Research On Vibration Control And Analysis Of Cutting Blade Of Cutting Machine

Flexible materials such as leather,clothing,and cardboard boxes are closely related to people's daily life and work.At present,cutting of domestic flexible materials such as clothing and leather is a typical labor-intensive industry,which only produce a single kind of product,have low production level and efficiency while high labor intensity.Restricting the development of China's textile industry,the emergence of CNC cutting machines has overcome the following shortcomings in traditional production:high labor costs,low material utilization and low production quality.The fully automatic CNC cutting machine currently produced in China can achieve basic fabric cutting,but there is still a problem that the cutting blade has a large vibration during the cutting process.Due to the vibration of the cutting blade,the working performance and service life of the internal components of the blade is seriously affected,at the same time,vibration is also accompanied by noise,which will influence health of workers and reduce production efficiency,therefore,vibration control of the cutting blade is very critical.Cutting blades have the advantages of high-speed cutting and high cutting accuracy,which is the development direction of flexible materialcutting and processing.In China,the cutting accuracy,vibration speed,noise control,reliability and service life of cutting blades are far lower than the world advanced level.This is mainly due to the lack of research on the structural design and analysis of cutting blades.Therefore,this paper combines the methods of kinematics,dynamics,structural optimization design theory,dynamic balance analysis,finite element analysis,and experimental verification to study the vibration analysis and control of the cutting head of the cutting machine.The entire control process can be simply divided into the following parts.First of all,the kinematic analysis is preformed on the transmission part of the cutting head,and the head is simplified as a crank slider mechanism.Then the acceleration expressions of the crank,connecting rod and slider are calculated respectively.The acceleration of the connecting rod and the slider is constantly changing with the angle,and mechanical calculations are performed on each part of the crank slider,and calculate the inertial force,moment of inertia and centrifugal force generated by the mechanism during the movement.The inertia force?moment of inertia and centrifugal force is an important factor that generates vibration,and analyze the reason for the vibration,and all the things done are prepared for the subsequent structural optimization;By using the fatigue safety factor condition to perform fatigue check on the cutting head,it is obtained that the cutting head before optimization does not meet thefatigue strength condition,through these calculations,it provides a theoretical foundation for the later structural design of key components.The second step is to propose a structural optimization plan based on the previous theoretical calculation of the cutting blade.Through the design of the steering group to improve the overall structural stiffness,lightweight design of the connecting rod connecting seat,the calculation and selection of the vibration damping spring,the choice of vibration damping materials,the use of dynamic balance theory to calculate the weight of the eccentric wheel,theoretically reduce the inertia force of the structure,by using Solid Works software to establish the optimized cutting head model,and using Motion plug-in to simulate the cutting head motion before and after the optimization.By comparing the peak value of the counter-force fluctuation at the standing of the bearing,the correctness of the theory is verified through simulation analysis,and conclude that the inertia force in the optimized cutter head structure is effectively reduced,which effectively reduces the effect of vibration from the inertia force.The third step is to use ANSYS Workbench software to analyze the structure of the cutting head after optimization,and perform a static analysis on the entire cutting head.It is found that the driving link parts are prone to fatigue damage.Then the modal analysis is performed on eccentric gear,driving connecting rod,steering group and rack toconcluded that the motor excitation frequency avoids the natural frequencies of each order of each component,and avoids the resonance phenomenon of the structure.The fatigue analysis is performed on the driving link,It concludes that the driving connecting rod meets the design requirements.The rationality of structural optimization and the effectiveness of vibration control are proved by finite element analysis.Finally,set up an experimental platform,conduct vibration experiments and noise experiments on the designed cutting head,and use MATLAB software to organize the measurement data and draw a graph.Through practice,it is concluded that the vibration of the cutting blade is effectively controlled,which proves the accuracy of the theoretical research and is a powerful support for the theoretical research analysis.