HEIDENHAIN iTNC 530 (60642x-04) Cycle programming - Manual (Page 208)

208 Fixed Cycles: Contour Pocket, Contour Trains
7.
1
1
TR
OCHOID
AL SL
O
T
(Cy
c
le 275, DIN/ISO:
G275)
7.11 TROCHOIDAL SLOT (Cycle 275,
DIN/ISO: G275)
Cycle run
In conjunction with Cycle 14 CONTOUR GEOMETRY, this cycle facilitates
the complete machining of open slots or contour slots using
trochoidal milling.
With trochoidal milling, large cutting depths and high cutting speeds
are possible because the equally distributed cutting conditions prevent
wear-increasing influences on the tool. When tool inserts are used the
entire cutting length is exploited to increase the attainable chip volume
per tooth. Moreover, trochoidal milling is easy on the machine
mechanics. Enormous amounts of time can also be saved by
combining this milling method with the integrated adaptive feed
control AFC software option (see User's Manual on conversational
programming).
Depending on the cycle parameters you select, the following
machining alternatives are available:
 Complete machining: Roughing, side finishing
 Only roughing
 Only side finishing
Roughing
The contour description of an open slot must always start with an
approach block (APPR).
1 Following the positioning logic, the tool moves to the starting point
of the machining operation as defined by the parameters in the
APPR
block, and positions there perpendicular to the first plunging
depth.
2 The TNC roughs the slot in circular motions to the contour end
point. During the circular motion the TNC moves the tool in
machining direction by an infeed you can define (Q436). Define
climb or up-cut of the circular motion in parameter Q351.
3 At the contour end point, the TNC moves the tool to clearance
height and returns to the starting point of the contour description.
4 This process is repeated until the programmed slot depth is
reached.
Finishing
5 Inasmuch as a finishing allowance is defined, the TNC finishes the
slot walls, in multiple infeeds if so specified. Starting from the
defined starting point of the APPR block, the TNC approaches the
slot wall. Climb or up-cut are taken into consideration.
Beispiel: TROCHOIDAL SLOT scheme
0 BEGIN PGM CYC275 MM
...
12 CYCL DEF 14.0 CONTOUR GEOMETRY
13 CYCL DEF 14.1 CONTOUR LABEL 10
14 CYCL DEF 275 TROCHOIDAL SLOT ...
15 CYCL CALL M3
...
50 L Z+250 R0 FMAX M2
51 LBL 10
...
55 LBL 0
...
99 END PGM CYC275 MM