CN1014686B - Productive method of sand core for investment casting - Google Patents
Productive method of sand core for investment castingInfo
- Publication number
- CN1014686B CN1014686B CN 88109008 CN88109008A CN1014686B CN 1014686 B CN1014686 B CN 1014686B CN 88109008 CN88109008 CN 88109008 CN 88109008 A CN88109008 A CN 88109008A CN 1014686 B CN1014686 B CN 1014686B
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- CN
- China
- Prior art keywords
- core
- sand
- grams
- refractory material
- gram
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Mold Materials And Core Materials (AREA)
Abstract
The present invention relates to a method for producing sand cores for investment casting by hardening with CO2 based on water glass. The sand core is provided with silica sol and polyvinyl chloride paste resin, and fireproofing material paint of zircon sand is painted on the outer surface of the sand core which is hardened by CO2. The sand core has the advantages of higher water resistance and moderate temperature strength, stable shaping and easy store, and the poured sand core has the advantages of good collapsibility, easy sand removal and thorough sand removal.
Description
The invention belongs to a kind of casting technique, specifically is the production method of sand core for investment casting.
The production method of known formation investment-casting wax-pattern inner chamber mainly is to be shaped by the core that is arranged on the die mould.But, then can adopt the molten core method that in wax-pattern, discharges water in advance, wax-pattern combined method and change the combination, extraction form etc. of die mould core for having the crooked or interior big outer little wax-pattern inner chamber of shape.Though these methods can solve complicated inner cavity shaping problem on the wax-pattern, can not solve the difficulty that its inner chamber shell is shaped, can not solve the sand removal difficulty of these complicated inner cavities.At present for solving the shaping difficulty of investment shell intracavity, can adopt the method for being put ceramic core or quartz glass core when the compacting wax-pattern, this core is the manufacturing process complexity not only, and cost is too high, do not fit into the requirement of common engineering foundry goods, this in addition core sand removal is difficult too.For this reason, the employing that has the glass resin core technology that in wax-pattern, discharges water in advance, but its waterglass of selecting for use is high mode, the core sand wet strength is low, demoulding difficulty, and be difficult to deposit must have the holder of supporting plate pad during depanning in addition, also can't be shaped to many special shapes, can not satisfy the needs that wax-pattern in enormous quantities is produced.
The purpose of this invention is to provide and a kind of all kinds of difform complicated investment shell intracavities are had good mouldability, and have better water-resistance and a higher medium temperature intensity, sand removal is easy to the production method of sand core for investment casting.
The object of the present invention is achieved like this: with SiO
2Content is 98%(weight %) above quartz sand 95-99 part and granularity be that the dried even back that is mixed of 200 purpose one-level bauxite 1-4 parts adds 1-5%(and accounts for refractory material gross weight %) polyethylene sticks with paste and uses the property mixed with resin even, adding 1-5%(then and account for refractory material gross weight %) the dibutyl phthalate mixed grind is even, add again by low modulus water glass and Ludox by the modified water glass 6-8%(refractory material gross weight % that forms at 3: 1) mixed grind evenly forms waterglass base polyvinyl chloride resin sand in the back.With this sand coremaking, logical CO
2After the sclerosis, get core finishing, through 180-200 ℃ of oven dry core to buff, core outer surface brushing fireproof coating after the model inspection again, its fireproof coating prescription is as follows:
320 order zirconium English powder, 1000 grams
Ludox 700-900 gram
Phenolic aldehyde hybrid resin 1-10 gram
Organobentonite 50-100 gram
Sanlose 5 grams
Fatty alcohol polyoxy ethylether 0.05-0.1%(accounts for above-mentioned material weight %) n-octyl alcohol 0.003-0.006%(accounts for above-mentioned material weight %)
Brushed with after coating, natural air drying again through 110-140 ℃ of oven dry, was deposited after the reconditioning 24 hours, can drop into wax-pattern production.
Advantage of the present invention and good effect are: model casting and sand casting, waterglass and the diverse technology of organic thermoplastic resin two classes are respectively got its length and are fused to one again, are used for smart casting and produce.Not only solve the casting accuracy of complicated inner cavity, and solved the coating extension sand of little revolution section and the sand removal difficulty after the cast.Casting yield can be reached more than 85%.
The present invention adopts low modulus water glass to add the binding agent of the modified water glass of Ludox as core.As waterglass CO
2Generate SiO during sclerosis
2Colloidal particles and Na
2CO
3, and be mixed with dehydration, make the SiO in the Ludox
2Particle is easy to coagulation, forms the different SiO of two kinds of granularities in the core after sclerosis
2Interparticle mutual iron chains embedding becomes fine and close three-dimensional space network, has improved the water-resistance and the medium temperature intensity of core, because low modulus Na in the glass not
2O content height has increased the stability of Ludox, has also improved the property deposited of core sand.
In the modified water glass core sand, add the polyvinyl chloride thermoplastic resin, can between sand grains, form the micelle network between the powder, not only improve sand core strength, increased core toughness, water-resistance, and in the intensification degradation process, decomposite a large amount of HCl, make the Na in the waterglass
2O is neutralized in a large number, has quickened the sclerosis of core and has impelled the core sclerosis fully.For preventing that thermoplastic polyvinyl chloride's resin from causing core distortion in the thermoplasticity under the dewaxing temperature, added the wet strength that bauxite improves core.
Along with the pyrolysis of Corvic generates a large amount of HCl gas and various saturated and unsaturation hydrocarbon mixture gas, produce the pinhole that is evenly distributed after making core produce give vent to anger capillary channel and roasting.And along with the raising of sintering temperature with keep this pinhole rate to increase, burn the soaking and scattering quality of annotating the back cores thereby improved, help sand removal.
Most preferred embodiment of the present invention is:
1, example foundry goods feature
Investment-casting title high pressure thermodynamic trap valve body (Dg15-Dg50)
Castings material stainless steel EG
3Cr
13
Casting weight 0.74-4kg
Casting structure characteristics profile is two skewed crossing cylindrical shells, and its outer wall need cast out 0.8 mm wide and high font and mark, and 360 ° of annular revolution steam passages of cross dimensions 8 * 8-10 * 20 millimeter are arranged at inner chamber top, and the inner chamber bottom is interior big outer little inclined hole.(as shown in drawings)
2, example implementation process:
Wax-pattern and investment shell intracavity are made up of annular core and oblique core respectively.Its core sand prescription is:
Quartz sand (50/100 order) 96-99 part
One-level bauxite (200 order) 1-3 part
Welvic accounts for refractory material weight % with property resin 1.5-3%() dibutyl phthalate 1-3%(accounts for refractory material weight %) modified water glass (with Ludox: M=2.2-2.5 waterglass=be made at 1: 3) 6-8%(accounts for refractory material weight %)
Each component of core sand adds and mixed grind is in proper order:
Do to mix to do in 2 minutes and mix 1 minute mixed grind 3 minutes mixed grind 5 minutes again
The dress polybag is deposited (can deposit 24-48 hour).
The prefabricated metal-cored dish that meets the core shape.Above-mentioned core sand put into hit reality, can straighten footpath 1-2 millimeter iron wire to the toroidal cores turning is arbor, logical CO
2Core is taken out in the sclerosis back, and recontour.
Dry in the far infrared core oven, baking temperature is 180-200 ℃, is incubated 1-2 hour, and core dries by the fire to buff, takes out cooling after model is checked, and the brushing fireproof coating, and the fireproof coating prescription is:
Zirconium English powder 1000 grams
Ludox 800-850 gram
Phenolic aldehyde hybrid resin 5 grams
Organobentonite 70 grams
Sanlose 5 grams
Fatty alcohol polyoxy ethylether 2 grams
N-octyl alcohol 0.5-1 gram
Behind the core natural air drying, through secondary drying, baking temperature is 110-140 ℃, behind the reconditioning edge, deposits 24 hours, finishes the core technical process, changes system wax-pattern operation over to.
In the molding core is placed in the die mould, presses wax-pattern routinely, repair a die, assemble module.System shell, dewaxing, formation has the shell of core, and to carry out routinely after the roasting temperature be that 1580-1620 ℃ molten stainless steel implantation temperature is in 500-550 ℃ the shell, afterwards, foundry goods is through the sand removal of shake shell, core cavity core stain looses after 30 seconds, and cutting is watered then, annealing and soak cleaning, sandblast, finishing, check and become casting finished products.
Claims (2)
1, a kind of waterglass base-CO
2The production method of the sand core for investment casting of sclerosis is characterized in that: with SiO
2Content is that above quartz sand 95-99 part of 98% (weight %) and granularity are that dried even back adding 1-5% (the refractory material gross weight %) Welvic that is mixed of 200 purpose one-level bauxite 1-4 parts is even with the property mixed with resin, it is even to add 1-5% (refractory material gross weight %) dibutyl phthalate mixed grind then, add again by low modulus water glass and Ludox and evenly form waterglass base polyvinyl chloride fat sand in the back by modified water glass 6-8% (the refractory material gross weight %) mixed grind of forming at 3: 1, with this sand coremaking, logical CO
2After the sclerosis, get core finishing, through 180-200 ℃ of oven dry core to buff, the core outer surface brushing fireproof coating after model is checked, its fireproof coating prescription is as follows:
320 order zirconium English powder, 1000 grams
Ludox 700-900 gram
Phenolic aldehyde hybrid resin 1-10 gram
Organobentonite 50-100 gram
Sanlose 5 grams
Fatty alcohol polyoxy ethylether 0.05-0.1% (accounting for above-mentioned material weight %) n-octyl alcohol 0.003-0.006% (accounting for above-mentioned material weight %)
Core after the brushing again through 110-140 ℃ of oven dry, was deposited after the reconditioning 24 hours behind natural air drying.
2, by the described production method of claim 1, it is characterized in that: the core sand prescription can be: quartz sand (50/100 order) 96-99 part: one-level bauxite (200 order) 1-3 part; Welvic accounts for refractory material weight % with property resin 1.5-3%(); Dibutyl phthalate (DBP) 1-3%(accounts for refractory material weight %); Modified water glass (with Ludox: M=2.2-2.5 waterglass=1: 3) 6-8%(accounts for refractory material weight %).
The fireproof coating prescription can be: zircon sand 1000 grams, Ludox 800-850 gram, phenolic aldehyde hybrid resin 5 grams, organobentonite 70 grams, sanlose 5 grams, fatty alcohol polyoxy ethylether 2 grams, n-octyl alcohol 0.5-1 gram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109008 CN1014686B (en) | 1988-09-30 | 1988-09-30 | Productive method of sand core for investment casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109008 CN1014686B (en) | 1988-09-30 | 1988-09-30 | Productive method of sand core for investment casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041300A CN1041300A (en) | 1990-04-18 |
| CN1014686B true CN1014686B (en) | 1991-11-13 |
Family
ID=4835303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88109008 Expired CN1014686B (en) | 1988-09-30 | 1988-09-30 | Productive method of sand core for investment casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014686B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101360574B (en) * | 2005-11-21 | 2010-09-08 | 新东工业株式会社 | Process for making molds |
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| CN1074326C (en) * | 1997-11-26 | 2001-11-07 | 北京航空航天大学 | Process for making cores for casting process |
| CN1305600C (en) * | 2004-10-18 | 2007-03-21 | 中铁宝桥股份有限公司 | Water glass and resin mixed CO2 hardening method |
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| DE112014002572T5 (en) * | 2013-05-29 | 2016-03-17 | Mitsubishi Heavy Industries, Ltd. | Investment casting core, method for producing a investment casting core, and investment casting tool |
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| CN109848371B (en) * | 2018-11-29 | 2021-04-02 | 奥夫尔科精铸机械（昆山）有限公司 | Compressor shell forming method and compressor |
| CN112045146A (en) * | 2020-08-25 | 2020-12-08 | 含山县能华铸造有限公司 | Method for improving suspension stability of casting coating |
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| CN117383947B (en) * | 2023-09-19 | 2024-07-30 | 东风精密铸造有限公司 | Self-hardening core material without heating and preparation method thereof |
-
1988
- 1988-09-30 CN CN 88109008 patent/CN1014686B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101360574B (en) * | 2005-11-21 | 2010-09-08 | 新东工业株式会社 | Process for making molds |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1041300A (en) | 1990-04-18 |
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