Research On Performance Improvement Of Rotary Ultrasonic Grinding Tool System

Hard and brittle materials have the advantages of high brittleness,high hardness,oxidation resistance and corrosion resistance,and are widely used in photovoltaic power generation,electronics,optics,instrumentation and aerospace and other fields.However,when the traditional grinding technology is used to finish the material,problems such as surface micro-cracks and micro-breaking are prone to occur.In recent years,the rapid development of rotary ultrasonic grinding technology has solved many problems in the field of finishing hard and brittle materials.In this paper,through the design of the resonant system of rotary ultrasonic grinding and the design and improvement of the tool system structure,a set of rotary ultrasonic grinding tool system that can be installed in the machining center is developed,and its performance is tested.Combined with the structure of the rotary ultrasonic grinding tool system,the theoretical analysis of dynamic balance adjustment is carried out by adding a balance screw to prepare for the next grinding test.The main research contents of this paper are as follows:In this paper,an ultrasonic resonance system is designed using parallel grinding wheels,composite amplitude horn and ultrasonic transducers.Based on Mindlin medium and thick plate theory and the longitudinal vibration theory of the composite amplitude transformer,the theoretical model of the parallel grinding wheel composite horn is established,and the theoretical derivation is carried out,and the development of the calculation tool for the parallel grinding wheel composite amplitude transformer is completed.The parameters of the parallel grinding wheel compound horn are obtained,and the finite element analysis software is used for simulation verification to verify the reliability of the design method.Aiming at the problem of low rotation accuracy of the rotary ultrasonic grinding tool system,the structure of the components that make up the tool syst em is improved and designed,and the structure of the BT40 tool holder sleeve and the flange position of the composite amplitude horn is improved,and the finite element simulation is carried out.The influence on the ultrasonic resonance system before and after the improvement is analyzed and compared,and the dimension design of its components is completed.And by improving the matching accuracy between the components of the tool system,the goal of improving the rotation accuracy is achieved.In order to carry out the dynamic balance of the rotary ultrasonic grinding tool system,a corresponding dynamic model is established,the unbalanced situation is analyzed,the dynamic balance of the tool system is adjusted by adding a balance screw,and the adjustment position of the balance screw is theoretically analyzed and solved.according to the ISO-1940 balance level standard,the maximum allowable unbalance amount of the rotary ultrasonic grinding tool system is obtained,which provides a theoretical basis for the adjustment of its dynamic balance.In order to test the performance of the rotary ultrasonic grinding tool system,the parts were machined and the tool system was assembled.The ultrasonic resonance system was subjected to impedance analysis tests and ultrasonic resonance tests to verify the stability of the ultrasonic resonance system and the reliability of the theoretical design.The ultrasonic grinding tool system and its components are accurately measured in preparation for the next processing test.