激光加工表面微织构对陶瓷刀具摩擦磨损性能的影响

目的优选陶瓷刀具表面微织构形貌,以获得减摩性能较好的微织构。方法采用摩擦磨损实验,单因素研究微织构对陶瓷刀具摩擦磨损性能的影响。测定不同形貌织构刀具的表面摩擦系数,对比其表面磨损形貌,并通过有限元分析软件ABAQUS对微织构表面摩擦过程进行有限元仿真分析,研究不同织构对刀具应力分布的影响。结果在载荷90 N、转速300 r/min、时间30 min的条件下进行摩擦磨损实验,无织构刀具表面摩擦系数约为0.42;放射状微织构刀具的微织构方向与对磨副运动方向垂直,其摩擦系数最低,约为0.35。有限元仿真分析表明,无织构刀具应力集中出现在对磨副与刀具接触的前沿,约16.68~18.19 MPa,应力集中容易引起局部磨损;微织构方向与速度方向垂直时,等效应力值约为21.96~31.37 MPa,应力分布更为均匀,应力较大值分布在微织构沟槽的两侧,刀具更耐磨。结论相比于无织构刀具,加工微织构会使得刀具表面摩擦系数降低,耐磨损性能提高,应力分布更为均匀。

Influence of Surface Micro Texture with Laser Processing on the Friction and Wear Performance of Ceramic Cutter

Objective To optimize the morphology of micro texture on ceramic cutter surface in order to obtain micro texture with better antifriction performance. Methods Through friction and wear experiment, the influence of micro texture on the friction and wear performance of ceramic cutter was studied using single factor studies. Surface friction coefficient under different morphology was measured and the wear morphology was inspected. Through the finite element analysis software ABAQUS, the friction process of micro texture surface was analyzed. The effect of different texture on stress distribution of the cutter was studied. Results Under the condition of 90 N, 300 r / min, 30 min in the friction and wear test, the friction coefficient of the tool was about 0. 42, the radial micro texture on ceramic cutter surface, namely the direction of micro texture was vertical with the direction of motion had a low friction coefficient of only about 0. 35. The stress concentration on the surface of the cutter without texture occurred in the forefront of deputy contact with the cutter grinding, which ranged from about 16. 68 MPa to 18. 19 MPa. Stress concentration was easy to cause partial wear. When the directions of micro texture and speed were vertical, the equivalent stress value ranged from about 21. 96 MPa to 31. 37 MPa. The stress distribution was more even, the stress was on both sides of the groove and the cutter was more wear-resisting. Conclusion Compared to cutter without texture, the cutter processed with micro texture such as radial micro texture, cross micro texture and crater texture reduced the surface friction coefficient, improved the wear resistance performance. And the stress distribution was more homogeneous.