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1、系主任签字：日期：教研室主任签字：日期：试卷袋号兰州工业学院姓名2012 2013学年第1 学期期末考试试卷科目 专业英语考试班级数控 10-1，2考试日期10 月 25 日本试卷共 4 页密题目一二三四五六七八九十十一总分分数班级封一、 Translate the following words into Chinese(本大题共 20 小题，每小题 1 分，共 20 分)1.gear2.bear3.boring4.dimension5.grinding6.drill7.spindle8.profilometer9.stiffness10.forging11.reamer12.magazin
2、e13.headstock14.burr15.encoder16.allowance17.tranducer18.grooving19.offset20.thread学号线二、 Translate the following phrases into Chinese(本大题共15小题，每小题 2 分，共 30 分)1. heat treatment2. computer aided process planning 3.clearance fit4. hole-basis system5. positional tolerancing6. tool holder7. atomic-force
3、microscope8. machine zero9. carbon steel 10.preparatory function11. cutter radius compensation12. rake angle第 1 页三、 Translate the following sentences into Chinese(本大题共50 分)1. Material-removal processes are desirable or even necessary in manufacturing operations for the following reasons:(20 分)Closer
4、 dimensional accuracy may be required than is available from casting. forming, or shaping processes alone. For example, in the forged crankshaft, the bearingsurfaces and the holes cannot be produced with good dimensional accuracy and surface finish solely by forming and shaping processes.Parts may r
5、equire external and internal geometric features, as well as sharp corner and flatness, which cannot be produced by forming and shaping processes.Some parts are subjected to various heat treatments for improved hardness and wear resistance. Since these parts may undergo distortion and surface discolo
6、ration, they generally require additional finishing operations, such as grinding, to obtain the desired final dimensions and surface finish.Parts may require special surface characteristics or surface texture: that cannot be produced by other means.Machining the part may be more economical than manu
7、facturing it by other processes, particularly if the number of parts desired is relatively small.第 2 页2. Because steels are among the most important engineering materials, their machinability has been studied extensively. Carbon steels have a wide range of machinability, depending on their ductility
8、 and hardness. If too ductile, chip formation can produce built-up edge, leading to poor surface finish; if the steel is too hard, it can cause abrasive wear of the tool because of the presence of carbides in the steel. Cold-worked carbon steels are desirable from a machinability standpoint(10. 分)3.
9、 Turning means that the part is rotating while it is being machined. The starting material is usually a workpiece that has been made by other processes, such as casting, forging, extrusion, or drawing. Turning, to produce straight, conical, curved, or grooved workpiece such as shafts, spindles, and
10、pins. Facing, to produce a flat surface at the end of the part, which is useful for parts that are attached to other components, or face grooving to produce grooves for O-ring seats.(10 分 )第 3 页4. Numerical control has been used in industry for more than 40 years. Simply put, numerical control is a
11、method of automatically operating a manufacturing machine based on a code of letters, numbers, and special characters. A complete set of coded instructions for executing an operation is called a program. The program is translated into corresponding electrical signals for input to motors that run the
12、 machine. Numerical control machines can be programmed manually. If a computer is used to create a program, the process is known as computer-aided programming(10. 分)第 4 页兰州工业学院20122013 学年第1 学期期末考试试卷参考答案及评分标准科目 专业英语考试班级数控 10-1、2本答案编写人高成秀共 1 页一、 Translate the following words into Chinese(1 分，共 20 分)本大
13、题共20 小题，每小题1. 齿轮2. 轴承3.镗削4.尺寸5. 磨削6. 钻10. 锻压11. 绞刀12. 刀库13. 床头箱差17. 传感器18. 切槽19.偏置20.螺纹7.主轴14. 毛刺8. 表面轮廓仪15 编码器9. 刚度16. 公二、 Translate the following phrases into Chinese(本大题共15 小题，每小题 2分，共 30分)1.热处理2.计算机辅助工艺设计7.原子力显微镜8. 机床原点13.立铣14.耐磨性15.刀具耐用度3.间隙配合4.基孔制5.定位公差9.碳钢10.准备功能11.刀具半径补偿6.刀柄12.前角三、 Translate
14、 the following sentences into Chinese(本大题共50 分)1. 在制造过程中材料去除工艺是必要的，主要有以下原因：(20 分 )可以获得比铸造、锻造、成型工艺获得的尺寸精度高。例如：锻造机轴，仅仅通过成型加工受力表面和孔不能获得高的尺寸精度和表面精度。零件有内外几何特征、尖角、，这些成型工艺不能够完成一些零件要进行各种热处理来改善硬度和耐磨性。由于这些零件可能经受变形和表面污染，他们需要额外的精加工，比如磨削，以获得预期的尺寸和表面质量。零件需要特定的表面特征和表面形貌：这些其它工艺不能完成。切削加工可能比其它工艺过程经济，尤其零件生产批量小的时候。2. 因
15、为钢是最重要的工程材料之一，它的切削加工性得到广泛研究。根据其塑性和硬度，碳钢切削加工性广。如果塑性高容易产生积屑瘤，使表面光洁度差；如果太硬，因为钢中的碳引起刀具磨损。从切削性能讲冷作碳钢是理想材料。(10 分)3. 车削是加工时零件回转。工件原材料通常由其它工艺制造，如铸造、锻造、挤压成形、拉拔，车削加工直线、锥、曲线或槽，如轴、主轴、钉。平端面在零件端部加工平面，零件装到其它部件上时用到平面，或在端面切O 形圈槽。(10 分)4. 数控在工厂使用已经 40 多年了。 简单讲， 数控是基于字母、 数字和特定符号代码自动操作制造机器的方法。完成一个操作的完整代码指令叫做程序。程序翻译成相应的电信号输出给电机来驱动机床。数控机床可以手工编程。如果计算机生成程序，这个过程叫做计算机辅助第 1 页