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Furan Resin Sand Casting Process
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Self-hardening furan resin sand with furan resin as binder, and adding catalyst mixed sand, sand can be self-solidified at room temperature. Resin sand casting is better than clay sand casting molding, low rejection rate, high efficiency, reduce the labor intensity of workers and other advantages, is widely used in foundry casting. Mining machinery, agricultural machinery, water conservancy and hydropower machinery and other industries are suitable for resin sand casting.
Self-hardening furan resin sand has the following advantages:
1. Casting surface smooth, clear edges and corners, high dimensional accuracy.
This is because resin sand modeling can eliminate many factors that make the shape (core) deformation. Such as:
(1) The molding sand has good fluidity and does not need tamping machine to tighten, which reduces the damage and deformation of the shape (core box);
(2) After the sand mold (core) is solidified, the deformation caused by the loosening appearance before the mold and the damage of the sand mold (core) during the mold is reduced;
(3) no need to repair the type, reduce the deformation caused by the modification;
(4) without baking, reducing the deformation of the casting mold (core) caused by baking;
(5) The casting strength is high and the surface stability is good, so the gap of the core head is small and the negative number of the typing is small, which reduces the damage and deformation of the casting mold in the process of the core and die matching, and ensures the accuracy of the die matching;
(6) The casting mold (core) has high hardness and good thermal stability, which can effectively resist the phenomenon of mold wall retreat and migration during pouring, and reduce the thermal impact deformation of the casting mold (such as swelling sand, etc.);
(7) The collapse of molding sand is good, and it is easy to clean and polish, so as to reduce the damage to the casting shape accuracy in the dressing process of falling sand cleaning shovel. To sum up, since the factors affecting the deformation and damage of casting and casting are largely excluded in each process, the casting surface quality and geometric dimension accuracy of resin sand casting can be improved by 1-2 compared with clay drying sand, reaching CT7-9 accuracy and 1-2mm / 600mm flatness. The surface roughness is much improved. Increase by 20-50%.
2, high modeling efficiency, improve productivity and site utilization, shorten the production cycle.
Because of the good fluidity of molding sand, resin sand casting does not need tamping machine to tighten, saving a lot of tamping work, so that the molding operation is greatly simplified; The casting strength is high, saving the work of mold repair after the molding; Type (core) alcohol-based coating on the point dry can save the drying process, save time and site; Dry mechanical regeneration of old sand after recycling makes sand treatment a closed system, easy to mechanization, can save a lot of old sand treatment, sand mixing, transportation and other auxiliary labor; Molding sand has good collapsibility, easy falling sand, less dressing work; Save some preparation work before styling (core). Such as insert core solid. According to general statistics, the production efficiency can be increased by 40-100%, and the output per unit modeling area can be increased by 20-50% after replacing clay drying sand with self-hardening furan resin sand.
3, is conducive to mechanized production. Because molding sand is easy to compact, collapsible and easy to clean, the labor intensity of foundry workers is greatly reduced, which creates conditions for the realization of mechanized production in foundry. The working conditions and environment of foundry workers have been improved, such as the reduction of noise, silica dust and so on.
4, resin sand mold (core) high strength (including high temperature and high strength), good formability and gas evolution was lower than those of other organic casting, good thermal stability, good air permeability, can greatly reduce the adhering sand casting, sand inclusion, sand holes, blow hole, shrinkage cavity, the casting defects such as cracks, so as to reduce the rejection rate, can make clay sand to make complex parts, key-module.
5. Save resources. Because there is no need of drying kiln and hydraulic sand cleaning, the yield of molten iron is increased, and the consumption of compressed air is greatly reduced, so as to reduce the use of water, electricity and coal. And because the recycling and utilization of old sand is very easy, the recycling rate can reach 90-95%, so it has a significant effect in saving new sand, reducing transportation and preventing waste pollution.