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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48366 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Tavakkoli, Rouhollah
- Abstract:
- More than 70 weight percentage of using parts in diverse industries (such as military, civil, automobile productions and etc.) are produceed by the casting processes. For each one of the casting procceses, mold cavity is requisite for arrived molten metal in the mold cavity to get eventuated as a solidified part. Based on mold ilk, if the mold is permanent, the cast part must be capable to be remoeved from the the mold inside. For the non-permanent mold (asssuming multi-piece and non-monolithic), if the model requires to be removed from the mold inside after molding and before casting, only model (no cast part) has to be moldable (why for removing the solidified cast part from the non-permanent mold inside, the mold is collapsed, so there is no need to the cast part moldability). To obviate the problem of lacking of model moldability satisfaction from non-permanent mold, using the multi-piece model can facilitate the problem, but for the permanent mold the cast part must be moldable. Mold elements must also freely be removed not only respect to eachother, but also respect to the cast part without any involvement. For investigation of this capability different geometrical methods based on parts’ convex hull have been developed. Nonetheless, no one has submitted any adequate and essential condition. In this project using geometrical methods have been studied to draw out adequate and essential condition which insures to have the cast part moldability. Then, a geometrical directional convexity based method is submitted how by its using, geometrical algohritm has been developed as a just adequate (inessential) condition to insure moldability. Furthermore, for the cast parts which may be moldable and might not have directional convexity, an analysis dependent on surface visibility is used to study the moldability. The analysis is subjected to the part’s external surface discretization into disjointed boundaries. In enjambment, a phase field based method is posed to design optimal parting surface and optimal geometrical change between the first cast part shape and the mold elements. In this method, parting surface minimization, part moldability assurance and mold elements free moveability are studied. Then, a numeric method is used to solve the phase field based method model. Finally, the method’s success is endorsed by 2-dimansinal numerical instance
- Keywords:
- Phase Field Model ; Casting ; Cast Part Geometry ; Convexity ; Directioal Convexity ; Surface Visibility ; Parting Surface ; Moldability
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