Core production sand and core production process thereof

Abstract

The invention relates to core production sand and a core production process of the core production sand. The core production sand comprises, phenolic rein-bonded sand, water and furan resin. The bending strength of the phenolic rein-bonded sand ranges from 4 MPa to 6 MPa, and the gas evolution is smaller than or equal to 15 ml / g, the weight of the phenolic rein-bonded sand is worked out accordingto the number of produced cores, the percentage of the water to the total weight of the phenolic resin sand is 0.7-0.8%, and the percentage of the furan resin to the total weight of the phenolic resinsand is 0.7-0.8%. The core production method comprises the steps that the prepared phenolic resin sand, water and furan resin are calculated according to the proportion and are sequentially added anduniformly mixed according to the requirements; and the uniformly-mixed core production sand is added into a molding cavity mold and formed and is put into a baking stove and baked according to the temperature and time requirements, and production is completed. The produced sand cores for casting are high in strength, small in gas evolution and good in collapsibility, and the profile quality of castings can be improved.

Description

Technical field [0001] The invention belongs to the field of iron mold-coated sand casting, and specifically relates to a core-making sand and a core-making process. Background technique [0002] As the country continues to deepen environmental protection, higher requirements are placed on the discharge of pollutants. Based on this, in order to get rid of the heavily polluted synthetic oil core sand, we have carried out research work on environmentally friendly core sand, and have achieved certain results. [0003] In the field of sand-coated casting of existing iron molds, a large number of casting cores are used in the production of iron molds or product classification. When the existing cores are made, the core-making sand used is a mixture of raw sand and fat oil. It is formulated. During the baking process after the core is formed, the synthetic fat oil will be transformed into polluted exhaust gas, which seriously pollutes the environment, and can no longer meet the existing...

AI Technical Summary

Problems solved by technology

[0003] In the field of iron mold sand-covered casting, whether it is iron mold production or product classification, a large number of casting cores are used. When the existing cores are made, the core sand used is a mixture of raw sand and synthetic grease. During the baking process after the core is formed, the synthetic grease will be transformed into polluting exhaust gas, seriously polluting the environment, and can no longer meet the existing environmental protection requirements; the core sand core made of synthetic grease and raw sand, In the process of use, it often causes casting appearance defects and poor surface quality