal deformation
numerical simulation
magnesium alloy
