Substantiated methods of restoration and modes of hardening of parts of seed drills

Abstract

Purpose. Substantiated methods of restoration and modes of hardening of parts of seed drills by using wear-resistant repair elements and arc surfacing. Methods. Graphic, micrometer, accelerated testing of metal surfaces for abrasive wear. Results. Methods of restoration and modes of hardening of parts of seed drills by using wear-resistant repair elements and arc surfacing are substantiated. The developed process of restoration and hardening of parts of seed drills is implemented in the conditions of “UPI-AGRO” LLC and “Food company “Zorya Podillia” LLC, Vinnytsia region. Conclusions 1. The zones, sizes and nature of wear of parts of seed drills are determined. As a result of the analysis of the values of wear of parts of seed drills, it was established that: - the amount of linear wear of parts of the Kverneland Optima HD seed drill after their cultivation of 6 ha varies from 4 to 12 mm; - the amount of linear wear of parts of the Kuhn Planter seed drill after cultivating 43 ha varies from 4.2 to 40.7 mm. 2. The methods of restoring of parts of seed drills are substantiated: - parts of seed drills with wear of more than 6 mm should be restored by arc welding of wear-resistant materials using repair elements; - parts of seed drills with wear from 4 to 6 mm should be restored by arc welding of wear-resistant materials to the size of new parts without the use of repair elements. 3. Based on the results of experimental studies of the modes of application of wear-resistant materials, it was established that during arc welding with wear-resistant materials, the wear resistance of the coating decreases with an increase in the current intensity. The rational surfacing regime within the range of current values I from 160 to 280 A are current intensity I = 160 A at voltage U = 28 V. 4. The wear resistance of steels 30MnB5, Hardox 500, Hardox 600, which are used for production parts of seed drills, was studied. It was established that surfacing with wear-resistant materials, including ПП 180X9 wires, of the blade surfaces of the working bodies of parts of seed drills made of these steels increases their relative wear resistance by 7–13 times. Therefore, such additional hardening with wear-resistant electrodes and wires of parts of seed drills made of these steels is expedient. Keywords: restoring, defects, hardening, wear resistance, modes, parts of seed drills.