AU2012101160A4 - A Resin Sand - Google Patents

Abstract

Title: A Resin Sand Abstract The invention discloses a resin sand, comprising resin and mixed sand composed of raw sand and used sand, the used sand takes up 80% ~ 85% of the mass of the mixed sand, the raw sand takes up 15% ~ 20% of the mass of the mixed sand, and the resin adding amount of the resin is 1.60% ~ 1.63% of the total mass of the resin sand. As a rational proportion proposal of the raw sand and used sand is adopted and an adding amount range of the resin is reselected according to the proportion proposal, the invention meets the use requirements of the resin sand mold and is convenient for recycling the used sand, and the sand shakeout machine shakes out the sand easily.

Description

Description A Resin Sand Technical Field The invention relates to a molding sand used for casting, in particular relates to a resin sand. Background of the Invention The resin sand is used for deburring electronic products, thermosetting plastic products and rubber products and cleaning molds, sensitive elements and gold-plated components, can be used as paint removers, adhesives, reinforcing agents , waterproof agents, flame retardants etc., and is widely used in various fields such as architectural decoration industry, transportation industry, advertising industry, agriculture, electronic appliances and foundry industry. In the casting process of the resin sand mold, the adding amount of the resin in the existing national standard is 1.2% - 1.8% of the mass of the molding sand. The general ultimate compressive strength in the industry is > 2.OMPa. At present the molding sand used by the enterprises is sand mixed by raw sand and used sand at certain proportion, however in the national standard, the adding amount range of the resin is only for raw sand, and the range is very large, such resin sand has certain problems in actual use, for example the sand shakeout machine shakes out the sand difficultly. Summary of the Invention The technical problem to be solved by the invention is to provide a resin sand, which adopts a rational proportion proposal of the raw sand and the used sand, reselects the an adding amount range of the resin according to the proportion proposal, meets the use requirements of the resin sand mold and is convenient for recycling the used sand, and the sand shakeout machine shakes out the sand easily. In order to solve above-mentioned existing technical problems, the invention adopts a technical proposal as follows: a resin sand, comprising resin and mixed sand composed of raw sand and used sand, the used sand takes up 80% - 85% of the mass of the mixed sand, the raw sand takes up 15% - 20% of the mass of the mixed sand, and the resin adding amount of the resin is 1.60% - 1.63% of the total mass of the resin sand. Above-mentioned used sand is produced as follows: in the casting process of the resin sand, the resin mixed with the harder need to be added into the raw sand, mixed evenly and put into the molding flask, the resin sand is molded after about half an hour, at last the resin sand has a certain strength; then pouring is performed, after the poured molten steel is solidified, the product is taken out, and the remaining sand is performed with the stripping process etc. with a sand shakeout machine, then the used sand is produced. Preferably, the ultimate compressive strength of the resin sand is 1.8 - 2.0MPa. Advantages of the invention comprise: the mixed sand by mixing the raw sand the used sand according to the proportion proposal of the invention has a rational proportion, and the cost is easy to be controlled; wherein the adding amount of the resin is for the mixed sand, and the range is quite small, the ultimate compressive strength of the resin sand is 1.8 - 2.0MPa, which is enough for the sand mold; moreover the sand shakeout machine shakes out the sand easily, which is convenient for recycling the used sand; the invention has a high practicability. Detailed Description of the Invention A resin sand comprises resin and mixed sand composed of raw sand and used sand, the used sand takes up 80% - 85% of the mass of the mixed sand, the raw sand takes up 15% - 20% of the mass of the mixed sand, and the resin adding amount of the resin is 1.60% - 1.63% of the total mass of the resin sand. Example 1: A resin sand comprises mixed sand composed of raw sand and used sand, the used sand takes up 80% of the mass of the mixed sand, the raw sand takes up 20% of the mass of the mixed sand, and the resin takes up 1.60% of the total mass of the resin sand. Example 2: A resin sand comprises mixed sand composed of raw sand and used sand, the used sand takes up 82.5% of the mass of the mixed sand, the raw sand takes up 17.5% of the mass of the mixed sand, and the resin takes up 1.61% of the total mass of the resin sand. Example 3: A resin sand comprises mixed sand composed of raw sand and used sand, the used sand takes up 85% of the mass of the mixed sand, the raw sand takes up 15% of the mass of the mixed sand, and the resin takes up 1.63% of the total mass of the resin sand. 2

Claims (2)

1. A resin sand, comprising resin and mixed sand composed of raw sand and used sand, wherein: the used sand takes up 80% - 85% of the mass of the mixed sand, the raw sand takes up 15% 20% of the mass of the mixed sand, and the resin adding amount of the resin is 1.60% - 1.63% of the total mass of the resin sand.

2. The resin sand according to claim 1, wherein the ultimate compressive strength of the resin sand is 1.8 - 2.OMPa. 3