Vibrations in engineering and technology

Vakulenko Roman –, Candidate of Technical Sciences, Associate Professor of the Department of industrial Engineering Mikhailo Ostrohradskyi Кremenchuk National University (St. University , 20, Кremenchuk, Ukraine, 39600, e-mail: rom.vak311@gmail.com). https://orcid.org/0000-0002-8845-962X

Salenko Yulia –, Doctor of Technical Sciences, Professor of the Department of industrial Engineering Mikhailo Ostrohradskyi Кremenchuk National University (St. University , 20, Кremenchuk, Ukraine, 39600, e-mail: salenko.yulia.75@gmail.com) https://orcid.org/0000-0002-5458-0990

Ikalchyk Mykola – Candidate of Technical Sciences, Associate Professor of the Department of agroengineering and transport technologies Separated subdivision of the National University of Bioresources and Nature Management of Ukraine "Nizhyn Agrotechnical Institute" (Shevchenko str., 10, Nizhyn, Chernihiv region., Ukraine, 16600, e-mail: m.ikalchyk@gmail.com). http:// orcid.org/ 0000-0001-7085-2952

In the article, when studying the expansion of a local section of a pipe, the following assumptions were adopted: a plane strain state of deformation; maximum deformations are tangential and are determined by the ratio of the diameters before and after deformation; deformation of the tube sheet in a local area occurs as the indentation of a linear punch into a half-space.

Ballistic and strength calculations of the technological equipment were carried out during the design stage. In the experimental phase, a PC-84 powder-actuated mounting pistol, commonly used in construction for making holes in reinforced concrete beams and for fastening operations with dowels, was used for tube expansion.

The main focus was on the development of the tooling design. A punch design was proposed both in the form of a split collet and in the form of separate segments, with preference given to the latter. It was established that a large number of slots in the collet is undesirable, as it leads to increased faceting and, consequently, a reduction in joint quality. Strength calculations of the collet petals showed that with a small number of slots, high bending stresses occur at their roots, which significantly reduces the stability of the collet.

A structural scheme of the expansion tooling is presented. Working documentation was prepared, and tooling for fastening pipes was manufactured and subsequently used in developing the technology for joining pipes to tube sheets. Experimental studies were carried out on fragments of tube sheets.

An analysis of energy capabilities was performed. It was experimentally determined that by varying the charge magnitude, processing can be performed using the PC-84 mounting pistol. Relative values of faceting for different design configurations of punch segments and joint parameters are presented. It was found that increasing the number of segments significantly improves the stability of the tooling set.

Machining of the segment surfaces was carried out in assembly with a mandrel in the working position (in the gap formed along the diametral planes of the segments, plates of appropriate thickness were installed to ensure high-quality machining).

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