5 main criteria for evaluating the quality of CNC cutting machines

Usually, when we judge the cutting quality of a CNC cutting machine, we usually use five factors as the standard. They are the width of the notch, the surface roughness, the verticality of the edge of the notch, the width of the heat-affected zone and the amount of dross. The following small series will explain the judgment criteria of these five factors one by one.

It is one of the important characteristic values u200bu200bto evaluate the cutting quality of the CNC cutting machine, and it also reflects the radius of the small circle that the cutting machine can cut. It is measured by the width of the incision. Most plasma cutting machines have an incision width between 0.15 and 6 mm. Impact:

1. Too wide incision will not only waste material, but also reduce cutting speed and increase energy consumption.

2. The width of the cut is mainly related to the nozzle aperture. Generally speaking, the width of the notch is always 10% to 40% larger than the nozzle aperture.

3. When the cutting thickness increases, it is often necessary to use a larger nozzle aperture, and the cut will be correspondingly wider.

4. As the width of the cut increases, the deformation of the cut piece will also increase.

It is used to describe the appearance of the surface of the notch, and to determine whether the CNC cutting machine needs to be processed again. It measures the Ra value on the cross section at 2/3 of the depth of the cut. Due to the effect of cutting airflow, the main form of longitudinal vibration in the cutting forward direction is cutting ripples. Generally, the surface roughness after oxyacetylene cutting is required to be: level 1 Ra≤30μm, level 2 Ra≤50μm, level 1 Ra≤100μm. The Ra value of plasma arc cutting is usually higher than that of CNC flame cutting machine, but lower than laser cutting (Less than 50μm).

is also an important parameter reflecting the cutting quality, which is related to the degree of reprocessing after cutting. This index is usually expressed by perpendicularity u or angle tolerance. Generally speaking, the U value of plasma arc cutting is closely related to the plate thickness and process parameters, usually in the range of U≤(1%~4%)δ (δ is the plate thickness) and laser cutting U≤0.5mm.

This index is very important for low-alloy steel or alloy steel that can be hardened or heat-treated. Excessive width of the heat-affected zone will significantly change the performance near the notch. The width of the heat-affected zone of air plasma arc cutting is about 0.3 mm, and the width of the heat-affected zone of underwater plasma arc cutting can be narrower.

It describes how much oxidized dross or resolidified material adheres to the lower edge of the incision after thermal cutting. The degree of dross is usually determined by visual observation, and is generally described in terms of no, light, medium, and heavy.

In addition, there are also corresponding requirements for the flatness of the slit, the melting degree of the upper edge and the notch.

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