数控技术专业英语试卷数控b.doc

    兰州工业学院 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 题目 一 二 三 四 五 六 七 八 九 十 十一 总分 分数 一、Translate the following words into Chinese(本大题共20小题，每小题分，共0分)grinding 6. drill 7. spindle 8. profilometer 9. stiffness 10. forging 11. reamer 12. magazine 13. headstock 14. burr 15. encoder 16. allowance 17. tranducer 18. grooving 19. offset 20. thread 二、Translate the following phrases into Chinese(本大题共小题，每小题2分，共分)heat treatment 2. computer aided process planning 3.clearance fit 4. hole-basis system 5. positional tolerancing 6. tool holder 7. atomic-force microscope 8. machine zero 9. carbon steel 10.preparatory function 11. cutter radius compensation 12. rake angle 13. end milling 14. wear resistance 15. tool life 系主任签字： 日期： 教研室主任签字： 日期： 姓名 班级 学号 密 封 线 三、Translate the following sentences into Chinese(本大题共0分) Material-removal processes are desirable or even necessary in manufacturing operations for the following reasons: (20分) Closer dimensional accuracy ay be required than is available from casting. forming, or shaping processes alone. For example, in the forged crankshaft, the bearing surfaces and the holes cannot be produced with good dimensional accuracy and surface finish solely by forming and shaping processes. Parts may require 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 discoloration, they generally require additional finishing operations, such as grinding, to obtain the desired final dimensions and