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

9732848 Kovacevic 随着对3D焊接的研究不断深入，直接从3D 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。本研究将为开发一种控制三维焊接零件尺寸精度的技术奠定基础，三维焊接是最新的快速成型方法之一。 在3-D焊接中，熔化的电极丝的液滴被分离以形成金属存款。可以通过液滴的受控沉积来实现快速原型或快速制造。金属零件可以逐层制造，其中液滴尺寸和分离时间限定了零件的最终形状，以及其机械和冶金性能。所提出的基于3-D焊接的快速成型系统解决了同时几何调节的尺寸公差和机械和冶金性能的部分，通过组合的热量和质量传递控制的挑战。3D焊接有可能提供比其他快速成型技术更多的优势。通过引入焊枪的机器人控制，最终零件的尺寸和几何形状可以有很大的变化。3D焊接将允许直接生产由不同材料制成的零件。据预测，非常低的运营成本，快速的处理时间，和控制的性能，使3-D焊接独特的快速成型技术。理论和实验方法的结合将提供对物理学的更好理解和优化这种创新技术的基础。

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.