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
Key words
alkaline phenolic resin sand/surface stability/powder modifier/room temperature strength
维普
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