FORMING PRINCIPLE OF TWO SIDE-DIRECTION BURR AND IT'S PREDICTION IN METAL CUTTING

The burr is one of the common phenomena occurring i n metal cutting operations The mathematical mechanical model of two side dir ection burr formation and transformation is established with plane stress strain theory,based on the orthogonal cutting The main laws of formation and change of the burr are revealed,and it is confirmed by experiment result,which first realizes prediction of the forming and changing of the two side direction burr in metal cutting operation.

两侧方向毛刺形成的数学模型

毛刺是影响金属切削加工质量的主要因素之一。本研究以直角自由切削实验为基础 ,建立了两侧方向毛刺形成的数学 -力学模型 ,系统地揭示出两侧方向毛刺形成与切屑剪切应变的关系 ,给出了两侧方向毛刺形态转换的界限条件。并提出了被切削层金属沿刀具切削刃向工件两侧的自由表面产生塑性流动是形成两侧方向毛刺主要原因的新观点 ,得到了试验结果的证实。本文实现了金属切削中两侧方向毛刺形成与变化的预报 ,在精密与超精密加工和自动化加工中有广阔的应用前景。