曲率半径和切速对小管径激光切缝宽度的影响

The effects of curvature radius and cutting speed on the top kerf width of laser cutting of thin pipe with a small diameter

研究了曲率半径(管径)和切割速度对薄壁小管径(外径D<80mm,壁厚t=2.5mm)无缝钢管激光圆周切缝宽度的影响,发现:(1)随着激光切割圆周角度(弧长)的增加,切缝宽度增加;(2)在相同激光工艺参数条件下,随着曲率半径(管径)的减小,圆周平均切缝宽度增加,且当D<25mm时,圆周平均切缝宽度急剧增加;(3)随着切割速度的增加,圆周平均切缝宽度减少。曲率效应和激光作用时间不同是造成上述现象的主要原因。最后提出,为了获得均匀宽度的圆周切缝,对于薄壁小管径无缝钢管激光切缝,应采取变工艺参数的措施。

The effects of curvature radius and cutting speed on the top kerf width of circumferential laser cutting of thin seamless steel pipes with a small diameter (outer diameter of pipe D <80mm and wall thickness t =2.5mm) were investigated experimentally .Experiments showed three main conclusions:(1)as the cutting curve length increases,the top kerf width of laser cutting also increases ,(2)the average top kerf width of laser cutting increases with decreasing curvature radius,and increasing quite dramatically as D is less than 25mm,(3)as the cutting speeds increase ,the average top kerf width of laser cutting decreases.The main reasons are curvature effects and different laser interacting on times.At last, the authors regard that variable parameters are necessary for people to adopt in order to obtain a uniform kerf width for thin seamless steel pipe with a small diameter.