数控试题

宋福林 发表于 2005-12-6 10:55:54

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深圳职业技术学院<o:p></o:p>
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           课程编码 1810009 课程名称 数控机床 学分 3 拟题人 黄海  审题人 李玉炜 
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题  号<o:p></o:p></TD>
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1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
2<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
3<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
4<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
5<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
6<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
7<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
8<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
9<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 21.6pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=29>
10<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 36pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext 1.0pt" vAlign=top width=48>
总分<o:p></o:p></TD></TR>
<TR>
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得  分<o:p></o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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（闭卷，许带圆规、三角尺、计算器等文具）<o:p></o:p>
一、判断题（对的打“〇”，错的打“×”，每题1分，共20分）<o:p></o:p>
（〇）1、加工中心检测过程中,需首件细检，中间抽检。<o:p></o:p>
（×）2、G02是逆时针园弧插补指令。<o:p></o:p>
（〇）3、逐点比较插补法的最大误差小于一个脉冲当量。<o:p></o:p>
（×）4、CNC开环系统的特点一是位置检测元件易于调整。<o:p></o:p>
（×）5、M00和M01指令的功能是完全一样的。<o:p></o:p>
（×）6、从理论上讲,闭环控制的运动精度主要取决于检测装置的精度,而与传动链的误差无关。<o:p></o:p>
（×）7、感应同步器、光栅均可作为增量式测量的检测元件。<o:p></o:p>
（×）8、由于光栅易受污染,所以不能用于数控铣床上。<o:p></o:p>
（〇）9、工作坐标系G54—G59可任意设定，但必须把这几个坐标系之间的距离记下来。<o:p></o:p>
（〇）10、CNC的控制是由数控(NC)和程控(PC)两组装置有机结合来实现的。<o:p></o:p>
（〇）11、G28命令与机床开机后的自动回原点是等效的。<o:p></o:p>
（〇）12、进给功能指令，又称F指令，用来指定刀具相对工件运动的速度。<o:p></o:p>
（〇）13、在使用子程序时,不但可以从主程序调用子程序,子程序也可以调用其它程序。<o:p></o:p>
（〇）14、在CNC机床中,PLC主要用于开关量控制。<o:p></o:p>
（〇）15、加工中心与数铣、数镗的主要区别为：加工中心设置有刀库和换刀系统。<o:p></o:p>
（×）16、用G02编程,加工整圆时,可以使用I、J、K参数,也可以用R参数。<o:p></o:p>
（〇）17、数车的Z轴与车床导轨平行，+Z是离开卡盘的方向。<o:p></o:p>
（〇）18、伺服机构运动时表现为正向间隙,它是运动损失的一部分。<o:p></o:p>
（〇）19、G81是固定循环钻孔指令。<o:p></o:p>
（×）20、数控加工不需要工序卡片。<o:p></o:p>
二、单选题（把最适合的答案编号填入括号内，每题1分，共20分）<o:p></o:p>
（ C ）1、强力切削是采用（   ）的切削方法。<o:p></o:p>
A.高速   B.大切削深度   C.大进给量  D.大切削宽度<o:p></o:p>
（ D ）2、数控机床的精度和速度主要取决于<o:p></o:p>
       A、CPU    B、机床导轨    C、检测元件   D、伺服系统<o:p></o:p>
（ A ）取消固定循环应选用（   ）。<o:p></o:p>
A.G80  B.G81  C.G82  D.G83<o:p></o:p>
（ A ）4、步进电动机没有反馈机构,结构较简单,主要应用在<o:p></o:p>
A.开环方式  B.半闭环方式  C.闭环控制  D.混合环控制<o:p></o:p>
（ C ）5、适于作闭环系统的驱动元件为<o:p></o:p>
       A、步进电机    B、电液脉冲马达    C、交流伺服电机    D、感应同步器<o:p></o:p>
（ A ）6、CNC闭环系统的位置反馈信号可以从下列部位取得：<o:p></o:p>
       A、工作台    B、伺服电机轴    C、主轴     D、滚珠丝杠轴<o:p></o:p>
（ D ）7、属于尺寸指令的为：<o:p></o:p>
       A、G92     B、M03    C、F200     D、X100<o:p></o:p>
（ C ）8、机床坐标系原点也称为：<o:p></o:p>
       A、工件零点     B、编程零点      C、机械零点         D、刀具零点<o:p></o:p>
（ D ）9、在立式铣床上，用刀具半径补偿编程加工?20mm圆凸台，试切后为?21mm。若程序和刀半径不变，则设置刀半径补偿量应：<o:p></o:p>
A、增加1mm     B、减少1 mm   C、增加0.5mm    D、减少0.5mm<o:p></o:p>
（ C ）10、G91 G01 X3.0 Y4.0 F100执行后，刀具移动了<o:p></o:p>
A、1     B、3   C、5    D、0.75<o:p></o:p>
（ B ）11、对于一般深度的有深度要求的盲孔（长径比小于5-10），可用哪个命令：<o:p></o:p>
A.G81      B.G82         C.G83          D.G73<o:p></o:p>
（ D ）12、在铣床上进行曲线、圆弧等切削及复杂曲面切削时，需要：<o:p></o:p>
A.点位控制     B.圆弧控制    C.直线控制    D.轮廓控制<o:p></o:p>
（ A ）13、数控机床的柔性是指：<o:p></o:p>
A.对产品更新适应性强    B.生产率较高    C.加工精度高    D.能批量生产<o:p></o:p>
（ C ）14、加工曲面时，采用：<o:p></o:p>
A.端铣刀     B.键槽铣刀     C.球头刀     D.小直径立铣刀<o:p></o:p>
（ C ）15、加工中心主轴转数达到20000r/min以上时，一般采用的润滑方式是：<o:p></o:p>
A.油脂      B.油气       C.喷油      D.以上都可<o:p></o:p>
（ C ）16、伺服装置每发出一个脉冲信号,反映到机床移动部件上的移动量称为（）。<o:p></o:p>
A.位置精度   B.机床定位精度  C.脉冲当量   D.加工精度<o:p></o:p>
（ D ）17、数控铣床的指定刀具补偿值号是用： <o:p></o:p>
A.G      B.T      C. F       D. D<o:p></o:p>
（ C ）18、以下零件哪个不适合在数控铣上加工：<o:p></o:p>
A.曲线轮廓   B.形状复杂尺寸繁多   C.加工余量不稳定  D.不好测量的内腔，凹腔<o:p></o:p>
（ B ）19、数铣加工过程中,按了紧急停止按钮后,应<o:p></o:p>
A.排除故障后接着走   B.手动返回参考点   C.重新装夹工件   D.重新上刀<o:p></o:p>
（ C ）20、1958年第一台加工中心在（   ）的K&T公司问世。<o:p></o:p>
A.英国   B.苏联   C.美国   D.德国<o:p></o:p>
三、填空题（每空0.5分，共15分）<o:p></o:p>
1、数控机床由程序载体、输入装置、数控装置、伺服系统和机床本体以及辅助设备组成。<o:p></o:p>
2、按执行机构的控制方式分类，数控系统分为开环、闭环和半闭环控制系统。<o:p></o:p>
3、CNC系统常见的插补方法有逐点比较法、数字积分法、时间分割法和扩展DDA法。<o:p></o:p>
4、逐点比较法的四个工作节拍为偏差判别、坐标进给、偏差计算、终点判别。<o:p></o:p>
5、在刀具控制中，为了保证精度和编程方便，通常需有刀具半径补偿和刀具长度补偿功能。<o:p></o:p>
6、PLC在数控机床中的主要作用是控制主轴启停、换向、换刀等。（或：工件夹紧、液压、冷却、润滑的开关）<o:p></o:p>
7、数控机床对伺服系统的要求是:精度高、响应快、调速范围宽、良好的稳定性。<o:p></o:p>
8、常用的数控指令有准备功能G指令、坐标功能（如XYZ）指令、M指令、S指令、T指令和F指令。<o:p></o:p>
9、程序字通常是由字母、符号和数字组成。<o:p></o:p>
四、简答题（每题5分，共15分）<o:p></o:p>
1、简述数控机床的加工特点？<o:p></o:p>
答：（1）加工精度高<o:p></o:p>
（2）生产柔性大<o:p></o:p>
（3）劳动强度低<o:p></o:p>
（4）生产效率高<o:p></o:p>
（5）经济效益好<o:p></o:p>
（6）管理现代化<o:p></o:p>
2、加工中心孔加工指令为：G90 G98 G83 X10 Y20 Z-30 R3 Q5 P500 F20 L4，试说明该程序中下列指令的含义：<o:p></o:p>
G98  ----刀具返回到初始点<o:p></o:p>
R3   ----R平面（参考平面）的Z坐标<o:p></o:p>
<H1 style="MARGIN: 0cm 0cm 0pt">Q5   ----每次加工深度</H1>
P500 ----孔底暂定时间500ms<o:p></o:p>
F20  ----孔加工切削进给速度20mm/min<o:p></o:p>
3、简述数控机床对位置测量装置的要求。<o:p></o:p>
答：（1）工作可靠，抗干扰性强<o:p></o:p>
（2）满足精度和速度的要求<o:p></o:p>
（3）使用维护方便<o:p></o:p>
（4）成本低寿命长<o:p></o:p>
（5）便于与数控系统相联<o:p></o:p>
五、编程计算题（共30分）<o:p></o:p>
1、若三相步进电动机的转子齿数为40齿，问在三相三拍和三相六拍的情况下，其步距角α3和α6分别为多少？（4分）<o:p></o:p>
[解]已知：z=40，m=3, 三相三拍时：k=1, 三相六拍时：k=2<o:p></o:p>
故：α3=360o/mzk=360o/（3×40×1）=3o<o:p></o:p>
α6=360o/mzk=360o/（3×40×2）=1.5o<o:p></o:p>
答：步距角α3和α6分别为3o和1.5o<o:p></o:p>
2、根据下列程序%0090（G90方式），画出轨迹图，并用G91方式重新编写一遍，程序名取为%0091。（6分）
   %0090                                                                    
   N10   G92 X0 Y18  S530 M03
   N20   G02 X18 Y0  R18 F100
   N30   G03 X68 Y0  R25
   N40   G02 X88 Y20 R20
   N50   M30
答：（1）%0091 <o:p></o:p>
   N10   G91 S530 M03<o:p></o:p>
   N20   G02 X18 Y-18  R18 F100<o:p></o:p>
   N30   G03 X50 Y0  R25<o:p></o:p>
   N40   G02 X20 Y20 R20<o:p></o:p>
   N50   M30<o:p></o:p>
（2）轨迹图如下<o:p></o:p>
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3、加工第一象限顺圆，圆弧起点为A（1，4），终点为B（4，1），试写出整个计算流程和节拍表，并画出走步轨迹图。（8分）<o:p></o:p>
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步数<o:p></o:p></TD>
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偏差判别<o:p></o:p></TD>
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坐标进给<o:p></o:p></TD>
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偏差计算<o:p></o:p></TD>
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坐标计算<o:p></o:p></TD>
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终点判别<o:p></o:p></TD></TR>
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起点<o:p></o:p></TD>
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<o:p> </o:p></TD>
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<o:p> </o:p></TD>
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F0=0<o:p></o:p></TD>
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X0=1,Y0=4<o:p></o:p></TD>
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Σ=6<o:p></o:p></TD></TR>
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1<o:p></o:p></TD>
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F0=0<o:p></o:p></TD>
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-ΔY<o:p></o:p></TD>
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F1=F0-2Y0+1=-7<o:p></o:p></TD>
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X1=1,Y1=3<o:p></o:p></TD>
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Σ=5<o:p></o:p></TD></TR>
<TR>
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2<o:p></o:p></TD>
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F1=-7<0<o:p></o:p></TD>
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+ΔX<o:p></o:p></TD>
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F2=F1+2X1+1=-7+3=-4<o:p></o:p></TD>
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X2=2,Y2=3<o:p></o:p></TD>
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Σ=4<o:p></o:p></TD></TR>
<TR>
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3<o:p></o:p></TD>
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F2=-4<0<o:p></o:p></TD>
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+ΔX<o:p></o:p></TD>
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F3=F2+2X2+1=-4+5=1<o:p></o:p></TD>
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X3=3,Y3=3<o:p></o:p></TD>
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Σ=3<o:p></o:p></TD></TR>
<TR>
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4<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 64.15pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=86>
F3=1>0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 63pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=84>
-ΔY<o:p></o:p></TD>
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F4=F3-2Y3+1=1-5=-4<o:p></o:p></TD>
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X4=3,Y4=2<o:p></o:p></TD>
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Σ=2<o:p></o:p></TD></TR>
<TR>
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5<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 64.15pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=86>
F4=-4<0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 63pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=84>
+ΔX<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 115.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=154>
F5=F4+2X4+1=-4+7=3<o:p></o:p></TD>
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X5=4,Y5=2<o:p></o:p></TD>
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Σ=1<o:p></o:p></TD></TR>
<TR style="mso-yfti-lastrow: yes">
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6<o:p></o:p></TD>
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F5=3>0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 63pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=84>
-ΔY<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 115.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=154>
F6=F5-2Y3+1=3-3=0<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 63pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=84>
X6=4,Y6=1<o:p></o:p></TD>
<TD style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #ece9d8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #ece9d8; WIDTH: 63pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid windowtext .5pt; mso-border-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" vAlign=top width=84>
Σ=0<o:p></o:p></TD></TR></TBODY></TABLE></DIV>
(计算流程：5分)<o:p></o:p>
走步轨迹图（3分）如下：<o:p></o:p>
<v:shape id=_x0000_i1026 style="WIDTH: 215.25pt; HEIGHT: 162pt" type="#_x0000_t75" o:ole=""><v:imagedata cropright="11615f" cropleft="10385f" o:title="" src="file:///C:\DOCUME~1\cshy\LOCALS~1\Temp\msohtml1\01\clip_image004.wmz"></v:imagedata></v:shape><o:p></o:p>
<o:p> </o:p>
4、如图所示，已知立铣刀半径r=8mm，圆台外径和棱形加工余量为0.5mm,请精铣圆台外径和棱形。（共12分）<o:p></o:p>
(1)若工件中心表面为O（0，0，0）点，试说明G92 X0 Y0 Z10的对刀过程。（4分）<o:p></o:p>
(2)按尺寸画出工件的顺铣刀心轨迹图、起刀点、退刀点（用虚线画）和转接矢量。（4分）<o:p></o:p>
(3)编写精铣程序。（4分）<o:p></o:p>
<o:p> </o:p>
<v:shape id=_x0000_i1027 style="WIDTH: 390.75pt; HEIGHT: 202.5pt" type="#_x0000_t75" o:ole=""><v:imagedata cropright="3378f" cropleft="2319f" o:title="" src="file:///C:\DOCUME~1\cshy\LOCALS~1\Temp\msohtml1\01\clip_image006.wmz" cropbottom="15588f"></v:imagedata></v:shape><o:p></o:p>
第五题，第4小题参考答案图：棱圆<o:p></o:p>
[参考答案]<o:p></o:p>
(1)找X轴中心：刀（可用贴纸法或用分中棒）寻靠工件左边，置G92 X0回车，再按START→寻靠工件右边，记下读数XR , 抬刀高出工件表面→运行G90 G01 X(XR/2),即刀到了工件中心。<o:p></o:p>
同理找Y轴中心。<o:p></o:p>
找Z0点：在工件表面贴一小薄纸片，然后降刀直至纸动，但又不致伤着工件表面，运行G92 Z0即找好Z0点。再上升Z轴10mm,即完成了G92 X0 Y0 Z10的对刀过程<o:p></o:p>
(2)答案见图<o:p></o:p>
(3)精铣程序为<o:p></o:p>
%0286<o:p></o:p>
G92 G90 G17 X0 Y0 Z10 <o:p></o:p>
G00 X-30 Y0 S530 M03<o:p></o:p>
Z2<o:p></o:p>
G01 Z-1 F60<o:p></o:p>
G02 X30 Y0 R30 Z-3<o:p></o:p>
X0 Y30 R30 Z-1<o:p></o:p>
X-30 Y0 R30 Z-3 <o:p></o:p>
X0 Y-30 R30 Z-1<o:p></o:p>
G01  Z2<o:p></o:p>
G00 X-60 Y-45<o:p></o:p>
Z-5<o:p></o:p>
G01 G42 X40 F500 D01<o:p></o:p>
X0 F80<o:p></o:p>
G03 J45<o:p></o:p>
G01 X40 F500<o:p></o:p>
G40 X60<o:p></o:p>
G00 Z10<o:p></o:p>
X0 Y0 M30<o:p></o:p>

w382000 发表于 2006-1-7 23:09:43

Re: 数控试题

好东西这个是好东西

xljflash 发表于 2006-4-5 19:18:08

Re: 数控试题

谢谢分享

wisddd 发表于 2006-4-5 19:51:11

Re: 数控试题

多谢拉。留住有用的

LXQ 发表于 2006-4-7 20:54:27

Re: 数控试题

第五题的程序，
（X0 F80

G03 J45

G01 X40 F500）Ｇ０３　Ｊ４５是什么意思～请问？

dayaner 发表于 2006-4-9 17:28:22

Re: 数控试题

回6楼，是一个整圆，起点和终点坐标一致。终点X,Y值省略。圆心坐标X值和起点一致，I值省略。圆心坐标Y值比起点坐标Y值大45。就是这样的一个整圆。

dayaner 发表于 2006-4-9 17:29:24

Re: 数控试题

是个逆时针的整圆

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