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Cupola furnace
A cupola or cupola furnace is a melting device used in foundries that can be used to melt cast iron, ni-resist iron and some bronzes. The cupola can be made almost any practical size. The size of a cupola is expressed in diameters and can range from .〔Intelligent Control of Cupola Melting, E.D. Larsen, Et. All, Lockheed Martin Idaho Technologies Company, June 1997 ()〕 The overall shape is cylindrical and the equipment is arranged vertically, usually supported by four legs. The overall look is similar to a large smokestack.
The bottom of the cylinder is fitted with doors which swing down and out to 'drop bottom'. The top where gases escape can be open or fitted with a cap to prevent rain from entering the cupola. To control emissions a cupola may be fitted with a cap that is designed to pull the gases into a device to cool the gases and remove particulate matter.
The shell of the cupola, being usually made of steel, has refractory brick and plastic refractory patching material lining it. The bottom is lined in a similar manner but often a clay and sand mixture ("bod") may be used, as this lining is temporary. Finely divided coal ("sea coal") can be mixed with the clay lining so when heated the coal decomposes and the bod becomes slightly friable, easing the opening up of the tap holes. The bottom lining is compressed or 'rammed' against the bottom doors. Some cupolas are fitted with cooling jackets to keep the sides cool and with oxygen injection to make the coke fire burn hotter.
== History ==
Cupola furnaces were built in China as early as the Warring States period (403–221 BC),〔Pigott, Vincent C. (1999). ''The Archaeometallurgy of the Asian Old World''. Philadelphia: University of Pennsylvania Museum of Archaeology and Anthropology. ISBN 0-924171-34-0, p. 191.〕 although Donald Wagner writes that some iron ore melted in the blast furnace may have been cast directly into molds. During the Han Dynasty (202 BC – 220 AD), most, if not all, iron smelted in the blast furnace was remelted in a cupola furnace; it was designed so that a cold blast injected at the bottom traveled through tuyere pipes across the top where the charge (i.e. of charcoal and scrap or pig iron) was dumped, the air becoming a hot blast before reaching the bottom of the furnace where the iron was melted and then drained into appropriate molds for casting.〔Wagner, Donald B. (2001). ''The State and the Iron Industry in Han China''. Copenhagen: Nordic Institute of Asian Studies Publishing. ISBN 87-87062-83-6, pp. 75–76.〕〔http://donwagner.dk/cice/cice.html Cast Iron in China and Europe retrieved 2014 Dec 25〕 A cupola furnace was made by René-Antoine Ferchault de Réaumur around 1720.〔Encyclopædia Britannica〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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