Iron casting green sand and preparation method thereof

Abstract

The invention discloses an iron casting green sand and a preparation method thereof. The iron casting green sand is prepared from the following raw materials in parts by weight: 80-90 parts of old sand, 10-20 parts of fresh sand, 3-5 parts of attapulgite, 2-4 parts of composite powder, 1.5-2.5 parts of graphite powder, 4-6 parts of sepiolite, 2-3 parts of alums, 3-4 parts of monopotassium phosphate, 2-3 parts of sodium tetraborate, 1.5-2.5 parts of magnesium oxide, 1-2 parts of glucose syrup, 1-1.5 parts of heavy oil and 3-7 parts of water. The iron casting green sand is reasonable in formula, low in cost and simple in preparation method, and sand burning and inclusion of iron casting can be effectively prevented. Besides, the surface of the iron casting prepared by using the green sand is smooth and clean, and the yield of the iron casting is greatly improved.

Description

technical field

[0001] The invention relates to a molding sand and a preparation method thereof, in particular to a green casting iron casting sand and a preparation method thereof. Background technique

[0002] Molding sand is the material used for molding in the casting process. It is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Green sand for iron castings is the most widely used type of green sand. It is mainly used for small and medium cast iron in industries such as automobiles, tractors, internal combustion engines, machine tools, textile machinery, and light industrial machinery. The iron castings of green sand casting in the prior art more or less have defects such as sand sticking, sand inclusion, rough surface, etc., causing the iron castings to be scrapped. Contents of the invention

[0003] The object of the present invention is to provide a kind of green sand f...

Examples

Embodiment Construction

[0013] A kind of green sand for iron castings, which is composed of the following raw materials in weight (kg): old sand 80, new sand 20, attapulgite 4, composite powder 3, graphite powder 2, sepiolite 5, alum 2.5, potassium dihydrogen phosphate 3 , sodium tetraborate 3, magnesium oxide 2, glucose syrup 1.5, heavy oil 1, water 5;

[0014] The preparation method of the composite powder is as follows: a. Weigh perlite, fluorite and barite in a weight ratio of 5:4:3, mix them evenly, pulverize them through a 150 mesh sieve, and then add water to beat to make a solid content of 60%. Slurry, high-speed ball milling for 2 hours, spray drying; b. Add 4% coconut shell powder, 2% calcium fluoride, 1.5% coal powder and 0.6% yttrium oxide to the spray-dried powder, and calcined at 870°C for 35 minutes , and then heated to 1250°C for calcination for 2 hours, water quenched, then placed in a 15% hydrochloric acid solution, heated to boiling and high-speed grinding for 20 minutes, and ...

technical field

[0001] The invention relates to a molding sand and a preparation method thereof, in particular to a green casting iron casting sand and a preparation method thereof. Background technique

[0002] Molding sand is the material used for molding in the casting process. It is generally made by mixing molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Green sand for iron castings is the most widely used type of green sand. It is mainly used for small and medium cast iron in industries such as automobiles, tractors, internal combustion engines, machine tools, textile machinery, and light industrial machinery. The iron castings of green sand casting in the prior art more or less have defects such as sand sticking, sand inclusion, rough surface, etc., causing the iron castings to be scrapped. Contents of the invention

[0003] The object of the present invention is to provide a kind of green sand f...

Examples

Embodiment Construction

[0013] A kind of green sand for iron castings, which is composed of the following raw materials in weight (kg): old sand 80, new sand 20, attapulgite 4, composite powder 3, graphite powder 2, sepiolite 5, alum 2.5, potassium dihydrogen phosphate 3 , sodium tetraborate 3, magnesium oxide 2, glucose syrup 1.5, heavy oil 1, water 5;

[0014] The preparation method of the composite powder is as follows: a. Weigh perlite, fluorite and barite in a weight ratio of 5:4:3, mix them evenly, pulverize them through a 150 mesh sieve, and then add water to beat to make a solid content of 60%. Slurry, high-speed ball milling for 2 hours, spray drying; b. Add 4% coconut shell powder, 2% calcium fluoride, 1.5% coal powder and 0.6% yttrium oxide to the spray-dried powder, and calcined at 870°C for 35 minutes , and then heated to 1250°C for calcination for 2 hours, water quenched, then placed in a 15% hydrochloric acid solution, heated to boiling and high-speed grinding for 20 minutes, and ...