Research On Key Technologies Of Design-manufacturing Integration For FDM

With the continuous development of the research on add-on manufacturing technology,the forming accuracy and mechanical properties of the parts processed by it have been improved continuously.It also promotes the development of add-on manufacturing technology from model manufacturing for design verification to functional parts manufacturing for direct application.Compared with the traditional reduction manufacturing technology,the design method and system of the incremental manufacturing technology are not perfect,which can not meet the constraints of the optimal design and manufacturing of functional parts,thus limiting the application and development of the incremental manufacturing of functional parts.According to the development trend of engineering design and the digitalized processing characteristics of augmented material manufacturing,the research of DFM oriented to augmented material manufacturing technology is carried out in this paper.This paper analyses the characteristics of fused deposition technology(FDM),establishes the mapping relationship between the macro-geometric structure of the design model and the manufacturing process parameters and the forming quality,and establishes an integrated design and manufacturing method for the fused deposition technology.The macro-geometric structure and the mesoscopic cell filling are optimized by forward design,and the validity of the design method is verified by the specific processing part experiments.The details are as follows:(1)The characteristics of layered manufacturing and layer-by-layer accumulation of melt deposition forming technology are analyzed.Based on the theory of integration of design and manufacturing of traditional processing methods,an integrated method of design and manufacturing oriented to melt deposition is proposed.(2)From the point of view of forming technology,the effects of geometric structure and process parameters of the design model on the forming quality of the parts are analyzed,and the corresponding mathematical model is established.At the same time,the common cantilever structure and angular characteristics of the design model are theoretically analyzed and experimentally verified by orthogonal experiments(3)On the basis of the proposed design-manufacturing integration method,which does not affect the performance of functional parts,combined with the finite element method,the macro-geometric structure affecting the forming quality of parts is optimized.Taking the double smoke pipe rack as an example,the effectiveness of the design-manufacturing integration method in macro-structural optimization is verified by experiments(4)Establish a digital model of mesoscopic cell structure,analyze its mechanical properties by finite element method,and get the mechanical properties of mesoscopic cell structure.On the basis of the finite element analysis model of functional parts,complete the design filling of mesoscopic cell structure of functional parts,complete the mechanical testing of different cell types,and verify the integration method of design and manufacture for mesoscopic several.How to optimize the correctness.