Siemens SINUMERIK 828D Turning, Руководство по эксплуатации функций

Страница: 1480 / 1799

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
Basic Functions
1480
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
G450 (transition circle)
With the G function
G450
active, on outside corners, the center point of the tool travels a circular path along the
tool radius. The circular path starts with the normal position (perpendicular to the path tangent) at the end point of
the previous path section (program block) and ends in normal position at the start point of the new path section
(program block).
Where outside corners are very flat, the response with
G450
(transition circle) and
G451
(intersection) becomes
increasingly similar → refer to very flat outside corners.
If pointed outside corners are desired, the tool must be retracted from the contour ( → see "DISC").
DISC
The
G450
transition circle does not produce sharp outside contour corners because the path of the tool center
point through the transition circle is controlled so that the cutting edge stops at the outside corner (programmed
position). When sharp outside corners are to be machined with
G450
, the
DISC
instruction can be used to
program an overshoot. Thus, the transition circle becomes a conic and the tool cutting edge retracts from the
outside corner.
The range of values of the
DISC
instruction is 0 to 100, in increments of 1.
The programmable maximum value for
DISC
can be set via the machine data:
MD20220 $MC_CUTCOM_MAX_DISC (max. value for DISC).
Values greater than 50 are generally not advisable with
DISC
.
Figure 18-24 Example: Overshoot with DISC= 25
Value Significance
DISC = 0
Overshoot disabled, transition circle active
DISC = 100
Overshoot large enough to theoretically produce a response similar to
intersection (
G451
).
&RQLFVHFWLRQ
&LUFOH
&RQWRXUDQJOH
',6&
',6&
',6&