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Study on Key Technology for CAD of Lost Foam Mould

Author: OuYangShuZuo
Tutor: WuZhiChao
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Lost Foam Mould CAD Deformation Surface Treatment Teflon
CLC: TP391.72
Type: Master's thesis
Year: 2010
Downloads: 35
Quote: 1
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Abstract


Because of its advantages of precision forming and leaving out of parting and cores compared with traditional sand casting, lost foam casting (LFC) has been widely applied in the casting process of complex products. LFC puts emphasis on foam model and the model lies in lost foam mould. Currently there are still some problems exist in the lost foam mould technique: mould design, mould deformation, and mould surface treatment. The solution of these problems is important to obtain the foam model well and quickly.With the help of some experiments and Unigraphics NX software, the thesis did research and got important results on three aspects: the optimization of mould design, stressed deformation analysis and improvement of mould, and Teflon surface treatment research.The lost foam mould of a cylinder block was designed with UG/Moldwizard. A new method of mould design based on assembly was proposed to improve the efficiency and achieve rapid modification.The pressure data of foaming under different process parameter was measured through the pressure tests. It shows that model density and foam agent volatilization have an important pact on pressure size, but model thickness doesn’t. The date gives the cylinder selection standard to avoid mould deformation caused by improper cylinders.With the analysis of mould structure by finite element method based on UG/Advanced Simulation, the deformation and intensity of the mould were improved through adding strut bar.The bonding strength and wear resistance of Teflon coating under different conditions were inspected through the sandblasting experiments. The reasonable sandblasting technique and Teflon spraying process were obtained, and service life of coating was improved.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Machine-assisted technology > Machine -aided design (CAD), aided drawing
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