A kind of high temperature resistant molding sand

Abstract

The invention mainly relates to the field of casting and discloses high-temperature-resistant molding sand. The high-temperature-resistant molding sand is prepared from, by weight, 120-130 of silica sand, 7-9 of bentonite, 4-6 of kaolin, 2.1-2.3 of talc, 1.4-1.6 of titanium dioxide, 5-7 of bean pulp, 3-5 of sepiolite, 0.7-0.9 of zinc borate and 0.5-0.7 of sodium silicate; the raw materials are simple, wide in source and low in cost; the tolerable temperature of the molding sand reaches over 1,900 DEG C, the service life of the molding sand is prolonged, the replacement times of the molding sand is reduced, manpower and material resources are saved, and the casting cost is lowered; and the silica sand with the wide source is used as the main raw material, the particle diameter of the silica sand is limited after screening, the particle diameter is appropriate, the scarring and rat tails formed on surfaces of castings are reduced, meanwhile the permeability of the molding sand can be improved, generation of pores and sand holes is avoided, and the defective rate is lowered.

Description

technical field

[0001] The invention mainly relates to the field of casting, in particular to a high temperature resistant molding sand. Background technique

[0002] Molding sand is a material used for molding in casting. Molding sand is generally mixed with molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Molding sand plays an extremely important role in foundry production. Because molding sand Casting waste caused by poor quality accounts for about 30-50% of the total casting waste. Usually, the requirements for molding sand include strength and thermal stability, fluidity, plasticity, air permeability and collapse, that is, whether the molding sand is solidified after the casting is solidified. Ease of damage and whether it is easy to remove from the casting.

[0003] However, the high temperature resistance of the existing molding sand is low, and the molding sand needs to be replaced and processed fre...

Examples

Embodiment 1

[0019] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 120, bentonite 7, kaolin 4, talcum powder 2.1, titanium dioxide 1.4, soybean meal 5, sepiolite 3, zinc borate 0.7, sodium silicate 0.5.

[0020] Described soybean meal, fat content is 7%.

[0021] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0022] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0023] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...

Embodiment 2

[0029] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 125, bentonite 8, kaolin 5, talcum powder 2.2, titanium dioxide 1.5, soybean meal 6, sepiolite 4, zinc borate 0.8, sodium silicate 0.6.

[0030] Described soybean meal, fat content is 8%.

[0031] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0032] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0033] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...

Embodiment 3

[0039] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 130, bentonite 9, kaolin 6, talcum powder 2.3, titanium dioxide 1.6, soybean meal 7, sepiolite 5, zinc borate 0.9, sodium silicate 0.7.

[0040] Described soybean meal, fat content is 9%.

[0041] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0042] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0043] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand mix...

technical field

[0001] The invention mainly relates to the field of casting, in particular to a high temperature resistant molding sand. Background technique

[0002] Molding sand is a material used for molding in casting. Molding sand is generally mixed with molding materials such as raw sand for casting, molding sand binder and auxiliary additives in a certain proportion. Molding sand plays an extremely important role in foundry production. Because molding sand Casting waste caused by poor quality accounts for about 30-50% of the total casting waste. Usually, the requirements for molding sand include strength and thermal stability, fluidity, plasticity, air permeability and collapse, that is, whether the molding sand is solidified after the casting is solidified. Ease of damage and whether it is easy to remove from the casting.

[0003] However, the high temperature resistance of the existing molding sand is low, and the molding sand needs to be replaced and processed fre...

Examples

Embodiment 1

[0019] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 120, bentonite 7, kaolin 4, talcum powder 2.1, titanium dioxide 1.4, soybean meal 5, sepiolite 3, zinc borate 0.7, sodium silicate 0.5.

[0020] Described soybean meal, fat content is 7%.

[0021] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0022] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0023] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...

Embodiment 2

[0029] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 125, bentonite 8, kaolin 5, talcum powder 2.2, titanium dioxide 1.5, soybean meal 6, sepiolite 4, zinc borate 0.8, sodium silicate 0.6.

[0030] Described soybean meal, fat content is 8%.

[0031] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0032] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0033] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand m...

Embodiment 3

[0039] A high-temperature-resistant molding sand is made of the following raw materials in parts by weight: silica sand 130, bentonite 9, kaolin 6, talcum powder 2.3, titanium dioxide 1.6, soybean meal 7, sepiolite 5, zinc borate 0.9, sodium silicate 0.7.

[0040] Described soybean meal, fat content is 9%.

[0041] A method for preparing high temperature resistant molding sand, comprising the following steps:

[0042] (1) Sieve the silica sand, the particle size is 100% through a 50-mesh sieve, 90-92% through a 100-mesh sieve, and 20-25% through a 200-mesh sieve. After sieving, the particle size of the silica sand is limited to make the particle size Appropriate, reduce the formation of scars and rat tails on the surface of castings, and at the same time improve the air permeability of the molding sand, avoid pores and sand holes, reduce the defect rate, and obtain sieved silica sand;

[0043] (2) Add bentonite, kaolin, talcum powder and titanium dioxide to the primary sand mix...