Rapid casting of hollow turbine blades using integral ceramic moulds

Wu, Haowei; Li, D; Tang, Yiping; Guo, Ningning; Cui, Feilun; Sun, Bo

doi:10.1243/09544054jem1366

Cited by 14 publications

(13 citation statements)

References 23 publications

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“…Research conducted in 2008 by Wu et al [ 77 ] provides an example of a novel RC method to manufacture a complex shaped hollow turbine blade. This novel method includes manufacturing with following steps: 1.…”

Section: Description Of the Properties Of Printed Parts That Are Imentioning

confidence: 99%

Application of Stereolithography Based 3D Printing Technology in Investment Casting

2020

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Advanced methods for manufacturing high quality parts should be used to ensure the production of competitive products for the world market. Investment casting (IC) is a process where a wax pattern is used as a sacrificial pattern to manufacture high precision casting of solid metal parts. Rapid casting is in turn, a technique that eases the IC process by combining additive manufacturing (AM) technologies with IC. The use of AM technologies to create patterns for new industrial products is a unique opportunity to develop cost-effective methods for producing investment casting parts in a timely manner. Particularly, stereolithography (SLA) based AM is of interest due to its high dimensional accuracy and the smooth surface quality of the printed parts. From the first appearance of commercially available SLA printers in the market, it took a few decades until desktop SLA printers became available to consumers at a reasonable price. Therefore, the aim of this review paper is to analyze the state-of-the-art and applicability of SLA based 3D printing technology in IC manufacturing, as SLA based AM technologies have been gaining enormous popularity in recent times. Other AM techniques in IC are also reviewed for comparison. Moreover, the SLA process parameters, material properties, and current issues are discussed.

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Section: Description Of the Properties Of Printed Parts That Are Imentioning

confidence: 99%

Application of Stereolithography Based 3D Printing Technology in Investment Casting

2020

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“…13 The near-net shaping of the ceramic part during freeze drying is realized because the water's surface tension is eliminated. 14 It is a promising new technique to combine the advantages of gelcasting and freeze drying to prepare complex-shaped or high-strength ceramic green parts with low shrinkage, such as the integral ceramic mold of hollow turbine blade, 14,15 porous ceramics with aligned pore structures. 2,13,16 For the integral ceramic mold, it has complex-shaped cores and shell.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Cracks During the Freeze Drying of Gelcast Ceramic Parts

et al. 2015

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The near‐net shaping of gelcast ceramic parts can be achieved using freeze‐drying technology. It was discovered that the cracks probably occurred inside the part during freeze drying due to the formation of liquid water. To explain the formation mechanism of cracks, the electrical resistance method was employed to measure the part's eutectic temperature which can be used to determine the freezing and melting state of the part. Affecting factors on cracking were investigated by testing the temperature and water loss of the part during the drying stage, and the cracks inside the part were detected through computed tomography (CT). It was found that when the temperature of the part was higher than the eutectic temperature, the ice crystals at the sublimation front would melt, resulting in the formation of wet green body. The cracks will occur inside the part because great capillary forces are formed in the wet green body. Cracks could be controlled through reducing heat supply by lowing shelf temperature, decreasing pressure of the drying chamber or lowering the dried layer resistance against water vapor by improving the freezing temperature or reducing the solid loading of the part.

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“…1,2 With the development of aviation, shipbuilding industry and so on, the products of investment casting are gaining large-scale, complex-shaped and thin-walled features, and the required precision in the final casting of the geometry is also growing. All of these make it difficult to determine tooling dimensions.…”

Section: Introductionmentioning

confidence: 99%

Dimensional variation stream modeling of investment casting process based on state space method

Liu

Jin

Lai

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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Investment casting process produces high-precision castings, but there is a constant demand for improving the process capabilities, including dimensional accuracy and consistency. In this article, a state space modeling approach of investment casting process for dimensional variation is developed. This research focuses on the linear dimensional change (expansion or shrinkage) in the investment casting process. The generation, propagation and accumulation of the dimensional variation in the investment casting process are interpreted. In order to develop a mathematical model to describe the procedure above, a notion, the dimensional variation stream, is employed, and several key concepts, such as dimensional change rate, state vector and process parameter variation vector, are defined. The inherent relationships among these components are uncovered and finally bring about a State Space Model that describes the dimensional variation stream in the whole investment casting process. In the end, the usages of the developed model are illustrated and summarized via studying a case.

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Rapid casting of hollow turbine blades using integral ceramic moulds

Cited by 14 publications

References 23 publications

Application of Stereolithography Based 3D Printing Technology in Investment Casting

Application of Stereolithography Based 3D Printing Technology in Investment Casting

Formation Mechanism of Cracks During the Freeze Drying of Gelcast Ceramic Parts

Dimensional variation stream modeling of investment casting process based on state space method

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