3D打印呋喃树脂砂型收缩性能研究

Study on Shrinkage of Furan Resin Sand Mold by 3D Printing

随着铸造数字化技术的发展,砂型3D打印技术应用越来越广泛。由于呋喃树脂在固化反应时会发生体积收缩,所以打印砂型的尺寸收缩也是影响砂型精度的重要因素之一。研究了呋喃树脂喷墨打印工艺参数对砂型收缩性能的影响,结果表明:在3.03%~3.98%树脂加入量、0.3%~0.5%固化剂含量、70/140、100/200、140/270型砂目数条件下,打印砂型的收缩率与树脂加入量关系甚微,主要随着固化剂含量的增加而变大,随着型砂目数的增加而变小。3D打印砂型的尺寸收缩是呋喃树脂固化反应体积收缩的结果。

With the advancement of digital casting technology,sand mold 3D printing has become increasingly popular.Because the furan resin shrinks in volume during the curing process,the size shrinkage of the printing sand mold is also one of the important factors affecting the accuracy of the printing sand mold.The influence of furan resin inkjet printing process parameters on the shrinkage performance of sand molds was studied in this research,and the results showed that at 3.03%-3.98%resin addition,0.3%-0.5%curing agent content,70/140,100/200,140/270 mesh number of the molding sand,the shrinkage rate of the printing sand mold had minimal relationship with the quantity of resin supplied,which largely increased with the increase of the curing agent content and reduced with the increase of the molding sand mesh.The dimensional shrinkage of the 3D printing sand mold was the result of the volume shrinkage of the furan resin curing reaction.