Общий каталог Mitsubishi 2020 - 2021 - страница 1739

FORMULAS FOR FACE MILLING

y CUTTING SPEED (vc)

(Problem) What is the cutting speed when main axis spindle speed is 350 min -1 and cutter diameter is &5" ? (Answer) Substitute ) 3.14, DC=5", n=350 into the formula. vc =) • DC• n = 3.14×5"×350 = 457.9 SFM

12 12 The answer is 457.9 SFM. DC

y FEED PER TOOTH (fz)

z • n n (min-1) : Main Axis Spindle Speed (Feed per Revolution fr=z×fz) (Problem) What is the feed per tooth when the main axis spindle speed is 500 min-1, insert number is 10, and table feed is 20 IPM ?

(Answer) Substitute the above figures into the formula. Feed

Direction Vf 20

fz = = = .004 IPT

z×n 10×500 The answer is .004 IPT. Wiper Edge Angle Tooth Mark

Feed per Tooth

y TABLE FEED (vf)

n (min-1) : Main Axis Spindle Speed (Problem) What is the table feed when feed per tooth is .004 IPT, with 10 inserts and main axis spindle speed is 500 min-1? (Answer) Substitute the above figures into the formula.

vf = fz×z×n = .004 IPT×10×500 = 20 IPM The answer is 20 IPM.

y CUTTING TIME (Tc)

Tc (min) : Cutting Time

Tc = L (min) vf (IPM) : Table Feed per Min.

vf L (inch) : Total Table Feed Length (Work material Length(l)+Cutter Diameter(DC)) (Problem) What is the cutting time required for finishing 4" width and 12" length surface of a cast iron (AISI No 30 B) block when cutter diameter is

&8", the number of inserts is 16, the cutting speed is 410 SFM, and feed per tooth is .01". (spindle speed is 200 min-1) DC (Answer) Calculate table feed per min vf=.01×16 ×200=32 IPM P I Calculate total table feed length. L=12+8=20 inch L Substitute the above answers into the formula. Tc = 20 32 = 0.625 (min) 0.625 × 60 = 37.5 (sec.) The answer is 37.5 sec.