Rough-Out (Cycle 6) - HEIDENHAIN TNC 370 User Manual

8 Cycles
8.5 SL Cycles
ROUGH-OUT (Cycle 6)
Mow
* Ragram a pas&ioning black
far the
starting
point in the toot axis fsetup clearance above the Yvorkpiecs
surface).
,,
l
Yhe algebraic sign for cycle parameter DEPTH defines the w&&g dire?iction.
l
This cycts txquires a centler-cut end mifl @3Q VW 1, or pikt drilfing v&h Cycls 15.
l
Machine parameter 7420 Fsea page 12-Q) dstsrmines whether
- the contour is first milked @nd rhen surface machineded, ar vice-versa
- the cantour is mifled ccknventionally or by ctirirb milfing
- all
pmkefets
are first rou@%d out ta the full m#ing depths and then
conttau~ miltad,
c?r vice-versa
- contour miffing
and
roughing out are performed U%y$r+her for each pecking
depth.
Process
Cycle 6 specifies the cutting path and partitioning.
l
The tool is positioned in the working plane above the first infeed point,
taking the finishing allowance into account.
l
Then the tool penetrates into the workpiece at the programmed feed
rate for pecking.
Milling the contour:
l
The tool mills the first subcontour at the specified feed rate, taking the
finishing allowance into account.
l
When the tool returns to the infeed point, it is advanced to the next
pecking depth.
l
This process is repeated until the programmed milling depth is
reached.
l
Further contours are milled in the same manner.
Roughing out pockets:
l
After milling the contour the pocket is roughed out. The stepover is
defined by the tool radius. Islands are jumped over.
l
If necessary, pockets can be cleared out with several downfeeds.
l
At the end of the cycle the tool returns to the setup clearance.
Input data
l
SET-UP CLEARANCE @ (incremental value):
Distance between tool tip (starting position) and workpiece surface.
l
MILLING DEPTH @: (incremental value):
Distance between workpiece surface and bottom of hole.
l
PECKING DEPTH 0: (incremental value):
lnfeed per cut. The TNC moves in one operation to theDEPTH if:
- PECKING DEPTH and DEPTH are identical
-
the PECKING DEPTH is greater than the DEPTH.
Enter a positive value.
l
FEED RATE FOR PECKING:
Traversing speed of the tool during penetration.
l
FINISHING ALLOWANCE 0:
Allowance in the working plane. Enter a positive value.
. DIRECTION ANGLE FOR ROUGH-OUT @:
Feed direction for roughing out. The direction angle for rough-out is
referenced to the main axis of the working plane. Enter the angle
such that the resulting cuts are as long as possible.
. FEEDRATEF:
Traversing speed of the tool when milling.
Fig. 8.40: Tool path for rough-out
Fig. 8.41: lnfeeds and distances for the
ROUGH-OUT cycle
8-42
TNC 370 -