scholarly journals LABORATORY PROCESS FOR THE RECLAIMING OF THE CERAMICS MOLD FROM THE INVESTMENT CASTING

2013 ◽  
Vol 10 (19) ◽  
pp. 19-23
Author(s):  
Luis Alcides Brandini DE BONI ◽  
Vagner CRIVELETTO ◽  
Marcos CAMANA
Keyword(s):  
Investment Casting ◽  
Raw Materials ◽  
Casting Process ◽  
Raw Material ◽  
Ceramic Mold ◽  
Particle Sizes ◽  
Ceramic Shell ◽  
Investment Casting Process ◽  
Different Diameters ◽  
By Products

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

The Use of Local Raw Materials for the Manufacturing of Import Substitution Casting Products on Investment Casting Technology

2020 ◽  
Vol 1000 ◽  
pp. 447-453
Author(s):  
Hafid Abdullah ◽  
Sri Bimo Pratomo
Keyword(s):  
Investment Casting ◽  
Raw Materials ◽  
Import Substitution ◽  
Casting Process ◽  
Machining Process ◽  
Added Value ◽  
Casting Technology ◽  
Metal Pattern ◽  
Investment Casting Process ◽  
The Cost

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.

Enhancement of Porosity of the Ceramic Shell in Investment Casting Process Using Needle Coke and Camphor

2014 ◽  
Vol 592-594 ◽  
pp. 269-275 ◽  
Author(s):  
Khyati Tamta ◽  
D. Benny Karunakar
Keyword(s):  
Investment Casting ◽  
Complex Geometry ◽  
Gas Permeability ◽  
Ferrous Metal ◽  
Dimensional Accuracy ◽  
Casting Process ◽  
Ceramic Shell ◽  
Needle Coke ◽  
Thin Sections ◽  
Investment Casting Process

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.

scholarly journals Optimization of Ceramic Shells for Contact with Reactive Alloys

2008 ◽  
Vol 587-588 ◽  
pp. 157-161 ◽  
Author(s):  
Teresa P. Duarte ◽  
Rui J.L. Neto ◽  
Rui Félix ◽  
F. Jorge Lino
Keyword(s):  
Mechanical Properties ◽  
Surface Quality ◽  
Investment Casting ◽  
Chemical Reactivity ◽  
High Surface ◽  
Casting Process ◽  
Ceramic Shell ◽  
High Surface Quality ◽  
Complex Shapes ◽  
Investment Casting Process

Companies are continuously under pressure to innovate their products and processes. In Portugal, there are already several examples of enterprises that have chosen research groups, associated to universities, to straighten collaboration seeking the development of new materials and advanced technological processes, to produce components with complex shapes, high surface quality, and others, at low cost, for continuously more demanding applications. Unfortunately, these cases are still a very small number, and many efforts have to be done to enlarge the collaboration university-companies. Ti and other reactive alloys are important groups of metals that are under intense and continuous research and development. For example, the high mechanical properties, low density, osteointegration behavior, corrosion resistance to fluids and tissues of the human body, the ability to be sterilized, and the possibility to obtain complex shapes, makes Ti a very attractive material for medical applications. The investment casting process, using lost wax or lost rapid prototyping models, allows designers a great amount of freedom and capacity to quickly produce castings of high dimensional accuracy and excellent surface quality suitable for different applications. Many of the castings obtained by this process are immediately ready for use, avoiding costly machining operations and joining processes, making the process very attractive to produce precision parts in Ti and other reactive alloys. However, the high reactivity of the Ti raises several compatibility problems with the traditional materials employed on the ceramic shells for casting steels and non ferrous alloys. The fragile surface layer obtained on the interface Ti-ceramic shell, result of the Ti reaction with oxygen and nitrogen of the shell, significantly reduces the mechanical properties of the cast parts, making them useless. The aim of the present work is the study of the interface properties of the Ti-ceramic shell, in order to be able to manufacture ceramic shells of low chemical reactivity for the investment casting process of reactive alloys, namely; titanium alloys, inconel, aluminotitanates, and others. Ceramic shells manufactured with calcium and yttria stabilized zirconia and other non reactive ceramics were employed and the metallic interface characterized in terms of microscopic and microhardness properties.

scholarly journals Caracterización morfológica y estructural del cascarón cerámico desecho del proceso de microfundición en FASAB Sogamoso (Morphological and structural characterization of ceramic shell waste in the investment casting process in FASAB Sogamoso)

2016 ◽  
Vol 16 (1) ◽  
pp. 14 ◽  
Author(s):  
Isnardo Antonio Grandas Rincón ◽  
Luis Ángel Lara González ◽  
Ricardo Alfonso Paredes Roa ◽  
Karol Lizeth Roa Bohórquez
Keyword(s):  
Structural Characterization ◽  
Investment Casting ◽  
Casting Process ◽  
Ceramic Shell ◽  
Santa Barbara ◽  
Shell Waste ◽  
Investment Casting Process

Se reportan las características estructurales y los parámetros cristalinos del material de desecho del proceso de microfundición en la Industria Militar (INDUMIL) Fábrica Santa Bárbara. Mediante la realización de pruebas normalizadas de laboratorio, tales como microscopía óptica, microscopia electrónica de barrido (MEB) y difracción de rayos X (DRX), se identifican la distribución granulométrica, la porosidad y las fracturas presentes. Además, se realiza un análisis cualitativo y cuantitativo de las fases mineralógicas, determinando la fase mayoritaria y comparándola con las fases presentes en la materia prima original. Finalmente, con base en la información obtenida, se proponen posibles usos que pueda tener el material en estudio.

3D temperature mapping of a ceramic shell mould in investment casting process via infrared thermography

2019 ◽  
Vol 17 (1) ◽  
pp. 40-62
Author(s):  
Carlo Salvatore Greco ◽  
Gerardo Paolillo ◽  
Mattia Contino ◽  
Ciro Caramiello ◽  
Michele Di Foggia ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Investment Casting ◽  
Casting Process ◽  
Ceramic Shell ◽  
Temperature Mapping ◽  
Shell Mould ◽  
Investment Casting Process

Modification of Ceramic Mold for Investment Casting with Silica Sand as Stucco and Nylon Addition

2015 ◽  
Vol 1112 ◽  
pp. 510-514
Author(s):  
Bondan T. Sofyan ◽  
M. Syahid ◽  
Hafid. A. Khairuddin ◽  
R. Nurdin
Keyword(s):  
Investment Casting ◽  
Hardness Test ◽  
Casting Process ◽  
Silica Sand ◽  
Bending Test ◽  
Ceramic Mold ◽  
Mold Material ◽  
Alternative Material ◽  
Microstructure Examination ◽  
Investment Casting Process

The investment casting process has increasingly been used to produce components because it has the advantage to produce high precision part. One of the obstacles in the investment casting process in Indonesia is imported ceramic mold material. However, Indonesia has the potential silica sand which can be developed as an alternative material mullite . This study aims to develop local silica sand as stucco with the addition of nylon fibers in the slurry. Characterization of the ceramic material is bending test, edge test, and porosity tests that will be compared with the ceramic mold mullite-based. Characterization also conducted on casting product of aluminum impeller turbine by hardness test, microstructure examination by optical microscopy and SEM . The results showed that strength of ceramic molds made ​​from silica sand increase due to the addition of nylon but has not reached a standard ceramic strength. Ceramic mold is able to withstand the load at the time of pouring. There is not misrun in the casting product but some porosity due to low permeability.

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