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石英纤维增强聚酰亚胺复合材料超低温铣削实验
侯博1,谢浔1,崔超1,刘春先1,王保林1
航天材料及工艺研究所,北京 100076
摘要:
石英纤维增强聚酰亚胺复合材料是一种非均匀的各向异性材料,采用传统铣削方法对其进行加工时存在刀具磨损严重、切削力较大、加工效率低等问题。为此本文采用超低温冷却铣削方法对石英纤维增强聚酰亚胺复合材料进行铣削实验,并与传统干铣削方式进行了对比,分析了包括加工表面形貌、粗糙度、切削力和刀具磨损等切削性能。结果表明:两种工况下,表面粗糙度随主轴转速的提高而降低,随切深的增加呈先降低后增大趋势;相对于干铣削,不同切削速度下超低温冷却铣削有效抑制了低速干铣削纤维起毛、高速干铣削黏结剂烧蚀缺陷,表面质量都得到改善,刀具耐用度得到提高。超低温冷却引起的复合材料切削力增大,纤维断屑方式的改变以及切削热的有效降低是提高加工质量的主要原因。
关键词:  石英纤维增强聚酰亚胺复合材料  低温冷却  加工质量
DOI:10.12044/j.issn.1007-2330.2020.03.010
分类号:TG506.3
基金项目:
Milling Properties of SiO2 Fiber Reinforced Polyimide Composite Base on Cryogenic Cooling
HOU Bo1, XIE Xun1, CUI Chao1, LIU Chunxian1, WANG Baolin1
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
Because SiO2 fiber reinforced polyimide composites are heterogeneous anisotropic materials,there are many serious issues in the traditional milling process,such as severe tool wear,large cutting force and low processing efficiency.In this paper,SiO2 fiber reinforced polyimide composites are processed by cryogenic cooling milling.And the comparison between cryogenic cooling milling and traditional milling is also carried out.In addition,the machined surface morphology,roughness,cutting force and tool wear were analyzed.The results show that,the surface roughness decreases with the increase of spindle speed and decreases first and then increases with the increase of cutting depth under the two working conditions.Compared with traditional milling,cryogenic cooling milling at different cutting speeds can effectively inhibit the fiber fuzzing phenomenon during traditional milling with low-speed and the ablation defects of adhesives during conventional milling with high-speed. The main reasons for improving machining quality are the increase of cutting force,the change of fiber chip breaking mode and the decrease of cutting heat caused by ultra-low temperature cooling.
Key words:  SiO2 fiber reinforced polyimide composite  Cryogenic cooling  Machining quality