点焊伺服加压装置的设计及特性分析

Design and characteristics analysis of spot welding servo pressure device

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China

摘要: 针对目前普遍使用的气动点焊机在焊接中有压力波动,且焊接过程中压力不可调,设计了一种点焊伺服加压装置,具有电极与工件软接触、加压速度快、压力控制精确等特点;针对所设计的伺服加压装置,进行动力学分析,并且根据采用的控制方式,建立装置的传递函数模型和基于主导极点的等效参考模型,获得了伺服加压装置的机械参数与系统的阻尼比、固有振荡频率之间的关系,分析了机械参数对系统的稳定性和动态特性的影响.
- 电阻点焊 /
- 伺服加压 /
- 动态特性
Abstract: A spot welding servo pressure device was designed to solve the fluctuation and non-control of pressure during spot welding process with pneumatic welding gun.The developed device had the advantages of soft contact between the electrodes and workpiece,quickly imposing pressure and accurate pressure control.Dynamic analysis was carried out on the designed servo pressure device,and a transfer function model based on the control mode and equivalent reference model based on the dominant pole were established.The relationship between the mechanical parameters of the servo pressure device and its damping ratio and natural oscillation frequency was acquired,and the influence of mechanical parameters on the system stability and dynamic characteristics was also analyzed.
- resistance spot welding /
- servo pressure /
- dynamic characteristic

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