Research On Life Cycle Assessment Of Hydraulic Manifold Fabricated Using Additive Manufacturing

Life Cycle Assessment(LCA)is a quantitative analysis of the resources,energy consumption,and pollution emissions involved in the entire life cycle of the product.Through obtaining the size of its impact on the environment and diagnosing prominent problems,LCA can find countermeasures and then achieve energy conservation,consumption reduction,and emission reduction.The strong ability to form complex structures and a large degree of design freedom of metal additive manufacturing technology make it a new way to achieve product lightweight and improve environmental performance.However,the environmental impact of additive manufactured products on the whole life cycle has not been studied,especially compared to traditional manufacturing.There is no accurate data to prove the advantages of metal additive manufacturing.Therefore,the thesis will take this as the goal of establishing a LCA model for additive manufacturing products and selecting the hydraulic manifold that generates a lot of energy consumption due to the large proportion of volume and weight as the evaluation object,then diagnose the key problems in its life cycle,thus put forward suggestions for environmental improvement.After comparing the evaluation results with traditional manufacturing hydraulic manifold,the specific advantages of additive manufacturing technology can be grasped.The main contents of the thesis are as follows.The first chapter introduces the theoretical framework of LCA,the current research status of the environmental impact of additive manufacturing products at home and abroad,the current status of cost research,and the development status of LCA tools and summarizes the problems to be studied in depth.The second chapter identifies the research objectives and system boundaries and divides the research scope of "cradle to cradle" into five stages: raw material production,product production,product use,product transportation,and product recycling.Then,the selection method of the data source is discussed and a general inventory data selection criterion is proposed.After the list collection steps of each unit process in the life cycle are described in detail,the list model is established.Then the technical steps of Life Cycle Impact Assessment in order of impact classification,characterization,and quantification are introduced.We determine the model Re Ci Pe as the method of impact evaluation.Finally,we achieve the LCA modeling of the additive manufacturing products.The third chapter identifies the hydraulic manifold as the object of environmental impact evaluation.Using the list model,the complete inventory data is collected and the inventory database is established.Based on the LCA model of the additive manufactured product,the LCA application is developed.After using the application,the environmental impact assessment of the hydraulic manifold is carried out.Thus,the results of its 18 Midpoint damage types and 3Endpoint damage categories are obtained.The fourth chapter carries out the product life cycle contribution analysis for the environmental impact results obtained,and the results show that: Firstly,the application scenario will greatly affect the selection and optimization direction of the product manufacturing method.Secondly,the stages of product use,product production,and raw material production have the greatest impact.Thirdly,Gas atomization,steel production,and SLM are the unit processes that need to be paid attention to.Then,the sensitivity analysis of the key indicators of the key process is analyzed.The results show that the three indicators of the degree of the hydraulic manifold lightweight,the pressure loss of the hydraulic manifold,and the amount of liquid nitrogen used in the gas atomization process have the greatest effect on the results of the environmental impact.According to the results,the improvement suggestions for the environmental impact of the hydraulic manifold design stage and the life cycle stage are given.The fifth chapter summarizes all the research results and puts forward suggestions for future research directions.