Preparation process of furan resin sand

Abstract

The invention provides a preparation process of furan resin sand, and the preparation process comprises the following steps: 1) dividing original sand into two parts by weight, adding one part of the original sand into a continuous-type sand mixer, adding furan resin for sand mixing for 1-2 min, then adding silane for evenly mixing, then discharging to obtain resin sand; 2) adding a curing agent into the other part of the original sand for sand mixing for 1 ~ 2min, then discharging to obtain curing agent sand; and 3) evenly stirring the resin sand and the curing agent sand according to the ratio of 1:1, adding sawdust with stirring in the stirring process, stirring for 10 ~ 40min to obtain the furan resin sand. The original sand comprises new sand and regeneration sand with a weight ratio of 1:9, the new sand contains chromite sand accounting for 20% of the total weight of the new sand, the adding amount of the furan resin is 1.2 ~ 3.0% of the total weight of the original sand, the adding amount of the curing agent is 30 ~ 50% of the adding amount of the furan resin, the adding amount of the sawdust is 1.5 ~ 4% of the total weight of the original sand, and the adding amount of the silane is 0.2 ~ 0.8% of the adding amount of the furan resin. The furan resin sand has the characteristics of high strength, good uniformity, good deformability and low production cost, and at the same time can reduce the casting defect rate after use.

Description

technical field [0001] The invention relates to a preparation process of core (mold) sand, in particular to a preparation process of furan resin sand, which belongs to the field of casting technology. Background technique [0002] Furan resin sand is generally prepared by mixing silica sand, resin and curing agent. It has many advantages such as high dimensional accuracy, short production cycle, good mold collapse and high tensile strength. It can be used for casting steel, cast iron and non-ferrous alloy castings. Production. But furan resin sand [0003] The Chinese patent publication number is CN101992260A, and the invention patent published on March 30, 2011 discloses a furan no-hardening resin sand mold for the production of integrally cast axle housings, which is characterized in that raw sand, furan resin, and solidified The agent is molded according to the following method: fully stir the raw sand and 1.0~1.5% furan resin adhesive in the sand mixer, and then add bo...

AI Technical Summary

Problems solved by technology

The furan resin sand prepared by this method has poor yield and uneven sand mixing. At the same time, due to poor thermal conductivity, the casting cannot be fed in time when it solidifies and shrinks, resulting in the formation of shrinkage cracks in thin-walled steel castings.