Quartz-reinforced polyimide composite is a kind of material with anisotropic and nonuniform properties. The machinability has high dependence on fiber orientation θ. This paper presents the first comprehensive investigation on the cutting model of composites based on fiber orientation. A series of cryogenic cooling milling experiments were carried out to study the influence of fiber orientation on surface morphology, roughness, milling force, and tool wear. The results show that fiber orientation with acute angle has more advantages than obtuse angle. At the same time, it can provide effective chip breaking for latitude and longitude fibers at θ = 45° acute angle. Besides, when the tool is swept 96°, the milling force will reach the maximum, and the shearing effect of the latitude fiber is achieved maximum near θ = 60°. Similarly, the best surface quality is obtained where pits, crack, and burr defects are effectively restrained. Meanwhile, when the chosen cutting speeds are 50, 100, and 150 m/min, the roughness of 0.86 µm, 0.61 µm, 0.5 µm can be attained with θ = 48°, 55°, and 57°, respectively. Although the tool wear is relatively obvious when θ = 60°, the tool is still in a stable wear stage with better machining effect. Hence, it can be concluded that cryogenic cooling machining has better machinability and cutting effect at fiber orientation θ = 60° with larger milling parameters.

中文翻译：

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纤维取向对石英纤维复合材料低温冷却球磨性能的影响

石英增强聚酰亚胺复合材料是一种具有各向异性和不均匀特性的材料。可加工性高度依赖于纤维取向 θ。本文首次对基于纤维取向的复合材料切割模型进行了综合研究。进行了一系列低温冷却铣削实验，研究了纤维取向对表面形貌、粗糙度、铣削力和刀具磨损的影响。结果表明，锐角纤维取向比钝角纤维取向更具优势。同时可以为θ=45°锐角的经纬光纤提供有效的断屑。此外，当刀具后掠96°时，铣削力将达到最大，在θ=60°附近，纬向纤维的剪切作用达到最大。相似地，在有效抑制凹坑、裂纹和毛刺缺陷的情况下获得最佳表面质量。同时，当所选择的切削速度为50,100和150m / min时，分别达到0.86μm，0.61μm，0.5μm的粗糙度，分别可以分别达到θ= 48°，55°和57°。虽然θ=60°时刀具磨损比较明显，但刀具仍处于稳定磨损阶段，加工效果较好。因此，可以得出结论，在较大的铣削参数下，深冷加工在纤维取向θ=60°时具有更好的可加工性和切削效果。虽然θ=60°时刀具磨损比较明显，但刀具仍处于稳定磨损阶段，加工效果较好。因此，可以得出结论，在较大的铣削参数下，深冷加工在纤维取向θ=60°时具有更好的可加工性和切削效果。虽然θ=60°时刀具磨损比较明显，但刀具仍处于稳定磨损阶段，加工效果较好。因此，可以得出结论，在较大的铣削参数下，深冷加工在纤维取向θ=60°时具有更好的可加工性和切削效果。