机电工程专业英语 作者 朱晓玲 Lesson 9.ppt

Lesson 9The Principle of Numerical Control(NC)数控技术原理
Section I Words and Phrases
Section II Text and Translation
Section III Exercises and Answers
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Section I Words and Phrases
craftsman[5krB:ftsmEn] ;手艺精巧的人
variable [5vZEriEbl] ,可变物 ,不定的
perform [pE5fC:m] ,执行
supervision [7sju:pE5viVEn] ,管理
via [5vaiE, 5vi:E] ,经由
constitute [stitju:t] ,建立
identical [ai5dentikEl] ,同样的
flexibility [7fleksE5biliti] ,适应性
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Section I Words and Phrases
spindle [5spindl] ,锭子
drill [dril] ,钻子,军事训练,(反复)练****钻孔
lathe [leiT] ;
milling [5miliN] , 制粉, [机]轧齿边
grinder [5^raindE] , 尤指磨***的工人, <美俚>***舞女演员
vertical [5vE:tikEl] ;, 垂直面, 竖向
horizontal [tl] , 水平的
inspection [in5spekFEn] ,视察
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Section I Words and Phrases
assembly [E5sembli] ,装配,集会,集结,汇编
rotate[rEu5teit] v.(使)旋转
mechanism [5mekEnizEm] ,机构,机制
auxiliary [C:^5ziljEri],补助的
hydraulic [hai5drC:lik]
lubrication [7lu:bri5keiFEn]
column [5kRlEm]
magazine [7mA^E5zi:n] ;杂志
majority [mE5dVCriti]
intervention [7intE(:)5venFEn]
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Section I Words and Phrases
numerical control(NC) 数字控制
a punched tape穿孔纸带
turning center 切削中心
vertical-spindle machine center卧式加工中心
horizontal-spindle machine center 立式加工中心
electrical discharge machine 电火花加工机床
flame cutter线切割机床
serve drive system 伺服驱动系统
lead screw 丝杠,螺杆
automatic tool changer(ATC) 自动换刀装置
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Section II Text
Early machine tools were operated by craftsmen who decided many variables such as speeds, feeds, and depth of cut, etc1. With the development of science and technology, a new term, numerical control (NC) appeared. Controlling a machine tool using a punched tape or stored program is known as numerical control. When numerical control is performed puter supervision, it is p