CNC cutting machine acceptance standards

In addition to the quality assurance and service commitments provided by the manufacturer, the production and use of any equipment is more important than the quality inspection standards in the industry. Taking into account the various cutting methods that CNC cutting machines can adopt, the quality inspection standards will also be The difference is that plasma cutting is used as an example. What are the relevant standards in the industry?

Users how to measure the quality of the CNC cutting machine purchased, CNC plasma cutting machine cutting quality evaluation index is currently no recommended national standards, only the industry standard: namely "hot cutting plasma arc cutting, quality and size deviation."

The evaluation of plasma arc cutting quality mainly includes the following aspects:

First, the width of the incision:

It is one of the most important characteristic values ​​for evaluating the cutting quality of the cutting machine, and also reflects the radius of the smallest circle that the cutting machine can cut. It is based on the size of the incision at the widest point, most plasma cutting machine incision width between 0.15 ~ 6mm. If the width of the incision is not appropriate it will have an effect:

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

2. The width of the kerf is mainly related to the nozzle aperture. In general, the kerf width is always 10%~40% larger than the nozzle aperture.

3. When the cutting thickness increases, it is often necessary to use a larger nozzle aperture, and the incision will also be widened.

4, increase the width of the incision, will increase the amount of deformation of the cutting piece.

Second, the surface roughness:

It is used to describe the appearance of the cut surface and determine if rework is required after cutting. It is a measure of the Ra value on the cross-section of the incision depth at 2/3. As the result of the action of the cutting air flow in the longitudinal direction of the cutting advance, the main form is the cutting corrugation. The surface roughness after cutting by oxyacetylene method is generally required: Grade 1 Ra ≤ 30 μm, Grade 2 Ra ≤ 50 μm, Grade 1 Ra ≤ 100 μm. The cutting arc Ra value of plasma arc cutting usually exceeds the flame cutting level, but lower than the Laser cutting Ra value (less than 50 μm)

Third, the squareness of the cut edge:

It is also an important parameter that reflects the quality of the cut and relates to the degree of reprocessing that is required after cutting. This indicator is usually expressed in verticality U or angle tolerance. In general, the U value of the plasma arc cutting is closely related to the plate thickness and the process parameters, usually U ≤ (1% to 4%) δ (δ is the plate thickness), and the laser cutting U ≤ 0.5 mm.

Fourth, the width of the heat affected zone:

This index is very important for those hardenable or heat-treatable low-alloy steels or alloy steels. Excessively wide heat-affected zone widths can significantly change the performance near the incision. The width of the heat-affected zone of the air plasma arc cutting is about 0.3mm. When the underwater plasma arc cuts, the width of the heat-affected zone can also be narrower.

V. Slagging amount:

It is to describe how much oxide slag or resolidified material adheres to the lower edge of the cut after hot cutting. The level of dross is usually determined by visual inspection and is generally described in terms of none, minor, medium, and severe.

In addition, there should be customer's corresponding requirements in the straightness of kerf, the melting of the upper edge, and notch.

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