Journal articles: 'Investment casting technology'

1

Suzuki, Nobuo. "Recent progress of investment casting technology." DENKI-SEIKO[ELECTRIC FURNACE STEEL] 60, no. 1 (1989): 53–58. http://dx.doi.org/10.4262/denkiseiko.60.53.

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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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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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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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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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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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Dineshraj, S., Mayukh Acharya, Alok Agarwal, S. Girikumar, Govind, S. C. Sharma, and Koshy M. George. "Development of Hot Isostatic Pressing Technology for Investment Cast Products." Materials Science Forum 830-831 (September 2015): 19–22. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.19.

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Hot isostatic pressing (HIPping) technology is used for healing the casting defects for aerospace applications. Castings used for aerospace applications like turbo-pumps need to meet very stringent quality requirements. Complexity of the castings used in these applications, makes it difficult to meet the quality requirements in all the areas. Defects like gas holes, shrinkages, cavities etc. may occur in few locations and need to be repaired by welding or healed by HIPping. In the present study, we attempted to simulate the defect healing capability of HIP in a systematic manner. Artificial defects were created in Austenite-Martensite grade stainless steel cast rod. These rods were then subjected to HIP prcoss cycle at 1150 °C and at a pressure of 1620 bar. Healing of the defects was ensured through X-ray radiography. Detailed microstructural analysis using optical metallography and scanning electron microscopy (SEM) with EDX was carried out before and after HIPping, to understand the defect healing mechanisms. These results are discussed in detail here.

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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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Yang, Jinsong, Yusheng Shi, Qiwen Shen, and Chunze Yan. "Selective laser sintering of HIPS and investment casting technology." Journal of Materials Processing Technology 209, no. 4 (February 2009): 1901–8. http://dx.doi.org/10.1016/j.jmatprotec.2008.04.056.

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10

Hafid. "Research on the Manufacturing of Steam Turbine Blade by Using Investment Casting Technology." Advanced Materials Research 789 (September 2013): 330–40. http://dx.doi.org/10.4028/www.scientific.net/amr.789.330.

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This paper presents the results of research on the manufacturing of steam turbine blade by using investment casting technology. Metal forming technology with precision casting process or investment casting is the right technology for the manufacture of turbine blades, because it can produce casting products that has advantages in size and shape accuracy, surface finish and the ability to produce thin casting, which the usually foundry can not be done. The purpose of this research is to produce a good quality of the casting products as an effort to reduce import dependency of steam turbine blade and to be the alternative way of making steam turbine blades in Indonesia, in addition to the machining process. Based on the experimentation trial implemented on casting products of stainless steel 304, the result indicates that the injection temperature for the wax NF-411 and optimal nozzle in hydraulic injection machine are 64°C and 30°C, injection pressure 1.75 MPa and injection time 9 seconds. The best casting induction furnace achieved at temperature 1,620°C as for to the number of ceramic mould coat which is good to be obtained at 7 layers. The testing results show that: (1) the chemical composition is appropriate with standard, (2) the hardness is 160 HB, (3) the shrinkage is 2.83%.

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Mukhtarkhanov, Muslim, Asma Perveen, and Didier Talamona. "Application of Stereolithography Based 3D Printing Technology in Investment Casting." Micromachines 11, no. 10 (October 19, 2020): 946. http://dx.doi.org/10.3390/mi11100946.

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

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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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13

Jin, Wen Zhong, Wei Zhang, Ting Ju Li, and Guo Mao Yin. "Study of the Grain Refinement Technology by Electromagnetic Stirring for IN100 Superalloy Vacuum Investment Casting." Advanced Materials Research 189-193 (February 2011): 3789–94. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3789.

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The effects of rotating electromagnetic stirring and inoculants on the solidification structures and properties of IN100 superalloy vacuum investment casting was studied with XRD, SEM and optical microscope. The results show that by initiating the 50Hz, 150A rotating electromagnetic stirring as soon as the molten metal was poured into the mould, which was coated with inoculant CoAl2O4, the average equiaxed grain size of IN100 superalloy vacuum investment casting can be refined to 95μm and the fraction of equiaxed grains can be increased to 99 %. On condition that the grain size of K417 superalloy vacuum investment casting were refined to 95μm, the tensile properties at room temperature, the morphology of （γ＋γ′）eutectic and the morphology of dendrites can be greatly improved.

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Leushin, I. O., V. A. Ul’yanov, and L. I. Leushina. "Predicting gas-defect formation on changing the investment-casting technology." Steel in Translation 43, no. 11 (November 2013): 681–83. http://dx.doi.org/10.3103/s0967091213110119.

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Ji, Xiao-yuan, Hu Ye, Jian-xin Zhou, and Wei-lin Deng. "Digital management technology and its application to investment casting enterprises." China Foundry 13, no. 5 (September 2016): 301–9. http://dx.doi.org/10.1007/s41230-016-6011-0.

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16

Song, Ling Hui, Shou Ren Wang, Ying Zi Wang, Pei Long Song, and Guang Ji Xue. "The Wear Behavior of Shots Impeller Pair in Shot Blast Cleaning." Applied Mechanics and Materials 364 (August 2013): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amm.364.37.

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This article discussed the compound impact-abrasive wear behavior of shots impeller pair in shot blast cleaning. The shots impeller pairs were fabricated by investment casting processing. The predominance and shortcoming of investment casting for high chromium wear resistance materials used in shot blasting machine were also analyzed. Using investment casting technology, the high-Cr iron casting would be improvement in interal and explicit quality. And, owing to different included angles of shots, the blade show different wear behavior. The ideal included angle of shots is 12o. Increase in the angles leads to decreases of the wear resistance.

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17

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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Li, Ji Gao, Yuan Cai Li, and Li Chi Wang. "Study on Technology of Iron Removal during Recycling of Shell of Investment Casting." Advanced Materials Research 634-638 (January 2013): 3181–84. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3181.

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Recycling of the shell of investment casting is meaningful. However，there are many factors which hamper the progress of this work, and one of these is that the Fe content is difficult to reach the standard under the present technological conditions. Through investigating and analyzing the sources of Fe in three factories which produce steel casting and a factory which is engaging in recycling of the shell of investment casting, a new idea which suggested to remove iron through controlling import of Fe form sources was put forward in this paper. To realize this idea, corresponding measures was suggested, such as classifying the shell, picking iron out manually, storing the shell appropriately, and selecting reasonable equipment for recycling processing.

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Stachovec, I., M. Horáček, L. Zemčík, V. Kolda, and J. Horenský. "Gating Systems for Sizeable Castings from Al Alloys Cast into Ceramic Moulds." Archives of Foundry Engineering 12, no. 2 (April 1, 2012): 65–68. http://dx.doi.org/10.2478/v10266-012-0038-5.

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Gating Systems for Sizeable Castings from Al Alloys Cast into Ceramic Moulds In contrast to casting to conventional non-reusable "sand" moulds, for which calculating technique for an optimum design of the gating system is comparatively well-developed, a trial-and-error method is applied mostly for casting to ceramic shell moulds made by the investment casting technology. A technologist selects from gating systems of several types (that are standardized by the foundry mostly) on the basis of experience. However, this approach is not sustainable with ever growing demands on quality of castings and also the economy of their fabrication as well as with new types of complex sizeable castings introduced to the production gradually (by new customers from the aircraft industry above all) any more. The simulation software may be used as a possible tool for making the process of optimising gating systems more effective.

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20

Znamenskii, L. G., O. V. Ivochkina, and A. S. Varlamov. "Acceleration of the Formation on the Sodium Silicate Binder in Investment Casting." Materials Science Forum 946 (February 2019): 673–77. http://dx.doi.org/10.4028/www.scientific.net/msf.946.673.

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For cost reduction of the molds manufacturing, as well as environmental load in foundries sodium silicate binder is often used. However, without treatment with special compositions that accelerate curing and improve their properties, sodium silicate molds have insufficient thermal spalling resistance and often cause the rejection of castings made of heat-resistant alloys. As a result of the research, there was developed a technology of chemical drying of the sodium silicate cover layers in investment casting with the use of aluminoborbophosphate concentrate. It allows to reduce the production time of ceramic molds by 2...3 times, as well as to increase their strength either before baking or after it by 20...25 %. At the same time, as a result of softening effect of aluminoborbophosphate concentrate after baking and cooling of the specimens there has been observed a significant reduction of their retained strength and, as a consequence, better knockout of fire-resistant shells. Industrial tests of the sodium silicate cover chemical drying showed a significant reduction of the investment castings rejection due to the insufficient thermal spalling resistance and the reduction of the cleaning processing time of casting made of heat-resistant alloys.

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Nikitin, K. V., A. V. Sokolov, V. I. Nikitin, and V. N. D’yachkov. "Application of Recycling Products of Aluminum Slags in Investment Casting Technology." Russian Journal of Non-Ferrous Metals 60, no. 1 (January 2019): 41–51. http://dx.doi.org/10.3103/s1067821219010103.

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Westlake, Will. "Dry vacuum pumping technology outperforms oil-sealed pumps for investment casting." Vakuum in Forschung und Praxis 11, no. 3 (1999): 162–63. http://dx.doi.org/10.1002/vipr.19990110309.

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23

Vrátný, Ondřej, and Aleš Herman. "IMPORTANCE OF A TYPE OF GATING SYSTEM IN INVESTMENT CASTING TECHNOLOGY." Acta Polytechnica 59, no. 6 (December 31, 2019): 601–10. http://dx.doi.org/10.14311/ap.2019.59.0601.

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At present, there is an increasing demand for the Investment casting technology. It is necessary to ensure their dimensional accuracy as well as internal quality and their desired macrostructure and microstructure. This paper deals with the issue of filling ceramic shells and their influence on the occurrence of oxide inclusions. The aim is to compare several proposed ceramic systems with top and bottom filling of a shell consisting of 4 blades and a gating system in terms of turbulence and monitoring of the contact line between the melt and the surrounded air.

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Ying, Zhang, and Chowdhury Satyajit. "Study on Rheological Properties of Silica Sol in Sisal Fibber Reinforced Investment Casting." Key Engineering Materials 852 (July 2020): 180–88. http://dx.doi.org/10.4028/www.scientific.net/kem.852.180.

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In casting temperature Laquan silica sol crust process suitable for the production of surface roughness is small, precision high accuracy in size, and has become the mainstream technology has been widely used. Silicon sol casting with high dimensional accuracy, good surface quality and other advantages, is a widely used less advanced technology without cutting, using silica sol casting method can save a lot of machine equipment and processing time, but also greatly saves metal materials. Hard fiber sisal has high tensile strength, resistance to seawater immersion, friction resistance, flexibility and other characteristics, can be used for fishing, sailing, mining, transportation rope, canvas, waterproof cloth and other raw materials. The most commonly used binder in investment casting is silica gel solution (abbreviated as silica sol), such as ethyl silicate hydrolysate, water glass and silica sol.

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Cheng, Rong. "The Application of Feature Mapping in Model Transformation of Turbine Blade." Applied Mechanics and Materials 20-23 (January 2010): 898–904. http://dx.doi.org/10.4028/www.scientific.net/amm.20-23.898.

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A transformation technology for part model to blank model based on feature mapping of turbine blade was prompted to improve the design efficiency of investment casting mold. The definition, feature presentation and feature mapping theory were researched. The feature and the geometry structure of turbine blade’s part mold, blank model and cavity mold were analyzed, and the feature mapping technology was prompted. At last, a mold transformation system was developed based on UG. Experiment result shows that with the help of this system, designers can improve design efficiency of investment casting mold of turbine blade.

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Chen, Yu Yong, Yan Fei Chen, Shu Long Xiao, Fan Tao Kong, Jing Tian, and Li Juan Xu. "Research on the Hot Precision Processing of TiAl Alloys." Materials Science Forum 620-622 (April 2009): 407–12. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.407.

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γ-TiAl components due to their unique properties are on the verge of industrial application for increasing operation temperature and improving energy efficiency, especially in aerospace and automobile areas. This paper describes the recent developments of hot precision processing in ingot metallurgy technology including investment casting, canned forging and sheet rolling of TiAl alloys. Alloys development and the melting technology were discussed. Investment casting of TiAl alloys has been successfully developed to manufacture net-shape components. Research aimed at producing TiAl sheets through canned forging and rolling is introduced.

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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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Cygan, R., D. Szeliga, P. Rokicki, J. Sieniawski, and J. S. Suchy. "The Control of Solidification Kinetics of the Vacuum-cast Thin-wall Nickel-based Superalloys by Changing the Geometrical Characteristics of the Ceramic Mold." Archives of Foundry Engineering 13, no. 4 (December 1, 2013): 21–28. http://dx.doi.org/10.2478/afe-2013-0076.

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Abstract This paper provides an analysis of experimental research and results of investment casting process. Temperature field in a ceramic mold is one of the problems during numerical simulation. Reducing the costs of production in precision casting involves the reduction of scraps, which is one of the fundamental problems of the foundry industry. Reducing these costs is associated with optimization of precision casting technology of aircraft engines critical parts, including control of the solidification front in thin-walled castings of nickel super alloys cast in a vacuum. It is achieved by changing the geometrical characteristics of the ceramic mold. The results of the tests were used to optimize the industrial production of aircraft components in Precision Foundry of WSK Rzeszów. Temperature distribution gained in the conducted tests allowed verification and optimization of computer simulations.

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Kolczyk, J., Ł. Jamrozowicz, and N. Kaźnica. "Rheological Properties of Typical Ceramic Slurries Used in the Lost Wax Technology." Archives of Foundry Engineering 17, no. 1 (March 1, 2017): 197–201. http://dx.doi.org/10.1515/afe-2017-0035.

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Abstract The results of investigations of the rheological properties of typical ceramic slurries used in the investment casting technology - the lost wax technology are presented in the paper. Flow curves in the wide range of shear velocity were made. Moreover, viscosity of ceramic slurries depending on shearing stresses was specified. Tests were performed under conditions of three different temperatures 25, 30 and 35°C, which are typical and important in the viewpoint of making ceramic slurries in the investment casting technology. In the light of the performed investigations can be said that the belonging in group of Newtonian or Non - Newtonian fluid is dependent on content of solid phase (addition of aluminum oxide) in the whole composition of liquid ceramic slurries.

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Huang, Pei Hsing, and Yu Ting Chen. "The Applications of Mold Flow Analysis on Vibration Separation Technologies of Investment Casting Components." Applied Mechanics and Materials 472 (January 2014): 699–703. http://dx.doi.org/10.4028/www.scientific.net/amm.472.699.

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Conventionally, the investment casting components were separated from the casting pattern tree via a grinding machine to cut off ingate/inlet of the gating system. This post-treatment process may considerably increase labor and material costs. In this paper, a fatigue damage technology was proposed to separate the components in substitution for the cutting operation of traditional grinding machines. Mold flow analyses were conducted in the design of the gating system to ensure the casting quality. An actual vibration experiment of the casting pattern tree was conducted, and the results verified that the substitutive scheme is feasible.

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Chen, Yan Fei, Yuong Chen, Jiang Ping Tu, and Shun Qi Zheng. "Interactions between TiAl and ZrO₂ Face Coat during Centrifugal Investment Casting." Advanced Materials Research 1044-1045 (October 2014): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.59.

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γ-TiAl alloys are emerging as potential light-weight, high-temperature structural materials and possess wide capacities of engineering applications in aeronautics, space and automobile industries because of their low density, high specific strength and specific modulus, good oxidation-resistance and creep-resistance. Investment casting is introduced to complex TiAl net-shape or near net-shape components. In this research, ZrO2 (CaO stabilized) was chosen as the face coat materials for the investment casting of TiAl alloys. The present study mainly focuses on the fabrication of ceramic shell mould for TiAl investment casting. Optimisation of reducing the stress in cast-mould system was carried out. The processing technology of the invented ceramic shell moulds was successfully verified in the investment casting of prototype TiAl parts. The interfacial reaction between TiAl alloys and ZrO2 ceramic mould was analyzed using OM, SEM, EDS and XRD. The experimental results showed that, when the rotation speed is 200 rpm and 400 rpm, the thickness of reaction layer is about 5μm and 20μm, respectively.

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Lee, Wei-Hao, Yi-Fong Wu, Yung-Chin Ding, and Ta-Wui Cheng. "Fabrication of Ceramic Moulds Using Recycled Shell Powder and Sand with Geopolymer Technology in Investment Casting." Applied Sciences 10, no. 13 (July 1, 2020): 4577. http://dx.doi.org/10.3390/app10134577.

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Lost-wax casting, also called precision casting, is the process of casting a duplicate metal sculpture cast an original sculpture. The ceramic shell mould used in lost-wax casting usually consists of several layers formed with fine zircon and granular mullite particles using silica gel as a binder. However, it is a complicated and time-consuming process. Large amounts of waste moulds that need to be disposed and recycled become an environmental concern. In this study, waste shell sand from the recycled mould and calcium carbonate/metakaolin were used as raw materials to prepare geopolymer slurry and coating. The influence of mixing ratio and the SiO2/K2O modulus of the alkali solution on the setting time and green/fired strength were evaluated. Ceramic shells with one to four layers of geopolymer slurry and waste sand sprinkling were fabricated and tested for their permeability and green/fired strength. It was found that geopolymer shells had higher green/fired strength and better permeability than the original zircon/mullite shell. For foundry practice, metal casts were fabricated using recycled ceramic shell moulds with one to four layers of geopolymer coating. All cast results have their dimensions all within tolerance limitation and up to 13 h can be saved for the preparation of shell moulds.

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Znamenskii, L. G., O. V. Ivochkina, and A. S. Varlamov. "Accelerated Forming on the Sol-Silicate Binder in Precision Casting." Solid State Phenomena 284 (October 2018): 1273–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.1273.

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As a result of the research, the technology of accelerated forming on the sol-silicate binder in precision casting has been developed. It is based on granular materials cladding by the gel-processing catalysts of the sol-silicate binder and on the use of the clad granular materials as the stucco of ceramic coating layers. That allows to achieve a reduction of ceramic molds product cycle of more than 2...2.5 times and strength improvement of 1.4...1.5 times at the temperature of baking. The developed technology allows to improve the quality of ceramic molds and significantly shorten the forming cycle. Production tests of the gel-processing clad stucco in the investment casting showed a significant reduction of the reject precision castings, acceleration of ceramic molds production and a reduction of the working hours on removing "wedged" ceramic from less-accessible cast section cavities of the pump parts from complex alloyed steels.

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Ablyaz, T. R., A. A. Shumkov, and K. R. Muratov. "Studying the Technology of Creating Cortical Electrode Instruments using the Rapid Prototyping Technology." Archives of Foundry Engineering 17, no. 2 (June 27, 2017): 157–61. http://dx.doi.org/10.1515/afe-2017-0068.

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Abstract This paper shows the results of studying the technology of manufacturing cortical electrode-instruments (EI) with the use of indirect methods of the Rapid Prototyping technology. Functional EI prototypes were made by layered synthesis of the photopolymer material with the use of the stereolithography technology (SLA - Stereo Lithography Apparatus). The article is focused on two methods of indirect EI manufacturing. One of the EI prototypes was used for making a molded wax model for hot investment casting, followed by applying copper coating. The second prototype was used for applying copper plating to a prepared current-conductive layer. As a result of EDMing a steel workpiece, both EIs reached the desired depth, which is 1 mm. The copper plating applied to the EI preserves its integrity. Through the use of the casting technology, there is a possibility to cut the economic costs by 35%. Using a prototype with preliminarily applied conductive coating makes it possible to make geometrically-complex EIs.

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Tkachenko, S. S., V. O. Yemelyanov, and K. V. Martynov. "Modern materials and technologies in the production of artificial casting." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 3 (September 10, 2021): 78–81. http://dx.doi.org/10.21122/1683-6065-2021-3-78-81.

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The publication highlights the production of artistic castings by investment casting using combined ceramic molds. The features of the application of a refractory coating, duplex curing of ceramic shells, cutting of molds, removal of the model composition, annealing of ceramic molds, pouring and separation of the gating‑feeding system under conditions of mass production are considered. Hydrolyzed ethyl silicate (ETS) and aqueous alkaline silica sol are used as a binder. The hydrolysis is carried out with an acidic catalyst. The strength of forms on an aqueous binder before calcination (bending strength σi) is from 1.5 to 2 MPa. The presented technology allows flexible coverage of the entire range of art products. Castings weighing from 5 to 10 kg can be produced in one batch, which significantly reduces the production cycle.

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Leushin, I. O., V. A. Ulyanov, and L. I. Leushina. "FORECASTING THE FORMATION OF GAS-RELATED DEFECTS WHEN MODIFYING THE INVESTMENT CASTING TECHNOLOGY." Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 56, no. 11 (March 26, 2015): 16. http://dx.doi.org/10.17073/0368-0797-2013-11-16-19.

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Jiang, K., Y. Guo, D. L. Bourell, W. Zeng, and Z. Li. "Study on Selective Laser Sintering of Eucalyptus/PES Blend and Investment Casting Technology." Procedia CIRP 6 (2013): 510–14. http://dx.doi.org/10.1016/j.procir.2013.03.039.

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Li, Yanfen, Xiangdong Liu, Kai Lű, and Xiaodong Du. "Preparation of Fiber-Reinforced Shell by Airflow Placement Fiber Technology for Investment Casting." International Journal of Metalcasting 13, no. 4 (March 29, 2019): 979–86. http://dx.doi.org/10.1007/s40962-019-00323-2.

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Omar, M. F. M., S. Sharif, M. Ibrahim, H. Hehsan, M. N. M. Busari, and M. N. Hafsa. "Evaluation of Direct Rapid Prototyping Pattern for Investment Casting." Advanced Materials Research 463-464 (February 2012): 226–33. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.226.

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The ability of rapid prototyping (RP) technology to fabricate direct part of any complex shape as a sacrificial pattern in shorter lead time has benefited the foundry industries significantly. The quality of investment casting (IC) parts is directly related to the master pattern fabricated from RP process. The main objective of this study was to evaluate the quality characteristics of various RP patterns that were fabricated by various RP processes which include 3D Printer (3DP), Fused Deposition Modeling (FDM) and Multijet Modeling (MJM). Evaluation of the RP patterns was carried out on dimensional accuracy, surface roughness and pattern shrinkage. Different internal pattern designs for the RP parts were developed using Insight software for FDM process and Solidworks 2011 for other RP systems. In addition to the quality assessments, the effect of the internal pattern designs on the burn out behaviour of the RP patterns was also evaluated. Experimental results showed that FDM and MJM produced patterns with better accuracy, surface roughness and part shrinkage when compared to 3DP. It was evident that the internal pattern structure improved the accuracy of the patterns produced from all RP processes. Results showed that FDM and MJM processes were superior in terms of mold cleanliness when no residual ash was observed during the burn out stage. Significant oxidation of ceramic powder was observed on the molds of the 3DP patterns which need to be removed manually from the molds.

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Akhlaghi, Farshad, and Amir H. S. Farhood. "Characterization of Globular Microstructure in NMS Processed Aluminum A356 Alloy: The Role of Casting Size." Advanced Materials Research 264-265 (June 2011): 1868–77. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1868.

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Semi-solid processing (SSP) technology, due to its ability to provide near-net-shape components with properties far exceeding those of other casting technologies is considered as an alternative for forgings and investment castings. Conventional semi-solid forming, involving the use of heated billets, melt stirring or using cooling slopes require many processing steps and supplementary equipments. This article describes Narrow Melt Stream (NMS), as an alternative process for semi-solid processing of aluminum alloys that eliminates capital cost expenditures, reduces the number of steps required, and hence reduces the costs of making components with a globular structure. However, the applicability of this technique in producing globular structures in the large molds has not been explored. In the present study the results of a systematic investigation on the effects of mold size on the size and morphology of the globular structures formed by NMS processing of Al 356 alloy is reported. For this purpose, five different series of molds were employed. Each series consisted of three molds with identical volumes but different casting moduluses. By using these molds, the effects of casting modulus at constant casting size as well as the effect of casting volume on the size and shape factor of the globular structures in aluminum A356 samples prepared by NMS technique is reported.

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Brůna, Marek, and Anna Remišová. "Flap casting of turbine engine optimization by numerical simulation." MATEC Web of Conferences 157 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201815702005.

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Submitted article focuses on possibilities of increasing internal quality of flap casting of turbine engine produced by investment casting technology. Material porosity will be eliminated by altering the gate system. ProCast software has been used to evaluate and analyse the design of the flap. The aim of the research was to evaluate the porosity of the cast after its solidification, the flow velocity of the melted material and visualise the turbulence of the flow during casting. Main aim will be to observe and analyse velocity, flow, turbulences, solidification and internal porosity for nickel based alloy.

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Davies, Huw, and Alastair Clarke. "Design and manufacture of components for motor sport using computer-aided design and rapid casting technology." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 12 (February 26, 2013): 2751–61. http://dx.doi.org/10.1177/0954406213479079.

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That motor sport is synonymous with advanced manufacturing is probably true of the upper echelons such as F1, WRC and ALMS. However, at privateer level, many of the advanced manufacturing technologies, and to an extent many of the more traditional manufacturing technologies, are beyond reach due to a combination of cost and low production volumes. One technology that has the potential to make the transition from the upper echelons to the privateer level is rapid casting technology. Rapid casting combines the advantages of traditional casting, including greater flexibility during the design stage and a more effective structural behaviour, with the requirement for low production numbers synonymous with motor sport. The low-volume element is achieved through the use of rapid prototyping technology to fabricate the high quality and complex patterns used in investment casting with lower cost and shorter leading times. A potential application was investigated through the presented case study. This involved the use of rapid casting, based on the direct rapid prototyping approach, to design and manufacture an upright for a single-seater race car. The use of advanced computer-aided design/computer-aided manufacture techniques and rapid casting technology resulted in an upright that is structurally efficient (<160 MPa main load cases), has low weight (∼900 g) and a reduced number of component parts.

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Aguilar, Julio, Andre Schievenbusch, and Oliver Kättlitz. "Qualification of a Casting Technology for Production of Titanium Aluminide Components for Aero-Engine Applications." Advanced Materials Research 278 (July 2011): 563–68. http://dx.doi.org/10.4028/www.scientific.net/amr.278.563.

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Actual alloy and process development for high temperature turbine applications in the aerospace sector is strongly aimed at reaching the high demands on reduction of CO2 emissions responsible for the green house effect. Based on weight reduction the main objective resides in improving engine performance and efficiency. Last generation intermetallic titanium aluminides (γ TiAl) have a big potential to reach this goals. γ TiAl is nevertheless a very demanding material requiring very sophisticated processing routes. Access has developed a casting route for production of high quality γ TiAl components based on skull induction melting (SIM) and centrifugal investment casting. Although the feasibility of the technology has been already proven in earlier projects, it is still necessary to improve the process for series production of parts with the high quality standards required by the aerospace industry. With aid of a new developed centrifugal casting facility Access and its partners are conducting a comprehensive qualification process for the production of aerospace components, e.g. low pressure turbine blades. Basic issues comprising casting cluster design based on numerical simulation, process control and quality management are being addressed.

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Zhu, Xintao, Fu Wang, Dexin Ma, and Andreas Bührig-Polaczek. "Dimensional Tolerance of Casting in the Bridgman Furnace Based on 3D Printing Techniques." Metals 10, no. 3 (February 25, 2020): 299. http://dx.doi.org/10.3390/met10030299.

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In this article, the feasibility and the dimensional accuracy based on the 3D printing technology during investment casting of non-vacuum and Bridgman furnace are investigated based on the coordinate measuring machine to calculate the dimensional tolerances through a systematic approach. The research proved that both the investigated RC solutions are effective at obtaining cast technological prototypes in short times and at low cost, with dimensional tolerances that are completely consistent with metal casting processes.

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Zych, J., J. Kolczyk, and T. Snopkiewicz. "Investigations of Properties of Wax Mixtures Used in the Investment Casting Technology – New Investigation Methods." Archives of Foundry Engineering 12, no. 3 (September 1, 2012): 133–38. http://dx.doi.org/10.2478/v10266-012-0096-8.

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Abstract The results of testing of the selected group of wax mixtures used in the investment casting technology, are presented in the paper. The measurements of the kinetics of the mixtures shrinkage and changes of viscous-plastic properties as a temperature function were performed. The temperature influence on bending strength of wax mixtures was determined.

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Dementyeva, J. N., R. N. Kashapov, N. F. Kashapov, and L. N. Kashapov. "Disadvantages of the selective laser sintering technology in the manufacture models for investment casting." IOP Conference Series: Materials Science and Engineering 570 (August 15, 2019): 012015. http://dx.doi.org/10.1088/1757-899x/570/1/012015.

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Wang, Songhao, and Joseph D. Millogo. "Phase Changing Material Used with RP Technology in Quick Wax Molding for Investment Casting." Computer-Aided Design and Applications 9, no. 3 (January 2012): 409–18. http://dx.doi.org/10.3722/cadaps.2012.409-418.

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Nadolski, M., Z. Konopka, M. Łągiewka, and A. Zyska. "The Influence of Benzoyl Peroxide on Gelation Rate of Silica Binder for Precision Casting." Archives of Foundry Engineering 13, no. 2 (June 1, 2013): 99–102. http://dx.doi.org/10.2478/afe-2013-0045.

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Abstract Substituting of ethyl silicate with ecologic sols of colloidal silica in the investment casting technology, resulting from the increased demands concerning environmental protection, caused the prolongation of production cycle for precision castings produced in multi-layer thin-walled ceramic shell moulds. Modification of Sizol 030 binder with benzoyl peroxide, proposed in the paper, was aimed at restriction of time needed for realization of a single layer of the shell mould, and by the same, of such a mould as a whole. Examination of kinetics of the drying process were held for the layers made of prepared moulding material and the influence of binder modification on the mould curing time was determined.

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Marutani, Yoji, Takayuki Kamitani, and Masuyoshi Tomita. "Selection of Binder Materials for Salt Powder Lamination." Materials Science Forum 475-479 (January 2005): 2909–12. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2909.

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A new technology for manufacturing expandable salt patterns to fabricate metallic parts by investment casting is presented and the results of experiments are reported to find out the binder substances suitable for the method. Solid models made by this method are also reported.

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Freitag, Lisa, Stefan Schafföner, Nicole Lippert, Christina Faßauer, Christos G. Aneziris, Claudia Legner, and Ulrich E. Klotz. "Silica-free investment casting molds based on calcium zirconate." Ceramics International 43, no. 9 (June 2017): 6807–14. http://dx.doi.org/10.1016/j.ceramint.2017.02.098.

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Journal articles on the topic 'Investment casting technology'

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