Heidenhain iTNC 530 (340 420) Manuel d'utilisateur télécharger pdf (Page 295)

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HEIDENHAIN iTNC 530 267

8.4 Cycles for Milling Pockets, Studs and Slots

POCKET MILLING (Cycle 4)

1 The tool penetrates the workpiece at the starting position (pocket

center) and advances to the first plunging depth.

2 The cutter begins milling in the positive axis direction of the longer

side (on square pockets, always starting in the positive Y direction)

and then roughs out the pocket from the inside out.

3 This process (1 to 2) is repeated until the depth is reached.

4 At the end of the cycle, the TNC retracts the tool to the starting

position.

U Set-up clearance 1 (incremental value): Distance

between tool tip (at starting position) and workpiece

surface

U Depth 2 (incremental value): Distance between

workpiece surface and bottom of pocket

U Plunging depth 3 (incremental value): Infeed per cut

The TNC will go to depth in one movement if:

n the plunging depth is equal to the depth

n the plunging depth is greater than the depth

U Feed rate for plunging: Traversing speed of the tool

during penetration

U First side length 4 (incremental value): Pocket

length, parallel to the reference axis of the working

plane

U 2nd side length 5: Pocket width

U Feed rate F: Traversing speed of the tool in the

working plane

U Clockwise

DR +: Climb milling with M3

DR –: Up-cut milling with M3

Example: NC blocks

11 L Z+100 R0 FMAX

12 CYCL DEF 4.0 POCKET MILLING

13 CYCL DEF 2.1 SETUP 2

14 CYCL DEF 4.2 DEPTH -10

15 CYCL DEF 4.3 PECKG 4 F80

16 CYCL DEF 4.4 X80

17 CYCL DEF 4.5 Y40

18 CYCL DEF 4.6 F100 DR+ RADIUS 10

19 L X+60 Y+35 FMAX M3

20 L Z+2 FMAX M99

Before programming, note the following:

This cycle requires a center-cut end mill (ISO 1641), or pilot

drilling at the pocket center.

Pre-position over the pocket center with radius

compensation R0.

Program a positioning block for the starting point in the

tool axis (set-up clearance above the workpiece surface).

The algebraic sign for the cycle parameter DEPTH

determines the working direction. If you program DEPTH

= 0, the cycle will not be executed.

The following prerequisite applies for the 2nd side length:

2nd side length greater than [(2 x rounding radius) +

stepover factor k].

1 2 ... 290 291 292 293 294 295 296 297 298 299 300 ... 529 530

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Heidenhain iTNC 530 (340 420) Manuel d'utilisateur Page 295

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