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Casting process
Published in William Bolton, R.A. Higgins, Materials for Engineers and Technicians, 2020
In addition to jet-engine blades, other typical investment-cast products include special alloy parts used in chemical engineering, valves and fittings for oil-refining plant and machine parts used in the production of modern textiles; tool and die applications such as milling cutters, precision gauges, forming and swaging dies; and parts for industrial and domestic equipment, such as cams, levers, spray nozzles, food-processing plant parts, and parts for sewing machines and washing machines. The materials from which many of these components are made are extremely hard and strong over a wide range of temperatures, making it impossible or, at best, expensive to shape them by orthodox mechanical methods. Investment-casting provides a means of producing the required shapes whilst retaining the required dimensional accuracy.
Liquid Materials: Casting Processes
Published in Leo Alting, Geoffrey Boothroyd, Manufacturing Engineering Processes, 2020
Leo Alting, Geoffrey Boothroyd
The main advantages of investment casting are: the production of very complicated shapes even in high melting temperature alloys [this includes thin sections (—0.4 mm), undercuts, etc.], very fine details, exceptionally good surface finish, and very high dimensional accuracy (0.003-0.005 per dimensional unit, cm/cm).
Metal Casting I—Casting Fundamentals
Published in Zainul Huda, Manufacturing, 2018
Investment casting, also called lost-wax casting, is an expandable mold casting process that involves the use of a wax pattern that melts out (lost) during casting. In this process, first a wax pattern is coated with a refractory ceramic material that is hardened with time, and the internal geometry of the ceramic coating takes the shape of the casting (mold cavity). The mold is then inverted and heated so that wax is melted out of the cavity. Then the mold is held upright and molten metal is poured into the cavity formed due to melting of the wax. On completion of solidification within the ceramic mold, the metal casting is removed.
A review on parameters affecting properties of biomaterial SS 316L
Published in Australian Journal of Mechanical Engineering, 2022
In recent past, various additive manufacturing technologies have emerged. Some of these technologies are laminated object manufacturing, selective laser sintering, fused deposition modelling (FDM), solid ground curing, electron beam melting and poly jet technology. The major advantage of these technologies is that they avoid use of tools or die and directly convert 3D CAD model into physical model using plastic material such as polylactic acid and polyglycolic acid. Many times, plastic pattern replaces wax patterns in investment casting process by little alteration. Investment casting process is used to produce intricate shape with better surface finish and dimensional accuracy. Combining IC and FDM, different grades of austenitic stainless steel (316, 304L and 304) selected to produce hip replacement implants as shown in Figure 3.
Process parameter effects on solidification behavior of the superalloy during investment casting
Published in Materials and Manufacturing Processes, 2019
Jiangping Yu, Donghong Wang, Dayong Li, Ding Tang, Guoliang Zhu, Anping Dong, Da Shu, Yinghong Peng
Investment casting has been widely utilized to fabricate aircraft engines and gas turbine components, which are frequently employed in high temperature and harsh working conditions. Globally, the goals of lightweight and efficient are the eternal topic in the industry field that drives the design of components for aero engines and gas turbines to make more complex, thinner and thicker geometries, thus, making the investment process extremely challenging. Referable to the necessities and restrictions of the working environment, a novel K4169 Ni-based superalloy will be the suitable casting material for its capability of high strength, better corrosion resistance and excellent creep resistance under the service conditions. K4169 contains more than a dozen elements, each one governs the formation and the evolution of the microstructure at different degrees.
3D temperature mapping of a ceramic shell mould in investment casting process via infrared thermography
Published in Quantitative InfraRed Thermography Journal, 2020
Carlo Salvatore Greco, Gerardo Paolillo, Mattia Contino, Ciro Caramiello, Michele Di Foggia, Gennaro Cardone
Many items are produced by using the investment casting process such as jewellery/art castings, turbine blades and other industrial components. Turbine blades are mainly used in aero engines and gas turbines and have very 3D complex geometries. Indeed, the non-uniform thickness of airfoil, thick root, curvature and twist are critical features of these elements. Moreover, gas turbine blades have narrow dimensional and geometrical tolerances and, for all these reasons, the investment casting is the best suitable process for their production.