Vibrations in engineering and technology

Shvets Ludmila - PhD, Associate Professor, Department of Agricultural Engineering and Technical Service Vinnytsia National Agrarian University (Sunny str., 3, Vinnytsia, Ukraine, 21008, shlv0505@i.ua).

Defects of case details include operation of openings under bearings within 0,2 - 0,4 mm on the party, operation of landing belts under sleeves.  When restoring them, traditional methods are used: installation of repair bushings, application of polymer and electrolytic coatings, micron smelting, electrospark treatment, etc.  Restored parts must have hardness and wear resistance with the parameters of the material of the reducing part (deviation 10 - 15%), have sufficient adhesion to the base metal, corrosion resistance in a humid environment, provide maximum contact area with the conjugate part, no pores, slag, foreign inclusions  .

The method of restoration must eliminate the thermal impact on the part and be cost-effective.

Polymer compositions are usually brittle, subject to breakage and leaching.  Surfacing causes warping of the part, bleaching of cast iron, the formation of slag and pores in the deposited layer.  The electrospark coating method does not provide sufficient contact area with the conjugate part.

The use of electrolytes for iron seats in some enterprises is aggressive, unstable, requires heating or the use of expensive thyristor power supplies, followed by machining, as the microhardness of precipitation reaches a large value depending on the composition of the electrolyte and process modes, have high internal voltage.

The proposed device for restoring the bearings simplifies the existing method and meets the technical requirements of manufacturers in terms of machining accuracy (ovality, taper, coaxiality and surface roughness), provides high productivity (2 times higher than the productivity of specialized machines horizontally).  and low cost (60 times lower than the cost of specialized machines).

1. Budyak RV, Posvyatenko EK, Shvets LV, Zhuchenko GA (2020) Construction materials and technologies: Vinnytsia: VNAU, 2020. 240 p. [in Ukrainian].

2. Kalchenko VI, Kalchenko VV, Venzhega VI (2013) Restoration of car parts.  Chernihiv: ChNTU, 2013. 192p. [in Ukrainian].

3. Shvets LV, Paladiychuk YB, Trukhanskaya OO  (2019)Technical service in the agro-industrial complex.  Tom I. Textbook.  VNAU, 2019. [in Ukrainian].

4. Posviatenko E., Budyak R.,Shvets L. (2018) Influence of a material and the technological factors on improvement of operating properties of machine parts by reliefs and film coatings. Eastern-European Journal of Enterprise Technologies. 2018. № 5/12 (95). P. 48-56. [in English]

5. Pulupec M., Shvets L. (2019) Characteristics and thermomechanical modes of aluminum alloys hot deformation. Current Problems of Transport: Proceedings of the 1st International Scientific Conference. Ternopil Ivan Puluj National Technical University and Scientific Publishing House «SciView». Ternopil, 2019. pp 195-204. [in English]

6. Truhanska O.O. (2020) Promising directions of technology of restoration of details of cars. Vibrations in engineering and technology 2020. №3 (98).  P.104-110. [in English]

7. Truhanska O.O. (2020) Technological methods of increasing wear resistance and durability of details. Machinery, energy, transport of agro-industrial complex. 2020. № 4 (111). С.109-115. [in English]