CN103658536A - Fired mold low-pressure casting process of integral type compressor impeller - Google Patents
Fired mold low-pressure casting process of integral type compressor impeller Download PDFInfo
- Publication number
- CN103658536A CN103658536A CN201410003559.XA CN201410003559A CN103658536A CN 103658536 A CN103658536 A CN 103658536A CN 201410003559 A CN201410003559 A CN 201410003559A CN 103658536 A CN103658536 A CN 103658536A
- Authority
- CN
- China
- Prior art keywords
- shell
- low
- coating
- pressure
- temperature
- 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.)
- Pending
Links
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The invention provides a fired mold low-pressure casting process of an integral type compressor impeller. The process comprises the following steps of preparing coating with silica sol binder for fired mold casting, wherein a fireproofing surface layer and a second layer are made of fused alumina powder and sand, and a reinforced layer is made of mullite powder and sand special for fired mold casting; when coating the coating on the reinforced layer, adopting a two-time slurry staining method, i.e. firstly staining thin coating and secondly staining thick coating; and after dewaxing a shell, roasting at the low temperature of 500 DEG C, storing, and roasting at high temperature before pouring, wherein the temperature of high-temperature roasting is 1000 DEG C, the heat preservation time is 4h, and the temperature of the shell during pouring is 100-150 DEG C. The prepared shell is high in strength, low-pressure pouring can be carried out by utilizing a single shell, the pouring temperature of molten aluminum is 670-680 DEG C, the mold-filling pressure is 0.03 MPa, the mold-filling time is 10s, the solidification holding pressure is 0.35 MPa, and the holding pressure time is 5min. The integral type compressor impeller produced by adopting the fired mold low-pressure casting process is good in mold-filling and feeding effect, compact in casting tissue, good in product mechanical property and inner quality, high in production efficiency, and low in labor intensity, and has no need to be modeled through binning.
Description
Technical field
The present invention relates to a kind of casting technique of Al-alloy parts, relate in particular to a kind of casting technique of aluminum alloy impeller.
Background technology
Model casting production technology comprises compacting, module welding, coating, hanging sand, dewaxing, the Baking of easy fusible pattern, cast.With respect to other casting method, investment-casting dimensional accuracy and surface roughness are high, are usually used in dimensional accuracy and surface roughness and require high, and the part of difficult processing, particularly complex structure, utilizes other casting method to be not easy the foundry goods of moulding, and conventional investment casting method is produced.
Integrated Compressor Impeller in certain large-sized diesel motor turbocharger, working speed 32500r/min (rpm), wheel diameter Φ 210mm, the number of blade 19, blade is crooked Varying-thickness, and thinnest part 0.5mm requires to have enough intensity and certain plasticity, particularly the rank requirement of the inner macrostructure of wheel hub is high, to guarantee its service behaviour and security.
Integrated Compressor Impeller material is Casting Al-Si magnesium alloy ZL104, background production technology is: model casting is produced, and the easy fusible pattern of warm mould material, silicasol case in employing, be put into the shell making in the iron case of bed load, fill out dry moulding, then carry out roasting, cast; Pouring type is centrifugal casting, utilizes centrifugal force to improve the mold-filling capacity at blade thin-walled place.Requirement, to one of the impeller sampling observation of every cast batch, except carrying out chemical composition detection, also will, to carrying out macrostructure's detection after the subdivision of impeller hub position, mainly detect pin hole and loose rank.In production, if cause foundry goods to be scrapped because macrostructure is defective, be to scrap in batches, cause casting wasted product rate high, and the low work quality that affects impeller of foundry goods macrostructure rank be prone to fault.
Low pressure casting be a kind of molten metal that makes from bottom to top in certain pressure lower charging type and the casting technique of solidifying, molten metal to fill type effective, it is abundant that under certain pressure, solidification and crystallization can make molten metal feeding, foundry goods dense structure.Low pressure casting is generally metal mold with casting mold, also has sand mold, gypsum mould, ceramic mould, investment casting shell etc.Investment casting shell, at low press upper, is generally taked the moulding of casing, but due to cast gate super under, need special-purpose closed sandbox, production efficiency is very low, casting mold exhaust conditions is also bad.
Adopt monoshell to carry out low-pressure casting, need shell to there is enough intensity, guarantee that in filling and solidification processess, shell does not ftracture; On the other hand, in low pressure mold filling and solidification processes, casting mold inner chamber seals, and shell should have good venting quality.Integrated Compressor Impeller casting section thickness difference is large, and dense structure's degree requires high, and general low-pressure casting technique is difficult to meet the demands.
Thereby the fusible pattern low-pressure casting process of a kind of Integrated Compressor Impeller of needs, makes the fine type that fills of blade part potential energy on the one hand; Make on the other hand in casting solidification process feeding abundant, exhaust is good, dense structure.This is aim of the present invention.
Summary of the invention
The object of the invention is to provide a kind of fusible pattern low-pressure casting process of Integrated Compressor Impeller, improves impeller dense internal organization degree, Improving The Quality of Products, and production efficiency is high simultaneously, and labour intensity is low.
The fusible pattern low-pressure casting process of a kind of Integrated Compressor Impeller provided by the invention, comprises shell processed, Baking, low pressure mold filling and solidification step,
Shell processed: comprise preparation coating and hanging sand, adopt Colloidal Silica Sol Binder in Investment Casting preparation coating, refractory material surface layer and two layers be electro-corundum powder, sand, and back-up coat is model casting special use mullite powder, sand; Preparation coating is used grating powder, investment precoat viscosity 40～45s, density 2.1～2.2g/cm with refractory powder
3, be coated with 80# electro-corundum sand; Two coating viscosity 30～35s, density 2.0～2.1g/cm
3, be coated with 60# electro-corundum sand; Two kinds of coating for back-up coat, a kind of dope viscosity 10～13s, density 1.81～1.83g/cm
3, another kind of dope viscosity 25～30s, density 1.85～1.95g/cm
3, while being coated with reinforced layered slurry, adopt the method for twice stickness paint, to be first stained with rare coating, then to be stained with thick coating, hanging sand granularity is followed successively by 30-50#, 20-40#, 20-40#, 12-20#, is finally coated with the coating of one deck dope viscosity 25～30s; The shell that painting hangs up properly adopts autoclave to take off easy fusible pattern after placing 4h;
Shell low-temperature bake: shell shove charge is warming up to 500 ℃ of insulation 2h, is cooled to and is less than 200 ℃ of air cooling to room temperatures of coming out of the stove and deposits, in 5 weeks resting periods with stove;
Shell high-temperature roasting: the shell of low-temperature bake carries out high-temperature roasting before cast, 1000 ℃ of shell high-temperature roasting temperature, insulation 4h, comes out of the stove after being less than 500 ℃ with stove air cooling, and shell temperature during cast is 100～150 ℃;
Shell location clamps: low press stalk placement screen pack suitable for reading, lay chassis special, and then shell is watered to mouth down and put into above center chassis screen pack, around with alumina silicate fibre insulation material, to seal, top compresses shell;
Low pressure mold filling and solidification: 670～680 ℃ of aluminium liquid pouring temperatures, mold filling pressure 0.03MPa, time 10s, solidify dwell pressure 0.35MPa, dwell time 5min.The Integrated Compressor Impeller wheel hub position feeding that utilizes the present invention to pour into a mould is abundant, dense structure, free of pinholes and rarefaction defect.
The invention has the beneficial effects as follows:
(1) schmigel for surface layer, being coated with property of sand are good, obtain high surface roughness; Mullite powder, sand for back-up coat, shell good permeability; Colliery powder, sand, twice stickness paint of employing for back-up coat, hanging sand granularity successively increases, and makes investment shell intensity high, and monoshell is through double roasting, do not ftracture, exhaust is abundant in low pressure mold filling and solidification processes.
(2) adopt lower pouring temperature, suitable mold filling pressure and filling time, higher dwell pressure and dwell time, fill type and feeding is effective, foundry goods dense structure, can effectively improve mechanical property and the inherent quality of product, and the moulding of need not casing, production efficiency is high, and labour intensity is low.
The specific embodiment
Specific embodiment one
Shell processed: silica sol binder SiO
2content 20%, refractory material surface layer and two layers are electro-corundum powder, sand, back-up coat is the special-purpose mullite powder of model casting, sand; Investment precoat viscosity 40s, density 2.1g/cm
3, be coated with 80# electro-corundum sand, two coating viscosity 30s, density 2.0g/cm
3, be coated with 60# electro-corundum sand, two kinds of coating for back-up coat, a kind of dope viscosity 10s, density 1.81g/cm
3, another kind of dope viscosity 25s, density 1.86g/cm
3, while being coated with reinforced layered slurry, to be first stained with rare coating, then to be stained with thick coating, hanging sand granularity is followed successively by 30-50#, 20-40#, 20-40#, 12-20#, is finally coated with the coating of one deck dope viscosity 25s; The shell that painting hangs up properly adopts autoclave to take off easy fusible pattern after placing 4h;
Shell low-temperature bake: shell shove charge is warming up to 500 ℃ of insulation 2h, is cooled to 200 ℃ of air cooling to room temperatures of coming out of the stove and deposits, 1 day resting period with stove;
Shell high-temperature roasting: the shell of low-temperature bake carries out high-temperature roasting before cast, 1000 ℃ of shell high-temperature roasting temperature, insulation 4h, cooling with coming out of the stove after stove air cooling to 500 ℃;
Shell location clamps: low press stalk placement screen pack suitable for reading, lay chassis special, and then shell is watered to mouth down and put into above center chassis screen pack, around with alumina silicate fibre insulation material, to seal, top compresses shell;
Low pressure mold filling and solidification: while filling type cast, shell temperature is 150 ℃, 670 ℃ of aluminium liquid pouring temperatures, mold filling pressure 0.03MPa, time 10s, solidify dwell pressure 0.35MPa, dwell time 5min.The Integrated Compressor Impeller hub portion bit organization of cast is fine and close, free of pinholes and rarefaction defect.
Specific embodiment two
Shell processed: silica sol binder SiO
2content 20%, refractory material surface layer and two layers are electro-corundum powder, sand, back-up coat is the special-purpose mullite powder of model casting, sand; Investment precoat viscosity 43s, density 2.14g/cm
3, be coated with 80# electro-corundum sand, two coating viscosity 33s, density 2.05g/cm
3, be coated with 60# electro-corundum sand, two kinds of coating for back-up coat, a kind of dope viscosity 12s, density 1.82g/cm
3, another kind of dope viscosity 28s, density 1.91g/cm
3, while being coated with reinforced layered slurry, to be first stained with rare coating, then to be stained with thick coating, hanging sand granularity is followed successively by 30-50#, 20-40#, 20-40#, 12-20#, is finally coated with the coating of one deck dope viscosity 28s; The shell that painting hangs up properly adopts autoclave to take off easy fusible pattern after placing 4h;
Shell low-temperature bake: shell shove charge is warming up to 500 ℃ of insulation 2h, is cooled to 200 ℃ of air cooling to room temperatures of coming out of the stove and deposits, 15 days resting periods with stove;
Shell high-temperature roasting: the shell of low-temperature bake carries out high-temperature roasting before cast, 1000 ℃ of shell high-temperature roasting temperature, insulation 4h, cooling with coming out of the stove after stove air cooling to 500 ℃;
Shell location clamps: low press stalk placement screen pack suitable for reading, lay chassis special, and then shell is watered to mouth down and put into above center chassis screen pack, around with alumina silicate fibre insulation material, to seal, top compresses shell;
Low pressure mold filling and solidification: while filling type cast, shell temperature is 130 ℃, 675 ℃ of aluminium liquid pouring temperatures, mold filling pressure 0.03MPa, time 10s, solidify dwell pressure 0.35MPa, dwell time 5min.The Integrated Compressor Impeller hub portion bit organization of cast is fine and close, free of pinholes and rarefaction defect.
Specific embodiment three
Shell processed: silica sol binder SiO
2content 20%, refractory material surface layer and two layers are electro-corundum powder, sand, back-up coat is the special-purpose mullite powder of model casting, sand; Investment precoat viscosity 45s, density 2.19g/cm
3, be coated with 80# electro-corundum sand, two coating viscosity 35s, density 2.1g/cm
3, be coated with 60# electro-corundum sand, two kinds of coating for back-up coat, a kind of dope viscosity 13s, density 1.83g/cm
3, another kind of dope viscosity 30s, density 1.94g/cm
3, while being coated with reinforced layered slurry, to be first stained with rare coating, then to be stained with thick coating, hanging sand granularity is followed successively by 30-50#, 20-40#, 20-40#, 12-20#, is finally coated with the coating of one deck dope viscosity 30s; The shell that painting hangs up properly adopts autoclave to take off easy fusible pattern after placing 4h;
Shell low-temperature bake: shell shove charge is warming up to 500 ℃ of insulation 2h, is cooled to 200 ℃ of air cooling to room temperatures of coming out of the stove and deposits, 30 days resting periods with stove;
Shell high-temperature roasting: the shell of low-temperature bake carries out high-temperature roasting before cast, 1000 ℃ of shell high-temperature roasting temperature, insulation 4h, cooling with coming out of the stove after stove air cooling to 500 ℃;
Shell location clamps: low press stalk placement screen pack suitable for reading, lay chassis special, and then shell is watered to mouth down and put into above center chassis screen pack, around with alumina silicate fibre insulation material, to seal, top compresses shell;
Low pressure mold filling and solidification: while filling type cast, shell temperature is 100 ℃, 680 ℃ of aluminium liquid pouring temperatures, mold filling pressure 0.03MPa, time 10s, solidify dwell pressure 0.35MPa, dwell time 5min.The Integrated Compressor Impeller hub portion bit organization of cast is fine and close, free of pinholes and rarefaction defect.
Claims (1)
1. a fusible pattern low-pressure casting process for Integrated Compressor Impeller, comprises shell processed, Baking, cast step, it is characterized in that:
(1) shell processed: silicasol case, investment precoat viscosity 40～45s, density 2.1～2.2g/cm
3, be coated with 80# electro-corundum sand, two coating viscosity 30～35s, density 2.0～2.1g/cm
3, be coated with 60# electro-corundum sand, a kind of dope viscosity 10～13s of back-up coat, density 1.81～1.83g/cm
3, another kind of dope viscosity 25～30s, density 1.85～1.95g/cm
3, adopt and to be first stained with rare coating, then be stained with thick coating be stained with paste-making method twice, be coated with 4 layers of back-up coat, hanging sand granularity is followed successively by 30～50#, 20～40#, 20～40#, 12～20#, is finally coated with the coating of one deck dope viscosity 25～30s;
(2) Baking: adopt double roasting technique, shell low-temperature bake: the shell shove charge after dewaxing is warming up to 500 ℃ of insulation 2h, is cooled to and is less than 200 ℃ of air cooling to room temperatures of coming out of the stove and deposits with stove, in 5 weeks resting periods; Shell high-temperature roasting: the shell shove charge through low-temperature bake is warming up to 1000 ℃, and insulation 4h, comes out of the stove after being less than 500 ℃ with stove air cooling, is cooled to 100～150 ℃ and pours into a mould;
(3) cast: adopt low pressure mold filling and solidification, 670～680 ℃ of pouring temperatures, mold filling pressure 0.03MPa, filling time 10s, solidify dwell pressure 0.35MPa, dwell time 5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003559.XA CN103658536A (en) | 2014-01-06 | 2014-01-06 | Fired mold low-pressure casting process of integral type compressor impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003559.XA CN103658536A (en) | 2014-01-06 | 2014-01-06 | Fired mold low-pressure casting process of integral type compressor impeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103658536A true CN103658536A (en) | 2014-03-26 |
Family
ID=50297998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410003559.XA Pending CN103658536A (en) | 2014-01-06 | 2014-01-06 | Fired mold low-pressure casting process of integral type compressor impeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103658536A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945258A (en) * | 2016-06-03 | 2016-09-21 | 扬州峰明金属制品有限公司 | Low-pressure fusible mold precise casting process |
| CN106975729A (en) * | 2017-03-07 | 2017-07-25 | 宁波麦克潘特电动工具有限公司 | A kind of lost-wax casting method of drill bit |
| CN107138680A (en) * | 2017-06-13 | 2017-09-08 | 鹰普航空零部件（无锡）有限公司 | Efficient aluminium alloy fusible pattern low pressure casting production method |
| CN109047660A (en) * | 2018-07-20 | 2018-12-21 | 珠海格力电器股份有限公司 | Impeller investment casting process, impeller and centrifugal compressor |
| CN109175305A (en) * | 2018-10-12 | 2019-01-11 | 珠海格力电器股份有限公司 | Impeller casting process and impeller |
| CN111558689A (en) * | 2020-05-22 | 2020-08-21 | 江苏科技大学 | Novel manufacturing process of impeller |
| CN114700465A (en) * | 2022-03-02 | 2022-07-05 | 中国电建集团郑州泵业有限公司 | Roasting method for final-stage guide vane investment casting formwork of double-casing pump |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089196A (en) * | 1992-03-21 | 1994-07-13 | 中国科学院长春光学精密机械研究所 | Integral precision casting process method for high-speed fan impeller |
| JP2000301289A (en) * | 1999-04-22 | 2000-10-31 | Ebara Corp | Production of lost form pattern |
| CN101235827A (en) * | 2008-03-03 | 2008-08-06 | 刘建国 | Blower fan integral wheel and method of manufacture |
| CN102019348A (en) * | 2010-12-30 | 2011-04-20 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method of low pressure guide connected hollow blade |
| CN102554125A (en) * | 2011-12-28 | 2012-07-11 | 西安西工大超晶科技发展有限责任公司 | Precision casting method of aluminum gearbox |
| CN103273010A (en) * | 2013-05-06 | 2013-09-04 | 无锡山发精铸科技有限公司 | Near net shape casting method of fine grain block casting turbine for lightweight gas turbine |
-
2014
- 2014-01-06 CN CN201410003559.XA patent/CN103658536A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089196A (en) * | 1992-03-21 | 1994-07-13 | 中国科学院长春光学精密机械研究所 | Integral precision casting process method for high-speed fan impeller |
| JP2000301289A (en) * | 1999-04-22 | 2000-10-31 | Ebara Corp | Production of lost form pattern |
| CN101235827A (en) * | 2008-03-03 | 2008-08-06 | 刘建国 | Blower fan integral wheel and method of manufacture |
| CN102019348A (en) * | 2010-12-30 | 2011-04-20 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation method of low pressure guide connected hollow blade |
| CN102554125A (en) * | 2011-12-28 | 2012-07-11 | 西安西工大超晶科技发展有限责任公司 | Precision casting method of aluminum gearbox |
| CN103273010A (en) * | 2013-05-06 | 2013-09-04 | 无锡山发精铸科技有限公司 | Near net shape casting method of fine grain block casting turbine for lightweight gas turbine |
Non-Patent Citations (1)
| Title |
|---|
| 饶国平: "低压铸造与离心铸造熔模复合型壳的应用", 《特种铸造及有色合金》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945258A (en) * | 2016-06-03 | 2016-09-21 | 扬州峰明金属制品有限公司 | Low-pressure fusible mold precise casting process |
| CN105945258B (en) * | 2016-06-03 | 2018-05-04 | 扬州峰明金属制品有限公司 | A kind of low pressure investment precision casting technology |
| CN106975729A (en) * | 2017-03-07 | 2017-07-25 | 宁波麦克潘特电动工具有限公司 | A kind of lost-wax casting method of drill bit |
| CN106975729B (en) * | 2017-03-07 | 2019-05-24 | 宁波麦克潘特电动工具有限公司 | A kind of lost-wax casting method of drill bit |
| CN107138680A (en) * | 2017-06-13 | 2017-09-08 | 鹰普航空零部件（无锡）有限公司 | Efficient aluminium alloy fusible pattern low pressure casting production method |
| CN109047660A (en) * | 2018-07-20 | 2018-12-21 | 珠海格力电器股份有限公司 | Impeller investment casting process, impeller and centrifugal compressor |
| CN109047660B (en) * | 2018-07-20 | 2019-07-05 | 珠海格力电器股份有限公司 | Impeller investment casting process, impeller and centrifugal compressor |
| CN109175305A (en) * | 2018-10-12 | 2019-01-11 | 珠海格力电器股份有限公司 | Impeller casting process and impeller |
| CN111558689A (en) * | 2020-05-22 | 2020-08-21 | 江苏科技大学 | Novel manufacturing process of impeller |
| CN114700465A (en) * | 2022-03-02 | 2022-07-05 | 中国电建集团郑州泵业有限公司 | Roasting method for final-stage guide vane investment casting formwork of double-casing pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103658536A (en) | Fired mold low-pressure casting process of integral type compressor impeller | |
| CN102091757B (en) | Integral precision casting method for large thin-wall casing part | |
| CN102717030B (en) | Precision casting method for thick-wall base aluminium alloy casting | |
| CN105834363B (en) | A kind of low pressure loses the close casting system of cerotin | |
| US7318466B2 (en) | Lost wax casting method | |
| CN101391298B (en) | Aluminium alloy or magnesium alloy evaporative-pattern casting compression solidification device | |
| CN105483440A (en) | Environment-friendly type preparation method for automobile engine blade | |
| CN103302242A (en) | Precise casing method of tiles of floating wall of combustion chamber of aeroengine | |
| CN105537518A (en) | Preparation method of engine component | |
| CN102836963B (en) | Support casting process | |
| CN104399891A (en) | Casting method combining investment precise shell-making process with vacuum suction molding technology | |
| WO2017114066A1 (en) | Environmentally friendly method for preparing automobile engine shell | |
| CN105506377A (en) | Environment-friendly type manufacturing method for car supercharging turbine | |
| CN105618679A (en) | Preparation method for automobile charging turbine | |
| CN102717029A (en) | Casting method for large thin-wall shell aluminium alloy casting | |
| CN104923729A (en) | Manufacturing method of composite shell of large diffuser precision casting | |
| CN105057593A (en) | Investment casting technology for copper alloy casting | |
| CN103469017B (en) | Aluminum alloy for precision casting and casting method thereof | |
| CN104972062A (en) | Manufacturing process of high-temperature alloy turbine | |
| CN104646605A (en) | Coating for cast aluminum alloy | |
| CN102699279A (en) | Large-size impeller processing technique in precise casting | |
| CN112139451A (en) | Investment casting process of complex thin-wall hollow aluminum alloy aviation part | |
| CN111203514A (en) | Precision casting method for high-temperature alloy complex thin-wall casting | |
| CN110640085A (en) | Investment casting process for hollow casting | |
| CN105945258B (en) | A kind of low pressure investment precision casting technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |