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Simulation Study on the Preparation Method of the Large-sized Ceramic Structure

Author: LiZuo
Tutor: ZhaoBo
School: Henan Polytechnic University
Course: Mechanical Manufacturing and Automation
Keywords: engineer ceramic cylinder cold isostic pressing pressureless sintering finite element method
CLC: TQ174.1
Type: Master's thesis
Year: 2007
Downloads: 30
Quote: 0
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Abstract


Nowadays the ceramic material is widely used in the airspace, petrochemical engineering, instruments and meters, mechanical manufacture and nucleus industry areas and so on. On the base of the study and development of the related technologies, the engineer ceramic has been payed more and more attention, especially to the manufacture and use of the large scale ceramic workpiece. Compared with the metal cylinder, the engineer ceramic cylinder has the higher rate performance of life and cost. But for the expensive primary material and low rate of finished products made by the imperfect prepare technique, the manufacture cost of the ceramic cylinder can’t be descreased, which seriously prevents its promotion and application.Based on the element theory of large deformation and elasto-plasticity finite, the CIP process of ceramic cylinder was studied through the analyzed results offered by the finite element software (Ansys). Overcoming the designing defects of the material storage of the FE software, the author defined some critical factors like the material model, the boudary conditions, friction and convergence criterion etc; the simulation results showed the status of deformation, stress and strain, and gave the reasons of flaws appeared, then you can improve the process immediately and design the final perfect shape of the die. And study results are helped to reduce the allowance for finish, get compact and uniform body.And the author also tempted to simulate the sintering process and the temperature field of the roller hearth kiln. Through the analyzing of the sintering character and the driving force of power material, the author made sure the feasibility of pressureless sintering, then built the sintering model by defining the shrink driving force, the shrink strain and boundary conditions, compared the experiment results with the simulation results at the end. The results showed that: the changes of their relative density mached each other and the relative error of outline dimensions were below 2%. Through the simulation of the pressure and velocity nephograms in the kiln, the author studied the kiln temperature field. And all the above study is useful for controlling the process and upgrading the products’quality.Finally the author also made the preparemental experiment of the ceramic cylinder, and compared the experiment results with the simulation results.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Basic theory
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