Authors: E.E. Levashova, M.V. Pimonov, N.V. Ababkov

Title of the article: Life prediction of part “Axle” after restoration

Year: 2020, Issue: 6, Pages: 3-9

Branch of knowledge: 05.02.02 Mechanical engineering, drive systems and machine parts

Index UDK: 622-1/-9

DOI: 10.26730/1816-4528-2020-6-3-9

Abstract: The article presents an example of life prediction of a heavy-duty part of the "axle" type connecting the bucket and the lugs of the boom of a mining excavator after applying the recovery technology, which consists in the use of mechanized surfacing with subsequent electric arc thermal hardening. A frequent cause of excavator breakdown is the wear of this part, due to the appearance of scoring, microcracks on the surface, as well as metal chipping during friction, which leads to an increase in gaps and accelerated wear of the part. The calculation was carried out on the basis of the obtained results of finite element modeling, with the endurance limit chosen as one of the strength characteristics of the material. The calculation established comparable stresses arising in the model of the original part and after restoration, therefore the calculation was performed for the part after restoration. It has been established that the maximum stresses arising in the model of the original part and the part after restoration by mechanized surfacing with subsequent electric arc thermal hardening differ by 0.1 MPa, which does not significantly affect the residual life of the part. The calculation of the approximate number of cycles (3.4 million) of work of the "axle" part, which is comparable to the service life of the original part, has been performed.

Key words: restoration surfacing mechanical properties hardness tensile strength finite element modeling

Receiving date: 20.11.2020

Publication date: 29.12.2020

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