DETERMINATION OF RESIDUAL LIFE OF MECHANICAL GEARS MINING MACHINES BY MEASURING THE SURFACE HARDNESS OF THE METAL IN AREAS OF HIGH WEAR AND TEAR

Details

Parent Category: Geo-Technical Mechanics, 2014

Category: Geo-Technical Mechanics, 2014, Issue 119

UDC 621.81.539.4

Authors:

Zvonaryov I,Ye., Ph.D.(Tech.),

Ivanov S.L., D.Sc. (Tech), professor,

Fokin A.S., Ph.D.(Tech.), Associate Professor

(National raw mineral-material University «MINE», Saint Petersburg)

Shishlyannikov D.I., Ph.D.(Tech.), Associate Professor,

Grishina I.O., Student

(Permskiy National research polytechnic university)

Abstract. The article deals with the  basic methods of energy resource determination of mining machine manual transmission components. Analyzing  the damage accumulation process in the metal of  train of gears the remaining life assessment method of coarse-pitch train of gears was justified by means of repeatable measurements of train of gears surface layer hardness. The regularity of changes in the train of gears surface layer hardness was revealed which is  determined by the changes in the metal strength properties. It makes possible to take into account the micro and macromechanisms plastic and elastic deformation, warping of the metal matrix lattice and formation and movement  of vacancy defect and dislocation. For the purpose of the  investigation of the  size  influence and kind of loading on the components resource of the mining machines manual transmission a test equipment was made and experiments were carried out. The experiments were connected with the breaking of non-standard samples, tension, action of both bending and tension loading. Parameters of samples deformation and local metal hardness changes surrounding the breaking surfaces were determined. Geometry and hardness of the samples comparison leads to the conclusion that critical deformation matches the growth of hardness, the limiting value of which for this material is in the failure zone. According to the experimental results it was determined that the detected character of local hardness changes happens in the zones of tension increase which is higher of the level of proportionality and that the action of breaking  forces is represented by the increase of hardness and is a constant.

Keywords:

 mining machine, diagnosing, energy resource, remaining life assessment, manual transmission, coarse-pitch train of gears, breaking, tearing, surface layer hardness, tension.

References:

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About the authors:

Zvonaryov Ivan Yevgenyevich, Candidate of Technical Sciences (Ph. D.), Assistant of the Department of Mechanical Engineering, National Mineral Resources University (Mining University), St. Petersburg, RU, This email address is being protected from spambots. You need JavaScript enabled to view it.

Ivanov Sergey Leonidovich,  Doctor of  Technical Sciences (D.Sc.), Professor of the  Department of Mechanical Engineering, National Mineral Resources University (Mining University), St. Petersburg, RU, This email address is being protected from spambots. You need JavaScript enabled to view it.

Fokin Andrey Sergeevich, Candidate of Technical Sciences (Ph. D.), Associate Professor of the Department of Mechanical Engineering, National Mineral Resources University (Mining University), St. Petersburg, RU, This email address is being protected from spambots. You need JavaScript enabled to view it.

Shishlyannikov Dmitry Igorevich, Candidate of Technical Sciences (Ph. D.), Associate Professor of the Department of Mining and Oilfield Machinery, Perm National Research Polytechnic University, Perm, RU, This email address is being protected from spambots. You need JavaScript enabled to view it.

Grishina Irina Olegovna, Student of the Department of Mining and Oilfield Machinery, Perm National Research Polytechnic University, Perm, RU, This email address is being protected from spambots. You need JavaScript enabled to view it.

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