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 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 Structure The 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 Structure 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. 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 Structure The 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 Structure Milling 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 para 10) The five basic techniques of machining metal. How many main parts are there in this passage? drilling & boring turning planing milling grinding

Writing points 论点： Paragraph one ： brief introduction 论据： Paragraph two and three: grounds of argument 结论： Paragraph four: conclusion

Writing points General 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

exercises Write 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.

Assignment Answer 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.

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