Crack and grinding-mark inspection on bearing rings
The bearing ring rotates on rollers; directional lighting and a side line-scan camera form an unwrapped image of the polished side face. A region containing a fine crack is marked and the ring is pushed into the reject bin.
Crack location and the unwrapped image are added to the part result; the defective ring is pushed into the reject bin.
- 01 Nest
- 02 Rotate
- 03 Scan
- 04 Analyse
- 05 Reject
The ring enters the roller nest.
- Scanned circumference
- —
- Crack length
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Regular grinding marks and glare on a ground ring can resemble a fine crack. Rotation is synchronized with line images to sample the complete surface at the same illumination angle.
Solution approach
Rollers rotate the ring. A side line-scan camera samples a narrow surface strip under oblique bar lighting; directional light increases local crack contrast. Successive strips form a circumferential unwrapped image and discontinuities distinct from grinding marks are highlighted.
Process steps
- 01
Nest
The ring enters the roller nest.
- 02
Rotate
The rollers turn and directional light switches on.
- 03
Scan
Line images accumulate into an unwrapped surface image.
- 04
Analyse
Local discontinuities are compared with the grinding texture.
- 05
Reject
The cracked ring is pushed into the reject bin.
Related applications
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