Five Steps to Optimum Marking Parameters

With the material compatibility test, you can quickly lock in the best parameters for marking.The system provides users with a practical approach to setting laser marking parameters, combining material analysis, parameter optimization techniques and effect validation. It helps users solve problems such as unstable marking effects and low efficiency, reducing the cost of trial and error.

Why are materials compatibility tests required?

The surface characteristics of different materials are quite varied--metals are highly reflective, plastics are easily burned, and ceramics are very hard.If a single set of parameters is used for all materials, the result is either that the marking is unclear or the workpiece is damaged.Through a systematic testing process, not only can we protect the lifespan of the equipment, but we can also guarantee consistent and efficient results.

The first step was to become familiar with the characteristics of the material.

First, let's look at the material.

The big categories of metal, plastic, and glass are the first to be sorted.For example, stainless steel requires higher power, while acrylic requires a lower frequency to prevent the edges from melting.A quick glance at a data sheet or a call to the supplier can save a lot of time and effort.

Observe the surface condition.

The rate of absorption of laser light can differ by a factor of three or more between polished, frosted, and coated surfaces.The researchers used the scraps to make a simple test: They passed beams of different powers over the surface, to see which energy range would produce a clear mark without burning.

Step two: Set up the basic framework.

Starting from the recommended equipment values.

Don't rush to be an "inventor." First record the reference parameters given by the equipment manufacturer.For example, a fiber laser might recommend 30W power and 200mm / s speed for marking stainless steel. This is your safe starting line.

The scope of adjustment.

Power output can vary by 20 %, speed by 30 %, and frequency by 5-10 kHz.He stuck three Post-it notes on the operating panel to mark the limits of adjustment for the three critical parameters, preventing him from accidentally dialing in a dangerous value.

Step 3: Parameter combination testing.

Design a test matrix.

Prepare a 10 cm by 10 cm test board, and draw a 3 by 3 grid on it, going from low to high power, and slow to fast speed.For instance, the leftmost nozzle uses 25 watts, the middle nozzle 30 watts, and the rightmost nozzle 35 watts. The speed of each line is 150 / 200 / 250 mm / sec.

The results are then evaluated.

After the print is made, it is immediately examined under a magnifying glass to check the sharpness of the lines, and the edges are felt to see if they are rough.The goal is to locate "clear, non-blurred, high-contrast areas with no material deformation.

Step four: Testing stability.

Continuous processing test.

Use the optimal parameters to mark 20 workpieces, and check the consistency of the markings every five pieces.Pay special attention to the fact that when the ambient temperature is high, equipment that doesn't dissipate heat well may suffer a reduction in power.

Simulation of extreme situations.

Try to put a little bit of oil on the surface of the material or use a curved piece of work.The real parameters should be able to withstand these small real-world accidents.

Step 5: Establish a parameter library.

A three-dimensional record.

The combination of "material + thickness + surface treatment" is recorded in an Excel table, and matched with the three elements of storage capacity, speed and frequency.The next time a similar item is required, 90 % of the time can be saved by calling up the stored data.

The remaining amount is left over for fine tuning.

The manufacturer should be able to provide the following data: 1.After all, the same batch of material may have slight differences, and this flexibility is your safety margin.

Fast and easy troubleshooting.

If the marks are too faint, try raising the frequency by 2-3 kHz; if the lines are broken, check to see if the lens needs cleaning; if the depth is uneven, chances are that the workpiece has not been properly leveled.Keep a notebook handy and write down all your experiences. In six months you'll be the "living dictionary" of the factory.