{"title":"Computational and Laboratory Analysis of Thermal Free-Form Fabrication of Metal Prototypes","authors":"C. Doumanidis, N. Fourligkas","doi":"10.1115/imece1996-0155","DOIUrl":null,"url":null,"abstract":"The advent of rapid prototyping methods for functional layered metal products has created the need for thermal off-line analysis and optimization of the process conditions, as well as for real-time control of the material structure and properties through the temperature field. For this purpose, this work introduces a scanned thermal processing technique, in which the heat source rapidly sweeps the surface of each deposited layer to ensure a flexible heat input distribution. For this method, the article establishes two dynamic thermal modeling tools: a finite-difference numerical simulation of the temperature field in layered objects, and an experimental linearized formulation with time-varying parameters identifiable in-process by thermal measurements. The models are applied and validated in elementary LOM thermal operations on a plasma-arc processing station with infrared thermal sensing and computer control, and their use for design of a closed-loop thermal regulator is discussed, together with the metal structure and properties of scanned parts.","PeriodicalId":407468,"journal":{"name":"Recent Advances in Solids/Structures and Application of Metallic Materials","volume":"375 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1996-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Recent Advances in Solids/Structures and Application of Metallic Materials","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1115/imece1996-0155","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The advent of rapid prototyping methods for functional layered metal products has created the need for thermal off-line analysis and optimization of the process conditions, as well as for real-time control of the material structure and properties through the temperature field. For this purpose, this work introduces a scanned thermal processing technique, in which the heat source rapidly sweeps the surface of each deposited layer to ensure a flexible heat input distribution. For this method, the article establishes two dynamic thermal modeling tools: a finite-difference numerical simulation of the temperature field in layered objects, and an experimental linearized formulation with time-varying parameters identifiable in-process by thermal measurements. The models are applied and validated in elementary LOM thermal operations on a plasma-arc processing station with infrared thermal sensing and computer control, and their use for design of a closed-loop thermal regulator is discussed, together with the metal structure and properties of scanned parts.