lesson 11Standard Machining Operations

1、Professional English in Machinery机械专业英语机械专业英语2012-2013第二学期第二学期Lesson 11 Standard Machining Operations Questions1. How many kinds of machining operations do you know?2. How to speak them in English?3. Can you introduce them in English?Lesson 11 Standard Machining Operations Our tasks1. Translate the

2、paper2. Master the common processing in English3. Master the key words4. Analysis for some complex sentences.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine

3、 tools and machining technique that one day will be used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and

4、 machining technique that one day will be used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and machining

5、 technique that one day will be used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and machining technique

6、 that one day will be used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and machining technique that one

7、day will be used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and machining technique that one day will b

8、e used to fabricate the products that you design.Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should also have some hands-on experience with the machine tools and machining technique that one day will be used to

9、fabricate the products that you design.句子结构：从句句子结构：从句+倒装句倒装句正常语序正常语序：除了、，除了、，要要成为成为effective engineer, 第一个第一个that后面后面宾补宾补从句，从句，可以另外翻译可以另外翻译。第二个。第二个that定语从句，定语从句，Lesson 11 Standard Machining OperationsIn addition to being familiar with the mechanical components, to be an effective engineer one should

10、 also have some hands-on experience with the machine tools and machining technique that one day will be used to fabricate the products that you design.翻译：翻译：除了熟悉机器零件除了熟悉机器零件/部件以外，作为一个真正的工程师部件以外，作为一个真正的工程师还要具有一些机床和机加工技术的实践经验，也许有一还要具有一些机床和机加工技术的实践经验，也许有一天用于制造你设计的产品。天用于制造你设计的产品。In this section, we disc

11、uss cutting with drill dress, band saws, lathes, grinders and mills, which are some of the tool available to perform standard machining operation in prototyping and production shops. Each of these tools is based on the principle of removing unwanted material from a work piece through the cutting act

12、ion of sharpened bits or blades.Lesson 11 Standard Machining Operations Key words1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard Machining Operations Key words1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard Machining Operations Key word

13、s1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard Machining Operations Key words1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard Machining Operations Key words1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard

14、 Machining Operations Key words1. Prototyping 2. Production shops3. Work piece4. Bit5. bladeLesson 11 Standard Machining OperationsIn this section， we discuss cutting with:Drill pressesBand sawslathesGrindersmillsLead screw钻床钻床带锯带锯(锯床）锯床）车床车床磨床磨床铣床铣床滚珠丝杠滚珠丝杠Drill pressA drill press is used to bores

15、holes into a work piece. A drill bit is held in the rotating chuck, and as a machinist turns the pilot wheel, the bit is lowered into the surface of the work piece. The bit removes material in small chips and creates a hole in the work piece. As should be the case, whenever metal is machined, the po

16、int where the bit cuts into the work piece is lubricated. 机械工手轮，导轮使。降入到里面去应该如此润滑，起润滑作用The oil reduces friction, and it also helps to remove heat from the cutting region. For safety reasons, vises and clamps securely hold the work piece as the hold is bored in order to prevent material from shifting

17、unexpectedly.摩擦力地区，区域移动的，改变安全地牢固地夹子，夹具虎头钳Drill pressA drill press is used to bores holes into a work piece.Drill pressKey wordsChuckViseclampDrill pressKey wordsChuckViseclampDrill pressKey wordsChuckViseclampBand sawA band saw makes rough cuts through metal or plastic stock. The blade is a long, co

18、ntinuous loop having sharp teeth on one edge, and it rides on the drive and idle wheels. A variable-speed motor enables the operator to adjust the blades speed depend on the type and thickness of material that will be cut.连续循环边缘依靠，骑在，上面驱动器墯轮可变速电机Band sawA tilting table is used for support. The machi

19、nist feeds the work piece into the blade and guides it by hand, to make straight or slightly curved cuts. When the blade becomes dull and needs to be replaced, or if it should break, the band saws internal blade grinder and welder are used to clean up the blades ends, connect them, and form a loop.倾

20、斜台轻微的弯曲的磨刀砂轮焊工电焊机A band sawA band saw makes rough cuts through metal or plastic stock.A band sawA band saw makes rough cuts through metal or plastic stock.Key wordsBand sawIdle wheelsA band sawA band saw makes rough cuts through metal or plastic stock.Key wordsBand sawIdle wheelsA band sawA band saw

21、 makes rough cuts through metal or plastic stock.Key wordsBand sawIdle wheelsGrinding machineA grinding machine is a random point cutting tool which uses abrasives in the shape of a wheel, bonded to a belt, a stick or simply suspended in liquid. On a cylindrical grinding machine the grinding wheel r

22、otates between 5500 and 6500 r/min, while the workpiece rotates between 60 and 125r/min. The depth of cut is controlled by moving the wheel head. Grinding machineCoolants are provided to reduce heat distortion and to remove chips and abrasive dust. The grinding process is very important in productio

23、n work for several reasons:1. It is the most common method of cutting hardened tool steel or other heat-treated steel.变形，扭曲磨削屑Grinding machine2. It can provide surface finish of 0.5mm without high cost.3. The grinding operation can assure dimensions in a relatively short time.4. Tiny and thin parts

24、can only be finished by this method.微小Grinding machineKey wordsCylindrical grinding machineGrinding wheelHardened tool steelHeat-treatedGrinding machine A grinder machine is a random point cutting tool which uses abrasives in the shape of a wheel, boned to a belt, a stick or simply suspended in liqu

25、id.Key wordsCylindrical grinding machineGrinding wheelHardened tool steelHeat-treatedGrinding machine A grinder machine is a random point cutting tool which uses abrasives in the shape of a wheel, boned to a belt, a stick or simply suspended in liquid.Key wordsCylindrical grinding machineGrinding wh

26、eelHardened tool steelHeat-treatedGrinding machine A grinder machine is a random point cutting tool which uses abrasives in the shape of a wheel, boned to a belt, a stick or simply suspended in liquid.Key wordsCylindrical grinding machineGrinding wheelHardened tool steelHeat-treated主要用于磨削圆柱形和圆锥形外表面的

27、磨床Grinding machine A grinder machine is a random point cutting tool which uses abrasives in the shape of a wheel, boned to a belt, a stick or simply suspended in liquid.Key wordsCylindrical grinding machineGrinding wheelHardened tool steelHeat-treated用磨料和结合剂混合经压坯、干燥、焙烧而制成的，疏松的盘状、轮状等各种形状的磨具。Grinding

28、machineLathe A lathe holds the work piece and rotates it, and the sharpened edge of a tool cuts and removes material. Some applications of a lathe include the production of shafts, and thread cutting. The chuck on headstock hold one end of a workpiece, and the drive mechanism spins it rapidly about

29、its centerline.LatheThe tailstock can be used to provide support to the otherwise free end of a long work piece. As a cutting tool is fed against the bar stock and moved along its length, the diameter of the work piece is reduced to a desired dimension. Shoulder that will locate bearings on a shaft,

30、 grooves for holding retaining clips, and sharp changes in diameter of a stepped shaft cam each be made in this manner.Lathe A lathe holds the work piece and rotates it, and the sharpened edge of a tool and removes material.Key wordsShaft ThreadHeadstockTailstockBar shockShoulderGrooveRetaining clip

31、Stepped shaftLathe A lathe holds the work piece and rotates it, and the sharpened edge of a tool and removes material.Key wordsShaft ThreadHeadstockTailstockBar shockShoulderGrooveRetaining clipStepped shaftLathe PlanningPlanning is a relatively simple cutting operation which flats surface, as well

32、as various cross sections with grooves and notches are produced along the length of the workpiece. Planning is usually done on large work piece- as large as 25m X 15m.PlanningIn a planer, the work piece is mounted on a table that travels along a straight path. A horizontal cross rail, which can be m

33、oved vertically, is equipped with one or more tool heads. The cutting tools are attached to the heads, and machining is done along a straight path. Because of the reciprocating motion of the workpiece, elapsed non-cutting time during the return stroke is significant.planningPlanning is a relatively

34、simple cutting operation which flats surface, as well as various cross sections with grooves and notches are produced along the length of the work piece.Key wordsPlanningPlanerCross railTool headCutting toolPlanning Mill A mill is versatile machine tool which is useful for machining the rough surfac

35、e of a work piece flat and smooth and for shaping them with slots, and holes.Mill A mill is versatile machine tool which is useful for machining the rough surface of a work piece flat and smooth and for shaping them with slots, and holes.Mill A mill is versatile machine tool which is useful for mach

36、ining the rough surface of a work piece flat and smooth and for shaping them with slots, and holes.Mill The workpiece is held by a vise on an adjustable table so that the part can be accurately moved in three direction( in plane of the table and perpendicular to it) to locate the work piece beneath

37、the cutting bit. In a typical application, a piece of metal plate would be cut to approximate shape with a band saw, and the mill would be used to machine the surfaces and edges smooth, square, and to the final dimensions.Mill Lead screwA machine component known as a lead screw is often used in the

38、mills internal mechanisms for positioning the work table beneath the spindle.Lead screwA machine component known as a lead screw is often used in the mills internal mechanisms for positioning the work table beneath the spindle.Lead screw A machine component known as a lead screw is often used in the

39、 mills internal mechanisms for positioning the work table beneath the spindle.Lead screw A machine component known as a lead screw is often used in the mills internal mechanisms for positioning the work table beneath the spindle.Lead screw A machine component known as a lead screw is often used in t

40、he mills internal mechanisms for positioning the work table beneath the spindle.结构：结构：机器零件（主语）、被应用在机器零件（主语）、被应用在mill 的、，实现、的的、，实现、的作用。作用。被动被动语态翻译时翻译为常态。在翻译中尽量不要出现被、的语态翻译时翻译为常态。在翻译中尽量不要出现被、的句子句子Lead screwA machine component known as a lead screw is often used in the mills internal mechanisms for positioning the work table beneath the spindle.翻译：翻译：通常在铣床的内部机构中常用一个