Restoration of a tractor part by the method of electric arc metallization

Abstract

Relevance. Tractors are distinguished by long inter-service ranges and easy maintenance. But if the tractor components are not serviced in a timely manner (oil change, filters, and so on), the resulting contamination will begin to damage the parts, and increased friction will contribute to their wear and overheating. Since there is currently an acute shortage of original spare parts and their prices are quite high, the development of technological solutions for the restoration of worn-out seats of tractor parts is relevant. One of the coating methods, namely electric arc spraying, can solve this problem. The purpose of the study: using the example of the drive axis of a cylindrical straight tooth gear of a “John Deere” tractor, develop a technology for restoring a worn-out seat by electric arc spraying for the installation of a bearing or an oil seal. Methods. The brand of the axis material corresponding to the Russian analogue has been determined. The hardness of the axis base was measured with a TK-2M hardness tester. Preliminary mechanical treatment of the restored surface has been carried out. Additionally, jet-corundum treatment of the worn surface was carried out. The technology of electric arc spraying has been applied to obtain the necessary coating. Turning of the restored surface was performed until the nominal diameter of the axle seat was obtained. Results. The technology of restoration of the axle seat by supersonic electric arc spraying has been developed. The expediency and necessity of preliminary mechanical action on the seat, consisting in threading and jet-corundum processing, before the process of supersonic electric arc spraying are established. The results of the study showed the effectiveness of the electric arc spraying method for restoring the worn-out seat of the drive axis of a cylindrical straight tooth gear in tractors. The cost of restoring one worn-out axle seat was 3,000 rubles, which is more than 10 times cheaper than the original spare part. At the same time, all the mechanical properties of the part have been preserved. It is recommended to use the method of electric arc spraying to restore the worn-out seat of the axles of all imported agricultural machines.