THE METHODOLOGY OF EXPERIMENTAL RESEARCH AND COMPARATIVE ANALYSIS OF THE TECHNOLOGY THERMALLY ACTIVATED STRETCHING OF LONG NON-RIGID PARTS
In modern engineering the most widely used method of hire. About 70 % of blank production accounts for this method, therefore, the crucial issue is the search for new and more advanced methods of manufacturing technology and quality control of this type of products. The main problem in the production of billets by the method of hire is warping. The occurrence of war page due to uneven distribution of internal stresses in the bulk material of the product. The formation of this field of internal stresses is significantly affected by technological heredity. Accordingly, the development of technology to reduce and uniform distribution of these stresses, as well as data management processes will improve the quality of this type of products and hence the operational reliability. This article discusses the features of the methodology of the experiment thermally activated stretching non-rigid parts. The test material is stainless steel 12X18H10T, the most commonly used in the manufacture of long non-rigid shafts used in the oil industry, shipbuilding and the automotive industry. Presents two technological method thermally activated stretching of long non-rigid details. Shows the dependencies and nature of distribution of internal stresses in thermally activated stretching processing of long parts. The factors influencing the distribution of internal stresses in thermally activated stretching treatment, namely temperature, strain rate. Also a comparative analysis of the dependence of the residual stresses distribution from the elongation of long non-rigid parts, taking into account the characteristic changes of the residual stresses distribution on the parameters of temperature and strain rate. Identified thermally activated stretching method of processing in which the work piece gets the specified physical and mechanical properties and is equal to stress state of the material in the cross section to the length of the part.