The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
A. I. Traino - One of the best experts on this subject based on the ideXlab platform.
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Simulation of cold rolling and skin rolling of strips in the Deformation Zone consisting only of a forward slip Zone
Russian Metallurgy, 2020Co-Authors: E. A. Garber, D. L. Shalaevskii, A. I. TrainoAbstract:The conditions of the appearance of an unusual Deformation Zone consisting only of a forward slip Zone during cold rolling and skin rolling are considered. The energy-force and structure parameters of metal Deformation in such Deformation Zones are simulated. In this case, substantial energy saving is achieved; however, they can only be actualized in a real continuous mill by increasing the forward tension to the level that sharply increases the strip break probability. The process with such a Deformation Zone can be performed on a pinch-pass mill at an acceptable level of forward tension (up to 35% of the yield strength), and about 50% electric energy can be saved in this case.
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Effect of the Cold-Rolling Parameters and the Yield Strength of the Strip Material on the Friction Stresses in a Deformation Zone
Russian Metallurgy, 2020Co-Authors: E. A. Garber, I. V. Yagudin, V. V. Ermilov, A. I. TrainoAbstract:The reliability of the methods of determining the friction coefficient is analyzed, since the friction stresses in the Deformation Zone during cold rolling significantly affect the quality of cold-rolled sheets and the energy consumption. The well-known experimental data and empirical dependences are shown to contradict each other, and the statistical assurance of these dependences is absent. A database on the interrelated technological and energy-force parameters of a five-stand cold-rolling mill, which includes a wide range of steel grades and strip sizes and shapes, is analyzed. Regression analysis is used to obtain a statistically reliable regression dependence of the friction coefficient in the Deformation Zone on the most significant technological parameters. The application of this dependence decreases the error of energy-force calculations by more than two times.
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Procedure and algorithms for the energy-force calculation of cold rolling allowing for the number of neutral sections in the Deformation Zone
Russian Metallurgy, 2008Co-Authors: Eric A.e. Garber, I. A. Kozhevnikova, D. L. Shalaevskii, A. I. TrainoAbstract:A procedure and algorithms are described for the calculation of the rolling power and the main-drive engine power and torque of a working stand in a cold-rolling mill with regard for the number of neutral sections in the Deformation Zone, including the case of two neutral sections in the Deformation Zone. This work is a continuation of our earlier work, where we were the first to consider a Deformation Zone with two neutral sections and proposed a procedure for the calculation of the contact stresses and rolling forces in it. Taking into account the second neutral section is shown to decrease the engine power calculation error by a factor of 4.5–6.5 (on average from 25 to 4%), which allows one not to use too high safety factors when choosing the power rating of the main drive in a cold-rolling mill.
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simulation of the state of stress in a strip in a Deformation Zone with two neutral sections during cold rolling
Russian Metallurgy, 2007Co-Authors: E. A. Garber, I. A. Kozhevnikova, D. L. Shalaevskii, A. I. TrainoAbstract:It is found that a Deformation Zone with two neutral sections can exist in a strip during cold rolling in certain working stands in continuous rolling mills. A second neutral section appears in the region of elastic recovery of part of the strip thickness at the end of the rolls. A reliable procedure has been developed to identify the type of Deformation Zone; it can determine the number of neutral sections in the Deformation Zone of each working stand in a rolling mill. A method for the calculation of the contact stresses, forward-creep coefficient, and rolling force in the Deformation Zone with two neutral sections is described. The application of this method decreases the error of force calculation for rolling mills.
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State of stress in the Deformation Zone during rolling of high-strength plate steel
Russian Metallurgy, 2007Co-Authors: E. A. Garber, I. A. Kozhevnikova, A. A. Zavrazhnov, A. I. TrainoAbstract:A new mathematical model is developed for the state of stress in the Deformation Zone for plate rolling, including rolling under controlled conditions at a low temperature in the last passes. The stick Zone during plate rolling is shown to account for 88–99% of the Deformation Zone, and the fraction of elastic regions in the Deformation Zone in the last passes at low temperatures can reach 12%. When the stick Zone and elastic regions of the Deformation Zone are taken into account, the roll-force calculation error is less than 5–6.5%. The model developed can be used to optimize plate-rolling conditions, including the conditions of integrated Deformation-thermal production.
G Gottstein - One of the best experts on this subject based on the ideXlab platform.
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modeling of texture evolution in the Deformation Zone of second phase particles
Acta Materialia, 2009Co-Authors: C Schafer, J Song, G GottsteinAbstract:Cast aluminum alloys usually contain coarse constituents which are likely to serve as potential nucleation sites during recrystallization. In the course of Deformation a special Zone develops around such non-deformable particles, which is characterized by a high local strain and high misorientation gradient. This makes them preferred nucleation sites for recrystallization during a subsequent heat treatment. The orientations of such nucleation sites are of importance for the recrystallization textures. The aim of this study was to investigate the evolution of the microtexture within the Deformation Zone. For plane strain compression the strain distribution around particles was modeled by means of the finite element method (FEM). For spherical and cuboidal particles the local displacement gradients were used to compute the Deformation texture by a Taylor type model. The predicted textures were compared to published experimental data.
Hui Lin Yang - One of the best experts on this subject based on the ideXlab platform.
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A New Stress Mathematical Model of Deformation Zone while Straightening Thin-Walled Tube
Advanced Materials Research, 2020Co-Authors: Zi Qian Zhang, Hui Lin YangAbstract:As there was no precise theoretical model for predicting the stress of Deformation Zone while straightening thin-walled tube, some technological parameters depended mostly on the experience of workers and on the results of trials, therefore by means of the membrane shell theory the equilibrium differential equations of stress is obtained firstly, then we analyze the strain of Deformation Zone, finally lead to a new theoretical model for predicting the stress in the elastic and plastic Zone. Subsequently the simulated experiments have been done, the results show that the theoretical calculations coincide well with the simulated results, the errors are within 1％of the calculations, it is testified that the model is correct and efficient for the thin-walled tube straightening.
W.y.d. Yuen - One of the best experts on this subject based on the ideXlab platform.
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Measurements of velocity distributions in the Deformation Zone in cold rolling by a scanning LDV
Optics and Lasers in Engineering, 2020Co-Authors: E.b. Li, Anh Kiet Tieu, W.y.d. YuenAbstract:Experimental determination of the velocity distribution in the Deformation Zone is of significant importance to investigate the metal flow in both conventional and asymmetrical rolling processes. In this paper, a scanning laser Doppler velocimetry (LDV) system, designed for measuring the velocity distributions in the Deformation Zone in plate rolling is reported. The LDV used for the rolling process is briefly described and then the scanning mechanism based on beam displacement by a rotating transparent plate is introduced. The relationship among the scanning distance, the beam-cross angle of the LDV system and the rotating angle of the plate is established. The scanning LDV was first tested with a rotating disk and then applied in the rolling process. The test results have demonstrated the feasibility of the scanning LDV.
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application of digital image correlation technique to dynamic measurement of the velocity field in the Deformation Zone in cold rolling
Optics and Lasers in Engineering, 2003Co-Authors: E.b. Li, Anh Kiet Tieu, W.y.d. YuenAbstract:Experimental determination of the velocity distribution in the Deformation Zone is of significant importance to investigate the metal flow in both the conventional and asymmetric rolling processes. In this paper, a whole-field method based on the digital image correlation has been investigated and applied to cold rolling. The system reported in this paper can dynamically measure the velocity distribution in the Deformation Zone. Various rolling parameters have been obtained from the recorded images, including the neutral point location and neutral angle, forward and backward slips, the length of the contact arc, etc. Based on these parameters, the coefficient of friction can also be obtained. The principle of operation and a description of the system are given. Rolling tests carried out on an experimental rolling mill are described and results are presented to demonstrate the feasibility of the proposed method.
S.g. Simagina - One of the best experts on this subject based on the ideXlab platform.
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Study and Build-Up of Deformation Zone at Cutting of Thin-Walled Tube by Torsion
Key Engineering Materials, 2017Co-Authors: S.g. SimaginaAbstract:Intensive development of Russian aviation and aerospace industries put an emphasis to the problem of quality of using materials and workpieces and to the value of technical and economical indexes in the context of planned production level [1, 2]. Waste-free technologies are preferred. Cutting by torsion or cutting by shear are preferable technologies if thin-walled tube cutting is the main blanking operation. Build-up of workpiece Deformation Zone plays an important role in the cutting process. Deformation Zone determines stability of details during further processing and exploitation. An extended research was conducted about tube separation process using torsion with an active counterpressure. Some parameters was defined in the result of research, in particular: distribution of Deformation Zone along length and thickness of workpiece, angular deflection and compression force and workpiece heating temperature impact on build-up of whisker disposition in the cut Zone. It allows identifying optimum compression force range and temperature conditions. Compliance with recommended practices allows conducting thin-walled tube separation simultaneously with build-up on the workpieces whisker structure that is fortunate for further pressure treatment and exploitation.