CN85108358A - Precoated sand and process for making shell thereof - Google Patents
Precoated sand and process for making shell thereof Download PDFInfo
- Publication number
- CN85108358A CN85108358A CN85108358.7A CN85108358A CN85108358A CN 85108358 A CN85108358 A CN 85108358A CN 85108358 A CN85108358 A CN 85108358A CN 85108358 A CN85108358 A CN 85108358A
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- precoated sand
- coating
- graphite
- sand
- shell
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Abstract
A kind of precoated sand of moltening mold castings, it is on the surface of graphite sand grains, is coating a kind of curing agent of being made up of p-methyl benzenesulfonic acid and ethanolic solution, drying forms.
With the sanding material of said precoated sand as investment shell.After module hangs up graphite-ZTS type cold coating.Different requirements according to surface layer, transition zone and back-up coat sprinkle varigrained precoated sand.After the dry sclerosis, spread the second layer, the 3rd layer again ... until reaching designing requirement.
Description
The present invention is applicable to titanium alloy model casting.
Graphite-phenolic resins shell is adopted in titanium alloy model casting at present mostly, promptly adopts phenolic resins (making binding agent) and graphite powder (making refractory aggregate) to be mixed with coating, makes sanding material with the graphite sand of the different trades mark.For making graphite-phenolic resins shell sclerosis, the curing agent methenamine is joined in the coating, methenamine directly contacts with phenolic resins and condensation reaction takes place, and the polymer that forms irreversible reaction just bonds graphite sand, forms the fastening shell of one deck.Because the adding of methenamine was condensed to the storage period of coating 1 day,, then stand-by coating need be put into refrigerator and store if will prolong the coating storage period.When needing to hang coating, again coating is slowly given heat to about 20 ℃.Like this, complex process, and also the firm time of shell is long again.Shell is formed by 7～9 layers, and every layer of firm time is 9～24 hours.
The present invention is intended to make the technology of a kind of precoated sand and the said precoated sand system shell of a kind of usefulness of design.
So-called precoated sand is exactly that the p-methyl benzenesulfonic acid curing agent is coated on the graphite sand grains of the different trades mark through overmulling system.Precoated sand has just become the carrier of curing agent.When being sprinkling upon precoated sand on the coating that module hangs, the curing agent on sand grains top layer contacts with resin in the coating, and condensation reaction takes place, and the polymer that forms irreversible reaction just bonds sand grains, forms the fastening shell of one deck.Repeated multiple times just can be produced the investment shell of cast titanium or titanium alloy like this.
Adopt the advantage of precoated sand sclerosis shell as follows:
(1) agent that is cured of graphite sand grains encases, and does not have dust during stucco.
(2) do not add curing agent in the required graphite ZTS type cold coating, so the storage period of coating is long, coating can use continuously.
(3) shortened the fabrication cycle of shell, the firm time of every stratotype shell became 2～6 hours by original 9～24 hours.
Now preparation method and the process for making shell with precoated sand is described in detail as follows:
(1) preparation technology of precoated sand
Curing agent is the p-methyl benzenesulfonic acid ethanolic solution, and its proportioning is:
P-methyl benzenesulfonic acid: ethanol=1～2: 1
P-methyl benzenesulfonic acid is dissolved in the ethanolic solution fully, be mixed with curing agent, curing agent is added in the blade paddle mixer that fills graphite sand lentamente again, add while stirring, configuration proportion sees Table 1.The system of mixing 10 minutes, the graphite sand that will mix again after the system is put into baking oven, is heated to 80～90 ℃ of insulations 1～2 hour, the cooling back precoated sand.
The configuration proportion of table 1 precoated sand
(2) process for making shell
Module is immersed in graphite-ZTS type cold coating, more unnecessary coating on the module is got rid of only, the different requirements according to surface layer, transition zone and back-up coat sprinkle varigrained precoated sand, place air dry, and shell is solidified.Be coated with the extension number of plies according to what the concrete condition of foundry goods was determined shell.Can be coated with the extension second layer after the ground floor sclerosis, until reaching design object.
Claims (3)
1, a kind of titanium alloy moltening mold castings precoated sand; It is characterized in that coating one deck curing agent on the surface of the graphite sand of different grain size.
2, said curing agent in the claim 1, its composition is p-methyl benzenesulfonic acid and ethanol.
3, manufacture the shell of moltening mold castings with said precoated sand in the claim 1; It is characterized in that module is immersed in graphite-ZTS type cold coating, take out module, get rid of clean unnecessary coating, the different requirements by surface layer, transition zone and back-up coat sprinkle varigrained precoated sand, place and treat air dry.After the ground floor sclerosis, hang the second layer again, until reaching design object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108358 CN1011493B (en) | 1985-11-05 | 1985-11-05 | Overcoating sand for moltening mold casting and process for making shell therefrom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108358 CN1011493B (en) | 1985-11-05 | 1985-11-05 | Overcoating sand for moltening mold casting and process for making shell therefrom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85108358A true CN85108358A (en) | 1987-05-13 |
| CN1011493B CN1011493B (en) | 1991-02-06 |
Family
ID=4795992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85108358 Expired CN1011493B (en) | 1985-11-05 | 1985-11-05 | Overcoating sand for moltening mold casting and process for making shell therefrom |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011493B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328034A (en) * | 2011-10-17 | 2012-01-25 | 中钢集团邢台机械轧辊有限公司 | Cold type coated sand paint coating process for casting |
| CN102728778A (en) * | 2012-07-12 | 2012-10-17 | 西安泵阀总厂有限公司 | Sand mould casting process for titanium and titanium alloy castings |
| CN105903901A (en) * | 2016-05-13 | 2016-08-31 | 上海万泽精密铸造有限公司 | Near-zero shrinkage rate molding shell based on fused quartz and preparation method thereof |
| CN107803458A (en) * | 2017-11-16 | 2018-03-16 | 嘉善鑫海精密铸件有限公司 | A kind of application of new material carburant in investment casting casing |
-
1985
- 1985-11-05 CN CN 85108358 patent/CN1011493B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328034A (en) * | 2011-10-17 | 2012-01-25 | 中钢集团邢台机械轧辊有限公司 | Cold type coated sand paint coating process for casting |
| CN102728778A (en) * | 2012-07-12 | 2012-10-17 | 西安泵阀总厂有限公司 | Sand mould casting process for titanium and titanium alloy castings |
| CN102728778B (en) * | 2012-07-12 | 2015-02-11 | 西安泵阀总厂有限公司 | Sand mould casting process for titanium and titanium alloy castings |
| CN105903901A (en) * | 2016-05-13 | 2016-08-31 | 上海万泽精密铸造有限公司 | Near-zero shrinkage rate molding shell based on fused quartz and preparation method thereof |
| CN105903901B (en) * | 2016-05-13 | 2018-09-07 | 上海万泽精密铸造有限公司 | A kind of nearly zero-shrinkage shell and preparation method thereof based on vitreous silica |
| CN107803458A (en) * | 2017-11-16 | 2018-03-16 | 嘉善鑫海精密铸件有限公司 | A kind of application of new material carburant in investment casting casing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1011493B (en) | 1991-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |