Simulation And Experimental Research On Rotary Ultrasonic Vibration Drilling

With the wider application of hard and brittle materials,the processing of hard and brittle material holes has become one of the hot issues in the industry.Rotary ultrasonic vibration drilling is considered to be a very effective special processing method for processing this material.This paper takes P20 mold steel and BK7 optical glass as the research objects,selects twist drills and diamond nest drills as tools,and analyzes the current situation of rotary ultrasonic vibration drilling technology,and simulates the theory and process of rotary ultrasonic vibration drilling.As well as experiments for research.(1)Through the study of the basic theory of vibration drilling,the advantages of vibration drilling are explained;based on the movement characteristics of rotary ultrasonic vibration drilling,the material removal mechanism and material removal process of rotary ultrasonic vibration drilling are studied,and combined with previous studies Based on the characteristics of the materials studied in this paper,a theoretical model of material removal rate based on brittle fracture in rotary ultrasonic vibration drilling is derived.(2)Aiming at the problem of vibration drilling of P20 die steel with rotary ultrasonic twist drill,the finite element simulation software Deform-3D was used to simulate the machining process.Taking the axial force and cutting temperature as the experimental indicators,a comparative experiment was designed,and it was concluded that compared with ordinary drilling,ultrasonic vibration drilling can effectively reduce the axial force and cutting temperature;and the single factor of vibration drilling through rotary ultrasonic twist drill Experiments show that the axial force decreases with the increase of spindle speed and amplitude,and increases with the increase of feed speed,while the cutting temperature shows an increasing trend with the increase of spindle speed,feed speed and amplitude.;Through the orthogonal experiment of rotating ultrasonic twist drill vibration,the influence law of drilling parameters on the axial force is verified,and the order of influence degree is as follows:feed rate>amplitude>spindle speed;in addition,the simulation experiment of coolant is carried out,It is concluded that oil-based cooling is better than water cooling,and water cooling is better than air cooling.(3)Set up a rotating ultrasonic vibration drilling experimental system,and conduct experimental research at an ultrasonic frequency of 50 kHz.First,P20 is used as the experimental material to design a comparison and a single factor experiment.The study shows that the conclusions obtained from the experiment verify the simulation,and the range of hole chipping first decreases and then increases with the spindle speed,and increases with the increase of the feed speed.;Emulsion cooling can obtain a smaller axial force and edge collapse range of the hole.Secondly,BK7 was selected to carry out experiments.The research showed that rotary ultrasonic vibration diamond casing drilling can obtain smaller axial force and chipping;the amplitude and frequency are increased,the axial force is reduced,and the degree of axial force is reduced.Increase;reduce the speed,the axial force presents an increasing trend,but the degree of reduction of the axial force is increasing.Finally,based on the basic kinematics theory of rotating ultrasonic vibration,an important analysis of the experimental conclusions is made.