Research On The Prediction Based On Simulation Results And Experimental Of Bone Grinding Temperature

With the development of science and technology,the improvement of medical level,bone grinding has gradually changed from manual grinding to robot-assisted grinding.Robot-assisted bone grinding has attracted more and more attention in orthopedics surgery due to its good stability,high positioning accuracy,small error and high efficiency.However,most researchers focus on the research of surgical navigation,robot structure and so on.There are few studies on bone grinding process and grinding heat generation mechanism.Based on this background,the method of theoretical analysis,finite element simulation and experiment is used to study the problem of bone grinding.The process of bone grinding and the mechanism of heat generation during grinding were analyzed,and the influence of grinding parameters on the grinding temperature of bone surface was explored.This will play an important role in reducing the surface temperature of bone grinding and improving the grinding quality.Based on the traditional grinding theory,the grinding process is analyzed,and the heat generation mechanism of grinding is deeply studied,and the generation and distribution of grinding zone temperature are described.From the point of view of single abrasive,the cutting mechanism of single abrasive is analyzed,and the abrasive is rationally simplified.The cutting force model of single abrasive is established.The relationship between cutting force of single abrasive and cutting parameters is drawn from the expression of cutting force.Then,taking spherical grinding tools as the research object,the types of moving heat sources during grinding are analyzed,the models of heat flux and grinding temperature in the grinding zone of spherical grinding tools are established,and the relationship curve between grinding surface temperature and grinding parameters is obtained by using MATLAB simulation.On the basis of theoretical analysis of single abrasive cutting,a simplified single abrasive cutting model is established,and ABAQUS software is used to simulate the changes of force and temperature in orthogonal bone cutting mode.By controlling a single variable,the cutting process is simulated under different parameters.The relationship between the cutting force and temperature of a single abrasive particle and the cutting parameters is obtained.Compared with the theoretical analysis results of single abrasive cutting force,the correctness of the theoretical model is verified.Then from the macro point of view,based on the analysis of the moving heat source form of bone grinding,the loading program of the moving heat source is compiled by Fortran language,and the temperature distribution under different grinding parameters is simulated.On the basis of finite element analysis of bone grinding temperature,a grinding temperature prediction model is established based on response surface method,and its variance is analyzed to verify the correctness of the prediction model,and the significance of each factor is analyzed to judge the degree of influence of grinding parameters on temperature.The 3-D response surface and 2-D contour map of grinding parameters and temperature are obtained,and the relationship between factors and response is expressed intuitively.A bone grinding test bench was designed and built.The fresh calf bone,which was the closest to human bone,was used as the experimental object.The artificial thermocouple was used to measure the temperature of grinding process,and the maximum temperature under different grinding parameters was obtained.Compared with theoretical value,simulation value and prediction value,the rationality of theoretical research method and the validity of simulation data are verified.The reasons for the difference between theoretical and experimental results are analyzed.