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Moulding sand additive suitable for iron casting piece

A technology of additives and iron castings, which is applied in the direction of casting molds, casting molding equipment, and cores, etc., can solve the problems of large pollution of coal powder additives, and achieve the effects of avoiding chemical sticky sand, simple preparation methods, and high recycling

Inactive Publication Date: 2018-08-17
云南衡纬科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of large pollution of existing coal powder additives, and provide a molding sand additive suitable for iron castings. The additive is composed of inorganic composite materials, does not burn, does not produce toxic and harmful gases during the production process, and is environmentally friendly.

Method used

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  • Moulding sand additive suitable for iron casting piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 20% of aluminosilicate powder, 10% of graphite powder, and 70% of bentonite according to the mass ratio of the metering device and mix them evenly. 2 Accounted for 80%, Al 2 o 3 Accounted for 7%, Na 2 O accounts for 6%, K 2 O accounts for 3%, Fe 2 o 3 Accounted for 4%. Pack into the bag. In a foundry, 80% of foundry sand, 15% of molding sand additive, and 5% of water are taken by mass ratio through a metering device, and mixed with a sand mixer. Liquid, cooled and separated to obtain finished castings, the surface of the castings is smooth, and the castings have no other defects. It has been used continuously for 4 months, and the scrap rate of sand inclusion defects in castings has been reduced from 3.5% before use to 1.6%.

Embodiment 2

[0018] Take 24% of aluminosilicate powder, 11% of graphite powder, and 65% of bentonite according to the mass ratio of the metering device and mix them evenly. 2 Accounted for 60%, Al 2 o 3 Accounted for 30%, Na 2 O accounts for 0.5%, K 2 O accounted for 0.5%, Fe 2 o 3 It accounts for 9% and is packed in bags.

[0019] In a foundry, 85% of foundry sand, 12% of molding sand additive, and 3% of water are taken by mass ratio through a metering device, and mixed with a sand mixer. Box molding line, casting molten metal, cooling for 2 hours, separated to obtain finished castings, the surface of the castings is smooth, and the quality of the castings is qualified. Been using it for 6 months.

Embodiment 3

[0021] Take 30% of aluminosilicate powder, 15% of graphite powder, and 55% of bentonite according to the mass ratio of the metering device and mix them evenly. 2 Accounted for 55%, Al 2 o 3 Accounted for 35%, Na 2 O accounts for 3%, K 2 O accounts for 3%, Fe 2 o 3 Accounted for 4%, packed into bags.

[0022] In a foundry, 86% of foundry sand, 10% of molding sand additive and 4% of water are taken by mass ratio through a metering device, and mixed with a sand mixer for 90 seconds. After mixing, the mixture is put into a sand storage hopper and vertically typed Boxless extrusion automatic molding line, casting molten metal, cooling and separation to obtain finished castings, the surface of the castings is smooth, and the quality of the castings is qualified. It has been used continuously for 7 months.

[0023] Such as figure 1 Shown is the microstructure topography diagram of the molding sand additive of the present invention. The molding sand additive of the present in...

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Abstract

The invention relates to the field of industrial casting, in particular to a moulding sand additive suitable for an iron casting piece. The moulding sand additive suitable for the iron casting piece is prepared from mixing the following raw materials in percentage by mass: 20 to 40 percent of aluminosilicate powder, 10 to 19 percent of graphite powder, and 50 to 70 percent of bentonite, wherein the aluminosilicate powder is prepared from mixing the following raw materials in percentage by mass: 55 to 80 percent of SiO2, 7 to 40 percent of Al2O3, 0.5 to 6 percent of Na2O, 0.5 to 6 percent of K2O and 0.5 to 9 percent of Fe2O3. The additive is prepared from inorganic composite materials, is incombustible so as not to produce toxic and hazardous waste gas during a production process, and is green and environmental-friendly. The moulding sand additive mainly replaces pulverized coal in wet type clay sand, has excellent clay sand resistance, and is used for the iron casting piece, so that the wettability of a casting mould and a metal liquid is reduced, the casting piece cannot stick sand, and the occurrence of the defects such as scab of the casting piece is reduced.

Description

technical field [0001] The invention relates to the field of industrial casting, in particular to a molding sand additive suitable for iron castings. Background technique [0002] At present, in the foundry industry, the castings produced by sand casting account for 80% of the total castings, so the molding materials of sand casting occupy a major position in the foundry industry. Its performance directly affects the energy consumption of casting production, environmental pollution, casting quality, production efficiency and cost. [0003] Coal powder clay green sand, which is widely used at home and abroad, is generally made of raw sand, bentonite, coal powder additives and water. It has a certain anti-sticking effect, low cost, and high efficiency. Seriously, during the casting process, the pulverized coal is burned and decomposed to produce toxic gases and carcinogens, causing environmental pollution and affecting the health of workers. According to statistics, the use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 牛文峰李祖来
Owner 云南衡纬科技有限公司
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