Research On The Additive-Subtractive Hybrid Manufacturing Process Of Functionally Graded Materials

In response to the technical requirements of aerospace,automotive and mold industries with more and more complex structures and shapes,and more and more difficult materials to process,the additive manufacturing+milling processing(subtractive manufacturing)composite processing solution for adding and reducing materials has emerged as the times require.The additive manufacturing technology integrates organically both additive manufacturing and subtractive manufacturing,so that it not only combines the advantages of additive manufacturing and subtractive manufacturing but also makes up for each other’s shortcomings.For the processing of various complex parts with greater flexibility,it can realize the forming,manufacturing,repairing,and spraying of complex metal parts.At the same time,the laser coaxial powder feeding additive method also makes it possible to manufacture multi-material composite functionally graded materials.A series of new lightweight aerospace parts for extreme environments such as ultra-high temperature,ultra-low temperature,and ultra-high pressure has been designed for the application of multi-disciplinary structure/material integrated topology optimization research in aerospace and other fields.Different parts of the same part require different performance.Traditional processing methods are difficult to meet the requirements of various aspects of materials and performance.The manufacturing requirements of parts with functionally graded material characteristics need to be solved urgently.The process realization of new lightweight aerospace parts and the test and verification of manufacturing simulation parts are also of great significance.Oriented to structural topology optimization and material topology optimization component manufacturing requirements,this paper explores the structure of the key parts of aero-engines and multi-material laser manufacturing process planning technology and carries out experimental verification of the processing technology of turbine disk experimental simulation parts.The main research contents of this paper are as follows:(1)Carry out basic process parameter experiments of additive manufacturing,and conduct a series of composite materials,functionally graded material preparation processes and various performance parameters for SS316L/IN625,GH4169/K418B alloys.Explore the feasibility of additive-subtractive composite manufacturing process for complex parts and functionally graded material parts;(2)Study the additive-subtractive composite manufacturing technology of complex free-form surface parts and functionally gradient material parts.For hollow turbine disks,carry out additive process experiments of different metal materials and functionally gradient materials to clarify the law of forming performance;(3)Carry out research on the optimal efficiency process path planning for the increase and decrease of materials for complex structural parts,optimize the increase and decrease of composite manufacturing process parameters.On the basis of additive-subtractive composite manufacturing technology,propose a technical route combining laser selective melting with additive-subtractive composite manufacturing based on coaxial powder feeding.Explore the process feasibility of multi-material/structure integrated topology optimization simulation preliminarily.