CN106077439A - A kind of train aluminium alloy castings casting easy defeated and dispersed waterglass core sand and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of train aluminium alloy castings casting easy defeated and dispersed waterglass core sand and preparation method thereof, it is formed by the preparation of raw material of following weight portion: olivine sand 140 150, Punica granatum L. stone sand 30 40, allophane 20 30, siltstone 30 35, calcined kaolin 15 20, asbestos leftover bits and pieces 8 10, beryllium oxide 68, boiling furnace slag 12 14, waterglass 8 10, sodium metaaluminate 24, ripe Alumen powder 12 etc..The present invention uses the core sand prepared by raw material such as olivine sand, Punica granatum L. stone sand, siltstone to make scab, pore, crackle, the ratio of defects such as loose below 5% when Casting Aluminum Alloy Based, casting yield is greatly improved, reduces casting cost；The sodium metaaluminate added, ripe Alumen powder improve the hardening rate of waterglass, make core sand intensity height, collapsibility good, decrease the generation of harmful gas simultaneously, the hydroxypropyl PASELLI EASYGEL of interpolation, propylene glycol alginate etc. are attached to the surface of the roughing sand such as olivine sand, improve its boundary strength, improve green compression strength and the hot green tensile strength of core sand.

Description

A kind of train aluminium alloy castings casting easy defeated and dispersed waterglass core sand and preparation method thereof

Invention field

The invention belongs to foundary industry field, concretely relate to a kind of train aluminium alloy castings easy defeated and dispersed water of casting Sodium silicate core sand and preparation method thereof.

Background technology

Core sand is for manufacturing the material of core in Foundry Production, typically by casting model powder, core sand binder and additional thing etc. Modeling Material mixes according to a certain percentage.The generally requirement to molding sand is: have higher intensity and heat stability, to hold Acted on by various external force and high temperature；Good mobility, i.e. molding sand are mutual between sand grains under external force or action of gravity own The ability of movement；Certain plasticity, i.e. molding sand deform under external force, can keep the shape given after external force is removed The ability of shape；Preferably breathability, i.e. molding sand hole are through the ability of gas；High collapsibility, also known as knockability, i.e. at foundry goods After solidification, whether molding sand is easily destroyed, if the performance easily removed from foundry goods.Core sand is different by binding agent used, can divide For clay-bonded sand, water-glass sand, cement bonded sand, wollastonite in powder etc., most with clay-bonded sand, water-glass sand and wollastonite in powder.

For aluminium alloy casts, the sand formulation Sand particle diameter of traditional used in aluminium alloy casting is the biggest or the least, type Sand material footpath is the biggest, although breathability is preferable, but aloxite part surface ratio is rougher, and fineness is bad, and molding sand material footpath is the least, causes Mo ld void is bad, and aluminium casting has pore to produce.Domestic and international widely used coal dust clay green-sand, typically by roughing sand, viscous Knot agent, coal dust additive etc. are blended with water, have certain Sand sticking-resistant effect and that the cost of material is low, production efficiency is high is excellent Point, but its consumption is big, discharge is serious, decompose at casting process coal dust firing and produce toxic gas and pollute.And traditional type The ratio of defects such as the scab of sand Cast aluminium alloy gold product, pore, crackle are more than 15%, and percent defective height causes the very big of casting cost Increase.

Summary of the invention

The invention aims to make up the defect of prior art, it is provided that a kind of train aluminium alloy castings casting is with easily bursting Aproll sodium silicate core sand and preparation method thereof.

For reaching above-mentioned purpose, the technical solution used in the present invention is:

A kind of train aluminium alloy castings casts with easy defeated and dispersed waterglass core sand, the preparation of raw material of following weight portion form: Fructus Canarii albi Stone sand 140-150, Punica granatum L. stone sand 30-40, allophane 20-30, siltstone 30-35, calcined kaolin 15-20, asbestos are got a foothold Material 8-10, beryllium oxide 6-8, boiling furnace slag 12-14, waterglass 8-10, sodium metaaluminate 2-4, ripe Alumen powder 1-2, hydroxypropyl two form sediment Powder phosphate ester 2-4, propylene glycol alginate 2-3, microcrystalline wax 4-6, ferrosilicon powder 5-8, basic zirconium chloride 3-5, sulfamic acid sodium 4-6, Sodium hexameta phosphate 5-7, water are appropriate.

A kind of train aluminium alloy castings casting preparation method of easy defeated and dispersed waterglass core sand, comprises the following steps:

(1) by boiling furnace slag, asbestos leftover bits and pieces, allophane, siltstone mix homogeneously, it is broken into 60-80 mesh granular size, so Rear feeding 1200-1300 DEG C of calcining furnace in calcine 2-4h, take out add while hot olivine sand, Punica granatum L. stone sand, calcined kaolin do Mixed 3-5min, is subsequently adding the water stirring of gross weight 40-50%, is ground into 150-200 mesh, obtains mixture after dehydrate；

(2) mixture is dried at a temperature of 110-120 DEG C to water content below 5%, be subsequently adding propylene glycol alginate, Microcrystalline wax, high speed rotating 6-8min under the rotating speed of 800-1000r/min, obtain modified mixed sand；

(3) modification mixed sand, beryllium oxide, ferrosilicon powder, basic zirconium chloride, sulfamic acid sodium, sodium hexameta phosphate are poured in puddle mixer Mixing 3-5min, then adds raw materials such as waterglass, sodium metaaluminate, ripe Alumen powder, hydroxypropyl PASELLI EASYGEL and total The water of quality 10-15%, shakes out after mixing 5-8min, obtains described core sand.

Beneficial effects of the present invention:

The present invention uses prepared by the raw materials such as olivine sand, Punica granatum L. stone sand, allophane, siltstone, ferrosilicon powder, basic zirconium chloride Core sand makes scab, pore, crackle, the ratio of defects such as loose below 5% when Casting Aluminum Alloy Based, and foundry goods is greatly improved Product rate, reduces casting cost；The sodium metaaluminate added, ripe Alumen powder improve the hardening rate of waterglass, make core sand intensity high, Collapsibility is good, decreases the generation of harmful gas simultaneously, the hydroxypropyl PASELLI EASYGEL of interpolation, propylene glycol alginate, crystallite Paraffin is attached to the surface of the roughing sand such as olivine sand, improves its boundary strength, improves the green compression strength of core sand and heat is wet draws Intensity.

Detailed description of the invention

Below in conjunction with specific embodiment, technical scheme of the present invention is further described.

Embodiment 1:

A kind of train aluminium alloy castings casting with easy defeated and dispersed waterglass core sand, is formed by the preparation of raw material of following weight portion (kg): Olivine sand 140, Punica granatum L. stone sand 30, allophane 20, siltstone 30, calcined kaolin 15, asbestos leftover bits and pieces 8, beryllium oxide 6, Boiling furnace slag 12, waterglass 8, sodium metaaluminate 2, ripe Alumen powder 1, hydroxypropyl PASELLI EASYGEL 2, propylene glycol alginate 2, crystallite Paraffin 4, ferrosilicon powder 5, basic zirconium chloride 3, sulfamic acid sodium 4, sodium hexameta phosphate 5, water are appropriate.

A kind of train aluminium alloy castings casting preparation method of easy defeated and dispersed waterglass core sand, comprises the following steps:

(1) by boiling furnace slag, allophane, siltstone mix homogeneously, it is broken into 60-80 mesh granular size, is then fed into 1200- 1300 DEG C of calcining furnaces are calcined 2-4h, take out add olivine sand while hot, Punica granatum L. stone sand, calcined kaolin are dry mixed 3-5min, so The water stirring of rear addition gross weight 40-50%, is ground into 150-200 mesh, obtains mixture after dehydrate；

(2) mixture is dried at a temperature of 110-120 DEG C to water content below 5%, be subsequently adding propylene glycol alginate, Microcrystalline wax, high speed rotating 6-8min under the rotating speed of 800-1000r/min, obtain modified mixed sand；

(3) modification mixed sand, asbestos leftover bits and pieces, beryllium oxide, ferrosilicon powder, basic zirconium chloride, sulfamic acid sodium, sodium hexameta phosphate are fallen Enter mixing 3-5min in puddle mixer, then add waterglass, sodium metaaluminate, ripe Alumen powder, hydroxypropyl PASELLI EASYGEL etc. Raw material and the water of gross mass 10-15%, shake out after mixing 5-8min, obtain described core sand.

Embodiment 2:

A kind of train aluminium alloy castings casting with easy defeated and dispersed waterglass core sand, is formed by the preparation of raw material of following weight portion (kg): Olivine sand 145, Punica granatum L. stone sand 35, allophane 25, siltstone 32.5, calcined kaolin 17.5, asbestos leftover bits and pieces 9, oxidation Beryllium 7, boiling furnace slag 13, waterglass 9, sodium metaaluminate 3, ripe Alumen powder 1.5, hydroxypropyl PASELLI EASYGEL 3, propylene glycol alginate 2.5, microcrystalline wax 5, ferrosilicon powder 6.5, basic zirconium chloride 4, sulfamic acid sodium 5, sodium hexameta phosphate 6, water are appropriate.

Preparation method is with embodiment 1.

Embodiment 3:

A kind of train aluminium alloy castings casting with easy defeated and dispersed waterglass core sand, is formed by the preparation of raw material of following weight portion (kg): Olivine sand 150, Punica granatum L. stone sand 40, allophane 30, siltstone 35, calcined kaolin 20, asbestos leftover bits and pieces 10, beryllium oxide 8, Boiling furnace slag 14, waterglass 10, sodium metaaluminate 4, ripe Alumen powder 2, hydroxypropyl PASELLI EASYGEL 4, propylene glycol alginate 3, micro- Spar wax 6, ferrosilicon powder 8, basic zirconium chloride 5, sulfamic acid sodium 6, sodium hexameta phosphate 7, water are appropriate.

Preparation method is with embodiment 1.

The train aluminium alloy castings casting performance test results of easy defeated and dispersed waterglass core sand that above-described embodiment 1-3 prepares As shown in the table:

Claims (2)

1. a train aluminium alloy castings casts with easy defeated and dispersed waterglass core sand, it is characterised in that by the raw material of following weight portion Formulated: olivine sand 140-150, Punica granatum L. stone sand 30-40, allophane 20-30, siltstone 30-35, calcined kaolin 15-20, asbestos leftover bits and pieces 8-10, beryllium oxide 6-8, boiling furnace slag 12-14, waterglass 8-10, sodium metaaluminate 2-4, ripe Alumen powder 1-2, hydroxypropyl PASELLI EASYGEL 2-4, propylene glycol alginate 2-3, microcrystalline wax 4-6, ferrosilicon powder 5-8, basic zirconium chloride 3-5, Sulfamic acid sodium 4-6, sodium hexameta phosphate 5-7, water are appropriate.

A kind of train aluminium alloy castings the most according to claim 1 casting preparation method of easy defeated and dispersed waterglass core sand, It is characterized in that, comprise the following steps:

(1) by boiling furnace slag, allophane, siltstone mix homogeneously, it is broken into 60-80 mesh granular size, is then fed into 1200- 1300 DEG C of calcining furnaces are calcined 2-4h, take out add olivine sand while hot, Punica granatum L. stone sand, calcined kaolin are dry mixed 3-5min, so The water stirring of rear addition gross weight 40-50%, is ground into 150-200 mesh, obtains mixture after dehydrate；

(2) mixture is dried at a temperature of 110-120 DEG C to water content below 5%, be subsequently adding propylene glycol alginate, Microcrystalline wax, high speed rotating 6-8min under the rotating speed of 800-1000r/min, obtain modified mixed sand；

(3) modification mixed sand, asbestos leftover bits and pieces, beryllium oxide, ferrosilicon powder, basic zirconium chloride, sulfamic acid sodium, sodium hexameta phosphate are fallen Enter mixing 3-5min in puddle mixer, then add waterglass, sodium metaaluminate, ripe Alumen powder, hydroxypropyl PASELLI EASYGEL etc. Raw material and the water of gross mass 10-15%, shake out after mixing 5-8min, obtain described core sand.