CN101954445A - Foam pattern surface film forming method for lost foam casting - Google Patents
Foam pattern surface film forming method for lost foam casting Download PDFInfo
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- CN101954445A CN101954445A CN 201010292109 CN201010292109A CN101954445A CN 101954445 A CN101954445 A CN 101954445A CN 201010292109 CN201010292109 CN 201010292109 CN 201010292109 A CN201010292109 A CN 201010292109A CN 101954445 A CN101954445 A CN 101954445A
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Abstract
The invention relates to a foam pattern surface film forming method for lost foam casting, belonging to a lost foam casting method, and solving the problems that the film forming matter of the current foam pattern surface film forming method has longer film forming time and high cost. The method of the invention comprises the following steps: (1) a film forming matter preparing step: preparing a wax-based organic composite material of which the raw materials in mass percent are as follows: 60%-100% of wax, 0%-40% of stearic acid and 0%-10% of additives, wherein the range of melting point of the wax-based organic composite material is 40 DEG C-70 DEG C, and then heating to meld the composite material to form mixture; and (2) a film forming step: completely soaking the foam pattern into the mixture and soaking for 5-60s, and then taking out and slightly shaking or whipping to remove the excess liquid mixture, and after cooling, an even film layer is formed on the foam pattern. The invention has simple operation, short film forming time and lower cost, and can greatly improve the surface quality of the foam pattern, thereby improving the surface qualities of a mold shell and casting, and realizing large-scale industrial production.
Description
Technical field
The invention belongs to disappearance formwork mold casting method, be specifically related to a kind of Foam Pattern surface filming method of the formwork mold casting that is used to disappear, be used to improve disappearance formwork type surface quality of continuous castings.
Background technology
21 century foundry goods development is towards trend such as near-net-shapeization, precise treatment, integrations, and this just requires foundry goods to use less or without machined, can an Accurate Shaping, thus reduce work hours, reduce cost, enhance productivity and benefit.
Lost foam casting is the technology of a kind of nearly no surplus, Accurate Shaping, and the lost foam mould cost is low, structural design flexible, can produce big part etc., is called as " casting technology of 21 century ".Yet, the decomposition of the Foam Pattern of lost foam casting in casting process can bring pore, elephant skin, be mingled with and defectives such as carburetting, also can make pouring temperature higher, especially liquid aluminium (magnesium) alloy oxidation, burning, air-breathing obvious aggravation cause cast properties on the low side.At above problem, disappearance formwork mold casting arises at the historic moment, and it is lost foam casting to be combined with model casting develop a kind of new composite casting technology that forms, adopt Foam Pattern, on the foam mould, crust, after losing the mould roasting, obtain precision casting thereby pour into a mould.This technology has following advantage: the Foam Pattern structural design flexibly, dimensionally stable, contraction is little, cost is low, can produce medium-and-large-sized complicated precision casting; Owing to slough Foam Pattern before the cast, pore, the elephant skin that the die casting of can avoiding disappearing is prone to, be mingled with and defective such as carburetting; Overcome model casting and can not be used for big part and the high deficiency of cost.The surface roughness of disappearance formwork type foundry goods can reach 3.2-6.3 μ m, yet the surface quality of comparing this type of foundry goods of precision-investment casting (Ra 1.6-3.2 μ m) also has certain gap.This mainly is that coating infiltrates groove between bead easily when the dip-coating material, thereby influences shell surface quality (see figure 2), and finally influences surface quality of continuous castings owing to have line net groove (see figure 1) between the bead of foam mould surface.Therefore, if further improve the surface quality of disappearance formwork type foundry goods, must solve the problem that foam mould bead inter-drain troughed belt comes.
At present, in order to eliminate groove between foam mould bead, improve foam mould surface quality, the someone studies Foam Pattern surface filming method both at home and abroad, earlier at the Foam Pattern surface filming, adopt the film forming matter of any surface finish agent such as celluloid, polyvinyl butyral, polyvinyl acetate as the foam mould, yet because wherein the best celluloid film forming of film-formation result is as solvent with ethanol, its dry run needs ethanol progressively to volatilize, film formation time is grown (greater than 5h) and is cost an arm and a leg, and therefore is difficult to realize large-scale production application.
Summary of the invention
The invention provides a kind of Foam Pattern surface filming method of the formwork mold casting that is used to disappear, solve in the existing Foam Pattern surface filming method, the long and expensive problem of the film forming matter film formation time of foam mould, by improving foam mould surface quality, and then improve shell and surface quality of continuous castings.
The Foam Pattern surface filming method of a kind of formwork mold casting that is used to disappear of the present invention comprises film forming matter preparation steps and film forming step, it is characterized in that:
One. the film forming matter preparation steps: preparation cerul organic composite material, its raw material mass percent is: wax 60%～100%, stearic acid 0%～40%, additives 0%～10%, cerul organic composite material melting range are 40 ℃～70 ℃; Described additives is polyethylene, ethene and vinyl acetate copolymer resins (EVA) or rosin;
Cerul organic composite material heat fused is made it form immiscible material, heating-up temperature is 60～80 ℃ again;
Two. film forming step: Foam Pattern is immersed described immiscible material fully, take out and slight jitter or whipping behind immersion 5～60s,, promptly on Foam Pattern, form even rete after the cooling to remove unnecessary liquid immiscible material.
Described Foam Pattern surface filming method is characterized in that:
In the described film forming matter preparation steps, described wax is paraffin, ceresine or river wax.
Described Foam Pattern surface filming method is characterized in that:
In the described film forming step, Foam Pattern is immersed described immiscible material fully before be heated 20～70 ℃ of heating-up temperatures earlier.
Described Foam Pattern surface filming method is characterized in that:
In the described film forming step, the foaming material of described Foam Pattern is expandable polystyrene resin bead, expandability methymethacrylate and styrene copolymerized resin bead or expandability polymethyl methacrylate resin beads.
The present invention adopts the cerul organic composite material to form the bright and clean thin layer of layer of even on the foam mould surface that disappearance formwork mold casting is used, come groove between filled and process mould bead, and then raising disappearance formwork type surface quality of continuous castings, operate comparatively simple, film formation time reduces (less than 10min) greatly, and cost is lower.Can eliminate groove between foam mould bead preferably to the influence of foam mould surface quality, and not influence the dimensional accuracy of foam mould, can improve the surface quality of foam mould greatly, and then improve the surface quality of shell and foundry goods.The present invention and filming performance celluloid preferably become the mould material to compare, the surface quality of continuous castings that obtains suitable with it, surface roughness can reach 1.6～3.2 μ m, near the model casting level, the shell mould of utilizing the present invention to obtain can be carried out gravitational casting, also can carry out castings such as low pressure, differential pressure, suction pouring, the hot investment casting that can be used in non-ferrous alloys such as black alloy such as cast steel, cast iron and aluminium, magnesium, titanium is shaped, and can realize large-scale industrial production.
Description of drawings
Fig. 1 is the Foam Pattern surface picture; Groove between bead;
Fig. 2 shell surface topography photo;
Fig. 3 is the surface picture of Foam Pattern after the present invention handles;
Fig. 4 handles the resulting shell surface topography of Foam Pattern photo for using the present invention.
The specific embodiment
The present invention is further described below in conjunction with embodiment.
Embodiment 1, and order comprises:
One. the film forming matter preparation steps: preparation cerul organic composite material, its raw material mass percent is: paraffin 100%, all the other are 0; Cerul organic composite material melting range is 40 ℃;
Cerul organic composite material heat fused is made it form immiscible material, heating-up temperature is 60 ℃ again;
Two. film forming step: not heated Foam Pattern is immersed described immiscible material fully, take out and slight jitter or whipping after soaking 5s, to remove unnecessary liquid immiscible material, promptly on Foam Pattern, form even rete after the cooling, see shown in Figure 3, foam mould surface forms the layer of smooth thin layer, and the groove between foam mould bead is filled.
In the film forming step, the foaming material of described Foam Pattern is the expandable polystyrene resin bead.
Embodiment 2, and order comprises:
One. the film forming matter preparation steps: preparation cerul organic composite material, its raw material mass percent is: ceresine 80%, stearic acid 15%, polyethylene 5%, cerul organic composite material melting range is 55 ℃;
Cerul organic composite material heat fused is made it form immiscible material, heating-up temperature is 70 ℃ again;
Two. the film forming step: the Foam Pattern that will heat 20 ℃ immerses described immiscible material fully, take out and slight jitter or whipping after soaking 35s, to remove unnecessary liquid immiscible material, promptly on Foam Pattern, form even rete after the cooling, utilize photo that this Foam Pattern obtains shell as shown in Figure 4, the shell surface finishing, the surface quality that more undressed Foam Pattern obtains the shell (see figure 2) improves greatly.
In the film forming step, the foaming material of described Foam Pattern is expandability methymethacrylate and styrene copolymerized resin bead.
Embodiment 3, and order comprises:
One. the film forming matter preparation steps: preparation cerul organic composite material, its raw material mass percent is: river wax 60%, stearic acid 30%, rosin 10%, cerul organic composite material melting range is 70 ℃;
Cerul organic composite material heat fused is made it form immiscible material, heating-up temperature is 80 ℃ again;
Two. the film forming step: the Foam Pattern that will heat 70 ℃ immerses described immiscible material fully, take out and slight jitter or whipping after soaking 60s, to remove unnecessary liquid immiscible material, promptly on Foam Pattern, form even rete after the cooling, obtaining surface roughness Ra is 1.9 μ m.
In the film forming step, the foaming material of described Foam Pattern is an expandability polymethyl methacrylate resin beads.
Claims (5)
1. the Foam Pattern surface filming method of the formwork mold casting that is used to disappear comprises film forming matter preparation steps and film forming step, it is characterized in that:
One. the film forming matter preparation steps: (1) preparation cerul organic composite material, its raw material mass percent is: wax 60%～100%, stearic acid 0%～40%, additives 0%～10%, cerul organic composite material melting range are 40 ℃～70 ℃; (2) cerul organic composite material heat fused is made it form immiscible material, heating-up temperature is 60～80 ℃ again; Described additives is polyethylene, ethene and vinyl acetate copolymer resins or rosin;
Two. film forming step: Foam Pattern is immersed described immiscible material fully, take out and slight jitter or whipping behind immersion 5～60s,, promptly on Foam Pattern, form even rete after the cooling to remove unnecessary liquid immiscible material.
2. Foam Pattern surface filming method as claimed in claim 1 is characterized in that:
In the described film forming matter preparation steps, the described wax that is mixed with membrane substance is paraffin, ceresine or river wax.
3. Foam Pattern surface filming method as claimed in claim 1 or 2 is characterized in that:
In the described film forming step, Foam Pattern is immersed described immiscible material fully before be heated 20～70 ℃ of heating-up temperatures earlier.
4. Foam Pattern surface filming method as claimed in claim 1 or 2 is characterized in that:
In the described film forming step, the foaming material of described Foam Pattern is expandable polystyrene resin bead, expandability methymethacrylate and styrene copolymerized resin bead or expandability polymethyl methacrylate resin beads.
5. Foam Pattern surface filming method as claimed in claim 3 is characterized in that:
In the described film forming step, the foaming material of described Foam Pattern is expandable polystyrene resin bead, expandability methymethacrylate and styrene copolymerized resin bead or expandability polymethyl methacrylate resin beads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102921099A CN101954445B (en) | 2010-09-27 | 2010-09-27 | Foam pattern surface film forming method for lost foam casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102921099A CN101954445B (en) | 2010-09-27 | 2010-09-27 | Foam pattern surface film forming method for lost foam casting |
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| CN101954445A true CN101954445A (en) | 2011-01-26 |
| CN101954445B CN101954445B (en) | 2012-03-07 |
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| CN2010102921099A Expired - Fee Related CN101954445B (en) | 2010-09-27 | 2010-09-27 | Foam pattern surface film forming method for lost foam casting |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179474A (en) * | 2011-04-13 | 2011-09-14 | 于永波 | Template for casting iron alloy ball with lost foam method |
| CN104209460A (en) * | 2013-06-02 | 2014-12-17 | 黄开午 | V-process casting soaking film-forming method |
| CN107723530A (en) * | 2017-08-31 | 2018-02-23 | 宁波市佳利来机械制造有限公司 | A kind of automobile transmission body |
| CN109317606A (en) * | 2018-11-23 | 2019-02-12 | 安徽应流铸业有限公司 | A kind of lost foam pattern processing method |
| CN109550891A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | A kind of lathe bed evaporative pattern and its method for pouring lathe bed |
| CN111451441A (en) * | 2020-04-30 | 2020-07-28 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3619170A1 (en) * | 1986-06-06 | 1987-12-10 | Basf Ag | Use of polystyrene foam as lost pattern in the production of metal castings |
| US5290373A (en) * | 1993-04-23 | 1994-03-01 | Brunswick Corporation | Evaporable foam casting system utilizing an aluminum-silicon alloy containing a high magnesium content |
| EP0768129A1 (en) * | 1995-10-12 | 1997-04-16 | Toyota Jidosha Kabushiki Kaisha | Parting agent for die-casting |
| CN101332501A (en) * | 2008-07-25 | 2008-12-31 | 泰州市永昌冶金设备有限公司 | Vacuum negative-pressure los mould casting technique |
-
2010
- 2010-09-27 CN CN2010102921099A patent/CN101954445B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3619170A1 (en) * | 1986-06-06 | 1987-12-10 | Basf Ag | Use of polystyrene foam as lost pattern in the production of metal castings |
| US5290373A (en) * | 1993-04-23 | 1994-03-01 | Brunswick Corporation | Evaporable foam casting system utilizing an aluminum-silicon alloy containing a high magnesium content |
| EP0768129A1 (en) * | 1995-10-12 | 1997-04-16 | Toyota Jidosha Kabushiki Kaisha | Parting agent for die-casting |
| CN101332501A (en) * | 2008-07-25 | 2008-12-31 | 泰州市永昌冶金设备有限公司 | Vacuum negative-pressure los mould casting technique |
Non-Patent Citations (1)
| Title |
|---|
| 《材 料 科 学 与 工 程 学 报》 20050630 董选普等 "镁合金消失模铸件表面膜成分及其结构" 349-353 1-5 第23卷, 第3期 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179474A (en) * | 2011-04-13 | 2011-09-14 | 于永波 | Template for casting iron alloy ball with lost foam method |
| CN104209460A (en) * | 2013-06-02 | 2014-12-17 | 黄开午 | V-process casting soaking film-forming method |
| CN107723530A (en) * | 2017-08-31 | 2018-02-23 | 宁波市佳利来机械制造有限公司 | A kind of automobile transmission body |
| CN109550891A (en) * | 2017-09-25 | 2019-04-02 | 高淳县龙宁精密铸造有限公司 | A kind of lathe bed evaporative pattern and its method for pouring lathe bed |
| CN109317606A (en) * | 2018-11-23 | 2019-02-12 | 安徽应流铸业有限公司 | A kind of lost foam pattern processing method |
| CN111451441A (en) * | 2020-04-30 | 2020-07-28 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
| CN111451441B (en) * | 2020-04-30 | 2021-11-12 | 河南天缘精工模具有限公司 | Method for improving surface smoothness of lost foam hollow shell casting |
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| CN101954445B (en) | 2012-03-07 |
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