Vibrations in engineering and technology

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).

Schemes and methods of manufacturing parts such as disks from square blanks obtained by stamping are studied. The possibility of controlling boundary conditions, creating various schemes of stress-strain state in local zones, changing the nature of metal flow, providing relatively low levels of residual stresses and anisotropy of mechanical properties in the longitudinal and transverse directions, allowing to stamp rolling workpieces.

It is shown that in the technological process of stamping by running-in of annular workpieces of parts from a square workpiece, a metal displacer passes in different axial directions of the workpiece through three stages of forming. Deformation resistance throughout the volume of the part is also different. As a result, there are additional stresses: on the outer surface - compressive, as each inner layer restrains the movement of the neighboring outer, and in the inner - stretching, as each outer layer, moving faster than the neighboring, captures it.

The device of manufacturing of details of type of disks from square preparations is offered in work. The principle of operation of this device is that the original workpiece with a square cross section before installation in the matrix is pre-fixed relative to its angles. As a result of stress equalization, there is a zone of inner layers with additional radial stress, which increases to the outer.

The use of the device proposed in the work makes it possible to stamp parts without waste, to expand the range of products obtained, as well as to reduce the cost of manufacturing the product by facilitating the flow of metal.

The calculation formula for determining the size of the original square workpiece is proposed. The choice of the sizes of initial preparations according to the calculation formula simplifies their preparation by felling, facilitates centering at stacking in a stamp, and the main thing provides high accuracy of the size on height and absence of anisotropy unlike the circles cut out from a sheet.

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7. Ohorodnikov, V. A., Muzychuk, O. V., Nakhaychuk, V. I. (2007). Mekhanika protsesiv kholodnoho formozminyuvannya z odnotypnymy skhemamy mekhanizmu deformatsiyi. Monohrafiya [Mechanics of cold forming processes with the same type of deformation mechanism schemes. Monograph]. V: UNIVERSUM-Vinnytsya [in Ukrainian].

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