采用控制变量法对GH4037高温合金进行了激光环切打孔实验, 得到了脉冲能量、离焦量、环切速度、环切圈数对小孔锥度和上下孔径的影响规律。结果表明, 脉冲能量和离焦量对小孔孔径和锥度的影响较大, 而环切速度和环切圈数主要影响小孔的形貌。离焦量的绝对值越大, 热影响区、上孔径和锥度也越大; 增加环切圈数及适当的环切速度(3~6 mm/min)有助于提升小孔的质量, 使孔口堆积物减少, 且孔的圆度较好。

The parameter control method is utilized to carry out the experimental investigation on laser trepanning of GH4037 superalloy and the trend in the effects of pulse energy, defocusing amount, trepanning velocity, and trepanning times on the hole taper and entry-exit-hole diameter is achieved. The results indicate that the pulse energy and defocusing amount obviously influence the hole diameter and taper angle, while the trepanning velocity and trepanning times mainly influence the hole morphology. The larger the defocusing amount is, the larger the heat-affected zone, entry hole diameter, and taper angle are. Increasing trepanning times and selecting appropriate trepanning velocity (3-6 mm/min) are helpful to improve the hole quality, reduce the accumulations around hole aperture, and improve the hole roundness.