芳纶纤维复合材料超低温铣削试验研究

发布时间：2018-01-05 11:15

本文关键词：芳纶纤维复合材料超低温铣削试验研究　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：芳纶纤维复合材料具有重量轻、比强度大、良好的抗冲击性和电磁特性等性能,在航空航天、装甲防护和武器装备等领域中得到广泛应用。复合材料成型后,为满足使用要求和装配连接等尺寸精度,机械加工一般是复合材料构件制造的最后环节。然而维复合材料自身各向异性及不均匀性、高韧性等特点,传统机械加工过程中极易产生加工缺陷,致使复合材料成为典型的难加工材料。芳纶纤维复合材料高质量低损伤加工技术是成为研究热点本文分析芳纶纤维复合材料加工机理和加工缺陷成因,以芳纶纤维复合材料低温性质为基础,提出以液氮介质冷却方式对其进行铣削研究,搭建了低温铣削实验平台,在此基础上,利用金刚石刀具对芳纶纤维复合材料开展了铣削力和铣削质量等加工试验。本文内容包括：(1)根据芳纶纤维复合材料机械加工中存在的缺陷,揭示了加工过程中切削热对其材料性能的影响,通过研究芳纶纤维复合材料不同温度下纤维和树脂基体的性能,测量和观察液氮介质冷却条件下切削温度和纤维断裂形态,分析了芳纶纤维复合材料低温切削机理。(2)根据芳纶纤维复合材料加工实验要求,搭建了低温铣削加工平台,设计了液氮低温控制管路和内喷式刀柄结构,针对不同加工要求分别设计了外喷和内喷系统,标定了液氮流量和不同靶距下射流温度,建立了满足加工要求的低温加工系统。(3)开展芳纶纤维复合材料低温铣削力试验,通过单因素分析法对比了液氮冷却和无冷却条件下切削力变化规律,试验验证了低温切削可以有效降低铣削力,对低温铣削加工工艺进行了初步研究和优化。(4)通过对比不同冷却条件下芳纶纤维复合材料铣削质量试验,验证了液氮冷却低温加工可有效提高加工质量,分析了不同冷却温度下加工表面微观形貌,研究了冷却温度和加工参数对加工质量的影响。液氮介质冷却有效地提高了芳纶纤维复合材料加工质量,抑制了其加工缺陷,为该材料高质量低损伤加工提供了一种可行的方法。
[Abstract]:Aramid fiber composite material has the advantages of light weight, high strength, good impact resistance and electromagnetic properties, widely used in aerospace, weapon and armor protection field. Composite molding, to satisfy the operation requirements and assembly size accuracy, mechanical processing is generally the last link compound the material component manufacturing. However its composite material anisotropy and inhomogeneity, high toughness characteristics, easy to produce processing defects of traditional machining process, the composite material has become a typical difficult to machine materials. The aramid fiber composites with high quality and low damage processing technology is become analysis of the machining mechanism of aramid fiber composites this paper research and processing defects, the low temperature properties of aramid fiber reinforced composites based on their research put forward for milling cooling liquid nitrogen, to build a low The milling temperature experiment platform, based on this, the use of diamond tools to carry out the milling force and milling quality and processing test of aramid fiber composite materials. The contents of this paper include: (1) according to the defects of machining aramid fiber composites, reveals the influence of cutting heat in the process of its material properties, through study on the properties of aramid fiber reinforced composites under different temperature of fiber and resin matrix, measurement and observation of liquid nitrogen cooling conditions, cutting temperature and fiber fracture morphology analysis, low temperature cutting mechanism of aramid fiber composites. (2) according to the requirements of aramid fiber composite material processing experiment, build up cryogenic milling platform design low temperature of liquid nitrogen control pipeline and spray type tool structure, according to different processing requirements are designed to spray and spray system, the calibration of liquid nitrogen flow and different target distance under the jet temperature, Low temperature processing system is built to meet the processing requirements. (3) of aramid fiber composite low temperature milling tests, through single factor method comparative analysis of liquid nitrogen cooling and cutting force without cooling condition changes, test temperature cutting can effectively reduce the milling force, the preliminary research and optimization of low temperature milling process. (4) the aramid fiber composite material milling quality tests under different cooling conditions, verify the liquid nitrogen cooling low-temperature processing can effectively improve the processing quality, analysis of surface micro morphology under different cooling temperature, effects of cooling temperature and machining parameters on machining quality. Liquid nitrogen cooling can effectively improve the aramid fiber composite material processing quality, inhibiting its processing defects, provides a feasible method for the materials with high quality and low damage processing.

【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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