3D打印ABS材料表面长方形织构的摩擦学性能

Tribological Properties of Rectangular Texture on Surface of 3D Printed ABS Material

为了研究丙烯腈-丁二烯-苯乙烯塑料(ABS)材料表面及织构的摩擦学性能,以线宽1.75 mm的ABS线材为基材,基于UM架构3D打印机,利用熔融沉积成型(FDM)技术制备光滑无织构ABS试样和表面具有长方形微凹坑织构的织构化ABS试样。对长方形织构表面和无织构光滑表面进行了模拟分析,采用多功能摩擦磨损试验机对织构化试样进行了富油摩擦试验,利用体式显微镜观察表面织构磨痕形貌,探究不同载荷(5,10,20 N)及不同转速(100,200,300 r/min)对织构化试样摩擦学性能的影响。有限元分析软件COMSOL分析表明,凹坑的存在使得油液内部产生空化现象,产生流体动压润滑效应,长方形织构使得其表面承载力比无织构提升了约2.54倍。摩擦试验结果证明,在不同载荷下,3种转速对织构化试样的摩擦系数影响趋势各不相同;在较低转速下,载荷较低的织构化试样摩擦系数较小,而在高转速下,采用适中的载荷可获得较低的摩擦系数。当转速为300 r/min、载荷为10 N时,织构化试样具有较好的减摩抗磨性能,平均摩擦系数低至0.022。与光滑无织构试样相比,织构化ABS试样具有较好的减摩抗磨效果。

In order to study the tribological properties of the surface and texture of acrylonitrile-butadiene-styrene plastic(ABS)materials,taking ABS filament with line width of 1.75 mm as the base material and using a 3D printer based on the UM ar‐chitecture,the smooth non-textured ABS samples and the textured ABS samples with rectangular micro-concave texture were pre‐pared by fused deposition molding(FDM)technology.The rectangular textured surface and smooth non-textured surface were simu‐lated and analyzed.The oil-rich friction tests of the textured samples were carried out on multi-functional friction and wear testing machine,the wear scar morphology of surface texture was observed by stereo microscope,and the effects of different loads(5,10,20 N),different rotational speeds(100,200,300 r/min)on the tribological properties of the textured samples were explored.The fi‐nite element analysis software COMSOL analysis shows that the existence of the concaves causes cavitation in the oil,resulting in a hydrodynamic lubrication effect,and the bearing capacity of the surface of the rectangular texture increases by about 2.54 times compared with non-textured.The friction experimental results show that under different loads,the influences of the three rotational speeds on the friction coefficient of the textured samples are different.At low rotational speed,the friction coefficient of the textured samples wth low load is lower,while at high rotational speed,the lower friction coefficient can be improved with moderate load.The anti-friction and anti-wear properties of the textured ABS sample are better when the load is 10 N and the rotational speed is 300 r/min,the average friction coefficient is as low as 0.022.Compared with the smooth non-textured ABS sample,the textured ABS sample has better anti-friction and anti-wear effects.