CN103433435A - Manufacturing process of overall titanium alloy impeller - Google Patents
Manufacturing process of overall titanium alloy impeller Download PDFInfo
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- CN103433435A CN103433435A CN2013103505836A CN201310350583A CN103433435A CN 103433435 A CN103433435 A CN 103433435A CN 2013103505836 A CN2013103505836 A CN 2013103505836A CN 201310350583 A CN201310350583 A CN 201310350583A CN 103433435 A CN103433435 A CN 103433435A
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Abstract
The invention discloses a manufacturing process of an overall titanium alloy impeller. The overall titanium alloy impeller obtained by adopting the manufacturing process has better anti-pressure strength and yield strength, as well as good abrasion resistance and high temperature resistance, meets the requirements of a centrifugal compressor and a turbo-expander for working performance, and is convenient to manufacture, shorter in manufacture period, high in product fineness, less in casting defect, small in defect area, and convenient in overcoming of the casting defect, and does not require mechanical processing treatment. Moreover, under the premise of ensuring the high line speed, the diameter of the impeller can be reduced to a great extent, so that a basis is established for overall miniaturization of the centrifugal compressor and the turbo-expander; in addition, the overall titanium alloy impeller obtained by adopting the manufacturing process is lighter in weight, is greatly reduced in rotation inertia, and can reduce the load of an electric motor, thereby saving electric energy.
Description
Technical field
the present invention relates to a kind of manufacturing process of whole titanium alloy impeller.
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Background technology
along with the fast development of national economy, the application of centrifugal compressor and turbo-expander is more and more extensive, especially at metallurgy, oil, chemical industry, sewage disposal and Salt Industry, also more and more higher to the requirement of compressor and decompressor.Impeller is the core component of centrifugal compressor and turbo-expander, and the working media of impeller is generally high temperature, severe corrosive gas, contains CO, N in environmental gas
2
, NH
3
, CO
2
, SO
2
, SO
3
and the Cl ion, general material, as carbon steel commonly used and stainless steel can not meet the requirement of impeller working environment.State's inner compressor industry selects dual phase steel SAF2205, high strength alloy steel FV520B and similar material as the material of making impeller usually at present, abroad also has and selects the material of INCONEL625 alloy as impeller.
except the requirement that affected by working environment, impeller also needs to have very high intensity, could meet high pressure ratio, high-revolving duty.Referring to accompanying drawing 1, it is common double shrouded wheel structure, it comprises wheel cap 1 ', blade 2 ' and wheel disc 3 ', impeller normally first obtains the foundry goods of wheel cap 1 ', blade 2 ' and wheel disc 3 ' while producing, then the foundry goods of blade 2 ' and wheel disc 3 ' is placed in to the machining center Milling Process, thereby obtain blade 2 ' and wheel disc 3 ', again wheel cap 1 ', blade 2 ' and wheel disc 3 ' are welded, obtained impeller integral body; Accompanying drawing 2 is common half-opened impeller structure, and it comprises blade 2 ' and wheel disc 3 ', and the mode of normally processing by numerical control milling is obtained integral wheel.The impeller that adopts above-mentioned technique to obtain, its intensity is difficult to meet the requirement of high-pressure ratio, high linear speed impeller, and welding procedure is comparatively complicated, the impeller that particularly impeller outlet width is especially little need to be welded in vacuum brazing furnace, and the process-cycle of whole impeller is also longer.
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Summary of the invention
the manufacturing process that the purpose of this invention is to provide a kind of whole titanium alloy impeller, with the impeller that obtains high strength, there is good heat-resisting quantity and corrosion resistance, and the production efficiency of raising impeller.
for achieving the above object, the technical solution used in the present invention is: a kind of manufacturing process of whole titanium alloy impeller, for obtaining monoblock type titanium alloy impeller, comprises the steps:
(1) microcomputer modelling, according to the design parameter of impeller to be manufactured, set up the 3D model of described impeller by computer;
(2) obtain product model, adopt light-curing rapid forming equipment, according to the 3D model forming of described impeller, obtain the impeller pattern that photosensitive resin material is made;
(3) shell is made, and adopts the acetic acid zirconium as adhesive, and adopts oxidation zircon sand to make ceramic slurry, and the described impeller pattern that step (2) is obtained is in the milk, and, by its roasting moulding, obtains impeller casting shell;
(4) casting, this casting cycle comprises the steps:
a. described impeller casting is fixed in the furnace chamber of casting furnace with shell, and make described impeller cast with the sprue mouth of shell and the casting cylinder coaxial inner conductor setting of described casting furnace, make itself and described casting cylinder synchronous rotary simultaneously, fix for described impeller casting after shell the furnace chamber of the described casting furnace of sealing fast;
b. the furnace chamber of described casting furnace is vacuumized;
c. be filled with appropriate argon gas in the furnace chamber of described casting furnace;
d. described casting cylinder and described impeller are cast and are used the shell coaxial rotation, rotating speed is 300～400r/min, after titanium alloy solution fusing 7～10min in vacuum melting furnace, by described sprue mouth, to described impeller casting, uses in the die cavity of shell and pours into a mould titanium alloy solution;
e. impeller casting is obtained in die sinking;
(5) cooling and heat treatment, first carry out coolingly to described impeller casting, then eliminate its stress through vacuum annealing;
(6) hip treatment, be placed in the described impeller casting after step (5) is processed the high temperature insostatic pressing (HIP) stove and be forced into 100MPa～110MPa, and temperature remains on 900 ℃～950 ℃, and heat-insulation pressure keeping is more than 2 hours;
(7) layer that depollutes, adopt the method for sandblast and pickling to remove the pollution layer on the described impeller casting surface after step (6) is processed, and obtains whole titanium alloy impeller product.
preferably; described manufacturing process is further comprising the steps of: between described step (3) and described step (4); before the casting, the casting of described impeller being placed in to temperature with shell is that 110 ℃～130 ℃ and the drying box that vacuumizes are preserved, and described impeller casting is protected with the described sprue mouth of shell.
preferably, in the step b in described step (4), the force value that vacuumizes the furnace chamber of rear described casting furnace is 0.4Pa～0.5 Pa.
preferably, in described step (5), the vacuum annealing condition is below vacuum 7Pa, and temperature is 750 ℃～800 ℃, and is incubated 1～3 hour.
preferably, in described step (6), moulding pressure is 103 M Pa, and temperature remains on 920 ℃, and the heat-insulation pressure keeping time is controlled between 2 hours to 3 hours.
utilization due to technique scheme, the present invention compared with prior art has following advantages: the monoblock type titanium alloy impeller product obtained by the manufacturing process of whole titanium alloy impeller of the present invention, it has compression strength and yield strength preferably, and good corrosion-resistant, resistance to elevated temperatures, meet the service behaviour requirement to impeller of centrifugal compressor and turbo-expander, product is easily manufactured and the manufacturing cycle is shorter, the product glossiness of obtaining is high and without mechanical process, casting flaw is few, defect area is little, and casting flaw is eliminated convenient.In addition, under the prerequisite that guarantees high linear speed, the diameter of impeller can be significantly less, for the integral miniaturization of centrifugal compressor and turbo-expander lays the foundation, simultaneously, the monoblock type titanium alloy impeller product obtained by manufacturing process of the present invention, its weight is less, rotary inertia significantly reduces, and can reduce the load of motor, thereby saves electric energy.
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The accompanying drawing explanation
the cross-sectional schematic that accompanying drawing 1 is double shrouded wheel in background technology;
the cross-sectional schematic that accompanying drawing 2 is half-opened impeller in background technology;
the flow chart that accompanying drawing 3 is manufacturing process of the present invention.
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The specific embodiment
below in conjunction with accompanying drawing and preferred embodiment of the present invention, technical scheme of the present invention is further elaborated.
shown in accompanying drawing 1, impeller manufacture of the present invention is carried out successively in accordance with the following steps:
at first according to the design parameter of impeller to be manufactured, the modeling software of computer is set up the 3D model of impeller as solidworks; Then adopt light-curing rapid forming equipment, adopt photosensitive resin material as raw material, obtain according to the 3D model forming of impeller the impeller pattern that photosensitive resin material is made, i.e. the RP model; Adopt the acetic acid zirconium as adhesive again, and adopt the oxidation zircon sand of different meshes to make ceramic slurry, the impeller pattern that step (2) is obtained is in the milk, and, by its roasting moulding, obtains impeller casting shell.
if obtain the casting of above-mentioned impeller with after shell not immediately for casting; the casting of this impeller being placed in to temperature with shell is that 110 ℃～130 ℃ and the drying box that vacuumizes are preserved; and casting is protected with the sprue mouth of shell to impeller; prevent that foreign material from entering in its die cavity, while needing casting again by its taking-up.
next starting casting processes.During casting, at first above-mentioned impeller casting is fixed in the furnace chamber of casting furnace with shell, and make impeller cast with the sprue mouth of shell and the casting cylinder coaxial inner conductor setting of casting furnace, make shell and casting cylinder synchronous rotary for the impeller casting simultaneously, fix impeller and cast the furnace chamber with the sealing casting furnace with the bell that covers rapidly casting furnace after shell, then the furnace chamber of casting furnace vacuumized to processing, the vacuum vacuumized is the 0.4Pa left and right, reach after vacuum requires and turn off vacuum valve, vacuum meter and vavuum pump, vacuumize end.After vacuumizing, for preventing that in casting cycle, metal volatilizees in high temperature, and volatile quantity strengthens under rough vacuum, in the furnace chamber of casting furnace, be filled with appropriate argon gas, suitably to increase the air pressure in the casting furnace furnace chamber, reduce vacuum, suppress the volatilization of molten metal, when being pressurized to the Pressure gauge show value and being 0.06MPa, stop being filled with argon gas.When after titanium alloy solution fusing 7～10min in vacuum melting furnace, temperature reaches 1800 ℃; drive casting cylinder and the impeller casting rotating speed coaxial rotation of shell with 300～400r/min; liquid titanium alloy solution in cylinder to be cast enters the die cavity of impeller casting with shell by the sprue mouth; under the effect of centrifugal force; the crystal of titanium alloy melting liquid radially increases, and the rear die sinking of having cast obtains impeller casting.
then above-mentioned impeller casting is carried out to subsequent treatment, first to the impeller casting cooling processing, then process and eliminate its stress through vacuum annealing, the vacuum annealing condition is below vacuum 7Pa, and temperature is 750 ℃～800 ℃, and is incubated 1～3 hour.And then it is carried out to hip treatment, thereby the tiny flaw on the elimination impeller casting, during high temperature insostatic pressing (HIP), impeller casting after annealing in process is placed in to the high temperature insostatic pressing (HIP) stove and is forced into 103M Pa, temperature remains on 920 ℃, and heat-insulation pressure keeping 2 hours, finally adopt again the method for sandblast and pickling to remove the pollution layer on impeller casting surface, Acidwash solution can adopt HF, HNO
3
, H
2
the O(ratio is 3:3:2) mixed solution, pickling time 2 minutes.So just, can obtain required monoblock type titanium alloy impeller product.
performance to above-mentioned monoblock type titanium alloy impeller product is tested, its compression strength reaches 1100MPa, yield strength is 850MPa, compression strength>=the 895MPa required far above national standard, the requirement of yield strength>=825MPa, the impeller that when this monoblock type titanium alloy impeller product rotates, its linear velocity obtains has compared to existing technology had significantly raising, is applicable to high rotation speed operation.Guaranteeing can also to reduce impeller diameter under the prerequisite of high linear speed, for the miniaturization of compressor or air blast lays the foundation.
to sum up, the monoblock type titanium alloy impeller product that adopts the manufacturing process of whole titanium alloy impeller of the present invention to obtain, it has good compression strength and yield strength, product is easily manufactured and the manufacturing cycle is shorter, the product glossiness of obtaining is high and without mechanical process, casting flaw is few, defect area is little, and casting flaw is eliminated convenient.This impeller can be fabricated to reduced size, and linear velocity is high, is applicable to high-revolving running.Under same size, the weight of this impeller be in prior art other material impeller weight 55%～60%, its rotary inertia significantly reduces, and can reduce the load of motor, saves electric energy approximately 30%.In addition, due to corrosion-resistant, the resistance to elevated temperatures of titanium alloy material, this monoblock type titanium alloy impeller product has higher service life.
?
above-described embodiment is only explanation technical conceive of the present invention and characteristics; its purpose is to allow the person skilled in the art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (5)
1. the manufacturing process of a whole titanium alloy impeller, for obtaining monoblock type titanium alloy impeller, is characterized in that: comprise the steps:
(1) microcomputer modelling, according to the design parameter of impeller to be manufactured, set up the 3D model of described impeller by computer;
(2) obtain product model, adopt light-curing rapid forming equipment, according to the 3D model forming of described impeller, obtain the impeller pattern that photosensitive resin material is made;
(3) shell is made, and adopts the acetic acid zirconium as adhesive, and adopts oxidation zircon sand to make ceramic slurry, and the described impeller pattern that step (2) is obtained is in the milk, and, by its roasting moulding, obtains impeller casting shell;
(4) casting, this casting cycle comprises the steps:
A. described impeller casting is fixed in the furnace chamber of casting furnace with shell, and make described impeller cast with the sprue mouth of shell and the casting cylinder coaxial inner conductor setting of described casting furnace, make itself and described casting cylinder synchronous rotary simultaneously, fix for described impeller casting after shell the furnace chamber of the described casting furnace of sealing fast;
B. the furnace chamber of described casting furnace is vacuumized;
C. be filled with appropriate argon gas in the furnace chamber of described casting furnace;
D. described casting cylinder and described impeller are cast and are used the shell coaxial rotation, rotating speed is 300～400r/min, after titanium alloy solution fusing 7～10min in vacuum melting furnace, by described sprue mouth, to described impeller casting, uses in the die cavity of shell and pours into a mould titanium alloy solution;
E. impeller casting is obtained in die sinking;
(5) cooling and heat treatment, first carry out coolingly to described impeller casting, then eliminate its stress through vacuum annealing;
(6) hip treatment, be placed in the described impeller casting after step (5) is processed the high temperature insostatic pressing (HIP) stove and be forced into 100MPa～110MPa, and temperature remains on 900 ℃～950 ℃, and heat-insulation pressure keeping is more than 2 hours;
(7) layer that depollutes, adopt the method for sandblast and pickling to remove the pollution layer on the described impeller casting surface after step (6) is processed, and obtains whole titanium alloy impeller product.
2. the manufacturing process of a kind of whole titanium alloy impeller according to claim 1; it is characterized in that: described manufacturing process is further comprising the steps of: between described step (3) and described step (4); before the casting, the casting of described impeller being placed in to temperature with shell is that 110 ℃～130 ℃ and the drying box that vacuumizes are preserved, and described impeller casting is protected with the described sprue mouth of shell.
3. the manufacturing process of a kind of whole titanium alloy impeller according to claim 1, it is characterized in that: in the step b in described step (4), the force value that vacuumizes the furnace chamber of rear described casting furnace is 0.4Pa～0.5 Pa.
4. the manufacturing process of a kind of whole titanium alloy impeller according to claim 1, it is characterized in that: in described step (5), the vacuum annealing condition is below vacuum 7Pa, temperature is 750 ℃～800 ℃, and is incubated 1～3 hour.
5. the manufacturing process of a kind of whole titanium alloy impeller according to claim 1, it is characterized in that: in described step (6), moulding pressure is 103 M Pa, and temperature remains on 920 ℃, and the heat-insulation pressure keeping time is controlled between 2 hours to 3 hours.
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Cited By (10)
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| CN104384447A (en) * | 2014-12-03 | 2015-03-04 | 中国船舶重工集团公司第十二研究所 | Method for manufacturing marine copper alloy highly-skewed paddles |
| CN105545566A (en) * | 2015-12-27 | 2016-05-04 | 张磊 | Waste water generation device |
| WO2016113552A1 (en) * | 2015-01-16 | 2016-07-21 | Cummins Ltd | A method for manufacturing a turbine wheel |
| CN106984819A (en) * | 2017-03-02 | 2017-07-28 | 东莞市依诺电子科技有限公司 | A kind of Ti6Al4V injection molding feedstocks 3D printing increasing material manufacturing method |
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| CN110614347A (en) * | 2019-11-06 | 2019-12-27 | 晋江渠成机械有限公司 | Investment casting process of fan-shaped impeller |
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| CN104384447B (en) * | 2014-12-03 | 2016-10-05 | 中国船舶重工集团公司第十二研究所 | A kind of method manufacturing marine copper alloy highly skewed propellers leaf |
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| GB2548776B (en) * | 2015-01-16 | 2021-05-26 | Cummins Ltd | A method for manufacturing a turbine wheel |
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| CN107350755A (en) * | 2016-12-27 | 2017-11-17 | 张浩为 | A kind of flowmeter acieral rotary blade rapid shaping and Surface hardened layer corrosion resistant technique |
| CN107350755B (en) * | 2016-12-27 | 2019-08-16 | 浙江裕顺仪表有限公司 | A kind of flowmeter acieral rotary blade rapid shaping and Surface hardened layer corrosion resistant technique |
| CN106984819A (en) * | 2017-03-02 | 2017-07-28 | 东莞市依诺电子科技有限公司 | A kind of Ti6Al4V injection molding feedstocks 3D printing increasing material manufacturing method |
| CN108856655A (en) * | 2018-06-29 | 2018-11-23 | 无锡范尼韦尔工程有限公司 | A kind of preparation process of the high-intensitive mixed flow charging turbine of sports racing car |
| CN110340286A (en) * | 2019-07-16 | 2019-10-18 | 中国航发北京航空材料研究院 | A kind of preparation method of high surface finish titanium investment precision casting |
| CN110560663A (en) * | 2019-08-21 | 2019-12-13 | 徐州东坤耐磨材料有限公司 | casting processing technology of water pump impeller |
| CN110523928A (en) * | 2019-08-22 | 2019-12-03 | 徐州东坤耐磨材料有限公司 | A kind of processing technology of diving pump blower inlet casing |
| CN110614347A (en) * | 2019-11-06 | 2019-12-27 | 晋江渠成机械有限公司 | Investment casting process of fan-shaped impeller |
| CN110614347B (en) * | 2019-11-06 | 2020-11-20 | 晋江渠成机械有限公司 | Investment casting process of fan-shaped impeller |
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Effective date of registration: 20180102 Address after: 215400 Jiangsu Province, Suzhou economic and Technological Development Zone Taicang City Temple Road No. 18 Patentee after: Suzhou Euler Turbine Machinery Co., Ltd. Address before: 215127 Suzhou City, Suzhou, Jiangsu, Luzhi Town, Ming City Road, No. 16 (Science and Technology Park) Patentee before: Suzhou Oula Engineering Technology Co., Ltd. |