摘要
SiC增强铝基复合材料切削时的切屑形貌和变形系数是确定切削变形程度的重要手段,是计算其它切削过程参数的来源。通过采用硬质合金和聚晶金刚石PCD刀具车削SiC增强铝基复合材料,观察切屑形貌的SEM图片,检测切屑变形尺寸,计算切屑变形系数。结果表明,正常切削条件下切屑形态为节状锯齿形,且锯齿顶角约为45°;切削速度对变形系数的影响曲线呈驼峰型,即在积屑瘤生长阶段,增大切削速度会减小变形系数,而在积屑瘤消退阶段,增大切削速度会增大变形系数;随着进给量和刀具前角的增加,变形系数都会相应地减小。
The chip compress ratio and feature are an important method for researching on the deformation of chips and the source to calculate other parameters in the cutting process of SiC reinforced aluminum composites. The SEM photos, the deformation dimensions and the compress ratio of chips were observed, measured and calculated in cutting SiC reinforced aluminum composites by carbide and PCD tools, respectively. The experimental results show that the feature of the chip is the serrate appearance and the angle of sawtooth tip is about 45° in the experimental condition; Moreover, the curve between cutting speed and chip compress ratio is hump. With increasing the cutting speed, the chip compress ratio is reduced in the period of built-up edge that it is produced-increased. But, with increasing the cutting speed, the chip compress ratio is increased in the period of built-up edge that it is augmented-broken off. With increasing the feed ratio and the rake angle of tool, the chip compress ratio will be reduced.
出处
《组合机床与自动化加工技术》
北大核心
2009年第11期13-16,共4页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家863高新技术研究项目(2006AA050203)
福建省自然科学基金计划资助项目(E0640012)
