Journal articles: 'Investment casting process'

1

Yang, Guang Yu, Wan Qi Jie, Qi Tang Hao, and Jie Hua Li. "Study on Process of Magnesium Alloy Investment Casting." Materials Science Forum 561-565 (October 2007): 1019–22. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.1019.

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The process of different sorts of magnesium alloys investment casting is studied using a mold materials composed of zircon and colloided silica binder. The investment shell is flushed out employing protective gas mixture of 1% HFC134a and inert gas. The castings with perfect appearance and high metallurgical quality are produced successfully for ZC62 and ME-1magnesium alloy respectively. The mechanical properties of the castings reached the ASTM standard.

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Wu, Lan Ying, Xiao Lian Xiang, and Long You. "Research of Casting Process about Cover and Pump Body of Tonghai Pump and Mechanical Properties Test." Advanced Materials Research 631-632 (January 2013): 676–80. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.676.

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In order to obtain cover and pump body of tin bronze Tonghai pump that is dense and good pressure resistance,the casting mold of the cover of Tonghai pump is metal mold. The casting method of Tonghai pump is vacuum counter-pressure casting.The method of casting pump body of Tonghai pump is vacuum investment casting. This research is about reasonable casting process parameters of vacuum counter-pressure casting and vacuum investment casting.Finally qualified castings of cover and pump body of Tonghai pump can be obtained.

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Gebelin, Jean-Christophe, and Mark R. Jolly. "Modelling of the investment casting process." Journal of Materials Processing Technology 135, no. 2-3 (April 2003): 291–300. http://dx.doi.org/10.1016/s0924-0136(02)00860-9.

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Guler, Kerem Altug, and Mustafa Cigdem. "Casting Quality of Gypsum Bonded Block Investment Casting Moulds." Advanced Materials Research 445 (January 2012): 349–54. http://dx.doi.org/10.4028/www.scientific.net/amr.445.349.

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In this study surface finish and dimensional charactersitics of castings produced with gypsum bonded block investment moulds were investigated. Commercial and laboratory made gypsum bonded investment moulds were used for investment casting mould making. To compare the casting quality of the investment powders, wax patterns for surface roughness specimens and linear dimension measurement specimens were designed and produced with special geometry. Wax trees were assembled with these patterns, cylindrical stainless steel perforated flasks were settled around the trees and gypsum bonded investment slurries were filled into flasks. Conventional tin bronze was subsequently cast into these moulds by vacuum assisted casting process. Afterwards, surface roughnesses of specimens were measured and linear dimensions of wax patterns and cast specimens were compared to determine percantage of dimensional change.

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Shao, Heng, Yan Li, Peng Zhao, Hai Nan, and Qing Yan Xu. "Numerical Simulation of Centrifugal Casting Process of Large Thin-Wall Ti Alloy Casting." Materials Science Forum 850 (March 2016): 469–81. http://dx.doi.org/10.4028/www.scientific.net/msf.850.469.

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Centrifugal pouring is often used in investment casting of large thin-wall Ti castings to promote filling. Shrinkage defects often appear in a Ti casting produced by centrifugal casting. Numerical simulation indicate that shrinkage is caused by these reasons: improper pouring system and thin-wall structure limited feeding of liquid metal from pouring system, and centrifugal force enlarged the shrinkage defects by strengthen feeding of liquid within the casting. Thus centrifugal casting is replaced by gravity casting and a new pouring system is adopted. Obvious shrinkage defects disappear in the new casting process.

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Tamta, Khyati, and D. Benny Karunakar. "Enhancement of Porosity of the Ceramic Shell in Investment Casting Process Using Needle Coke and Camphor." Applied Mechanics and Materials 592-594 (July 2014): 269–75. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.269.

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Investment casting process has been a widely used process for centuries. It is known for its ability to produce components of complex shapes with dimensional accuracy and excellent surface finish. Investment casting has been used to make manufacture weapons, jewellery and art castings during the ancient civilization and today it is used to manufacture engineering components. In Investment casting wax patterns are made by wax injection and then coating of the wax patterns are done by ceramic slurry, made with silica flour and binder. After dewaxing and firing molten metal is poured in the shell and solidified casting can be achieved. Investment casting can be cast any ferrous and non ferrous metal which is difficult in die casting. Finishing operations are negligible and very thin sections as.75mm can also be cast which is not possible in sand casting but there are many challenges in Investment casting. It is relatively slow process because preparation of ceramic shell consumes a lot of time, permeability of shell is very low which causes gas permeability. Incorporation of chills is very difficult. Among all these challenges gas porosity is main problem because of poor permeability, entrapment of gases due to complex geometry of the shell, reuse of scrap metal. In the present work porosity of the shell can be increase by addition of mixture of Camphor and needle coke. After firing of the shell camphor and needle coke will be burnt leaving pores for the escape of entrapped gases. Mechanical properties of the both shell will be compared with each other.

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Zhang, Jie, Kang Wen Li, Hai Wei Ye, Dong Qi Zhang, and Peng Wei Wu. "Numerical Simulation of Solidification Process for Impeller Investment Casting." Applied Mechanics and Materials 80-81 (July 2011): 961–64. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.961.

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Investment casting method can fabricate the impeller slots with non-uniform thickness and distorted surface. The process of investment casting can be simulated by employing ProCAST software. The mesh of the casting was introduced in the article. The influence about the initial temperature of shell on the defects of the casting and the pouring temperature and the pouring speed on the effective stress of the casting was studied in this article. When the initial temperature of shell was 400°C,there was no defect in the casting. The pouring temperature of the casting, will produce a very strong influence on the effective stress. When the pouring temperature in this article was 800°C, the maximum effective stress of the casting was 108MPa.

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Supriadi, Sugeng, Tito W. Sitanggang, Bambang Irawan, Bambang Suharno, Tjokro Prasetyadi, and Fauzan Faturrahman Zulfickry. "Electropolishing of Orthodontic Bracket Produced by Investment Casting Process." Applied Mechanics and Materials 842 (June 2016): 397–401. http://dx.doi.org/10.4028/www.scientific.net/amm.842.397.

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Malocclusion or improper teeth arrangement is the most common problem in the field of orthodontics. If the malocclusion is not corrected, it will promote more serious problems, such as bleeding gums, tooth decay, cavities, difficulty breathing and other problems. Currently, the most common technique used to cure the malocclusion is using treatment of orthodontic brackets. Normally, orthodontic brackets can be produced by machining, metal injection molding and investment casting processes. In the previous research, orthodontic brackets have been successfully produced using investment casting process. The investment casting is selected, since the technology was developed well in Indonesia which is shown by existing number of investment casting industries. However, surface roughness of the bracket produced by investment casting is still high, valued at 0.91 μm. On the other hand, surface roughness of the commercial orthodontic bracket is 0.53 μm. In this current work is focused on surface modification of investment casting brackets by using electropolishing. The best result shows that the surface roughness of cast brackets achieve up to 0.44 μm. It shows that opportunity to fabricate orthodontic brackets domestically is applicable.

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Pattnaik, Sarojrani, D. Benny Karunakar, and P. K. Jha. "Developments in investment casting process—A review." Journal of Materials Processing Technology 212, no. 11 (November 2012): 2332–48. http://dx.doi.org/10.1016/j.jmatprotec.2012.06.003.

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Nawrocki, Jacek, Dariusz Szeliga, Krzysztof Kubiak, Hubert Matysiak, Maciej Motyka, and Waldemar Ziaja. "Influence of Process Parameters on Cooling Conditions in Nickel Base Superalloy Investment Casting." Key Engineering Materials 641 (April 2015): 124–31. http://dx.doi.org/10.4028/www.scientific.net/kem.641.124.

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The published results of the research on crystallization process of nickel base superalloy castings rarely take into account the effect of the wall thickness of the casting. Current study presents a comprehensive assessment of the impact of molten alloy temperature, mould temperature, mould thermal insulation and casting diameter on crystallization process of polycrystalline nickel base superalloy. Research was designed and conducted as an factorial experiment at two levels. Different diameter samples were designed and optimised by the numerical simulation of solidification process using ProCAST software. Inconel 713C nickel based superalloy was cast into alumina-silicate moulds produced by lost wax technique. Casting temperature during solidification was measured using thermocouples installed in sections having a diameter of 10 and 20 mm. Statistical analysis of the influence of the main process parameters and casting diameter on cooling rate, total freezing temperature range and critical temperature range was performed. Cooling rates in the range from 0.21 to 1.24°C/s were obtained. It was found that diameter of the casting, mould temperature and the thermal insulation of the mould had significant effect on the cooling rate.

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Znamenskij, Leonid G., O. V. Ivochkina, and Aleksey S. Varlamov. "Economical Ceramic Molds in Investment Casting." Materials Science Forum 843 (February 2016): 208–12. http://dx.doi.org/10.4028/www.scientific.net/msf.843.208.

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Ceramic corundum molds on hydrolysed ethyl silicate solution which have insufficient inertness to poured alloys are widely used in the production of castings from reactive metals alloys. This is due to the presence of free silica, which is a strong oxidant of such alloy components as aluminium and titanium in vacuum conditions, in the form of a high content. To solve the indicated problem using aluminium-borophosphate concentrate, chemically cured with periclase, as a silica free binder of ceramic corundum molds was suggested. The use of the combination of the indicated mold materials allows not only enabling chemical inertness of the molds, but also operating the process of mold forming. The developed technology provides the acceleration of the mold manufacturing cycle in 4...6 times, the increase the strength of the mold covers, the reduction in the heat-resistant alloy casting cost. It enables significant improvement of the quality and increase of the economic efficiency of manufacturing of precision casting from reactive metals and alloys.

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Chattopadhyay, Himadri. "Estimation of solidification time in investment casting process." International Journal of Advanced Manufacturing Technology 55, no. 1-4 (December 14, 2010): 35–38. http://dx.doi.org/10.1007/s00170-010-3057-9.

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13

Sabau, Adrian S. "Alloy shrinkage factors for the investment casting process." Metallurgical and Materials Transactions B 37, no. 1 (February 2006): 131–40. http://dx.doi.org/10.1007/s11663-006-0092-x.

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Bruna, Marek, Dana Bolibruchová, Richard Pastirčák, and Anna Remišová. "Gating System Design Optimization for Investment Casting Process." Journal of Materials Engineering and Performance 28, no. 7 (February 12, 2019): 3887–93. http://dx.doi.org/10.1007/s11665-019-03933-3.

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15

Tu, John S., Derek M. Olinger, and Albert M. Hines. "Computer-aided development of an investment casting process." JOM 45, no. 10 (October 1993): 29–32. http://dx.doi.org/10.1007/bf03222457.

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Brum, Fábio J. B., Sandro C. Amico, Ivo Vedana, and Jaime A. Spim. "Microwave dewaxing applied to the investment casting process." Journal of Materials Processing Technology 209, no. 7 (April 2009): 3166–71. http://dx.doi.org/10.1016/j.jmatprotec.2008.07.024.

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17

Kim, Myoung Gyun, Si Young Sung, Gyu Chang Lee, Joon Pyo Park, and Young Jig Kim. "Investment Casting of Near-Net Shape Gamma Titanium Aluminide Automotive Turbocharger Rotor." Materials Science Forum 475-479 (January 2005): 2547–50. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2547.

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The objective of this study was to optimize the casting design of gamma titanium aluminde automotive turbocharger rotor by means of the practical experiment and numerical simulation. Gamma titanium aluminide rotors were produced by centrifugal casting methods on a laboratory scale. Based on the metal-mold reaction of gamma titanium aluminide, the investment molds were manufactured by an electro-fused Al2O3 mold. The experimental results showed that the castings failed to reach the end of the cavities due to insufficient centrifugal force and a lower fluidity compared to the other metals. Although the satisfactory results were not obtained in the numerical simulation, it was concluded that numerical simulation aided to achieve understanding of the casting process and defect formation in gamma titanium aluminide turbocharger rotor castings.

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Pattnaik, Sarojrani, Pradeep K. Jha, and D. Benny Karunakar. "A novel method of increasing ceramic shell permeability and optimizing casting shrinkage and tensile strength of the investment cast parts." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 3 (August 8, 2016): 377–88. http://dx.doi.org/10.1177/0954405415606386.

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This study explores about enhancing the permeability of the ceramic shells used in the investment casting process using cheaply available sawdust particles. An increase in shell’s permeability augments the cooling rate of the casting which enhances its mechanical properties. It was found that the inclusion of sawdust particles into the ceramic slurries exhibited positive impact on the shell’s permeability. It is a well-known fact that electromagnetic stirring process increases the mechanical properties of the castings, but its effect on casting shrinkage has never been realized. Thus, this study further throws light on the impact of electromagnetic stirring in reducing the shrinkage and improving the tensile strength of the casting. In a nutshell, it was found that the final product quality of the investment cast part improved by the combinational treatments adopted in this research work.

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Singh, Rupinder, and Jagdeep Singh. "Investigating the Effect of Shape Factor, Slurry Layers and Pouring Temperature in Precision Investment Casting." Materials Science Forum 751 (March 2013): 35–44. http://dx.doi.org/10.4028/www.scientific.net/msf.751.35.

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This paper aimed to investigate the effect of shape factor, slurry layers and pouring temperature in precision investment casting. Three controllable factors of the precision investment casting process (namely: shape factor, slurry layers (mold thickness) and pouring temperature) were studied at three levels each by Taguchis parametric approach and single-response optimization was conducted to identify the main factors controlling surface hardness, dimensional accuracy (Δd) and surface roughness (Ra). Castings were produced using aluminum (Al), mild steel (M.S.) and stainless steel (S.S) at recommended parameters through ceramic shell precision investment casting process. The micro structure analysis has been used to study the surface morphology. Analysis shows that for surface hardness, contribution of shape factor, slurry layers and pouring temperature is 0.07%, 0.70% and 99% respectively. As regards to surface roughness, contribution of shape factor, slurry layers and pouring temperature is 1.14%, 16.80% and 81.90% respectively. Further for Δd contribution of shape factor, slurry layers and pouring temperature is 1.53%, 22.47% and 72.88% respectively. Confirmation experiments were conducted at an optimal condition showed that the surface hardness, Δd and Ra of the precision investment casting were improved significantly.

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Kusyairi, Imam. "Experimental Study on Mold-Lay Filament instead of Wax in Investment Casting Process." Journal of Energy, Mechanical, Material, and Manufacturing Engineering 5, no. 1 (May 31, 2020): 39. http://dx.doi.org/10.22219/jemmme.v5i1.10602.

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Metal casting with investment casting method is metal casting which has the ability to produce accurate parts and has a controlled fineness. Current technological developments are very influential in the development of investment casting. One of them has been found mold-lay filament as a substitute for wax, which is now wax is one of the main components in investment casting process. Mold-lay filament is printed using a 3D Printer machine. In this study, the wax in the investment casting process was replaced by a mold-lay filament with the specifications 0.75kg / 0.55 lb of 1.75mm MOLDLAY filament, prints at temperatures of 170-180 ° C. The result show that mold-lay flutes are also able to come out well from slurry molds, but require more time than wax, this is because one of the plastic mold-lay compositions, which takes a long time for the moldlay fillment to come out of the mold. Further research suggestions are needed further testing in terms of roughness of the product with moldlay filament and compared with wax. This will also see if there are any remaining moldlay filaments from the mold.

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Li, Ying Jun, Fang Wang, Qi Zhang, Chang Cun Li, and Yong He. "The Research of Grouting Sandblasting Carrying Manipulator Based Wax Casting-Line." Applied Mechanics and Materials 496-500 (January 2014): 557–60. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.557.

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Mechanization and automation are the general trend of Investment casting in the world. The paper briefly discusses the sandblasting process of investment, and introduces the shell casting process. Carrying manipulator design is proposed to complete the investment casting process. The terminal arm and other major components of structural design are discussed. The terminal clamping structure is modeled. The parameters of the terminal clamping structure are designed. The research can provide some reference for the development and design of grouting sandblasting carrying manipulator based wax casting-line.

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Bandyopadhyay-Ghosh, S., Ian M. Reaney, A. Johnson, I. M. Brook, K. Hurrell-Gillingham, and P. V. Hatton. "Castability and Biocompatibility of Novel Fluorcanasite Glass-Ceramics." Key Engineering Materials 309-311 (May 2006): 293–96. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.293.

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Novel fluorcanasite based glass-ceramics were produced by controlled two stage heattreatment of as-cast glasses. Castability of parent glasses was determined using a graduated spiral cast piece. Fluorcanasite glasses were also cast to form complex shapes using the lost wax casting technique. Gypsum and phosphate bonded investments were used to investigate their effect on the casting process, cast surface crystallinity and biocompatibility. The stoichiometric composition had the greatest castability but the other two modified compositions also had good castability. X-ray diffraction showed similar bulk crystallisation for each glass irrespective of the investment material. However, some differences in surface crystallisation in the presence of different investment materials were detected. Discs cast using gypsum bonded investment showed greater in vitro biocompatibility than equivalent discs cast using phosphate bonded investment under the conditions used. Gypsum and phosphate bonded investments could both be successfully used for the lost wax casting of these novel fluorcanasite glasses.

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Heiss, Tiziana, Ulrich E. Klotz, and Dario Tiberto. "Platinum Investment Casting, Part I: Simulation and Experimental Study of the Casting Process." Johnson Matthey Technology Review 59, no. 2 (April 1, 2015): 95–108. http://dx.doi.org/10.1595/205651315x687399.

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Abdullah, Hafid, and Sri Bimo Pratomo. "The Use of Local Raw Materials for the Manufacturing of Import Substitution Casting Products on Investment Casting Technology." Materials Science Forum 1000 (July 2020): 447–53. http://dx.doi.org/10.4028/www.scientific.net/msf.1000.447.

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The use of local raw materials for the manufacturing of import substitution casting products on investment casting technology has been done. Compared to the conventional casting process, investment casting has the advantage of being able to create a sophisticated casting product and produce a product that is near net shape, so it is no need machining process. The objective is as an effort to find an alternative method of making a quality casting product, has high added value with the utilization of local raw materials which available in Indonesia so that it can reduce the cost of production and dependence on imports of industrial raw materials which are very expensive in the investment casting process. The method of making casting products with investment casting process, including: pattern making, mould making, dewaxing, melting, pouring, finishing and testing. Investment casting technology has been successfully applied to the manufacture of rocker arm, impeller pump and turbine blade with the utilization of local raw materials ie: epoxy resin as a substitute for metal pattern, mixture wax of paraffin, and celo resin for the pattern of wax and zircon sand of Bangka island as coating slurry for ceramic mould. The discussion of this paper is expected to be a case of developing other casting products needed by Indonesia for industry such as: medical equipment, agricultural equipment, textile equipment, gun and small armaments, electronics, automotive and electrical components etc.

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Anglada, Eva, Antton Meléndez, Laura Maestro, and Ignacio Domínguez. "Finite Element Model Correlation of an Investment Casting Process." Materials Science Forum 797 (June 2014): 105–10. http://dx.doi.org/10.4028/www.scientific.net/msf.797.105.

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The achievement of reliable simulations, in the case of complex processes as is the investment casting, is not a trivial task. Their accuracy is significantly related with the knowledge of the material properties and boundary conditions involved, but the estimation of these values usually is highly complex. One helpful option to try to avoid these difficulties is the use of inverse modelling techniques, where experimental temperature measurements are used as base to correlate the simulation models. The research presented hereafter corresponds to the correlation of a finite element model of the investment casting process of two nickel base superalloys, Hastelloy X and Inconel 718. The simulation model has been developed in a commercial software focused specifically on metal casting simulation. The experimental measurements used as base for the adjustment, have been performed at industrial facilities. The methodology employed combines the use of an automatic tool for model correlation with the manual adjustment guided by the researchers. Results obtained present a good agreement between simulation and experimental measurements, according to the industrial necessities. The model obtained is valid for the two studied cases with the only difference of the alloy material properties. The values obtained for the adjusted parameters in both cases are reasonable compared with bibliographic values. These two circumstances suggest that the obtained correlation is appropriate and no overfitting problems exist on it.

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Harun, Zawati, Noor Hasliza Kamarudin, Mustaffa Ibrahim, Maizlinda Izwana Idris, and Sufizar Ahmad. "Reinforced Green Ceramic Shell Mould for Investment Casting Process." Advanced Materials Research 1087 (February 2015): 415–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.415.

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The development of thin ceramic shell mould in investment casting process is very crucial as this mould inherited brittle property and highly exposed to the cracking mechanism. The slurry composition produces green (unfired) ceramic shell mould which low in strength and easily crack or fail during wax removal or handling process. By strengthening of this brittle ceramic shell mould via reinforcement technique can enhance the strength of green shell mould body. In this work, the presence of the treated rice husk fibre have toughened the green shell mould by creating mechanical interlocking bonding in shell matrix which contributes to higher modulus rupture value. In fact, SEM observations showed that the addition of fiber to the ceramic body to form a composite shell mould prevent the crack propagation mechanism due to the existence of the matrix-fibre bridging which create the resistance of fiber to pull-out. This directly will increase the strength of green shell mould body. .

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Choi, Bong-Jae, Si-Young Sung, Myoung-Gyun Kim, and Young-Jig Kim. "Development and Technology of Lost-Wax Investment Casting Process." Journal of Korea Foundry Society 31, no. 5 (October 31, 2011): 249–54. http://dx.doi.org/10.7777/jkfs.2011.31.5.249.

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Babu, Kayala Mallikharjuna, P. Martin Jebaraj, and M. P. Chowdiah. "Standardization of investment casting process using modified binder hydrolysis." Bulletin of Materials Science 13, no. 3 (June 1990): 227–34. http://dx.doi.org/10.1007/bf02744950.

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DE BONI, Luis Alcides Brandini, Vagner CRIVELETTO, and Marcos CAMANA. "LABORATORY PROCESS FOR THE RECLAIMING OF THE CERAMICS MOLD FROM THE INVESTMENT CASTING." Periódico Tchê Química 10, no. 19 (January 20, 2013): 19–23. http://dx.doi.org/10.52571/ptq.v10.n19.2013.19_periodico19_pgs_19_23.pdf.

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Investment casting is a process used to produce parts with restricted dimensional tolerances so that after casting the parts require little or no finishing. This paper describes an experiment conducted to the reuse of by-products from the process of investment casting. Around 4kg of ceramic shell went through a process of crushing, magnetic separation of metals and screen classification, instead of being destined to the landfill. The material was separated on sieves of different diameters and grouped in two sets, one for the material of larger particle size and another for smaller particle sizes. Subsequently this material was used to produce a ceramic mold used in investment casting process, replacing the corresponding virgin raw material. The ceramic shell of the bunch produced by this technique, endured all stages of assembly, including the casting of steel (WCB) without break or crack. The reuse of raw materials in this experiment reached about 80% by weight of 4kg originally obtained.

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Roskosz, Stanisław, Dariusz Szeliga, Rafał Cygan, and Paweł Rokicki. "Investment Casting Design and Processing for Drone’s Micro-Engine Turbine Rotor Manufacturing." Solid State Phenomena 246 (February 2016): 189–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.246.189.

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The research presents methods for modern design and processing tools to be used in manufacturing process of castings in the aviation industry. In the study it is described how to use a computer simulation software and rapid prototyping / rapid tooling methods for manufacturing of drone’s micro-engine turbine rotor. The computer simulation of flow and solidification process and the investment casting technology were applied for manufactured elements.

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Taufik, Shamsuddin Sulaiman, B. T. Hang Tuah Baharudin, M. K. A. M. Arifin, and Arep Ariff Hambali. "Design and Simulation on Investment Casting Mold for Metal Matrix Composite Material." Applied Mechanics and Materials 66-68 (July 2011): 1676–81. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1676.

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This paper presents the design and simulation on investment casting mold for metal matrix composite material. The study was investigating the design parameters for the casting mold and simulated the temperature and pressure on the mold. Compressor impeller selected as the product of the study. Among the various types of casting techniques, investment casting process is the most suitable process to produce the compressor impeller. The alternative design of casting mold of investment casting was generated using CAD software. Concept scoring was prepared to select the suitable design for the investment casting process. Material selection of compressor is Aluminum Silicon Carbide. Stainless steel AISI H13 is selected as the material for the mold. The parameter for the mold design is included branch, gating, sprue and runner. The analysis was presented to the mold by using ANSYS simulation tool to determine the temperature and pressure of the mold. In addition, three case studies were presented and compared the static pressure in different velocity and temperature of the mold design. The result showed the runner and the branch size were important to produce the molten metal flow into the mold pattern. As a result, the design of investment casting mold was proposed.

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Zhang, Xi-e., Shi-qiong Li, He-li Luo, Xu Cao, Di Feng, and Shang-ping Li. "Simulation of Ni3Al-based Alloy and Investment Casting Process of its Thin Wall Castings." Israel Journal of Chemistry 47, no. 3-4 (December 2007): 363–68. http://dx.doi.org/10.1560/ijc.47.3-4.363.

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Zheng, Liang, Guo Qing Zhang, Dominik Daisenberger, Zhou Li, and Cheng Bo Xiao. "The Effect of Process Parameters in Interdendritic-Melt Solidification Control Technique on the Microstructure and Properties of a Ni-Base Superalloy." Materials Science Forum 879 (November 2016): 1129–34. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1129.

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A novel technique called interdendritic-melt solidified control (IMSC) was developed to manufacture equiaxed superalloy in the efforts of reducing porosity. The effect of process parameter, such as withdrawal rate, of the IMSC on the porosities and mechanical properties of IN792 alloy was investigated, compared with conventional investment casting (CC) technique. The IMSC and CC samples were characterized by optical metallography and scanning electron microscopy. In addition, the minor phases, such as MC carbides and trace amount of η phase, were identified by synchrotron X-ray diffraction. The results indicate that proper withdrawal rate for IMSC can produce castings with much reduced porosity and higher stress rupture properties at elevated temperature compared to conventional investment casting. However, fast withdrawal rate will produce much severe porosity and lower mechanical property.

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Omar, M. F. M., S. Sharif, Mustaffa Ibrahim, Mohd Hasbullah Idris, A. S. A. Fadzil, and Azriszul Mohd Amin. "Differential Ceramic Shell Thickness Evaluation for Direct Rapid Investment Casting." Applied Mechanics and Materials 315 (April 2013): 418–22. http://dx.doi.org/10.4028/www.scientific.net/amm.315.418.

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Rapid prototyping (RP) process offers a promising economical way as a sacrificial pattern in investment casting (IC) at high speed and low cost for low volume part manufacturing. However direct sacrificial RP pattern have encountered shell cracking during burnout process due to polymer based materials. Shell mould thickness was need to be concerned to have strong enough to withstand RP part expansion for employing direct method. The aim of present research was to compare the efficacy of different shell thickness for aluminum casting part fabricated from acrylonitrile butadiene styrene (ABS) and acrylate based material made from FDM and MJM respectively. The hollow RP pattern has been used directly to produce ceramic moulds. The feasibility of ceramic mould has been assessed in term of burnout ability and crack defect. Dimensional accuracies and surface roughness of the castings part have been observed in this investigation. Result shows thicker mould with proposed stuco procedure resulted without any crack defect for botRP part and no residual ash remained when firing higher than 870°C of temperature.In addition, FDM produced better accuracy for overall mould thickness, but MJM have better surface roughness. Therefore both direct RP pattern were suitable to be used in IC process with proposed shell thickness.

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Marwah., O. M. F., S. Sharif, M. A. Zainol, M. Ibrahim, and Elmy Johana Mohamad. "3D Printer Patterns Evaluation for Direct Investment Casting." Applied Mechanics and Materials 465-466 (December 2013): 1400–1403. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.1400.

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The term direct investment casting represents the employment of pattern fabricated by rapid prototyping technique have been reduce the cost and production lead time. The non-wax materials having robust ability on producing pattern in accuracy stability and clean burnout. However 3D printer (3DP) parts are powder based materials and not easily burnout during firing process. The purpose of this investigation were to evaluate the ZP150 powder materials as a sacrificial pattern to be used in investment casting (IC) process. Result shows powder based patterns of 3DP process failed to disintegrate completely even at high temperature during collapsibility investigations. However the pattern become brittle and easily remove by water pressure. Therefore the ceramic mould can be used for metal casting.

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Singh, Sunpreet, and Rupinder Singh. "Precision investment casting: A state of art review and future trends." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 230, no. 12 (August 8, 2016): 2143–64. http://dx.doi.org/10.1177/0954405415597844.

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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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Guo, Yong Liang, Shu Long Xiao, and Li Juan Xu. "Numerical Simulation of Process of Cavity Filling and Solidifying in TiAl Alloy Investment Casting." Materials Science Forum 575-578 (April 2008): 1489–94. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1489.

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In this paper, numerical simulation software of AnyCasting was adopted for simulate processes of titanium aluminum alloys filling and solidifying. Pour temperature, pressure head and rotate speed had an important effect on casting quality. The former parameters as factors orthogonal experiment L7 (33) was carried out and the experimental scheme was optimized. The results showed that as the pour temperature rising the filling time had no change, solidifying time had a large increase and casting defect tendency tended to little. Filling time and solidifying time decreased with the pressure head rising and casting defect tendency changed from little to large. The effect of rotating speed on filling time was as that of pressure head, solidifying time had little change and casting defects tendency of casting changed from little to great. With the optimized parameters of casting temperature of 1650°C, pressure head of 0.2m and rotating speed of 200r/min the investment cast filling and solidifying simulations was made out. The results showed that in the optimized simulation the liquid metal filled mold from the top down, filling course was smooth and complete and temperature field was even. Through analyses of casting defects the optimized scheme proved to be logical.

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Kim, Shae K., Hyung Ho Jo, Sung Chul Lim, Hyouk Chon Kwon, Beom-Suck Han, and Young Jig Kim. "Process Improvement for Investment Casting of SiCp/AZ91D Magnesium Composite." Materials Science Forum 426-432 (August 2003): 2009–14. http://dx.doi.org/10.4028/www.scientific.net/msf.426-432.2009.

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Anglada, E., A. Meléndez, L.Maestro, and I. Domiguez. "Adjustment of Numerical Simulation Model to the Investment Casting Process." Procedia Engineering 63 (2013): 75–83. http://dx.doi.org/10.1016/j.proeng.2013.08.272.

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Wang, Donghong, Bo He, Fei Li, and Baode Sun. "Numerical Simulation of the Wax Injection Process for Investment Casting." Materials and Manufacturing Processes 28, no. 2 (February 2013): 220–24. http://dx.doi.org/10.1080/10426914.2012.746788.

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Ben Lenda, O., A. Tara, O. Jbara, and E. Saad. "Numerical simulation of investment casting process of nickel-based alloy." MATEC Web of Conferences 286 (2019): 03005. http://dx.doi.org/10.1051/matecconf/201928603005.

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In this paper, we elaborated the nickel-based alloy type Hastelloy G30 and we analyzed it by techniques of characterization in order to interpret the results obtained through a computer simulation. The calculation of the thermo-physical properties of the alloy and the simulation of filling and solidification of the casting was performed by the software ProCAST. The validation of the numerical results was done by the following experimental techniques: optical microscopy and hardness test. In the center of the elaborate piece, the experimental results showed the appearance of porosity and leading to embrittlement of the alloy. According to the numerical simulation, this is caused by a fraction of the liquid that remains trapped in this area.

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Previtali, Barbara, Dante Pocci, and Cataldo Taccardo. "Application of traditional investment casting process to aluminium matrix composites." Composites Part A: Applied Science and Manufacturing 39, no. 10 (October 2008): 1606–17. http://dx.doi.org/10.1016/j.compositesa.2008.07.001.

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Pattnaik, Sarojrani, D. B. Karunakar, and P. K. Jha. "Utility-Fuzzy-Taguchi based hybrid approach in investment casting process." International Journal on Interactive Design and Manufacturing (IJIDeM) 8, no. 2 (March 15, 2013): 77–89. http://dx.doi.org/10.1007/s12008-013-0183-2.

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Sharma, Ankit, Mayukh Acharya, Alok Agarwal, Govind, S. C. Sharma, K. Sreekumar, and Parameshwar Prasad Sinha. "Study of Shell Cracking Behavior and its Remedies in Investment Casting Process Using Quick Cast Rapid Prototype Polymer Patterns." Materials Science Forum 710 (January 2012): 214–19. http://dx.doi.org/10.4028/www.scientific.net/msf.710.214.

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Investment casting has emerged as the foremost casting process for manufacturing of intricate parts where better dimensional accuracy is required. Use of rapid prototyping polymer patterns is one of the major advancements in investment casting process. Elimination of die making step as required in the traditional wax process makes it quicker and a cost effective process. The direct conversion of 3D CAD data into rapid prototyping pattern decreases development time, chances of costly mistakes, minimizes sustaining engineering changes and extend product lifetime by adding necessary features and eliminating redundant features early in the design.

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Singh, Rupinder, and Gurwinder Singh. "Investigations for statistically controlled investment casting solution of FDM-based ABS replicas." Rapid Prototyping Journal 20, no. 3 (April 14, 2014): 215–20. http://dx.doi.org/10.1108/rpj-03-2013-0036.

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Purpose – The purpose of the present study is to investigate statistically controlled investment casting (IC) solution of fused deposition modeling (FDM)-based ABS replicas. Design/methodology/approach – The work started with the identification of the benchmark/component. Prototypes (to be used as pattern) were built on FDM with ABS plastic material, followed by IC. The measurements on final casting prepared were made on the co-ordinate measuring machine (CMM) from which international tolerance (IT) grades were calculated to establish the dimensional accuracy of the components. Findings – This study further highlighted the cast component properties (like hardness and surface finish) for suitability of this process. Final castings produced are acceptable as per international standard organization (ISO) standard UNI EN 20286-I (1995). Originality/value – This process ensures development of statistically controlled IC solution as technological prototypes and proof of concept at less production cost and time.

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Wang, Cheng Jun, Yan Zheng, and Kai Liu. "Research on Metamorphic Vibration Casting Process Based on EDEM-FLUENT Coupling." Key Engineering Materials 764 (February 2018): 361–69. http://dx.doi.org/10.4028/www.scientific.net/kem.764.361.

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In order to reduce the defects of investment casting and improve its casting quality, vibration technology and casting technology are combined effectively and the effect of vibration degree of freedom, frequency and amplitude on the filling ability of liquid metal are studied by means of EDEM-FLUENT solid liquid coupling visualization. With the use of orthogonal test method, the sensitivity of the particles towards each parameter index is obtained. Optimal vibration parameters are chosen and then the best variable cell vibration casting solution is obtained.

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Mubarok, Fahmi, Putri Intan Usi Fauzia, Sutikno, Ferdiansyah Mahyudin, and Dwikora Novembri Utomo. "Influence of Thermal Cycling Temperature on the Recrystallization of Cold Rolled Stainless Steel 316L." Key Engineering Materials 867 (October 2020): 218–23. http://dx.doi.org/10.4028/www.scientific.net/kem.867.218.

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Investment casting of an orthopedic implant plate based on stainless steel 316L was considered an economical process. Nevertheless, the mechanical properties of the investment casting product were found to be inferior as compared to the implant plate fabricated with other methods such as forging due to their differences in the microstructure. Investment casting mostly produced coarser grain as compared to those with forging or rolled process. In order to improve their mechanical properties, cold-rolling followed by a repetitive thermal cycling process is proposed. The goal is to generate finer grain size through recrystallization process leading to nucleation of new grain during the thermal cycling process thus increasing their strength. Stainless steel 316L was cold-rolled to 52% reduction in thickness and this process generate stored strain energy in the form of dislocation density in the material. The thermal cycling treatment performed within several cycles after cold rolling enabling gradual disperse of stored strain energy that facilitates the recrystallization process that initiates new grain formation. The short holding time within several cycles limits the grain growth that normally occurs during annealing. It was found that thermal cycling treatment at a temperature of 950 °C for 35 seconds within four cycles led to the formation of finer grain size of 22 µm on average as compared to the initial investment casting average grain size of 290 µm. The hardness also increases to 253 HV0.3 in this condition as compared to 155 HV0.3 of investment casting products. Lower thermal cycling temperature than 950 °C during the test did not result in grain refinement thus indicating that strain energy relieves were not enough to aid the recrystallization process.

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He, Bo, Dong Hong Wang, Fei Li, and Bao De Sun. "Simulation Study on Wax Injection for Investment Casting." Advanced Materials Research 834-836 (October 2013): 1575–79. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1575.

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As investment castings grow in size and complexity, control of wax pattern dimensions becomes increasingly important and difficult. Conventionally, mold design and dimensions are re-worked by trial-and-error procedures until casting dimensions are produced within acceptable dimensional tolerances, increasing the cost of the castings.Nowadays, numerical simulation is an efficient tool for mold design. However, one of the critical difficulties in using computer models for the simulation of wax injection process is the lack of material properties of the wax. Material property measurements were conducted in this study that can be used as input in Moldflow. Then, 3D numerical simulation could be applied in analysis with mold design of thin-walled wax pattern, with high dependability. Simulation results of filling time and the location of the air traps were analyzed. Consequently, best gate location and reasonable gate system were determined. The paper highlighted the effectiveness of simulation in filling optimization and deformation of wax pattern.

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Yang, Liang, Li Hua Chai, Lai Qi Zhang, and Jun Pin Lin. "Numerical Simulation and Process Optimization of Investment Casting of the Blades for High Nb Containing TiAl Alloy." Materials Science Forum 747-748 (February 2013): 105–10. http://dx.doi.org/10.4028/www.scientific.net/msf.747-748.105.

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Low pressure turbine blades (LPT) made by investment casting from intermetallic titanium aluminide alloys for aero-engine applications have about 50% weight saving compared with that from nickel-based counterparts. Investment casting process of the low pressure turbine blades for high Nb containing TiAl alloy was simulated by Procast. The height of the blade is about 125mm and the thinnest part of it is about 6mm. Compositions of the cast and mould are Ti-45.5Al-8Nb (at %) and Zircon sand, respectively. The simulation result showed that there were porosities appearing in the centre of blades, which may be due to the formation of isolated liquid. In this work, the simulation, analysis and comparison of different casting ways were carried out. The result showed that compared with top and bottom casting, blades made by side casting have less porosity defects. And then the casting temperature, casting velocity, mould preheating temperature and interface heat transfer coefficient were optimized based on orthogonal design. The result also indicated that the influence of process parameters to porosity defects of blades can be ranked from strong to weak as follow: casting temperature>shell mould preheating temperature>casting velocity>interface heat transfer coefficient. When the casting temperature was 1700, the mould preheating temperature was 500, the casting velocity was 0.5 m·s-1, and the interface heat transfer coefficient was 500 W·m-2·K-1, the volume of porosity defects was the smallest.

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Li, Yang, Pei Jia Li, Xing Fu Chen, Hao Ran Liu, Jian Tao Wu, and Jun Tao Li. "Investment Casting Defects of a Turbine Nozzle Made by K465 Alloy." Materials Science Forum 898 (June 2017): 487–91. http://dx.doi.org/10.4028/www.scientific.net/msf.898.487.

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The investment casting defects in a turbine nozzle with size of φ 331mm and thickness 0.7 mm and the number of vanes of 31 have been studied in two aspects, which were the porosity of the turbine nozzle’s inner cone and the cracks of the turbine nozzle’s vanes. ProCAST software was used to analyze the nozzle’s solidification process. A suitable gating system was used to solve porosity issues effectively by changing local thickness and improving solidification conditions. The crack on the nozzle’s vanes was studied and a kind of grain refiner was used to solve crack issues by improving shell strength. In order to manufacture castings with high metallurgical quality and meet the design and use demands, a reasonable gating system and a moderate shell process were used.

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Journal articles on the topic 'Investment casting process'

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