薄膜传输系统导向辊的力学特性分析

Mechanical Behaviors of Guide Roller in Web Transfer System

为了提高薄膜传输的精度和稳定性,根据导向辊的结构特点,建立了多体组合的有限元模型,分析了导向辊的挠曲变形、模态、谐响应和不平衡激励变形,并对静态时的挠曲变形进行了试验测试。研究结果表明:导向辊的壁厚、辊体长度和轴头长度等是影响导向辊力学特性的主要因素;采用目前企业常用的导向辊结构参数和生产工艺参数,导向辊在薄膜张力、自身重力以及不平衡质量激励下的最大变形值为52.725μm;如果将导向辊筒体的壁厚从4.5mm减小为3.5mm,其他条件不变,虽然会使导向辊结构的最大变形值提高为58.108μm,但临界转速可从8 255.1r/min提高到8 309.94r/min,随动比则可从0.920提高到0.982,从而有利于提高薄膜传输的精度和稳定性。

To improve the accuracy and stability of the web transfer, a multi-body combined finite element model is established according to the structural features of the guide roller. The guide roller bending deformation, the vibration modes, the harmonic response, and the deformation under unbalanced excitation are analyzed, and the experimental test of the static flexural deformation is performed. Research results show that the structural parameters of the guide roller, such as the wall thickness, the roller length, and the gudgeon length, etc. , are the main factors influencing the guide roller mechanical behaviors. Keeping the structural parameters of the guide roller and other process parameters generally used in the industry unchanged, the maximum deformation value of the guide roller caused by its own gravity, the web tension and the unbalanced mass is 52. 725μm. If the wall thickness of the guide roller is reduced to 3. 5 mm from 4.5 mm, the maximum deformation of the guide roller is 58. 108/lm while the critical speed is increased to 8 309.94 r/min from 8 255.10 r/min and the follow-up ratio is increased to 0. 982 from 0. 920, which is helpful to improve the accuracy and stability of web transfer.