摘要
对近α高温钛合金BTi-6431S铣削加工切屑的三维微观形貌进行了研究。分析了切屑自由面、背面、侧面和顶面的形貌及组织结构的特征。结果表明,切屑的自由面主要由主截面和角截面组成,主截面是由底切削刃形成,角截面是由角切削刃和侧切削刃形成,主截面褶状结构的频率远大于角截面,而角截面的褶皱程度更大。在切屑背面可以观察到角切屑刃和底切削刃形成的交线。切屑的顶面呈现出明显的锯齿状,且切屑的锯齿化程度随着进给量的增加而增加,使锯齿形切屑向单元切屑转变。在低的进给量下,剪切带内的α相和β相结构被拉长,沿剪切方向取向,随着进给量的增加,剪切带中的β相转变为α相。
The 3D chip morphology of near α high temperature titanium alloy BTi-6431S in milling machining is researched.The characteristics of free surface,back surface,cross surface and top surface of chips are analyzed. The results show that the free surface is mostly consisted of main section and corner section. The main section is formed by the end edge,and the corner section is formed by the corner edge of the tool in the milling process. The frequency of lamella structure on the main section is larger than that on the corner section,while the size of lamella structure on the corner section is large. On the back surface,the intersection line of end edge and corner edge can be seen apparently. The saw-tooth structures exist on the top surface,and the extent of saw-toothed is increasing with the increase of feed rate. As a result,the saw-tooth chips transform to discontinuous chips eventually. Under low feed rate,the structure of α and β phase on the shear band are enlarged in the direction of cutting shear. However,with the increase of feed rate,the β phase on the shear band transform to α phase.
出处
《机械设计与制造》
北大核心
2016年第1期126-129,共4页
Machinery Design & Manufacture
