Lathe cutting powermeter calculates

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Labour desire be apt to its thing needs first benefit its implement, force and cutting force are bumped in what workpiece can bear besides cutting tool itself in treatment outside, the power of body of machine a playscript with stage directions and steel sex are enough, often affect cutting tool life and treatment efficiency, especially because CNC lathe treatment is workpiece rotates to concern with centrifugal force, rotate speed can hold means to be restricted certainly because of workpiece size and clip, want efficiency to promotion raises cutting feed to lead only or increase cutting depth when treatment, and right now if power of machine stage main shaft is insufficient, often can bring about machine stage because of this to stop machine or cutting tool damaged, the following with respect to Taichun essence machine Vturn-36 machine stage serves as example, whether can computational motor power accord with cutting demand. Because Vturn-36 must pass gear-box drive, torsional meeting is changed somewhat, so compositive computation in an attempt to gets correct cutting power. Vturn-36 cent is 2000 turn reach 2500 turn, 2000 turn cheap when main shaft and motor rotate speed are compared for 1 ∶ 8.

08, high-grade for 1 ∶ 2.

66. 2500 turn cheap rotate speed is compared for 1 ∶ 6.

54, high-grade for 1 ∶ 2.

15, when knowing workpiece cutting rate beard conversion becomes rotate speed of main shaft motor, ability gets true cutting power. (One) cutting powermeter calculates formula: Ne(Kw) ＝ (÷ of Ks) of × of Vc of × of Ap × F (η of 60 × 10³ × ) deepness of Ap(mm) ∶ cutting / F(mm/rev) ∶ every turn feed / speed of Vc(m/min) ∶ cutting / Ks(N/mm²) ∶ compares cutting force (check a watch) / η ∶ machine tool overall efficiency (80% or 90%)/Ne(Kw) ∶ : Process mild steel of external diameter 200mm, unilateral cuts deep 3mm, cutting speed 120m/min, feed is led 0.

2mm/rev begs place to need power. Solve: Ne ＝ (3 × 0.

120 × of 2 × 2600) ÷ (1000 × of 60 × 0.

8) ＝ 3.

9Kw(2) cutting is torsional computation: Because Vturn-36 has low gear of course gear-box drive,gear comparing is 1 ∶ 2.

4, motor is so torsional can promote 2.

4 times. High gear gear is compared for 1 ∶ 0.

79, motor is so torsional fall for 0.

79 times. × of F of × of Ks of × of T(N-m) ＝ Ap R/Ap(mm) : Cutting deepness / Ks(N/mm²) : Than cutting force (check a watch) / F(mm/rev) ∶ every turn feed / torque of impedance of T(N-m) ∶ cutting / example of radius of workpiece of R(m) ∶ cutting: Process mild steel of external diameter 200mm, unilateral cuts deep 3mm, cutting speed 120m/min, feed is led 0.

2mm/rev begs place to need torque. Solve: 3 × of T ＝ 2600 × 0.

2 × 0.

1 ＝ 156(N-m)(3) computation of cutting rotate speed: N=(Vc × 1000)/(D × 3.

Rotate speed of main shaft of ∶ of 14) / N(rpm) / speed of Vc(m/min) ∶ cutting / diameter of D(mm) ∶ workpiece by above ＝ of N of rotate speed of workpiece of example cipher out (÷ of 120 × 1000) (200 × 3.

14) ＝ 191rpm should machine this work place to need a condition to be so: (1) power ＝ 3.

191rpm(of ＝ of rotate speed of 156N-m (3) of ＝ of 9Kw (2) torque 4) examine main shaft motor to whether enough cutting force processes this work: With Vturn -36 double paragraph of 2000rpm/ α 22i is motor to examine machine kind. 1.

Low gear: Because main shaft and motor rotate speed are compared,be 1 ∶ 8.

08 so motor rotate speed is 26KW) for 1543rpm(power when 191rpm of main shaft rotate speed. Gear-box gear compares for 1: 2.

4 main shaft is so torsional can promote 2.

4 times, by motor torque the graph is checked so that its standard is 165N-m about, through 396 N-m can be being amounted to after gear-box. 2.

High gear: Because main shaft and motor rotate speed are compared,be 1 ∶ 2.

66 so rotate speed of the motor when 191rpm of main shaft rotate speed is 8KW) about for 508rpm(power. Gear-box gear is compared for 1 ∶ 0.

79 main shaft is so torsional fall for 0.

79 times, by motor torque the graph is checked so that its standard is 165N-m about, through there is 123 N-m only after gear-box. Because of cutting of actual measurement external diameter, torque impact is very little, but oversight! Because this should be accorded with (4) machine a condition 1.

Power: 3.

9Kw is made an appointment with with load of main shaft of low gear treatment for 15% , with high gear treatment is about 48% . CNC Milling