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The propagation and accumulation of dimensional shrinkage for ring-to-ring structure in investment casting

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Abstract

The deformation of wax pattern and the solidification of the metal have the major influences on the final dimensions of casts in investment casting. However, the two main casting process steps and casting geometry affecting the dimensional shrinkage were not quantitatively studied. In this study, the dimensional shrinkage has been investigated with a ring-to-ring cast. The displacement of wax pattern and its corresponding casting are measured by 3D laser scanner, and the inner cavity dimensions of the ceramic shell are measured by industrial computerized tomography (ICT). The external diameter in outer ring is, on average, contracted with 0.849% in wax pattern and 2.559% for casting. A direct linear relationship of dimensions in outer ring is established between the wax patterns with its castings. The quantitative results show that the shrinkage of unconstrained dimensions is dominantly influenced by metal thermal contraction in casting process. The empirical analysis models developed could be employed and analyzed for the impact of casting geometry and process on dimensional changes in investment casting.

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Funding

This work was financially supported by the Major State Basic Research Development Program of China (2016YFB0701405) and National Natural Science Foundation of China (51705314). The authors gratefully acknowledge the financial support from the National Industrial Basis Improvement Project under Project (TC160A310-12-1) and Aeronautical Science Foundation of China (2015ZE57011). The Science and Technology Committee of Shanghai Municipality (Grant No. 16DZ2260602) are gratefully acknowledged.

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Authors and Affiliations

  1. Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, China

    Donghong Wang, Anping Dong, Guoliang Zhu & Da Shu

  2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China

    Donghong Wang, Anping Dong, Guoliang Zhu, Da Shu & Fei Li

  3. Materials Genome Initiative Centre, Shanghai Jiao Tong University, Shanghai, 200240, China

    Donghong Wang & Da Shu

  4. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Anping Dong & Fei Li

Authors
  1. Donghong Wang
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  2. Anping Dong
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  3. Guoliang Zhu
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  4. Da Shu
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  5. Fei Li
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Correspondence to Anping Dong.

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Wang, D., Dong, A., Zhu, G. et al. The propagation and accumulation of dimensional shrinkage for ring-to-ring structure in investment casting. Int J Adv Manuf Technol 96, 623–629 (2018). https://doi.org/10.1007/s00170-018-1631-8

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  • DOI: https://doi.org/10.1007/s00170-018-1631-8

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