Engineering, Energy, Transport AIC

Muzychuk Vasyl – PhD, Associate Professor of the Department of “Technological Processes and Equipment of Processing and Food Productions” of the Vinnytsia National Agrarian University (3 Solnechnaya St, Vinnytsia, 21008, Ukraine, e-mail: wasil@vsau.vin.ua).

Tokarchuk Oleksii – PhD, Associate Professor of the Department of “Technological Processes and Equipment of Processing and Food Productions” of the Vinnytsia National Agrarian University (3, Solnyshchaya St., Vinnytsia, 21008, Ukraine, e-mail: tokarchuk@vsau.vin.ua ).

The method of determination of contact normal and tangential stresses during rolling is considered, taking into account the development of deformation over time.

There are many methods for determining the contact normal and tangential stresses, but they all consider the distribution along the strain boundary. This approach to solving problems does not allow to take into account the uneven deformation in the transverse direction and the influence of lateral non-contact zones adjacent to the actual deformation center. These factors should be taken into account when determining the tangent and normal stresses when rolling in calibers with different ratios of geometric shapes and rolling billet. Also, existing methods of determining contact normal and tangential stresses do not take into account the development of deformation over time.

Deriving the equations that determine the deformation force of the friction force and pressure, it was assumed that the normal to the plane would not coincide with any of the axes of the coordinate system, and the inclined platform was considered as an inclined section in the parallelepiped voltage across the edges of the volume, which is distributed uniformly.

The obtained formulas for determining the normal and tangent contact stresses in the deformation zone take into account rolling in calibers with different ratio of geometric shapes and rolling billet, characterize the dynamics of change of the deformation cell in time.

The paper deals with rolling of AK6 alloy workpieces having Ø25x150 mm dimensions in oval caliber, with a height of 13 mm and a width of 29 mm and calculated normal and contact stresses. The plots of normal and tangent stresses show a change in the value of stress with increasing contact area and deformation time.

The results of studies of normal and tangent stresses show a change in their values with increasing contact area and deformation time.

When checking the proposed method, the discrepancy between the results of the theoretical calculation and the experimental data is not more than 4%, which confirms the possibility of using the method to determine the contact normal and tangential stresses during rolling.

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[2] Muzychuk, V. I., Nakhaichuk, O. V., Sivak, R. I. (2012). Plastichnist alyuminiyevikh splaviv pri izotermichnomu valczyuvanni zagotovok [Plasticity of aluminum alloys during isothermal rolling of billets]. Vibracziyi v tekhniczi i tekhnologiyakh, 2(66), 82–86. [in Ukrainian].

[3] Ogorodnikov, V. A., Muzychuk, V. I., Nakhaychuk, O. V. (2007). Mekhanika protsessov kholodnogo formoizmeneniya s odnotipnymi skhemami mekhanizma deformatsii [Mechanics of cold forming processes with the same type of deformation mechanism]. Monografiya. V.: Universum. Vinnitsa. [in Ukrainian].

[4] Grudyev, A. P. (1988). Teoriya prokatki [Rolling theory]. M.: Metalurgiya. [in Russian].

[5] Matvijchuk, V. A., Mikhalevich, V. M. (2016). Rozvitok proczesiv lokalnogo deformuvannya [Development of local deformation processes]. Monografiya: Teoriya i praktika obrobki materialiv tiskom. AT «Motor Sich». [in Ukrainian].

[6] Sivak, R. I., Koczyubivska, K. I., Sukhorukov, S. I. (2016). Vpliv protitisku, shho stvoryuyetsya tverdim seredovishhem, na deformivnyast zagotovok pri radialnomu vidavlyuvanni [The influence of the pressure created by the solid medium on the deformability of the workpieces during radial extrusion]. Visnik mashinobuduvannya ta transportu, 2(4), 101–108. [in Ukrainian].

[7] Lyubin, M. V., Tokarchuk, O. A. (2019). Vpliv sposobu kriplennya bezstruzhkovikh mitchikiv na proczes vitiskuvannya rizbi [The influence of the method of fastening the stringless taps on the process of squeezing the thread]. Vibracziyi v tekhniczi ta tekhnologiyakh. Vi`nniczya VNAU, 2(93), 56–61. [in Ukrainian].

[8] Veselovska, N. R., Turich, V. V., Rutkevich, V. S. (2017). Kontaktna vzayemodi`ya i`nstrumenta z detallyu u proczesakh poverkhnevogo plastichnogo deformuvannya z ultrazvukom [Contact of the tool with the part in the processes of surface plastic deformation with ultrasound]. Vibracziyi v tekhniczi ta tekhnologiyakh. 2(85). 51–58. [in Ukrainian].