Friction resistance widely exists in actual production and our life. The friction between moving pairs will lead to the gradual loss or migration of part surface materials, that is, the formation of wear. Wear not only consumes energy and materials, reduces the operation efficiency of equipment, but also accelerates the scrapping of equipment, leads to frequent replacement of parts, and causes great economic losses. Gear mechanism is a very important transmission component in mechanical transmission. In the process of gear transmission, it is often scrapped because of gear wear and failure. In order to solve this technical problem and improve the wear resistance and bearing capacity of transmission gear, this paper processes the surface of gear model specimen into different bionic non smooth shapes from the angle of the combination of bionic surface modification and modification, The micro friction and wear test shows that the wear resistance is obviously improved. The specific work and conclusions can be summarized as follows:
- The 3D scanner is used to measure the gear surface. Considering the difficulty of overall scanning and the symmetry of gear structure in the actual scanning, only the gear is scanned locally, and then the point cloud is processed by surfacer software, and the noise is removed by manual method, A tooth profile with good scanning effect is taken out from the point group after noise removal as the research object. The surface model of a single tooth profile is generated by the method of surface splicing, and then the overall surface model of the gear is obtained by using the mirror function in the software. Finally, the reconstructed surface is imported into UG software to obtain the three-dimensional geometric solid model of the gear.
- From the perspective of bionics principle, nine pit shaped bionic non smooth surface shapes with different sizes and spacing are designed. The surface of gear model specimen is micro non smooth treated by jhm-1gy-100b laser NC machining machine and laser surface remelting strengthening technology. The surface layer obtains relatively hard and wear-resistant microstructure and non smooth surface shape.
- Using the experimental optimization design theory, the orthogonal experimental design is used to arrange the experimental scheme. Through the exploratory test, the four main factors affecting the wear in this test are determined: the size, distance, speed and load of the non smooth unit, and the appropriate level of each factor is determined. Through the comparative test of wear resistance between smooth and bionic non smooth gear model specimens, it can be seen that the non smooth surface morphology does have wear resistance.
The test results are compared and analyzed in the form of curve. Through the comparison curve, it can be seen that the volumetric wear rate increases gradually with the increase of load and speed. On the contrary, the friction coefficient decreases gradually with the increase of load and speed.