Field Tests of Performance of Built-Up Ripper Crown of Komatsu D375A Bulldozer
Abstract
As the long-term practice shows operation of mining equipment under extreme conditions of the North results in intensive wear, first of all, of working elements. Increase of service life of the cutting details of the digging equipment working at low climatictemperatures is especially actual. Materials of working elements of digging equipment are rather expensive; therefore forincrease of wear resistance of the cutting details their restoration with hardening is expedient. At the same time the mostpromising is use of high-energy technologies of powder metallurgy which are rather developed now. Therefore also the analysisof nature of wear of the restored working elements of equipment at operation in natural climatic conditions of the North isactual.
Results of field tests for wear and durability of the built-up crown of the ripper of the bulldozer Komatsu D375A are given in the work. It is established that the restored crown has high rates of durability to a break and wear resistance and its operational properties practically doesn't differ from new factory analogs. The results of analytical study of the built-up layer and comparative profilometric measurements of equilibrium surfaces of friction are presented. It is established that the chemical composition of the built-up layer differs from initial steel of a crown in the increased content of chrome (Cr), molybdenum (Mo), manganese (Mn) and vanadium (V). It is revealed that the hardness of the material of thebuilt-up layer makes 55–62 HRC that on ~ 40% are higher than the hardness of the initial crown.
About the Authors
Dmitriy Iosifovich Lebedev
Larionov Institute of the Physical-Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Mikhail Vladimirovich Fedorov
Larionov Institute of the Physical-Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Nikolay Innokentievich Golikov
Larionov Institute of the Physical-Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Ruslan Prokopievich Tikhonov
Larionov Institute of the Physical-Technical Problems of the North SB RAS
Russian Federation
Russian Federation
Gennadiy Georgievich Vinokurov
Larionov Institute of the Physical-Technical Problems of the North SB RAS
Russian Federation
Russian Federation
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Review
For citations:
Lebedev D.I., Fedorov M.V., Golikov N.I., Tikhonov R.P., Vinokurov G.G. Field Tests of Performance of Built-Up Ripper Crown of Komatsu D375A Bulldozer. Arctic and Subarctic Natural Resources. 2016;21(2):81-86. (In Russ.)
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