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HORN Technology Days 2015

Trochoidal hard milling

with coated

solid carbide milling cutters

Speaker: Andreas Jenter

Tool life

Trochoidal hard milling

Machining time

Structure

Explanation

Comparison of conventional and trochoidal milling

Trochoidal hard milling

Cutting data

Approach strategy

Application examples

Summary

Explanation

Trochoidal milling

Circular paths superimposed

Trochoidal/Conventional milling Groove milling by circular

interpolation

Full groove milling

Constant fz

Variable average chip thickness

Trochoidal milling

CAM

Constant hm

Variable feed rate

CNC

Area of application

Cutting data

vc

fz

ae

ap

Stability

Kinematics

Contour

Target

Cutting data

ae max

N ae 33% ~70°

P ae 23% ~57°

M ae 18% ~50°

K ae 20% ~53°

H ae 8% ~33°

vc - fz - ap

vc + 0% - + 80%

fz + 0% - + 100%

ap 1 x •Ø - 3 x Ø

Trochoidal hard milling

Material 42CrMo4 55 HRc Milling cutter Ø 6, Z 4, R 0.5

Type DSTH…TS3E

Machine DMU 85FD

vc 180 m/min (nmax spindle)

fZ 0.06 mm

ae 12% / Ø (40°)

ap 5.5 mm

Trochoidal hard milling

1.2343

57 HRc

120 x 120 x 25 mm

Ø 10, Z 4

DSTH…TS3E

Approach strategy

From outside

Start bore

Helix or ramp, adjust cutting data

5-axis, utility program

Trochoidal/Level roughing

Level roughing

vc 150 m/min

fZ 0.08 mm

ae 70%

ap 1 mm

Trochoidal roughing

vc 168 m/min

fZ 0.12 mm

ae 6% / 10°

ap 15 mm

Constant average chip thickness

Low torque

Low thermal load

Efficient tool use

Longer tool life

Take note of the plunge strategy

Summary

Tool life

Trochoidal hard milling

Machining time