Design And Simulation Of A 5-DOF Hybrid Machine Tool For Photocatalytic Colloid Jet Polishing

With the increasing incidence of bone and joint diseases,the demand for artificial joint prostheses has also increased.The surface quality of artificial joints is closely related to their service life and the surface processing quality of domestic artificial joints needs to be further improved.The hybrid machine tool has the characteristics of no cumulative error,high precision,good stability,and high flexibility of the traditional series machine tool with large stroke,high speed and parallel machine tool.Now it is widely used in the field of complex curved surface processing.Combining the XY-3-RPS hybrid machine tool with the jet polishing technology to perform jet polishing of the artificial bone joint surface is of great significance for improving the surface quality of the artificial joint and promoting the progress of national medical equipment.This paper designs a hybrid five-degree-of-freedom polishing machine for artificial joint jet polishing.The specific work content and thesis results are as follows:First,design a 2+3 structure hybrid machine tool.According to the momentum value,the parallel part is selected from the 3-RPS and 3-UPU with two-revolution and one-shift motion characteristics,and the series cross platform is combined to realize five freedoms.Coupled movement in the degree direction.Secondly,establish the mathematical model of inverse kinematics of the XY-3-RPS hybrid machine tool and derive the mathematical model of the concomitant displacement.Based on the vector construction theory,establish the speed Jacobian matrix of the 3-RPS parallel part and the XY-3-RPS hybrid machine tool.Calculated its Jacobian matrix condition number,used MATLAB to solve the rod length curve,dexterity,accompanying displacement and reachable working space cloud diagram,determined the structural parameters of each part of th e XY-3-RPS hybrid machine tool,and then completed the drawing and drawing of each part.Assembly work.Thirdly,on the basis of the statics theory of stiffness and flexibility of XY-3-RPS hybrid machine tool,based on the principle of dummy power,the mathematical pattern of statics and the mathematical model of stiffness are established.Carry out finite element simulation analysis,obtain the stress and strain cloud diagram of each part,and determine that the designed structural parameters meet the accu racy requirements and the main accuracy influencing factors.MATLAB and ADAMS software carry out inverse kinematics co-simulation,achieving the purpose of mutual verification between the mathematical model and the virtual prototype.ADAMS software performs forward and inverse kinematics curve simulation,and obtains its virtual prototype pose animation and spiral motion trajectory.Finally,based on the Lagrange dynamics theory,the Lagrange dynamics mathematical model of the XY-3-RPS hybrid machine tool was established.Based on the calculated nozzle thrust,the ADAMS software was used to perform constant load and variable load on the basis of kinematics.Load dynamics simulation,get the relevant simulation mechanics curve,carry on the dynamic simulation without the restriction of freedom degree,verify the rationality of the constitutive design.