《模具專業(yè)英語l》PPT課件.ppt

1、Specified English for die or mold design and manufacturing,模具設(shè)計(jì)與制造專業(yè)英語,Introduction of the course課程介紹,For learners of English as a Second or Foreign Language (ESL/EFL), the major difficulty for them when they shift from English for General Purposes (EGP) field to ESP field is the specialized vocabul

2、ary (ESP vocabulary). Wallace(1982)認(rèn)為專門用途英語詞匯是專門用途英語中一個尤為重要的問題,對于二語或外語學(xué)習(xí)者來說,從普通英語學(xué)習(xí)過渡到專業(yè)英語學(xué)習(xí),最大的難題就是專業(yè)詞匯。,Unit One Tool Materials,The specific material selected for a particular tool is normally determined by the mechanical properties necessary for the proper operation of the tool. 用于專用刀具的專用材料通常是由刀具

3、正 確操作所需的力學(xué)性能決定的。,These materials should be selected only after a careful study and evaluation of the function and requirements of the proposed tool. 工具材料的選擇必須事先對這種工具的使 用功能和要求進(jìn)行認(rèn)真的研究和估算。,In most applications, more than one type of material will be satisfactory, and a final choice will normally be gov

4、erned by material availability and economic considerations. 大多數(shù)場合下，不止一種材料滿足條件， 材料的最終選擇將要由材料的適用性和經(jīng)濟(jì) 條件來決定。,The principal materials used for tools can be divided into three major categories: ferrous materials, nonferrous materials, and nonmetallic materials. 用于制作工具的主要材料可以分成三個 主要類別：黑色金屬、有色金屬和非金屬材 料。,Fe

5、rrous tool materials have iron as a base metal and include tool steel, alloy steel, carbon steel, and cast iron. 黑色金屬是以鐵作為金屬基體，包括工 具鋼、合金鋼、碳鋼和鑄鐵。,Nonferrous materials have a base metal other than iron and include aluminum, magnesium, zinc, lead,bismuth,copper,and a variety of alloys. 有色金屬是指以除鐵以外的其他元素

6、作為金屬基體，包括鋁、鎂、鋅、鉛、鉍、銅和大量的合金。,Ferrous tool materials have iron as a base metal and include tool steel, alloy steel, carbon steel, and cast iron. 黑色金屬是以鐵作為金屬基體，包括工具鋼、合金鋼、碳鋼和鑄鐵。,Nonferrous materials have a base metal other than iron and include aluminum, magnesium, zinc, lead, bismuth, copper, and a var

7、iety of alloys. 有色金屬是指以除鐵以外的其他元素作 為金屬基體，包括鋁、鎂、鋅、鉛、鉍、銅 和大量的合金。,Nonmetallic materials are those materials such as woods, plastics, rubbers, epoxy resins, ceramics, and diamonds that do not have a metallic base. 非金屬材料是那些不含金屬基體的材料，例如木材、塑料、橡膠、環(huán)氧樹脂、陶瓷和金剛石。,To properly select a tool material, there are several physical and mechanical properties you should understand to determine how the materials you select will affect the functio