Time:2021-10-19 Views:262
1. Trigonometric function calculation
1.tanθ=b/a θ=tan-1b/a
2.Sinθ=b/c Cos=a/c
2. Calculation of cutting speed for cavity machining
Vc=(π*D*S)/1000
Vc: linear velocity (m/min) π: circumference ratio (3.14159) D: tool diameter (mm)
S: Speed (rpm)
Example. Use Φ25 milling cutter Vc to be (m/min)25 to find S=?rpm
Vc=πds/1000
25=π*25*S/1000
S=1000*25/ π*25
S=320rpm
Three, the calculation of the cavity processing feed (F value)
F=S*Z*Fz
F: Feed rate (mm/min) S: Rotation speed (rpm) Z: Number of blades
Fz: (actual feed per edge)
Example. A standard 2-flute end mill cuts a workpiece at a speed of 2000rpm), and find the feed (F
Value)? (Fz=0.25mm)
F=S*Z*Fz
F=2000*2*0.25
F=1000(mm/min)
Fourth, the calculation of the residual material height
Scallop=(ae*ae)/8R
Scallop: residual material height (mm) ae: XYpitch (mm) R tool radius (mm)
Example. Φ20R10 refined 2 blades, the pre-residual height is 0.002mm, what is the pitch?
few? mm
Scallop=ae2/8R
0.002=ae2/8*10
ae=0.4mm
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