Production Techniques 2 Shell, investment and die casting processes

Beeley, Peter

doi:10.1016/b978-075064567-6/50012-1

Cited by 13 publications

(17 citation statements)

References 7 publications

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“…A pattern of the investment casting component is prepared by injecting molten wax into a metal mold. The wax used for investment casting is usually mixed with complex compounds, e.g., natural hydrocarbon wax, natural ester wax, synthetic wax, natural and synthetic resin, organic filler material, and water (15). Careful control of the components can improve the wax properties such as melting point, hardness, viscosity, and thermal expansion/contraction and is important for the final quality of the casting products.…”

Section: Wax Patternmentioning

confidence: 99%

“…The crucible materials are normally made of magnesia, alumina, and zirconia. For jewelry and dental castings, which require frequent and rapid melting of small quantities, hand pour furnaces with fixed integral crucible are used (15). For applications where close control of the grain is required, e.g., columnar (directionally solidified) or single-crystal casting, the Bridgman furnace is used to allow the metal to solidify from bottom to top (for details see Section 5.05.1.2).…”

Section: Castingmentioning

confidence: 99%

“…The wax cluster is dipped into slurry mixed with fine refractory powder and binder liquid to give a smooth surface finish and reproduce fine details of the pattern. Common materials used for slurry refractories are silica, zircon, aluminum silicate, and alumina, the typical properties of which are listed in Table 1 (14,15). The binders used to hold the refractory material in place include colloidal silica (water based, also known as silica sol, set by drying), hydrolyzed ethyl silicate (alcohol based and chemically set), sodium silicate, and hybrid binders ( Table 2) (14).…”

Section: Ceramic Moldmentioning

confidence: 99%

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Single-Crystal Casting/Directional Solidification

Dong

Dai

2014

Comprehensive Materials Processing

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Section: Wax Patternmentioning

confidence: 99%

Section: Castingmentioning

confidence: 99%

Section: Ceramic Moldmentioning

confidence: 99%

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Single-Crystal Casting/Directional Solidification

Dong

Dai

2014

Comprehensive Materials Processing

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“…It is the key to manufacturing technology that preserves modern requirement of many critical applications [2]. IC benefits in providing an economical means of mass production components with complex geometrical features such as thin walls, undercut contours and inaccessible spaces which are difficult or impossible to be produced by other fabrication methods [3], [4]. The development of aerospace and subsequently engineering components since the advent of Second World War have made investment casting process is the most versatile modern casting method [5].…”

Section: Introductionmentioning

confidence: 99%

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

Nanda

Ali

Idris

et al. 2018

International Journal on Advanced Science, Engineering and Information Technology

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Investment casting process (IC) plays a major role in the modern manufacturing process in providing an economical means of mass production components with intricate shape and complex geometry as demand in various crucial applications including aerospace, automotive, military, biomedical and others. This casting technique, develop shell mould fabrication by coating the required pattern with a refractory mixture which offers the complex geometrical shape and sizes parts to be cast. However, the modern IC approach in shell mould production suffers from zircon's cost and supply instability as it is the main material to be used. Zircon uses as refractory filler for slurry production, and also in the form of sand used as stucco particles, is favoured by the investment casting facilities and industries as it exhibits the most versatile properties such as low thermal expansion and low reactivity to the metal to be cast. During the period of zircon supply shortage, many facilities introduce several alternatives. Currently, the step taken to reduce the cost of primary slurry material is by using some alternate refractory material like, alumina, silica, to be used with zircon for shell mould production. In relation to that, several researches continue to search for alternatives approach for shell mould materials. This research introduces the alternative method in fabricating investment casting shell mould as recognized from investment casting industry located in Sungai Puar of Bukittingi Padang Indonesia. This industry employs several local resources to fabricate the shell mould. These materials consist of rice husk ash (RHA), and two types of bentonite clays. The bentonite clays were obtained nearly from Kota Payakumbuh in the western provinces. However, this industry suffers from weak shell mould strength and need to be investigated and consulted. In this paper, the investigation on shell mould strength made from rice husk ash (RHA), and bentonite clays were conducted. The strength was measured by its modulus of rupture (MOR) performed in 3 points flexural bending test. The green and fired shell mould strength was determined from five type of slurry composition. The results revealed that the highest green and fired strength obtained were 0.157 MPa and 0.361 MPa from shell mould sample C of RHA (46%) and bentonite (54%) of its composition.

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“…3 Wax model used is coated with refractory sand to make moulds, which is de-waxed, to increase thermal strength, and afterwards, molten metal is poured. 4 Complex shapes such as turbine blades, airplane parts and modern weapons are easy to produce with this route. Furthermore, the route offers benefits such as reliability, amortization lower tooling, safe for environment and design, and casting versatility.…”

Section: Introductionmentioning

confidence: 99%

Precision investment casting: A state of art review and future trends

Singh

2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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Investment casting process is known to its capability of producing clear net shape, high-dimensional accuracy and intricate design. Consistent research effort has been made by various researchers with an objective to explore the world of investment casting. Literature review revealed the effect of processing parameters on output parameters of cast specimen. This article highlights the advancements made and proposed at each step of investment casting and its hybridization with other process. Besides, investment casting has always been known to manufacture parts such as weapons, jewellery item, idols and statues of god and goddess since 3000 BC; this article reviews the present applications and trends in combination of rapid prototyping technique as integrated investment casting to serve in medical science. Advancements in shell moulding with incorporation of fibre and polymer, development of alternative feedstock filament to fused deposition modelling are duly discussed. The aim of this review article is to present state of art review of investment casting since 3200 BC. This article is organized as follows: in section ‘Introduction’, introduction to investment casting steps is given along with researches undertaken at each step; in section ‘Rapid prototyping technique’, background is given on the concept of rapid prototyping technique by examining the various approaches taken in the literature for defining rapid prototyping technique; section ‘Biomedical applications of RPT’ presents the medicine or biomedical applications of investment casting and rapid prototyping technique; section ‘Future trends’ provides some perspectives on future research and section ‘Conclusion’ closes the article by offering conclusions.

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Production Techniques 2 Shell, investment and die casting processes

Cited by 13 publications

References 7 publications

Single-Crystal Casting/Directional Solidification

Single-Crystal Casting/Directional Solidification

Shell Mould Strength of Rice Husk Ash (RHA) and Bentonite Clays in Investment Casting

Precision investment casting: A state of art review and future trends

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