针对常规的氧助激光切割带有尖角(≤30°)图形的中低碳钢板材过程中存在的尖角“烧蚀率”很高的问题，采用Rofin DC025板条CO2激光切割机系统，在优化的激光切割工艺参数的条件下，通过轨迹变换的方法，在3 mm厚的A3钢板上切割出多种带有尖角(≤30°)图形。系统研究了激光切割尖角图形的切割轨迹及参数对尖角“烧蚀率”的影响。结果表明，采用圆心在所切割尖角角平分线上，且通过该尖角顶点的圆形切割轨迹可大大降低激光切割尖角“烧蚀率”。且对于不同尖角大小(≤30°)该轨迹圆都存在一个最优补偿半径可把尖角“烧蚀率”控制在10%以内，获得理想的切割效果。

Aiming at the problem of high apex angle burnt rate during laser cutting graphics with apex angle (≤30°) on mild or low carbon steel, the laser cutting experiments have been done on A3 steel board with the thickness of 3 mm by using Rofin DC025 slab CO2 laser cutting system and the method of path transformation. At the same time, the key effects of temperature on apex angle burnt have been analyzed, and the influences of path transformation and its radius on apex angle burnt rate have been studied. The results show that the apex angle burnt rate has been greatly reduced under the condition of a special cutting path, which is a circle passing through the zenith of the apex angle and its centre locating on angle bisector. Meanwhile, the apex angle burnt rate can be controlled lower than 10% under the condition of a optimal circle radius for various apex angle.