Research on structure optimization and geometric accuracy analysis of laser cutting machine

This study is focusing on a working area of 720 mm×600 mm on a laser cutting machine. Use finite element analysis method to analyze its overall structure.The geometric error model of laser cutting machine is established. In order to analyze the geometric accuracy and position accuracy of the machine, the laser interferometer was used to test straightness, angle deviation and motion speed of the machine under dynamic and static situation.The finite element structural optimization design method is used to improve the structure and reduce the deformation gap at both ends of the gantry frame of the laser cutting machine. Meanwhile the errors in straightness and angle deviation have greater impact on machine accuracy. The straightness under static situation is larger than it is under dynamic situation. The motion speed, assistant pressure did not affect the straightness. Results show that to improve machine′s geometric accuracy, position accuracy and machining accuracy, it is useful to apply design and assembly optimizations.