(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。它是用來描述切口表面的外觀，確定切割后是否需要再加工的標準，也是測量切口深度2/3處橫斷面上的Ra值。由于切割氣流的作用在切割前進方向上產生縱向振動的結果，主要形成切割波紋。一般要求氧乙炔法切割后的表面粗糙度：1級Ra≤30μm,2級Ra≤50μm,3級Ra≤100μm.等離子弧切割的切口Ra值通常超過火焰切割的水平，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）切口棱邊方形度。它也是反映切割質量的重要參數，關系到切割后所需要再加工程度。該指標常用垂直度U或角度公差來表示。一般等離子弧切割時其U值與板厚、工藝參數關系密切，通常U≤（1%~4%）δ（δ為板厚）。

(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）熱影響區寬度。該指標對于那些可硬化或可熱處理的低合金鋼或合金鋼非常重要，過寬的熱影響區寬度會明顯改變切口附近的性能。空氣等離子弧切割的熱影響區寬度約0.3mm,水下等離子弧切割時，熱影響區寬度還可以更窄。

(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）掛渣量。它是描述熱切割后在切口下緣粘附的氧化物熔渣或重新凝固材料的多少。掛渣的等級通常是靠肉眼觀測來確定的，一般用無、輕微、中等和嚴重等描述。另外，對割縫直線度、上緣的熔化度以及缺口等也應該有相應的要求。

(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.

既然切割質量對于數控等離子切割機來說非常重要，那么提高切割質量對數控等離子切割機有什么要求呢？

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）數控等離子切割機的各功能部件必須緊密結合。軸承、銷孔的間隙不能過大，因為切割過程是在鑄坯的移動情況下同時進行，各部件的松動會引起割槍的擺動，進而影響到切割效果。

(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）切割機中割槍的擺動、定位控制件斜板不宜過短。

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

（3）割槍位置必須要固定好，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）等離子電源的選擇必須要于切割材料的厚度相匹配，否則會直接影響到數控等離子切割機的切割質量。

(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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