CN103586395A

CN103586395A - Molding sand for automatic production line and preparation method thereof

Info

Publication number: CN103586395A
Application number: CN201310483700.6A
Authority: CN
Inventors: 杨奎琦; 陈正义; 张斌
Original assignee: Changli Forging Co Ltd
Current assignee: Changli Forging Co Ltd
Priority date: 2013-10-16
Filing date: 2013-10-16
Publication date: 2014-02-19

Abstract

The invention provides molding sand for an automatic production line. The molding sand is prepared from the following raw materials in parts by weight: 60-70 parts of returned sand, 180-190 parts of fresh sand, 40-50 parts of pottery clay, 30-40 parts of pulverized coal, 40-45 parts of sodium bentonite, 20-30 parts of calcium bentonite, 4-6 parts of sodium borate, 2-4 parts of aluminum oxide, 2-4 parts of calcium oxide, 14-18 parts of flour, 20-25 parts of iron ore concentrate powder, 20-40 parts of clay, 5-8 parts of foot oil, 2-3 parts of soybean oil and a proper amount of water. The molding sand prepared by carrying out high-temperature calcination on the sand, the fresh sand, the pottery clay and the like in combination with the dispersion and grinding of the foot oil and the like has excellent air permeability, smoothness, mobility, toughness and plasticity. Meanwhile, by using the pulverized coal, the casting burnt-on sand phenomenon is reduced, and the brightness of castings is greatly improved. Compared with conventional molding sand, the molding sand has the advantages that the using amount of the pulverized coal is reduced; and the collapsibility of the molding sand is improved by using the flour and the iron ore concentrate powder. The molding sand has strong mobility, good air permeability and relatively high viscosity and is suitable for automatic molding line production.

Description

A kind of molding sand for automatic assembly line and preparation method thereof

Technical field

The present invention relates to a kind of casting field, relate in particular to a kind of molding sand for automatic assembly line and preparation method thereof.

Background technology

Molding sand is in casting, to be used for the material of moulding.Molding sand is generally mixed according to a certain percentage by Modeling Materials such as Foundry sand, moulding sand binder and additional things, also available natural silica sand argillaceous, the sand formulation Sand particle diameter that common cast aluminium is used is too large or too little, molding sand material footpath is too large, although gas permeability is better, aloxite part surface ratio is more coarse, fineness is bad, molding sand material footpath is too little, causes sand mold gas permeability bad, and aluminium casting has pore to produce.Domestic and international widely used coal dust clay green-sand, generally by the mixed system of roughing sand, binding agent, coal dust additive etc. and water, formed, there is certain anti-scab effect and the cost of material is low, production efficiency is high, but its consumption is large, discharge is serious, at casting process coal dust firing, decompose and produce toxic gas and pollute.

Molding sand is different by binding agent used, can be divided into clay-bonded sand, water-glass sand, cement bonded sand, quartz sand etc., and that with clay-bonded sand, water-glass sand and quartz sand, uses is maximum.The effect of molding sand in Foundry Production is very important, and the casting wasted product causing because of the poor quality of molding sand accounts for 30～50% of the total waste product of foundry goods.Conventionally to the requirement of molding sand, be: 1, there is higher intensity and heat endurance, to bear the effect of various external force and high temperature.2, good mobility, the ability that molding sand mutually moves between sand grains under external force or Action of Gravity Field own.3, certain plasticity, molding sand is out of shape under external force, can keep the ability of the shape that gives after external force is removed.4, good gas permeability, molding sand hole sees through the ability of gas.5, high collapsibility, weighs up again grittiness, and after casting solidification, whether molding sand easily destroys, the performance of whether easily removing from foundry goods.

Current casting field development rapidly, higher for the performance requirement of steel-casting and ironcasting, thereby require further to promote the performance of molding sand.

Summary of the invention

The object of the present invention is to provide a kind of adding in molding sand of automatic assembly line and preparation method thereof, this molding sand has the feature of high gas permeability, collapsibility, good fluidity.

Technical scheme of the present invention is as follows:

For a molding sand for automatic assembly line, it is characterized in that being made by the raw material of following weight portion: return sand 60-70, fresh sand 180-190, potter's clay 40-50, coal dust 30-40, sodium bentonite 40-45, calcium-base bentonite 20-30, Boratex 4-6, aluminium oxide 2-4, calcium oxide 2-4, flour 14-18, fine iron breeze 20-25, clay 20-24, oil foot 5-8, soybean oil 2-3, water are appropriate;

The preparation method of the described molding sand for automatic assembly line, it is characterized in that comprising the following steps: return sand, fresh sand, potter's clay mixed powder are broken into 100-200 order powder, then add sodium bentonite, calcium-base bentonite, Boratex, oil foot suitable quantity of water, dispersed with stirring, pugging, send in 1410-1420 ℃ of calcining furnace and calcine 4-5 hour, take out and be crushed to 50-100 order, obtain calcining material; Coal dust, aluminium oxide, calcium oxide, clay, soybean oil are mixed, after grinding distribution 20-30 minute, mix with other residual components, add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product.

Beneficial effect of the present invention

The present invention has used with sand, fresh sand, potter's clay etc., through high-temperature calcination, in conjunction with adding the loose grinding of oil foot decile, make molding sand there is excellent gas permeability, slickness, mobility, toughness, plasticity, used coal dust simultaneously, the phenomenon of foundry goods scab, peeling significantly reduces, greatly improved the brightness of foundry goods, and fewer than traditional sand pulverized coal consumption, and environmental protection has increased again economic benefit; By using flour, fine iron breeze to increase collapsibility.The present invention is more liquid, good permeability not only, and higher, the applicable automatic mo(u)lding line of viscosity is produced.

The specific embodiment

For a molding sand for automatic assembly line, by following weight portion (kilogram) raw material make: return sand 65, fresh sand 185, potter's clay 45, coal dust 35, sodium bentonite 43, calcium-base bentonite 25, Boratex 5, aluminium oxide 3, calcium oxide 3, flour 16, fine iron breeze 23, clay 23, oil foot 6, soybean oil 2.5, water are appropriate;

The preparation method of the described molding sand for automatic assembly line, it is characterized in that comprising the following steps: return sand, fresh sand, potter's clay mixed powder are broken into 150 order powder, then add sodium bentonite, calcium-base bentonite, Boratex, oil foot suitable quantity of water, dispersed with stirring, pugging, send in 1415 ℃ of calcining furnaces and calcine 4.5 hours, take out and be crushed to 70 orders, obtain calcining material; Coal dust, aluminium oxide, calcium oxide, clay, soybean oil are mixed, and grinding distribution, after 26 minutes, mixes with other residual components, adds and is equivalent to the water wet mixing 13 minutes of compound weight 4% and get final product.

The processing performance of the molding sand that the present invention makes:

Green compression strength: 0.120Mpa, air penetrability: 101%, hot green tensile strength: 478Kpa, shatter index: 82%.

Claims

1. for a molding sand for automatic assembly line, it is characterized in that being made by the raw material of following weight portion: return sand 60-70, fresh sand 180-190, potter's clay 40-50, coal dust 30-40, sodium bentonite 40-45, calcium-base bentonite 20-30, Boratex 4-6, aluminium oxide 2-4, calcium oxide 2-4, flour 14-18, fine iron breeze 20-25, clay 20-24, oil foot 5-8, soybean oil 2-3, water are appropriate.

2. according to claim 1 for the preparation method of the molding sand of automatic assembly line, it is characterized in that comprising the following steps: return sand, fresh sand, potter's clay mixed powder are broken into 100-200 order powder, then add sodium bentonite, calcium-base bentonite, Boratex, oil foot suitable quantity of water, dispersed with stirring, pugging, send in 1410-1420 ℃ of calcining furnace and calcine 4-5 hour, take out and be crushed to 50-100 order, obtain calcining material; Coal dust, aluminium oxide, calcium oxide, clay, soybean oil are mixed, after grinding distribution 20-30 minute, mix with other residual components, add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product.