When companies choose cutting equipment, most will choose CNC plasma cutting machines. CNC plasma cutting giant giant high precision, high speed, moderate price and other characteristics. However, regarding the quality processing standards of CNC plasma cutting machine equipment, there is no clear description in the industry. Taking into account the production and processing needs of different companies, there are differences in the processing requirements of CNC plasma cutting machine equipment, but in the slotting The width, surface roughness, squareness of the kerf edge, the width of the heat affected zone, the amount of dross, we can understand the processing quality of a CNC plasma cutting machine through comprehensive evaluation. Below, Wuhan tyrants will give you details from the following five aspects:
First, the width of the kerf The kerf width is one of the most important eigenvalues ​​for evaluating the processing quality of the CNC plasma cutting machine, and also reflects the radius of the smallest circle that the cutting machine can cut. It is measured at the widest width of the slit, and most plasma cutters have a slit width of between 0.15 and 6 mm.
The easy-to-effect effects of problems with kerf width in CNC plasma cutting machines include:
1. Too wide kerf width will not only waste material, but also reduce 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 width of the slit will also be widened.
4. Increasing the width and width of the slit will increase the amount of deformation of the cutting piece.
Second, the squareness of the square of the width of the kerf is an important parameter reflecting the cutting quality of the CNC plasma cutting machine, and it is related to the degree of reprocessing 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.
Third, the surface roughness It is used to describe the appearance of the width of the slotted surface, to determine whether the need for reprocessing after cutting. It is a measure of the Ra value on the cross section at the width depth 2/3 of the kerf. 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 the oxyacetylene method is generally required: Grade 1 Ra ≤ 30 μm, Grade 2 Ra ≤ 50 μm, Grade 1 Ra ≤ 100 μm. The value of the incision Ra for plasma arc cutting usually exceeds the flame cutting level, but is lower than the laser cutting Ra value (less than 50 μm)
Fourth, the width of the heat-affected zone This index is very important for those hardenable or heat-treatable low-alloy steel or alloy steel, the width of the heat affected zone is too wide will significantly change the performance of the vicinity of 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.
5. The amount of suspended slag describes the amount of oxide slag or resolidified material adhered to the lower edge of the kerf after thermal 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 corresponding requirements for the straightness of the kerf, the melting of the upper edge, and the notch.
In fact, when we judge the quality of a CNC plasma cutting machine, we can identify the above aspects. In order to avoid the purchase of a poor quality cutting machine, you can ask the relevant manufacturer before making the purchase.
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