Abstract
The study relevance is due to the fact that the wear of the working bodies of seeding machines leads to increased fuel consumption, deterioration of the quality of seed placement, and reduced yields. In this regard, this article is aimed at studying the condition of hardened working parts of the experimental grain-fertilizer-grass seeder. Based on the results of information search, the following hardening methods were adopted: electric arc cladding with hard-alloy electrodes and sormite; heating of the chisels by HFC quenching. Samples of experimental bits of coulter bits of a grain and grass seeder made of 65G steel were used for research. The state of worn surface layers of chisels was studied by ultrasonic flaw detector. Research has allowed to establish that among hardened samples the smallest equivalent area of wear has the sample, hardened full working surface by cladding with electrodes T590, and also according to the results of field experiments this sample had the greatest resistance to abrasive impact. On the basis of these results as the most rational method of chisel hardening for production conditions in agricultural enterprises it is recommended to replace the typical factory heat treatment with cladding of the full working part of chisel.