热加工专业英语lesson2-9 (2)

Phrases and Expressions
used for 被用来 used in … 用于 made from… 由……制成（构成） similar to… 类似（相似）于……的 apply to… 致力于，适用于 apply … to… 把……应用（施加）于…… place …in (into) … 把……放入 placed in … 被放入……中 take the place of 代替 compared to… 好比是 as compared with… 与……相比 (as) compared with (to) 与……相比，同……比较起来 lost-foam casting 消失模铸造 evaporative-pattern casting 蒸发模样铸造
crucial a. 严厉的；极难的；决定性的 erosion n. 腐蚀；侵蚀；磨蚀 penetrate vt.穿透；透视； vi. 渗入；扩散 cluster n. 群集；v. 使群集，分组 vaporizes v. 使汽化；使蒸发 manipulate vt. 操作；处理；应付 assemble v. 集合；装配；安装；组合
takes advantage of the low boiling point of foam to simplify the investment casting process by removing the need to melt
the wax out of the mold.
聚苯乙烯泡沫塑料
and investment casting. Common permanent-mold process include
slush casting, pressure casting, die casting, and centrifugal casting. Expendable-mold casting usually involves lower mold
Techniques Reading Materials Summary References
New Words
foam n. 泡沫；泡沫材料；v. 使起泡沫 evaporative a. 蒸发产生的；（使）蒸发的 polystyrene n. 聚苯乙烯 glue vt. 胶合，粘结; n. 胶水，粘结剂 via prep. 经过；通过； n. 道路 dip vt. 浸；浸染；n. 浸渍；蘸湿；下沉 barrier n. 栅栏；屏障；障碍物 permeability n. 渗透性；透气性
First, a pattern is made from polystyrene foam, which can be done many different ways. For small volume runs the pattern can be hand cut or machined from a solid block of foam; if the geometry is simple enough it can even be cut using a hot-wire foam cutter. If the volume is large, then the pattern can be mass-produced by a process similar to injection molding. Preexpanded beads of polystyrene are injected into a preheated aluminum mold at low pressure. Steam is then applied to the polystyrene which causes it to expand more to fill the die. The final pattern is approximately 97.5% air and 2.5% polystyrene. Pre-made pouring basins, runners, and risers can be hot glued to the pattern to finish it.
Text 永久型铸造
一次性ses are generally classified as expendable-mold or permanent-mold casting. The most common expendable-mold
processes are sand, shell-mold, plaster-mold, ceramic-mold,
Part（Ⅳ） 科技英语疑难结构及其翻译 三、That 结构
教学思路设计
时间分配（共100min）： 1.讲解课文中的专业词汇和术语； 2.讲解课后生词、大声朗读； 3.翻译课文，注意穿插相关专业知识； 4.分析难点句型，讲解相关语法和翻译技巧； 5.学生答疑。
Contents
New Words Phrases and Expressions Text Analysis Questions Glossary of Terms Language Points & Translating
of parts.
汽化模型铸造
Lost-foam casting (LFC) is a type of evaporative-pattern
casting process that is similar to investment casting except
foam is used for the pattern instead of wax①. This process
Chapter Two
Unit 9 Lost-foam Casting
教学目标及要求
1.掌握课文中有关消失模铸造方面的专业词汇和专业术语； 2.结合消失模铸造相关专业知识阅读课文，提高翻译能力。
重点
1.消失模铸造的专业词汇和专业术语； 2.翻译课文：消失模铸造的工艺过程；
消失模铸造的特点。
难句分析及翻译的基本技巧
and equipment costs, but produces less dimensional accuracy. The molds used in permanent-mold casting are made of metal or
graphite, and are used repeatedly to produce a large number