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1、系主任签字：日期：教研室主任签字：日期：试卷袋号兰州工业高等专科学校姓名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考试日期月日本试卷共 3 页密题目一二三四五六七八九十十一总分分数班级封学号线一、 Translate the following words into Chinese(本大题共 20 小题，每小题 1 分，共 15 分)1mechanism9faceplate2turret10counterweight3tap11runout4bed12carriage5tailstock13saddle6way14apron7transmission
2、15stiffness8chuck二、 Translate the following phrases into Chinese(本大题共 15小题，每小题 1 分，共 15 分)1control panel控制面板2machine panel操作面板3CYCLE START循环启动4FEED HOLD进给保持5manual pulse generator (MPG)手摇脉冲发生器6toggle switch拨动开关7SINGLE BLOCK单段8MACHINE LOCK机床锁定9OPTIONAL BLOCK SKIP跳过程序段10OPTIONAL BLOCK STOP计划停止11automa
3、tic tool changer自动换刀装置12tool holder第 1 页刀杆, 刀柄三、 Translate the following sentences into Chinese(本大题共70 分)1. (20 分 ) Safety rules for programming CNC lathesAlways check for any interference between the workpiece, the tooling setups, and the indexing of each turret face.Always select cutters, holders,
4、 and turret accessories that provide maximum rigidity for holding during machining.Select speeds and feeds that permit machining at optimum efficiency and safety.Reduce the speed and feed:When drilling large-diameter holes to a depth greater than twice the drill size.When cutting threadWhen finished
5、 cutting an internal taper, always feed the tool in the direction of the large diameter.During rough turning, pay attention to the following:The effect of longitudinal, tangential, and radial forces.The heat generated between the workpiece and tool.2. (20 分 ) CNC lathe programs can be written to mov
6、e the tool in the following modes: absolute, incremental, or mix (incremental and absolute)Absolute positioningWhen operating in this mode the new position of the tool is given by itsX and Z distances froma fixed home or origin (0,0).Diameter programming:With absolute diameter programming, the X pos
7、ition of the tool isspecified in terms of diameter or twice the distance from the spindle centerline.Incremental positioningWhen operating in this mode, the new position of the tool is specified by inputting its directionand distance from the last position achieved. The addressU is used to indicate
8、incremental X-axismotion and the address W is used to indicate incremental Z-axis movement.Motion toward the spindle centerline on the X-axis is indicated byU and motion away by +U.Motion toward the spindle center on the Z-axis is indicated by W and motion away by +W. Diameter programming: With incr
9、emental diameter programming, U is entered as the directedchange in diameter from the last position achieved.(20 分 )第 2 页3. (30 分 ) Reference point (Machine zero)The reference point or machine zero is the position of the turret when the machines axes arezeroed out. It is set once by the manufacturer
10、. It should be noted that this location in also referred toas the “machine home”position.Machining origin (Tool change position)The machining origin is determined at setup. This location is input at the beginning of the wordaddress program before the first tool change block by means of the “zero-off
11、set ”command. Themachine indexes the tools at this position.The machining origin is determined in such a way that when the turret is at this location thelongest tool is at least 1.0 from the face of the part in the Z-direction and 1.0 from the diameter of the stock. The control is zeroed out at this
12、 location. The turret is then jogged to the reference point. The X and Zlocations of the machine origin from the reference point are recorded, and these number are used in the “zero-offset”command. (1)The tool change position is a safe location the machine returns to when indexing an old toolwith a
13、new tool. It is usually set at the machining origin.The operator can manually home the turret by pressing the“return to referencebutton” on themachine panel. This can be done, for example, if the turret is not homed when the CNC lathe isturned on.Program zeroProgram zero is a point from which all di
14、mensions are defined in the part program. The setup person uses tool offsets as a means of locating the program zero with respect to the machining origin.Upon receiving a programmed X and Z move with respect to the program zero, the controller will compute the corresponding X and Z move relative to
15、the machining origin. It will then executethe move relative to the machining origin.第 3 页第 7 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(本大题共 15 小题，每小题1 分，共 15 分)mechanism机械装置 , 机构 ,faceplate花盘turret转塔刀架counterweight平衡锤tap攻螺纹r
16、unout振摆bed床身carriage托板tailstock尾架saddle床鞍way导轨apron托板箱transmission变速箱stiffness刚度chuck卡盘,夹盘二、 Translate the following phrases into Chinese(本大题共15 小题，每小题1分，共 15分)control panel控制面板machine panel操作面板CYCLE START循环启动FEED HOLD进给保持manual pulse generator (MPG)手摇脉冲发生器toggle switch拨动开关SINGLE BLOCK单段MACHINE LOCK机床锁定OPTIONAL BLOCK SKIP跳过程序段OPTIONAL BLOCK STOP计划停止automatic tool changer自动换刀装置tool holder刀杆 ,刀柄retention knob拉钉turret head转塔头carousel storage鼓轮式刀库三、 Translate the following sentences into Chinese(本大题共 70 分)略第 1 页