《模具专业英语l》PPT课件.ppt

1、Specified English for die or mold design and manufacturing,模具设计与制造专业英语,Introduction of the course课程介绍,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)认为专门用途英语词汇是专门用途英语中一个尤为重要的问题,对于二语或外语学习者来说,从普通英语学习过渡到专业英语学习,最大的难题就是专业词汇。,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. 用于专用刀具的专用材料通常是由刀具

3、正 确操作所需的力学性能决定的。,These materials should be selected only after a careful study and evaluation of the function and requirements of the proposed tool. 工具材料的选择必须事先对这种工具的使 用功能和要求进行认真的研究和估算。,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. 大多数场合下，不止一种材料满足条件， 材料的最终选择将要由材料的适用性和经济 条件来决定。,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个 主要类别：黑色金属、有色金属和非金属材 料。,Fe

5、rrous tool materials have iron as a base metal and include tool steel, alloy steel, carbon steel, and cast iron. 黑色金属是以铁作为金属基体，包括工 具钢、合金钢、碳钢和铸铁。,Nonferrous materials have a base metal other than iron and include aluminum, magnesium, zinc, lead,bismuth,copper,and a variety of alloys. 有色金属是指以除铁以外的其他元素

6、作为金属基体，包括铝、镁、锌、铅、铋、铜和大量的合金。,Ferrous tool materials have iron as a base metal and include tool steel, alloy steel, carbon steel, and cast iron. 黑色金属是以铁作为金属基体，包括工具钢、合金钢、碳钢和铸铁。,Nonferrous materials have a base metal other than iron and include aluminum, magnesium, zinc, lead, bismuth, copper, and a var

7、iety of alloys. 有色金属是指以除铁以外的其他元素作 为金属基体，包括铝、镁、锌、铅、铋、铜 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. 非金属材料是那些不含金属基体的材料，例如木材、塑料、橡胶、环氧树脂、陶瓷和金刚石。,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