CN104338901A - Method for repairing precise investment casting silica sol mold shell and mold shell wax outlet plugging material - Google Patents
Method for repairing precise investment casting silica sol mold shell and mold shell wax outlet plugging material Download PDFInfo
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- CN104338901A CN104338901A CN201410565438.4A CN201410565438A CN104338901A CN 104338901 A CN104338901 A CN 104338901A CN 201410565438 A CN201410565438 A CN 201410565438A CN 104338901 A CN104338901 A CN 104338901A
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- formwork
- mold shell
- adhesive
- investment casting
- repairing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
Abstract
The invention provides a method for repairing a precise investment casting silica sol mold shell and a mold shell wax outlet plugging material. The method comprises the following steps: preparing an adhesive, and filling a crack of the silica sol mold shell with the adhesive, wherein the adhesive is prepared from refractory cement, water and refractory sand in a mass ratio of 6:(3-4):15; the refractory cement is aluminate cement of which the content of Al2O3 is more than 75 percent; the refractory sand is emery. According to the method for repairing the precise investment casting silica sol mold shell and the mold shell wax outlet plugging material, the specific adhesive can be used for repairing the mold shell with tiny cracks and plugging a wax outlet, has the advantages of low price, simple formula, convenience in operation and easiness in start, is similar to the mold shell in ingredient, does not pollute cast alloy, and has the advantages of good normal-temperature and high-temperature adhesion, quick dryness and high flame refractory performance. Compared with a traditional method using a shell making slurry or ethyl silicate, the method has the advantages that the raw materials are cheap and are convenient to purchase, the operation is simple, the mold shell can be quickly dried without roasting, and the like.
Description
Technical field
The invention belongs to a kind of method of repairing precision-investment casting Ludox formwork, can continuing to use after repairing by having the formwork of slight crackle, reaching and saving material and time, improving the object of qualification rate.In addition, this technology can also use as shutoff wax discharging port.
Background technology
In precision-investment casting field, ceramic shell adds adhesive by multiple layer refractory and forms, and its manufacturing process is fusible pattern (wax-pattern) dip-coatings that will combine, and dries after stucco.Dip-coating repeatedly, stucco, drying, repeatedly, until meet the requirements of thickness namely form module.Again module hot water or high steam are removed fusible pattern, finally by the formwork having sufficient intensity and high-temperature stability obtained after high-temperature roasting, in order to casting.
In the preparation process of formwork, the situation that dry environment humiture deviation, handling process are careless, dewaxing temperature pressure is inappropriate etc. all may cause formwork ftracture occurs, and this will cause workpiece to be scrapped, the accident generation such as bleed-out when even casting.According to process for making shell requirement, above-mentioned situation should not occur.But crackle has still appearred in part formwork in practical work process, be difficult to avoid.If these formworks discarded, the work such as ceramic core, wax-pattern compacting, wax-pattern assembling so before have just been wasted, and shell processed itself consumes simultaneously coating, refractory material etc. have also all slatterned, and also affect follow-up casting job schedule in addition.
Therefore, those are appeared to the slight crackle at insignificant position on formwork, if can continue after being repaired to use, be so all great saving in economy and time cost.
Existing method for repairing and mending is, with shell slurry processed or silester mended crack, its Problems existing is:
(1) rate of drying is very slow, and the cycle of repairing is long;
(2) wet strength is low, needs just can play repairing effect through high-temperature roasting, increases operation;
(3) silester technique is unfavorable for environmental protection.
In addition, large for volume, to organize mould complexity formwork, often needs to open multiple wax discharging port on module, in order to avoid cause formwork to ftracture in high-temperature steam dewaxing process, but finally these wax discharging ports all need with refractory material shutoff tight, then just pourable.Wax discharging port is arranged in all directions of module, causes all wax discharging ports shutoff simultaneously not complete.Generally all need shutoff complete side wax discharging port, after its drying completes, then shutoff opposite side wax discharging port, at least divide two cycles to complete, like this, the repairing cycle becomes longer.
Summary of the invention
Object of the present invention: the present invention mainly proposes a kind of method and the formwork wax discharging port plugging material of repairing precision-investment casting Ludox formwork, to reach the object of saving economy and time cost.
Technical scheme of the present invention is:
Repair a method for precision-investment casting Ludox formwork, prepare a kind of adhesive, be filled in the crack of Ludox formwork, the constituent mass ratio of described adhesive is: refractory cement: water: fire sand=6:3 ~ 4:15.
Described refractory cement is Al
2o
3the aluminate cement that content is greater than 75%.
Described fire sand is emergy.
The step of the method is:
(1), prepare adhesive, get refractory cement by proportioning, fire sand mixes, then the furnishing pasty state that adds water, for subsequent use;
(2), by water pour into formwork and check whether to there is crackle, those being existed slight crackle can pick out dry for the formwork repaired;
(3), with water, formwork crack site is soaked;
(4), by adhesive spread upon crack surfaces, make it infiltrate in crack, dry;
(5), repair and scrape crack surfaces, remove excess adhesive, make it flush with circumferential surface;
(6), after natural drying, adhesive just can play plugging action in crack.
A kind of precision-investment casting Ludox formwork wax discharging port plugging material, its constituent mass ratio is: refractory cement: water: fire sand=6:3 ~ 4:15.
Described refractory cement is Al
2o
3the aluminate cement that content is greater than 75%.
Described fire sand is emergy.
The beneficial effect that the present invention produces is:
The present invention repairs method and the formwork wax discharging port plugging material of precision-investment casting Ludox formwork, special adhesive can not only repair the formwork having slight crackle, also can be used for shutoff wax discharging port; Formula is cheap, simple, easy and simple to handle, easy left-hand seat; Close with formwork composition, do not pollute casting alloys; Normal temperature and elevated temperature cohesiveness good, quick-drying, refractoriness is high; Compared with the way using shell slurry processed or silester with tradition, have that raw material cheaply, convenient is bought, simple to operate, formwork quick-drying, do not need the advantages such as roasting.
Detailed description of the invention
The present invention is a kind of method of repairing precision-investment casting Ludox formwork, prepares a kind of adhesive, is filled in the crack of Ludox formwork.
First prepare adhesive, get refractory cement by following proportioning, fire sand mixes, then the furnishing pasty state that adds water, for subsequent use;
Refractory cement: water: fire sand=6:3 ~ 4:15
Al selected by refractory cement
2o
3the aluminate cement that content is greater than 75%, fire sand selects emergy.
Then repair formwork, concrete step is:
(1), by water pour into formwork and check whether to there is crackle, those being existed slight crackle can pick out dry for the formwork repaired;
(2), with water, formwork crack site is soaked;
(3), by adhesive spread upon crack surfaces, make it infiltrate in crack, dry;
(4), repair and scrape crack surfaces, remove excess adhesive, make it flush with circumferential surface;
(5), after natural drying, adhesive just can play plugging action in crack.
This technology adopts aluminate class refractory cement, and it adopts technical pure alumina powder and selected lime stone to be raw material, makes after rotary kiln high-temperature calcination ripe material through fine grinding again.Be applicable to the high-grade high temperature resistant castable of preparation, be generally used for metallurgy, building materials, chemical industry, the high-temperature service refractory material of the industries such as thermoelectricity, be a kind of high-quality hydraulicity bonding agent, but be substantially not used in investment pattern precision casting Ludox formwork.This technology introduces this Al exactly
2o
3the aluminate cement (as: CA75, CA80) that content is greater than 75%, by it and water according to a certain percentage (refractory cement: water: fire sand=6:(3 ~ 4): 15) be modulated into pasty state for repairing Ludox formwork.
(1) Al is selected
2o
3the refractory cement of content high (> 75%), refractoriness is high;
(2) the pasty state shutoff material used, material and formwork body close, introduce other impurity elements little, affect foundry goods chemical composition hardly;
(3) normal temperature and elevated temperature cohesiveness good, aluminium alloy to fill after type also difficult drop-off, avoids bleed-out accident.
Advantage of the present invention:
Above-mentioned adhesive can not only repair the formwork having slight crackle, also can be used for shutoff wax discharging port; Formula is cheap, simple, easy and simple to handle, easy left-hand seat; Close with formwork composition, do not pollute casting alloys; Normal temperature and elevated temperature cohesiveness good, quick-drying, refractoriness is high; Compared with the way using shell slurry processed or silester with tradition, have that raw material cheaply, convenient is bought, simple to operate, formwork quick-drying, do not need the advantages such as roasting.
invention compliance test result example:
Embodiment one: the repairing of certain tubular member precision-investment casting formwork and the shutoff of wax discharging port
Formwork: Ludox+alumina refractory, the number of plies 8 layers.
1. first batch of formwork: except cup, module does not offer other wax discharging port, after dewaxing, the outer surface formwork cracking of most of module, after the repair with adhesives with this formula, be successfully completed casting, foundry goods is qualified.
2. two batches of formworks: set up wax discharging port on module, after dewaxing, formwork seldom has cracking, assist wax discharging port with the adhesion agent for blocking of this formula, be successfully completed casting, foundry goods is qualified.
Embodiment two: the shutoff of the wax discharging port of certain " work " font part precision-investment casting formwork
Formwork: Ludox+alumina refractory, the number of plies 7 layers.
The feature of this part is that the structure of each dimension is all more complicated, and formwork dewaxing passage is very not smooth, and all directions all need to set up wax discharging port.After dewaxing, formwork is without cracking, and with the whole wax discharging port of the disposable shutoff of adhesive of this formula, be successfully completed casting, foundry goods is qualified.
Its large-scale application is being repaired in slight crackle and the operation of shutoff wax discharging port by I company.
Claims (7)
1. repair a method for precision-investment casting Ludox formwork, it is characterized in that, prepare a kind of adhesive, be filled in the crack of Ludox formwork, the constituent mass ratio of described adhesive is: refractory cement: water: fire sand=6:3 ~ 4:15.
2. method of repairing precision-investment casting Ludox formwork as claimed in claim 1, it is characterized in that, described refractory cement is Al
2o
3the aluminate cement that content is greater than 75%.
3. method of repairing precision-investment casting Ludox formwork as claimed in claim 1, it is characterized in that, described fire sand is emergy.
4. the method for the repairing precision-investment casting Ludox formwork as described in as arbitrary in claims 1 to 3, it is characterized in that, the step of the method is:
(1), prepare adhesive, get refractory cement by proportioning, fire sand mixes, then the furnishing pasty state that adds water, for subsequent use;
(2), by water pour into formwork and check whether to there is crackle, those being existed slight crackle can pick out dry for the formwork repaired;
(3), with water, formwork crack site is soaked;
(4), by adhesive spread upon crack surfaces, make it infiltrate in crack, dry;
(5), repair and scrape crack surfaces, remove excess adhesive, make it flush with circumferential surface;
(6), after natural drying, adhesive just can play plugging action in crack.
5. a precision-investment casting Ludox formwork wax discharging port plugging material, is characterized in that, its constituent mass ratio is: refractory cement: water: fire sand=6:3 ~ 4:15.
6. precision-investment casting Ludox formwork wax discharging port plugging material as claimed in claim 5, it is characterized in that, described refractory cement is Al
2o
3the aluminate cement that content is greater than 75%.
7. precision-investment casting Ludox formwork wax discharging port plugging material as claimed in claim 5, it is characterized in that, described fire sand is emergy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565438.4A CN104338901B (en) | 2014-10-22 | 2014-10-22 | Repair method and the formwork wax discharging port plugging material of precision-investment casting Ludox formwork |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565438.4A CN104338901B (en) | 2014-10-22 | 2014-10-22 | Repair method and the formwork wax discharging port plugging material of precision-investment casting Ludox formwork |
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| CN104338901A true CN104338901A (en) | 2015-02-11 |
| CN104338901B CN104338901B (en) | 2016-09-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734913A (en) * | 2016-12-28 | 2017-05-31 | 西安西工大超晶科技发展有限责任公司 | A kind of precision-investment casting model method for repairing and mending |
| CN107716864A (en) * | 2017-09-18 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of method for repairing and mending of silica sol ceramic mold shell shake line |
| CN109128036A (en) * | 2017-06-28 | 2019-01-04 | 通用电气公司 | The casting core-shell hybrid mold and ceramic shell of increasing material manufacturing |
| CN109175288A (en) * | 2018-09-20 | 2019-01-11 | 贵州安吉航空精密铸造有限责任公司 | A kind of fusible pattern centrifugal casting formwork dewaxing mouth plugging device and its application method |
| CN109332590A (en) * | 2018-11-28 | 2019-02-15 | 贵州安吉航空精密铸造有限责任公司 | It is a kind of that the closed method of wax discharging port is carried out using casting formwork |
| CN110918898A (en) * | 2019-11-11 | 2020-03-27 | 中国航发沈阳黎明航空发动机有限责任公司 | Large ceramic shell crack repairing method |
| CN112743048A (en) * | 2020-12-29 | 2021-05-04 | 航天海鹰(哈尔滨)钛业有限公司 | Shell mould repairing method for high-temperature alloy precision investment casting |
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| CN1109806A (en) * | 1995-03-15 | 1995-10-11 | 张庆友 | Moulding sand adhesive for casting |
| CN1159372A (en) * | 1996-12-16 | 1997-09-17 | 华南理工大学 | Bell socket sand core for centrifugal casting iron drain-pipe and production method thereof |
| CN103167918A (en) * | 2011-10-14 | 2013-06-19 | 有限会社小松铸型制作所 | Shaping material, functional agent, shaped product, and product |
| CN103551505A (en) * | 2013-10-31 | 2014-02-05 | 贵州安吉航空精密铸造有限责任公司 | Method for detecting and improving quality of precision casting mold |
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2014
- 2014-10-22 CN CN201410565438.4A patent/CN104338901B/en active Active
Patent Citations (4)
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| CN1109806A (en) * | 1995-03-15 | 1995-10-11 | 张庆友 | Moulding sand adhesive for casting |
| CN1159372A (en) * | 1996-12-16 | 1997-09-17 | 华南理工大学 | Bell socket sand core for centrifugal casting iron drain-pipe and production method thereof |
| CN103167918A (en) * | 2011-10-14 | 2013-06-19 | 有限会社小松铸型制作所 | Shaping material, functional agent, shaped product, and product |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734913A (en) * | 2016-12-28 | 2017-05-31 | 西安西工大超晶科技发展有限责任公司 | A kind of precision-investment casting model method for repairing and mending |
| CN106734913B (en) * | 2016-12-28 | 2018-09-28 | 西安西工大超晶科技发展有限责任公司 | A kind of precision-investment casting model method for repairing and mending |
| CN109128036A (en) * | 2017-06-28 | 2019-01-04 | 通用电气公司 | The casting core-shell hybrid mold and ceramic shell of increasing material manufacturing |
| US11235378B2 (en) | 2017-06-28 | 2022-02-01 | General Electric Company | Additively manufactured casting core-shell hybrid mold and ceramic shell |
| CN107716864A (en) * | 2017-09-18 | 2018-02-23 | 东方电气集团东方汽轮机有限公司 | A kind of method for repairing and mending of silica sol ceramic mold shell shake line |
| CN109175288A (en) * | 2018-09-20 | 2019-01-11 | 贵州安吉航空精密铸造有限责任公司 | A kind of fusible pattern centrifugal casting formwork dewaxing mouth plugging device and its application method |
| CN109332590A (en) * | 2018-11-28 | 2019-02-15 | 贵州安吉航空精密铸造有限责任公司 | It is a kind of that the closed method of wax discharging port is carried out using casting formwork |
| CN110918898A (en) * | 2019-11-11 | 2020-03-27 | 中国航发沈阳黎明航空发动机有限责任公司 | Large ceramic shell crack repairing method |
| CN112743048A (en) * | 2020-12-29 | 2021-05-04 | 航天海鹰(哈尔滨)钛业有限公司 | Shell mould repairing method for high-temperature alloy precision investment casting |
| CN112743048B (en) * | 2020-12-29 | 2023-08-15 | 航天海鹰(哈尔滨)钛业有限公司 | Shell type repairing method for high-temperature alloy investment precision casting |
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| CN104338901B (en) | 2016-09-14 |
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