| With the development of digital design technology and materials science and technology,3 d printing technology is widely used in various fields step by step,FDM fused deposition modeling technology as one of the main 3 d printing molding process,the first to be used for industrial products manufacturing,and trial production of new product development and debug and handicraft manufacturing and other fields,its fast implementation test and modification of the new product trial production,greatly save the product development time,reducing the development costs of new products.At present,due to the influence of material properties,except for some plastic parts,the mechanical properties of FDM molding parts cannot completely replace those of traditional products.Users do not have high requirements on their mechanical properties,but the requirements of molding precision on product quality are widely valued by users.At present,many people have done a lot of research on its forming precision,but have not found a stable process reference scheme that can be widely used in various fields.Therefore,how to obtain a stable process scheme is one of the key technologies to realize "3D rapid manufacturing" in 3D printing molding process.Theoretical study on the influence of main process parameters on the surface roughness and dimensional precision of the parts.The main process parameters affecting the roughness and dimensional accuracy were determined by the empirical method and the experimental method,including the layer thickness,scanning speed,printing temperature and filling rate.In this paper,the parameters such as layer thickness,scanning speed,printing temperature and filling rate are selected to study the surface roughness and dimensional accuracy of the parts.According to the staircase effect in forming process,using the outline of the arithmetic average deviation as evaluation index,the surface roughness of FDM molding surface ladder error is derived for the mathematical expressions of surface roughness to map the forming Angle-von berg systeme surface roughness,the thick-as the curve of surface roughness,and analyses the influence of single factor the influence law of surface roughness,and through experiment verify its rationality.The whole process of FDM molding is systematically analyzed.Starting from the molding principle,the difference between the real silk width of the molding wire and the track width of the data model is explored,and the cross section model of the silk width compensated by the variation error is proposed and constructed.Structure from ideal situation,the analysis of the silk wide influence on forming precision,through experiment verify its rationality,and on this basis,considering its with silk material in the process of forming shrinkage deformation of the cross influence,change the mathematical model of error compensation is put forward,research the Angle of different forming the influence law of dimensional precision,more for subsequent provides the theory basis for the optimization of process parameters;Experimental study on the influence of main process parameters on the forming precision of FDM.Select layer thickness,scanning speed,print,main process parameters such as temperature,filling rate as a control factor,on the basis of the theory of taguchi experiment research,the poor,variance and regression analysis of a single size,single target size were obtained,the best process parameter combination and degree of significant impact factor,and a single size error of the regression equation is deduced,through the comparison of the predicted values and the real value analysis verify its rationality;Study and planning of three dimensional experiments based on grey taguchi method.For horizontal linear size,the size of the vertical linear and circular arc dimension grey correlation degree analysis,and the grey relational grades mean value,variance and regression analysis,to get more target under the optimum technological parameters combination and influencing factors of significant degree,the S/N ratio gray regression equation is derived,through the comparative analysis to verify its rationality,for follow-up study and put forward a set of process parameters based on optimization of molding process parameters combination;Application research of multi-process parameter optimization in FDM molding process.For a company under the new design of motorcycle plug technology analysis,combined with the research under the theory of plug parts of FDM molding process planning and process,from the cost of forming precision,forming and molding efficiency in the face of the optimized combination of process parameters and recommend the analysis parameters of molding parts,using FDM technology and planning to sample trial production,improve the dimension precision of the parts and greatly reduces the manufacturing cost.Dimensional accuracy increased by 26-50%,piece of tooling cost for the original manufacturing cost 0.03 0.07%,single processing time is only the original 33.3 44.5%,think in terms of overall cycle,product debugging stage appears unavoidably again and again modification and manufacture process,sample number two,this kind of new product development cycles are usually in 6-8 days,while using FDM molding technology and plan put forward by the author to plug samples under trial production,the development cycle in just 3.5 days,cycle is only 43.8 to 58.3%. |
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