Abstract
The work is devoted to the study of the heat balance of the tool part during the electroarc processing of plowshares and the rationale for the rational parameters of local hardening, which will increase the wear resistance of the surfaces of the parts of tillage machines by their reflow using electroarc processing. The article presents the energy indicators of the electroarc processing of plowshares. According to the analysis of recent studies, it was found that for the simultaneous sharpening and hardening of plowshares, it is rational to use a DC arc discharge with liquid cooling and with the formation of hardened structures. Based on the results of theoretical studies, the heat balance is determined by the electroarc processing, which allows you to establish the most significant factors that affect the energy performance of the process, namely: the speed of electroarc processing V, voltage U and current density j of the electroarc processing. According to the results of experimental studies, it was found that with an increase in voltage U from 40 to 55 V and current density j from 3.0 to 3.5 3.5 A/mm2 , the speed of electrical contact processing V increases from 7.7 up to 12.5 mm, which made it possible to set for a rational – average speed of 10.1 mm/s for automatic movement of the surface of repair inserts for plowshares relative to the electrode-tool of the installation for electrical contact processing.
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