Scab and pit depth measurement on steel plate
The plate passes beneath an overhead laser profiler on a roller line. Scab height and pit depth are measured in topography separated from the nominal surface; an out-of-limit region is linked to a regrinding decision.
Scab height, pit depth and defect coordinates are added to the plate record; the NG area is shown to the operator for regrinding.
- 01 Plate
- 02 Laser
- 03 Map
- 04 Reference
- 05 Grinding
The plate enters the measurement region on rollers.
- Pit depth
- —
- Scab height
- —
- Defect area
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Plate tilt and motion on rollers can be confused with defect height. A local sound surface is used as the reference to distinguish a scab from a pit.
Solution approach
A laser line crosses the plate and sections accumulate into a topography map during travel. A nominal plane is fitted to the sound area around each defect. Scabs above and pits below this plane are measured separately and their areas mapped to position.
Process steps
- 01
Plate
The plate enters the measurement region on rollers.
- 02
Laser
The transverse laser section samples the surface.
- 03
Map
Sections accumulate in a topography map.
- 04
Reference
A nominal plane is derived from the sound surface.
- 05
Grinding
Scab and pit limits feed the quality decision.
Related applications
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