Study on repair techniques of loader pin based on remanufacturing

摘要

Pins of loader are damaged easily, and most of them have been abandoned every year. Remanufacturing for pins can reduce waste of natural resources and energy sources. In this paper, pins with different abrasion loss were selected and remanufactured by electrical arc spraying and oxy-acetylene flame spray welding, respectively. Then, the parameters of remanufactured pins such as dimension, surface roughness, surface hardness and crack were measured. Furthermore, the friction and wear characteristics of the repair coating/nickel coating pair were tested under dry lubrication condition with the MRH-3 high-speed ring-block friction and wear testing machine. With the help of SEM (scanning electron microscope) to observe the surface morphology of blocks, abrasion resistance of spray welding coating and spray coating were analyzed. Results indicate that two remanufacturing techniques both can make the scrap pins as new products, but pins which are remanufactured in the way of oxy-acetylene flame spray welding have better abrasion resistance than the way of electrical arc spraying.