加拿大外贸
fundamental foundry processesMolding
the product of the foundry is a casting. the first foundry process involved in the production of a casting is the constuction of a suiable mold. the type of mold is governed by the size and shape of the casting and the kind of metal to be used to make the castings.
Green sand moulds are made of sand in its green or natural state and may be poured with metal as soon as they are completed. About 85% of all molds made in the foundry are of green sand.
Moulding sand must be selected with great care , as much of the success or failure of casting depends on the sand mold.
Dry sand molds are made of a special mixture of sand rammed in its damp state .When the mold has been completed ,it is placed in an oven to bake. This process removes all moisture from the mold and leaves the body of the mold firm and dry .
Coremaking
Core are bodies of sand that form an opening or cavity . There are two types of cores , green sand and dry sand. The green sand core is body of sand projecting into a mold to form a cavity or opening in the casting when the metal is poured. The green sand core is formed by the pattern during the molding process.
A dry sand core is composed of a special mixture of silica sand and binding material .The core is rammed independently of the mold and bake in an oven to remove all moisture .The bake core is place in the finished mold before the mold is closed for pouring.
Metal
Metal used to form a casting must be in liquid form when it is poured into the mold. The kind of metal used will determine the type of furnace for the melting process.
Metals with low melting point ,such as as lead , tin and zinc can be melted in an iron pot over and ordinary gas burner .Aluminum , brass and bronzes require greatr heat and therefore are melted in gas-or oil-fired crucible furnaces . Cast rion require the high temperature of the coke-fired cupola furnace or the electric arc furnace . The open hearth furnace, the converter or the electeic furnace supply the high temperature necessary to metal steel.
Pouring
The process of shaping molten metal in a mold is termed casting and pouring. The liquid metal is conveyed from the furnace to the mold for this process . The containers in which the metal is carried are call ladles . The type and quantity of metal to be poured at one time will determine the kind and size of ladle used .
Cleaning and finishing castings
The solidified metal of castings is removed form the sand mold . The excess metal attached to the castings, in the form of gate sprues and rise , and any sand that might be adhering to the castings is removed in the cleaning and finishing deparment . The cleaned castings are inspected and those requiring special heat treatment are processed before they are shipped to the consumer .
THE END
[ 本帖最后由 zmf1219 于 2010-2-2 14:59 编辑 ]
评论
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评论
LZ，请标明您的意图，是求助咩，还是？？
如果是求助，请参看本版版规第2条，禁止长篇翻译。
评论
没有别的意思呀，
如果有想了解铸造英语词汇和文章的可以收藏，学习一下。
本人正在学习。
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要是多发点该多好呀 ，太少了铸造文章
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