Study on technical parameter influenced temperature field for dieless forming
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Temperature field of stainless steel for dieless forming is studied by using FEM in this paper.Different technical parameter affe cting temperature field is analysed,such as velocity of heating and cooling device,distance between heating an d cooling device,and deformed degre e.The results of analysis represent regular pattern during the process o f different technical parameter inf luencing temperature field.Keywords:
Maximum temperature
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This paper is devoted to the development of technological process of production of magnesium alloy tubes by laser dieless drawing process. The purpose of the paper is the development and verification of the FEM code for simulation of LDD process and the study of main regularities of this process for magnesium alloy tubes. The problems of forecasting the geometric dimensions of the tube and the possibility of the crack of the material were considered.. The developed FEM code takes into account the three-dimensional deformation of the material, thermal processes, laser heating, the mechanical properties of the material and process parameters. Calibration of the model included the definition of the absorption coefficient, which determines the efficiency of laser heating. For this purpose the experimental analysis of the temperature distribution during the process was made. In laboratory conditions the experiment of laser dieless drawing of tube from AZ31 alloy was performed with the initial outside diameter of 5 mm and a wall thickness of 1 mm. In the experiment the tube surface was covered with a graphite paint to increase the absorption coefficient. The value of absorption coefficient was determined by the inverse analysis and was equal to 0.12. The calculated results were used for producing tube in laboratory. As a result, a good correspondence of geometrical dimensions of the final tube with the calculated values was achieved.
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To control temperature field changes and surface microstructure transformation of intermediate billet of SUF(Surface layers with Ultra Fine grains) steel,using Abaqus simulation software,FEM model of cooling process for Q345A intermediate billet in two stages of rolling was built,and the evolution of temperature field in a rapid cooling and tempering process was simulated.The distribution of transient temperature field and the temperature-time curve of billet surface and center was obtained.The simulated results are in good accordance with practical test results.Besides,the effects of water cooling time on temperature field of billet cross-section were studied.The results can offer a theoretical foundation for investigating the depth of ultra-fine layerand the grain refinement mechanism.
Cooling curve
Tempering
Continuous cooling transformation
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A thermoelectric coupling finite element model was built to simulate temperature field distribution in Q235 steel flashing process. During the calculation, the temperature of the material phase changes and the thermophysical properties are taken into account to draw the conclusion of the temperature field over time during the welding process, as well as the temperature field distribution characteristics of the weldment axially and radially. The temperature field was verified by a real-time infrared thermoscope experience. The results show that the simulated result and the measured values are identical.
Axial symmetry
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The first pass hot rolling process of thin slab was studied with the aid of two dimensional elastic-plastic and thermal-mechanical coupled FEM using commercial software Marc.The distribution and change of temperature field in rolling process were analysed.The results show contact heat conduction and deformation heat are the main factors that influence temperature change and their synthetic functions determine the workpiece temperature changes during deformation.There is obvious temperature gradient from surface to centre of the workpiece within a certain depth.The workpiece temperature almost remains constant beyond this critical depth.The result serves as reference to the industrial production.
Slab
Temperature Gradient
Thermal contact
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With finite element software Abaqus, a coupled thermal mechanical simulation of hot stamping process of U-Channel part using high strength steel was performed. Through the analysis of the temperature field distribution on the die surface, the influence of contact state between die and blank on the temperature field distribution was discussed. With temperature history curve of a selected node on die corner, the heat flow on two contact boundaries (die surface and cooling water channel surface) was discussed and its effects rules on the die temperature were given.
Blank
Hot stamping
Stamping
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The thermal field of welding process describled by moving double ellipsoid heat source was numerically simulated by finite element method(FEM), and the influences of welding parameters including plate thickness, heat input and preheating temperature on cooling rate(defined by t8/5) of heat affected zone(HAZ) were investigated based on analysis of heat transfer characteristics. The critical condition for defining intermediate plate thickness was determined by comparison between FEM results and calculation resulting from conventional heat transfer theory, and the prediction equations of t8/5of intermediate thick plate were established based on the regression analysis of FEM results using polynomial method. Moreover, the feasible range of preheating temperature to this equation was discussed. The welding experiments by the same parameters are applied to verify the effectiveness of the prediction equations from FEM. The compared results of thermal cycle and microstructure between experiment and FEM are in good agreement.
Ellipsoid
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Microforming with laser-assisted heating method is appliable for hardto-deform material.Through the selected laser heating,the resistance to deformation of the material can be reduced and the flow uniformity and formability can be improved.As the temperature is one of the most important factor affecting the product quality.In this paper,several numerical simulations were conducted using FEM software to obtain 3d temperature distribution.The simulation results are in good agreement with experimental results,which shows that the FEA can be used to simulate the temperature field distribution.Moreover,a double side heating method has been presented which can make the temperature distribution more uniform,and the relevant optimized laser parameters are given.
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The mechanical properties of small H-beam is dependent on the temperature of hot rolling process,especially the temperature of final hot rolling.Numerical simulation of the temperature field of hot rolling process was made by means of the software of Finite element analysis based on the measured temperature result.The error of actual measuring temperature of several rolling stages and the results of finite element analysis is very small.The temperature values of several rolling stages and difference of inner and outer of H-beam were gained.The analysis result is important for establishing the heating temperature and cooling parameter and hot rolling process parameter.
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Based on the theoretical analysis of heat transfer of billet copper-pipe, the rule of heat transfer in the billet and copper-pipe has been explored. The copper-Pipes temperature field and heat stress field have been studied systematically with FEM. The copper-pipe temperature field and heat stress field have been analyzed under different conditions of the casting speed, the cooling strength and the designed wimble. A theory has been put forward on which the design of beforehand-stress crystal-implement is based, and which is applied to guide for practice.
Stress field
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Inconel
Atmospheric temperature range
Transient (computer programming)
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