Research On Combined Machining By Fused Deposition Modeling And Milling Processes

Nowadays,with the continuous advancements and developments of science and technology,3D printing is used more and more widely in the fields of aviation,medical care and daily life.Meanwhile,the quality requirements of 3D printing products have become higher and higher.Combined machining technology by additive manufacturing and cutting can realize the precision machining for three-dimensional complex geometrical features.The machine tool possessing the advanced combined machining technology is the key to conduct studies on this field.Therefore,this project has conducted studies for the overall structure design and construction of the machine tool which has the combined machining techniques by fused deposition modeling and milling processes.Furthermore,the experimental studies have been conducted for the technologies of combined machining by fused deposition modeling and milling processes.The main research contents are as follows.Firstly,the basic technical parameters are confirmed for the combined machine tool of fused deposition modeling and milling processes.The overall design plan is formulated based on the traditional design concept of machine tools and the feasibility of practical operations.The standard parts are selected and verified for the machine tool.Secondly,three-dimensional software is used to model the combined machine tool with 3D printing and milling functions.The finite element software ABAQUS is used to conduct the static analyses for the whole machine tool and key parts.The design schemes are optimized and the combined machine tool is constructed.Then,the optimization experiments of 3D printing parameters for the material PLA have been conducted.Based on the studies of single-factor experiments and orthogonal experiments and the analyses of the experimental results,it shows the optimal printing parameters are that layer thickness is 0.3mm,printing speed is 20mm/s and the 3D printing temperature is 200?.The designed machine tool has been verified by the results.Finally,aiming at the material PEEK,which has higher softening point temperature,the experimental studies have conducted for combined 3D printing and milling.The experimental results are analyzed synthetically.The optimized 3D printing parameters are that the layer thickness is 0.3mm,printing speed is 15mm/s and the temperature is 360?.By selecting the reasonable milling parameters as the milling speed of 50mm/s,the feed of 0.4mm/r,and the milling depth of 2mm,the finial part with the dimensional error of 0.34% and the surface finish of Ra1.675 ? m has been achieved.The high-efficiency and high-precision combined machining of the material PEEK has been realized.This study has provided a certain references and research bases for the combined machining of customized artificial bones made of the material PEEK by fused deposition modeling and milling processes.