Powerful function in three-dimensional design, SolidWorks now has found a wide range of applications in industrial design. The parametric design system of precision forging gear die in this paper is developed with VB language based on SolidWorks environment. It is described in detail that the establishment of important components of gear die in the three-dimensional model, the relation between parameters of the interface and model, and parameters drive mechanism. Input parameters in windows of VB interface, are automatically calculated the precise parameters of the gear part and geometric dimensions of the important components of the gear die. According to the input arameters, the three-dimensional model of the gear die’s assembly drawings is generated on SolidWorks environment. The parametric design system is able to shorten the time for constructing the 3D model of the precision forging gear die and improve the quality of the die design.

Vibration is one of the most important problems in laser cutting machine tool, which causes the manufacturing errors, also influences the machining accuracy of the parts. Modal analysis can calculate vibration type of structures. The paper presents how to use the powerful FEA software ANSYS to do the modal analysis on laser cutting machine tool and also studies the undamped free vibration on laser cutting machine tool. Finally, the test results and theoretical results were compared to verify the rationality of the modal, these provide theoretical base and conditions for dynamics analysis and optimal design.