Abstract The continuous discovery of new materials and methods has brought about a lot of change in the foundry industry. For instance, the emerging of the Furan No Bake process has gradually not only become the principal method for large-sized castings, but also been accepted extensively in the foundry industry with its characteristics of convenience and cleanliness. In the purposes of finding out the best combination of new sand and reclamation sand, and then reaching the demand of the most economical making process and the best quality for casting, this experiment has attempted to discuss some property changes of Furan No Bake process, such as the influence of mold hardn- Ess, dry compression, dry shear, surface stability, permeability , grainfineness, LOI and so on. Furthermore, by using the ladder molding, pouring gray cast iron and nodular graphite cast iron, the surface quality of casting and micrograph in ladders have been analyzed. Also, with different cooling temperatures being put on ladders, we could acquire the needed information about hardness. The conclusions of the experiment are as follows: The kind of Furan sand uses 100% new sand, 50% new sand plus 50% reclamation sand, 50% reclamation sand. Furan resin uses 0.5%, 1.0%, 1.5% in FNB process, and the time to hardness is set to 60 mins. Uses 1.5% Furan resin. The 100% new sand is the best for hardness, surface stability and permeability, when 1.5% Furan resin is used getting the larger hardness 70. when 1.5% Furan resin is used getting the smaller surface stability 6.54%, when 0.5% Furan resin is used getting the best permeability is 719. When 1.5% Furan resin is used, getting large dry compr- ession of 50% new sand plus 50% reclamation sand. The value is 1.28Mpa. Because the 100% reclamation sand remains the fronter hardness surface, in 60% furan resin, the value of the grain finess is 15.73. The largest value of the L.O.I. is 1.3%, and of the shear is 0.224MPa. The surface quality of casting is best with the combination of 50% new sand, 50% reclamation sand and 1.5% of the furn binder, along with being pouring from the thin ladders. Pouring height uses above 30cm location with many gas holes on the surface. The micrograph of gray cast iron turns out to type C graphite, and type B graphite in thick ladders and thin ones, respectively. The graphite diverges are evenly from the thick ladders and the thin ones’ micrograph are dendrite. The nodularity rating and the nodule count of nodular graphite cast iron are represented in the thin ladders, whcih are higher than those are visible in the thick ones.The micrograph in the thin ladders contains much more Pearlite as well. The hardness of the thin ladders casting is larger than thick ones. The Brinell Hardness Number for thick ladders of gray cast iron is HB105 in average; whereas for thin ladders is HB108 in average. The hardness for thick of nodular graphite cast iron is HB81 in average; whereas for thin is HB87 in average. The Brinell Hardness Number for gray cast iron at thicker side of ladders is larger, HB107.in average.The hardness for gray cast iron, the thinner side is larger on reversed side, HB109 in average. The Brinell Hardness Number for nodular graphite cast iron, reversed side is larger, HB82 in average.The hardness for nodular graphite cast iron, reversed side is larger, HB88 in average.
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