真空浸渗水玻璃对粘接剂喷射砂型性能的影响

doi:10.3901/JME.2023.10.056

摘要/Abstract

摘要： 粘接剂喷射增材制造工艺(3DP)具有成形效率高、成型件尺寸大、无残余热应力以及设备成本和维护成本低等优点,在砂型铸造方面拥有广阔的应用前景,然而3DP工艺难以兼顾砂型强度和发气量,制约其在高性能砂型铸造方面的应用。针对这一问题,提出水玻璃真空浸渗的后处理方法,通过系统研究了浸渗时间、浸渗浓度、后固化温度、后固化时间等因素对砂型强度和铸造发气量的影响规律,确定最佳浸渗工艺,并利用COMSOL数值模拟与微观组织分析进一步探究水玻璃浸渗对砂型性能的影响机理。研究结果表明,在经过浓度为100 wt%的水玻璃溶液浸渗20 h以及150℃后固化2.5 h后,砂型的抗拉强度可提升至5.07 MPa,发气量降至11.425 mL/g。这是因为在真空水玻璃浸渗过程中,水玻璃会附着在树脂粘接桥上或砂粒表面,填补砂粒之间的孔隙并且形成新的粘接桥,增加了粘接桥的数量,进而提高砂型的强度。

关键词: 粘接剂喷射成型, 砂型, 水玻璃, 真空浸渗, 抗拉强度, 发气量

Abstract: Binder jetting additive manufacturing process(3DP) has the advantages of high forming efficiency, large forming size, no residual thermal stress, low equipment cost and maintenance cost. It has a wide range of potential applications in sand casting. However, it is difficult to balance the tensile strength and gas evolution of sand mold in 3DP process, which limits its application in high-performance sand casting. A post-treatment method of sodium silicate impregnation is proposed. The effects of process parameters including impregnation time, impregnation solution concentration, post-curing temperature, post-curing time, etc. on the tensile strength and gas evolution of the mold are systematically investigated and the optimized impregnation process is determined. The influence mechanism of vacuum-impregnated sodium silicate on the properties of sand mold is explored through COMSOL software simulation and microstructure as well as morphology analysis. The results show that the tensile strength of the mold is increased to 5.07 MPa, and the gas emission is reduced to 11.425 mL/g after 20 h immersion of 100 wt% sodium silicate and 2.5 h curing at 150℃. This is because the sodium silicate can adhere to the resin bonding bridge or the surface of the sand particles and fill the pores between the sand particles to form new bonding bridges, leading the increase of the number of bonding bridges and the improvement of the strength of the sand mold during the impregnating process.

Key words: binder jetting, sand mold, sodium silicate, vacuum impregnation, tensile strength, gas evolution

中图分类号:

TG221

王富, 李成伟, 杨强, 崔晓涵, 李涤尘. 真空浸渗水玻璃对粘接剂喷射砂型性能的影响[J]. 机械工程学报, 2023, 59(10): 56-65.

WANG Fu, LI Chengwei, YANG Qiang, CUI Xiaohan, LI Dichen. Effect of Vacuum-impregnated Sodium Silicate on the Properties of Sand Mold Formed by Binder Jetting Process[J]. Journal of Mechanical Engineering, 2023, 59(10): 56-65.

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