Research On Bone Reconstruction Based On Reverse Engineering And 3D Printing Technology

In this paper,titanium alloy(TC4)is used for metal 3D printing of bones,and the research is carried out by a combination of reverse engineering and experimental verification.The specific method is to use relatively complete and advanced hardware experimental equipment and reverse molding technology,use medical reverse engineering,finite element analysis and other supporting software as tools and platforms,and set the printer process parameters to analyze its surface quality and micro performance,and finally The bone restoration is obtained by printing,and the specific content is as follows:(1)Reverse modeling of fractured ankle joint.First obtain the CT image of the patient's fractured ankle joint,use Mimics software to reconstruct the threedimensional model of the medical tomographic image,and then import the reconstructed bone model into the reverse engineering software Geomagic for processing,including repair and surface optimization of the fracture model,Accurate surface and solidification,and finally generate a smooth CAD solid model.(2)Finite element analysis of ankle joint model.Mesh the model and define the material properties of the titanium alloy,and apply different load forces according to the force.By viewing the total deformation cloud map and the total stress cloud map,the maximum deformation of the ankle joint model is 0.0113 mm at the top and the bottom deformation The maximum amount is 0.03645 mm,the maximum principal stress at the top is 34.415 MPa,and the maximum principal stress at the bottom is110.35 MPa.According to the analysis,it can be known that it meets the mechanical requirements(3)Titanium alloy printing and result analysis.First,by using the orthogonal experiment method to control the variables,explore the influence of the laser scanning power and scanning speed on the geometric size and roughness of the test piece under3 D printing,and analyze a more reasonable parameter range.Secondly,on the one hand,conduct surface quality analysis on the test piece,including geometric size,roughness and hardness analysis;on the other hand,conduct microscopic performance analysis on the test piece,including surface microstructure,metallographic structure and microhardness analysis,comprehensive analysis After determining a set of optimal parameters,the laser power is 240 W,and the scanning speed is 800mm/s.Finally,use this parameter to print the ankle joint,and perform organization analysis and error comparison on the printed model.It is found that the standard deviation is 0.0191 mm,indicating that this set of parameters meets the requirements.The research results show that it is feasible to use reverse engineering combined with 3D printing technology,software and experiments to produce artificial bones that are more in line with clinical conditions.This method can guide clinical experiments,formulate personalized surgical plans and reduce cycle costs.