Research On Multi Parameter Monitoring And Vibration Control Of Intelligent Vibration Damping Boring Bar In Cutting Process

Precision deep hole parts are mostly used in important fields such as aerospace.In deep hole boring,due to the large overhang of the boring bar and insufficient stability,tool vibration and other problems occur,which makes it difficult to guarantee the processing quality.The multi-parameters of the cutting state during the machining process can well reflect the machining quality.By monitoring the multi-parameters of the cutting state,the machining parameters can be adjusted reasonably in real time,thereby improving the machining efficiency.Therefore,in response to the need to improve machining accuracy during the boring process of deep-hole parts,this subject proposes an on-line monitoring and vibration control system for multi-parameters(cutting force,tip displacement,vibration acceleration)of the cutting process of intelligent damping boring bars.First,according to the structure of the boring bar and the needs of online monitoring,the overall plan of the cutting process multi-parameter monitoring system is proposed.The components of the monitoring system are analyzed and selected,including the signal acquisition module,STM32 controller,strain sensor,etc.,and designed A multi-parameter monitoring system for cutting status.In order to realize the online monitoring of multi-parameters in the cutting process,the force model of the boring bar is established and the stress analysis is performed on it,and the overall structure of the online monitoring system is established.The multi-parameter monitoring system of the cutting state and the vibration-damping boring bar are integrated.Realize online real-time monitoring of multiple parameters in the cutting process.The sensor is reasonably arranged,the coupling relationship between the output voltage of the monitoring system and the cutting force is obtained through modeling,and the three-way cutting force is obtained through decoupling,and then parameters such as tool tip displacement and vibration acceleration can be obtained.In order to reduce the cutting vibration,a variable stiffness damping boring bar is proposed.The basic idea is to change the stiffness of the vibration absorber inside the boring bar to control the vibration of the boring bar.Through the establishment of a vibration absorber model,the impact of the vibration absorber on the vibration damping performance under different parameters is analyzed.Finally,the signals collected by the monitoring system are processed to extract the cutting force amplitude and vibration frequency,find the minimum vibration point,and then control the stiffness of the vibration absorber to realize online adjustment of the vibration damping performance of the vibration damping boring bar.Build an experimental platform for intelligent damping boring bars,and verify the sensitivity,linearity,lateral interference and other static and dynamic characteristics of the cutting process multi-parameter online monitoring system through static and dynamic experiments.Through the boring experiment,the monitoring results of the cutting process multi-parameter monitoring system and the commercial measurement system are compared to verify the test performance of the system.Finally,the vibration reduction performance of the vibration reduction boring bar is verified by boring experiments.Based on the intelligent damping boring bar cutting process multi-parameter monitoring system,the cutting state multi-parameter online monitoring technology during the boring process is studied.At the same time,the tool's vibration damping performance can be adjusted by adjusting the stiffness of the vibration absorber on the basis of the cutting state multi-parameter monitoring.Realize the on-line control of the vibration of the intelligent damping boring bar.