Drilling calculation formula
- 1. Processing time Tc [sec]
- Tc
- =
- 60 x H x π x DC x i
- f x vc x 1,000
- =
- 60 x H x i
- vf
- 2. Required power Pc [kW]
- Pc
- =
- HB x DC0.68 x vc1.27 xf0.59
- 36,000
- 3. Cutting speed vc [m/min]
- vc
- =
- π x DC x n
- 1,000
- 4. Spindle speed n [min-1]
- n
- =
- vc x 1,000
- π x DC
- 5. Feed per revolution f [mm/rev]
- f
- =
- vf x π x DC
- vc x 1,000
- =
- vf
- n
- 6. Feed rate vf [mm/min]
- vf
- =
- f x vc x 1,000
- π x DC
- =
- n x f
- 7. Axial force F [N]
- F = 0.24 x HB x DC0.95 x f 0.61 x 9.8
- 8. Torque Mc [N･m]
- Mc
- =
- Pc x 30 x DC
- vc
- =
- Pc x 30 x 103
- π x n
- 9. Chip discharge Q [cm3/min]
- Q
- =
- π2 x DC3
- vc x f x 106
- =
- π x DC2
- n x f x 1,000
Brinell hardness of cut material HB Approximate value
- P
- Non-alloy steel150 HB
- Low-alloy steel200 HB
- High alloy steel300 HB
- M
- Ferritic system150 HB
- Austenite system200 HB
- K
- Malleable cast iron180 HB
- Gray cast iron220 HB
- Nodular cast iron300 HB
- N
- Aluminum alloy100 HB
- Copper alloy250 HB
- S
- Fe base200 HB
- Ni base220 HB
- Co base300 HB
- Ti base350 HB
- H
- High hardness steel 50-55HRC500 HB
- High hardness steel 60-63HRC700 HB
- Tc
- Processing time[sec]
- Pc
- Required power[kW]
- vc
- Cutting speed[m/min]
- n
- Spindle speed[min-1]
- f
- Feed per revolution[mm/rev]
- vf
- Feed rate[mm/min]
- F
- Axial force[N]
- Mc
- Torque[N·m]
- Q
- Chip discharge[cm3/min]
- DC
- The blade diameter of the drill[mm]
- H
- Drilling depth[mm]
- i
- Number of holes[pcs]
- HB
- Brinell hardness of cut material[HB]
- ※ π ≒ 3.14
Consulting
