Mazak STX SC L PLUS CONTROL Training Manual page 57

MILD STEEL CONTINUED
SYMPTOM: SELF BURNING
DEFINITION OF "SELF BURNING":
ARE THE CUTTING PARAMETERS
SET TO A PROVEN SPECIFICATION
EITHER USED IN THE PAST OR
TAKEN FROM MAZAK CUTTING
DATA CHARTS?
YES
IS THE SET UP CORRECT?
- FOCUS
- NOZZLE GAP
- NOZZLE ORIFICE SIZE
- ASSIST GAS TYPE
YES
IS THE NOZZLE ORIFICE
DAMAGED, BLOCKED BY
SPLATTER OR BEAM
CENTERING OFF?
NO
IS THE DESIRED ASSIST
GAS PRESSURE ACTUALLY
OUTPUT? CHECK THE
DIGITAL OR ANALOG GAUGE
AT THE TORCH.
YES
IS THE FOCUS LENS DIRTY
OR DAMAGED?
NO
IS CUTTING EFFECTED BY THE
HEAT FROM A PREVIOUS CUT?
NO
TRY THE FOLLOWING:
- DECREASE THE POWER
OR
- INCREASE THE FEEDRATE
AND/OR
- DECREASE ASSIST GAS PRESSURE
- ADJUST THE NOZZLE GAP (G87)
- POWER RAMPING OR CORNER
LOOPING
ROUGH EDGE QUALITY DUE TO AN EXCESS AMOUNT
OF HEAT IN THE CUTTING AREA.
SET THE CUTTING PARAMETERS
NO/?
TO THE CLOSEST AVAILABLE
CUTTING CONDITION.
IF SELF BURNING STILL OCCURS
NO/?
SET UP FOR THE CLOSEST
AVAILABLE CUTTING CONDITION.
IF SELF BURNING STILL OCCURS
YES
CORRECT THE CONDITION OF
THE NOZZLE.
CHECK THE FOLLOWING:
- AIR PRESSURE AT CHILLER
NO - SECONDARY PRESSURE OF
ASSIST GAS REGULATOR
(SEE "ROUTINE INSPECTIONS")
- REMAINING GAS IN CYLINDER
- CALIBRATION OF PROG. REGULATOR
YES
CLEAN OR REPLACE THE LENS.
YES
TRY THE FOLLOWING:
- STAGGER THE INTERNAL CUT-
OUTS TO ALLOW THE MATERIAL
TO COOL.
- TURN BEAM OFF AFTER PIERCE
AND ALLOW ASSIST GAS TO COOL
THE PIERCE POINT.
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