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首页> 外文期刊>Journal of Manufacturing Processes >Developing thixo-extrusion process for additive manufacturing of metals in semi-solid state
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Developing thixo-extrusion process for additive manufacturing of metals in semi-solid state

机译：开发触变挤压工艺，用于半固态金属的增材制造

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This paper deals with a comprehensive study of the semi-solid metal extrusion and deposition (SSMED) process and influencing parameters. This process could be considered as a non-powder based metal Additive Manufacturing (AM) method. Unlike the common methods of metal AM, it utilizes the extrusion of a metallic filament in a semi-solid state (thixo-extrusion) to build the final product from a CAD file in a layer-wise fashion. A continuous wire thixo-extruder was designed and mounted on a 3 axis table to deposit semi-solid slurry layer by layer. This work seeks to provide a better understanding of the impact of the principle process variables on the quality of this layer-wise freeform fabrication method. The process parameters related to the production and pre-treatment of the metallic filament, its thixo-extrusion, rheological and microstructural aspects are included in this study. The results show that wire pre-treatment process variables have strong effect on the globular microstructure of metallic filament and this in turn has great role in the alloy's thixo-extrudability. Proper design of a thixo-extruder and selecting accurate values for the influencing parameters is the key to a successful production. The quality of the fabricated part was influenced by several factors such as microstructural, geometrical and run time parameters. Semi-solid alloy's solid fraction was the most influential factor in the thixo-extrusion process. Alloys with solid fraction values in the range of 0.3-0.6 could be thixo-extruded. It was found that temperature distribution and feed rate had a great effect on the process performance. Also design guidelines for selecting the appropriate thixo-extrusion properties were presented for different operating conditions.
机译：本文对半固态金属挤压和沉积（SSMED）工艺及其影响参数进行了全面的研究。该过程可以被视为非粉末金属增材制造（AM）方法。与金属AM的常规方法不同，它利用半固态金属丝的挤出（触变挤出）以分层的方式从CAD文件生成最终产品。设计连续丝触变挤出机并将其安装在3轴工作台上，以逐层沉积半固体浆料。这项工作旨在更好地理解主要工艺变量对这种分层自由形式制造方法的质量的影响。与金属丝的生产和预处理，触变性，流变和微观结构有关的工艺参数都包括在本研究中。结果表明，线材的预处理工艺变量对金属丝的球状微观结构有很大影响，这反过来又对合金的触变性具有重要作用。触变性挤出机的正确设计和影响参数的准确选择值是成功生产的关键。制造零件的质量受多个因素的影响，例如微观结构，几何形状和运行时间参数。半固态合金的固相率是触变挤压过程中影响最大的因素。固形分数值在0.3-0.6范围内的合金可以进行触变性挤出。发现温度分布和进料速率对工艺性能有很大影响。还针对不同的操作条件提供了选择合适的触变挤出性能的设计指南。

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