Siemens SINUMERIK 828D Turning, Руководство по эксплуатации функций

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W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1461
Supplementary conditions
The approach and retraction blocks are polynomials in the following two variants. Therefore, they are only
available for control variants, which support polynomial interpolation.
• KONTT
With
KONTT
, approach and retraction to/from the contour is with a constant tangent. The curvature at the
block transition is not usually constant.
• KONTC
With
KONTC
, not only the tangent but also the curvature is constant at the transition, with the result that a jump
in acceleration can no longer occur on activation/deactivation.
Although
KONTC
includes the
KONTT
property, the constant tangent version
KONTT
is available on its own,
because the constant curvature required by
KONTC
can produce undesired contours.
Axes
The continuity condition is observed in all three axes. It is thus possible to program a simultaneous path
component perpendicular to the compensation plane for approach/retraction.
Only linear blocks are permitted for the original approach and retraction blocks with
KONTT
/
KONTC
. These
programmed linear blocks are replaced in the control by the corresponding polynomial curves.
Exception
KONTT
and
KONTC
are not available in 3D variants of tool radius compensation
(CUT3DC, CUT3DCC,
CUT3DF)
.
If they are programmed, the control switches internally to
NORM
without an error message.
Example for KONTC
The two figures below show a typical application for approach and retraction with constant curvature:
The full circle is approached beginning at the circle center point. The direction and curvature radius of the
approach circle at the block end point are identical to the values of the next circle. Infeed takes place in the Z
direction in both approach/retraction blocks simultaneously.
The associated NC program segment is as follows:
$TC_DP1[1,1]=121 ; Milling tool
$TC_DP6 [1,1]=10 ; Radius 10 mm
N10 G1 X0 Y0 Z60 G64 T1 D1 F10000
N20 G41 KONTC X70 Y0 Z0
N30 G2 I-70 ; Full circle
N40 G40 G1 X0 Y0 Z60
N50 M30