Plasma Cladding And Its Application Research In Sand Collecting Shovel

In recent years,the railway industry in China has developed rapidly,at the same time,the maintenance requirements of the railways have become increasingly high.In the railway maintenance projects,especially in the desert areas of North China,due to poor working conditions,the shovel assembly collects sand than the trucks directly contacting the sand and stones to remove the sand,which is easy to wear out and fatigue damage,seriously affecting the progress of road maintenance operations and affecting the normal operation of railways.Reasonable use of local engineering to improve wear and tear performance and resist fatigue of sand collectors,and prolong their service life,that is of important practical importance.The Fe-based alloy coating layer is prepared on the surface of the sand shovel by the plasma coating process.The combination’s method of experiments and numerical simulation is used to study the performance of the layer of coating and resistance to wear and fatigue of sand shovel after life coating.The specific content of the investigation is as follows:Coating Fe-based alloy coating on the surface of No.45 steel,commonly used in sand shovels to produce plasma coating samples.Through SEM electron microscope scanning,EDS surface scanning and XRD phase detection,the effectiveness of the microstructure coating layers is investigated.Through the mechanical performance test,the hardness,toughness,landslide resistance and hardness of the coating sample were studied.Compared with No.45 steel matrix,the hardness and abrasion resistance of the coating layer have been significantly improved,but the tensile strength and toughness have decreased.A simulation model of the sand collector is established and the interaction between the sand collector and sand is analyzed using a discrete element.The discrete element and the finite element are coupled to analyze the pressure distribution of the sand shovel blade,and it is found that the liner sand blade can meet its static mechanical performance requirements.The stress and deformation of the sand shovel blades before and after coating are compared and analyzed.It is found that under the load of the Fe-based alloy coating layer,the stress and deformation of the sand shovel blades are reduced,which complaint with the requirements to improve the mechanical properties of sand fiber.The wear and life of the sand collector after coating was evaluated,and the wear resistance and service life of the sand collector before and after coating were compared.It shows that the Fe-based coating layer can greatly improve the wear resistance and fatigue life of the sand collector.To study the effect of different coating layer thicknesses on sand shovel performance in terms of fatigue damage and wear resistance of coating-free coatings,0.5 mm thick alloy coating layers and 1 mm thick religious alloys.Each coating layer.After analyzing the performance of the sand shovel,it was finally determined that a 1mm thick Fe-based alloy coating layer could better protect the surface of the sand shovel.