CN103521678A

CN103521678A - Molding sand capable of increasing brightness of castings and preparation method thereof

Info

Publication number: CN103521678A
Application number: CN201310481145.3A
Authority: CN
Inventors: 孙爱琴
Original assignee: Hefei Tenver Precision Casting Co Ltd
Current assignee: Hefei Tenver Precision Casting Co Ltd
Priority date: 2013-10-16
Filing date: 2013-10-16
Publication date: 2014-01-22

Abstract

The invention relates to molding sand capable of increasing the brightness of castings. The molding sand capable of increasing the brightness of castings is prepared from the following raw materials in parts by weight: 200-240 parts of silica sand, 20-25 parts of magnesium chloride, 45-55 parts of acetylene sludge, 15-20 parts of gangue, 30-40 parts of kieselguhr, 2-3 parts of calcium formate, 30-40 parts of glass beads, 30-35 parts of ceramsity, 14-18 parts of starch, 12-15 parts of wood fiber, 4-5 parts of coal dust, 2-3 parts of engine oil and a proper amount of water. According to the molding sand, silica, acetylene sludge and the like are adopted, and subjected to calcining, grinding, high-temperature calcining, and addition of ceramsity and starch, the mixture is dispersedly ground, so that the molding sand has excellent air permeability, caking property, toughness, plasticity and collapsibility; and by adopting the coal dust, the phenomena of sand burning and peeling of the castings are remarkably reduced, the brightness of castings is greatly improved. Besides, the use amount of coal dust of the traditional molding sand is small, so that environmental protection is achieved, and the economic benefit is increased.

Description

A kind of molding sand that increases foundry goods brightness 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 that increases foundry goods brightness 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 molding sand that increases foundry goods brightness and preparation method thereof, this molding sand has high gas permeability, collapsibility, can improve the feature of foundry goods brightness.

Technical scheme of the present invention is as follows:

Increase a molding sand for foundry goods brightness, it is characterized in that being made by the raw material of following weight portion: quartz sand 200-240, magnesium chloride 20-25, carbide slag 45-55, gangue 15-20, diatomite 30-40, calcium formate 2-3, glass bead 30-40, pottery sand 30-35, starch 14-18, wooden pricker dimension 12-15, coal dust 4-5, machine oil 2-3, water are appropriate;

The preparation method of the molding sand of described increase foundry goods brightness, it is characterized in that comprising the following steps: quartz sand, magnesium chloride, carbide slag, gangue, diatomite are put into 530-570 ℃ of calcining furnace and calcine 4-5 hour, then, take out, be ground into 250-400 order powder, then add machine oil, suitable quantity of water, dispersed with stirring, pugging, sends in 1410-1430 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; To make pottery sand, starch, wooden pricker dimension, coal dust mixes, and grinding distribution 1-2 hour, obtains after 150-200 powder material, mixes, then add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product with calcining material, other residual components.

Beneficial effect of the present invention

The present invention has used quartz sand, carbide slag etc., through calcining, pulverizing, high-temperature calcination again, combination, add the dispersion grinding such as pottery sand, starch, make molding sand there is excellent gas permeability, caking property, toughness, plasticity, collapsibility, 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.

The specific embodiment

Increase a molding sand for foundry goods brightness, by following weight portion (kilogram) raw material make: quartz sand 230, magnesium chloride 23, carbide slag 50, gangue 17, diatomite 35, calcium formate 2, glass bead 35, pottery sand 32, starch 16, wooden pricker dimension 13, coal dust 4, machine oil 2.5, water are appropriate;

The preparation method of the molding sand of described increase foundry goods brightness, comprise the following steps: quartz sand, magnesium chloride, carbide slag, gangue, diatomite are put into 550 ℃ of calcining furnaces and calcine 4 hours, then, take out, be ground into 300 order powder, then add machine oil, suitable quantity of water, dispersed with stirring, pugging, sends in 1420 ℃ of calcining furnaces and calcines 4.5 hours, taking-up is crushed to 80 orders, obtains calcining material; To make pottery sand, starch, wooden pricker dimension, coal dust mixes, and grinding distribution 1.6 hours, obtains after 170 powder materials, mixes, then add and be equivalent to the water wet mixing 13 minutes of compound weight 4% and get final product with calcining material, other residual components.

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

Green compression strength: 0.120Mpa, air penetrability: 120%, hot green tensile strength: 468Kpa, shatter index: 87%.

Claims

1. increase a molding sand for foundry goods brightness, it is characterized in that being made by the raw material of following weight portion: quartz sand 200-240, magnesium chloride 20-25, carbide slag 45-55, gangue 15-20, diatomite 30-40, calcium formate 2-3, glass bead 30-40, pottery sand 30-35, starch 14-18, wooden pricker dimension 12-15, coal dust 4-5, machine oil 2-3, water are appropriate.

2. increase according to claim 1 the preparation method of the molding sand of foundry goods brightness, it is characterized in that comprising the following steps: quartz sand, magnesium chloride, carbide slag, gangue, diatomite are put into 530-570 ℃ of calcining furnace and calcine 4-5 hour, then, take out, be ground into 250-400 order powder, then add machine oil, suitable quantity of water, dispersed with stirring, pugging, sends in 1410-1430 ℃ of calcining furnace and calcines 4-5 hour, taking-up is crushed to 50-100 order, obtains calcining material; To make pottery sand, starch, wooden pricker dimension, coal dust mixes, and grinding distribution 1-2 hour, obtains after 150-200 powder material, mixes, then add and be equivalent to water wet mixing 10-15 minute of compound weight 3-5% and get final product with calcining material, other residual components.