Research On The Variation Law Of Drilling Force And Heat Of Heterogeneous Skeletal Composite Structure

In bone drilling surgery,the cutter will produce drilling force and frictional heat when cutting different bone materials,which will cause mechanical and thermal damage to the bone tissue,which will affect the healing of the postoperative wound area.How to reduce the drilling force and The damage of heat to bone tissue has become a prerequisite for successful bone drilling surgery.This paper takes this background as a starting point to study the law of force and heat evolution and its influencing factors when drilling bone heterogeneous composite materials,and explore the optimal drilling parameters to reduce bone tissue damage,providing theoretical support for the temperature reduction and loss reduction of bone drilling surgery and guidance.Based on the right-angle cutting in metal cutting theory,the micro-element method is used to mathematically analyze the cutting force of the main cutting edge and transverse edge of the drill,and the time is used as the integration point to face the axial direction of drilling different bone materials at different time periods.Mathematical theoretical model of force and torque.Based on the established torque mathematical model,the torque value is used to simulate the heat generation,and the simplified three-dimensional drill bit heat source is a two-dimensional disc surface heat source.The heat source method is combined with the heat conduction equation to establish a temperature mathematical model with time as the integration point.Based on the established mathematical model of axial force and temperature,MATLAB software was used to simulate and analyze the change curve of axial force and temperature with time,and the relationship between drilling parameters and axial force and temperature was explored from the perspective of theoretical analysis.ABAQUS simulation software was used to simulate and analyze different bone materials at right angles.The stress-strain and temperature cloud diagrams for cutting different bone materials at right angles were obtained.The curves of the cutting force and the total force with time were drawn.The influence of cutting parameters on cutting force and temperature on different bone materials.Based on the simulation analysis at right angles,the axial force and temperature changes during the drilling of bone heterogeneous composite materials are simulated and analyzed,and it is concluded that the axial force is distributed in stages and two layers of bone appear at the highest temperature during drilling The conclusion of the material interface area explores the relationship between drilling parameters and axial force and temperature from the perspective of simulation analysis.Based on the Taguchi experiment method,the drilling parameters are optimized,and the optimal values of the axial force and temperature are predicted and calculated under the conditions of the optimal drilling parameters.By analyzing the drilling experimental data,it is concluded that the speed of the drilling process is the primary factor affecting the axial force and temperature,followed by the tool diameter,and the feed rate is the least obvious.Experiments verify the correctness of the theoretical model and finite element model established,and at the same time verify the rationality of the proposed optimal drilling parameter combination.The conclusions drawn from the experimental analysis,theoretical analysis and finite element simulation analysis are compared and discussed.Through analysis,it is concluded that the rotation speed is negatively related to the axial force and positively related to the temperature;The feed rate is related to the axial force that is positively correlated,and negatively correlated with temperature;tool diameter is positively correlated with axial force and temperature.