CN103084540A - Preparation method of evaporative pattern casting (EPC) coating for casting heat-resistant steel or wear-resistant alloy steel - Google Patents
Preparation method of evaporative pattern casting (EPC) coating for casting heat-resistant steel or wear-resistant alloy steel Download PDFInfo
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- CN103084540A CN103084540A CN2013100347510A CN201310034751A CN103084540A CN 103084540 A CN103084540 A CN 103084540A CN 2013100347510 A CN2013100347510 A CN 2013100347510A CN 201310034751 A CN201310034751 A CN 201310034751A CN 103084540 A CN103084540 A CN 103084540A
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Abstract
The invention discloses a preparation method of an evaporative pattern casting (EPC) coating for casting heat-resistant steel or wear-resistant alloy steel. The EPC coating comprises the following components in percentages by weight: 60-70% of fireproof material, 3-8% of suspending agent, 2-5% of other auxiliary agents and the balance of water, wherein the fireproof material is composed of bauxite, zircon powder, magnesium powder, quartz powder, brown fused alumina powder and white fused alumina powder; the granularity and the mass percentage are as follows: 78% of -270 to -320 meshes, 15% of -200 to -270 meshes, 5% of -100 to -200 meshes, 2% or less of +100 meshes, 5% of -100 to -200 meshes and 2% or less of +100 meshes; the suspending agent is sodium-based bentonite powder and aqueous carboxymethyl cellulose sodium solution on the mass ratio of 1:1; and other auxiliary agents are styrene-acrylic emulsion or sulfate. Compared with other coatings, the coating prepared by using the method has the advantages that the production steps are simplified, the strength of the coating is effectively increased, and defects such as skin inclusion, slag inclusion and sand burning of castings caused by coating skins formed by likely dropping of a coating layer of a foamed mold in a molten iron pouring process, are reduced.
Description
Technical field
The present invention relates to lost foam casting process, belong to the casting technique field, relate in particular to a kind of lost foam paint compound method for casting heat-resistant steel or wear-resisting alloy steel.
Background technology
People usually are referred to as lost foam casting and are called again dry sand full mold negative pressure casting, be referred to as EPC abroad, it is one of state-of-the-art casting technique in the world at present, directly be embedded in vibration molding in dried quartz sand with paraffin or polyethylene foamed (usually being the benzene plate) analogue formation, form benzene plate entity sand mold casting mold, when pouring molten iron in this entity casting mold, the polystyrene combustion gasification, molten iron is full of polystyrene occupied space, solidifies the cooling rear formation foundry goods identical with model.
But its weak point is: at first, the free carbon richness that produces after the polystyrene burning is amassed on foundry goods inside or cast(ing) surface and is formed carbon distribution, causes finished surface to scrap because of the carbon distribution defective; Secondly, because easily coming off, benzene template dope layer forms pigment finish leather, the casting flaw that causes foundry goods bark pocket, slag inclusion, scab etc. to be difficult to overcome in molten steel pouring course; In addition, easily produce the iron burnt-in sand, the defectives such as the case that rises, distortion, and the relative die model casting of surface quality of continuous castings is relatively poor.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of scrappage that both can reduce cast member, the cast member that while also can reduce after sintering is peeled off gradually, is more saved cost, has improved the lost foam paint compound method that is used for casting heat-resistant steel or wear-resisting alloy steel of production efficiency.
For achieving the above object, the technology used in the present invention solution is: a kind of lost foam paint compound method for casting heat-resistant steel or wear-resisting alloy steel is comprised of refractory material, suspending agent, other auxiliary agent and water;
Further instruction, the percentage by weight proportioning of described coating is: refractory material 60 ~ 70%, suspending agent 3 ~ 8%, other auxiliary agent 2 ~ 5%, all the other components are water;
described refractory material is: bauxite, great English powder, the magnesium powder, silica flour, brown alundum powder and white alundum powder form, granularity and mass percent proportioning are: bauxite-270 order ~-320 orders 78%, great English powder-200 order ~-270 orders 15%, magnesium powder-100 order ~-200 orders 5%, silica flour+100 Mu＜=2%, brown alundum powder-100 order ~-200 orders 5%, white alundum powder+100 Mu＜=2%, wherein brown alundum powder makes through 2000 ℃ ~ 2400 ℃ pyrolytic semltings take the magnesium vanadine as raw material, the white jade steel powder is to form through the electric smelting recrystallization with alumina powder, be fit to heat resisting steel, the evaporative pattern of the high temperature such as steel alloy cast uses, the great English chalk line coefficient of expansion is little, the heat good stability that shakes, refractoriness high and when high temperature to most of alloys chemically reactive not, the granularity of all the components and distribution of particle sizes are the key factors that affects coating density and gas permeability, lost foam paint particularly, can discharge smoothly by coating the thermal decomposition product of foamed coating model in sintering process material impact is arranged,
Described suspending agent is: the mass ratio of sodium bentonite in powder and the sodium cellulose glycolate aqueous solution is 1:1;
Described other auxiliary agent is: benzene emulsion or sulfate;
The density of described coating is 1.5 ~ 2.2 g/cm3, Fa Qi Liang＜=15 ml/g, and suspension was 99% in 24 hours.
Use principle of the present invention is: after coating is stirred, its bubble is coated on bubbles model, coat is 3 ~ 5 layers, specifically depending on foundry goods size, at last neat the putting on the top of the shelf of the bubbles model that coats is dried, and bake out temperature is 50 ~ 65 ℃.
The present invention has following beneficial effect in sum: the present invention has simplified production craft step with respect to other coating, effectively improve the intensity of coating, reduce dope layer due to bubbles model and easily come off in molten steel pouring course and form pigment finish leather, caused the defectives such as foundry goods bark pocket, slag inclusion, scab.
The invention specific embodiment
A kind of lost foam paint compound method for casting heat-resistant steel or wear-resisting alloy steel is comprised of refractory material, suspending agent, other auxiliary agent and water;
Further instruction, the percentage by weight proportioning of described coating is: refractory material 60 ~ 70%, suspending agent 3 ~ 8%, other auxiliary agent 2 ~ 5%, all the other components are water;
described refractory material is: bauxite, great English powder, the magnesium powder, silica flour, brown alundum powder and white alundum powder form, granularity and mass percent proportioning are: bauxite-270 order ~-320 orders 78%, great English powder-200 order ~-270 orders 15%, magnesium powder-100 order ~-200 orders 5%, silica flour+100 Mu＜=2%, brown alundum powder-100 order ~-200 orders 5%, white alundum powder+100 Mu＜=2%, wherein brown alundum powder makes through 2000 ℃ ~ 2400 ℃ pyrolytic semltings take the magnesium vanadine as raw material, the white jade steel powder is to form through the electric smelting recrystallization with alumina powder, be fit to heat resisting steel, the evaporative pattern of the high temperature such as steel alloy cast uses, the great English chalk line coefficient of expansion is little, the heat good stability that shakes, refractoriness high and when high temperature to most of alloys chemically reactive not, the granularity of all the components and distribution of particle sizes are the key factors that affects coating density and gas permeability, lost foam paint particularly, can discharge smoothly by coating the thermal decomposition product of foamed coating model in sintering process material impact is arranged,
Described suspending agent is: the mass ratio of sodium bentonite in powder and the sodium cellulose glycolate aqueous solution is 1:1;
Described other auxiliary agent is: benzene emulsion or sulfate;
The density of described coating is 1.5 ~ 2.2 g/cm3, Fa Qi Liang＜=15 ml/g, and suspension was 99% in 24 hours.
Use principle of the present invention is: after coating is stirred, its bubble is coated on bubbles model, coat is 3 ~ 5 layers, specifically depending on foundry goods size, at last neat the putting on the top of the shelf of the bubbles model that coats is dried, and bake out temperature is 50 ~ 65 ℃.
It should be noted that at last: above embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention; Therefore, although this specification has been described in detail the present invention with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can modify or be equal to replacement the present invention; And all do not break away from technical scheme and the improvement thereof of invention spirit and scope, and it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. lost foam paint compound method that is used for casting heat-resistant steel or wear-resisting alloy steel, by refractory material, suspending agent, other auxiliary agent and water form, it is characterized in that being: the percentage by weight proportioning of described coating is refractory material 60 ~ 70%, suspending agent 3 ~ 8%, other auxiliary agent 2 ~ 5%, all the other components are water, described refractory material is bauxite, great English powder, the magnesium powder, silica flour, brown alundum powder and white alundum powder form, granularity and mass percent proportioning are bauxite-270 order ~-320 orders 78%, great English powder-200 order ~-270 orders 15%, magnesium powder-100 order ~-200 orders 5%, silica flour+100 Mu＜=2%, brown alundum powder-100 order ~-200 orders 5%, white alundum powder+100 Mu＜=2%, described suspending agent is that the mass ratio of sodium bentonite in powder and the sodium cellulose glycolate aqueous solution is 1:1, described other auxiliary agent is benzene emulsion or sulfate.
2. be used for according to claim 1 the lost foam paint compound method of casting heat-resistant steel or wear-resisting alloy steel, it is characterized in that being: the density of described coating is 1.5 ~ 2.2 g/cm3, Fa Qi Liang＜=15 ml/g, and suspension was 99% in 24 hours.
3. be used for according to claim 1 the lost foam paint compound method of casting heat-resistant steel or wear-resisting alloy steel, it is characterized in that being: described coating coat is 3 ~ 5 layers, and the bake out temperature of the bubbles model that coats is 50-65 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310034751.0A CN103084540B (en) | 2013-01-30 | 2013-01-30 | A kind of lost foam paint compound method for casting heat-resistant steel or wear-resisting alloy steel |
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| CN201310034751.0A CN103084540B (en) | 2013-01-30 | 2013-01-30 | A kind of lost foam paint compound method for casting heat-resistant steel or wear-resisting alloy steel |
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| CN103084540A true CN103084540A (en) | 2013-05-08 |
| CN103084540B CN103084540B (en) | 2015-12-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286258A (en) * | 2013-06-24 | 2013-09-11 | 朱小英 | Low-cost high-performance lost foam casting coating |
| CN105268911A (en) * | 2015-10-27 | 2016-01-27 | 宁夏共享化工有限公司 | High-breathability lost foam coating and preparing method thereof |
| CN105964899A (en) * | 2016-07-20 | 2016-09-28 | 张耀忠 | Water-based casting coating |
| TWI628015B (en) * | 2014-08-18 | 2018-07-01 | 神戶製鋼所股份有限公司 | Disappearing model casting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060814A1 (en) * | 1999-06-14 | 2000-12-20 | General Motors Corporation | Removing lost foam pattern coating residue from a casting |
| JP2003290874A (en) * | 2002-04-08 | 2003-10-14 | Kao Corp | Lost pattern casting method |
| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
| CN102407275A (en) * | 2011-04-25 | 2012-04-11 | 湖北工业大学 | Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof |
-
2013
- 2013-01-30 CN CN201310034751.0A patent/CN103084540B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1060814A1 (en) * | 1999-06-14 | 2000-12-20 | General Motors Corporation | Removing lost foam pattern coating residue from a casting |
| JP2003290874A (en) * | 2002-04-08 | 2003-10-14 | Kao Corp | Lost pattern casting method |
| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
| CN102407275A (en) * | 2011-04-25 | 2012-04-11 | 湖北工业大学 | Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286258A (en) * | 2013-06-24 | 2013-09-11 | 朱小英 | Low-cost high-performance lost foam casting coating |
| TWI628015B (en) * | 2014-08-18 | 2018-07-01 | 神戶製鋼所股份有限公司 | Disappearing model casting method |
| CN105268911A (en) * | 2015-10-27 | 2016-01-27 | 宁夏共享化工有限公司 | High-breathability lost foam coating and preparing method thereof |
| CN105964899A (en) * | 2016-07-20 | 2016-09-28 | 张耀忠 | Water-based casting coating |
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| CN103084540B (en) | 2015-12-23 |
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Granted publication date: 20151223 Termination date: 20190130 |