CN101559484A - Vacuum gravity casting method of aircraft engine block - Google Patents
Vacuum gravity casting method of aircraft engine block Download PDFInfo
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- CN101559484A CN101559484A CNA2009101039652A CN200910103965A CN101559484A CN 101559484 A CN101559484 A CN 101559484A CN A2009101039652 A CNA2009101039652 A CN A2009101039652A CN 200910103965 A CN200910103965 A CN 200910103965A CN 101559484 A CN101559484 A CN 101559484A
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Abstract
The invention relates to a vacuum gravity casting method of an aircraft engine block. The method comprises the following steps: graphite paint is dipped on the surface of a mesoporous sand core of a die used for gravity casting, chilling coating is coated at the part of the die used for gravity casting close to an air passage, a sealing cabin provided with the die is vacuumized before casting through a snake-shaped casting opening, and the mesoporous sand core and the sealing cabin are filled with compressed air after casting. Due to the adoption of the closed vacuum casting, the casting is performed through the snake-shaped casting opening, and as the graphite paint and the chilling coating are adopted, the compressed air is blown in the mesopore to carry the heat away, the shrinkage cavities in the casting part are greatly reduced, the qualification rate of the finished products of the casting part is improved to about 90 percent from 20 percent and the production cost is greatly reduced.
Description
Technical field
The present invention relates to the engine casting field, more particularly, relate to a kind of vacuum gravity casting method of aircraft engine block.
Background technology
A kind of aluminium alloy cylinder of aircraft engine, foundry goods basic size is 160mm * 140mm * 145mm, casting weight 1.64Kg, the foundry goods profile is made up of 8 groups of fin, be convenient to be the engine cylinder-body heat radiation, the about 1.5mm of vane tip thickness, because blade is long and thin, the blade outward appearance is easy to generate cold shut and misrun.In diameter is arranged is the mesopore of 60mm, be the space of piston motion, this product is made foundry goods earlier, foundry goods forms product after machined.The blank hole internal diameter is 56mm, and the mesopore middle part is linked with an air flue.The internal diameter of this foundry goods mesopore is 56mm, is 60mm through polishing processing back.With the aluminium alloy cylinder cast(ing) surface of the produced aircraft engine of existing gravitational casting technology by machined after, pore or shrinkage cavity are often exposed in the surface, especially be the waste product that to save having the aluminium alloy cylinder foundry goods of the aircraft engine of pore or shrinkage cavity, can not use near position, air flue position.Like this, causing the qualification rate of the aluminium alloy cylinder foundry goods of aircraft engine is 20% only, and quality cost significantly rises, substantially can not ordinary production, be difficult to guarantee the batch process needs of aircraft engine block.
Summary of the invention
The technical problem to be solved in the present invention is, at the low defective of the above-mentioned casting finished products qualification rate of prior art gravitational casting, provides the vacuum gravity casting method of the high aircraft engine block of a kind of product qualified rate.
The technical solution adopted for the present invention to solve the technical problems is: a kind of vacuum gravity casting method of aircraft engine block is provided, comprises the following steps:
S1: soak on the mesopore core surface of the aircraft engine block mould that is used for gravitational casting and to wash graphite paint, the part of the close air flue of mould add be coated with Quench coating after, the air flue core is bonded on the mesopore core, be placed on the counterdie together, after the left and right half module of mould and counterdie close film, mould, the holding furnace that closes behind the film placed in the sealed compartment of a vacuum-pumping; Vavuum pump is connected by the tracheae that has vacuum two-way valve switch with sealed compartment, vavuum pump is connected by the tracheae that has air switch with the cavity of mesopore core;
S2: after changing holding furnace over to after the aluminum alloy melt melting finished, the close encapsulation cabin;
S3: open vacuum two-way valve switch,, make the vacuum in the sealed compartment reach 12mmHg-0mmHg with the air in the sealed compartment of vavuum pump extraction vacuum-pumping;
S4:, the aluminum alloy melt in the holding furnace is poured in the die cavity of mould formation then with manipulator and snakelike sprue gate in the sealed compartment by being provided with on the mould;
S5: cast is opened air switch after finishing, and air is entered quicken aluminum alloy melt in the mesopore core to cool off in mould, opens the vacuum two-way valve in second at 0-5 immediately, allows 3-7Kgf/cm
2Compressed air enter in the sealed compartment, in the aircraft engine block casting solidification process, foundry goods is carried out feeding;
S6: treated the foundry goods cooled and solidified 3-6 minute, and opened sealed compartment, take out the aircraft engine block foundry goods.
Among the described step S2, the temperature in the holding furnace is 710-750 ℃.
Among the described step S4, the pouring temperature of aluminum alloy melt is 725-750 ℃.
Described Quench coating is magnesium sand powder Quench coating or tellurium powder Quench coating.
The vacuum gravity casting method of aircraft engine block of the present invention has following beneficial effect:
The first, before the aluminum alloy melt cast, close sealed compartment, open vavuum pump, at this moment, air is drawn out of in the aluminum alloy melt from mould.By the time vacuumize and finish, the cast aluminum alloy melt enters mould, and overcome foundry goods and produced pore owing to not having air in mould, the aluminum alloy melt this moment; Open the air switch on the tracheae behind the casting complete, air is entered quicken aluminum alloy melt in the mesopore core and in mould, cool off, open the vacuum two-way valve in second at 0-5 immediately, allow 3-7Kgf/cm
2Compressed air enter in the sealed compartment, foundry goods is in contraction state at this moment, external compressed-air actuated atmospheric pressure acts on the port area of emitting of feeding, aluminum alloy melt carries out feeding to foundry goods in the rising head, adds the effect of air pressure, better foundry goods is carried out feeding.Overcome foundry goods so greatly because shrink the shrinkage cavity that produces, reduced the pore or the shrinkage cavity that come out after the cylinder body processing.Thin blade outward appearance is also because under the vacuum state, and aluminium alloy is mobile better, and the foundry goods outward appearance is clear full.
The second, because the mesopore of foundry goods is to use the core moulding, and the core conductivity of heat is poor, the inner surface cooling of foundry goods is slow in the production, and external aluminum alloy melt feeding difficulty (skin solidifies) causes endoporus perienchyma loose, exposes casting flaw after the processing.Take on core, to brush special Quench coating, make the faster cooling of the aluminum alloy surface that contacts with core, because the existence of Quench dope layer does not have pore or shrinkage cavity after the endoporus processing.
The 3rd, in the core mesopore, adopt the bubbling air type of cooling to take away a large amount of heats that accumulate in the core, more help consecutive solidification, well solved the quality problems that exist.Casting qualified rate has improved to more than 90% from 20%, has satisfied client's needs, and enterprise has also reduced production cost.
In sum, the present invention adopts totally enclosed type vacuum pressing and casting, and pour into a mould by snakelike sprue gate, the filling of aluminium liquid is steady when making cast, and can make the bits in the aluminum alloy melt be deposited on the recess at snakelike sprue gate and not enter the foundry goods cylinder body, therefore the length of foundry goods and thin blade easier moulding under vacuum state, outward appearance is fuller and clear; Owing to extracted the air in mould and the aluminum alloy melt out, the pore in the foundry goods significantly reduces; Because charge into compressed air after having adopted cast to finish, back-pressure acts on aluminum alloy surface and the feeding cap mouth in the casting solidification process, and foundry goods has been carried out sufficient feeding, reduced the possibility of foundry goods formation shrinkage cavity.Take away heat because of adopting graphite paint, Quench coating and be blown into air in the core mesopore again, shrinkage cavity significantly reduces in the foundry goods, and casting qualified rate increases substantially about 90% by 20%, and production cost reduces significantly, has satisfied client's needs.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of the equipment that vacuum gravity casting method adopted of a kind of aircraft engine block of the present invention;
Fig. 2 be among Fig. 1 A-A to cutaway view;
Fig. 3 is the flow chart of the vacuum gravity casting method of a kind of aircraft engine block of the present invention.
Description of reference numerals: 1. left half module, 2. snakelike running channel, 3. right half module, 4. air flue core, 5. Pressure gauge, 6. air switch, 7. shrinkage cavity defect is 8. processed back bore area, 9. tracheae, 10. mesopore core, 11. foundry goods cylinder bodies, 12. rising heads, 13. ejecting mechanism, 14. counterdies, 15. vacuum two-way valves, 16. vavuum pump, 17. sealed compartments, 18. holding furnaces
The specific embodiment
Fig. 1 is the structural representation of the equipment that vacuum gravity casting method adopted of a kind of aircraft engine block of the present invention; Fig. 2 be among Fig. 1 A-A to cutaway view.With reference to figure 1 and Fig. 2, a preferred embodiment of the vacuum gravity casting method of a kind of aircraft engine block of the present invention is as follows:
Before the cast, soak on mesopore core 10 surfaces of the mould that is used for gravitational casting and to wash graphite paint, the part of the close air flue of mould add be coated with Quench coating after as magnesium sand powder Quench coating or tellurium powder Quench coating, also available BN-C815 Quench coating (above-mentioned Quench coating is widely used Quench coating in the existing foundary industry), air flue core 4 is bonded on the mesopore core 10, be placed on together on the counterdie 14, the left side of mould, after right half module and counterdie close film, with the mould that closes behind the film, holding furnace places in the sealed compartment 17 of a vacuum-pumping, the close encapsulation cabin 17 then, holding furnace 18 will be changed over to after the aluminum alloy melt melting, temperature in the holding furnace remains on 710-750 ℃, open vacuum two-way valve 15, vavuum pump 16 is started working, extract out in the sealed compartment 17 and the air in the mold cavity, and the gas in the aluminum alloy melt in the holding furnace 18, when vacuum reaches 12-0mmHg, under air-tight state, from holding furnace 18, pour into a mould aluminum alloy melt, with manipulator in the sealed compartment and snakelike sprue gate by being provided with on the mould, aluminum alloy melt in the holding furnace is poured in the die cavity of mould formation, the pouring temperature of aluminum alloy melt is 725-750 ℃, aluminum alloy melt enters rising head 12 after being filled with the mould shape chamber of foundry goods cylinder body 11, after cast finishes, open the air switch 6 on the tracheae, making air enter the interior aluminum alloy melt that quickens of mesopore core cools off in mould, especially the surperficial aluminum alloy melt of mesopore core 10 quickens cooling, open the vacuum two-way valve in second at 0-5 immediately, promptly allow 3-7Kgf/cm
2Compressed air enter in the sealed compartment 17 by tracheae 9, this moment, vacuum two-way valve 15 was oppositely to the sealed compartment 17 inner pressure that increase, compressed air is in casting solidification process, back-pressure acts on aluminum alloy surface and the feeding cap mouth 12, aluminum alloy melt in the rising head 12 carries out feeding, has reduced the possibility of foundry goods cylinder body 11 endoporus formation shrinkage cavity defect 7.Foundry goods cylinder body 11 is carried out sufficient feeding, reduced the possibility of foundry goods formation shrinkage cavity.Treat the foundry goods cooled and solidified 3-6 minute, and opened sealed compartment 17.Left side half module 1, right half module 3 and counterdie 14 sliding openings, ejecting mechanism 13 ejects foundry goods.Through after the above measure, the possibility that forms shrinkage cavity defect 7 on the bore area 8 after 11 machineds of aircraft engine foundry goods cylinder body significantly reduces.
Fig. 3 is the flow chart of the vacuum gravity casting method of a kind of aircraft engine block of the present invention.Referring to figs. 1 to Fig. 3, method of the present invention comprises the following steps:
S1: soak on mesopore core 10 surfaces of the mould that is used for gravity-assist pouring and to wash graphite paint, the part of the close air flue of mould add be coated with Quench coating after, air flue core 4 is bonded on the mesopore core 10, be placed on together on the counterdie 14, behind left and right half module and the counterdie matched moulds, mould behind the matched moulds, holding furnace 18 are placed the sealed compartment 17 of a vacuum-pumping, vavuum pump is connected by the tracheae that has vacuum two-way valve switch with sealed compartment, vavuum pump is connected by the tracheae that has air switch with the cavity of mesopore core;
S2: after changing holding furnace 18 over to after the aluminum alloy melt melting finished, close encapsulation cabin 17;
S3: open vacuum two-way valve switch 15,, make the vacuum in the sealed compartment reach 12-0mmHg with the air that vavuum pump 16 is extracted out in the sealed compartment 17;
S4:, the aluminum alloy melt in the holding furnace 18 is poured in the die cavity of mould formation then with manipulator and snakelike sprue gate in the sealed compartment by being provided with on the mould;
S5: cast is opened air switch 6 after finishing, and air is entered quicken aluminum alloy melt in the mesopore core to cool off in mould, opens the vacuum two-way valve in second at 0-5 immediately, allows 3-7Kgf/cm
2Compressed air enter in the sealed compartment 17 by tracheae, in casting solidification process, foundry goods is carried out feeding;
S6: treated the foundry goods cooled and solidified 3-6 minute, and opened sealed compartment 18, take out foundry goods.
Claims (4)
1, a kind of vacuum gravity casting method of aircraft engine block is characterized in that, comprises the following steps:
S1: soak on the mesopore core surface of the aircraft engine block mould that is used for gravitational casting and to wash graphite paint, the part of the close air flue of mould add be coated with Quench coating after, the air flue core is bonded on the mesopore core, be placed on the counterdie together, after the left and right half module of mould and counterdie close film, mould, the holding furnace that closes behind the film placed in the sealed compartment of a vacuum-pumping; Vavuum pump is connected by the tracheae that has vacuum two-way valve switch with sealed compartment, vavuum pump is connected by the tracheae that has air switch with the cavity of mesopore core;
S2: after changing holding furnace over to after the aluminum alloy melt melting finished, the close encapsulation cabin;
S3: open vacuum two-way valve switch,, make the vacuum in the sealed compartment reach 12mmHg-0mmHg with the air in the sealed compartment of vavuum pump extraction vacuum-pumping;
S4:, the aluminum alloy melt in the holding furnace is poured in the die cavity of mould formation then with manipulator and snakelike sprue gate in the sealed compartment by being provided with on the mould;
S5: cast is opened air switch after finishing, and air is entered quicken aluminum alloy melt in the mesopore core to cool off in mould, opens the vacuum two-way valve in second at 0-5 immediately, allows 3-7Kgf/cm
2Compressed air enter in the sealed compartment, in the aircraft engine block casting solidification process, foundry goods is carried out feeding;
S6: treated the foundry goods cooled and solidified 3-6 minute, and opened sealed compartment, take out the aircraft engine block foundry goods.
2, the vacuum gravity casting method of aircraft engine block according to claim 1 is characterized in that, among the described step S2, the temperature in the holding furnace is 710-750 ℃.
3, the vacuum gravity casting method of aircraft engine block according to claim 1 is characterized in that, among the described step S4, the pouring temperature of aluminum alloy melt is 725-750 ℃.
4, the vacuum gravity casting method of aircraft engine block according to claim 1, described Quench coating are magnesium sand powder Quench coating or tellurium powder Quench coating.
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| CN2009101039652A CN101559484B (en) | 2009-05-27 | 2009-05-27 | Vacuum gravity casting method of aircraft engine block |
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| CN2009101039652A CN101559484B (en) | 2009-05-27 | 2009-05-27 | Vacuum gravity casting method of aircraft engine block |
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| CN103506605A (en) * | 2012-06-25 | 2014-01-15 | 无锡市蠡湖铸业有限公司 | Sprue-free vacuum sucking and injecting equipment of manipulator |
| CN103878344A (en) * | 2012-12-21 | 2014-06-25 | 陕西宏远航空锻造有限责任公司 | Aluminum alloy casting preparing method |
| CN103934435A (en) * | 2014-05-19 | 2014-07-23 | 海门市沪海有色铸造有限公司 | Method for solving problems caused by hot spots at large-thickness positions of casting through cooperation of chilling coatings and hidden air holes |
| CN104128558A (en) * | 2014-08-19 | 2014-11-05 | 成都桐林铸造实业有限公司 | Casting process for solving leakage and sand bonding |
| CN104289670A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing hexagonal hole in casting manner |
| CN104550879A (en) * | 2013-10-20 | 2015-04-29 | 宁夏嘉翔自控技术有限公司 | Energy-saving large casting cooling device |
| CN107511459A (en) * | 2017-08-30 | 2017-12-26 | 信阳同合车轮有限公司 | Railway cast steel wheel V method graphite Quench gravity foundry technologies |
| CN107737904A (en) * | 2017-10-20 | 2018-02-27 | 苏州市天星山精密模具有限公司 | A kind of casting technique for being used to prepare injection mold |
| CN108015258A (en) * | 2016-11-04 | 2018-05-11 | 吕培建 | A kind of casting method of cylinder |
Family Cites Families (5)
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| JP2849508B2 (en) * | 1992-08-11 | 1999-01-20 | 友和産業株式会社 | High differential pressure ultra-fine casting method for light specific gravity metals |
| US6467531B1 (en) * | 1999-10-18 | 2002-10-22 | Clyde D. Doney | Method and apparatus for producing investment castings in a vacuum |
| CN1302875C (en) * | 2005-04-20 | 2007-03-07 | 王一诚 | Vacuum, gravity and precision casting method with metallic mould |
| CN101058115A (en) * | 2007-06-11 | 2007-10-24 | 清华大学 | Method for vacuum auxiliary gravity pouring investment casting thin wall piece |
| CN101199991B (en) * | 2007-12-10 | 2010-07-21 | 西北有色金属研究院 | Gravitational vacuum suction casting forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103506605A (en) * | 2012-06-25 | 2014-01-15 | 无锡市蠡湖铸业有限公司 | Sprue-free vacuum sucking and injecting equipment of manipulator |
| CN103878344A (en) * | 2012-12-21 | 2014-06-25 | 陕西宏远航空锻造有限责任公司 | Aluminum alloy casting preparing method |
| CN104550879A (en) * | 2013-10-20 | 2015-04-29 | 宁夏嘉翔自控技术有限公司 | Energy-saving large casting cooling device |
| CN103934435A (en) * | 2014-05-19 | 2014-07-23 | 海门市沪海有色铸造有限公司 | Method for solving problems caused by hot spots at large-thickness positions of casting through cooperation of chilling coatings and hidden air holes |
| CN103934435B (en) * | 2014-05-19 | 2017-01-04 | 海门市沪海有色铸造有限公司 | Method for solving problem of hot spot generated at wall thickness of aluminum alloy casting by using chilling coating and dark air hole in matched mode |
| CN104128558A (en) * | 2014-08-19 | 2014-11-05 | 成都桐林铸造实业有限公司 | Casting process for solving leakage and sand bonding |
| CN104128558B (en) * | 2014-08-19 | 2016-01-27 | 成都桐林铸造实业有限公司 | A kind of casting technique solving seepage and scab |
| CN104289670A (en) * | 2014-10-30 | 2015-01-21 | 沈阳工业大学 | Method for manufacturing hexagonal hole in casting manner |
| CN108015258A (en) * | 2016-11-04 | 2018-05-11 | 吕培建 | A kind of casting method of cylinder |
| CN107511459A (en) * | 2017-08-30 | 2017-12-26 | 信阳同合车轮有限公司 | Railway cast steel wheel V method graphite Quench gravity foundry technologies |
| CN107737904A (en) * | 2017-10-20 | 2018-02-27 | 苏州市天星山精密模具有限公司 | A kind of casting technique for being used to prepare injection mold |
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| CN101559484B (en) | 2010-12-08 |
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Effective date of registration: 20160111 Address after: 400054 Banan District, Chongqing building Avenue, No. 2, building 1 Patentee after: CHONGQING CONSTRUCTION ELECTROMECHANICAL CO., LTD. Address before: 400054 Huaxi Industrial Park, Banan District, Chongqing Road, No. 1 Patentee before: Chongqing Jianshe Motorcycle Co., Ltd. |
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