关于熔模铸造工艺

ivybobo · 发表于 2009-11-3 16:04:24

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请问各位，哪里可以找到熔模铸造的英语相关介绍啊相关词汇，文章，工艺介绍都可以的我是新手刚刚接触铸造行业，翻译起来很不顺手，生怕出现错误，希望各位有经验的帮帮忙啦，谢谢大家！！

lionwww · 发表于 2009-11-4 00:07:01

这个英文资料到处有，而且非常之专业

。任何一个能模拟消失模铸造工艺的铸造CAE软件帮助文档里都有详细叙述。下面我贴一段magma对消失模铸造工艺的介绍。

lionwww · 发表于 2009-11-4 00:11:03

The Lost Foam Casting process (LFC) is the process that uses foamed polymer models to represent
the casting and parts of the gating system. Because the polymer models are destroyed during
this process, you will also find the term "Expendable Pattern Casting (EPC)" or the German term
"Vollformgießen".
Within the Lost Foam Casting process, the models are typically made of foamed expandable polystyrol
(EPS), of foamed expandable polymethylmethacrylat (PMMA) or of a foamed co-polymer of
EPS and PMMA. The models are created in permanent molds on automatic foaming machines,
with a predefined thickness. By glueing simple models together, model segments are then combined
to complex models. After that, several models are often combined to model trees. After attaching
the gating system, the model is coated by a fire resistant, anorganic coating and
embedded into compressed sand that is free from binding agents.
Within the actual casting process, the metal melt replaces the polymer model. The foam is being
pyrolized by the high melt temperatures (exchanged mainly by accompanying radiation), and the
liquid metal fills the resulting cavity.
A couple of decomposition products, like CO2, CO and several organic compounds, are created
by the pyrolysis reaction. Depending on the melt temperature, these are either mostly liquid or
mostly gaseous products. If aluminium alloys are casted with Lost Foam Casting, there are more
liquid pyrolysis products (due to the lower melt temperatures) than in the case of iron or steel castings,
where the pyrolysis reaction produces mainly gases.
The emission of the pyrolysis products usually penetrates through the coating into the sand mold.
The coating consequently plays a vital role in controlling the filling pattern of mold filling, apart from
the tasks of enhancing the casting's surface quality and stabilizing the sand mold.
Liquid decomposition products, which are created during the Lost Foam process of aluminium
casting, are absorbed by the coating in a first decomposition phase (primary pyrolysis). In a second
decomposition phase (secondary pyrolysis), the liquid products are further decomposed into
gas. These are then absorbed by the surrounding mold material.
On the other hand, during the Lost Foam casting of iron and steel, the gaseous decomposition
products immediately develop due to the higher melt temperatures. The pyrolysis gases form a
gap between the melt surface and those parts of the foam model that has not yet collapsed. Thereupon
the gases also pass through the coating into the surrounding mold material, where they finally condense. While the mold sand heats up more and more, a secondary pyrolysis starts here,too.
Obviously, a certain porosity and gas permeability of the coating is vital for the application in the
Lost Foam Casting process. Unsatisfactory gas permeability results in the formation of gas entrapments
and porosities. An unsatisfactory absorption of liquid products leads to wrinkles, cold
shuts and entrapment errors, if the liquid polymers remain in front of the metal front. Moreover,
the liquid products do not penetrate deep into the mold material; due to their high viscosity, they
concentrate on the surface. This can lead to a "closing" of the pores, so that the venting is no longer
guaranteed.
During the compaction of the mold sand, one must ensure a compaction of the mold material as
even as possible in order to avoid the corresponding casting errors. An even compaction is a prerequisite
for a reproducible venting of the cavity during mold filling. Undercuts that appear during
the embedding of the foam tree into the sand bed and a resulting uneven compaction must possibly
be avoided. The mold material's compaction is achieved by uni- oder multiaxial vibration processes
with a corresponding variation of the chosen frequencies.
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ivybobo · 发表于 2009-11-4 08:52:23

Thank you so much. Do you have some information about the investment casting? Or some specialized vocabulary? I am a novice to this field. It is a lone way for me to learn. Thank you for your help.

lionwww · 发表于 2009-11-4 14:16:18

本帖最后由 lionwww 于 2009-11-4 14:26 编辑

sorry, I made a mistake. investment casting is not lost foam casting.

I am also a layman in investment casting process. This is all available materials for me.
the follow website has some information you may need. http://www.kovatchcastings.com/technicalinfo.htm

zjx1969 · 发表于 2009-11-13 23:37:06

铸造专业资料有铸造英汉词典、铸造（第二版）英文版

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