Applications in the field of identification

A 100% quality check of punched metal parts (cogwheels) is performed in a testing cell for the automotive industry. The testing cell is subsequently integrated into the line. A typical part-conveying situation: The part lies on a dirty, dark conveyer belt. In these hardly ideal conditions, various lighting techniques are needed to improve image quality.

Task:

• Presence of chad between the cogs
• Presence of grits in the cogs and the square geometry
• Geometrically offsetting the square against the external teeth
• Contact-free monitoring of cap-nut geometries
  Presence of the internal thread
• Adequate depth of thread, independently of the runout

Problem:

Varying surface quality of the parts: shiny, matt, discoloured.

Adjustment to different parts.

Solution:

The answer for this part is dark-field lighting. It accentuates edges and makes contours easily visible, even against dark backgrounds.