机电专业英语第2版电子教案unit 10

机电专业英语第2版电子教案unit 10
机电专业英语第2版电子教案unit 10

Unit 10 NC Program

I. Lead in

Information related to the text

Have you ever seen an automatic factory?

In an automatic factory, there are no people working at all. All the parts are made by automatic machines. All materials are moved by automatic material-handing equipment. All assembly work is also done on an automatic assembly line. Even the quality control is also checked automatically.

II. Word Study

1. specify ['spes?fa?] vt. 指定;列举;详细说明;把……列入说明书

1) Please specify what you really want to say.

请具体说明你的真实想法。

2) Please specify a Location to Attach.

请指定要附加的地址。

2. preparatory [pr?'p?r?t r?] adj. 预备的

该词由prepare加后缀变得

1) I am attending college preparatory school.

我在读大学预科。

2) Her son is studying in a preparatory school.

她儿子正在一所大学预备学校学习。

3) There is much preparatory work for us to do.

我们有许多准备工作要做。

4) You should pack it up preparatory to sending it by post.

在邮寄之前你应该把它包好。

5) He bought a house in the country, preparatory to retirement.

他在乡下买了一栋房子以备退休后居住。

3. identify [a?'dent?fa?]vt. 识别;确定;使参与;把……看成一样

1) The bank will not change the cheque unless you can identify yourself.

只有你能证明你的身份,银行才为你兑换支票。

2) Surely you can't identify money with happiness!

你肯定不能把金钱和幸福等同喽!

3) The sensors can identify stress and early cracks that need attention.

传感器可以识别压力和需要注意的早期裂缝。

4) Assist Sales manager to finish target market segment analysis to identify potential business opportunity.

协助销售经理完成目标市场分析,寻找并确认潜在业务机会。

4. miscellaneous [?m?s??le?ni?s]adj.各种各样的;多方面的,多才多艺的

1) Everything can be filed under miscellaneous.

任何混杂的东西都可以归类。

2) In addition, our rubber machinery products of various types of miscellaneous pieces have a long history, and the market has been harsh assessment.

另外,我厂生产的各类机械橡胶杂件产品已有悠久的历史,已经过市场的严酷考核。

5. original [?'rid??nl] adj. 原始的;最初的;新颖的;独创的

1) The original picture is in the British Museum. 这幅画的原作在大英博物

馆内。

2)The original owner of the house moved out. 房子原先的主人搬出去了。

3)If you compare the translation with the original, you will find the

inaccuracy.

如果你把译文和原文比较一下,你就会找到不准确的地方。

4) We need a man of original ideas.

我们需要一个有独创性的人。

5)With the progress of science and knowledge, words add to their original meaning ( meanings) a new significance.

随着科学和知识的进步,词语在原来的意义上添加了新的含义。

6. encounter [?n'ka?nt?] n. 遭遇,偶然碰见v. 遭遇,邂逅;遇到

1)Before you succeed, you may encounter with many failures.

在你成功之前,你会遇到很多的失败。

2) Whatever difficulties you encounter you can always talk to us and we will try to help.

无论你遇到什么困难,你可以和我们讲,我们将会尽力帮助你。

3) Don't be afraid to encounter risks. It is by taking chances that we learn how to be brave.

不要害怕冒险。尝试冒险教会我们如何变得勇敢。

4) Putting shock absorbers under each rack of computers so that they could survive the rough landings they would inevitably encounter during transport.

在每座电脑机架下方安装吸震器,让电脑在颠簸的运输过程中不致损坏。

III.Language points

1.The number for discriminating each block is called the sequence

number,and the number for discriminating each program is called the program number.

译文:区分各个组块的号称为顺序号,区分每个程序的号称为程序号。

2.A block starts with a sequence number to identify the block and ends with an end-of-block code.

译文:一个程序块以一个顺序号开始并以一个程序块结束码结束。说明:句中start with以……开始;end with以……结束。

Let's start with what you know directly.

让我们直接从你所知道的开始。

This line should begin with a capital letter and end with a period.

这一行应该以大写字母开头,以句号结尾。

Will the Copenhagen climate conference end with a deal on carbon emissions? 哥本哈根气候会议将会为碳排放收场?

3.When machining of the same pattern appears at many portions of a program,a program for the pattern is created.This is called the subprogram.译文:在一个程序的许多部分出现相同图形的加工时,专为该图形编写出一个程序称为子程序。

4.However,when a command calling a subprogram is encountered in the main program,control is passed to the subprogram.

译文:不过,在主程序内遇到一个调用子程序的命令时,控制传到该子程序上。

说明:句中is passed to传给,转到。

The trust such firms place in us is passed to clients.

这些公司对我们的信任将直接嘉惠我们的客户。

The spirit is passed down from generation to generation.这种精神一代一代地传了下来。

5.When a command specifying a return to the main program is encountered in a subprogram,control is returned to the main program.译文:在一个子程序内遇到一个返回主程序的命令时,控制返回主程序。

说明:句中return to回到,恢复。

Things will return to normal before too long.用不了太久,情况就会恢复正常。Doctors say she can return to school in about a week.

医生说她大约一星期之后就能回到学校。

IV. Translating Skills

非谓语动词V-ing的用法

非谓语动词是动词的一种非限定形式,不可单独作谓语,其形式不受主语的人称和数的限制。非谓语动词有三种形式:V-ing , V-ed, to-V。由于非谓语动词由动词变化而来,因此它也保留了动词的特性,可带有自己的宾语和状语。

V-ing 形式通常被划分为动名词和现代分词。在使用时也可不加区分,但要准确把握其用法,弄清V-ing 形式在句中的作用及意义。

V-ing (或V-ing短语)可在句子中用作主语、表语、宾语、定语和状语等。

1. 作主语

Knowing how to use computer is useful. 知道怎样使用电脑是很有用的。

Controlling a machine tool using a punched tape or stored program is known as numerical control (NC). 数字控制就是利用穿孔纸带或储存的程序来控制机床。

2.作表语

His great fun is chatting with strangers online.

他最大的乐趣就是在网上和陌生人聊天。

3.作宾语

They are considering changing their operation plan.

他们正在考虑改变操作计划。

The second step in minimizing costs of production is choosing the cheapest of the technical efficient alternatives.

降低生产成本的第二个措施是选用最便宜的技术上有效地替代品。

4.作定语

单个的V-ing 作定语时,常放在被修饰名词的前面(也可放其后);但V-ing短语作定语时一般放在被修饰名词的后面。

All moving bodies have energy. 所有运动着的物体都有能量。

A direct current is a current flowing always in the same direction.

直流电流是指电流总向同一个方向流动的电流。

5.状语

V-ing短语作状语时,常表示逐句谓语动词的动作发生的时间、原因、条件、结果、方式、让步、伴随情况等。它们可置于句首、句中或句尾。

Having never handled a machine, he met with a lot of difficulties at first.

由于他从来没开过机器,一开始碰到很多困难。(原因状语)

When measuring current, the circuit must be opened and the meter inserted in series with the circuit or component to be measured. 当测量电流时,必须断开电路,以将万用表与待测电路或元器件相串联。(时间状语)

6.做主语或宾语的补足语

We put a hand above an electric fire and feel the hot air rising.

我们把手放在电炉的上方,就会感觉到热空气在上升。

He found the machine stopping working. 他发现机床停止了转动。

7. V-ing 的独立主格结构

多数情况下V-ing形式的逻辑主语和主句的主语相一致,但有时不一致,这时V-ing形式的逻辑主语和V-ing构成其独立结构。

With Mr. Green taking the lead, they decided to set up a trading company.

以格林先生为首,他们决定成立一个贸易公司。

V. Key to Exercises of the text.

II. 1. ( F ) 2. ( F ) 3. ( T ) 4. ( T ) 5. ( F )

III. 1. 在程序中,命令根据实际的刀具运动顺序来选定

2. 一个程序块以一个顺序号开始并以一个程序块结束码结束。

3. 程序有两种类型:主程序与子程序。

4. 通常情况下,CNC根据主程序来操作。

Key to Exercises of the reading

1. concentrate on

2. keep in mind

3. adapt to

4. with regard to

5. strict rules

6. instead of

7. reference point

8. circular motion

9. programming manual 10. automatic corner rounding

VI. 阅读材料参考译文

数控编程示例

在以下具体的例子中,我们将对工件的外形轮廓进行铣削。使用一把直径为一英寸的立铣刀加工轮廓,并以立铣刀的中心为编程轨迹。然后,在关键的第四步,我们会讨论工件轮廓的一种实际的编程方式(而不是刀具中心线轨迹)。尽管你可能不明白这个程序所提供的所有命令,但要集中精力搞清楚运动指令中发生了什么(G00,G01和G02/G03 )。在学习中,你应该能够搞清楚发生了什么。括号内所提供的信息是程序中每个命令的解释。

程序

O0002(程序号)

N005 G54 G90 S350 M03(选择坐标系,绝对坐标编程,主轴转速顺时针350转每分钟)

N010 G00 X-.625 Y-.25(快速移动到点1)

N015 G43 H01 Z-.25(进行刀具长度补偿,快速移动到工件表面)

N020 G01 X5.25 F3.5(刀具直线移动到点2)

N025 G03 X6.25 Y.75 R1.0(刀具逆时针圆周移动到点3)

N030 G01 Y3.25(刀具直线移动到点4)

N035 G03 X5.25 Y4.25 R1.0(刀具逆时针圆周移动到点5)

N040 G01 X.75(刀具直线移动到点6)

N045 G03 X-.25 Y3.25 R1.0(刀具逆时针圆周移动到点7)

N050 G01 Y.75(刀具直线移动到点8)

N055 G03 X.75 Y-.25 R1.0(刀具逆时针圆周移动到点9)

N060 G00 Z.1(Z方向上快速离开工件)

N065 G91 G28 Z0(移动到Z方向上机器参考点)

N070 M30(程序结束)

要注意的是不同的数控系统都有切削进给类型的局限。例如,有些数控系统在一个圆弧进给命令中对允许切削多大的圆有着严格的规定。有些数控系统在圆周命令中要求方向矢量而非R关键字。有些数控系统甚至加上了自动圆角、倒角,最大限度地减少了运动命令的数量。尽管你必须为各种变化做好准备,也必须参考数控系统制造商提供的编程手册中的编程命令,但至少本节内容给你提供了最基本的切削运动编程命令,使你更容易地适应特定的机器和控制系统。

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