Nomex蜂窝芯直刃尖刀超声切割表面微观形貌特征

发布时间：2018-03-28 20:34

本文选题：超声辅助切割　切入点：Nomex蜂窝芯　出处：《机械工程学报》2017年19期

【摘要】：Nomex蜂窝芯是典型的难加工材料,具有高比强度,比刚度及各向异性的特点。超声辅助切割是蜂窝芯复合材料的一种高效加工方法,可以得到比高速铣削更好的加工质量。但是在超声切割加工过程中依然会存在不同程度的纤维拔出,酚醛清漆层剥落等加工缺陷特征。为了研究其微观形貌特征,采用纵切,斜切,横切三种方式切割蜂窝芯,并对蜂窝芯的加工形貌进行观测。根据微观形貌在蜂窝芯壁上的位置,分别归纳为酚醛清漆层、热压芳纶纸层和蜂窝壁的形貌。研究超声刀具加工参数对材料破损形貌特征的影响。结果表明在10μm到30μm范围内提高超声刀具振幅,在500 mm/min到3 500 mm/min范围内降低进给时会降低蜂窝芯加工过程中的酚醛清漆层剥落的几率。
[Abstract]:Nomex honeycomb core is a typical refractory material with high specific strength, specific stiffness and anisotropy. Ultrasonic assisted cutting is an efficient processing method for honeycomb core composites. Better machining quality can be obtained than high speed milling. However, there are still some defects in ultrasonic cutting, such as fiber drawing, peeling off of phenolic varnish layer, etc. In order to study its microscopic morphology, longitudinal cutting is used. The beehive core was cut by oblique cutting and crosscutting, and the morphology of honeycomb core was observed. According to the position of micro-morphology on the wall of honeycomb core, it was divided into phenolic varnish layer, The morphology of hot-pressed aramid paper layer and honeycomb wall. The influence of machining parameters of ultrasonic cutting tools on the damage morphology of materials is studied. The results show that the amplitude of ultrasonic cutting tools is increased in the range of 10 渭 m to 30 渭 m. When the feed is reduced in the range of 500 mm/min to 3 500 mm/min, the probability of peeling off the phenolic varnish layer during the processing of honeycomb core is reduced.
【作者单位】：大连理工大学精密与特种加工教育部重点实验室;
【基金】：国家高技术研究发展计划(863计划,2015AA043402) 国家自然科学基金(51575085) 国家商用飞机制造工程技术研究中心创新基金(201500308)资助项目
【分类号】：TB33;TG48

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