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The nameReverberatory and Puddling


By injectionmould, 2019-08-23

InMetal Casting, the type of furnace you have at your foundry, or workshopdetermines a lot of the work you can or can not do. Many metal casters enjoy makingtheir own furnaces and have done so quite successfully. The plans for home madefurnaces are eagerly shared among the enthusiasts so finding blueprints andinstructions should not be difficult. But before you rush off to find theblueprints you may want to take time to learn about the types of castingfurnaces available to help determine which one will suit your needs. This isnot saying that you should only have one furnace at any given time, but thisway you will know what project will work best for which furnace.CupolaCupola furnaces are among the most popular with backyard foundries. Manycasters construct their own cupola which proves to be cost effective and highlyefficient if done properly. Since cupola furnaces can achieve high melting temperaturesthey are primarily used for the melting of iron and bronze, though aluminum canalso be melted when attention is paid to keeping the temperature low. Theprimary fuel source for cupola furnaces are coke using limestone for flux.By not using a crucible, the Cupola furnace is able to melt the metal at afaster rate. While individual designs of these furnaces differ due to varyingresources and design ideas, the basic component of a cupola furnace is thesame. The cupola furnace must be elevated above the ground and installedwith a drop bottom usually hinged, which will allow the excess metal, fuelsource, and other waste to drop from the furnace. The tap hole and shaft whichwill allow the molten metal to flow from the furnace and into the ladle and airshafts are also required.  A slag tap hole can be placed on the furnaceusually in the back, higher then the tap hole, which will allow the slag toflow out easily.With most small home foundries, the cupola furnaces are preferred over that ofother furnaces for its high melting rates and for how easily the constructionof such a furnace can be.ReverberatoryThe Reverberatory Furnaces are commonly found in industrial plants but therehave been quite a number of home grown foundries that have used this furnacetype with much success. The basic idea of a Reverbeatory Furnace is to use theheat reflecting off a surface, usually brick, to heat the metal, which isaluminum in most cases. This way, the metal does not come into contact with thefuel or the flame. This process is also used in Puddling Furnaces. The nameReverberatory and Puddling are often used interchangeably. By placing the metalin a shallow depression and then directing an intense flame over thatdepression and to the wall, the heat rebounds to melt the metal. Many casterswill adjust the length of the flame since a longer path will mean that the heatwill be more intense.There are many designs for the reverberatory furnace, all of which will includeexhaust ports and the rear of the furnace must be able to withstand the intenseheat and be able to bounce it back into the chamber.Bronze, aluminum, tin, and many other ores can be melted in a reverberatoryfurnace all depending on the construction of the actual furnace and the heat ofthe flame. This type of furnace has been around since at least the Middle Agesand was used primarily for bronze work.Electric ArcElectric Arc furnaces are normally used in Industrial foundries. Most hobbycasters do not use these furnaces due to cost, space issues, and a generalinconvenience. There are two forms of the electric arc furnace, the direct andindirect.The direct arc has three electrodes which are used to heat metal by way of thearc. This creates an incredible amount of heat and so water jackets and othercooling devices will be needed for operation.The indirect arc just uses one electrode and works in much the same way as thedirect arc furnace.Electric InductionElectric Induction furnaces are becoming all the more Metal casting Factory popular with largeindustrial size foundries that enjoy the clean burning and efficiency of anelectrical furnace. Copper coils surround the crucible with the metal insidewhich can reach extremely high temperature suitable for melting most metals.RotaryThe Rotary style furnaces are hailed for their ease of use being fully or atthe very least partially automatic. These furnaces tend to be harder toconstruct though there are resources and companies online that sell rotaryfurnace.The different furnace types do affect the quality of the work being produced,so it is important to keep that in mind as you cast. With a little trial anderror, you should find the perfect furnace to fit your needs so you can startbuilding one of your very own.

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