Journal articles: 'Investment casting'

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Prasanna, BG, M. Kalavathi, Bhuvana Sachin, TV Shreeharsha, B. Praveen, and Mallikarjuna Ragher. "Marginal Accuracy of Castings Fabricated with Ringless Casting Investment System and Metal Ring Casting Investment System: A Comparative Study." Journal of Contemporary Dental Practice 17, no. 2 (2016): 165–70. http://dx.doi.org/10.5005/jp-journals-10024-1821.

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ABSTRACT Background The thermal expansion of the investment can be restricted by the metal casting ring because the thermal expansion of the ring is less than that of the investment. The ringless casting procedure is in use in clinical dentistry, though there is little scientific data to support its use in fixed partial dentures. In this study, marginal discrepancy of castings produced with the ringless casting technique and the conventional technique using the metal rings were compared. Materials and methods A total of 30 wax patterns were fabricated directly on a metal die. Optical stereomicroscope was used to measure the marginal discrepancy between the metal die and wax patterns. A total of 15 castings were invested using Bellavest T phosphate-bonded investment with the ringless technique and 15 were invested with the same investment with a metal ring; 30 castings were produced using a nickel-chromium ceramo-metal alloy. The internal surface of the castings was not modified and seated with finger pressure. The vertical marginal discrepancy was measured using an optical stereomicroscope at a magnification of 100×. The data obtained were statistically analyzed using students t-test (paired t-test and unpaired t-test). Results The castings of the ringless technique provided less vertical marginal discrepancy (240.56 ± 45.81μ) than the castings produced with the conventional metal ring technique (281.98 ± 53.05μ). The difference was statistically significant. Conclusion The ringless casting technique had produced better marginal accuracy compared with conventional casting technique. Ringless casting system can be used routinely for clinical purpose. How to cite this article Kalavathi M, Sachin B, Prasanna BG, Shreeharsha TV, Praveen B, Ragher M. Marginal Accuracy of Castings Fabricated with Ringless Casting Investment System and Metal Ring Casting Investment System: A Comparative Study. J Contemp Dent Pract 2016;17(2):165-170.

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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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Morey, E. F., and R. Earnshaw. "The Fit of Gold-alloy Full-crown Castings Made with Pre-wetted Casting Ring Liners." Journal of Dental Research 71, no. 12 (December 1992): 1858–64. http://dx.doi.org/10.1177/00220345920710120101.

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Measurements were made of the fit of full-crown gold-alloy castings produced with two types of pre-wetted ring liner (asbestos and cellulose) and a typical gypsum-bonded investment (Cristobalite Inlay, Sybron/Kerr Products, Romulus, MI; W/P = 0.40). Laboratory measurements were made of the effects of the liners on potential investment expansion, and properties of the lining materials considered relevant to casting accuracy were also measured. There was a wide variation in values for mean dimensional inaccuracy. One liner produced a series of castings all of whose inaccuracies lay within the range ± 0.1%, with a mean value of + 0.01%. With the other five liners, all or most castings were undersize. With three, all or most castings showed inaccuracies worse than -0.2%. The values for casting inaccuracy with the various liners showed a probable correlation with potential investment expansion (p < 0.05); however, no correlation was found between casting inaccuracy and any apparently relevant liner properties, alone or in combination. In casting techniques which use a pre-wetted ring liner, the choice of a specific lining material is an important factor which has a significant effect on casting inaccuracy. With at least three of the six liners tested, a higher investment expansion was needed for accurate full-crown castings to be ensured.

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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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Parlad Kumar, Rupinder Singh, and IPS Ahuja. "A Framework for Developing a Hybrid Investment Casting Process." Asian Review of Mechanical Engineering 2, no. 2 (November 5, 2013): 49–55. http://dx.doi.org/10.51983/arme-2013.2.2.2346.

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Traditionally, the process of investment casting is used for making complex components. But, investment casting is considered economical only when the production volume is high enough. If only limited numbers of pieces are promptly required such as in making prototypes, design iterations and design optimisations the investment casting process proves to be very costly due to time and tooling cost for making dies for producing wax patterns. In such situations, the rapid prototyping technologies are considered very useful as these can produce the patterns with good accuracy and without the necessity of costly hard tooling. The fused deposition modeling (FDM) is one of the rapid prototyping technology that can use plastic material, which can be effectively used for making patterns for investment casting. This combination of the traditional investment casting process with the modern rapid prototyping technologies to obtain a new process may be termed as hybrid investment casting. This study is intended to develop a framework for developing a hybrid investment casting process for industrial applications. For this newly developed process, various process parameters, their control and effects have been represented to obtain the desirable mechanical and metallurgical properties of the castings.

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Liu, Yong Zhen, Guo Ming Cui, Jian Min Zeng, Wu Kui Gan, and Jin Bo Lu. "Prediction and Prevention of Distortion for the Thin-Walled Aluminum Investment Casting." Advanced Materials Research 915-916 (April 2014): 1049–53. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.1049.

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Investment casting is one of main precision casting processes to realize near net shape castings. For the castings with thin-walled cross section or complicated shape, it is easy to generate casting stress such as thermal stress, mechanical stress and phase transformation stress, resulting in casting deformation due to the uneven cooling and hindered contraction. Once three-dimensional deformation is formed, it is very hard to correct. In this paper the finite element method (FEM) was used to analyze the stress and deformation of thin-walled lost wax casting. The results show that the temperature and stress distributions are uneven in the casting and the tendency to deform is higher even with insulating shell mold. And based on the results, the technical measures of adding supporting ribs are adopted to restrain deformation. The practice of volume production indicates that no casting was rejected due to deformation defects.

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Anderson, J. "Brass Investment Casting." International Journal of Metalcasting 7, no. 1 (January 2013): 60–61. http://dx.doi.org/10.1007/bf03355547.

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Hogade, Prof Hemant. "Investment Casting Using FDM 3-D Printing." International Journal for Research in Applied Science and Engineering Technology 10, no. 7 (July 31, 2022): 4216–20. http://dx.doi.org/10.22214/ijraset.2022.45967.

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Abstract: The earliest casting method is investment casting, which dates back to roughly 3500 BC. Precision casting and near net form are two applications. Product demand is increasing in India and around the world. The use of simulation and rapid prototyping techniques in the investment casting process improves quality while reducing lead time and cost. However, as complexity increases, the traditional sand casting technique has limits, one of which is the expensive expense of equipment to make moulds and cores. These limitations can be solved by using a 3D printer, which offers the distinct advantage of geometric freedom. A polycast design is created in the precise shape of the item to be cast in this project. A refractory ceramic substance has been applied to this pattern. The metal is flown through a mould that is linked to the tree. The accuracy and surface finish of the models and castings were also assessed in order to provide a comparison. It has a significant impact on part quality (surface finish, dimensional correctness, strength, and longevity), as well as lead time and cost. In terms of remote pattern manufacture, it offers a lot of potential

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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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Aliyev, Elman. "NATIONAL ECONOMIC SIGNIFICANCE UNDER THE CONDITIONS OF THE ECONOMY OF KNOWLEDGE OF CASTING PRODUCTION AND THE KEY DIRECTIONS OF ITS DEVELOPMENT." ETM - Equipment, Technologies, Materials 05, no. 01 (January 20, 2021): 16–20. http://dx.doi.org/10.36962/etm0501202016.

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The modern economy is increasingly based on knowledge and, more broadly, on intangible assets that ensure sustainable innovation growth. The formation of an innovative type of knowledge economy can be considered one of the fundamental development trends at the global level. The modernization of the economy in the lifetime period means the introduction of modern technologies, increasing energy efficiency and labor productivity, producing high-quality products according to the most advanced standards. Ultimately, this is the creation of a competitive economy. Keywords: Casting, billet, castings, method of making castings, injection molding, centrifugal casting, investment casting, shell casting, chill casting.

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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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Leal, Mônica Barbosa, Valéria Oliveira Pagnano, and Osvaldo Luiz Bezzon. "Effect of investment type and mold temperature on casting accuracy and titanium-ceramic bond." Brazilian Dental Journal 24, no. 1 (2013): 40–46. http://dx.doi.org/10.1590/0103-6440201302042.

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This study evaluated the casting accuracy of crown margins and metal-ceramic shear bond strength (SBS) of pure titanium injected into casting molds made using 2 investment types at 3 mold temperatures. Sixty crown (30-degree beveled finish line) and 60 cylinder (5 mm diameter × 8 mm high) patterns were divided into 6 groups (n=10), and cast using a phosphate-bonded investment (P) and a magnesium oxide-bonded investment (U), at 400°C (groups P400 and U400), 550°C (groups P550 and U550) and 700°C (groups P700 and U700) mold temperatures. Crown margins were recorded in impression material, the degree of marginal rounding was measured and margin length deficiencies (µm) were calculated. Titanium-ceramic specimens were prepared using Triceram ceramic (2 mm high) and SBS was tested. Failure modes were assessed by optical microscopy. Data were subjected to two-way ANOVA and Tukey's HSD test (α=0.05). For casting accuracy, expressed by marginal deficiency (µm), investment U provided more accurate results (64 ± 11) than P (81 ± 23) (p<0.001). The increase in temperature resulted in different effects for the tested investments (p<0.001), as it provided better casting accuracy for U700 (55 ± 7) and worse for P700 (109 ± 18). Casting accuracy at 700°C (82 ± 31) was significantly different from 400°C (69 ± 9) and 550°C (68 ± 9) (p<0.05). For SBS, there was no significant differences among the groups for factors investment (p=0.062) and temperature (p=0.224), or for their interaction (p=0.149). Investment U provided better casting accuracy than investment P. The SBS was similar for all combinations of investments and temperatures.

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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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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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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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Isobe, Susumu. "Investment Casting of TiAl." Materia Japan 35, no. 10 (1996): 1114–17. http://dx.doi.org/10.2320/materia.35.1114.

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Bricin, David, Josef Odehnal, Antonín Kříž, and Zbyněk Špirit. "Analysis of Defects Associated with Manufacturing Keys for Brass Musical Instruments." Defect and Diffusion Forum 417 (June 28, 2022): 95–100. http://dx.doi.org/10.4028/p-0ttv30.

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This article deals with the problematics of the production of small castings using gravitational investment casting. These are castings with a relatively complex shape, which are used as parts of trigger assembly for musical wind instruments. During their production, various defects occur which are connected with the casting process. The aim of this article is to describe the defects and suggest possible methods for removing them. The first step was to find and identify these defects using metallographic and EDX microanalysis. Furthermore, a simulation calculation of the casting process was used to determine the influence of the casting geometry on casting quality. Based on these analyses, the most suitable alloy and casting system geometry were proposed for the production of the casting.

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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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Sánchez R, Claudia Marcela, and Carlos Julio Cortés Rodríguez. "Rapid casting and new technologies in investment casting." Ingeniería e Investigación 26, no. 1 (January 1, 2006): 116–19. http://dx.doi.org/10.15446/ing.investig.v26n1.14683.

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Rapid prototyping is a manufacturing process which is different to traditional methods as material is not removed or formed but added to obtain the designed pieces. It is not just used for manufacturing finished products but in manufacturing tooling for speeding up other manufacturing processes. This paper introduces rapid prototyping as a support technique for the lost wax process (investment casting). It gives a brief description of the different techniques implemented to date and materials used for making articles as part of the lost wax process.

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Rengsomboon, A., S. Luankosolchai, N. Moonrin, W. Samit, S. Petcrie, R. Sirichaivetkul, and J. Kajornchaiyakul. "I-4 INVESTIGATION OF ALTERNATIVE DESIGN OF INVESTMENT CASTING SYSTEM(Session: Casting/Molding)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 150. http://dx.doi.org/10.1299/jsmeasmp.2006.150.

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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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Chen, Yan Fei, Shu Long Xiao, Jing Tian, Li Juan Xu, and Yu Yong Chen. "Development of Ceramic Moulds with Zirconia Primary Coat for Investment Casting of Gamma Titanium Aluminide Based Alloys." Applied Mechanics and Materials 55-57 (May 2011): 881–85. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.881.

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The fabrication of ceramic moulds with zirconia primary coat for investment casting of gamma titanium aluminide based alloys (hereafter called TiAl alloys) was described in this study. The microstructures and fracture strength of ceramic moulds were characterized. The fracture strength and surface roughness of the ceramic moulds with zirconia primary coat were sufficient for the TiAl investment casting. TiAl blades were used for the technology demonstration in producing TiAl components. TiAl castings produced by the ceramic moulds exhibited an average surface roughness (Ra ) of 6 μm.

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Kaila, Vishal N., and Indravadan B. Dave. "An Investigation into the Effect of Backup Coat Sands on Investment Casting Products." Jurnal Kejuruteraan 34, no. 1 (January 30, 2022): 109–15. http://dx.doi.org/10.17576/jkukm-2022-34(1)-10.

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Investment casting is a well-known method for producing precise and finished products. The shell-making process takes a long time and consumes a large amount of coating sands. On the wax pattern tree, the ceramic coating sands are used as a primary coat and several backup coats. Zirconia sand is used for primary coating on a shell in this work. Backup coat sands are made up of fused silica and alumina silica. Colloidal silica is used as a binding material in the formation of all shells. In the work, the effect of fused silica and alumina-silica sand as a backup coat on casting properties was determined. The experimental work evaluated casing properties such as microstructures, grain size measurement, gas porosity, and shrinkages. On the dried, de-waxed, and fired shell, the porosity of the shell mold was determined for the permeability level. Alumina-silica sand has a porosity of 27 to 31 percent, whereas fused silica has a porosity of 22 to 25 percent. It produces better casting properties in alumina–silica casting products than fused silica. Casting grain sizes range from 22 to 38 microns. The grain size of alumina-silica casting is finer than that of fused silica shell casting. Gas porosity and shrinkage in the casting were found to be moderate in all castings.

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Macků, M., and M. Horáček. "Applying RP-FDM Technology to Produce Prototype Castings Using the Investment Casting Method." Archives of Foundry Engineering 12, no. 3 (September 1, 2012): 75–82. http://dx.doi.org/10.2478/v10266-012-0085-y.

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Abstract The research focused on the production of prototype castings, which is mapped out starting from the drawing documentation up to the production of the casting itself. The FDM method was applied for the production of the 3D pattern. Its main objective was to find out what dimensional changes happened during individual production stages, starting from the 3D pattern printing through a silicon mould production, wax patterns casting, making shells, melting out wax from shells and drying, up to the production of the final casting itself. Five measurements of determined dimensions were made during the production, which were processed and evaluated mathematically. A determination of shrinkage and a proposal of measures to maintain the dimensional stability of the final casting so as to meet requirements specified by a customer were the results.

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Xie, Shiyu, Zhaozhao Lv, and Shengquan Dong. "Study on the Optimization of Investment Casting Process of Exhaust Elbow for High-Power Engine." Metals 14, no. 4 (April 20, 2024): 481. http://dx.doi.org/10.3390/met14040481.

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The high-power engine exhaust elbow has a complex construction, which makes it susceptible to casting flaws that could negatively impact its functionality. Therefore, the investment casting scheme was established and optimized in this study in order to cast structurally complete exhaust elbows for high-horsepower engines. ProCAST software was used to simulate and optimize the casting and solidification processes. The optimal process parameters were determined as follows: pouring temperature of 1650 °C, pouring speed of 1.5 kg/s, and shell preheating temperature of 1050 °C. The optimization of the primary parameters of the casting process, along with the results of dimensional accuracy analysis, shape and positional deviation, and defect detection, were validated through testing. The results indicated that the optimized castings had no casting defects and complied with the design specifications.

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Bakrewal, Ayush. "Systematic Review on Investment Casting." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (December 31, 2021): 1764–71. http://dx.doi.org/10.22214/ijraset.2021.39632.

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Abstract: The Investment casting (IC) method is now used to make all precision components in the medical, hydropower, defence, car, and other sectors. IC has a wide range of applications and is well-known for its ability to make complex near-net form items with great dimensional precision and surface polish. Various scholars are making ongoing efforts to investigate the topic of investment casting. This publication offers a comprehensive survey of the studies in this vast topic. It emphasises improvements in the earliest stages of the investment casting process. It focuses on pattern creation improvements, mould composition, casting materials, and typical flaws, as well as preventative actions. Keywords: Investment casting, Pattern modelling, Mould, TiAl alloys, defects

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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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Sigirisetty, Mohit. "Role of Additive Manufacturing in Investment Casting Process." International Journal for Research in Applied Science and Engineering Technology 10, no. 4 (April 30, 2022): 278–86. http://dx.doi.org/10.22214/ijraset.2022.41227.

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Abstract: The aim of this study was to describe systematically the best available evidence of Additive manufacturing (AM) technology for different casting paths and How Rapid Investment casting (RIC) is revolutionizing the field of casting. The objective of this systematic review is to investigate the capabilities and effectiveness of Additive Manufacturing to provide an effective solution for investment casting production. Google Scholar, ResearchGate, Mendeley, ScienceDirect databases are used for research purposes. The conventional method of Investment Casting is less effective in terms of cost and time to develop new hard tooling wax patterns for low volume production and prototypes. To overcome this problem, we introduced additive manufacturing for making patterns for investment casting. This paper reviews the specific applications of Rapid prototyping in the field of casting. After applying the inclusion criteria, we found 40 articles for reviewing. This study concluded that using Additive manufacturing in Investment casting in place of the conventional method is more cost- effective and time-efficient. Keywords: Additive Manufacturing, Rapid Investment Casting.

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Tkachenko, S. S., V. O. Emelyanov, and K. V. Martynov. "Modern technology of investment casting for the production of artistic castings." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 1 (March 26, 2021): 49–52. http://dx.doi.org/10.21122/1683-6065-2021-1-49-52.

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The publication describes modern methods of production of fine plastic art castings. The stage of production of the smelted model and development of casting technology is considered. The theoretical basis for obtaining smelted models of a given quality is given. The review of technologies of production of standard castings is presented.

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Ripetskiy, A. V., G. K. Khotina, and O. V. Arkhipova. "The role of additive manufacturing in the investment casting process." E3S Web of Conferences 413 (2023): 04015. http://dx.doi.org/10.1051/e3sconf/202341304015.

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The aim of this study was to systematically describe the additive manufacturing (AM) technologies used for various casting technologies and how rapid investment casting (RIC) is changing the field of casting. The capability and effectiveness of additive manufacturing to provide investment casting production solutions has been investigated. The traditional investment casting method is less efficient in terms of cost and time to develop new wax models of solid tooling for low volume production or prototypes. To overcome this problem, it is proposed to introduce additive manufacturing to these processes to produce investment casting models. This paper discusses specific applications of rapid prototyping in this area. The study concluded that the use of additive manufacturing for investment casting instead of the traditional method is more cost- and time-efficient. Terms and designations: RP – Rapid Prototyping, IC, RIC –(Rapid) Investment Casting, PM – Project Manager, AT – Additive technologies, AM – Additive manufacturing

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Bulling, Florian, Ulrich E. Klotz, Alexander Heiss, Lisa Freitag, Christina Faßauer, and Christos G. Aneziris. "Towards High-Quality Investment Casting of Ti-6Al-4V with Novel Calcium Zirconate Crucibles and Optimized Process Control." Metals 14, no. 11 (October 26, 2024): 1222. http://dx.doi.org/10.3390/met14111222.

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The investment casting of titanium and its alloys relies on a high resistance of the crucibles and shell molds in terms of temperature and reactivity. The availability of ceramic crucibles that offer sufficient resistance to the titanium melt enables vacuum induction melting (VIM). CaZrO3 prepared from a mixture of CaO and ZrO2 as a raw material for refractory ceramics shows a high corrosion resistance against metallic melts even under very high temperatures up to 1800 °C. Crucibles and shell molds of CaZrO3 were successfully produced and used in subsequent casting trials. This study is focused on the refractory crucibles suitable for casting Ti-6Al-4V (Ti-64) using a tilt casting machine. In order to evaluate the crucible reaction and, therefore, the quality of the castings, chemical analyses, investigations of the microstructures and hardness measurements were carried out. Careful control of the melting duration is mandatory to avoid crucible reactions that otherwise result in contamination of the cast with oxygen and zirconium. This was achieved by modified coil geometries. Under optimized casting conditions, the oxygen and zirconium impurity limits of ASTM B367-09 for titanium castings were met. Based on the correlations found, optimized casting parameters with regard to material quantity, coil geometry and heating power could be determined in order to provide guidance for a high-quality casting process with VIM.

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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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Asmoro, Anan Tri. "Perbandingan Kualitas Hasil Pengecoran Metode Sand Casting Dan Metode Pengembangan Lost Foam Invesment Casting Dengan Variasi Bahan Pengikat Berdasarkan Analisis Hasil Pengecoran." Jurnal Teknik Mesin dan Pembelajaran 2, no. 1 (November 3, 2019): 117. http://dx.doi.org/10.17977/um054v2i1p117-123.

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Penelitian ini merupakan penelitian komparasi antara metode sand casting dan pengembangan metode lost foam investment casting dengan variasi bahan pengikat bentonit pada sand casting dan semen merah pada lost foam investment casting. Metode yang digunakan pada penelitian ini menggunakan metode pre experimental design dengan model intact group comparision dengan analisis deskriptif. Pengujian yang digunakan meliputi uji visual, uji kekersan vikers, dan struktur mikro. Adapun hasil dari penelitian ini menunjukkan pada uji visual didapatkan metode pengembangan lost foam investment casting memiliki kehalusan yang lebih baik dari sand casting. Berdasarkan nilai kekerasan vikers lost foam investment casting memiliki nilai kekerasan 61.07 HV lebih tinggi dari sand casting dengan nilai kekerasan rata-rata 55.85 HV. Berdasarkan nilai uji struktur mikro didapatkan lost foam invesment casting memiliki struktur butir yang lebih homogeny dibandingkan dengan sand casting.

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Tscheuschner, D., and Lorenz Ratke. "Investment Casting in Silica Aerogels." Materials Science Forum 329-330 (January 2000): 479–86. http://dx.doi.org/10.4028/www.scientific.net/msf.329-330.479.

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Ott, Dieter, and Christoph J. Raub. "Investment casting of gold jewellery." Gold Bulletin 19, no. 1 (March 1986): 2–7. http://dx.doi.org/10.1007/bf03214637.

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Ott, Dieter, and Christoph J. Raub. "Investment casting of gold jewellery." Gold Bulletin 19, no. 2 (June 1986): 34–39. http://dx.doi.org/10.1007/bf03214641.

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Ott, Dieter, and Christoph J. Raub. "Investment casting of gold jewellery." Gold Bulletin 18, no. 2 (June 1985): 58–68. http://dx.doi.org/10.1007/bf03214688.

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Ott, Dieter, Christoph J. Raub, and William S. Rapson. "Investment casting of gold jewellery." Gold Bulletin 18, no. 3 (September 1985): 98–108. http://dx.doi.org/10.1007/bf03214692.

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Ott, Dieter, and Christoph J. Raub. "Investment casting of gold jewellery." Gold Bulletin 18, no. 4 (December 1985): 140–43. http://dx.doi.org/10.1007/bf03214696.

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Murty, Y. V., C. W. Hershberger, and P. C. Wilson. "Investment casting nickel-beryllium alloys." JOM 41, no. 7 (July 1989): 56–58. http://dx.doi.org/10.1007/bf03220277.

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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/scientific5/amr.445.349.

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Ainsley, Chris, N. Reis, and B. Derby. "Rapid Prototyping of Ceramic Casting Cores for Investment Casting." Key Engineering Materials 206-213 (December 2001): 297–300. http://dx.doi.org/10.4028/www.scientific.net/kem.206-213.297.

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MORI, Toshiko, and Farzaneh AGHAJANI. "Gypsum-bonded Investment and Dental Precision Casting (II) Investment for the Quick Casting Technique." Dental Materials Journal 22, no. 4 (2003): 521–31. http://dx.doi.org/10.4012/dmj.22.521.

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Zhao, Er Tuan, Fan Tao Kong, and Yuong Chen. "Physical Properties of Primary Slurry for Titanium Investment Casting." Advanced Materials Research 314-316 (August 2011): 742–46. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.742.

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Investment casting technique presents more advantages in the production of accuracy and versatility components. The mechanical performance of the ceramic shell is crucial to the quality of the castings. The slurry parameters can affect the properties of the ceramic shell. The purpose of this paper is to investigate the physical properties of primary slurry for titanium and titanium alloy investment casting. Three different slurries (ZrO2, Y2O3 and Al2O3) were evaluated respectively by comparing the parameters: viscosity, bulk density, particle size distribution, thixotropy and suspension percentage of slurries. The results show that the physical properties of primary slurry were mostly determined by the type and content of refractory materials. Refractory particle morphology and the particle size distribution affect slurry rheology and viscosity.

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Earnshaw, R., and E. F. Morey. "The Fit of Gold-alloy Full-crown Castings Made with Ceramic Casting Ring Liners." Journal of Dental Research 71, no. 12 (December 1992): 1865–70. http://dx.doi.org/10.1177/00220345920710120201.

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Measurements were made of the fit of gold-alloy full-crown castings produced with dry ceramic ring liners. When used with vacuum investing, these liners absorb relatively large amounts of water from the investment mix (thereby reducing its original W/P ratio) and then function as wet liners, thus increasing the investment's potential expansion and giving castings which are consistently larger than when air investing is used. With four of the five liners tested, investing in air produced many castings which were unacceptably undersized (inaccuracy worse than -0.2%). The fifth liner, an industrial material 2 mm thick, gave only one casting out of 12 which was outside this limit, although all castings were undersized to a lesser extent. Vacuum investing gave improved casting accuracy; with four of the five liners, the improvement was highly significant (p < 0.001), and with the fifth, probably significant (p < 0.05). Even with vacuum investing, however, with only two of the liners did all castings show inaccuracies within ± 0.2%. With the other three liners, some castings (ranging from 2/10 to 7/9) had inaccuracies worse than -0.2%. With both air and vacuum investing, changing from one liner to another caused changes in relative casting accuracy which were often significant (p < 0.01) or highly significant (p < 0.001). In casting techniques where a ceramic ring liner is used, the choice of specific lining material and the choice between investing in air or under vacuum are important factors which can have a major effect on the fit of castings.

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Elbanna, Noha, Adel Nofal, Abdelhamid Hussein, and Mahmoud Tash. "Mechanical Properties of Thin Wall Ductile Iron: Experimental Correlation Using ANOVA and DOE." Key Engineering Materials 835 (March 2020): 171–77. http://dx.doi.org/10.4028/www.scientific.net/kem.835.171.

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The present study was undertaken to investigate the effect of different metallurgical parameters such as casting techniques, wall thickness, inoculant technique, carbon equivalent, nodule count, ferrite and pearlite percent on the mechanical properties of thin wall ductile iron castings (TWDI). Understanding of the effect of chemistry, casting techniques, melting and molten treatment on the mechanical properties and microstructural features of TWDI castings would help in selecting conditions required to achieve optimum mechanical properties and alloy high strength to weight ratio. The use of the design of experiment (DOE) and the analysis of variance (ANOVA) can be a useful methodology to reach this objective. The analysis of the effects of each variable and their interaction on the mechanical properties of TWDI castings using green sand, green sand with insulation and investment casting techniques plays a key role in improved materials performance.The results indicate that nodule count, pearlite content and the interaction between carbon equivalent, nodule count and pearlite content have a significant effect on the tensile strength of TWDI castings. The impact toughness values decrease with smaller section thickness and increased nodule count. Using investment casting technique, decreasing the pearlite percent and nodule count, and increasing the wall thickness and ferrite percent reduce the values of ultimate tensile strength and yield strength. The results of percent elongation and impact toughness show a reverse trend compared with those of ultimate tensile strength and yield strength in terms with different metallurgical parameters.

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MORI, Toshiko, Janis MCALOON, and Farzaneh AGHAJANI. "Gypsum-bonded Investment and Dental Precision Casting (I) Two Investments." Dental Materials Journal 22, no. 3 (2003): 412–20. http://dx.doi.org/10.4012/dmj.22.412.

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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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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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Journal articles on the topic 'Investment casting'

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