江西制造职业技术学院江西制造职业技术学院

English for Mechanical Engineering

Reading ComprehensionReading Comprehension

机械专业英语阅读

Unit One: Manufacturing Engineering

Passage One

The Basic Operations

of

Machining Metal

Learning Objectives

To understand the whole passage.

To master the five basic techniques of machining metal.

★

★

★

To know the differences between each other.

Training Target

In the part, our target is to train your reading speed. We have made the complex sentences strong black and marked the subject, predicate and object of them. Try to grasp the main idea of these sentences.

Teaching Procedures

Step D: Assignment

Step C: Structural Analyzing

Step B: Passage Understanding

Step A: Lead in

Lead- in

What are the five basic techniques used for machining metal?

MM

Drilling& boring

Turning

planing

milling

grinding

Lead-in

New words and expressions

drilling 钻削 blind hole 盲孔

boring 镗削 single-point tools 单刃刀具

turning 车削 cutting tool 切削刀具

planing 刨削 hand plane 手刨

milling 铣削 circular saw 圆锯

abrasive wheel 砂轮

Fast reading

Passage understanding

Try to explain drilling, boring, turning, planing, milling, grinding in one sentence in English.

Drilling involves producing through or blind holes in a solid metal by a cutting tool, which rotates around its axis, against the workpiece.

Passage understanding

Boring, on the other hand, involves the finishing of a hole already drilled or cored by means of a rotating, offset, single-point tool.

Passage understanding

Turning is a type of metal processing operation where a cutting tool is used to remove an unwanted material to produce a desired product, and is generally performed on lathe.

Passage understanding

Planing metal with a machine tool is a process similar to planing wood with a hand plane.

Passage understanding

Milling consists of machining a piece of metal by bringing it into contact with a rotating cutting tool which has multiple cutting-edges.

Passage understanding

Grinding consists of shaping a piece of work by bringing it into contact with a rotating abrasive wheel.

Passage understanding

Sentences StructureThe function of flutes is to provide outlet passages for the chips generated during the drilling operation and also to allow lubricants and coolant to reach cutting edges and the surface being machined.主语 : the function of flutes

系动词： is

表语： ① to provide outlet passages for the chips

generated during the drilling operation

② to reach cutting edges and the surface

being machined.排屑槽的作用是作为钻削过程中所 产生切屑的通道及让润滑液，冷却液流向加工表面的通道。

Sentences StructureTurning is a type of metal processing operation where a cutting tool is used to remove an unwanted material to produce a desired product, and is generally performed on lathe.

主语： turning 谓语： is

宾语： a type of metal processing operation

关系副词： where

定语从句： a cutting tool is used to remove an …车削是金属加工的一种方法，试讲家属表面多余的金属去除，生产出所要求的产品，一般在车床上完成。

Sentences StructureThe essential different lies in the fact that the cutting tool remains in a fixed position while the workpiece is moved back and forth beneath it.

主语 : the essential different

谓语： lies in

宾语： the fact

关系词： that

同位语从句： the cutting tool remains in a …本质区别实际上在于当工件在道具下面来回地运动时，刨刀是固定在一个位置不动的。

Sentences StructureMilling consists of machining a piece of metal by bringing it into contact with a rotating cutting tool which has multiple cutting – edges.

主语 : milling

谓语 : consists of

宾语： machining a piece of metal

状语： by bringing it into contact with a rotating cutting tool

关系词： which

定语从句： has multiple cutting- edges

铣削是使工件与有多条切削刃的旋转刀具相接触。

Structural Analyzing

Part one: (para 1---para 4 ）

The importance of machining processes.Part two: (para 5 --- para 10)

The five basic techniques of machining metal.

How many main parts are there in this passage?

drilling & boringturningplaningmillinggrinding

Writing points

论点： Paragraph one ： brief introduction

论据： Paragraph two and three:

grounds of argument

结论： Paragraph four: conclusion

Writing pointsGeneral speaking ： paragraph five

What are the five basic techniques of

machining metal.

Details： paragraph 6 description of drilling and boring

paragraph 7 description of turning

paragraph 8 description of planing

paragraph 9 description of milling

paragraph 10 description of grinding

exercisesWrite true of false beside the following statements about the text.1. Boring is completed by means of a rotating drill.

2.Drilling is often used to carry out the finishing of a hole already cored.3. The process of planing metal with a machine tool is somewhat like that of planing wood with a carpenter’s hand plane.4. In shaping, the workpiece is held when the tool moves back and forth.5. Planer is a huge piece of quipment.

6. Turning is the most widely used method of machining processing.

AssignmentAnswer the following questions according to the text.

1. What are the five basic techniques used for machining metal?

2. What are the variations of the five basic techniques?

3. Please describe the difference between shaper and planer.

江西制造职业技术学院