If you want to do a good job, you must first refine the tool. Often affect the lifespan of the tool and the processing efficiency, in particular the Tour CNC because machining is the relationship between rotation and centrifugal force of the room, the speed of rotation will be limited by size and the room tightening method. The only way to improve efficiency is to increase the supply rate or increase the cutting depth. Machine VTRN-36 Machine as an example to calculate if the engine supply can meet the cutting requirements.
Since the Vurn-36 must be driven by the transmission, the torque will change, so the calculation is integrated to obtain the correct cutting force.
Vurn-36 is divided in 2000 rpm and 2500 rpm. The report is 1: 6.54, the high -end speed ratio is 1: 2.15, when you understand the part, the cutting speed must be converted to the engine engine speed to obtain the power of Correct cut.
(I) Cutting power calculation formula:
No (kw) ＝ (Ap × F × VC × Pcs) ÷ (60 × 10³ × η)
AP (mm): Cutting depth / F (mm / Rev): supply by revolution / VC (m / min): cutting speed / ks (n / mm²): specific cutting force (see table) / η: efficiency Total machine tool (80% or 90%) / ne (kW): Power required
Example: process steel with low carbon content with an external diameter of 200 mm, a single cut depth of 3 mm, a cutting speed of 120 m / min and a power flow of 0.2 mm / review To find the required power.
Answer: NE = (3 × 0.2 × 120 × 2600) ÷ (60 × 1000 × 0.8) = 3.9 kW
(Ii) Calculation of the cutting torque:
Since the VTurn-36 has a low-speed gear ratio of 1: 2.4 by the transmission, the engine torque can be increased by 2.4 times.
The equipment ratio of the high -speed gear is 1: 0.79, so the engine torque is reduced to 0.79 times.
T (NM) = AP × KS × F × R / AP (mm): cutting depth / ks (n / mm²): specific cutting force (see table) / f (mm / ren): Revolution / t power / t power (NM): Couple of cutting / r (m): cutting room radius
Example: Steel treatment with low carbon content with an outer diameter of 200 mm, a single cutting depth of 3 mm, a cutting speed of 120 m / min and a power flow of 0.2 mm / Rev to find the required couple.
Answer: T = 3 × 2600 × 0.2 × 0.1 = 156 (nm)
(III) Calculation of cutting speed:
N = (VC × 1000) / (D × 3.14) / N (rpm): pin speed / vc (m / min): cutting speed / d (mm): diameter of the part
From the example above, the speed of the part n = (120 × 1000) ÷ (200 × 3.14) = 191rpm
Consequently, the conditions necessary to treat this part are: (1) Power = 3.9 kw (2) Couple = 156n-m (3) Speed = 191rpm
(Iv) check if the pin engine has sufficient cutting force to treat this part:
The VTRN -36 Dual -Segment 2000rpm / α22i engine is used as an examination model.
1. Green at low speed: because the spindle and engine ratio is 1: 8.08, the engine speed at 191 rpm is 1543 rpm (the power is 26 kW). The gearbox speed ratio is 1: 2.4, so the spindle torque can be increased by 2.4 times.
2. The gearbox speed ratio is 1: 0.79, so the spindle torque is reduced to 0.79 times. Due to the actual cut of the outside diameter, the impact of the couple is very small and can be ignored!
Consequently, it is necessary to fulfill the conditions of treatment of article (IV) 1. Power: 3.9 kW the load of the pin with a processing of low -speed files is approximately 15%, and the load Pin with high -speed gear treatment is around 48%.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
