《机械工程英语》课件Chapter 4.ppt

1、Chapter 4 Inspection Technology Chapter 4 Inspection Technology Warming-upListeningSpeakingReadingWriting&TranslationChapter 4 Inspection Technology ObjectivesAfter studying this chapter,you are able to:master some expressions about inspection.discuss inspection technologies with others.understand a

2、nd keep inspection records.translate relevant reading materials.Chapter 4 Inspection Technology Warming-upChapter 4 Inspection Technology Task 1 As a quality inspection engineer,you may experience the following situations in your daily work.Match each situation with its corresponding picture.()Discu

3、ssing the new lathe design specifications with colleagues.()Testing the lathe sample.()Communicating with customers.()Reporting the inspection results to the Production Manager.Chapter 4 Inspection Technology Task 2 The following are what an engineer usually does for quality inspection.Arrange them

4、in the order of time and explain.a.Take corrective actions when errors or defects are detested.b.Carry out various inspections at different stages of the manufacturing process.c.Study the product design specifications.d.Write the inspection records.e.Set up inspection steps.Chapter 4 Inspection Tech

5、nology ListeningChapter 4 Inspection Technology Task 1 Su Yang is discussing an inspection scheme with Zhao Lin,the Quality Inspection Manager.Listen to the conversation and choose the best answer to each question.1.Which inspection will be conducted first?()A.First Piece Inspection.B.Receiving Insp

6、ection.C.Batch Inspection.D.Sampling Inspection.2.According to Zhao Lin,which inspection is of great importance?()A.First Piece Inspection.B.Receiving Inspection.C.Final Inspection.D.Sampling Inspection.Chapter 4 Inspection Technology 3.How often will they carry out the sampling inspections?()A.Twic

7、e a week.B.At set intervals.C.At random.D.Every day.4.When is the Final Inspection usually carried out?()A.Before the lathes are ready for packaging.B.After the lathes are transported to the customers.C.Before the lathes are installed for a testing.D.When the material and the parts from the supplier

8、s arrive.5.What does Zhao Lin remind Su Yang to do at last?()A.To send her the inspection scheme.B.To check missing parts of the lathes.C.To study the designing specifications.D.To keep records of the inspections.Chapter 4 Inspection Technology Task 2 Zhao Lin is talking about WP-16 Lathe with Gu Ji

9、e at the meeting.Listen to the conversation and fill in the blanks with what you hear.Zhao Lin:Gu Jie,could you tell me the most striking 1 of WP-16 Lathe?To carry out inspection,we need to have a broad knowledge of the product to be manufactured and its 2 use.Gu Jie:Well,different from other produc

10、ts,the WP-16 Lathe is designed to enable the user to take a 3 position when they operate it.Zhao Lin:So it 4 for Sit Down.Gu Jie:Right.And it will be built with the same strong 5 as our full-size lathes.Zhao Lin:Yes.Gu Jie:A high-quality,precision 6 ,precision machined bedways,as well as our patente

11、d locking mechanism are all 7 features of this machine.Zhao Lin:Spindle,bed ways and locking mechanismChapter 4 Inspection Technology Gu Jie:Here is the detailed designing 8 .Zhao Lin:I will take it back to the Inspection Department to study it together with my 9 before we can set up a sequence of 1

12、0 .Gu Jie:Contact me anytime you have a problem.Chapter 4 Inspection Technology SpeakingChapter 4 Inspection Technology Dialogue 1Su Yang:Good morning,Miss Zhao,Im working on the inspection scheme of the newly-designed lathe.Zhao Lin:Good.How is it going?Su Yang:Actually,we have already worked out a

13、n inspection scheme based on the studying of its designing specifications.Zhao Lin:Thats good.Could you tell me what inspections you are going to make?Su Yang:Certainly.They are the Receiving Inspection,the First Piece Inspection,Sampling Inspections and the Final Inspection.Zhao Lin:Dont forget to

14、specify the sample size.And remember to keep records of the inspections.Su Yang:All right.Thanks a lot.Zhao Lin:You are welcome.Chapter 4 Inspection Technology Dialogue 2Zhao Lin:Su Yang,did you have a nice weekend?Su Yang:Well,not very,actually.I spent a whole day reading an inspection scheme.But i

15、t seems that something is beyond my understanding.Zhao Lin:Really?Can I be of help?Su Yang:Just what I need.What is“first piece”in the First Piece Inspection?Zhao Lin:It refers to the very first product or part we produce.Su Yang:Is the First Piece Inspection very important in the whole inspection p

16、rocess?Zhao Lin:Of course.It can find errors possibly caused by design or manufacturing so that the loss of mass production could be avoided.Su Yang:I see.Thank you so much for your help.Zhao Lin:My pleasure.Chapter 4 Inspection Technology Dialogue 3Gu Jie:Hello?Get me Su Yang on the phone,please.Su

17、 Yang:This is Su Yang.Is that Mr.Gu?Gu Jie:Yes.This is Gu Jie.Su Yang,have you been informed of the meeting to be held this afternoon?Su Yang:Yes.It is about the problem I have found during the First Piece Inspection.Gu Jie:Im calling to ask you about it.What problem have you found?Su Yang:Its the t

18、ailstock of the newly designed lathe.It is not tight.Gu Jie:Have you recorded down all the measurements and observations about it on the First Piece Inspection Report?Su Yang:Yes,I have.Gu Jie:All right.Bring the report with you this afternoon.We are going to discuss the corrective measures.Chapter

19、4 Inspection Technology Su Yang:OK.Could I use the Cause-and-effect Diagram?I think it may help analyze the problems.Gu Jie:Certainly.Nothing is better than that.See you then.Su Yang:See you.Chapter 4 Inspection Technology New Words and ExpressionsFirst Piece Inspection 首件检验mass production 大规模生产Caus

20、e-and-effect Diagram 因果图Task 1 Listen to the recording and read the dialogues aloud.Task 2 Study and a role-play the dialogues with your partner.Chapter 4 Inspection Technology ReadingChapter 4 Inspection Technology Text AThe Features of TransducersA transducer is a device which converts the quantit

21、y being measured into an optical mechanical,or more commonlyelectrical signal.Transducers are classified according to the transduction principle involved and the of the measured,such as capacitance,inductance transducers,piezo-electric transducers,magnetoelectric transducers,thermoelectric transduce

22、rs and photoelectric transducers,etc.1.Capacitance,Inductance TransducersMeasuring techniques used with capacitive and inductive transducers:(1)AC excited bridges using differential capacitors inductors;(2)AC potentiometer for dynamic measurements;(3)DC circuits to give a voltage proportional to vel

23、ocity for a capacitor;(4)frequency-modulation methods,where the change of C or L varies the frequency of an oscillation circuit.Chapter 4 Inspection Technology The important feature of capacitive and inductive transducers is infinite resolution and accuracy0.1%of full scale is quoted.Typical measure

24、d are displacement,pressure,vibration,sound,and liquid level.2.Piezo-electric TransducersWhen a force is applied across the faces of certain crystal materials,such as natural quartz crystals or barium titanate ceramics,electrical charges of opposite polarity appear on the faces due to the piezo-elec

25、tric effect.Since these materials generate an output charge proportional to the applied force,they are most suitable for measuring force-derived variables such as pressure,load,and acceleration as well as force itself.The transducers steady-state response is poor.This can be overcome by using measur

26、ing amplifiers with very high input impedances(1012 to 1014 ohm being typical)known as charge amplifiers,but these make the measuring system increasing expensive.Chapter 4 Inspection Technology 3.Magnetoelectric TransducersThese employ the well-known generator principle of a coil moving in a magneti

27、c field and is usually used in velocity transducer.Some important features of the magnetoelectric transducer are as follows:(1)output voltage is proportional to the velocity of input motion;(2)usually they have a large mass,hence they tend to have low natural frequencies;(3)high power outputs are av

28、ailable.4.Thermoelectric TransducersWhen two dissimilar metals or alloys are joined together at each end to form a thermocouple and the ends are at different temperatures,an emf will be developed causing a current to flow around the circuit.The magnitude of the emf depends on the material used.This

29、thermoelectric effect is widely used in temperature measurement and control system.Chapter 4 Inspection Technology Although they do give a direct output voltage,this is generally smallin the order of millivolt and often requires amplification.Advantages of thermocouples include:(1)Temperature at loc

30、alized points can be determined,because of the small size of the thermocouple;(2)They are robust,with a wide operating range from 250-2000.5.Photoelectric TransducersThe photoelectric or photovoltaic cell makes use of the photovoltaic effect,which is the production of an emf by radiant emergenceusua

31、lly light incident on the junction of two dissimilar materials.Light traveling through the transparent layer generates a voltage which is a logarithmic function of light intensity.The device is highly sensitive and has a good frequency response;and,because of its logarithmic relationship of voltage

32、against light,is very suitable for sensing over a wide range of light intensities.Chapter 4 Inspection Technology New Words and Expressionstransducer trnzdjus n.传感器transduction trnsdkn n.转化measurand mernd n.被测变量，被测物理量capacitivekpstv adj.电容性的inductive ndktv adj.感应的，电感的potentiometer ptenmt(r)n.电位计dyna

33、mic danmk adj.动态的,动力的proportional prpnl adj.比例的，成比例的infinite nfnt adj.无限的，无穷的quote kwt vt.&vi.引述，引用displacement dsplesmnt n.位移impedance mpidns n.电阻抗thermoelectric mlektrk adj.热电的Chapter 4 Inspection Technology thermocouple mkpl n.热电偶photoelectric ftlektrk adj.物光电的transparent trnsprnt adj.透明的logarith

34、mic lrmk adj.对数的intensity ntenst n.强度piezo-electric transducer 压电式传感器magnetoelectric transducer 磁电式传感器thermoelectrictransducer 热电式传感器photoelectric transducer 光电式传感器photoelectric cell 光电管Chapter 4 Inspection Technology Notes1.A transducer is a device which converts the quantity being measured into an

35、 optical,mechanical,or more commonly-electrical signal.传感器是一种将被测量转化成光的、机械的或者更平常的电信号的装置2.Important features of capacitive and inductive transducers are infinite resolution and accuracy 0.1%of full scale is quoted.电容式和电感式传感器的重要特征是：无限的分辨率，可以精确到满量程的0.1%3.When a force is applied across the faces of certa

36、in crystal materials,such as natural quartz crystals or barium titanate ceramics,electrical charges of opposite polarity appear on the faces due to the piezo-electric effect.当对某晶体材料(如天然石英晶体或钛酸钡陶瓷)施加一个力时，负极的电荷就会在压电效应下出现Chapter 4 Inspection Technology Task1 Answer the following questions according to

37、the text.1.What is the definition of the transducer?2.Write down some kinds of transducers you are familiar with?3.What are typical measurands of capacitive or inductive transducers?4.What crystal materials have the piezo-electric effect?5.What are the advantages of thermocouples?Task 2 Translate th

38、e following phrases.1.位移 6.magnetic field2.热电偶 7.magnetoelectric transducers3.分辨率 8.potentiometer4.阻抗9.steady-state response5.光电效应10.piezo-electric effectChapter 4 Inspection Technology Task 3 Translate the following sentences into English.1.压电材料能够产生与施加力成比例的输出电荷2.磁电式传感器利用线圈在磁场中运动产生电流的原理制成3.输出电压与输入运动

39、速度成正比4.热电效应被广泛应用于温度测量与控制系统中5.光电管是利用光电效应的原理制成的Chapter 4 Inspection Technology Text BInspection Record of a Precision Bench LatheKeeping inspection records is a key element in conducting inspections.The primary purpose of a record is to communicate and document the findings of an inspection.It is inte

40、nded to include the important characteristics to be checked and all the essential inspection details.The chart below is an Inspection Record of a Precision Bench Lathe.Chapter 4 Inspection Technology Chapter 4 Inspection Technology New Words and Expressionsalignment lanmnt n.校直，调准chunk tk n.卡盘docume

41、nt dkjumnt v.用文件记录finding fand n.(pl.)结果headstock hedstk n.头架horizontal hrzntl adj.水平的inspector nspekt(r)n.检查员primary pramr adj.首要的，主要的remark rmk n.评论；备注runout rnat n.偏斜，偏心率tailstock telstk n.尾架，尾座vertical vtkl adj.垂直的designing specification 设计规格Chapter 4 Inspection Technology measured value 测量值prec

42、ision bench lathe 精密台式机床spindle center 主轴中心spindle nose 主轴端Chapter 4 Inspection Technology Task 4 Read the text and answer the following questions.1.What is the main purpose of keeping inspection records?2.What does an inspection record usually contain?3.When is the inspection of Precision Bench Lat

43、he STQ185 conducted?4.Who conducted this inspection?5.Whats the result of this inspection?Task 5 Match the English expressions with their Chinese meanings.1.Spindle Center RunoutA.主轴端偏摆2.Spindle Nose RunoutB.头架垂直校准3.Headstock Alignment VerticalC.划线平板偏摆4.Headstock Alignment HorizontalD.头尾中心垂直校准5.Tail

44、stock Spindle Alignment Horizontal E.主轴中心偏摆6.Vertical Alignment of Head and Tail CentersF.卡盘偏摆Chapter 4 Inspection Technology 7.Face Plate RunoutG.头架平行校准8.Chuck RunoutH.尾架主轴平行校准Task 6 Translate the following passage into Chinese.One of the most important methods to inspect the manufacturing process

45、is statistical quality control.In statistical quality control,quality of a product is inferred from a sample taken from the population of the items.The sample of items is generated randomly from the population.Each item in the sample is inspected or tested for certain attributes and quality characte

46、ristics.The objective of statistical quality control is to determine when the process has gone out of control,so that corrective action can be taken.Chapter 4 Inspection Technology Writing&TranslationChapter 4 Inspection Technology Task 1 Read the following job advertisement and translate it into Ch

47、inese.WantedQuality inspection engineerResponsibilityPeriodic communication with customer to monitor and improve customers satisfaction;Organize to make corrective and preventive action to customer complaints and follow up to solve;Help customer to do process and product audit to find improvement sp

48、ace to lower customer complaints to our products;Maintain documents and records:Accomplish other tasks assigned by superiors:Chapter 4 Inspection Technology Requirements:1.Bachelor degree or related field;2.Minimum 3-year quality control experience;3.Have customer complaints handling experience and

49、good communication ability with customer;4.Strong problem-solving skill;5.Familiar with corrective and preventive actions;6.Familiar with process control quality tools;7.Good communication ability in English.If you are interested in this job,and have the qualifications we require,please send both your English and Chinese resume to us.Task 2 Write an application letter if you are interested in the job.