Web Folding Mechanism Failure Analysis And Structural Optimization

The folding machine in modern printing equipment is a kind of equipment mainly used for thesis media processing,which is commonly found in the three processing processes of modern printing plants before pressing,printing and post-pressing.Although the use of other material media in packaging printing is also on the rise,thesis is still the main carrier.Printing industry processing is mainly divided into books,periodicals,newspapers and packaging processing.The folding machine can quickly fold thesis of different sizes and thicknesses,which is suitable for high-volume folding needs such as rapid printing centers,production enterprises,official correspondence documents and business letters.In the process of using the web,folding operations are inevitable,so the folding mechanism of the web has become the focus of everyone’s attention.This thesis aims to improve the folding performance of web thesis by analyzing the failure and structural optimization of the folding mechanism of web,so as to solve this problem that restricts enterprises.In this thesis,the knife folding mechanism of N160 web printing machine is studied at the bending of the root of the machete arm that is prone to failure under the high speed condition of 36000 rph.Firstly,the research related to the web folding mechanism and the current problems and shortcomings are analyzed.Then,the three-dimensional model of the folding mechanism is established,the kinematics and dynamics of the folding mechanism are analyzed and solved by using MATLAB,its constraints and forces are extracted,the constraint mode analysis of the web folding mechanism is analyzed by ANSYS Workbench,the natural frequency and mode shape of the first six orders of the machete arm are obtained,and the material and structure of the folding mechanism are optimized for the resonance phenomenon,and the new structure is simulated and verified by simulation analysis and experimental verification.Then,through the Transient Dynamics Module in ANSYS Workbench,the rigid-flex coupling transient dynamics analysis of the web folding mechanism was carried out to explore the force and stress strain of the mechanism during the working process,and the relationship between the stress level of the machete arm and the yield strength of the material,and verify whether the strength of the machete arm structure meets the requirements.Finally,the life of the web folding mechanism was evaluated using n Code Design Life in ANSYS Workbench to analyze the service life of the web folding mechanism at 36000 rph.The research results of this thesis provide new ideas and methods for the improvement of web equipment,which have certain theoretical and practical significance,and provide reference for technical improvement and product design in related industries.