The deformation of wax patterns and castings in investment casting technology

• Autorzy: Herman A. , Česal M. , Mikeš P.
• Języki publikacji: EN

Abstrakty

EN

The dimensional accuracy of the final casting of Inconel alloy 738 LC is affected by many aspects. One of them is the choice of method and time of cooling wax model for precision investment casting. The main objective was to study the initial deformation of the complex shape of the casting of the rotor blades. Various approaches have been tested for cooling wax pattern. When wax models are cooling on the air, without clamping in jig for cooling, deviations from the ideal shape of the casting are very noticeable (up to 8 mm) and most are in extreme positions of the model. When blade is cooled in fixing jig in water environment, the resulting deviations compared with cooling in air are significantly larger, sometimes up to 10 mm. This itself does not mean that the final shape of the casting is dimensionally more accurate with usage of wax models, which have deviations from the ideal position smaller. Another deformation occurs when shell mould is produced around wax pattern and furthermore deformations emerge while casting of blade is cooling. This paper demonstrates first steps in describing complex process of deformations of Inconel alloy blades produced with investment casting technology by comparing results from thermal imagery, simulations in foundry simulation software ProCAST 2010 and measurements from CNC scanning system Carl Zeiss MC 850. Conclusions are so far not groundbreaking, but it seems deformations of wax pattern and deformations of castings do in some cases cancel each other by having opposite directions. Describing entirely whole process of deformations will help increase precision of blade castings so that models at the beginning and blades in the end are the same.

Słowa kluczowe

EN

information technology; foundry industry; innovative foundry technologies; innovative foundry material; investment casting; wax patterns

PL

technologia informatyczna; przemysł odlewniczy; innowacyjne technologie odlewnicze; innowacyjne materiały odlewnicze; odlewanie precyzyjne; model odlewniczy

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2012
• Tom: Vol. 12, iss. 1
• Strony: 37--42
• Opis fizyczny: Bibliogr. 3 poz., rys., wykr.

Twórcy

autor

Herman A.

autor

Česal M.

autor

Mikeš P.

• Department of Manufacturing technology, Czech technical University in Prague, faculty of Mechanical engineering, Technicka 4, 16607 Prague 6, Czech Republic,

Bibliografia

• [1] Kosour, V., Horáček, M. & Vaščák, T. (2011). Wax injection simulation. In Proceedings 51. International Foundry Conference (1-9). Porotorž Ljubljana: Fleks, d.o. o.
• [2] Gebelin, J. C., Jolly, M. R. & Cendrowicz, A. M. (2004). Simulation of Die Filling for the Wax Injection Process: Part I. Models for Material Behavior. Metallurgical and materials transactions B, 35B.
• [3] Bonilla, W., Masood, S. H. & Iovenitti, P. (2001). An Investigation of Wax Patterns for Accuracy Improvement in Investment Cast Parts. Int J Adv Manuf Technology. 18, 348-356.