论文部分内容阅读
采用数值模拟软件JSCAST对精密车削加工中心HTC2050和精密卧式加工中心HMC50e灰铸铁床身铸件的充型、凝固过程、温度场、应力及变形进行模拟分析;采用盲孔法测量不同打箱温度下的灰铸铁床身铸件和粗加工前后的球铁滑枕箱体铸件的残余应力。结果表明:铸件下箱床身凝固慢,导致床身容易产生残余应力,且横导轨的应力比竖导轨大;导轨及节点处有缩松缺陷,易引起收缩应力;床身在长度方向的变形量比宽度和高度方向的变形量大;灰铸铁件的残余应力比球墨铸铁件大,较低的打箱温度有利于减小残余应力,粗加工后残余应力明显增大。
The numerical simulation software JSCAST was used to simulate the filling, solidification process, temperature field, stress and deformation of the precision turning center HTC2050 and the precision horizontal machining center HMC50e gray cast iron bed castings. The blind hole method was used to measure the filling temperature, Of the gray cast iron bed castings and rough before and after the ductile iron ram box castings residual stress. The results show that the bed body of castings is slow solidified, which leads to the residual stress easily generated in the bed, and the stress of transverse guide rail is larger than that of the vertical guide rail. The shrinkage defects at the guide rail and the node can easily cause shrinkage stress. The deformation of the bed in the length direction The amount of deformation is greater than the width and height direction; the residual stress of gray cast iron pieces is larger than that of ductile iron, the lower boxing temperature is conducive to reducing the residual stress, and the residual stress increases obviously after roughing.