水溶性芯模在VARI成型工艺中的应用研究

制备了一种低成本易成型的水溶性芯模,对其成型收缩率、压缩性能、水溶性及气密性进行了研究,结果表明采用石英砂制备的可溶性芯模成型前后具有良好的尺寸稳定性,在室温至120℃区间内压缩强度均高于3 MPa,浸泡在常温水溶液中1 min内能够快速溃散至砂粒状态,经表面封孔处理后能够达到VARI成型工艺对模具的气密性要求。通过在填充可溶性芯模的中空金属框表面进行VARI工艺验证试验,表明制备的水溶性芯模能够作为VARI工艺模具使用,且脱模简单方便,对制品表观质量基本没有影响,具有良好的应用前景。

THE RESEARCH OF WATER SOLUBLE CORE USED IN VARI MOLDING PROCESS

In this paper,a low-cost,easy-to-form water-soluble core mold was prepared and its shrinkage,compression property,water solubility and air tightness were studied.The results show that the soluble core mold prepared by quartz sand has good dimensional stability before and after molding,the compressive strength was higher than 3 MPa at room temperature to 120 ℃ and it could be quickly collapsed into the sand condition within 1 min at room temperature.The airtightness of the mold which should satisty vacuum assisted resin infusion (VARI) molding process was achieved after surface sealing treatment.The VARI process validation test was carried out on the surface of the hollow metal frame filled with water-soluble core mold.It shows that the water-soluble core mold prepared in this paper can be used as a VARI process mold which has little effect on the apparent quality of the product.The mold release is simple and convenient,and the core mold has a good application prospects.