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Assessment 1 Ⅰ. Decide whether the following statements are true(T) or false(F): （10×1%） 1. ( F ) 6. ( F ) 2. ( T ) 7. ( T ) 3. ( F ) 8. ( F ) 4. ( F ) 9. ( T ) 5. ( F ) 10. ( T ) Ⅱ. Select an answer from the four (or three) choices. （10×2%） 1. ( B) 6. ( B ) 2. ( C ) 7. ( A) 3. ( C ) 8. ( A ) 4. ( B ) 9. ( C ) 5. ( C ) 10. ( B ) Ⅲ. Fill in the blanks with the appropriate form of the underlined words. (10×1%) 1. orient 2. precise 3. finished 4. machining 5. automatic或automated 6. accuracy 7. flexible 8. incremental 9. counterclockwise 10. rotary Ⅳ. Match the upper row and the lower row using lines. ( 连线配对 ) (2×5%) Ⅴ. Translate the following passages into Chinese. (3×10%) 1. 编程零点建立数控程序中运动命令的基准点。这使得操作员能从一个公共点开始指定轴运动。如果编程零点选择恰当，程序所需坐标通常可从图纸上直接获得。 2. 数控机床编程包括了几个步骤。编程员开始编程之前，他们必须分析图纸上要完成的功能或要做的工作。然后编程员确定采取的步骤和所需的刀具。完成所有必须的计算后，编程员编写程序，大部分人经常采用CAD系统。 3. code disk码盘 track 码道 shaft 转轴 LED 发光二极管 photo emitter 发光元件 photo transistor 光敏三极管 photo detector 光敏元件 digital output signal 数字输出信号 Ⅵ. Read the following material, and then complete the tasks. (20%) T5 M06 G00 G90 G55 X0.8 Y0.8 S3000 M03 G43 H05 Z0.1 G81 G99 Z-0.8 R0.1 F30. X4.0 Y4.0 X0.8 G80 G00 Z1.0 G28 M30 Assessment 2 Ⅰ. Decide whether the following statements are true(T) or false(F): （10×1%） 1. ( F ) 6. ( T ) 2. ( T ) 7. ( F ) 3. ( T ) 8. ( F ) 4. ( F ) 9. ( F ) 5. ( T ) 10. ( F ) Ⅱ. Select an answer from the four (or three) choices. （10×2%） 1. ( A ) 6. ( B ) 2. ( B ) 7. ( B ) 3. ( B ) 8. ( A ) 4. ( B ) 9. ( C ) 5. ( A ) 10. ( A ) Ⅲ. Fill in the blanks with proper words. (10×2%) 1. position 2. axes 3. setup 4. MDI 5. the bed, column, slide, (servo) motor, ball screw或lead screw 6. more flexible 7. NC 8. RPM 9. cutter radius compensation and tool length compensation 10. rapid traverse或moves, automatic tool changing或change Ⅳ. Match the upper row and the lower row using lines. ( 连线配对 ) (2×5%) Ⅴ. Translate the following passages into Chinese. (2×10%) 1. 程序是一组按其执行次序写出的指令集合，这些指令大致如下： 第1行=选择切削刀具 第2行=主轴转动并选择转速 第3行=开冷却液 第4行=快进至工件的起始位置 第5行=选择适合的进给速度并进行切削 第6行=主轴停止转动，关冷却液 第7行=刀具退至装夹位置并选用下一把刀具 2. CNC代表计算机数字控制，它是通过计算机数字程序控制刀具和工件的运动的多功能的系统。CNC几乎能用于任何普通机床，车间里最常见的数控机床有加工中心（铣床）和车削中心（车床）。 Ⅵ. Composition. Write a short passage on CNC introduction, using the following key words. (20%) Example 1: The CNC machine is different from the traditional machine in terms of automation and precision. It is monitored by a computer module, while the manual machine is monitored totally by man. There are two ways of programming: manual programming via MDI keypad or automatic programming with CAP system. The NC program is loaded and executed from the tape, while today all CNC controls read programs from the computer memory or run programs sent from a computer hard drive which is known as DNC. MCU which means machine control unit processes the NC program, first makes the decoding, next makes calculations for the cutter compensation then makes interpolation along the preprogrammed path. Example 2: In a manual machine, the tool is monitored by man, while in a CNC machine, functions formerly performed by human operators are performed by a computer-control module. On earlier days, the NC program is loaded into and executed from the tape. MCU is the machine controller. MCU firstly makes the decoding, next makes the calculations for the cutter compensation, then makes the interpolation. For simple applications, programming (like drilling holes), the CNC program can be developed manually. Sometimes a manual program is entered into the machine’s controller via its own keypad. This is known as MDI. As applications get more complicated (like machining molds), computer can be used called computer aided programming (CAP). If the program that is to be run is bigger then the capacity of the memory of the CNC control, the program can be run directly from the computer. That is when we refer to DNC as Direct Numeric Control. These days when someone uses the term DNC they are usually referring to Distributed Numerical Control. Usually this type of system has additional provision for the management, display and editing of NC part programs. Assessment 3 Ⅰ. Decide whether the following statements are true(T) or false(F): （10×1%） 1. ( T ) 6. ( T ) 2. ( F ) 7. ( T ) 3. ( T ) 8. ( T ) 4. ( T ) 9. ( F ) 5. ( F ) 10. ( F ) Ⅱ. Select an answer from the four (or three) choices. （10×2%） 1. ( A ) 6. ( B ) 2. ( B ) 7. ( C ) 3. ( A ) 8. ( B ) 4. ( D ) 9. ( A ) 5. ( B ) 10. ( C ) Ⅲ. Fill in the blanks with proper words. (10×2%) 1. good surface finish 2. the lead of the thread 3. Stub drills 4. automatically positioned 5. vertical and horizontal 6. Constant Surface Speed (CSS) 7. reference (point) 或zero (point) 8. offset 9. linear, circular 10. vibration Ⅳ. Match the upper row and the lower row using lines. ( 连线配对 ) (2×5%) Ⅴ. Translate the following passages into Chinese. (2×10%) 1. 在绝大多数现代数控机床上，执行元件是伺服电机，控制系统为闭环反馈系统，通过编码器提供工作台的实际位置反馈，这个反馈用于控制运动速度。采用步进电机的机床以离散长度单位运动，因为输入到步进电机的每个脉冲使步进电机旋转一个固定的小角度。 2. 例如，对于通用斜床身式车削中心，编程员应该知道最基本的机床部件，包括床身、导轨系统、床头箱和主轴、转塔刀架结构、尾架以及工件夹紧装置。 Ⅵ. Read the following material, and then complete the tasks. (20%) A. Decide whether the following statements are true (T) or false (F): (4%) 1. ( F ) 2. ( T ) 3. ( F ) 4. ( F ) B. Fill in the blanks with the following words, changing their forms if necessary. (6%) 1. are sent or received 2. be shielded 3. baud rate , parity , stop bits ， number data bits C. Calculation: (4%) Assessment 4 Ⅰ. Decide whether the following statements are true(T) or false(F): （10×1%） 1. ( T ) 6. ( T ) 2. ( F ) 7. ( F ) 3. ( F ) 8. ( T ) 4. ( F ) 9. ( F ) 5. ( T ) 10. ( F ) Ⅱ. Select an answer from the four (or three) choices. （10×2%） 1. ( B ) 6. ( B ) 2. ( B ) 7. ( B ) 3. ( A ) 8. ( A ) 4. ( D ) 9. ( B ) 5. ( D ) 10. ( C ) Ⅲ. After reading the list of terms, you are required to find the Chinese equivalents in the table below. Then you should fill the brackets with the corresponding letters. (10×1%) 1. ( G ) 数控系统 2. ( F ) 坐标系 3. ( D ) 钻削中心 4. ( M ) 回参考点 5. ( I ) 单程序段 6. ( H ) 直线插补 7. ( A ) 刀库 8. ( K ) 夹具 9. ( J ) 装夹步骤 10. ( B ) 粗铣 Ⅳ. Translate the following technical phrases into Chinese. (10×2%) 1. 计算机数控 2. 计算机辅助编程 3. 三轴联动 4. 伺服控制 5. 普通车床 6. 卧式加工中心 7. 装卸工件 8. 轮廓铣削 9. 在线测量 10. 成品件 Ⅴ. Translate the following passages into Chinese. (2×10%) 1. 编码器通常发出脉冲信号（如每转500脉冲），丝杠将电机的旋转运动转换为工作台的直线运动，丝杠的螺距是连续螺纹之间的水平距离。绝大多数丝杠具有单头螺纹（称为单螺纹丝杠），此时，螺距等于1转内工作台运动的水平距离。机床工作台可以编程移动的最小距离（机床的程编分辨率）称为脉冲当量（BLU）。 2. 数控系统对数控程序进行翻译，按顺序激活一连串的命令。数控系统阅读程序时，会激活相应的机床功能，产生轴运动，总而言之，执行程序中所给的指令。 Ⅵ. Read the following material, and then complete the tasks. (20%) 1. 2. A. table 工作台 spindle 主轴 cutting tool刀具 part surface工件表面 B. 第二和第三行分开写的主要原因是安全。如果写在同一行里，所有的三个轴将同时移动，很可能造成刀具与夹具干涉，从而损坏夹具，甚至损坏机床。 Assessment 5 Ⅰ. Decide whether the following statements are true(T) or false(F): （10×1%） 1. ( T ) 6. ( F ) 2. ( F ) 7. ( T ) 3. ( T ) 8. ( F ) 4. ( T ) 9. ( F ) 5. ( F ) 10. ( T ) Ⅱ. Select an answer from the four (or three) choices. （10×2%） 1. ( B ) 6. ( C ) 2. ( A ) 7. ( B ) 3. ( B ) 8. ( C ) 4. ( A ) 9. ( B ) 5. ( A ) 10. ( C ) Ⅲ. You are required to find the English explanations for the list of terms. Then you should fill the brackets with the corresponding letters. (10×1%) Ⅳ. After reading the list of terms, you are required to find the Chinese equivalents in the table below. Then you should fill the brackets with the corresponding letters. (10×1%)
Ⅴ. Translate the following passages into Chinese. (3×10%) 1. 通过正确判断当时的故障情况，许多问题很容易解决。所有机床操作都是由程序、刀具和加工方法组成。在认定一个故障之前，首先看看这三项工作情况。如果由于镗杆过长使得镗刀振动，不要指望机床修复这种故障。如果虎钳将工件压弯，不要怀疑机床精度。如果不打中心孔，不要断定是孔定位不准。 2. 数控机床编程员的就业机会增长预计2006年中会放缓。数控操作工的前景会好些，就业机会增长预计2006年中会比平均增长率快些。 3. 这些机床有三个直线轴X、Y和 Z。X轴使工作台左右运动，Y轴使工作台前后运动，Z轴使铣头上下运动。机床零点位置位于铣床工作台的右上角，所有基于该点的移动都在机床的负方向上。如果安装了回转台，则提供附加A轴工件偏置。 Ⅵ. Read the following material, and then complete the tasks. (20%) Task 1: Decide whether the following statements are true (T) or false (F): 1. ( F ) 2. ( T ) 3. ( T ) 4. ( F ) 5. ( T ) Task 2: Fill in the blanks with the following words, changing their forms if necessary. 1. record 2. angle 3. source 4. transferred 5. Incremental Task 3: Translate the inclined part of the passage. 增量式编码器（如图A5-1所示）每转提供一定数目的电脉冲。旋转的数目测量了运动的距离或角度。增量式编码器基于光电扫描码盘工作，发光二极管作为光源。
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