当前位置:文档之家› 【2019年新版】电大《数控加工工艺》期末考试复习题参考资料

【2019年新版】电大《数控加工工艺》期末考试复习题参考资料

【2019年新版】电大《数控加工工艺》期末考试复习题参考资料
【2019年新版】电大《数控加工工艺》期末考试复习题参考资料

【2019年新版】电大《数控加工工艺》期末考试复习题参考资料

一、单项选择题:

1.滚珠丝杠副消除轴向间隙的目的主要是( C )。

A.减小摩擦力矩

B.提高使用寿命

C.提高反向传动精度

D.增大驱动力矩

2.切削用量三要素中,对刀具耐用度影响程度大小依次为( C )。

3.切断、车端面时,刀尖的安装位置应( B ),否则容易打刀。

A.比轴中心略低一些 C.比轴中心稍高一些

B.与轴中心线等高 D.与轴中心线高度无关

4.用立铣刀加工内轮廓时,铣刀半径应( B )工件内轮廓最小曲率半径。

A.大于 C.与内轮廓曲率半径无关

B.小于或等于

5.轴类零件采用V形块定位时,一个窄V形块限制的自由度数目为( C )。

A.三个 C.二个

B.四个 D.一个

6.HSK刀柄柄部锥度为( B )

A.7:24

B.1:10

C.1:5

D.1:12

7.螺纹千分尺用于测量螺纹的( A )。

A.中径 C.小径

B.大径. D.三个都能测

8.用硬质合金铰刀铰削塑性金属材料时,由于工件弹性变形的影响,容易出现(A )现象。

A.孔径收缩 C.孔径扩张

B.孔径不变 D.不确定

9.( A )切削过程平稳,切削力波动小。

A.带状切屑

B.节状切屑

C .粒状切屑 D.崩碎切屑

10.用切断车刀从外圆向中心切断时,其工作后角大小的变化规律为( A )

A.由大变小

B.不变

C.由小变大

D.没有规律

11.为提高切削刃强度和耐冲击能力,脆性刀具材料通常选用( B )

A.正前角 C. 0度前角

B.负前角 D.任意前角

12.车阶梯轴时,需选用( A )的刀具。

13.工件以圆孔用单锥销定位,限制自由度数目为( B )

A. 2个

B. 3个

C. 4个

D. 1个

14.下列关于尺寸链叙述正确的是( C )。

A.由相互联系的尺寸按顺序排列的链环

B.一个尺寸链可以有一个以上封闭环

C.在极值算法中,封闭环公差大于任一组成环公差

D.分析尺寸链时,与尺寸链中的组成数目多少无关

15.零件的相互位置精度主妻限制( D ).

A.加工表面与其基准间尺寸误差不超过一定的范围

B.限制加工表面的宏观几何形状误差

C.限制加工表面的微观几何形状误差

D.限制加工表面与其基准间的相互位置误差

16.数控机床上精加工协30以上孔时,通常采用( A )

A. 镗孔 C.钻孔

B.铰孔 D.铣孔

17.采用刀具预调仪对刀具组件进行尺寸预调,主要是预调整( B )

A..几何角度 c.粗糙度

B.轴向和径向尺寸

18.利用机械摩擦原理夹紧工件的夹紧机构中,( A )是最基本的形式.

A.斜楔夹紧机构 C.偏心夹紧机构

B.螺旋夹紧机构 D.压板夹紧机构

19.下列叙述中,除( B )外,均可用数控车床进行加工。

A.轮廓形状特别复杂或难于控制尺寸的回转体零件

B.箱体零件

C.精度要求高的回转体类零件

D.特殊的螺旋类零件

20.在下列内容中,不属于工艺基准的是( D )

A.定位基准 c.装配基准

B.测量基准 D.设计基准

21.一面二销”定位方式限制的自由度数目为( B )

A.三个 C.四个

B.六个 D.五个

22.数控编程时,通常用指令表示刀具.与工件的相对运动速度,其大小为( C )

A.每转进给量f C.进给速度vi

B.每齿进给量.fz D.线速度vc

23.切削用量三要素中.对切削温度影响最大的是( C )。

A.切削深度

B.进给量

C.切削速度

D.主轴转速

24.车细长轴时,要使用中心架或限刀架来增加工件的( C )

A.韧性

B.强度 c 刚度 D.稳定性

25.精加工时切削用量的选择原则( A ),最后在保证刀具耐用度的前提,尽可能选择较高的切削速度v。

A.首先根据粗加工后余量确定a p,其次根据粗糙度要求选择较小的f

B.首先选择尽可能小a p,.其次选掸较大的f

C.首选择尽可能大的a p,其次选择较大的f,

D.首先选择尽能小的a p,其次选择较小的f

26.根据加工要求规定的( C )中间部分的平均磨损量VB允许的最大流称为刀具的磨钝标准。

A.前刀面

B.副后刀面

C..主后刀面

D.切削刃

27.工件的六个白由度全部被夹具中的定位元件所限制的定位方式称为( A )。

A.完全定位

B.欠定位

C.过定位

D.不完全定位

28.加工中心常按工序集中原则划分工序.( D )不是工序集中原则的优点。

A.提高生产效率

B.缩短工艺路线

C.保证各加工表面间相互位位置精度

D.优化切削用量

29.精镗位置精度要求较高的孔系零件时,应采用( A )的方法确定竣孔路线,以避免传

动系统反向问隙对孔定位精度的影晌。

A.单向趋近定位点

B.反向趋近定位点

C.双向趋近定位点

D.任意方向趋近定位点

30,用硬质合金铰刀仪削塑件金属材料时,若转速太高,容易出现( A )现象。

A.孔径收缩B孔径不变

C.孔径扩张

D.不确定

31,车加凹形轮廓工件时,若刀具的(A ) 选择不当,.会造成刀具与工件发生干涉。

A.主,副偏角

B.前角

C.后角

D.刃倾角

32.祖车细长轴外圆时. 刀尖安装位置略高于轴中心线的目的是(B )

A.增加刚度

B.增加阻尼以减小振动

C.保证加工精度

D.提高刀具使用寿命

33. 下列关于尺寸链叙述正确的是( B )。

A.由相联系的尺寸按顺序排列的链环

B.一个尺寸链中只能有一个封闭环

C.在极值算法中,封m环公差有可能小于某一组成环公差

D.分析尺寸链时,与尺寸链中的组成环致目多少无关

34,加工中心常采用基准统一原则加工零件.目的是保证各加工面的( A )。

A.相互位址精度

B.尺寸精度

C表面粗糙度

D.形状精度

35.高速钢刀具的合理前角( B )硬质合金刀其的合理前角。

A.小于

B.大于

C.等于

D.与刀具材利无关

36.浮动支承的主要目的是提高工件的刚性和巷定性,限制〔B 〕个自由度。

A.0

B.1

C.2

D.3

37.加工中心上加I.螺纹时,( B 〕以下螺纹不宜采用机用丝锥攻丝方法加工。

A.M10 C. M20

B. M6 D.M30

38.当零件的内腔和外形采用统一的几何类型和尺寸时,有许多优点。下列( D )不是其优点。

A.减少刀具规格 c.提高生产效率

B.减少换刀次数 D.保证加一精度

39.车削阶梯轴时,主偏角的大小应满足( A )。

40.切削用量三要素中,对切削力影响最小的为( B ).

A.f

B.a

C.u

D.一样大

41.粗车细长轴外圆时,刀尖安装位置略高于轴中心线的0的是(B ).

A.增加刚度

B.增加阻尼以减小振动

C.保证加工精度

D.提高刀具使用寿命

42.金属切削过程的三个变形区中,( C )的金属变形将影响到工件的表面质里和使用性能。

A.第一变形区 C.第三变形区

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