Vibrations in engineering and technology

Shvets Ludmila – Candidate of Technical Sciences, Associate Professor, Associate Professor of the Department of Agroengineering and Technical Service of Vinnytsia National Agrarian University (Sunny str., 3, Vinnytsia, Ukraine, 21008, e-mail:  shlv0505@ukr.net ).

Trukhanska Olena – Candidate of Technical Sciences, Associate Professor, Associate Professor of the Department of Agroengineering and Technical Service of Vinnytsia National Agrarian University (Solnechnaya St., 3, Vinnytsia, 21008, Ukraine, e-mail: seaswallow@ukr.net ).

Metal deformation under conditions of isothermal and near-isothermal deformation is characterized by an increase in plasticity compared to plasticity during processing in a cold tool. This is due to the lower strain rate, the lower limit of which is limited only by the productivity of the process. As a result, the time for "filling defects" that occur during metal deformation increases, the thermal stress in the work piece volume decreases, and the deformation becomes more uniform. In this work, a technique for conducting experimental studies has been developed, covering an extended range of tasks for determining the technological parameters of rolling billets from aluminum alloys under conditions of isothermal and close to it deformation.

To determine the technological parameters and thermomechanical characteristics, an installation for billet rolling under conditions of isothermal and close to it deformation is proposed. In order to ensure the rigidity of the rollers and maintain a constant center-to-center distance during the deformation process, the installation is made according to the type of two-bearing forging rollers. To maintain the temperature of the workpiece and heat the working tool (roller dies directly mounted on the rollers), the unit is equipped with a heating device installed on the back side.

On the basis of the analysis of the results of experimental studies, the optimal technological parameters of rolling blanks from aluminum alloys at variable temperatures, speeds, degrees of deformation and development of the technological process were determined. Technological recommendations for the calculation of gauges are proposed and a technical task is developed for an industrial sample of equipment for rolling blanks in conditions of isothermal and near-isothermal deformation, including work during traditional rolling without heating of rolling dies.

1. Posviatenko E., Budyak R., Paladiichuk Y., Shvets L.Hryhoryshen V.  (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. № 5/12 (95). P. 48-56. [In English].

2. Baranovsky V., Truhanska O., Pankiv M., Bandura V. (2020). Research of a contact impact of a root crop with a screw auger. Research in Agricultural Engineering / Res. Agr. Eng. 66 (1), P.33-42. [In English]

3. Budiak R. V., Posviatenko E. K., Shvets L. V., Zhuchenko H. A. (2020). Konstruktsiini materialy i tekhnolohii: navch. posib. Vinnytsia : VNAU. 240 s. [in Ukrainian].

4. 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, P. 195-204. 

5. Shvets L. (2020). Determination of parameters during hot rolling of aluminum alloys. The 2-nd International scientific and practical conference “Innovative development of science and education” (April 26-28,  2020)  ISGT Publishing House, Athens, Greece. [In English].

6. Shvets L. (2020). Extension value, with hot rolled aluminum alloy specimens, round section in smooth rollers. Scientific foundations of modern engineering: monograph. Boston: Primedia e Launch. 528 r. [In English].

7. L.V. Shvets, Yu.B. Paladiichuk, O.O. Trukhanska. (2019). Tekhnichnyi servis v APK. Tom 1: navchalnyi posibnyk. Vinnytsia: VNAU, 2019. 648s. [in Ukrainian].