CA6140车床后托架的设计(7)

制定CA6140车床后托架的加工工艺、设计

f=0.48min/r v=26m/min

ns=1000v/Πdw=331r/min

切削工时 L1=12.5*0.7+1.5=10min L2=3mm, L=60min

Tj=L/fn=0.46min

工序Ⅳ

1.铰孔Φ25.5

f=0.7mm/r

v=14mm/min

ns =1000v/Πd=174.8mm 切削工时

L=40mm

L=45. L2=3

Tj=L+L1+L2/fn=0.72min 锪端面

根据有关规定，锪沉头孔时进计量吉切削速度、约为钻孔时的1/2-1/3，故 f =1/3钻=1/3*0.6=0.2mm/r

v=1/3v钻=1000*8.33/ΠD =8.33 切削工时

L1=20.L2=0.L=2

2.钻孔

F=0.17min/r V=28m/rin

Ns=1486.2r/min

切削工时

L=41mm T2=3mm T=l+L1+L3

3.钻孔M6D底孔Φ49.18。

f=0.15min/r v=28mm/min

ns=1000v=1813.5r/min 切削工时

T=3.72mm

T2=3.72mm T3=3mm

T=l+l2+l3=0.32 4.攻螺纹M6mm

切削用量选取 v=0.1/s=6m/min