工序Ⅺ 磨削Ф90外圆以及零件右端Ф45外圆 1. 选择砂轮：WA46KV6P350x40x12

2. 切削用量的选择。砂轮转速n砂=1500 r/min，v砂=27.5m/s

轴向进给量fa=0.5B=20mm 工件速度Vw=10m/min

径向进给量fr=0.015mm/（双行程） 3. 切削工时。 （1） 加工Ф90外圆 （2） 加工Ф45外圆

t11?2LbzbK1000vffaarr=0.819min

t?2LbzbK1000vff=1.606min

工序Ⅻ 抛光B面

工序ⅩⅢ 刻线、刻字 工序XIV 镀铬 工序XV 检测入库

夹具的设计

（一） 问题的提出

本夹具用来钻Ф4的孔，有一定的公差要求，但同时应考虑提高生产率；因此设计时，对本夹具有一定的形位要求，还应装夹方便。本夹具使用在Z525型摇臂钻床上，选用偏心轮夹紧。 （二） 夹具设计

1、 定位基准的选择

由零件图可知孔Ф4对于Ф90右端面有公差要求，经过尺寸链计算，选用Ф100左端面作为基准；采用偏心轮夹紧便于装卸。 2、 切削力及夹紧力计算

1）切削力的计算：

轴向力：F?9.81其中：

cdf.kF0zF.yFF(N)

cF?42.7

d0?4 f?0.22

kF ?0.9（新的钻头）

zF?1.0

yF?0.8

则：F?449.382N 扭矩: M?9.81其中：

zM.yM. .cMd0fkmcM?0.021

zM?2.0

yM?0.8

kM ?0.87则：M?0.884N*m

2）夹紧力的计算：

由《机床夹具设计手册》表1-2-20，查得：当D=32，d=8，e=1.7，Ⅲ型，得夹紧力为

W0=3680（N）

3）切削力与夹紧力比较

由夹具结构知，轴向力与夹紧力垂直，欲使夹具安全工作，夹紧力产生的摩擦力必须大于轴向力。一般钢铁接触面的摩擦系数为：0.1～0.15。此处取小值0.1。

则F总=2f=2×368=736>449.238 所以安全。

由于钻头直径为Ф4，所以产生的扭矩非常小，夹具可安全工作。 3、 夹具图（见附图）

4、 夹具中的V形块用于对心，使用了快换钻套，便于铰Ф6孔。 参考文献 1、《机械制造工艺学》。顾崇等编1994年6月。 陕西科学技术出版社 2、《机械精度设计与检测》张帆主编2006年5月。陕西科学技术出版社。 3、《机械制造工艺设计简明手册》。李益民主编1999年10月 机械工业出版社 4、《切削用量简明手册》。艾兴等编2000年3月 机械工业出版社 5、《机床夹具设计手册》。徐鸿本主编2003年10月 辽宁科学技术出版社 6、《金属机械加工工艺人员手册》。上海科技出版社 7、《机床夹具设计手册》。杨黎明主编，国防工业出版社 g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: you don't agree with the disciplinary action your employer has taken against you your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven't appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any compensation awarded to you as a result of your failure to appeal. 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