数控技术应用专业英语第三版配套资源习题参考答案.pdf

1 学习学习情境一情境一 任务任务 1 1 习题参考答案习题参考答案 EXERCISE 1 Fill in the blank according to the text. 1. late 2. turning drilling 3. main feed 4. large diameter disc type 5. headstock guide way tailstock 6. the hydraulic cylinder the chuck 7. the turret fast-moving cutting fluid switch EXERCISE 2 Match A with B. EXERCISE 3 Choose the best answer. 1.c 2. a 3. c 4. b 5.a EXERCISE 4 Answer the following questions briefly according to the text. 1. The program is changed. 2. a longer axial dimension or a small disk type workpieces 3. construction casting molded with resin 4. the hydraulic system pressure 2 5. by graphics and text symbols which represent the connection between electrical components and electrical works in the circuits. 任务任务 2 2 习题参考答案习题参考答案 EXERCISE 1 Write the English name of each tool on the corresponding number. 1. center drill 2. external turning tool 3. twist drill 4. thread tool EXERCISE 2 Match A with B. EXERCISE 3 Fill in the blank according to the text. 1. dimensional 2. perpendicularity 3. quenching 4. taper 5. High-speed steel（HSS） 6. function adequately 7. Cemented carbides 8. negative EXERCISE 4 Answer the following questions briefly according to the text. 1. The symbol means symmetry. 3 2. Positive rake angle reduces the cutting forces resulting in smaller deflections of the workpiece, tool holder and machine. 3. Depth of cut is defined as the distance that the cutting tools is plunged into the workpiece. 4. It is generally recommended to use higher feed rate for roughing operations. 5. The cutting speed is dependant primarily upon the material being machined as well as the material of the cutting tool .There are also other variables that affect the optimal value of the cutting speed. These include the tool geometry, the type of lubricant and coolant, the feed and the depth of cut etc. 6. If the depth of cut is too large, the insert may be overloaded, causing immediate breakage. 7. Center drill and twist drill are required in drilling operation. EXERCISE 5 Make calculation using the formula in the text. 1. n=1000V/D= 1000 157/50 =1000 r/min 2. ap =(dw-dm)/2=(50-46)/2=2mm EXERCISE 6 Write down the symbols and Chinese meaning according to the description of the geometry tolerance. 种类 符号 中文含义 profile of line 线轮廓度 flatness 平面度 circularity(roundness) 圆度 parallelism 平行度 perpendicularity 垂直度 cylindricity 圆柱度 position 位置度 total run out 全跳动 4 任务任务 3 3 习题参考答案习题参考答案 EXERCISE 1 Match A with B. EXERCISE 2 Answer the following questions briefly according to the text. 1. It usually starts with “o” or “%”. 2. The programmer. 3. M02 or M30. 4. If the programmer makes a mistake in incremental program, every incremental movement from that point will be incorrect. 5. The manufacturer. 6. The preparatory codes or words are called G codes. 7. Coordinates from the program zero point is called absolute mode of programming. EXERCISE 3 Mark the following statements with T（true） or F（false）. 1.T 2.F 3.T 4.F 5.F 6.F 7.T 8.F EXERCISE 4 Fill in the blanks according to the text. 1. miscellaneous 2. X and Z axes 3. distance 4. a new value is specified 5 5. rough out 6. machine; workpiece; local 7. program zero 任务任务 4 4 习题参考答案习题参考答案 EXERCISE 1 Match A with B. EXERCISE 2 Answer the following questions briefly according to the text. 1. The cursor keys . 2. The feed rate knob. 3. Rotate the feed rate knob clockwise. 4. The EOB key . 5. MDI is used to perform manual functions that cannot be done in the manual mode. 6. We used the address/number key to input the program number. 7. You input the new value, and press the input key. EXERCISE 3 Mark the following statements with T（true） or F（false）. 1. F 2. T 3. F 4. F 5. T 6. F 7. F 8. T EXERCISE 4 Fill in the blanks according to the text. 6 1. jog 2. increases 3. program key 4. page key 5. input key 6. offset key 任务任务 5 5 习题参考答案习题参考答案 EXERCISE 1 Match A with B. A B EXERCISE 2 Answer the following questions briefly according to the text. 1. It usually consists of sleeve, thimble, anvil, spindle and ratchet etc. 2. First, read the whole number on the main scale. The main scale is read by taking note of where the zero mark on the vernier scale falls on the main scale. Second, read the decimal on the vernier scale. This number is taken as the line on the vernier scale that aligns with any line on the main scale. Finally, add the whole number and decimal together as the final measuring result. 3. First, take the thimbles end surface as the directrix, you read the markings on the sleeve. Second, take the center line on the sleeve as the directrix, read the markings on the thimble. Finally, add all the numbers together to determine the dimension of your workpiece. 4. It can trace the surfaces of various machine parts, calculates surface roughness based on standards 7 roughness specimen and displays the results. 5. A coordinate measuring machine is comprised of four main components. They are the main itself, the measuring probe, the controlling system for computer and the measuring software. EXERCISE 3 Read the following vernier calipers（the precision is 0.02 mm）. 20.46mm 16.38mm EXERCISE 4 Read the following outside micrometers（the precision is 0.01 mm）. 3.079mm 9.130mm 学习学习情境二情境二 任务任务 1 1 习题参考答案习题参考答案 EXERCISE 1 Match A with B. EXERCISE 2 Answer the following questions briefly according to the text. 1. Machining center has been defined as multifunction CNC machine with automatic tool-changing capabilities and tool magazine. 2. The main components of CNC machining center are bed, saddle, column, table, servo system, spindle, tool changer and the machine control unit. 3. The servo system consists of servo drive motor, ball screw and position feedback encoder etc. 8 4. Machine control unit (MCU) is a computer used to store and process the CNC programs entered. 5. They are vertical, horizontal and universal machining center. 6. Vertical machining center widely accepted and used, primarily for flat parts. 7. If lubricating oil is insufficient, liquid level switch SL3 is closed, I1.6 is closed in the network 7, also makes M0.7 to 1, disconnect the motor M and alarm. 8. regulate the flow of compressed air. EXERCISE 3 Mark the following statements with T（true） or F（false）. 1.T 2. F 3.T 4.T 5.T 6.T 7. F EXERCISE 4 Choose the best answer. 1. a 2. c 3. b 4. c 5. b 任务任务 2 2 习题参考答案习题参考答案 EXERCISE 1 Match A with B. EXERCISE 2 Write the English name of each tool on the corresponding munber. 1. dial test indicator 2. Z-zero-setter 3. face milling cutter 4. reamer EXERCISE 3 Fill in the blank according to the text. 1. Dial test indicator 2. edge-finder Z -zero -setter 3. vernier caliper 9 EXERCISE 4 Choose the best answer. 1.c 2. b 3.a 任务任务 3 3 习题参考答案习题参考答案 EXERCISE 1 Match A with B. A B EXERCISE 2 Answer the following questions briefly according to the text. 1. G94 specify the amount of feed of the tool per minute, G95 specify the amount of feed of the tool per spindle revolution. 2. If a program contains a fixed sequence or frequently repeated pattern, such a sequence or pattern can be stored as a subprogram in memory to simplify the program. 3. By setting the difference between the length of the standard tool and the length of each tool in the CNC, machining can be performed without altering the program even when the tool is changed. 4. The direction of the moving cutter during the machining and the placement of the surface being machined. 5. By making the design in a CAD software, e.g. UG, Pro/Engineer SolidWorks and saving it in a format that MasterCAM X can import. 6. Click Toolpaths Tool Manager in the tool manager dialog box, all available tools are displayed. You can search for a particular type by scrolling down the list or by using the filter button 10 and entering the search information. 7. The purposes of verifying the cutting process are： （1）To detect geometric error of the cutter path （2）To detect potential tool interference （3）To detect erroneous cutting conditions EXERCISE 3 Mark the following statements with T（true）or F（false）. 1.F 2. F. 3. F 4.T 5. F EXERCISE 4 Fill in the blanks according to the text. 1. fixed sequence 2. tool length compensation 3. initial level 4. “Filter” 5. post-processing 任务任务 4 4 习题参考答案习题参考答案 EXERCISE 1 Match A with B. A B EXERCISE 2 Fill in the blank according to the text. 1. manufacturer 2. dry run 11 3. automatic operation 4. single block 5. clockwise. 6. open or close the cutting fluids 7. reference point EXERCISE 3 Answer the following questions briefly according to the text. 1. The key is used to adjust the feed rate. 2. Switch on the main breaker at the rear of the machine then Press the key which is located in the lower right corner of the operation panel. 3. Programs can be created using any of the following methods: (1) MDI keyboard (2) Application of transmission software 4. The dry run and single block function are commonly used for checking the program. 5.The key is used to remove chips clockwise. EXERCISE 4 Translate the English into Chinese（Fig.2 -4 -8）. 自动模式键 编辑模式键 MDI（手动数据输入）模式键 DNC 模式键 返回零点模式键 增量进给模式键 点动模式键 手轮模式键 12 学习学习情境三情境三 任务任务 1 1 习题参考答案习题参考答案 EXERCISE 1 Match A with B. EXERCISE 2 Answer the following questions briefly according to the text. 1. (1) It can machine complex shapes; (2) It can cut hard material with high accuracy; (3) It can make very small workpieces; (4) It can make delicate sections and weak material; 2. There are five commonly used electrodes: bras, scopper, tungsten, zinc and graphite. 3. Sinker EDM has found widespread use not only in the manufacture of mold making, but also in aerospace applications and the production of small holes and micro holes. EXERCISE 3 Mark the following statements with T（true） or F（false）. 1. T 2. T 3. F 4. T 5. T EXERCISE 4 Fill in the blanks according to the text. 1. machining 2. hard 3. traditional 4. conductive 5. treatment 任务任务 2 2 习题参考答案习题参考答案 EXERCISE 1 Match A with B. 13 EXERCISE 2 Answer the following questions briefly according to the text. 1. (1) Material of any hardness can be cut (2) high accuracy and good surface finish are possible (3) no cutting forces involved. 2. The differences between high speed WEDM and low speed WEDM are as following: Type Item High speed wire EDM Low speed Wire EDM Wire electrode speed High Low Wire electrode movement Back and forth One-way movement Surface rough and accuracy Better good Price Lower price Higher price 3. The main components of CNC WEDM are CNC system, pulse power, wire drive mechanism, dielectric fluid regeneration system. EXERCISE 3 Mark the following statements with T（true）or F（false）. 1. F 2. T 3. F 4 T EXERCISE 4 Fill in the blanks according to the text. 1. conductive 2. discharges 3. Wire 4. dielectric 5. workpiece 6. gap 任务任务 3 3 习题参考答案习题参考答案 EXERCISE 1 14 Write the English name on the corresponding number. 1.laser, 2.beam guiding, 3.cutting nozzle, 4.coordinate table, 5.control unit, 6.system for energy supply EXERCISE 2 Match A with B. A B EXERCISE 3 Fill in the blank according to the text. 1. laser beam 2. melts 3. gas jet 4. cutting steel. 5. high machining precision EXERCISE 4 Answer the following questions briefly according to the text. 1. When a high energy density laser beam is focused on a small spot on the workpiece by a lens; focused beam melts, vaporizes, or combusts material; molten material is ejected out from the melt area by pressurized gas jet. 2. No physical contact machining. To some extent precision, since there is no wear on the laser. There is also a reduced chance of warping the material that is being cut, as laser systems have a small heat affected zone. 学习学习情境四情境四 任务任务 1 1 习题参考答案习题参考答案 15 EXERCISE 1 Match A with B. EXERCISE 2 Answer the following questions briefly according to the text. 1. Main potential hazards includes: rotating components, such as the tool in the spindle; movable components, such as the machining center table, lathe slides; errors in the program such as changing a proven program randomly. 2. Stop the machine. 3. Because it can be a source of vibration that can break the insert. 4. Choose different cutting conditions. 5. Use a single-block execution function。 EXERCISE 3 Match the pictures with the English words. 1 ( C ) 2 ( D ) 3 ( A ) 4 (B) EXERCISE 4 Complete the following dialogues by translating the parts given in Chinese into English. 1. how to star