Improvement of upsetting process of four-beam workpieces based on computerized and physical modeling

Abstract

The method of upsetting of large ingots has been investigated in this work. The proposed method consists in upsetting of profiled workpieces with concave faces. An angle of the concave faces was 150°. A relative depth of the concave faces has been varied in range 15%…25% from workpiece's diameter. Strains effective and mean stresses in the longitudinal cross-section of the workpiece with concave faces after upsetting have been determined by FEM. A value of compressive stresses has been determined based on a parameter of the stress state. FEM allowed to find what a rational depth of the concave faces should be, which has to be 15 % from workpiece's diameter. Maximum closing of the internal defect take place for this depth of the concave faces. Results of the FEM have been tested by experimental investigations. It has been established that upsetting of the four-beam workpieces improved a quality of the massive parts.

Designing a kinematic module with rounding to model the processes of combined radial-longitudinal extrusion involving a tool whose configuration is complex

“…In this context, the priorities are determined by the search, development, and implementation of state-of-the-art science-intensive technologies, as opposed to the classic techniques of part shape formation by removing chips. In modern realities, the variety of methods for processing metals by pressure (PMP) renders relevance to the task of choosing the most rational and economically one defined in [1][2][3][4][5][6][7][8][9]. Examples of successful solutions of specific practical issues [2][3][4][5] are inextricably linked with the development and constant improvement of finite-element modeling methods, statistical data processing [4][5][6].…”

“…In modern realities, the variety of methods for processing metals by pressure (PMP) renders relevance to the task of choosing the most rational and economically one defined in [1][2][3][4][5][6][7][8][9]. Examples of successful solutions of specific practical issues [2][3][4][5] are inextricably linked with the development and constant improvement of finite-element modeling methods, statistical data processing [4][5][6]. That makes it possible to expand the boundaries of applying the selected deformation technique by determining the optimal manufacturing modes, tool configuration, as well as the conditions that provide for the quality of resulting articles [3,7].…”

“…Examples of successful solutions of specific practical issues [2][3][4][5] are inextricably linked with the development and constant improvement of finite-element modeling methods, statistical data processing [4][5][6]. That makes it possible to expand the boundaries of applying the selected deformation technique by determining the optimal manufacturing modes, tool configuration, as well as the conditions that provide for the quality of resulting articles [3,7]. Theoretical advancements in the research of a wide range of processes relate to the development and improvement of methods for describing the shape of bodies, searching for criteria and procedures for simplifying the assessment of force regimes, and the shape formation of semi-finished articles [2,6,7].…”

Research of the synthesis of radiant intensity indicatrix of multicomponent beam diode module

“…Beam-signal and other devices of active action of the IR range have significant operational advantages at the working lengths of the EMW, which correspond to the "windows" of the transparency of the atmosphere in the middle range of the IR spectrum: (3.3 -4.2) μm, (4.5 -5. 1) μm, (8)(9)(10)(11)(12)(13) μm. Modern technological advances in the production of ultra-bright p-n-emitters in these parts of the spectrum require further study of the mechanisms of formation of the basic physical and technical characteristics of multicomponent beam-diode sources of directional action.…”

“…A simplified parametric model is selected for the empirically obtained data set. Such analytical models are the basis for the classification of the main types of LIC for sources of any radiation mechanism [7,8,9]. Together with the idealized diagram f(θ)=cos -3 •θ (θ -a polar distance) there are 8 such types.…”