车削时,刀尖半径与进给量、表面粗糙度的理论值存在一定关系,我们选择进给量时一般不应超过此值。
h=re-(re²-(0.5×f)²)0.5
h为残留高度,而:
Ra=(0.25~0.33)h
因此:
fmax=(Ra×re/50)½
刀尖圆角 mm | 圆刀片 mm
| Ra/Rz µm |
| 0.4/1.6 | 1.6/6.3 | 3.2/12.5 | 6.3/25 | 8/32 | 32/100 |
| 进给量 mm |
| 0.2 | | 0.05 | 0.08 | 0.13 | | | |
| 0.4 | | 0.07 | 0.11 | 0.17 | 0.22 | | |
| 0.8 | | 0.10 | 0.15 | 0.24 | 0.30 | 0.38 | |
| 1.2 | | | 0.19 | 0.29 | 0.37 | 0.47 | |
| 1.6 | | | | 0.34 | 0.43 | 0.54 | 1.08 |
| 2.4 | | | | 0.42 | 0.53 | 0.66 | 1.32 |
| | 6 | 0.20 | 0.31 | 0.49 | 0.62 | | |
| | 8 | 0.30 | 0.36 | 0.56 | 0.72 | | |
| | 10 | 0.25 | 0.40 | 0.63 | 0.80 | 1.00 | |
| | 12 | | 0.44 | 0.69 | 0.88 | 1.10 | |
| | 16 | | 0.51 | 0.80 | 1.01 | 1.26 | 2.54 |
| | 20 | | | 0.89 | 1.13 | 1.42 | 2.94 |
| | 25 | | | | 1.26 | 1.58 | 3.33 |