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The motion simulation of arc welding robot is the basis of the system of robot off-line programming, and it has been one of the important research directions. The UGNX4.0 is adopted to establish 3D simulating model of MOTOMAN-HP6 arc welding robot. The kinematic model under link-pole coordinate system is established by the second development function offered by UG/OPEN API and the method of programming using VC+ +6.0. The methods of founding model and operational procedures are introduced, which provides a good basis for off-line programming technique under Unigraphics condition.