Economic feasibility of using the technology of carbon-vibro-arc hardening for hardening the pointed paws of tillage machinery

Abstract

The article describes the rational technology of carbo-vibro-arc hardening (CVAH) developed by the authors using a multicomponent paste of the working surfaces of the pointed paw of tillage machinery. An economic assessment of the feasibility of using CVAH for strengthening pointed paws was carried out. PG-FBKh6-2 powder was used for research as the basis of a multicomponent paste for CVAH. The boron carbide B4C served as a ceramic component of the paste, the mass content of cryolite was 10 %. CVAH was carried out on a VDGU-2 installation. A carbon electrode of 8 mm in diameter was used to form reinforcing composite coatings.
 The implementation of developed technology involves firstly the cleaning of working part of the paw. Then a multicomponent paste is prepared, it is applied to the surfaces, hardened and dried until cured. After it the CVAH is done with the formation of a composite coating and the resulting coating is monitored. The rational composition of the multicomponent paste according to the results of a set of studies should be as follows: PG-FBH6-2 powder 60 % by weight, B4C 30 % by weight, cryolite the rest. Rational CVAH modes: current strength 70 ... 80 A, carbon electrode vibration frequency 25 Hz, electrode vibration amplitude 1,1 mm. The thickness of the formed reinforcing composite coating is 0,91,0 mm, and its hardness is 7072 HRC. The developed technology, due to low additional capital investments, can be used both in small workshops of farms and in the conditions of specialized repair and restoration enterprises. The calculation of the economic efficiency of the developed technology for strengthening pointed paws showed that the expected annual economic effect from the introduction of the technology will be 120, 191 rubles with the hardening of 430 blades of KShU-12N cultivators. Thus, the developed technology is economically feasible and can be recommended for implementation in production.