Affiliation:
1. De Montfort University Department of Mechanical and Manufacturing Engineering Leicester, UK
Abstract
The use of investment casting to gain functional metal parts from stereolithography (SL) models is well documented. However, despite the thousands of metal castings produced, the original stereolithography build structures that were designed for investment casting have only been partly successful in combating the effects of the thermal expansion SL resins. Investment casting foundries still have to alter their existing techniques and, significantly, are dewaxing shells containing SL models in the flash furnace rather than the steam autoclave. This paper describes how a greater understanding has been established of why SL investment casting patterns are causing the shells to crack. Theoretical and practical stress analysis, utilizing finite element analysis and strain gauge techniques, has given a much clearer picture of the failure modes of the ceramic shells and SL models. This has led to a set of criteria for the design of build structures that allows the successful autoclaving and subsequent casting of stereolithography models. Details of the background research, stress analysis and design criteria are presented along with a new design of internal build structure that allows the successful autoclaving and casting of stereolithography models.
Subject
Industrial and Manufacturing Engineering,Mechanical Engineering
Reference7 articles.
1. Jacobs P. F. Stereolithography 1993: Epoxy resins, improved accuracy and investment casting. In Proceedings of 2nd European Conference on Rapid Prototyping and Manufacturing (Ed. Dickens P. M.), Nottingham, England, 15–16 July 1993, pp. 95–113.
2. Jacobs P. F. QuickCastTM 1.1 and rapid tooling. In 4th European Conference on Rapid Prototyping and Manufacturing (Ed. Dickens P. M.). Belgirate, Italy, 13–15 June 1995, pp. 1–27.
3. Wimpenny D. Rapid prototyping: An overview of the technology applied to investment casting. In Proceedings of the 8th World Conference on Investment Casting, June 1993, pp. 23–30 (BICTA).
4. Cordes J. 3D Systems QuickCast™: How to assure success. 3D Systems Document, 1993, Valencia, California.
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