CN106735633B - A kind of double shrouded wheel electric discharge machining apparatus and processing method - Google Patents

A kind of double shrouded wheel electric discharge machining apparatus and processing method Download PDF

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Publication number
CN106735633B
CN106735633B CN201611208198.8A CN201611208198A CN106735633B CN 106735633 B CN106735633 B CN 106735633B CN 201611208198 A CN201611208198 A CN 201611208198A CN 106735633 B CN106735633 B CN 106735633B
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electrode
double shrouded
shrouded wheel
preprocessing
roughing
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CN106735633A (en
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李艳
伏金娟
杨立光
郭妍
于帆
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Beijing Electric Processing Research Institute Co.,Ltd.
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BEIJING ELECTRICAL PROCESSING INST
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23HWORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/10Working turbine blades or nozzles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The present invention relates to Impeller Machining technical field more particularly to a kind of double shrouded wheel electric discharge machining apparatus and processing methods.Double shrouded wheel electric discharge machining apparatus includes for installing the impeller installs fixture of double shrouded wheel to be processed, preprocessing electrode installs fixture and multiple preprocessing electrodes;Impeller installs fixture is equipped with installation axle, and double shrouded wheel to be processed is equipped with center positioning hole, and double shrouded wheel to be processed is arranged on the mounting shaft by center positioning hole;Electrode installs fixture includes first electrode mounting base, and multiple preprocessing electrodes are connect with first electrode mounting base, and multiple preprocessing electrodes circumferentially arrange, and the number of preprocessing electrode is identical as the runner number of double shrouded wheel to be processed;And each preprocessing electrode is corresponding with a flow channel entry point of double shrouded wheel to be processed when processing;Further include the first driving mechanism, moves along a straight line for driving electrodes installs fixture along Z axis, Z axis is the extending direction of installation axle.Processing efficiency is improved, ensure that machining accuracy.

Description

A kind of double shrouded wheel electric discharge machining apparatus and processing method
Technical field
The present invention relates to Impeller Machining technical field more particularly to a kind of double shrouded wheel electric discharge machining apparatus and processing sides Method.
Background technique
Double shrouded wheel obtains increasingly in the advanced turbomachinery that the fields such as aerospace engine, petrochemical industry use More applications.The structure of double shrouded wheel is extremely complex, processing accessibility is poor, in addition mostly using high temperature alloy or titanium alloy etc. are difficult to add Work material, traditional machining are difficult to realize the processing of degree of precision.Electrical discharge machining utilizes pulse feature between tool and workpiece Spark discharge carrys out the extra material of ablation, has many advantages, such as that precision is high, adaptability for materials is wide.Existing double shrouded wheel electrical spark working Work technology is processed by main tapping band moving electrode, and processing efficiency is low.Therefore, in existing sinking EDM condition Under, how processing efficiency and machining accuracy are improved, there is realistic meaning to the processing quality for improving double shrouded wheel.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is to solve each runner of double shrouded wheel in the prior art individually to process, processing effect The low problem of rate.
(2) technical solution
In order to solve the above-mentioned technical problems, the present invention provides a kind of double shrouded wheel electric discharge machining apparatus, including are used for The impeller installs fixture, preprocessing electrode installs fixture and multiple preprocessing electrodes of double shrouded wheel to be processed are installed;The impeller Installs fixture is equipped with installation axle, and the double shrouded wheel to be processed is equipped with center positioning hole, and the double shrouded wheel to be processed passes through The center positioning hole is arranged on the mounting shaft;The electrode installs fixture includes first electrode mounting base, multiple pre-add Work electrode is connect with the first electrode mounting base, and multiple preprocessing electrodes circumferentially arrange, the number of preprocessing electrode Mesh is identical as the runner number of double shrouded wheel to be processed;And each preprocessing electrode and the enclosed leaf to be processed when processing One flow channel entry point of wheel is corresponding;It further include the first driving mechanism, for driving the electrode installs fixture to transport along Z axis straight line Dynamic, the Z axis is the extending direction of the installation axle.
According to the present invention, each preprocessing electrode is provided with cooling passage.
According to the present invention, the cooling passage of the preprocessing electrode is equipped with an inlet and two liquid outlets, described Inlet is set to the side of the preprocessing electrode far from the center of circle, and two liquid outlets are respectively arranged on and are equipped with the inlet The adjacent two sides in side.
According to the present invention, the impeller installs fixture includes pedestal and the supporting table on the base top surface, institute The diameter for stating supporting table is less than the diameter of the pedestal;The installation axle is set to the one side that the supporting table deviates from the pedestal, One end that the double shrouded wheel to be processed is relatively large in diameter is equipped with boss, and when installation, the boss was connected to the supporting table away from institute State the one side of pedestal;The positioning plate being sheathed on the outside of the supporting table, the radial direction of the mounting plate are further fixed on the pedestal It is equipped with the threaded hole of multiple perforation mounting plates, is equipped with adjusting screw in the threaded hole, and close in the threaded hole One end of the boss of the double shrouded wheel to be processed is equipped with soft adjustment column, the outer edge phase of the adjustment column and the boss Contact.
According to the present invention, the adjustment column is made of metallic copper.
According to the present invention, the top of the installation axle is equipped with external screw thread, and the external thread sleeve is equipped with locking nut, for solid The fixed double shrouded wheel to be processed.
According to the present invention, the first electrode mounting base is disc, and being circumferentially with for the first electrode mounting base is more A mounting hole, the mounting hole are equipped with locating slot, the fixing end and the installation of the preprocessing electrode close to the side in the center of circle Hole matches, and the fixing end of the preprocessing electrode is equipped with locating piece, and the mounting hole is provided with top far from the side in the center of circle Silk, for fixing the preprocessing electrode and the first electrode mounting base.
It according to the present invention, further include entrance roughing electrode, outlet roughing electrode and the second driving mechanism, the electrode Installs fixture further includes second electrode mounting base, the entrance roughing electrode and outlet roughing electrode use when with it is described The connection of second electrode mounting base, the entrance roughing electrode and outlet roughing electrode form runner for roughing;It is described Second driving mechanism is transported for driving the double shrouded wheel to be processed to rotate around the installation axle, and along X-axis and Y-axis straight line It is dynamic;First driving mechanism is also used to that the electrode installs fixture is driven to rotate around B axle, and the B axle is parallel with X-axis.
According to the present invention, the entrance roughing electrode and the outlet roughing electrode are all made of detachable electrode.
A kind of double shrouded wheel electric discharge machining method provided by the invention, comprising the following steps:
S1, using preprocessing electrode preprocessing flow channel entry point;
S2 is connected to flow channel entry point with runner exit using outlet roughing electrode roughing runner exit;
S3, using entrance roughing electrode roughing flow channel entry point;
S4, semifinishing runner;
S5 finishes runner.
(3) beneficial effect
Above-mentioned technical proposal of the invention has the advantages that compared with prior art
(1) double shrouded wheel electric discharge machining apparatus provided in an embodiment of the present invention includes that can install multiple preprocessing electrodes Electrode installs fixture, multiple flow channel entry points of double shrouded wheel can obtain by multiple preprocessing electrode time processings, significantly Improve processing efficiency.
(2) embodiment of the present invention is after having carried out the roughing of flow channel entry point preprocessing and runner exit, the runner of impeller It is got through, coolant liquid can fill up rapidly runner, and cooling and the chip removal effect of coolant liquid are substantially improved.Then carry out flow channel entry point Roughing and runner entirety semifinishing and finishing, improve runner processing precision.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of double shrouded wheel electric discharge machining apparatus preprocessing state provided in an embodiment of the present invention;
Fig. 2 is the structural schematic diagram of the impeller installs fixture provided in an embodiment of the present invention for being equipped with double shrouded wheel;
Fig. 3 is the structural schematic diagram of first electrode mounting base in the present embodiment;
Fig. 4 is the structural schematic diagram of preprocessing electrode in the present embodiment;
Fig. 5 is that the structure of the double shrouded wheel electric discharge machining apparatus runner exit rough turn condition provided in the present embodiment is shown It is intended to;
Fig. 6 is that the structure of the double shrouded wheel electric discharge machining apparatus flow channel entry point rough turn condition provided in the present embodiment is shown It is intended to;
Fig. 7 is the structural schematic diagram of the present embodiment middle outlet roughing electrode;
Fig. 8 is the structural schematic diagram of entrance roughing electrode in the present embodiment;
Fig. 9 is the top view of double shrouded wheel after processing is completed in the present embodiment;
Figure 10 is sectional view along A-A in Fig. 9.
In figure: 1: double shrouded wheel;11: flow channel entry point;12: runner exit;13: boss;2: impeller installs fixture;21: peace Fill axis;22: pedestal;23: supporting table;24: positioning plate;25: adjusting screw;26: adjustment column;27: locking nut;3: electrode installation Fixture;31: first electrode mounting base;311: mounting hole;312: locating slot;313: jackscrew;4: preprocessing electrode;41: locating piece; 42: inlet;43: liquid outlet;5: second electrode mounting base;6: entrance roughing electrode;61: entrance roughing sub-electrode;7: Export roughing electrode;71: outlet roughing sub-electrode;8: connecting rod;9: turntable.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As Figure 1-Figure 4,1 electric discharge machining apparatus of double shrouded wheel provided in an embodiment of the present invention, including for installing Impeller installs fixture 2, preprocessing electrode installs fixture 3 and the multiple preprocessing electrodes 4 of double shrouded wheel 1 to be processed;Impeller installation Fixture 2 is equipped with installation axle 21, and double shrouded wheel 1 to be processed is equipped with center positioning hole, and double shrouded wheel to be processed 1 passes through centralized positioning Hole is set in installation axle 21;Electrode installs fixture 3 includes first electrode mounting base 31, and multiple preprocessing electrodes 4 are with first Electrode mounting base 31 connects, and multiple preprocessing electrodes 4 circumferentially arrange, the number of preprocessing electrode 4 and double shrouded wheel 1 to be processed Runner number it is identical;And each preprocessing electrode 4 is opposite with a flow channel entry point 11 of double shrouded wheel 1 to be processed when processing It answers;Further include the first driving mechanism, moves along a straight line for driving electrodes installs fixture 3 along Z axis, Z axis is the extension of installation axle 21 Direction.In use, multiple preprocessing electrodes 4 to be moved to the surface of double shrouded wheel 1 to be processed, driven by the first driving mechanism Electrode installs fixture 3 moves along a straight line downwards along Z axis, and multiple preprocessing electrodes 4 move separately down, removes 1 runner of double shrouded wheel Most of material at entrance 11, the inlet simultaneous processing of multiple runners, improves processing efficiency.
1 electric discharge machining apparatus of double shrouded wheel provided in an embodiment of the present invention includes that can install multiple preprocessing electrodes 4 Electrode installs fixture 3, multiple flow channel entry points 11 of double shrouded wheel 1 can obtain by multiple 4 time processings of preprocessing electrode, show It lands and improves processing efficiency.
Further, as shown in figure 4, each preprocessing electrode 4 is provided with cooling passage in the present embodiment.Specifically , the cooling passage of preprocessing electrode 4 is equipped with an inlet 42 in the present embodiment and two liquid outlets 43, inlet 42 are set In side of the preprocessing electrode 4 far from the center of circle, two liquid outlets 43 are respectively arranged on two adjacent with the side of inlet 42 is equipped with Side.Since in preprocessing, excision material is more, generation heat is larger, can be played preferably by the cooling passage of setting Cooling effect.
Further, as shown in Fig. 2, impeller installs fixture 2 includes pedestal 22 and pushes up set on pedestal 22 in the present embodiment Supporting table 23 on face, the diameter of supporting table 23 are less than the diameter of pedestal 22;Installation axle 21 is set to supporting table 23 and deviates from pedestal 22 One side, one end that double shrouded wheel 1 to be processed is relatively large in diameter is equipped with boss 13, and boss 13 is connected to supporting table 23 and deviates from when installation The one side of pedestal 22;Preferably, the top of installation axle 21 is equipped with external screw thread in the present embodiment, and external thread sleeve is equipped with locking nut 27, for fixing double shrouded wheel 1 to be processed, the positioning in 1 vertical direction of double shrouded wheel is total to by locking nut 27 and supporting table 23 With completion.The positioning plate 24 for being sheathed on 23 outside of supporting table is further fixed on pedestal 22, mounting plate is radially equipped with multiple pass through The threaded hole of logical mounting plate, threaded hole is interior to be equipped with adjusting screw 25, and close to the boss 13 of double shrouded wheel 1 to be processed in threaded hole One end be equipped with soft adjustment column 26, adjustment column 26 is in contact with the outer edge of boss 13.Preferably, multiple in the present embodiment Circumferential array arrangement of the threaded hole along installation.Further, in this embodiment adjustment column 26 is made of metallic copper.Adjustment column 26 It is also possible to the soft material composition such as nylon plastic(s), passes through the adjusting screw 25 and the adjustable enclosed leaf of adjustment column 26 of setting The concentricity of wheel 1 and installation axle 21, ensure that concentricity between the two, also, soft adjustment column 26 will not be to impeller Surface causes to damage, and ensure that the complete of 1 outer surface of double shrouded wheel.
Further, as shown in figure 3, first electrode mounting base 31 is disc, first electrode mounting base in the present embodiment 31 are circumferentially with multiple mounting holes 311, and mounting hole 311 is equipped with locating slot 312 close to the side in the center of circle, preprocessing electrode 4 Fixing end is matched with mounting hole 311, and the fixing end of preprocessing electrode 4 is equipped with locating piece 41, and mounting hole 311 is far from the center of circle Side is provided with jackscrew 313, for fixing preprocessing electrode 4 and first electrode mounting base 31.Pacified by setting in first electrode 31 locating slot 312 of dress seat and the locating piece 41 that 4 fixing end of preprocessing electrode is arranged in realize the accurate fixed of preprocessing electrode 4 Position, ensure that the precision of processing.
It further, as shown in Figure 5-Figure 8, further include entrance roughing electrode 6, outlet roughing electrode in the present embodiment 7 and second driving mechanism, electrode installs fixture 3 further includes second electrode mounting base 5, entrance roughing electrode 6 and outlet it is thick plus Work electrode 7 is using the connection of Shi Junyu second electrode mounting base 5, entrance roughing electrode 6 and outlet roughing electrode 7 for slightly adding Work forms runner;Second driving mechanism is used to that double shrouded wheel 1 to be processed to be driven to rotate around installation axle 21, and straight along X-axis and Y-axis Line movement;First driving mechanism is also used to driving electrodes installs fixture 3 and rotates around B axle, and B axle is parallel with X-axis, i.e. hangs down in Fig. 5 It is directly the extending direction of B axle in the direction of paper.Electrode installs fixture 3 as shown in Figure 5 further includes connecting rod 8 and turntable 9, is turned The rotation of disk 9 drives connecting rod 8 to rotate around B axle.Entrance roughing electrode 6, the outlet roughing electrode 7 of setting are respectively used to flow The roughing of flow channel entry point 11 roughing and runner exit 12 after the completion of 11 preprocessing of road entrance, preliminarily forms each runner. It is preferential in process first to get through runner using outlet 7 export processing of roughing electrode, then slightly added using entrance again Work electrode 6 process inlet preprocessing electrode 4 the undressed some materials arrived.
Preferably, the entrance roughing electrode 6 in the present embodiment and outlet roughing electrode 7 are all made of detachable electrode. Entrance roughing electrode 6 is made of two entrances roughing sub-electrode 61, and outlet roughing electrode 7 is by two outlet roughing point Electrode 71 forms.The programming difficulty in process can be reduced using detachable electrode.Specifically, first in the present embodiment Driving mechanism and the second driving can be realized using existing spark erosion equipment.Specifically, the present embodiment is additionally provided with stream Road semifinishing electrode and runner finish electrode, semifinishing and finishing after being respectively used to roughing.Wherein, runner half Finishing electrode considers that the influence of discharging gap is thickened on the basis of roughing electrode, thicken with a thickness of 0.5mm, flow Road finishing electrode on the basis of runner semifinishing electrode and considers that the influence of discharging gap thickens again, the thickness thickened For 0.2mm.The embodiment of the present invention is after having carried out 11 preprocessing of flow channel entry point and the roughing of runner exit 12, the runner of impeller It is got through, coolant liquid can fill up rapidly runner, and cooling and the chip removal effect of coolant liquid are substantially improved.Then carry out flow channel entry point 11 roughing and the semifinishing and finishing of runner entirety improve runner processing precision.Enclosed leaf after processing is completed Wheel construction is as shown in Figure 9 and Figure 10.
The embodiment of the invention also provides a kind of double shrouded wheel electric discharge machining methods, comprising the following steps:
S1, using 4 preprocessing flow channel entry point 11 of preprocessing electrode;
S2 is connected to flow channel entry point 11 with runner exit 12 using outlet 7 roughing runner exit 12 of roughing electrode;
S3, using 6 roughing flow channel entry point 11 of entrance roughing electrode;
S4, semifinishing runner;
S5 finishes runner.
Specifically, the specific processing conditions of runner preprocessing, roughing, semifinishing and finishing is as follows in the present embodiment Shown in table:
The embodiment of the present invention is after having carried out 11 preprocessing of flow channel entry point and the roughing of runner exit 12, the runner of impeller It is got through, coolant liquid can fill up rapidly runner, and cooling and the chip removal effect of coolant liquid are substantially improved.Then carry out flow channel entry point 11 roughing and the semifinishing and finishing of runner entirety improve runner processing precision.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features; And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (9)

1. a kind of double shrouded wheel electric discharge machining apparatus, it is characterised in that: including the impeller for installing double shrouded wheel to be processed Installs fixture, electrode installs fixture and multiple preprocessing electrodes;
The impeller installs fixture is equipped with installation axle, and the double shrouded wheel to be processed is equipped with center positioning hole, and described to be processed Double shrouded wheel is arranged on the mounting shaft by the center positioning hole;
The electrode installs fixture includes first electrode mounting base, and multiple preprocessing electrodes are installed with the first electrode Seat connection, multiple preprocessing electrodes circumferentially arrange, the runner number of the number of preprocessing electrode and double shrouded wheel to be processed Mesh is identical;And each preprocessing electrode is corresponding with a flow channel entry point of the double shrouded wheel to be processed when processing;
It further include the first driving mechanism, for driving the electrode installs fixture to move along a straight line along Z axis, the Z axis is the peace Fill the extending direction of axis;First driving mechanism is also used to that the electrode installs fixture is driven to rotate around B axle, the B axle and X Axis is parallel;
It further include that entrance roughing electrode, outlet roughing electrode and the second driving mechanism, the electrode installs fixture further include Second electrode mounting base, the entrance roughing electrode and outlet roughing electrode use when with the second electrode mounting base Connection, the entrance roughing electrode and outlet roughing electrode form runner for roughing;
Second driving mechanism is used to that the double shrouded wheel to be processed to be driven to rotate around the installation axle, and along X-axis and Y-axis Linear motion.
2. double shrouded wheel electric discharge machining apparatus according to claim 1, it is characterised in that: each preprocessing Electrode is provided with cooling passage.
3. double shrouded wheel electric discharge machining apparatus according to claim 2, it is characterised in that: the preprocessing electrode it is cold But liquid channel is equipped with an inlet and two liquid outlets, and the inlet is set to one of the preprocessing electrode far from the center of circle Side, two liquid outlets are respectively arranged on the two sides adjacent with the side of the inlet is equipped with.
4. double shrouded wheel electric discharge machining apparatus according to claim 1, it is characterised in that: the impeller installs fixture packet Pedestal and the supporting table on the base top surface are included, the diameter of the supporting table is less than the diameter of the pedestal;
The installation axle be set to the supporting table deviate from the pedestal one side, the double shrouded wheel to be processed be relatively large in diameter one End is equipped with boss, and when installation, the boss was connected to the one side that the supporting table deviates from the pedestal;
The positioning plate being sheathed on the outside of the supporting table is further fixed on the pedestal, being radially equipped with for the positioning plate is multiple The threaded hole of the positioning plate is penetrated through, is equipped with adjusting screw in the threaded hole, and close to described to be processed in the threaded hole One end of the boss of double shrouded wheel is equipped with soft adjustment column, and the adjustment column is in contact with the outer edge of the boss.
5. double shrouded wheel electric discharge machining apparatus according to claim 4, it is characterised in that: the adjustment column uses metal Copper at.
6. double shrouded wheel electric discharge machining apparatus according to claim 4, it is characterised in that: set at the top of the installation axle There is external screw thread, the external thread sleeve is equipped with locking nut, for fixing the double shrouded wheel to be processed.
7. double shrouded wheel electric discharge machining apparatus according to claim 1, it is characterised in that: the first electrode mounting base For disc, the first electrode mounting base is circumferentially with multiple mounting holes, and the mounting hole is equipped with close to the side in the center of circle The fixing end of locating slot, the preprocessing electrode is matched with the mounting hole, and the fixing end of the preprocessing electrode is equipped with Locating piece, the mounting hole are provided with jackscrew far from the side in the center of circle, for fixing the preprocessing electrode and first electricity Pole mounting base.
8. double shrouded wheel electric discharge machining apparatus according to claim 1, it is characterised in that: the entrance roughing electrode Detachable electrode is all made of with the outlet roughing electrode.
9. a kind of double shrouded wheel electric discharge machining method based on double shrouded wheel electric discharge machining apparatus described in claim 1, Characterized by comprising the following steps:
S1, using preprocessing electrode preprocessing flow channel entry point;
S2 is connected to flow channel entry point with runner exit using outlet roughing electrode roughing runner exit;
S3, using entrance roughing electrode roughing flow channel entry point;
S4, semifinishing runner;
S5 finishes runner.
CN201611208198.8A 2016-12-23 2016-12-23 A kind of double shrouded wheel electric discharge machining apparatus and processing method Active CN106735633B (en)

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CN111906360A (en) * 2020-08-11 2020-11-10 西安交通大学深圳研究院 Nickel-based superalloy closed impeller rough machining method
CN114700566B (en) * 2022-06-07 2022-08-19 成都宝利根创科电子有限公司 Working method for machining integral ox horn gate insert and pre-penetrating tool electrode thereof

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EP2177298A1 (en) * 2008-10-20 2010-04-21 Sulzer Markets and Technology AG Manufacturing procedure for closed discs
CN101508047B (en) * 2009-03-11 2010-07-21 南京航空航天大学 Multi-electrode spiral feeding integral blade wheel inter-blade passage electrolytic machining method
CN101524805B (en) * 2009-04-10 2011-03-16 南京航空航天大学 Method for manufacturing three-dimensional flow enclosed-type impeller inter-impeller passage and special clamp thereof
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CN103240473B (en) * 2012-02-07 2015-08-19 通用电气公司 Electrode and manufacture method thereof
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