Research On Vibration Characteristics And Optimal Control Of Multi-wire Saw At High Wire Speed

The diamond wire multi-wire saw has become the mainstream equipment for cutting hard and brittle materials due to its advantages of high efficiency,high productivity and high accuracy.With the continuous development of multi-wire saw in the direction of high-speed,problems such as vibration,heat,noise and synchronous control have become the technical barriers restricting its progress.And because it is a new type of machine tool developed in recent years,there is relatively little domestic research.Therefore,this thesis decides to study its vibration characteristics and optimal control strategy at high wire speed,and uses finite element software to carry out simulation and experimental verification of its dynamic characteristics.This thesis can improve its anti-vibration performance,control the vibration of the whole machine and provide theoretical reference for the high-speed development and design of multi-wire saw through the multi-objective optimization design of the existing structure size.The main research contents include:(1)The vibration reason of multi-wire saw is analyzed,and the mechanical and mathematical models of the whole frame and wire saw are constructed.This thesis can provide theoretical reference for dynamic characteristics research and structural optimization design.(2)The finite element transient dynamic simulation analysis is carried out for the main frame and the whole frame,and the modal harmonic response analysis is carried out for the whole frame and the wire saw.The dynamic characteristics of the main frame,the whole frame and the wire saw are comprehensively understood through the simulation of the dynamic characteristics under different working conditions to obtain the laws of time period and boundary conditions.(3)The reliability of the finite element simulation is verified by experiments,and the multi-objective optimization design is carried out for the existing structural dimensions of the whole frame.According to the results of sensitivity screening and response surface construction,the dimensions that have a great impact on the vibration of the whole frame and the relationship between the parameter variables and the optimization objectives can be obtained.The relevant dimensions can be controlled and optimized pertinently to reduce the amplitude of each part and increase the natural frequency,thereby improving the dynamic stiffness of the structure and improving its anti-vibration performance.(4)This thesis will analyze the cause of wire break of multi-wire saw at high wire speed,check and optimize the guide wheel of important parts,control the vibration of main shaft,analyze and study the intelligent direction of slice quality prediction and real-time display of wire bow,and summarize the comprehensive vibration control strategy,so that it can still maintain good operation stability when running at higher wire speed.