CN103433435B - Manufacturing process of overall titanium alloy impeller - Google Patents
Manufacturing process of overall titanium alloy impeller Download PDFInfo
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- CN103433435B CN103433435B CN201310350583.6A CN201310350583A CN103433435B CN 103433435 B CN103433435 B CN 103433435B CN 201310350583 A CN201310350583 A CN 201310350583A CN 103433435 B CN103433435 B CN 103433435B
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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 overall titanium alloy impeller.
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, containing CO, N in environmental gas
2
, NH
3
, CO
2
, SO
2
, SO
3
and Cl ion, general material, as conventional carbon steel and stainless steel can not meet the requirement of impeller working environment.Current state inner compressor industry selects dual phase steel SAF2205, high strength alloy steel FV520B and similar material as the material making impeller usually, also has the material selecting INCONEL625 alloy as impeller abroad.
except the requirement affected by working environment, impeller also needs to have very high intensity, could meet high pressure ratio, high-revolving duty.See the double shrouded wheel structure that accompanying drawing 1 is common, it comprises wheel cap 1 ', blade 2 ' and wheel disc 3 ', the foundry goods of wheel cap 1 ', blade 2 ' and wheel disc 3 ' is normally first obtained when impeller is produced, then the foundry goods of blade 2 ' and wheel disc 3 ' is placed in machining center Milling Process, thus obtain blade 2 ' and wheel disc 3 ', again wheel cap 1 ', blade 2 ' and wheel disc 3 ' is welded, obtain impeller overall; Accompanying drawing 2 is common half-opened impeller structure, and it comprises blade 2 ' and wheel disc 3 ', normally obtains integral wheel by the mode of NC milling.Adopt the impeller that above-mentioned technique obtains, its intensity is difficult to the requirement meeting high-pressure ratio, high linear speed impeller, and welding procedure is comparatively complicated, the impeller that particularly impeller outlet width is little especially needs to weld in vacuum brazing furnace, and the process-cycle of whole impeller is also longer.
Summary of the invention
the object of this invention is to provide a kind of manufacturing process of overall titanium alloy impeller, to obtain high strength, there is the impeller of good heat-resisting quantity and corrosion resistance, and improve the production efficiency of impeller.
for achieving the above object, the technical solution used in the present invention is: a kind of manufacturing process of overall 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, sets up the 3D model of described impeller by computer;
(2) obtain product model, adopt light-curing rapid forming equipment, according to the impeller pattern that the 3D model forming acquisition photosensitive resin material of described impeller is made;
(3) shell makes, and adopts acetic acid zirconium as adhesive, and adopts oxidation zircon sand to make ceramic slurry, is in the milk, and by shaping for its roasting, obtains pump vane casting shell to the described impeller pattern that step (2) obtains;
(4) cast, this casting cycle comprises the steps:
a. described pump vane casting shell is fixed in the furnace chamber of casting furnace, and the casting cylinder coaxial inner conductor of the sprue mouth of described pump vane casting shell and described casting furnace is arranged, make itself and described casting cylinder synchronous rotary simultaneously, fix the furnace chamber of casting furnace described in quick closure after described pump vane casting shell;
b. the furnace chamber of described casting furnace is vacuumized;
c. in the furnace chamber of described casting furnace, appropriate argon gas is filled with;
d. described casting cylinder and described pump vane casting shell coaxial rotation, rotating speed is 300 ~ 400r/min, after the solution melting 7 ~ 10min of titanium alloy in vacuum melting furnace, pour into a mould titanium alloy solution by described sprue mouth in the die cavity of described pump vane casting shell;
e. die sinking obtains impeller casting;
(5) cooling and heating treatment, first cools described impeller casting, then eliminates its stress through vacuum annealing;
(6) hip treatment, the described impeller casting after step (5) process is placed in high temperature insostatic pressing (HIP) stove and is forced into 100MPa ~ 110MPa, and temperature remains on 900 DEG C ~ 950 DEG C, heat-insulation pressure keeping more than 2 hours;
(7) depollute layer, adopts the method for sandblasting and pickling to remove the pollution layer on the described impeller casting surface after step (6) process, obtain overall titanium alloy impeller product.
preferably; described manufacturing process is further comprising the steps of: between described step (3) and described step (4); namely before casting described pump vane casting shell is placed in temperature and is 110 DEG C ~ 130 DEG C and the drying box vacuumized is preserved, and the described sprue mouth of described pump vane casting shell is protected.
preferably, in the step b in described step (4), the force value vacuumizing the furnace chamber of rear described casting furnace is 0.4Pa ~ 0.5Pa.
preferably, in described step (5), vacuum annealing condition is below vacuum 7Pa, and temperature is 750 DEG C ~ 800 DEG C, and is incubated 1 ~ 3 hour.
preferably, in described step (6), moulding pressure is 103MPa, and temperature remains on 920 DEG C, and heat-insulation pressure keeping time controling is little between 3 hours 2.
due to the utilization of 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 overall titanium alloy impeller of the present invention, it has good compression strength and yield strength, and good corrosion-resistant, resistance to elevated temperatures, meet centrifugal compressor and turbo-expander to the service behaviour requirement of impeller, product manufacturing is convenient and the manufacturing cycle is shorter, the product glossiness obtained is high and without the need to mechanical process, casting flaw is few, defect area is little, and casting flaw is eliminated convenient.In addition, under the prerequisite ensureing high linear speed, the diameter of impeller can be significantly less, for the integral miniaturization of centrifugal compressor and turbo-expander lays the foundation, meanwhile, 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, thus saves electric energy.
Accompanying drawing explanation
accompanying drawing 1 is the cross-sectional schematic of double shrouded wheel in background technology;
accompanying drawing 2 is the cross-sectional schematic of half-opened impeller in background technology;
accompanying drawing 3 is the flow chart of manufacturing process of the present invention.
Detailed description of the invention
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:
first according to the design parameter of impeller to be manufactured, the modeling software of computer such as solidworks sets up the 3D model of impeller; Then adopt light-curing rapid forming equipment, adopt photosensitive resin material as raw material, according to the impeller pattern that the 3D model forming acquisition photosensitive resin material of impeller is made, i.e. RP model; Adopt acetic acid zirconium as adhesive again, and adopt the oxidation zircon sand of different meshes to make ceramic slurry, the impeller pattern of above-mentioned acquisition is in the milk, and by shaping for its roasting, obtains pump vane casting shell.
if not immediately for casting after obtaining above-mentioned pump vane casting shell; then this pump vane casting shell is placed in temperature and is 110 DEG C ~ 130 DEG C and the drying box vacuumized is preserved; and the sprue mouth of pump vane casting shell is protected; prevent foreign material from entering in its die cavity, need to be taken out again during casting.
following then start casting process.First above-mentioned pump vane casting shell is fixed in the furnace chamber of casting furnace during casting, and the casting cylinder coaxial inner conductor of the sprue mouth of pump vane casting shell and casting furnace is arranged, make pump vane casting shell and casting cylinder synchronous rotary simultaneously, the bell of casting furnace is covered rapidly with the furnace chamber of closed casting furnace after fixing pump vane casting shell, then process is vacuumized to the furnace chamber of casting furnace, the vacuum vacuumized is about 0.4Pa, turn off vacuum valve, vacuum meter and vavuum pump after reaching vacuum level requirements, vacuumize end.After vacuumizing, volatilize in high temperature for preventing metal in casting cycle, and volatile quantity strengthens under rough vacuum, then in the furnace chamber of casting furnace, be filled with appropriate argon gas, suitably to increase the air pressure in casting furnace furnace chamber, reduce vacuum, suppress the volatilization of molten metal, when to be pressurized to Pressure gauge show value be 0.06MPa, stop being filled with argon gas.When after the solution melting 7 ~ 10min of titanium alloy in vacuum melting furnace, temperature reaches 1800 DEG C; drive casting cylinder and pump vane casting shell with the rotating speed coaxial rotation of 300 ~ 400r/min; wait that the liquid titanium alloy solution of casting in cylinder enters the die cavity of pump vane casting shell by sprue mouth; under the influence of centrifugal force; the crystal of titanium alloy melting liquid radially increases, and rear die sinking of having cast obtains impeller casting.
then carry out subsequent treatment to above-mentioned impeller casting, first to impeller casting cooling processing, then eliminate its stress through vacuum annealing process, vacuum annealing condition is below vacuum 7Pa, and temperature is 750 DEG C ~ 800 DEG C, and is incubated 1 ~ 3 hour.And then hip treatment is carried out to it, thus the tiny flaw on elimination impeller casting, during high temperature insostatic pressing (HIP), impeller casting after annealing in process is placed in high temperature insostatic pressing (HIP) stove and is forced into 103MPa, temperature remains on 920 DEG C, and heat-insulation pressure keeping 2 hours, finally adopt the method for sandblasting and pickling to remove the pollution layer on impeller casting surface again, Acidwash solution can adopt HF, HNO
3
, H
2
o(ratio is 3:3:2) mixed solution, pickling time 2 minutes.So just, required monoblock type titanium alloy impeller product can be obtained.
the performance of above-mentioned monoblock type titanium alloy impeller product is tested, its compression strength reaches 1100MPa, yield strength is 850MPa, far above the compression strength>=895MPa of national standard requirement, the requirement of yield strength>=825MPa, when this monoblock type titanium alloy impeller product rotates, the impeller that obtains compared to existing technology of its linear velocity has had and has significantly improved, and is applicable to high rotation speed operation.Under the prerequisite ensureing high linear speed, impeller diameter can also be reduced, for the miniaturization of compressor or air blast lays the foundation.
to sum up, adopt the monoblock type titanium alloy impeller product that the manufacturing process of overall titanium alloy impeller of the present invention obtains, it has good compression strength and yield strength, product manufacturing is convenient and the manufacturing cycle is shorter, the product glossiness obtained is high and without the need to 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 is 55% ~ 60% of other material impeller weight in prior art, and its rotary inertia significantly reduces, and can reduce the load of motor, saves electric energy about 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 for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and be implemented; 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 in protection scope of the present invention.
Claims (5)
1. a manufacturing process for overall 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, sets up the 3D model of described impeller by computer;
(2) obtain product model, adopt light-curing rapid forming equipment, according to the impeller pattern that the 3D model forming acquisition photosensitive resin material of described impeller is made;
(3) shell makes, and adopts acetic acid zirconium as adhesive, and adopts oxidation zircon sand to make ceramic slurry, is in the milk, and by shaping for its roasting, obtains pump vane casting shell to the described impeller pattern that step (2) obtains;
(4) cast, this casting cycle comprises the steps:
A. described pump vane casting shell is fixed in the furnace chamber of casting furnace, and the casting cylinder coaxial inner conductor of the sprue mouth of described pump vane casting shell and described casting furnace is arranged, make itself and described casting cylinder synchronous rotary simultaneously, fix the furnace chamber of casting furnace described in quick closure after described pump vane casting shell;
B. the furnace chamber of described casting furnace is vacuumized;
C. in the furnace chamber of described casting furnace, appropriate argon gas is filled with;
D. described casting cylinder and described pump vane casting shell coaxial rotation, rotating speed is 300 ~ 400r/min, after the solution melting 7 ~ 10min of titanium alloy in vacuum melting furnace, pour into a mould titanium alloy solution by described sprue mouth in the die cavity of described pump vane casting shell;
E. die sinking obtains impeller casting;
(5) cooling and heating treatment, first cools described impeller casting, then eliminates its stress through vacuum annealing;
(6) hip treatment, the described impeller casting after step (5) process is placed in high temperature insostatic pressing (HIP) stove and is forced into 100MPa ~ 110MPa, and temperature remains on 900 DEG C ~ 950 DEG C, heat-insulation pressure keeping more than 2 hours;
(7) depollute layer, adopts the method for sandblasting and pickling to remove the pollution layer on the described impeller casting surface after step (6) process, obtain overall titanium alloy impeller product.
2. the manufacturing process of a kind of overall 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); namely before casting described pump vane casting shell is placed in temperature and is 110 DEG C ~ 130 DEG C and the drying box vacuumized is preserved, and the described sprue mouth of described pump vane casting shell is protected.
3. the manufacturing process of a kind of overall titanium alloy impeller according to claim 1, is characterized in that: in the step b in described step (4), and the force value vacuumizing the furnace chamber of rear described casting furnace is 0.4Pa ~ 0.5Pa.
4. the manufacturing process of a kind of overall titanium alloy impeller according to claim 1, is characterized in that: in described step (5), and vacuum annealing condition is below vacuum 7Pa, and temperature is 750 DEG C ~ 800 DEG C, and is incubated 1 ~ 3 hour.
5. the manufacturing process of a kind of overall titanium alloy impeller according to claim 1, is characterized in that: in described step (6), and moulding pressure is 103MPa, and temperature remains on 920 DEG C, and heat-insulation pressure keeping time controling is little between 3 hours 2.
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| CN103433435B true CN103433435B (en) | 2015-05-13 |
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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. |