摘要
3D打印技术(3DP)适合复杂砂型的低成本快速制造,但因其逐层将松散粉末粘结的特殊成形原理,导致砂型孔隙率高、强度低,进而影响铸件的合格率。针对此问题,研究了酚醛树脂含量和热处理温度对抗拉强度的影响。采用无水乙醇、聚乙二醇-400、去离子水组成的粘结剂(质量比为86∶9∶5),打印成形不同酚醛树脂含量的覆膜砂型,并加热至不同温度进行固化。结果发现,随酚醛树脂含量和热处理温度提高,砂型抗拉强度逐渐增大,在树脂含量为3.5%时,经175℃×2h固化处理后,砂型强度为4.238MPa。
Three-dimensional jet printing technology(3DP)is suitable for low-cost and rapid manufacturing of complex sand molds.However,due to its special forming principle of bonding loose powder layer by layer,the sand mold has high porosity and low strength,which affects the qualification rate of castings.Aming to this problem,the effects of phenolic resin content and heat treatment temperature on the tensile strength of the sand mold were investigated.Adhesive which is composed of absolute ethanol,polyethylene glycol-400and deionized water(mass ratio is 86∶9∶5)was used to spray-print the coated sand with different phenolic resin content and at different heating temperatures.The results reveal that with the increase of phenolic resin content and heat treatment temperature,the tensile strength of the sand mold is gradually increased.At a resin content of 3.5%and treatment of 175℃×2h,the strength of the sand mold reaches the maximum volue,which are 4.238MPa.
作者
陈志平
叶福源
Chen Zhiping;Ye Fuyuan(Guangdong Kelon Mould Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第12期1380-1384,共5页
Special Casting & Nonferrous Alloys
基金
广东省科技计划资助项目(2017B090911007)。
关键词
三维喷印成形
覆膜砂
酚醛树脂
热处理
抗拉强度
Three-dimensional Printing
Coated Sand
Phenolic Resin
Heat Treatment
Tensile Strength
