芳纶纤维材料低温冷却车削加工性能

芳纶纤维复合材料在传统车削加工中易出现严重起毛和高温烧蚀等缺陷。为了提高其切削性能,采用液氮作为低温冷却媒介进行车削加工试验,并对材料的干车削及低温车削试验结果进行了分析,对液氮低温车削机理进行了探讨。结果表明,随着主轴转速的增加,材料表面质量得到一定改善,特别是在1 340r/min时得到了最佳表面;在低温车削中,在各种转速条件下,材料表面质量都较好;在相同的主轴转速下,低温车削表面质量都好于干车削,且纤维起毛、高温烧蚀被有效抑制。说明降低切削温度对芳纶纤维材料车削缺陷的改善有积极作用。

Performance of Liquid Nitrogen Cooling Turning Test of Aramid Fiber Composite

Aramid fiber-reinforced polymer was easy to occur defects such as ablation and burr in traditional turning process.The method of liquid nitrogen cooling turning process was carried out to reduce the defects of fluff and high temperature ablation of aramid fiber material and improve the cutting performance and machining quality.The experimental results of dry turning and liquid nitrogen cooling turning of materials were analyzed,and the mechanism of liquid nitrogen low temperature turning was discussed.The results show that with the increase of spindle speed,the fiber surface quality is improved.Especially at 1 340 r/min,the optimum surface is obtained.In liquid nitrogen cooling turning process with different speeds,surface qualitis are better.At the same spindle speed,the surface quality of liquid nitrogen cooling turning is better than that of dry turning.Therefore,the decreasing cutting temperature has played a positive role for the improvement of the aramid fiber cutting defects.