INCREASING THE DURABILITY OF PLOUGHSHARES WITH WEAR RESISTANT HARDFACING

The authors have carried out an analysis of various materials used for obtaining high-strength wear-resistant coatings of the cutting edges of ploughshares. When choosing the method of hardening of agricultural working elements, it is necessary to take into account the maximum possible thickness of the hardened layer, the penetration and adhesion of the hard alloy to the base metal, process performance and the “price-quality” criterion. Steel grade 30ХГСА has shown the best “price-quality” properties as compared with those produced by the domestic metallurgical enterprises. Domestic reinforcing materials in the form of powders, electrodes, wires generally correspond in hardness and wear resistance to foreign analogues, however, it is necessary to take into account that in the strength of their adhesion to the base metal, adhesive properties, chipping and delamination of fragments of the reinforcing layer under shock loads they are 1.5 … 2.5 times lower in performance. The paper describes the design of the new ploughshare consisting of a blade and a face-mounted chisel. The material for the ploughshare is 30ХГСА steel grade. The reinforcing material is ФБХ-6-2 with 35% WC, the hardening method is plasma surfacing with a thickness of 0.5…4.5 mm. The results of field tests have shown the advantage of experimental ploughshares with a chisel overlap in resource by 2.5...4 times, in strength by 3...5 times compared with conventional ploughshares.