HMn58-2配流盘摩擦副表面激光加工微阵列对其摩擦磨损性能的影响

Influence of the Laser Processing Micro Array on the Friction Pair Surface of HMn58-2 Valve Plate to Its Friction and Wear Performance

轴向柱塞泵配流盘摩擦副长期处于高速相对滑动和重接触载荷工况下,因此,其摩擦磨损性能对配流盘服役寿命至关重要。采用光纤激光器在HMn58-2配流盘摩擦副表面加工了微阵列结构。在MMW-1A摩擦磨损机上,选用摩擦副常用配偶材料38CrMoAl以面-面接触形式分别对具有微阵列和未改性HMn58-2配流盘摩擦副摩擦磨损性能进行了测试。采用正交实验方法分析了激光加工微阵列直径、深度、密度、载荷和转速对试样摩擦磨损性能的影响及磨损机理。试验结果表明:与未经加工HMn58-2光滑试样相比,激光加工微阵列降低了HMn58-2试样表面摩擦系数,减轻了磨粒磨损和黏着磨损程度;各因素对激光表面改性试样摩擦磨损影响程度依次为载荷、微阵列深度、转速、微阵列直径和密度。

The friction pair of the valve plate of axial piston pump is under the conditions of high-speed,with relative slipping and heavy-load for a long time.Therefore,the friction-wear performance has an important influence on the service life of the valve plate.Fiber laser is used to process micro array structure on the HMn58-2 valve plate friction pair surface.The friction and wear properties of the unmodified HMn58-2 valve plate specimen and the specimen with micro array are measured on the MMW-1A wear-friction machine,with 38CrMoAl as the counter grinding couple and a surface-to-surface contacting pattern.An orthogonal experiment method is used to analyze the wear mechanism and the influences of diameter,depth,density,load and rotation speed of the laser processing micro array on the friction and wear performance of the specimen.The experimental results showed that,compared with unprocessed smooth specimen,the laser processed micro array reduces the surface friction coefficient of the HMn58-2 sample and reduces the degree of abrasive wear and adhesive wear.The influencing effects of factors on the friction-wear performances of the laser modified surface are respectively load,depth of the array,rotation speed,and diameter and density of the array pit.