电大数控编程技术期末复习考试试题参考资料(数控编程技术题库及答案电大考试)

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电大数控编程技术期末复习考试试题参考资料(数控编程技术题库及答案电大考试)

  电大《数控编程技术》课程 基本功能指令的编程方法 一、填空题 1、用于控制开关量的功能指令是 。

  2、T0400的含义是 。

  3、采用恒线速度控制车削带锥度的外圆时,若线速度为200米/分钟,最高转速限定在1300转/分钟,正确的编程格式为 。

  4、直线进给率的单位为 ;

  旋转进给率的单位为 。

  5、只有当机床操作面板上的“选择停止键”被按下,才能生效的暂停指令是 。

  二、填空题 1、G96 S150 表示切削点线速度控制在( 2、程序结束,并返回到起始位置的指令是( )。

  (A)M00 (B)M01 (C)M02 (D)M30 3、下列辅助功能,用于控制换刀的指令时( )。

  (A)M05 (B)M06 (C)M08 (D)M09 4、当执行M02指令时,机床( )。

  (A)进给停止、冷却液关闭、主轴不停 (B)主轴停止、进给停止、冷却液关闭,但程序可以继续执行 (C)主轴停止、进给停止、冷却液未关闭、程序返回至开始状态 (D)主轴停止、进给停止、冷却液关闭、程序结束 三、判断题 1、恒线速控制的原理是当工件的直径越大,进给速度越慢。( )

  2、有些车削数控系统,选择刀具和刀具补偿号只用T指令;

  而铣削数控系统,通常用T指令指定刀具,用D、H代码指定刀具补偿号。( )

  3、用M02和M30作为程序结束语句的效果是相同的。( )

  四、简答题 1、指令M00和M01有什么相同点?区别是什么 ? 2、在M功能代码中,与主轴相关的代码是哪些? 3、若某一程序没有指定T功能,该程序能够正常使用吗?为什么? 常用准备功能指令的编程方法 一、填空题 1、用于进行平面选择的G代码是 。

  2、在编写圆弧插补程序时,若用半径R指定圆心位置,不能描述 。

  3、在程序中,第一次出现G01、G02、G03等插补指令时,必须编写 指令。

  4、在FANUC数控系统中,程序段G04 P2000 的含义是 。而G04 的含义是 。

  5、圆心坐标I、J、K表示圆弧 到圆弧 所作矢量分别在X、Y、Z轴上的分矢量。

  二、选择题 1、( )指令与其它三个指令不属于同组G代码。

  (A)G53 (B)G54 (C)G55 (D)G56 2、在同一程序段中使用两个同组G指令,则( )。

  (A)最后一个有效 (B)第一个有效 (C)同时有效 (D)视具体情况而定 3、FANUC系统中,通过中间点返回参考点指令是( )。

  (A)G27 (B)G28 (C)G29 (D)G30 4、程序段写为G91 G0 X100 Y0 F100时( )。

  (A)刀具以100 mm/min的速度移动至(100,0)处 (B)刀具以机床给定的速度移动至(100,0)处 (C)刀具以100 mm/min的速度在X方向移动100 mm,Y向不动 (D)刀具以机床给定的速度在X方向移动100 mm,Y向不动 5、在G55中设置的数值是( )。

  (A)工件坐标系的原点相对机床坐标系原点偏移量 (B)刀具的长度偏差值 (C)工件坐标系的原点 (D)工件坐标系原点相对于对刀点的偏移量 6、数控系统中,( )指令在加工过程中是模态的。

  (A)G01、F (B)G27、G28 (C)G04 (D)M02 7、在使用G54~G59指令建立工件坐标系时,就不再用( )指令。

  (A)G90 (B)G17 (C)G49 (D)G92 三、判断题 1、G90/G91是用于绝对/增量尺寸选择的代码,无论什么数控系统,都必须用这两个代码进行绝对/增量尺寸的模式转换。( )

  2、在平面内任意两点移动,用G00与G01编程的刀具运动轨迹相同,只是运动速度不同。( )

  3、G00指令下的移动速度可以由F代码改变。( )

  4、用R指定圆弧半径大小时,当R为“-”值时,说明该圆弧的圆心角小于180°。( )

  5、使用快速定位指令G00时,刀具运动轨迹可能是折线,因此,要注意防止出现刀具与工件干涉现象。( )

  四、简答题 1、配置前置刀架和后置刀架的数控车床,加工圆弧时它的顺逆方向有何区别? 2、指令G00和G01有何区别? 五、编程题 1、根据图所示零件的轮廓尺寸,分别在G90、G91方式,用G00、G01指令按刀具轨迹(虚线为快速移动轨迹)写出加工程序,并填入程序单中。

  S 图 车削零件轮廓 表1程序单 N G X Z F 1 2 3 4 5 6 7 8 9 10 11 12 2、仔细阅读下列程序,根据程序单,在坐标网格中画出刀具运行的轨迹和零件轮廓。

  表2 试题2的程序单 N G X Z F 1 G00 X50 Z1 2 G01 Z- F160 3 Z-25 4 X75 5 Z-50 6 Z- 7 X100 Z-75 8 Z-100 9 X101 10 G00 X125 Z25 图 坐标网格 3、根据图所示零件的轮廓尺寸,分别在G90、G91方式,用G00、G01、G02/G03指令按刀具轨迹(虚线为快速移动轨迹)写出加工程序,并填入程序单中。

  S 图 试题3的零件轮廓 N G X Z I K F 1 2 3 4 5 6 7 8 9 10 11 4、零件的形状、尺寸及刀具路线如图所示。在G90方式,用G00、G01、G02/G03指令写出刀具运行轨迹的NC程序,填入程序清单。

  S 图 试题4的零件轮廓 N G X Z I K F 1 2 3 4 5 6 7 8 9 10 11 121314155、加工如图所示零件,利用直线和圆弧插补指令,编写外轮廓精加工和切槽程序。

  图 典型车削零件 刀具补偿指令及其编程方法 一、填空题 1、指令G41的含义是 ;

  指令G42的含义是 。

  2、刀具半径补偿分为 、 、 3个步骤。

  3、取消刀具半径补偿的2种编程方式是 、 。

  4、取消刀具长度补偿的2种编程方式是 、 。

  5、在铣削加工中,采用顺铣时刀具半径补偿为 ;

  采用逆铣时刀具半径补偿为 。

  二、选择题 1、程序段G17 G01 G41 X0 Y0 D01F150中的D01的含义是( )。

  (A)刀具编号 (B)刀具补偿偏置寄存器的编号 (C)直接指示刀具补偿的数值 (D)刀具方位的编号 2、具有刀具半径补偿功能的数控系统,可以利用刀具半径补偿功能,简化编程计算;

  对于大多数数控系统,只有在( )移动指令下,才能实现刀具半径补偿的建立和取消。

  (A)G40 、G41和 G42 (B)G43、G44和G80 (C)G43、G44和G49 (D)G00或G01 3、对于FANUC系统,( )指令不能取消长度补偿? (A)G49 (B)G44 H00 (C)G43 H00 (D)G41 4、在下列程序段中,能够建立刀具长度补偿似( )的程序段。

  (A)G01 G42X100 Y20 D01F200 (B)G02 G41X100 Y20 R50 D01 F200 (C)G01 G43X100 Z20 H01 F200 (D)G03 G42X100 Y20 R50 H01 F200 5、在数控铣削加工中,刀具补偿功能除对刀具半径进行补偿外,在用同一把刀进行粗、精加工时,还可进行加工余量的补偿,设刀具半径为r,精加工时半径方向余量为△,则最后一次粗加工走刀的半径补偿量为( )。

  (A)r (B)r+△ (C)△ (D)2 r+△ 6、刀具长度补偿值的地址用( )。

  (A)D×× (B)H×× (C)R×× (D)J×× 7、执行G90 G01 G44 H02 Z-50 F100(H02为2mm)程序段后,刀具的实际移动距离为( )。

  (A)48 mm (B)52 mm (C)50 mm (D)54 mm 三、判断题 1、对于FANUC系统,G43与G44的刀具长度偏置补偿方向是一致的。( )

  2、对于没有刀具半径补偿功能的数控系统,编程时不需要计算刀具中心的运动轨迹,可按零件轮廓编程。( )

  3、轮廓铣削时,刀具补偿的建立与取消一定在轮廓上才能生效。( )

  四、简答题 1、简述刀具补偿的作用? 2、刀具半径补偿的建立与取消,通常在什么移动指令下生效? 3、当立铣刀的长度磨损后,刀具长度补偿值取正值还是取负值? 五、编程题 1、刀具起点在(-40,0),法向切入(-20,0)点,切一个f40 mm的整圆工件,并法向切出返回点(-40,0),刀具轨迹如图所示。利用刀具半径补偿指令,编写零件的轮廓加工程序。

  图 轮廓铣削刀具轨迹 2、用f16的立铣刀精铣 f34mm的孔,孔深为12 mm,工件坐标系原点为孔的中心与上表面的交点处,要求切向进退刀和刀具半径补偿功能,试编写加工程序。

  3、如图所示。零件的左端外圆f64尺寸已加工完毕,利用刀尖圆弧半径补偿功能,编写零件右端外轮廓的精加工程序。

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  R15 请您删除一下内容,O(∩_∩)O谢谢!!!2015年中央电大期末复习考试小抄大全,电大期末考试必备小抄,电大考试必过小抄请您删除一下内容,O(∩_∩)O谢谢!!!2015年中央电大期末复习考试小抄大全,电大期末考试必备小抄,电大考试必过小抄The battle for young viewers CCTV is embracing Internet culture and working with independent producers on TV shows to woo audiences under 35. Han Bing bin reports. After charming audiences with his warm smile for 14 years, China Central Television host Li Jiaming recently found himself targeted by a group of young netizens unhappy with his style. The complaints came after Li hosted the premiere of Rising Star on Oct 31. It is a singing competition show that originated in Israel. Many young netizens found his hosting style slow and boring and mocked it as “CCTV evening gala style“. They even initiated an online campaign to replace him. The 40-year-old host's reaction to the criticism was surprising. During the second episode, he jokingly called himself “the slow Jiaming“ and acted much younger, talking faster and louder. “It's like selling a product. When the customers file a complaint, you must change,“ says Li. “In the Internet age, you get feedback very quickly. These young people are so cute. When you're willing to change for them, they will quickly like you back.“ In order to win more young viewers, CCTV is relying on programs such as Rising Star to embrace Internet culture. In Rising Star, a studio audience and fans watching on television vote for their favorite singers in real time, using the instant-messaging app WeChat. Rising Star was designed to be a live broadcast, but the Chinese version isn't because of policy reasons. Still, WeChat votes by viewers at home are still a major factor in determining which contestants advance to the next round. In the show's latest episode, more than million votes were cast via WeChat. “Now the competition among entertainment shows is very fierce. Audiences have more diverse needs. CCTV needs to embrace an open attitude, interact with young audiences and blend with the Internet,“ says Lyu Yitao, director of CCTV's entertainment channel. The producer of Rising Star, Enlight Media, says the program will have “a phenomenal effect“ given CCTV's audience base nationwide. “But it comes with a challenge,“ says Zhang Hang, chief producer of the program and CEO of Enlight Media's TV business. Unlike top-ranking provincial satellite channels such as Hunan TV, which have a large base of young fans thanks to a series of phenomenally popular entertainment and reality shows, CCTV productions are usually more conservative and serious, and thus have a much older audience base. “If we were to run this program on Hunan, we may attract twice as many viewers,“ says Zhang. “But since we didn't make it there, we now have to make the best out of the given conditions. And it means we have to make certain compromises.“ When the current season of Rising Star ends, Zhang says his company will conduct an overall evaluation of the program and make adjustments for future seasons. Although audience ratings haven't lived up to Zhang's expectations, he says the program has already helped CCTV attract more young people. According to Enlight Media, the number of people ages 15 to 35 who watched the first episode of Rising Star was 76 percent higher than the usual audience for CCTV entertainment productions. In order to attract young audiences, CCTV has been working with independent production companies. As one of CCTV's closest partners, Enlight Media has produced several entertainment and reality shows for the company's channels, including the Chinese version of The Biggest Loser on CCTV's business channel and an original teenager talent show Shaonian Zhongguo-qiang (Strong Young Chinese) on CCTV1. This year CCTV also licensed EE-Media, the producer of the popular Super Girl talent shows, to produce the talk show Hi! 2014, hosted by Taiwan pop star Harlem Yu and one of China's most popular TV stars Xie Na. The show is geared toward younger audiences. Canxing Productions, which rose to fame with the success of its Voice of China series on Zhejiang TV, also produced two talent shows for CCTV. One is an original production called Songs of China, which ended up as one of CCTV's most watched programs of 2014. The State Administration of Press, Publication, Radio, Film and Television announced earlier this year that, starting in 2015, only one music talent show can be aired nationwide during prime time each season, and there can be only one program based on foreign formats each year. However, domestic media report that such policies don't apply to CCTV, meaning it will become a highly desired platform by production companies. Wang Changtian, CEO of Enlight Media, confirmed to the Shanghai Securities News that its programs scheduled to air on CCTV next year, which include at least two reality shows, won't be affected. A kung fu-themed reality show, produced by Canxing, is also reportedly scheduled to run on CCTV next year. CCTV is “very active. The level of its acceptance of new ideas is even beyond my imagination,“ says Zhang Hang. “Our cooperation with CCTV will surely continue.“ When winter comes, nothing is more relaxing than a hot spring bath. For thousands of years, natural mineral-rich hot spring baths have also been used to relieve health ailments. The water found in natural hot springs contains a variety of different minerals, and the most common one is sulfur. It has a “rotten egg“ smell but is excellent for skin. The sulfur-containing water might be just what the doctor ordered when it comes to relieving pain, stress, itchy skin, arthritis and more. Hot springs resorts are thriving as biting cold winter arrives. Here we take a look at some of the best natural hot springs China has to offer.

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