(1) Cut width. It is one of the most important characteristics for evaluating the cutting quality of a cutting machine, and also reflects the radius size of the smallest circle that the cutting machine can cut. It is measured by the size of the widest cut, with most plasma cutting machines having a cut width of 0.15-6.0mm. The impact is as follows: a. An excessively wide cut not only wastes material, but also reduces cutting speed and increases energy consumption; b. The width of the incision is mainly related to the nozzle aperture, which is generally 10% to 40% larger than the nozzle aperture; c. When the cutting thickness increases, it is often necessary to use a larger nozzle aperture, and the incision will also be widened accordingly; d. Increasing the width of the incision will increase the deformation of the cutting piece.

（2）表面粗糙度。它是用来描述切口表面的外观，确定切割后是否需要再加工的标准，也是测量切口深度2/3处横断面上的Ra值。由于切割气流的作用在切割前进方向上产生纵向振动的结果，主要形成切割波纹。一般要求氧乙炔法切割后的表面粗糙度：1级Ra≤30μm,2级Ra≤50μm,3级Ra≤100μm.等离子弧切割的切口Ra值通常超过火焰切割的水平，但是低于激光切口Ra值（小于50μm）。

(2) Surface roughness. It is used to describe the appearance of the cut surface, determine whether further processing is necessary after cutting, and also measure the Ra value on the cross-section at 2/3 of the cut depth. Due to the effect of cutting airflow, longitudinal vibration is generated in the cutting direction, mainly forming cutting ripples. General requirements for surface roughness after oxyacetylene cutting: Grade 1 Ra ≤ 30 μ m. Level 2 Ra ≤ 50 μ m. Level 3 Ra ≤ 100 μ m. The notch Ra value of plasma arc cutting usually exceeds the level of flame cutting, but is lower than the laser notch Ra value (less than 50 μ m) .

（3）切口棱边方形度。它也是反映切割质量的重要参数，关系到切割后所需要再加工程度。该指标常用垂直度U或角度公差来表示。一般等离子弧切割时其U值与板厚、工艺参数关系密切，通常U≤（1%~4%）δ（δ为板厚）。

(3) The squareness of the cutting edge. It is also an important parameter that reflects the cutting quality and relates to the degree of rework required after cutting. This indicator is commonly represented by verticality U or angle tolerance. During general plasma arc cutting, the U value is closely related to the plate thickness and process parameters, usually U ≤ (1%~4%) δ （ δ Is the thickness of the plate.

（4）热影响区宽度。该指标对于那些可硬化或可热处理的低合金钢或合金钢非常重要，过宽的热影响区宽度会明显改变切口附近的性能。空气等离子弧切割的热影响区宽度约0.3mm,水下等离子弧切割时，热影响区宽度还可以更窄。

(4) The width of the heat affected zone. This indicator is very important for low alloy or alloy steels that can be hardened or heat treated, as an excessively wide heat affected zone width can significantly alter the performance near the notch. The width of the heat affected zone in air plasma arc cutting is about 0.3mm, and the width of the heat affected zone can also be narrower during underwater plasma arc cutting.

（5）挂渣量。它是描述热切割后在切口下缘粘附的氧化物熔渣或重新凝固材料的多少。挂渣的等级通常是靠肉眼观测来确定的，一般用无、轻微、中等和严重等描述。另外，对割缝直线度、上缘的熔化度以及缺口等也应该有相应的要求。

(5) The amount of slag hanging. It describes the amount of oxide slag or re solidified material adhered to the lower edge of the incision after thermal cutting. The level of slag residue is usually determined by visual observation, and is generally described as none, mild, moderate, and severe. In addition, there should also be corresponding requirements for the straightness of the cutting seam, the melting degree of the upper edge, and the notch.

既然切割质量对于数控等离子切割机来说非常重要，那么提高切割质量对数控等离子切割机有什么要求呢？

Since cutting quality is very important for CNC plasma cutting machines, what are the requirements for improving cutting quality for CNC plasma cutting machines?

（1）数控等离子切割机的各功能部件必须紧密结合。轴承、销孔的间隙不能过大，因为切割过程是在铸坯的移动情况下同时进行，各部件的松动会引起割枪的摆动，进而影响到切割效果。

(1) The functional components of the CNC plasma cutting machine must be closely integrated. The clearance between bearings and pin holes should not be too large, as the cutting process is carried out simultaneously with the movement of the casting billet. The looseness of each component can cause the cutting gun to swing, thereby affecting the cutting effect.

（2）切割机中割枪的摆动、定位控制件斜板不宜过短。

(2) The swing and positioning control components of the cutting gun in the cutting machine should not be too short.

（3）割枪位置必须要固定好，高度合理且要垂直，前后、左右都不能有偏差。

(3) The position of the cutting gun must be fixed, the height should be reasonable and vertical, and there should be no deviation in front, back, left, or right.

（4）等离子电源的选择必须要于切割材料的厚度相匹配，否则会直接影响到数控等离子切割机的切割质量。

(4) The selection of plasma power supply must match the thickness of the cutting material, otherwise it will directly affect the cutting quality of the CNC plasma cutting machine.

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