CN104043777A - Investment casting method - Google Patents
Investment casting method Download PDFInfo
- Publication number
- CN104043777A CN104043777A CN201410304047.7A CN201410304047A CN104043777A CN 104043777 A CN104043777 A CN 104043777A CN 201410304047 A CN201410304047 A CN 201410304047A CN 104043777 A CN104043777 A CN 104043777A
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- Prior art keywords
- slurry
- shell
- casting method
- investment casting
- layers
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- 238000005495 investment casting Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000007667 floating Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 229910052863 mullite Inorganic materials 0.000 abstract 1
- 239000000741 silica gel Substances 0.000 abstract 1
- 229910002027 silica gel Inorganic materials 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses an investment casting method, and belongs to the field of casting. The investment casting method is characterized by comprising the following steps: immersing precision castings having long holes and narrow grooves and being manufactured with 2 or 3 layers of shells into slurry, enabling rest spaces of the shells in the long holes or narrow grooves to be filled with the slurry, and then manufacturing a next layer of shell after the slurry in the spaces is completely dry, wherein the slurry for immersing is silica gel and mullite powder (200 meshes) and has the viscosity of 20+/-2S; floating sand in the long holes is blown off before immersing into the slurry, the shells are completely dry after being immersed into the slurry so as to guarantee the intensity, the three layers of a connector is dried for 24 hours after being immersed into the slurry, the drying is carried out by blowing air at the temperature of 24+/-2 DEG C and the humidity of 40%-60%. The problems that in the prior art, long-hole and narrow-groove investment castings have long holes and narrow grooves, so that coating and sand scattering are difficult, during pouring, runout easily occurs in the holes and grooves, and defect of porosity shrinkage exits are solved.
Description
Technical field
The invention belongs to casting field, relate in particular to a kind of investment casting method.
Background technology
Model casting claims again " lost-wax casting ", normally coat several layers of refractory material on wax-pattern surface, after its dry through, molten the going of wax-pattern wherein made to shell, pass through again roasting, then pour into a mould, and a kind of method of acquisition foundry goods, because the foundry goods obtaining has higher dimensional accuracy and surface smoothness, therefore claim again " precision-investment casting "; The advantage of model casting maximum is exactly because investment-casting has very high dimensional accuracy and surface smoothness, so can reduce machining work, a little allowance is stayed at the position of just having relatively high expectations on part, even some foundry goods only stays polishing, polishing surplus, needn't machining can use; As can be seen here, adopt investment casting method can save in a large number machine tool and machining period, significantly save raw material metal.
Investment casting shell is the repetition of coat-stucco-dry this process.But for thering is the foundry goods of the narrow groove structure of slotted hole because slotted hole, narrow groove inside are difficult for coating, stucco, easily runout in hole, groove when cast, when the hole depth of through hole and aperture than H/d > 5, narrow groove and deep hole are just difficult to cast out, and often adopt the method for machining to realize; For the slotted hole of slightly larger in diameter, although shell can be made, filled up by slurry, molding sand, increase the possibility that shrinkage cavity and porosity defect occurs.
Summary of the invention
The object of this invention is to provide a kind of investment casting method, solved slotted hole in prior art, narrow groove class investment-casting is difficult for coating and stucco because hole elongated slot is narrow, the problem of easily running away in hole, groove when cast and having shrinkage defect to occur.
In order to achieve the above object, the present invention by the following technical solutions: a kind of investment casting method, comprises the following steps.
1, the precision castings that there is slotted hole, narrow groove in shell being immersed in to slurry after 2 layers or 3 layers, shell processed, make slurry be full of slotted hole or narrow groove in the space of shell remainder after slurry wherein parches, carry out again the making of next stratotype shell.
2, soaking paste slurry: Ludox+do not come powder (200 order), viscosity: 20 ± 2S.
3, before soaking paste, blow off the floating sand in slotted hole.
4, after soaking paste, shell must parch with proof strength, and connecing drying time after layer 3 header soaking paste is 24 hours, drying condition: temperature is 24 ± 2 DEG C, and humidity is 40% ~ 60%, blowing.
The invention has the beneficial effects as follows: solved slotted hole in prior art, narrow groove class investment-casting is difficult for coating and stucco because hole elongated slot is narrow, easily runout in hole, groove when cast, and the problem that has shrinkage defect to occur; The method is simple, is convenient to promote.
Brief description of the drawings
Fig. 1 is the cross-sectional view of joint A.
Detailed description of the invention
Further describe the present invention below in conjunction with accompanying drawing by specific embodiment, but invention is not only confined to following examples.
As shown in Figure 1, be a kind of precision castings joint A with slotted hole, narrow groove, on it, there is a Φ 4mm × 25 mm elongated orifices, be 135 ° and intersect, thick 1 mm of hole wall, head 0.7 mm, quality is 9.5g; In the time that aperture is 35 mm maximum castable go out hole depth be 5 ~ 10 mm, this part hole depth is 6.25 with the ratio in aperture, visible Φ 4 mm hole d shells processed are difficult points of this part; This part the 1st, 2 stratotype shells all adopt zircon sand, the thick about 0.5mm of the 1st stratotype shell, the thick about 0.75mm of the 2nd stratotype shell, after shell processed is two-layer, the Φ 4mm 1.5mm that only has an appointment in aperture, when the 3rd layer of normal shell processed, spread 30 ~ 60 orders and do not carry out sand, particle diameter is 0.2 ~ 0.6mm, and slotted hole is 135 ° and intersects, the stucco of normally coating in hole cannot realize, but two-layer zircon sand investment shell intensity is less, can produce runout phenomenon and cause waste product; After 2 layers, adopt soaking paste, be immersed in slurry by shell, make slurry be full of the space of shell remainder in slotted hole or narrow groove, after slurry wherein parches, then carry out the making of next stratotype shell, the intensity that increases shell in slotted hole, narrow groove prevent from the running away generation of phenomenon.
Soaking paste slurry is Ludox+do not carry out powder (200 order), and viscosity is 20 ± 2S, if it is bad to flow when the large soaking paste of viscosity, is difficult for being full of; Viscosity is little, seems full when soaking paste, but after parching because moisture evaporation can leave more cavity, affect intensity; Before soaking paste, blow off the floating sand in slotted hole, after soaking paste, shell must parch, and with proof strength, as shown in Figure 1, after the soaking paste of joint A3 layer, be 24 hours drying time, drying condition: temperature is 24 ± 2 DEG C, and humidity is 40% ~ 60%, blowing.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention; The present invention does not describe part in detail, is those skilled in the art of the present technique's known technology.
Claims (4)
1. an investment casting method, is characterized in that: in shell being immersed in to slurry for the precision castings with slotted hole, narrow groove after 2 layers or 3 layers, shell processed, make slurry be full of slotted hole or narrow groove in the space of shell remainder after slurry wherein parches, carry out again the making of next stratotype shell.
2. a kind of investment casting method according to claim 1, is characterized in that: soaking paste slurry is Ludox+do not come powder (200 order), viscosity: 20 ± 2S.
3. a kind of investment casting method according to claim 1, is characterized in that: before soaking paste, blow off the floating sand in slotted hole.
4. a kind of investment casting method according to claim 1, is characterized in that: after soaking paste, shell must parch with proof strength, and connecing drying time after layer 3 header soaking paste is 24 hours, drying condition: temperature is 24 ± 2 DEG C, and humidity is 40% ~ 60%, blowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410304047.7A CN104043777A (en) | 2014-06-30 | 2014-06-30 | Investment casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410304047.7A CN104043777A (en) | 2014-06-30 | 2014-06-30 | Investment casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104043777A true CN104043777A (en) | 2014-09-17 |
Family
ID=51497445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410304047.7A Pending CN104043777A (en) | 2014-06-30 | 2014-06-30 | Investment casting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104043777A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104439067A (en) * | 2014-10-09 | 2015-03-25 | 湖南先淘不锈钢卫浴有限公司 | Shell making process for deep-hole part with core-shell integration |
| CN105537517A (en) * | 2015-12-18 | 2016-05-04 | 贵州安吉航空精密铸造有限责任公司 | Manufacturing process for mould shell for investment casting of belt turning deep hole |
| CN105583364A (en) * | 2015-12-17 | 2016-05-18 | 贵州安吉航空精密铸造有限责任公司 | Casting technology for forming small-size complex cavity of titanium alloy casting |
| CN109202019A (en) * | 2018-11-16 | 2019-01-15 | 襄阳五二五泵业有限公司 | A kind of moulding process casting double shrouded wheel |
| CN112045151A (en) * | 2020-09-23 | 2020-12-08 | 贵州安吉航空精密铸造有限责任公司 | A casting mold shell drying device |
| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
| CN116809861A (en) * | 2023-06-30 | 2023-09-29 | 贵州安吉航空精密铸造有限责任公司 | Filling and coating method for casting narrow groove deep hole in investment casting |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266905A (en) * | 2011-07-08 | 2011-12-07 | 山东泰山钢铁集团有限公司 | Manufacturing process of part shell with location hole |
| CN102935488A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler |
-
2014
- 2014-06-30 CN CN201410304047.7A patent/CN104043777A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266905A (en) * | 2011-07-08 | 2011-12-07 | 山东泰山钢铁集团有限公司 | Manufacturing process of part shell with location hole |
| CN102935488A (en) * | 2012-11-19 | 2013-02-20 | 重庆精芯通铸造材料有限公司 | Shell filler assisting shell manufacture in investment casting and method filling shells by adopting filler |
Non-Patent Citations (1)
| Title |
|---|
| 包玉秋等: "《长孔、窄槽类铸件的熔模铸造工艺》", 《特种铸造及有色合金》, vol. 33, no. 7, 31 July 2013 (2013-07-31) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104439067A (en) * | 2014-10-09 | 2015-03-25 | 湖南先淘不锈钢卫浴有限公司 | Shell making process for deep-hole part with core-shell integration |
| CN104439067B (en) * | 2014-10-09 | 2017-08-29 | 湖南先淘不锈钢卫浴有限公司 | Core shell unifies deep hole part process for making shell |
| CN105583364A (en) * | 2015-12-17 | 2016-05-18 | 贵州安吉航空精密铸造有限责任公司 | Casting technology for forming small-size complex cavity of titanium alloy casting |
| CN105537517A (en) * | 2015-12-18 | 2016-05-04 | 贵州安吉航空精密铸造有限责任公司 | Manufacturing process for mould shell for investment casting of belt turning deep hole |
| CN109202019A (en) * | 2018-11-16 | 2019-01-15 | 襄阳五二五泵业有限公司 | A kind of moulding process casting double shrouded wheel |
| CN112045151A (en) * | 2020-09-23 | 2020-12-08 | 贵州安吉航空精密铸造有限责任公司 | A casting mold shell drying device |
| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
| CN116809861A (en) * | 2023-06-30 | 2023-09-29 | 贵州安吉航空精密铸造有限责任公司 | Filling and coating method for casting narrow groove deep hole in investment casting |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20140917 |