环件冷辗扩中宽展的实验研究

根据D56G90型环件冷辗扩机的工作原理和实际工作情况，选取了影响矩形截面环件冷辗扩宽展的2种主要因素：进给速度和宽径比来设计研究宽展变化的实验方案。通过对实验结果的分析表明：进给速度和宽径比的增加都可以在一定程度上减小环件的宽展，使环件端面平整。同时，也发现了环件内外侧的宽展率不相同。这些现象的本质是环件冷辗扩过程中的径向和轴向塑性区的分布不同。使用MATLAB编写了数值计算程序，采用二项式拟合的数值方法，总结归纳出了进给速度和宽径比与宽展率之间的解析公式。

The Experiment Research of Width Spread in Cold Ring Rolling

According to the operating principle and actual work condition of D56G90 cold ring rolling mill,two major factors,feed speed and width-radius ratio,that affected the width spread in cold rolling rectangle cross-section ring were selected to design width-spread experiment.The experiment results showed that when feed speed was increased,width-radius ratio can reduce the width spread ratio and flat the side surfaces of ring in some extend.At the same time,it can find that the outside and inside width spread was different.The nature reason of these phenomena was that the radial and axial plastic zone distributions were different in cold ring rolling.Using the binomial fitting method in MATLAB to program numerical calculation program,the analytical formulations between feed speed,width-radius ratio and width spread ratio were deduced.