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金工实习考试试题

金工实习考试试题
金工实习考试试题

金工实习考试试题

LEKIBM standardization office【IBM5AB- LEKIBMK08- LEKIBM2C】

一、填空题

1、金属在加热过程中可能产生的缺陷有氧化脱碳、过热、过烧和内部裂纹,其中过烧是无法挽救的缺陷。

2、模锻的基本工序是下料、加热、模锻、切边等。

3、铣床的种类有很多,最常用的是立式铣床和卧式铣床,此外还有龙门铣床、万能工具铣床、数控铣床及各种专用铣床。

4、铣床的主要附件有:平口钳、分度头、回转工作台、万能铣头。

5、立式铣床与卧式铣床的主要区别是立式铣床的主轴是与工作台面垂直。

6、砂轮常用的磨料有碳化硅和刚玉两大类。

7、外圆磨床的工作台是采用液压传动方式,它的特点是振动小、运动平稳、可以无极调速。

8、钳工基本操作内容有锉削、划线、锯割、钻孔、攻丝、套丝、刮削、装配等。

9、平面锉削的常用方法有顺向锉、交叉锉、推锉等。

10、钳工加工孔的方法一般指的是钻孔、扩孔、铰孔和锪孔。

11、车工是机加工的主要工具,常用于加工零件的回转表面。

12、车削外圆的步骤是开车对刀、向右退刀、横向进刀、试刀2-3mm长、测量调整、切削加工。

13、车床是利用工件的旋转运动和刀具的相对工件的位移运动来完成切削加工的。前者叫主运动后者叫进给运动。

14、对车刀切削部分材料的性能要求是高硬度、高耐磨性、高耐热性、足够的强度和韧性。

15、工厂常用车刀刀具材料有高速钢、硬质合金。

16、铸造生产方法很多,常分为砂型铸造和特种铸造。

17、特种铸造的方法有熔模铸造、金属性、高压、低压和离心铸造。

18、砂芯应具备强度、耐火度、可塑性、透气性和退让性等基本功能。

19、为了满足型芯砂性能要求,型芯砂一般由原砂、粘合剂、附加物和水按一定比例混合成。

20、手工两箱造型的基本方法有整模造型、分模造型、挖沙造型、活块造型和假箱造型等。

21、显示窗口的切换顺序:图形显示、相对坐标、代码显示。

22电火花切割机组成:机床、控制柜、脉冲电源。工作液作用:冷清绝缘、灭弧和排屑。

23、电火花切割:用钳丝与工件之间脉冲进行火化放点时产生的电腐蚀现象对材料加工。

二、选择题

1、铣平面最常用的铣削方法是(2)。

(1)对称铣削法(2)逆铣(3)顺铣

2、用来制造铣刀的材料主要是(3)

(1)碳素工具钢(2)合金工具钢(3)高速钢

5、铣削过程中的主运动是(2)。

(1)工作台的进给(2)铣刀旋转(3)工件的的移动

6、磨削一般钢材料选(2)磨料。

(1)白刚玉(2)棕刚玉(3)黑色碳化硅

7、砂轮的硬度是指(3)。

(1)砂轮的软硬程度(2)磨粒本身的硬度(3)磨粒从砂轮表面脱落下列的难易程度

8、锉削平面,若粗锉时用(1)锉法。

(1)交叉锉法(2)顺锉法(3)推锉法

9、车削加工时,如果血药更换主轴转速应(1)。

(1)先停车,再变速(2)工件旋转式直接变速(3)点动开关变速

10、在普通车床主要加工(2)。

(1)带凸凹的零件(2)盘、轴、套类零件(3)平面零件

外圆车刀安装时,刀杆伸出适当位置应为(2)。

(1)刀杆总长的2/3 (2)刀杆厚度的倍(3)伸出刀架5mm

(4)任意伸长刀架5mm (5)任意伸长

11、车床通用夹具能自动定心的是(2)。

(1)四爪卡盘(2)三爪卡盘(3)花盘

12、粗车时为了提高生产效率,选用切削用量时,应首先取较大的(1)。

(1)被吃刀量(2)进给量(3)切削速度

三、判断题

1、削铣时铣刀作直线运动,工件作旋转运动。(×)

2、逆铣是逆时针旋转,顺铣是顺时针旋转。(×)

3、铣刀刀齿的不断切入和切出,切削力在不断的变化,易产生冲击和震荡。(√)

4、在外圆磨床上磨削工件,两端应事先打上中心孔。(√)

5、砂轮是有磨粒与结合剂粘合而成的多刃刀具。 (√)

6、选择锉刀尺寸规格的大小,仅仅取决于加工余量的大小。(×)

7、锉刀常分为平锉、方锉、三角锉三种类型。 (×)

8、推锉的方法主要用于加工余量较小的工件和修正尺寸。(√)

9、机床转速加快,刀具走光量不变。(√)

10、切削速度是指机床的转速。(×)

11、为了增加尖刀强度,分别采用45°偏刀和90°偏刀,背吃刀量不变的情况下它的切削宽度相同。(×)

四、简答题:

1、何为镦粗镦粗的方法有哪些

答:使毛坯横断面积增大,高度减小的锻造工序称为镦粗,镦粗的方法有:完全镦粗和局部镦粗。

2、冲压加工的特点是?

答:冲压件尺寸精确,表面平整光洁;冲压件互换性好;材料利用率高;操作简单,生产效率高。

3、简述磨削的工艺特点?

答:加工精度高,表面粗超度值低。磨削材料较广泛。砂轮安装前必须进行平衡试验。

④径向分力大,切削温度高。

4、车刀前角应根据什么原则来选择

答:(1)车削塑性金属时可取较大的前角;车削脆性金属可取较小的前角。工件材料软,可选择较大的前角;工件材料硬,应选较小的前角;(2)粗加工,尤其是车削有硬皮的铸、锻件时,应取较小的前角;精加工时,为减少工件表面粗糙度值,一般应取较大前角;(3)车刀材料的强度、韧性较差,前角应取小些;反之,前角可取得较大

5.车削轴类零件时,由于车刀的哪些原因,而使表面粗糙度达不到要求

6.1)车刀刚性不足或伸出太长引起振动; 2)车刀几何形状不正确,例如选用过小的前角、主偏角和后角; 3)刀具磨损等原因。

7.扳机组成:转子、叶片、气缸、前端盖、前端列向心球轴承、后端盖、后端到向心球

轴承共7大件组成。

8、去较大截面,选垂平分型面、减少分型面数目,让加工基准面和大部分加工面位于同一沙箱。

五、计算题

六、

1、在MQ1350A 型外圆磨床上,砂轮直径为750mm ,砂轮速度为890r/min ,请问砂轮的圆周线速度为多少?

)/(9.3460

*1000890*750*14.360*1000n c s m D V ==**=π解: 答:砂轮的圆周线速度为s 。

2、车削外圆柱面,已知工件转速320r/min ,车刀的纵向移动量为r ,毛坯直径为ф100mm ,走刀一次后直径为ф90mm ,求为多少、p c ?V

3、

()()mm D m D V p C 52901002d min /48.1001000320*100*14.31000n **=-=-=?==

π解: 。为,背吃刀面为答:切削速度mm 5min /r 45.10p c ?V

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