STRUCTURAL ANALYSIS AND RATIONAL DESIGN OF MECHANISMS OF CROSS-ROLL TUBE STRAIGHTENING MACHINES

Journal Title: Наука та прогрес транспорту - Year 2018, Vol 0, Issue 5

Abstract

Purpose. The article is aimed to perform a structural analysis of the main and auxiliary mechanisms of tube straightening machines, to identify structural and local redundant links in the mechanism schemes, and to offer recommendations on their rational design. Methodology. The solution is realized by means of the theory of mechanisms and machines using structural analysis of the mechanisms of tube straightening machines based on the universal structural theory of O.G. Ozol. Findings. The extended principle of the machine’s mechanism formation, which provides inclusion to the mechanism not only невільних solid bodies, but also the deformed bodies, allows us to consider the structure of machines for pressure processing of metals, taking into account the plastically deformed workpiece. Therefore, such machines include in their composition a deformed workpiece as an integral part of the machine mechanism, whose deformation and addition of certain geometric parameters to it is the reason the tube straightener was created for. Defects in the machine structure are determined by the local and structural redundant links included in the kinematic chains of the mechanisms, which transform the mechanism into a statically undetermined system. Movement of the mechanism with defects in the structure is possible in the presence of gaps or due to deformation of the links. The main mechanism of the tube straightening machine is a mechanism of variable structure, therefore, an analysis for its two states is carried out: before the tube is caught by the rollers and during its straightening. For calculation of the number of mobilities of the outer «roll – tube» pair, it was taken into consideration that most of the coordinates are overlaid with non-retentive links, which contain a fractional number of constraints. Fifteen redundant links were identified in the main mechanism and their amount in the auxiliary mechanisms of the tube straightening machine was established. Originality. The structural analysis of tube straightening machines with the search for redundant links was never performed. A structural analysis of the mechanisms of cross roll tube straightening machine was performed for the first time, taking into account the presence of external fractional links that are superimposed in the «roll-tube» pairs. Practical value. The practical recommendations for eliminating the harmful redundant links that were found in the structural analysis of the main and auxiliary mechanisms of the tube straightening machine were developed.

Authors and Affiliations

S. S. Zdanevich, R. P. Pogrebnyak, S. V. Zdanevich

Keywords

Related Articles

ОЦІНКА ЯКОСТІ ДОСТАВКИ ВАНТАЖІВ ЗА ДОПОМОГОЮ КОЕФІЦІЄНТА ВІДХИЛЕННЯ ЧАСУ ПРИБУТТЯ ПОЇЗДА

Мета. Дослідження спрямовано на розгляд особливостей обчислення коефіцієнта відхилення часу прибуття поїзда на станцію від запланованого по відношенню до очікуваного відхилення. На теперішній час для управління перевезен...

МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ ПОСЛЕДСТВИЙ ИСПАРЕНИЯ АВАРИЙНОГО ПРОЛИВА ТОКСИЧНОГО ВЕЩЕСТВА НА ЖЕЛЕЗНОДОРОЖНОМ ТРАНСПОРТЕ

Цель. Основной целью работы является расчет пространственных полей распределения условной вероятности летального поражения обслуживающего персонала железнодорожной станции, вызванного ингаляцией токсичного газа, который...

THEORETICAL AND EXPERIMENTAL RESEARCH OF STRENGTH PROPERTIES OF SPINE BEAM OF FREIGHT CARS

Purpose. The purpose of this paper is to analyze the results of theoretical and experimental studies of the strength properties of rolling stock; search for design tools, modeling, selection, justification of the service...

ОСОБЕННОСТИ МИКРОСТРУКТУРЫ ХРОМО-НИКЕЛЕВОГО ПОКРЫТИЯ, НАПЛАВЛЕННОГО ПОРОШКОВОЙ ЛЕНТОЙ ПЛ АН-111 С 50 % ПЕРЕКРЫТИЕМ

Цель. В работе предполагается провести исследование особенностей микроструктуры покрытия, полученного наплавкой порошковой лентой ПЛ АН-111 с 50 % перекрытием валиков. Методика. Износостойкий слой получен электродуговой...

MODELING OF BIOLOGICAL WASTEWATER TREATMENT ON THE BASIS OF QUICK-COMPUTING NUMERICAL MODEL

Purpose. The scientific paper involves the development of quick computing numerical model for prediction of output parameters of aeration tank. The numerical model may be used in predicting the effectiveness of aeration...

Download PDF file
  • EP ID EP432076
  • DOI 10.15802/stp2018/147630
  • Views 89
  • Downloads 0

How To Cite

S. S. Zdanevich, R. P. Pogrebnyak, S. V. Zdanevich (2018). STRUCTURAL ANALYSIS AND RATIONAL DESIGN OF MECHANISMS OF CROSS-ROLL TUBE STRAIGHTENING MACHINES. Наука та прогрес транспорту, 0(5), 65-73. https://europub.co.uk/articles/-A-432076