摘要
采用多射流熔融增材制造技术制备了PA12试件,研究了PA12试件不同的构建取向对其成型精度和力学性能以及致密度的影响规律。结果表明,当位置尺寸为宽度方向时,尺寸精度总是呈正偏差,并且在不同得成型角度下,无明显变化规律,与宽度方向相比,厚度方向与长度方向尺寸精度随成型角度增加,变化规律较为明显;试件的力学性能与延伸率受成型角度影响规律相似,当成型角度从0°增加到45°时,试件拉伸强度与延伸率逐渐降低,在成型角度大于45°后,拉伸强度与延伸率显著提升;致密度变化趋势与力学性能保持一致;综合分析可得,当成型角度为45°时,试件的尺寸精度达到最佳水平;最佳力学性能成型角度为0°,此时PA12试件的平均拉伸强度为50.95 N/mm^(2),平均延伸率为37.02%;致密度最高成型角度为0°,平均致密度可达到99.311%。
PA12 parts were prepared using a multi-jet-fusion(MJF)3D printing technology,and the effect of construction orientation on the forming accuracy and mechanical properties of PA12 parts were investigated. The results indicated that the size accuracy was always positive deviation when the position size was the width direction. There is no obvious change law at different forming angles. Compared to the width direction,the size accuracy in thickness direction and the length direction increased with the forming angle,indicating a more obvious change law. The mechanical properties of parts presented a similar influence of forming angle with the elongation rate. When the forming angle increased from 0 °to 45 °,the tensile strength and elongation rate of parts gradually decreased. The tensile strength and elongation rate increased significantly after the forming angle was greater than 45 °. The trend in the induced density change was consistent with the mechanical properties. According to comprehensive analysis,the size accuracy of the parts reaches an optimal level when the molding angle was 45 °. The forming direction for optimal mechanical performance was parallel to the x-y plane direction. Under this condition,the PA12 parts obtain average tensile strength of 50. 95 N/mm^(2),average elongation of 37. 02 %,a forming angle of 0 ° for the highest density,and an average density of 99. 311 %. The MJF technology was more efficient compared to the traditional 3D printing technology. This study offers a theoretical and experimental foundation for the mass production of high-performance and high-precision nylon parts.
作者
王金业
唐博虎
杨立宁
谢猛
郭泽朝
杨光
WANG Jinye;TANG Bohu;YANG Lining;XIE Meng;GUO Zechao;YANG Guang(Hebei University of Science and Technology,Shijiazhuang 050018,China;Hebei University of Science and Technology,Shijiazhuang 050000,China;Yantai Jereh Oilfield Services Group Co,Ltd,Yantai 264003,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2022年第6期81-86,共6页
China Plastics
基金
河北省省级科技计划(206Z1806G)
河北省高校百名优秀创新人才支持计划(SLRC2019050)。
关键词
增材制造
多射流熔融
聚酰胺12
尺寸精度
力学性能
additive manufacturing
multi-jet melting
polyamide 12
dimensional accuracy
mechanical property
