The laser marking of data, for traceability, is represented by selected manufacturing information. This includes drawing numbers, manufacturer’s reference and part numbers. The process area is a curved surface, and therefore care must be applied when setting up and marking. 2D matrix codes are used, as part of this traceability requirement. The text height is 2mm.
The tooling allows for the part to be set up, with the focal point of the laser set half way between the maximum and minimum height positions relative to the marking area. This reduces any potential distortion, created when the focal position moves in and out of focus, around the radius during the marking process.
The fibre marking process, allows for the image to be produced to almost a black contrast level. Referred to as annealing, the mark element of the material is heated up, creating the colour change. No material is vaporised during the process. The mark is permanent, due to the discolouring taking place to a depth of probably around the 10 – 20 micron level. This process only works on steel based products, and effectively is the surface oxidising.
As fibre lasers can pulse at very high rates, it is possible to run the system very fast, developing multiple passes, to build up the darkness and depth of the mark, and still achieve commercially acceptable per unit rates.
If you would like further information on this laser application, or any other application, please request a call back or talk to one of our laser marking specialists on 01737 826902.