1. Trigonometric function calculation

1.tanθ=b/a θ=tan-1b/a

2.Sinθ=b/c Cos=a/c

 

2. Calculation of cutting speed

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 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

less? mm

Scallop=ae2/8R

0.002=ae2/8*10

ae=0.4mm

5. Calculation of escape hole

Φ=√2R2 X, Y=D/4

Φ: diameter of escape hole (mm) R tool radius (mm) D: tool diameter (mm)

Example. It is known that a mold cavity needs to be processed with an escape angle (as shown in the figure),

The milling cutter used is ψ10; may the escape angle hole be the smallest

For what? What is the center of the circle?

Φ=√ 2R2

Φ=√2＊52

Φ=7.1(mm)

X, Y = D/4

X, Y = 10/4

X, Y = 2.5 mm

The coordinates of the center of the circle are (2.5, -2.5)

 

6. Calculation of reclaiming amount

Q=(ae*ap*F)/1000

Ｑ: Reclaiming amount (cm3/min) ae: XYpitch(mm) ap: Zpitch(mm)

Example. Knowing that a mold must be processed with the same height as the cavity, the XYpitch of the Φ35R5 knife is 60% of the tool, and each layer cuts 1.5mm, and the feed rate is 2000mm/min. What is the amount of material taken for this tool?

Q=(ae*ap*F)/1000

Ｑ＝35*0.6*1.5*2000/1000

Ｑ＝63 cm3/min

 

Seven, calculation of feed per edge

Fz=hm * √(D/ap)

Fz: Implementation of the feed per blade hm: Theoretical feed per blade ap: Zpitch(mm)

D: Blade diameter (mm)

Example (provided that the depo XYpitch is 60% of the tool)

For the depoΦ35R5 knife, the cutting hm of NAK80 material is 0.15mm, and the cutting depth of Z axis is 1.5mm.

Fz=hm * √(D/ap)

Fz＝0.2*√10/1.5

Fz=0.5mm