凹版印刷机导向辊的挠曲变形分析及结构优化

Flexural Deflection Analysis and Structure Optimization of Guide Roller in Gravure Printing Machine

目的导向辊是保证凹版印刷机印刷薄膜稳定传输最重要的部件,导向辊在薄膜张力及重力作用下容易发生挠曲变形。对导向辊进行挠曲变形分析和结构优化,在保证挠曲变形不影响薄膜套印精度的前提下,提高导向辊的随动性。方法根据导向辊自身结构特点,基于Ansys将导向辊简化为多体组合的连续简支梁模型,通过施加弹簧单元来仿真轴承对导向辊的作用,对不同壁厚的导向辊进行挠曲变形仿真分析,分析导向辊挠曲变形对印刷套印精度的影响。结果对导向辊建立了多体组合的有限元模型,得到了导向辊的挠曲变形曲线。当导向辊直径为?120mm,筒体长为1100mm,轴头长为110 mm,薄膜和导向辊的包角为90°时,工程实际使用的4.5 mm壁厚导向辊的最大挠曲变形值为51.208。结论导向辊最大挠曲变形发生在导向辊轴线方向的中间位置,其变形值随壁厚的增加而降低,壁厚对导向辊的挠曲变形影响较为明显,根据文中研究结果,对导向辊结构的壁厚进行优化后,导向辊的随动性得到了提高,从而可以提高薄膜传输质量。

Objective The guide roller is an important part to ensure the stable transmission of the printing web in gravure printing. Bending deformation occurs in the roller due to the web tension and the gravity of the roller. Flexural deflection analysis and structure optimal design were developed in order to improve the follow-up property of the guide roller. Methods According to the guide roller＇s own structure characteristics, the guide roller was simplified to a continuous beam model based on Ansys software. A spring element was used to simulate the effect of the bearings. Rollers with different wall thickness were analyzed. The relationship between printing precision and the roller deformation was analyzed. Results A multi-body combination finite element model was established for flexural deflection analysis. When the radius of the guide roller was.120 mm, the length of roller body was 1100 mm, the length of the shaft head was 110 mm, the wrap angle between the web and the guide roller was 90 degrees, the wall thickness of the guide roller was 4.5 mm in engineering practical use. Conclusion The maximum deformation occurred in the middle of the guide roller in axial direction. With the increase of wall thickness, the deformation value increased. The effect of wall thickness on the bending deformation of the guide roller was obvious. According to the results of this paper, the follow-up property of the guide roller was improved after optimization of the wall thickness. So the web transfer quality could also be improved.