INCREASING THE RESOURCE OF TRACTOR GEAR OPERATING SHAFTS
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 82, Issue
Abstract
According to statistics, up to 75 % of tractor failure is caused by the gearbox. The main reason for premature failure of up to 80% of machine parts is in-tense wear. Of these, up to 20% is the number of failures due to the unsuccessful selection of material of parts and poor quality of its thermal treatment. These details include the gear operating shaft, which is the subject of the research. The decreased by almost 10 times operation life (100 motor-hours instead of the factory-set 8000) is associated with the use of chemical-thermal treatment (CTT), which is inappropriate for thin details of considerable length, moreover, those with a variable section. Vol-ume hardening (an integral process of CTT), causes significant deformation of such parts and the need for finite mechanical treatment, which destroys a significant part of the strengthened surface layer. As a result there is the wear and tear of the surface in conditions of friction, considerable pressure and shock loads. Significant wear results in the need to reduce the load on the surfaces that are subject to friction, increase the cost of repairs and manufac-ture of spare parts (of materials, electricity, labour). Increasing the long life of the tractor gear operating shafts is definitely a topical task. Increasing the service life of shafts of a gearbox, while reducing the cost of their production and improving environmental performance, is definitely an important task that was solved in this work. The purpose of this work is to solve this acute problem by replacing the CTT with superficial induction hardening, which has undeniable advantages: the stability of the strengthened layer; significant reduction of the pro-cessing time; obtaining finer grain of the surface layer, which improves the complex of mechanical characteristics; providing favorable compressive stresses; substantial reduction of the cost of electricity, as it heats up ~ 5% of the total metal parts, improving the environmental situation. In this work, research was carried out on the choice of the steel grade, the diameter of the inductor and the parame-ters of the technological process of hardening, which provided the necessary structure and hard-ness to obtain a quality wear-resistant surface layer, which in its properties meets the requirements of production. The replacement of CTT with superficial induction hardening allowed to increase the durability of shafts by 3 times, to reduce the processing time almost twice, to increase productivity, improve environmental conditions, and reduce the cost of parts.
Authors and Affiliations
І. V. Doschechkina
Keywords
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- EP ID EP477530
- DOI 10.30977/BUL.2219-5548.2018.82.0.68
- Views 91
- Downloads 0
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