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Inversion of Thermal Contact Resistance in Injection Molding

Author: LiTie
Tutor: LiXingSi
School: Dalian University of Technology
Course: Computational Mechanics
Keywords: Injection molding Inverse problem Thermal resistance Bregman regularization Homotopy method
CLC: O551.3
Type: Master's thesis
Year: 2008
Downloads: 83
Quote: 1
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Abstract


In the field of injection molding process parameters from the molding process to control the final quality of the product has become a very important tool. In injection molding, cooling plays a vital role in the process of product quality, cost, cycle. Temperature is one of the most important parameters in the injection molding process, unreasonable temperature parameters will affect the plastic parts of the molding cycle and the quality of the products. In the past, heat transfer analysis, people tend to believe that the contact between the mold and the products. However, this is not consistent with the actual situation, ignore the incomplete contact phenomena between the mold and the products will likely result in a certain degree of error heat transfer analysis. Is difficult to directly measure the thermal contact resistance between the mold and the products get papers inverse problems and numerical simulation techniques combined to establish the the injection cooling process inversion mathematical model of the thermal contact resistance, and Bregman regularization method for solving. Numerical examples show, the inverted thermal contact resistance error is small, consistent with the real value of this study is to determine the thermal contact resistance of the injection molding process provides a practical calculation method. The thesis is organized as follows: Chapter 1 is an introduction. Brief introduction to the background and significance of the topic, an overview of the status of development and its commercial application software CAE technology, and introduced the general concept of the inverse problem, and summarized the main method for solving the inverse problem, the last of this article The main work. The second chapter first introduces the development of heat transfer in the field of injection molding, numerical simulation technology is applied to the injection molding field of heat transfer, the mathematical model of the cooling process, and given boundary conditions. Finally, a brief introduction of the finite element method for solving temperature field during cooling. The third chapter analyzes the factors that affect the temperature change in the cooling process, clearly define the problem to be solved, and proposed mathematical model of the the injection cooling process of thermal contact resistance inversion. Chapter Bregman regularization method of inverse problem solution proposed for solving the thermal contact resistance. In order to eliminate the ill-posedness of the inverse problem, regularization method Bregman correction model. As the regularization Functional to the different forms of the D-function corresponding to the selection in the sense of different distances and the Regular Solution closest that a solution, and introducing homotopy method, in order to increase the range of the convergence of the solving. Finally, the the injection cooling process of thermal contact resistance inversion solving algorithms and numerical examples. The fifth chapter is a summary of the full text, and a few can refer to this article further expand the direction of work. This paper studies the major projects of the National Natural Science Foundation of China (10590354) and the National Natural Science Foundation of China (10572031), funded

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CLC: > Mathematical sciences and chemical > Physics > Thermal and material kinetic theory > Thermal > Thermal properties of matter
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