制定CA6140车床后托架的加工工艺、设计

3.扩孔Φ39.6mm

f=0.1-1.0mm/r,取f=0.8mm/r v=15-12m/min,取v =14mm nsc=10000/Πdw=1126r/min 切削工时 t=60mm

t1=5.5min

t2=4mm

Tj=L/fn=0.78min 4.铰孔Φ40:

f=1.0-1.2,取f=1.1mm/r v=14m/min

ns=10000/ΠD=111.5r/min

切削工时 t=60

根据Ap=D-d1/2=0.2mm 可选t1=28mm t2=2-4,L1=3

Tj=l+L1+L2/fn=0.75min 工序Ⅲ

Φ30.2孔 1. 钻孔Φ25mm f=0.48mm/r v=26m/min

ns=1000v/Πdw=330r/min

切削工时

L1=25/2*0.7+1.5=10.2mm 2. 二次钻孔Φ30mm

f=1.35f钻=0.77mm/r v=0.4v钻=96m /mpn

ns =1000v/Πd=280.1r/min

切削工时 l=60mm,L1=30-25/2*0.7+1.5=3.25 T1=3

Tj=L+L1+L2/0.77*280.7=0.31min 3.铰孔Φ30.2

f=11min/r v=14m/min

ns=1000v/Πd=147.6r/min 切削工时L=60

因为ap=D-d1/2=0.1mm L1=13-15取LQ=14 mm L2=3mm

Tj=60+14+3/1.1*147.6=0.48min 4.钻孔

钻孔Φ25min