Controlled Heat and Metal Transfer in Gas Metal Arc Welding-Base for New Rapid Prototyping Technique

熔化极气体保护焊中的受控热量和金属传递——新型快速原型技术的基础

• 批准号: 9732848
• 负责人: Radovan Kovacevic
• 金额: $ 21万
• 依托单位: Southern Methodist University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-15 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9732848&HistoricalAwards=false
• 关键词: Controlled; Heat; Metal; Transfer; Gas

9732848 Kovacevic As research into 3-D welding continues, the ability to produce fully dense, structurally strong metal parts directly from 3-D CAD data comes nearer to reality. This project will lay the foundation for developing a technique of controlling the dimensional accuracy of parts obtained by 3-D welding, one of the newest rapid prototyping methods. In 3-D welding, a droplet of the melted electrode wire is detached to form a metallic deposit. Rapid prototyping or rapid manufacturing may be accomplished by controlled deposition of the drops. A metallic part can be made layer by layer, with the drop size and detachment timing defining the resultant shape of the part, as well as its mechanical and metallurgical properties. The proposed system for rapid prototyping based on 3-D welding addresses the challenge of simultaneous geometric regulation of dimensional tolerances and mechanical and metallurgical properties of the part, by combined heat and mass transfer control. 3-D welding has the potential of offering numerous advantages over other rapid prototyping techniques. Final parts may be constructed with a large variation in dimensions and geometry by the introduction of robotic control of the welding torch. 3-D welding would allow the direct production of parts made of different materials. It is projected that the very low operating cost, the rapid processing time, and the control of properties makes 3-D welding unique among current rapid prototyping techniques. The combination of the theoretical and experimental approach will provide better understanding of the physics and the basis to optimize this innovative technique.

9732848 Kovacevic 随着 3-D 焊接研究的不断深入，直接从 3-D CAD 数据生产完全致密、结构坚固的金属零件的能力越来越接近现实。该项目将为开发一种控制 3D 焊接零件尺寸精度的技术奠定基础，3D 焊接是最新的快速原型制造方法之一。 在 3D 焊接中，熔化的焊丝熔滴分离形成金属沉积物。快速原型制作或快速制造可以通过液滴的受控沉积来完成。金属零件可以逐层制造，液滴尺寸和分离时间决定零件的最终形状及其机械和冶金性能。所提出的基于 3D 焊接的快速原型制作系统通过传热和传质组合控制，解决了零件尺寸公差以及机械和冶金性能同时几何调节的挑战。与其他快速原型技术相比，3D 焊接具有众多优势。通过引入焊枪的机器人控制，最终零件可以构造成尺寸和几何形状有很大变化的零件。 3D 焊接可以直接生产由不同材料制成的零件。据预测，极低的运营成本、快速的加工时间和性能控制使得 3D 焊接在当前的快速原型技术中独一无二。理论和实验方法的结合将提供对物理学的更好理解，并为优化这项创新技术奠定基础。