金属材料挤出（Metal Material Extrusion，简称 MME）技术因其生产成本低、材料利率高、设计自由度高、环境友好等特点，在工业设计、医疗器械等领域有着巨大的发展潜力和优势。但是由于逐层累加的制造方式，导致MME产品的机械性能逊色于传统减材方式加工的金属产品。为了提高MME产品的机械性能，提出振动辅助加工的方法，即利用压电陶瓷的逆压电效应将振动引入生坯成型过程，并分别制备了振动辅助与否的拉伸和弯曲生坯试件，再经脱脂-烧结处理形成致密化的纯金属试件；随后分别对生坯和烧结试件进行了静力学试验，并对比分析了振动辅助成型与否的试件的抗拉强度、抗弯强度及应变等参数。研究结果表明，振动辅助加工可以显著提高MME生坯和烧结试件的抗拉和抗弯强度，并有效降低其拉伸和弯曲的正交各向异性特征。
Abstract
Metal Material Extrusion(MME) has great potential and advantages in industrial design, medical devices and other fields, which is attributed to the advantages of this technology such as low production costs, high material rates, high design adaptability and environmental friendliness. However, due to the layer-by-layer cumulative manufacturing method, the mechanical properties of MME products are inferior to those of metal products processed by traditional subtractive manufacturing. In order to improve the mechanical properties of MME products, a vibration-assisted processing method was proposed, i.e., the inverse piezoelectric effect of piezoelectric ceramics was utilized to introduce vibration into the green part process, and tensile and bending green parts with or without vibration-assisted were respectively prepared, and then the densified pure metal parts were formed by debinding and sintering process; subsequently, static testing was carried out respectively on the green and sintered parts, and the tensile strength, bending strength and strain of the parts with or without vibration assisted molding were compared and analyzed. The results show that vibration-assisted processing can significantly improve the tensile and bending strength of MME green and sintered parts, and effectively reduce the orthogonal anisotropy characteristics of their tensile and bending properties.
关键词
金属材料挤出 /
振动辅助加工 /
抗拉强度 /
抗弯强度 /
正交各向异性
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Key words
metal material extrusion /
vibration assisted machining /
tensile strength /
bending strength /
orthogonal anisotropy
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参考文献
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