This system performs in-line surface flaw inspection of steel billet utilizing fluorescent magnetic particle testing method while the billet being transferred on the V-roller conveyor. All surfaces and corners of the billet is visually inspected and marked by inspectors for removal in the grinding process later.
- In-line continuous inspection during the billet being transferred
- Low equipment cost, less installation space
- Flaw inspection can be done by two inspectors. This is less than one half compared to required number of inspector of Axial electric current magnetization method.
- Detecting longitudinal, transverse and corner defects simultaneously
|Type of steel to be inspected||Carbon steel, Low alloy steel and Special steel|
|Dimension||Square billet 120-160 mm sq.|
|Billet transfer speed||Max. 15 m/min. (V-roller transfer)|
|Magnetizing method||Combined magnetization with Yoke coils and Ring coil|
|MPT material||Fluorescent magnetic particle suspension|
|Defects to be detected||Surface breaking natural flaws (crack, scab etc.)|
|Detecting accuracy||Longitudinal flaw (crack): more than 0.3 D x 10 L mm
Transverse flaw (scab) : more than 0.3 D x 10 dia. mm
|Electric power||AC 400/440 V±10%, 3-phase, approx. 150 KVA|
|Air||More than 0.4 MPa, 5.0 Nm3/min.
Normal consumption : approx. 0.8 m3/min.
|Water||Service water 100 L/min.|
|Suspension spraying equipment||Suspension spray nozzles|
|Magnetizing equipment||(4 sets of Yoke coils and one Ring coil) x 2 sets|
|Suspension tank||500 L tank with circulation pump|
|UV light||Super-Light E-40-2 x 8 sets, Mirror units|
|Control equipment||Control panel, Magnetizing power source panels, Local operation panel|