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4 er osion cy cles, Practice examples: eroding with cycle 17 disk – HEIDENHAIN TNC 406 User Manual

Page 174

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HEIDENHAIN TNC 406, TNC 416

153

8.4 Er

osion Cy

cles

Cycle 17 DISK in the part program, example 1

Practice examples: Eroding with Cycle 17 DISK

Workpiece geometry

Cavity diameter D = 24 mm
Eroding depth T = –10 mm

Electrode data

Cylindrical electrode
Electrode radius Re = 9.9 mm
Electrode undersize U = 4.2 mm
Width of the erosion gap B= 0.1 mm

Calculation of the expansion radius

Expansion radius for Cycle 17 DISK
RAD = (0.5 • 4.2 mm) – 0.1 mm = 2 mm

Example 1, top illustration:

Pre-position over the workpiece surface, circular
expansion.

Example 2, bottom illustration:

Erode to –10 mm depth, circular expansion
without pecking.

Y

X

Z

24 mm

Y

X

Z

24 mm

0 BEGIN PGM EXDISK1 MM

1 BLK FORM 0.1 Z X+0 Y+0 Z–20

2 BLK FORM 0.2 X+100 Y+100 Z+0

3 CYCL DEF 1.0 GENERATOR

Cycle GENERATOR (see ”Cycle 1 GENERATOR” on page 133)

4 CYCL DEF 1.1 P-TAB CUST1

Desired erosion table

5 CYCL DEF 1.2 MAX=8 MIN=8

Select power stage

6 TOOL DEF 1 L+0 R+9.9

Electrode length, electrode radius

7 TOOL CALL 1 Z U+4.2

Undersize

8 L X+50 Y+50 Z+1 R0 F MAX

Pre-positioning

9 CYCL DEF 17.0 DISK

Cycle 17 DISK (see ”Cycle 17 DISK” on page 142)

10 CYCL DEF 17.1 Z–10 R F M36

Eroding depth Z = –10 mm, eroding ON

11 CYCL DEF 17.2 RAD=2 MOD=0

Expansion radius RAD = 2 mm, circular expansion

13 L Z+100 R F MAX M37

Retract to set-up clearance, eroding OFF

14 END PGM EXDISK1 MM

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