Analytical Study Of Drilling Cortical Bone Under Ultrasonic Vibration

A bone drilling is a surgical procedure commonly used to form a hole in a human bone to treat a fracture,install an implant,or perform a reconstructive procedure.But bone drilling surgery is a complex process that involves the sustainable development of human health.Poor surface quality,loose implants,excessive thrust forces,and excessive drilling temperatures can affect a patient’s recovery time or cause a surgical failure.At present,it has been demonstrated that the application of ultrasonic vibration during drilling has certain advantages in the processing of bone materials.Therefore,this paper applies ultrasonic vibration technology to the process of drilling cortical bone,and studies the mechanism of ultrasonic vibration assisted drilling(UAD);the influence of cutting parameters on surface quality and pull-out force;and considering the complexity of the bone drilling process,it will be more The target method is applied during bone drilling while minimizing mechanical and thermal damage.The main research contents are as follows:(1)Firstly,the kinematics of ultrasonic vibration assisted drilling of cortical bone is analyzed.Based on the basic principle of vibration drilling,the running equation is established.The trajectory of the cutting edge of the twist drill,the cutting thickness,the chip breaking mechanism and the shifting characteristics were analyzed,and the image was drawn by MATLAB to analyze the influence of the parameter changes.(2)Designed and carried out a test plan to measure the surface quality of the borehole and the pullout strength of the screw in the borehole.After drilling the fresh cortical bone,the surface profiler and microscope were used to observe and measure the surface quality.The microelectronic universal testing machine was used to measure the pullout strength and then compared with the general drilling test results.(3)The three-dimensional finite element model of ultrasonic vibration assisted drilling of cortical bone was established.The key techniques of friction contact condition,constitutive model selection,boundary condition setting and mesh division established by finite element model were introduced.Based on this,the axial force and temperature during the drilling process were studied using the finite element model and compared with ordinary drilling,constructing an ultrasonic vibration assisted drilling test platform to verify the reliability of the finite element model.(4)Design a simulation experiment using the multi-objective optimization method of the response surface,taking the cutting parameters and vibration parameters as factors,and applying the force and drilling temperature to the target,which is optimized to reduce mechanical and thermal damage during ground drilling and ultimately improve surgical outcomes.