管锥相贯焊接坡口数控切割

利用空间解析几何的原理建立了管锥相贯数学模型，用参量方程描述了管端相贯线焊接坡口的几何形状，该数学模型可应用于三轴联动火焰数控切管机。针对三轴联动火焰数控切管机，分析了管锥相贯焊接坡口数控切割运动，将切割运动分解为割炬绕被切管的回转、沿管轴线的平移及在轴剖面内的倾斜三轴联动，给出了数控切割所需相贯线、两面角、实际切割角等参数的参量表达式。并研究了应用过渡切割方法解决小角度存在的问题，给出了过渡切割时各参数的数学表达式。切割试验结果表明，所切焊接坡口完全符合美国石油协会标准(API)规范。

Numerical control cutting of welding groove for intersecting of pipe and cone

According to spatial analytic geometry,the mathematical model of intersecting of pipe and cone was established.The geometry shape of intersecting curve welding groove at the end of pipe was described in parameters equation.The mathematical model could be used in flame numerical control(NC) pipe cutting machine,and the machine's three axis could move together.The movement of NC cutting of welding groove for intersecting of pipe and cone was also analyzed.The torch movement was divided into three axis motion,rotation around the pipe,travel along the pipe,and bevel in axis section.The parameters for NC cutting such as intersecting curve,dihedral angle,torch bevel angle were expressed in parameters equation.And transition cutting was studied in order to solve small angle problem,and parameters in transition cutting were also given.The results of practice showed that the parameters of welding groove met the requests of American Petroluem Institute criterion.