CN104399889B - A kind of hulling method after the conjuncted blade model casting of aero-engine - Google Patents
A kind of hulling method after the conjuncted blade model casting of aero-engine Download PDFInfo
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- CN104399889B CN104399889B CN201410623942.5A CN201410623942A CN104399889B CN 104399889 B CN104399889 B CN 104399889B CN 201410623942 A CN201410623942 A CN 201410623942A CN 104399889 B CN104399889 B CN 104399889B
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- foundry goods
- shell
- dehydrogenation
- blade
- neutralization
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/04—Handling or stripping castings or ingots
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Hulling method after the conjuncted blade model casting of a kind of aero-engine, first removes cast(ing) surface major part shell with the water of 30Mpa～40Mpa；Then foundry goods is soaked 2～5 hours with the hydrofluoric acid solution containing HF 35%～50%；Soaking with neutralization solution, it is neutral for making cast(ing) surface again；Dehydrogenation in dehydrogenation stove is put into after 80 DEG C～100 DEG C hot water injections；Finally adopt the dry blast of facing sand, complete shelling overall process。This hulling method can be prevented effectively from the blade surface damage that emergy blast causes, it is ensured that blade surface roughness reaches 1.6 microns of requirements；Monocrystalline, directional vane will not be produced recrystallization hidden danger。
Description
Technical field
The present invention relates to model casting, particularly the hulling method after the conjuncted blade model casting of a kind of aero-engine。
Background technology
Along with the development of blade of aviation engine manufacturing technology, blade styles gets more and more, and blade surface roughness requirements is more and more higher, and the shelling after blade hot investment casting is directly connected to the surface roughness of blade。
Traditional blade shelling adopts pneumatic pick vibration, then shells by the method for emergy blast。In this method, blade surface can be formed damage by emergy blast, makes blade surface roughness not reach requirement, especially conjuncted blade, repairs difficulty very big after surface damage。For monocrystalline, directional vane, emergy blast also can form stress, produces recrystallization after causing heat treatment。
Summary of the invention
It is an object of the invention to provide the hulling method after the conjuncted blade model casting of a kind of aero-engine, solve the damaged blade surface of tradition hulling method existence and the recrystallization technology problem of monocrystalline, directional vane。
For realizing this purpose, the hulling method after the conjuncted blade model casting of aero-engine provided by the invention sequentially includes the following steps:
Step one: first foundry goods group is put into waterpower hulling machine, shell with the water of 30Mpa～40Mpa hydraulic pressure, during operation, control the distance of muzzle and shell between 30～40cm, water column becomes 20～30 degree of angles with shell surface, makes water column that shell surface is carried out reciprocating impact, notes not by foundry goods blastic deformation, until major part shell impacts from foundry goods, shell difficult drop-off place is without till complete shell；
Step 2: foundry goods is cut down foundry goods group with cutting machine, the foundry goods cut down is respectively put in the hydrofluoric acid solution that HF content is 35%～50% and soaks 2～5 hours, in immersion process, at interval of within 1～2 hour, teetertottering foundry goods 3～5 times, with the chemical reaction that accelerates Fluohydric acid. and aluminium oxide in shell and aktivton, (chemical equation is for SiO2+ 6HF=H2SiF6+2H2O, Al2O3+ 6HF=2AlF3+3H2O)；After completing immersion, foundry goods is taken out；
Step 3: the foundry goods after immersion is put into and soaks no less than 1 hour in neutralization solution, ammonia or the sodium carbonate liquor that neutralization solution adopts concentration to be 1%～5%；Take out foundry goods after neutralization, check that cast(ing) surface should be neutral (pH=6～8) with reagent paper；
Step 4: utilize 80 DEG C～100 DEG C hot water to be rinsed well by the foundry goods after neutralization；
Step 5: the foundry goods after rinsing is put into dehydrogenation in dehydrogenation stove, dehydrogenation temperature 180 DEG C～250 DEG C, takes out after being incubated 1～2 hour；
Step 6: with the facing sand of granularity 120# or 180# or thinner, foundry goods after dehydrogenation is carried out dry blast, cleaned out by cast(ing) surface, so far completes the shelling after blade model casting。
The advantage of hulling method of the present invention is, can be prevented effectively from the blade surface damage that emergy blast causes, it is ensured that the surface roughness of blade can reach the requirement of 1.6 microns；Monocrystalline, directional vane will not be produced recrystallization hidden danger。
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described
The present embodiment is for shell to certain type Blade roughcast。This blade is concatemer blade, and foundry goods blade is about 200mm, and string width is about 200mm, aerofluxus limit thickness 0.4mm, leading edge thickness 0.5mm, and blade interior thickness is about 2mm, belongs to wide string type blade, and the surface roughness requirements of blade reaches Ra1.6 micron。
Adopting the inventive method to shell, its operating procedure is:
Step one: first Blade roughcast group is put into waterpower hulling machine, the water adopting 38Mpa hydraulic pressure shells, during operation, control the distance 40cm of muzzle and shell, water column becomes 30 degree of angles with shell surface, makes water column that shell surface is carried out reciprocating impact, notes not by foundry goods blastic deformation, until major part shell impacts from foundry goods, shell difficult drop-off place is without till complete shell；
Step 2: cut down foundry goods group by foundry goods with cutting machine, is respectively put into the foundry goods cut down in the hydrofluoric acid solution that HF content is 40% and soaks 2 hours, in immersion process, at interval of within 1 hour, teetertottering foundry goods 5 times；After completing immersion, foundry goods is taken out；
Step 3: the foundry goods after soaking is put into immersion 0.5 hour in neutralization solution, and neutralization solution adopts concentration to be the sodium carbonate liquor of 5%；Take out foundry goods after neutralization, check that cast(ing) surface should be neutral (pH=6～8) with reagent paper；
Step 4: utilize 100 DEG C of hot water to be rinsed well by the foundry goods after neutralization；
Step 5: the foundry goods rinsed well is put into dehydrogenation in dehydrogenation stove, dehydrogenation temperature 200 DEG C, takes out after being incubated 1 hour；
Step 6: with the facing sand of granularity 180#, the foundry goods after dehydrogenation is carried out dry blast, cleaned out by cast(ing) surface, so far completes the de-hulling process after blade model casting。
Blade after shelling, after testing, its surface nondestructive is hindered, and roughness reaches Ra1.6 micron requirement。
Claims (1)
1. the hulling method after the conjuncted blade model casting of aero-engine, it is characterised in that sequentially include the following steps:
Step one: first foundry goods group is put into waterpower hulling machine, shell with the water of 30Mpa～40Mpa hydraulic pressure, during operation, control the distance of muzzle and shell between 30～40cm, water column becomes 20～30 degree of angles with shell surface, makes water column that shell surface is carried out reciprocating impact, notes not by foundry goods blastic deformation, until major part shell impacts from foundry goods, shell difficult drop-off place is without till complete shell；
Step 2: foundry goods is cut down foundry goods group with cutting machine, the foundry goods cut down is respectively put in the hydrofluoric acid solution that HF content is 35%～50% and soaks 2～5 hours, in immersion process, at interval of within 1～2 hour, teetertottering foundry goods 3～5 times, to accelerate the chemical reaction of Fluohydric acid. and aluminium oxide in shell with aktivton；After completing immersion, foundry goods is taken out；
Step 3: the foundry goods after immersion is put into and soaks no less than 1 hour in neutralization solution, ammonia or the sodium carbonate liquor that neutralization solution adopts concentration to be 1%～5%；Take out foundry goods after neutralization, check that cast(ing) surface should be neutrality with reagent paper；
Step 4: utilize 80 DEG C～100 DEG C hot water to be rinsed well by the foundry goods after neutralization；
Step 5: the foundry goods after rinsing is put into dehydrogenation in dehydrogenation stove, dehydrogenation temperature 180 DEG C～250 DEG C, takes out after being incubated 1～2 hour；
Step 6: with the facing sand of granularity 120# or 180# or thinner, foundry goods after dehydrogenation is carried out dry blast, cleaned out by cast(ing) surface, so far completes the shelling after blade model casting。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410623942.5A CN104399889B (en) | 2014-11-07 | 2014-11-07 | A kind of hulling method after the conjuncted blade model casting of aero-engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410623942.5A CN104399889B (en) | 2014-11-07 | 2014-11-07 | A kind of hulling method after the conjuncted blade model casting of aero-engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104399889A CN104399889A (en) | 2015-03-11 |
| CN104399889B true CN104399889B (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410623942.5A Active CN104399889B (en) | 2014-11-07 | 2014-11-07 | A kind of hulling method after the conjuncted blade model casting of aero-engine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812883B (en) * | 2017-10-25 | 2019-07-19 | 东方电气集团东方汽轮机有限公司 | A kind of ceramic shell preparation method for eliminating conjuncted blade blade thermal center |
| CN108543911A (en) * | 2018-05-24 | 2018-09-18 | 东营嘉扬精密金属有限公司 | Pure white sand improves investment casting formwork collapsibility technique |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561491A (en) * | 1983-12-07 | 1985-12-31 | Rolls-Royce Limited | Investment casting |
| GB2202772A (en) * | 1987-03-25 | 1988-10-05 | Ae Plc | Improvements in or relating to supporting cores during investment casting |
| KR20050021332A (en) * | 2003-08-28 | 2005-03-07 | 유나이티드 테크놀로지스 코포레이션 | Investment casting |
| CN101549385A (en) * | 2008-03-31 | 2009-10-07 | 沈阳工业大学 | Process method for preparing high-temperature alloy miniature precision casting part |
| CN103170581A (en) * | 2011-12-22 | 2013-06-26 | 杭州恒力泵业制造有限公司 | Corrosion-resistant impeller casting process |
-
2014
- 2014-11-07 CN CN201410623942.5A patent/CN104399889B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561491A (en) * | 1983-12-07 | 1985-12-31 | Rolls-Royce Limited | Investment casting |
| GB2202772A (en) * | 1987-03-25 | 1988-10-05 | Ae Plc | Improvements in or relating to supporting cores during investment casting |
| KR20050021332A (en) * | 2003-08-28 | 2005-03-07 | 유나이티드 테크놀로지스 코포레이션 | Investment casting |
| CN101549385A (en) * | 2008-03-31 | 2009-10-07 | 沈阳工业大学 | Process method for preparing high-temperature alloy miniature precision casting part |
| CN103170581A (en) * | 2011-12-22 | 2013-06-26 | 杭州恒力泵业制造有限公司 | Corrosion-resistant impeller casting process |
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| CN104399889A (en) | 2015-03-11 |
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Address after: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee after: Chinese Hangfa Shenyang Liming Aero engine limited liability company Address before: 110043 Dong TA street, Dadong District, Shenyang, Liaoning Province, No. 6 Patentee before: Liming Aeroplane Engine (Group) Co., Ltd., Shenyang City |
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| CP01 | Change in the name or title of a patent holder |