碱性酚醛树脂砂表面安定性的试验研究  

Study on Surface Stability of Alkaline Phenolic Resin Sand

作　　者：王才加尚 彭昕[1] 张宇[1] 殷亚军[1] 计效园[1] 李远才[1] 周建新[1] WANG Cai-jia-shang;PENG Xing;ZHANG YU;YIN Ya-jun;JI Xiao-yuan;LI Yuan-cai;ZHOU Jian-xin(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]华中科技大学材料成形与模具技术全国重点实验室,湖北武汉430074

出　　处：《铸造》2024年第11期1561-1568,共8页Foundry

基　　金：国家重点研发计划项目(2022YFB3706800)。

摘　　要：碱性酚醛树脂砂作为一种环保型树脂砂,在铸钢件生产上得到了广泛应用,但存在表面安定性差的问题,容易导致生产的铸钢件易发生夹砂和粘砂缺陷。为此,首先以碱性酚醛树脂砂为主要研究对象,确定达到实际生产需求的表面安定性为99%,其次筛选碱性酚醛树脂和粉末添加剂,选用了两种粉末添加剂,进行正交试验后得到的最佳工艺方案为:树脂加入量1.2%,原砂采用大林砂40/70号,氧化镁0.1%,可溶性淀粉0.1%。结果表明,相较于优化前,优化后的方案1 h强度提高至0.55 MPa,24 h强度提高至0.93 MPa,表面安定性提高至99.12%,最后进行浇注验证,与优化前相比,优化后的造型方案生产的铸钢件表面质量较好,无夹砂和粘砂缺陷。Alkaline phenolic resin sand,as an environmentally friendly resin sand,has been widely used in the production of steel castings.However,there is a problem of poor surface stability,which leads to sand inclusion and sand sticking defects in steel castings.In this paper,the surface stability standard detection method of self-hardening sand is used,and the alkaline phenolic resin sand is taken as the main research object.Firstly,the surface stability requirement that meets the actual production demand is 99%.Secondly,the alkaline phenolic resin and powder additives are screened,and two kinds of powder additives are selected.The optimum process scheme obtained after orthogonal optimization experiment is as follows:resin addition amount is 1.2%,raw sand is Dalin sand 40/70,magnesium oxide 0.1%,soluble starch 0.1%.The results show that the optimized scheme 1 h strength is increased to 0.55 MPa compared with that before optimization.The 24 h strength is increased to 0.93 MPa,and the surface stability is increased to 99.12%.The surface quality of the cast steel is better,and the sand inclusion and burning-on defects are less.

关 键 词：碱性酚醛树脂砂 表面安定性 粉末改性剂 常温强度 

分 类 号：X705[环境科学与工程—环境工程]