Application of Basic Phenolic Resin Sand in Foundry Production
Release time:
2022-03-03 09:31
This paper puts forward some reference suggestions from the process characteristics of basic phenolic resin sand, the characteristics of basic phenolic resin, the problems encountered in foundry production, the solutions, and the use of new technologies.
Process characteristics of basic phenolic resin sand
1. basic phenolic resin not contain harmful elements such as N, P, and S, and will not cause defects caused by infiltration of N, P, and S. It can be used in various alloy castings, especially alloy steel castings and ductile iron castings.
2. basic phenolic resin no-bake sand process is developed by Bordon Company, UK, and the curing agent used is organic ester instead of organic acid. Alkaline phenolic resin no-bake sand has incomplete hardening. In the initial stage of casting, the mold and core sand first show short-term heat shrinkage, and then the secondary hardening becomes rigid until collapse. This feature can significantly reduce the tendency of hot cracking of castings, reduce the casting sand flushing defects of castings, and help improve the dimensional accuracy of castings.
3. basic phenolic resin self-hardening sand, the fume emitted during sand mixing, molding and pouring is less than furan resin self-hardening sand with acid as curing agent, resole phenolic resin no-bake sand with acid as curing agent and Urethane resin no-bake sand with amine as curing agent.
4.Basic phenolic resin self-hardening sand is a typical "gradually hardening" self-hardening sand. The reaction process takes tens of minutes to ten hours to complete. Usually, the 24-hour sample strength is used as the final strength.
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