Combined Machining Of Polyetheretherketone Materials By 3D Printing And Milling

Nowadays,with the continuous emergence of bone damage and the increasingly aging population,it is especially important to develop bio-mimetic artificial bone with good structure and biocompatibility.Among them,the thermoplastic engineering plastic poly-ether-ether-ketone(PEEK)is currently recognized as an ideal artificial bone substitute material.Among the many methods for preparing thermoplastic plastic artificial bones,Fused Deposition Modeling(FDM)is a relatively mature one in 3D printing technology.However,due to the limitations of the technical processing principle,the surface quality of the 3D printed products is poor,and the reduction processing such as milling is the simplest and most effective way to improve the surface quality of the printed work-piece.In view of this,this paper combines additive manufacturing technology with reduced material manufacturing technology,and uses composite processing technology to produce artificial bone.The FDM-3D printing process parameters and milling parameters of PEEK are tested experimentally.In the domestic research on the 3D printing process parameters of PEEK materials,the mechanical properties of 3D printing specimens for PEEK materials are less studied.Therefore,the storage modulus of printed specimens is selected in the 3D printing experiment.The other two subjects were selected for printing time and printing material consumption.The layer thickness,internal packing density,and peripheral printing profile were used as the research parameters.The milling test was carried out on the plane of the 3D printed test piece,and the surface roughness was selected as the research object.The cutting depth,the spindle speed,and the feed per tooth were taken as the research parameters.The regression results mathematical model of FDM type 3D printing and milling process parameters were established by the test results.The influence of the interaction between each parameter on the research object was analyzed,and the process parameters were optimized accordingly.The optimal parameter combination of the 3D printing process is as follows: the layer thickness is 0.43 mm,the internal packing density is 55.05%,and the outer contour is 1.39 circles.The optimal combination of milling parameters is: the cutting depth is 0.2mm,the spindle speed is 3500r/min,and the feed per tooth is 0.06mm/z.Considering the fact that the surface of human bone is mostly curved,the surface milling test of PEEK 3D printing specimens is carried out by single factor and multi-factor orthogonal optimization experiments.The influence of cutting depth,spindle speed and feed per tooth on s urface roughness was studied.The test results show that the factors affecting the surface roughness from severe to minor are the spindle speed,the cutting depth and the feed per tooth.When the spindle speed is 4700r/min,the cutting depth is 0.40 mm,and the feed per tooth is 0.085mm/z,the surface roughness is minimal.