CN104624976A - Method for forming slender pipeline having large length-to-diameter ratio for magnesium alloy casting - Google Patents
Method for forming slender pipeline having large length-to-diameter ratio for magnesium alloy casting Download PDFInfo
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- CN104624976A CN104624976A CN201310576874.7A CN201310576874A CN104624976A CN 104624976 A CN104624976 A CN 104624976A CN 201310576874 A CN201310576874 A CN 201310576874A CN 104624976 A CN104624976 A CN 104624976A
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Abstract
The invention aims to provide a method for forming a slender pipeline having a large length-to-diameter ratio for a magnesium alloy casting. The method is characterized by comprising the following steps: pouring by using an aluminium pipe bended and formed in advance as a core material, and then, removing the aluminium pipe by using a caustic alkali solution or hydrofluoric acid solution. The method is applied to production of the magnesium alloy casting with the slender pipeline having the large length-to-diameter ratio and little change of hole section. The magnesium alloy casting with the slender pipeline is produced by using the method; therefore, the production process is simple; furthermore, the pipeline is convenient to clean; the hole wall surface of the casting is good in finish degree and high in density; and both the gas tightness and the hydraulic pressure resistant property of the pipeline are good.
Description
Technical field
The invention belongs to magnesium alloy cast technical field, specifically provide a kind of manufacturing process for Mg alloy castings pipeline.
Background technology
Along with the requirement that aircraft of new generation and engine improve constantly aspect of performance, the parts of additional a large amount of conduit more can not reach designing requirement, designer more and more tends to directly make complex pipeline on part, the part of this integrated a large amount of pipeline makes the structure of aircraft and engine thereof be simplified, and therefore performance and reliability are also more improved.Pipe section on this kind of part is generally rounded, and diameter is in the majority 3 ~ 15mm person, and pipeline is changeable in axial direction complications, and requires to have higher intensity and compactness.Past pipe forming passage often adopts the way of machining, but the method that machine adds can not form the deep hole compared with big L/D ratio, and there is chip to be difficult to remove clean, plug leakiness wet goods problem, external employing now directly casts out the way of elongate conduit on foundry goods, not only preferably resolve the problems referred to above, also help the flowing of liquid and the maintenance of pressure and transmission, thus improve the serviceability of parts.
The shaping of elongate conduit is always a difficult problem, and in the sand casting process of Al alloys andMg alloys, the shaping of elongate conduit adopts the resin sand core relatively with higher-strength usually, as film covered sand core.This types of core is at some the inner aviation aluminium containing elongate curved oil pipe, Mg alloy castings obtains successful Application, but also easily there is some problem in the method: first in process of production, after cast, the retained strength of sand cores of castings is large, cleaning difficulty, especially for Mg alloy castings, core after casting usually all can not be defeated and dispersed well, and the heat treatment temperature of magnesium alloy is low, reducing atmosphere is strong, residual core also cannot realize effectively defeated and dispersed and remove in heat treatment process, special in the elongate conduit with big L/D ratio, the difficulty of sand removal is very huge.
Secondly, the bending strength of sand mold core is usually lower, normal temperature bending strength as JB/T8583 " casting precoated sand " regulation highest level precoated sand is only 8MPa, hot bending strength is only 1.5 ~ 4MPa, elongated sand mold core very easily ruptures, and in actual production, very difficult use sand mold core produces the elongate conduit compared with big L/D ratio.
Finally, the elongate conduit rough surface adopting sand mold core to be shaped, easily residual sand grains, in use can block the liquid flow in pipeline, if residual sand grains in use comes off, produces significant damage by the safe operation of equipment.
The appearance of the problems referred to above, greatly limit aircraft and the raising of engine in Performance And Reliability thereof.For overcoming the various problems of core casting elongate conduit, be necessary to develop one for elongate conduit, the particularly forming technique of big L/D ratio elongate conduit.
Summary of the invention
The object of the present invention is to provide a kind of manufacturing process for Mg alloy castings big L/D ratio elongate conduit, it is little that the method is applicable to hole changes of section, but the elongate conduit Mg alloy castings with very big L/D ratio is produced.Uses the method to produce containing the Mg alloy castings of elongate conduit, not only production technology is simple, pipeline cleaning is easy to clean, and foundry goods hole wall surface fineness is good, density is high, pipeline air-tightness and hydraulic pressure resistant functional.
The present invention specifically provides a kind of manufacturing process for Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: adopt and bend shaping aluminum pipe in advance as core material, after cast, use caustic solution or hydrofluoric acid solution to remove aluminum pipe (preferred caustic solution).
Manufacturing process for Mg alloy castings big L/D ratio elongate conduit of the present invention, is characterized in that: use air-cooled control aluminum pipe temperature during cast.(wherein the gas outlet gas temperature of discharging is not higher than 300 DEG C.）
In pipeline, pass into refrigerating gas in casting process to prevent aluminum pipe temperature too high, test finds that the gas temperature of discharging gas outlet is not higher than under the condition of 300 DEG C, and aluminum pipe can not melt and produce larger dilatancy.Aluminum pipe wall thickness, length of pipe that wall thickness for pipeline is not more than more than 5 times are not more than the Mg alloy castings of 300mm, also can cool aluminum pipe, but will insert filler as dry sand and so on, to simplify the operation at aluminum pipe in-core.
Manufacturing process for Mg alloy castings big L/D ratio elongate conduit of the present invention, is characterized in that: before cast, carry out surface thoroughly oil removing dry or carry out anodization to aluminum pipe to aluminum pipe.
The tube core that surface is polluted by exogenous impurities such as oil stain, rusty stain, water, if be directly used for casting as core, will produce fiery problem of choking in various degree in casting process.For preventing the generation of this problem, need carry out the thorough oil removing in surface to the aluminum pipe core prepared and could use after drying, the present invention's oil removing process used can refer to CB/T3760 " Chemical cleaning of steel pipe, copper pipe, aluminum pipe " or has the additive method of similar cleaning performance.
Because the surface after aluminium alloy anodization process has higher cleannes, and anode oxide film is conducive to aluminum pipe core in magnesium liquid, keep stable, and anodizing process therefore also can be adopted to substitute oil removing process.Anode oxide film in the present invention can refer to GB/T8013 " Al and Alalloy anode oxide film specification ".
Manufacturing process for Mg alloy castings big L/D ratio elongate conduit of the present invention, is characterized in that: preferably adopt wall thickness to be the aluminum pipe of 1 ~ 3mm.
The aluminum pipe material that market is sold mainly contains fine aluminium and all kinds of alloy aluminum, the low price of pure aluminum tube, and caliber is complete in specifications, and shaping and welding easily; The price of alloy aluminum pipe is relatively high, is relatively not easy distortion after being bent into tube core.Test shows no matter pure aluminum tube or alloy aluminum pipe all can meet instructions for use.
For the aluminum pipe of caliber at below 30mm, tube wall is blocked up not only not easily to be bent shaping, and will greatly extend the depoling time when the later stage removes tube core; And tube wall is excessively thin, the difficulty that aluminum pipe core bends will be strengthened, and at the parcel of high temperature magnesium liquid and under washing away, thickness of pipe wall is spent thin aluminum pipe and is easy to be fused.Found through experiments, for the aluminum pipe of diameter specifications at below 30mm, the wall thickness of 1 ~ 3mm can meet instructions for use.
Manufacturing process for Mg alloy castings big L/D ratio elongate conduit of the present invention, is characterized in that, concrete forming technology is as follows:
(1), the preparation of aluminum pipe core
Select the aluminum pipe of wall thickness 1 ~ 3mm as core material, aluminum pipe is bent into required form and makes aluminum pipe core; For there being cross-coupled aluminum pipe core, welding again after needing on the main line tube wall of junction punching, correcting the close inspection of the laggard promoting the circulation of qi of shape through dimension control, requiring that all pipelines keep unimpeded and do not reveal;
(2), the use of aluminum pipe core
Be placed in casting mold by the aluminum pipe core prepared, select one end core print to be fixed on casting mold, this end is called stiff end; All the other core prints can not be fixed, and are called free end; The core print of aluminum pipe core will grow casting mold (as shown in Figure 1), and the core print of stiff end connects the gas path pipe of cooling; In pipeline, refrigerating gas is passed into prevent aluminum pipe temperature too high in casting process;
Need at casting mold and the good carbon black of aluminum pipe wicking surface Yu Xian Smoked before mould assembling, after mould assembling, connect the gas path pipe of cooling at stiff end core print.
(3), the removing of aluminum pipe core
After casting complete, with caustic solution, aluminum pipe core is removed from Mg alloy castings.
Manufacturing process for Mg alloy castings big L/D ratio elongate conduit of the present invention, is characterized in that: the method is particularly useful for the elongate conduit that draw ratio is 10:1≤draw ratio≤200:1.
Distinguishing feature of the present invention and Substantial technical progress have:
1, the die material adopting aluminum pipe to be shaped as Mg alloy castings elongate conduit, can be formed with the elongate conduit compared with big L/D ratio on Mg alloy castings, method is reliably easy.
2, adopt the good aluminum pipe of solderability to be die material, the tube core of various complexity can be formed by assembly welding neatly, and then produce the Mg alloy castings containing complex pipeline.
3, in casting process, control the temperature of aluminum pipe core, make that the crystal grain of foundry goods hole wall is tiny, density improves, the air-tightness of pipeline and resistance to pressure are also corresponding to be improved.
4, tube core cleaning easy to clean, foundry goods tube wall surface fineness is good, density is high, foundry goods oil pipe air-tightness and hydraulic pressure resistant performance good;
5, core cast magnesium alloy foundry goods of the present invention is utilized, the surface smoothness of foundry goods tube wall and the density of tissue can be significantly improved, the foundry goods oil circuit liquid communication of producing is smooth and easy, stand certain hydraulic pressure and non-leakage, and the energy consumption of auxiliary component reduces, and service life is improved.
The present invention is the pioneering method of current non-pipe laying Foundry Production big L/D ratio pipeline Mg alloy castings, the method simple and reliable process, the Mg alloy castings pipeline surface smoothness produced is good, density is high, foundry goods oil pipe air-tightness and hydraulic pressure resistant performance good, the energy consumption of auxiliary component reduces and can be improved service life, simplify the component structural that some needs integrated a large amount of conduit to a great extent, improve its serviceability.
Accompanying drawing explanation
Fig. 1 aluminum pipe core is positioned on the schematic diagram in casting mold;
Fig. 2 has cross-coupled aluminum pipe core schematic diagram;
Aluminum pipe core schematic diagram after Fig. 3 punches on the main line tube wall of junction.
Detailed description of the invention
Embodiment 1
(1), the preparation of aluminum pipe core
Select the aluminum pipe of wall thickness 1mm as core material, aluminum pipe is bent into required form and makes aluminum pipe core; For there being cross-coupled aluminum pipe core (as Fig. 1), welding again (as Fig. 2) after needing on the main line tube wall of junction punching, correcting the close inspection of the laggard promoting the circulation of qi of shape through dimension control, requiring that all pipelines keep unimpeded and do not reveal;
(2), the use of aluminum pipe core
Be placed in casting mold by the aluminum pipe core prepared, wherein core print glue in one end is fixed on casting mold, and this end is called stiff end; All the other core prints are not fixed, and are called free end; The core print of aluminum pipe core will grow casting mold, and the core print of stiff end connects the gas path pipe of cooling; In pipeline, refrigerating gas is passed into prevent aluminum pipe temperature too high in casting process, need at casting mold and the good carbon black of aluminum pipe wicking surface Yu Xian Smoked before mould assembling, connect the compressed air piping of cooling after mould assembling at stiff end core print, the gas temperature controlling to discharge gas outlet is not higher than 300 DEG C;
(3), the removing of aluminum pipe core
After casting complete, with caustic solution, aluminum pipe core is removed from Mg alloy castings, final obtained draw ratio is the elongate conduit of 200:1, gained Mg alloy castings pipeline surface smoothness is good, its surface roughness can reach Ra3.2, compactness is high, can ensure that oil pipe 5min under 0.7MPa air pressure conditions does not reveal.
Embodiment 2
Be with the difference of embodiment 1: select the aluminum pipe of wall thickness 2mm as core material, final obtained draw ratio is the elongate conduit of 100:1.Gained Mg alloy castings pipeline surface smoothness is good, and its surface roughness can reach Ra3.2, and compactness is high, can ensure that oil pipe 5min under 0.7MPa air pressure conditions does not reveal.
Embodiment 3
Be with the difference of embodiment 1: select the aluminum pipe of wall thickness 3mm as core material, final obtained draw ratio is the elongate conduit of 10:1.Gained Mg alloy castings pipeline surface smoothness is good, and its surface roughness can reach Ra3.2, and compactness is high, can ensure that oil pipe 5min under 0.7MPa air pressure conditions does not reveal.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (9)
1. for a manufacturing process for Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: adopt and bend shaping aluminum pipe in advance as core material, after cast, use caustic solution or hydrofluoric acid solution to remove aluminum pipe.
2. according to described in claim 1 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: during cast, use air-cooled control aluminum pipe temperature.
3. according to described in claim 2 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: when using air-cooled control aluminum pipe temperature, the gas temperature that gas outlet is discharged is not higher than 300 DEG C.
4. according to described in claim 1 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: cast after use caustic solution remove aluminum pipe.
5. according to the arbitrary described manufacturing process for Mg alloy castings big L/D ratio elongate conduit of Claims 1 to 4, it is characterized in that: before cast, carrying out surface to aluminum pipe, thoroughly oil removing is also dry.
6. according to described in Claims 1 to 4 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: before cast, anodization is carried out to aluminum pipe.
7. according to described in Claims 1 to 4 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: adopt wall thickness be the aluminum pipe of 1 ~ 3mm.
8. according to described in claim 1 for the manufacturing process of Mg alloy castings big L/D ratio elongate conduit, it is characterized in that, concrete forming technology is as follows:
(1), the preparation of aluminum pipe core
Select the aluminum pipe of wall thickness 1 ~ 3mm as core material, aluminum pipe is bent into required form and makes aluminum pipe core; For there being cross-coupled aluminum pipe core, welding again after needing on the main line tube wall of junction punching, correcting the close inspection of the laggard promoting the circulation of qi of shape through dimension control, requiring that all pipelines keep unimpeded and do not reveal;
(2), the use of aluminum pipe core
Be placed in casting mold by the aluminum pipe core prepared, select one end core print to be fixed on casting mold, this end is called stiff end; All the other core prints can not be fixed, and are called free end; The core print of aluminum pipe core will grow casting mold, and the core print of stiff end connects the gas path pipe of cooling; In pipeline, refrigerating gas is passed into prevent aluminum pipe temperature too high in casting process;
(3), the removing of aluminum pipe core
After casting complete, with caustic solution, aluminum pipe core is removed from Mg alloy castings.
9., according to Claims 1 to 4,8 arbitrary described manufacturing process for Mg alloy castings big L/D ratio elongate conduit, it is characterized in that: the draw ratio of big L/D ratio elongate conduit is 10:1≤draw ratio≤200:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310576874.7A CN104624976A (en) | 2013-11-14 | 2013-11-14 | Method for forming slender pipeline having large length-to-diameter ratio for magnesium alloy casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310576874.7A CN104624976A (en) | 2013-11-14 | 2013-11-14 | Method for forming slender pipeline having large length-to-diameter ratio for magnesium alloy casting |
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| CN104624976A true CN104624976A (en) | 2015-05-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109746646A (en) * | 2019-03-18 | 2019-05-14 | 苏州瑞森硬质合金有限公司 | A kind of alloy rod production process containing deep hole |
| CN114082894A (en) * | 2021-11-10 | 2022-02-25 | 中国航发南方工业有限公司 | Casting method for thin-wall casting and special-shaped section pipeline sand core |
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| CN1217958A (en) * | 1997-11-26 | 1999-06-02 | 北京航空航天大学 | Process for making cores for casting process |
| CN102059321A (en) * | 2010-12-10 | 2011-05-18 | 西安航空动力控制科技有限公司 | Mold core and preparation method thereof and method for producing casting inner cavity by using mold core |
| CN102294437A (en) * | 2010-05-28 | 2011-12-28 | 铃木株式会社 | Water soluble core removing method and device |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1217958A (en) * | 1997-11-26 | 1999-06-02 | 北京航空航天大学 | Process for making cores for casting process |
| CN102294437A (en) * | 2010-05-28 | 2011-12-28 | 铃木株式会社 | Water soluble core removing method and device |
| CN102059321A (en) * | 2010-12-10 | 2011-05-18 | 西安航空动力控制科技有限公司 | Mold core and preparation method thereof and method for producing casting inner cavity by using mold core |
| CN102786295A (en) * | 2012-08-06 | 2012-11-21 | 江苏大学 | Water-soluble ceramic core and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109746646A (en) * | 2019-03-18 | 2019-05-14 | 苏州瑞森硬质合金有限公司 | A kind of alloy rod production process containing deep hole |
| CN114082894A (en) * | 2021-11-10 | 2022-02-25 | 中国航发南方工业有限公司 | Casting method for thin-wall casting and special-shaped section pipeline sand core |
| CN114082894B (en) * | 2021-11-10 | 2024-01-23 | 中国航发南方工业有限公司 | Casting method for thin-wall casting and special-shaped section pipeline sand core |
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Application publication date: 20150520 |