高密度芳纶纸蜂窝的磨削试验

Experiment on grinding performance of high-density aramid honeycombs

高密度芳纶纸蜂窝是航空航天领域常用的减重复合材料,由韧性较大的芳纶纤维和含量较高的脆性树脂固化而成,固化成型后很难加工。为了满足其加工需求,根据该材料的组成成分和结构特点,用金刚石砂轮进行高密度蜂窝的磨削加工工艺试验,归纳出其在磨削加工后出现的3种典型加工特征形貌,即双层芳纶纸变宽形貌、未分离切屑和纤维拔出;并通过单因素试验法,研究磨削速度、进给速度和磨削深度对其表面形貌的影响。试验结果表明:不同工艺参数对高密度蜂窝加工形貌的影响差异较大。当磨削速度由5.2m/s提高至20.9m/s时,3种特征形貌均得到改善;当进给速度从50mm/min提升为350mm/min时,纤维拔出数量增多;当磨削深度从0.1mm增加为0.9mm时,未分离切屑的平均宽度变大。

High-density aramid paper honeycomb consists of high toughness aramid fibers and a high-content of brittle resin,and it is commonly used in the aerospace industry as weight-reducing composite material.High-density honeycomb is difficult to process after molding.In order to meet the processing requirements of material after forming,according to the composition and structural characteristics of the material,we carried out grinding process experiments on high density honeycombs with diamond grinding wheels,and summarized that there are three typical processing features of high density honeycombs after the grinding process,namely the double-layer honeycomb paper widening topography,the unseparated chip topography and the fiber pull-out morphology.The influences of grinding speed,feed speed and cutting depth on surface morphology were studied by single factor test method.The results show that different process parameters have different effects on the morphology of high density honeycomb.When the grinding speed is increased from 5.2 m/s to 20.9 m/s,the three characteristic morphologies are improved.When the feed speed is increased from 50 mm/min to 350 mm/min,the number of fibers pull-out increase,and when the cutting depth is increased from 0.1 mm to 0.9 mm,the width of the unseparated chips become large.