CN105562591A - Ingot mold coating and preparing method - Google Patents

Ingot mold coating and preparing method Download PDF

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Publication number
CN105562591A
CN105562591A CN201610014245.9A CN201610014245A CN105562591A CN 105562591 A CN105562591 A CN 105562591A CN 201610014245 A CN201610014245 A CN 201610014245A CN 105562591 A CN105562591 A CN 105562591A
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China
Prior art keywords
coating
ingot mould
ingot
ingot mold
zinc
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CN201610014245.9A
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Chinese (zh)
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CN105562591B (en
Inventor
王胜民
赵晓军
谭蓉
党建伟
刘金刚
刘华伟
何明奕
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns

Abstract

The invention discloses an ingot mold coating and a preparing method, and belongs to the technical field of non-ferrous metal casting. The ingot mold coating is used for painting of the surface of an inner cavity of an ingot mold during casting of non-ferrous metals such as zinc and aluminum. The ingot mold coating comprises 18%-25% of emery powder, 5%-10% of titanium dioxide, 8%-12% of white mud, 8%-10% of sodium carboxymethylcellulose, 5%-8% of sodium hexametaphosphate, 10%-15% of borax and the balance water. During preparing of the ingot mold coating, emery powder, emery powder, white mud, sodium carboxymethylcellulose and sodium hexametaphosphate are placed in water with the temperature not smaller than 80 DEG C, and finally borax is added. During using, the prepared coating is sprayed to the surface of the inner cavity of the ingot mold at the temperature of 60-80 DEG C. The ingot mold coating is convenient to use and capable of being used online. By means of the coating, the appearances of ingots of non-ferrous metals such as zinc and aluminum are even in luster, and black spot color shading defects do not exist.

Description

A kind of ingot mould coating and preparation method
Technical field
The present invention relates to a kind of ingot mould coating and preparation method, belong to non-ferrous metal casting technology field, the paint spraying of ingot mould surface of internal cavity when casting for the non-ferrous metal such as zinc, aluminium.
Background technology
Current zinc, aluminium ingot mould material mostly are economical and practical cast iron materials, when founding is produced, ingot mould is fixed on (as orthoscopic automatic pouring machine, disc type automatic pouring machine) conveying mechanism of automatic pouring machine, heat radiation by die wall in the moving process of ingot mould after liquid metal pours into ingot mould completes crystallization process, and when ingot mould arrives ingot position, ingot falls and enters stacking operation.There is following defect in cast iron quality ingot mould traditional in current production practices: 1. has good wetability between the liquid metal such as zinc, aluminium and ingot mould, causes often mold sticking occurring during the ingot demoulding, and ingot outward appearance is coarse; 2. during liquid metal crystallization, ingot mould bottom pouring position temperature is the highest, and other position temperature is lower, causes ingot bottom coohng speed uneven, causes solidifying bottom rear ingot casting producing aberration mass defect; 3. during cast, liquid metal produces souring, process of setting high-temperature fusant and ingot casting die wall generation chemical reaction to ingot mould surface, causes ingot mould generation erosion and corrode to be damaged.These defects have not only had a strong impact on the presentation quality of the ingot such as zinc, aluminium, also shorten the service life of ingot mould, add production cost.
For these problems, people attempt improving ingot mould material or carrying out application process to ingot mould surface.As Chinese patent (application number CN201410373850.6) discloses a kind of composite ingot mould, it covers a layer thickness by casting infiltration on the surface at conventional cast iron quality ingot mould is that 2 ~ 10mm ceramic on metal strengthens Particles dispersed layer.This ingot mould can prevent zinc melt to the corrosion of ingot mould, but the ceramic on metal composite bed of 2 ~ 10mm thickness causes the cooling capacity of ingot mould to decline, and causes the productive temp of automatic pouring machine slack-off, reduces productivity ratio; The service life whether bond strength in addition between ceramic on metal composite bed and matrix can meet ingot mould requires it is also a factor not allowing to ignore.Chinese patent (application number CN201420268989) discloses a kind of ingot mould for the production of aluminium alloy ingots, and it is made up of the ingot mould shell of cast iron quality and graphite inner casing, adopts heat conduction bonding agent to combine between the two.This ingot mould is graphite linings because of casting process and liquid metal contacts, can obtain the uniform aluminium ingot of presentation quality, avoid the chromatic aberration defect of ingot casting, and cooling velocity also can meet the productive temp requirement of automatic pouring machine; But the intensity of graphite internal layer is low, easily there is crackle, fracture, cause graphite linings partial destruction, the stability that impact is produced and continuity.
Use for reference the aufbauprinciple of metallurgical furnace, fireproof coating is coated with and is contained in zinc casting ingot mould surface by people, which eliminates aberration and the blackspot of zinc ingot metal, obtains the zinc ingot metal outward appearance of uniform color; But fireproof coating poor thermal conductivity, increases the thermal resistance at zinc ingot metal/die wall interface, obviously extends setting time, cause production efficiency to reduce; The coefficient of thermal expansion difference of the coefficient of thermal expansion of fireproof coating and conventional ingot mould material cast iron is comparatively large in addition, and result causes fireproof coating generating portion to come off, and part is bonded in ingot mould and coats and be difficult to remove, and finally causes ingot mould inner chamber uneven.People adopt again volatile paint to carry out application to ingot mould surface; though protect ingot mould; extend the service life of ingot mould; but ingot mould die wall remains the scaling loss thing of volatile paint; and casting process creates environmental pollution, so volatile paint is also not suitable for the application of zinc casting ingot mould because of the scaling loss volatilization of coating.For this reason, use simple, with low cost, improve ingot casting presentation quality based at present conventional automatic pouring machine process study one, the coating and the using method thereof that extend ingot mould service life become these those skilled in the art technical barrier urgently to be resolved hurrily.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provides a kind of ingot mould coating, the paint spraying of ingot mould surface of internal cavity when casting for the non-ferrous metal such as zinc, aluminium.
Composition and the mass percent of ingot mould coating of the present invention are: schmigel 18% ~ 25%, titanium dioxide 5% ~ 10%, white clay 8% ~ 12%, sodium carboxymethylcellulose 8% ~ 10%, calgon 5% ~ 8%, borax 10% ~ 15%, and surplus is water.
The raw material of ingot mould coating composition of the present invention is technical grade industrial chemicals general on market.
Containing schmigel, white clay in ingot mould coating of the present invention composition, in order to ensure that the flat appearance of obtained ingot casting is smooth, uniform color, require schmigel, the particle diameter of white clay is not more than 100 order granularities.
First schmigel, titanium dioxide, white clay, sodium carboxymethylcellulose, calgon are put into water during ingot mould coating of the present invention, finally add borax.
During ingot mould coating of the present invention, water used is the warm water that temperature is not less than 80 DEG C.
During ingot mould paint spraying of the present invention, the temperature of requirement ingot mould is 60 ~ 80 DEG C.
When ingot mould coating of the present invention uses: after having been prepared with order of addition by mass percentage by above-mentioned raw materials, adopt the method for spraying by applying coating at ingot mould surface of internal cavity, the even situation depending on coating can select spraying 1 passage or 2 passages.
Beneficial effect of the present invention
(1), after adopting ingot mould coating of the present invention, ingot casting appearance luster is even, there is not chromatic aberration defect.
Form one deck coating on ingot mould surface after applying coating of the present invention, by ingot mould and fused zinc, aluminium etc. completely isolated.Because contain the refractory materials such as schmigel, titanium dioxide, borax in coating and coating, coating has suitable thermal resistance, eliminate the heat radiation inhomogeneities bottom ingot mould, in turn ensure that the suitable cooling velocity of liquid metal, eliminate the mass defect such as blackening, aberration.
(2) ingot mould coating of the present invention is easy to use, can apply online.
The composition of ingot mould coating of the present invention is raw materials used draws materials conveniently, the changeover time of production process can be utilized during use to control the running of automatic pouring machine idle stroke, when ingot mould surface temperature is down to 60 ~ 80 DEG C, adopt the mode of spraying by coating even application on ingot mould surface, the even situation depending on coating can select spraying 1 ~ 2 passage.Without the need to extra sintering processes after spraying, can normally produce after drying to be coated.
(3), after adopting ingot mould coating of the present invention, the service life of ingot mould can be extended.
After spraying coating of the present invention, ingot mould surface forms one deck coating, by ingot mould and the isolation such as fused zinc, aluminium, prevents motlten metal to the erosion on ingot mould surface and corrode, extends the service life of ingot mould.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but protection scope of the present invention is not limited to scope described in embodiment.
Embodiment 1
Composition and the mass percent of ingot mould coating described in the present embodiment are: schmigel 18%, titanium dioxide 10%, white clay 12%, sodium carboxymethylcellulose 8%, calgon 8%, borax 15%, and surplus is water.
When ingot mould coating described in the present embodiment uses: above-mentioned raw materials is weighed by mass percentage, first schmigel, titanium dioxide, white clay, sodium carboxymethylcellulose, calgon are put into the water that temperature is 80 DEG C, finally add borax, stir, leave standstill the lather collapse treating to produce in coating.Unloaded ingot mould on zinc automatic pouring machine is advanced with slower speed, and the temperature of ingot mould is 80 DEG C, by prepared spray painting at ingot mould surface of internal cavity.After coating drying, automatic pouring machine returns to normal production state, solidifies the silvery white gloss of zinc ingot metal surface in metallic zinc after ingot, uniform color.Production leadtime shows, after using this ingot mould coating, the service life of zinc ingot metal mould was extended for 28 months by original 14 months.
Embodiment 2
Composition and the mass percent of ingot mould coating described in the present embodiment are: schmigel 25%, titanium dioxide 5%, white clay 8%, sodium carboxymethylcellulose 10%, calgon 5%, borax 10%, and surplus is water.
When ingot mould coating described in the present embodiment uses: above-mentioned raw materials is weighed by mass percentage, first schmigel, titanium dioxide, white clay, sodium carboxymethylcellulose, calgon are put into the water that temperature is 90 DEG C, finally add borax, stir, leave standstill the lather collapse treating to produce in coating.Unloaded ingot mould on aluminium automatic pouring machine is advanced with slower speed, and the temperature of ingot mould is 60 DEG C, by prepared spray painting at ingot mould surface of internal cavity.After coating drying, automatic pouring machine resumes production state, and after solidifying ingot, aluminium ingot surface color is even, no color differnece.Production leadtime shows, after using this ingot mould coating, the service life of aluminium ingot mold was extended for 26 months by original 14 months.
Embodiment 3
Composition and the mass percent of ingot mould coating described in the present embodiment are: schmigel 20%, titanium dioxide 8%, white clay 10%, sodium carboxymethylcellulose 9%, calgon 6%, borax 12%, and surplus is water.
When ingot mould coating described in the present embodiment uses: above-mentioned raw materials is weighed by mass percentage, first schmigel, titanium dioxide, white clay, sodium carboxymethylcellulose, calgon are put into the boiling water of boiling, finally add borax, stir, leave standstill the lather collapse treating to produce in coating.Unloaded ingot mould on zinc automatic pouring machine is advanced with slower speed, and the temperature of ingot mould is 80 DEG C, by prepared spray painting at ingot mould surface of internal cavity.After coating drying, automatic pouring machine resumes production state, and after solidifying ingot, ZnAl alloy ingot surface color is even, no color differnece defect.Production leadtime shows, after using this ingot mould coating, the service life of zinc ingot metal mould was extended for 26 months by original 14 months.

Claims (3)

1. an ingot mould coating, is characterized in that: described paint ingredient and mass percent are: schmigel 18% ~ 25%, titanium dioxide 5% ~ 10%, white clay 8% ~ 12%, sodium carboxymethylcellulose 8% ~ 10%, calgon 5% ~ 8%, borax 10% ~ 15%, surplus is water.
2. the preparation method of ingot mould coating according to claim 1, it is characterized in that: first schmigel, titanium dioxide, white clay, sodium carboxymethylcellulose, calgon are added to the water during coating, finally add borax, during coating, the temperature of water used is not less than 80 DEG C.
3. ingot mould coating according to claim 1, is characterized in that: during applying coating, the temperature of requirement ingot mould is 60 ~ 80 DEG C.
CN201610014245.9A 2016-01-11 2016-01-11 A kind of ingot mould coating and preparation method Active CN105562591B (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN108213327A (en) * 2017-12-25 2018-06-29 山东立中轻合金汽车材料有限公司 It is a kind of suitable for releasing agent of aluminium ingot casting mould and preparation method thereof
CN108555230A (en) * 2018-01-04 2018-09-21 汉中锌业有限责任公司 A kind of preparation method of the zinc ingot metal ingot mold coating of zinc hydrometallurgy

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CN105057568A (en) * 2015-07-27 2015-11-18 明光市留香泵业有限公司 Nanometer-titania-strengthening easily-strippable water-based paint for lost foam casting and preparing method of water-based paint

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CN105057568A (en) * 2015-07-27 2015-11-18 明光市留香泵业有限公司 Nanometer-titania-strengthening easily-strippable water-based paint for lost foam casting and preparing method of water-based paint

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108213327A (en) * 2017-12-25 2018-06-29 山东立中轻合金汽车材料有限公司 It is a kind of suitable for releasing agent of aluminium ingot casting mould and preparation method thereof
CN108555230A (en) * 2018-01-04 2018-09-21 汉中锌业有限责任公司 A kind of preparation method of the zinc ingot metal ingot mold coating of zinc hydrometallurgy

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