CN102873416B - Electrode and machining method for electrolytic grooving of blisks - Google Patents

Electrode and machining method for electrolytic grooving of blisks Download PDF

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Publication number
CN102873416B
CN102873416B CN201210367002.5A CN201210367002A CN102873416B CN 102873416 B CN102873416 B CN 102873416B CN 201210367002 A CN201210367002 A CN 201210367002A CN 102873416 B CN102873416 B CN 102873416B
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electrode
electrolyte
finger tip
processing
blisk
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CN102873416A (en
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王德新
朱海南
于冰
盛文娟
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AECC Shenyang Liming Aero Engine Co Ltd
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Shenyang Liming Aero Engine Group Co Ltd
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Abstract

An electrode for electrolytic grooving of blisks is integrally of a hollow finger-shaped structure. An electrolyte channel is arranged inside the electrode, narrow grooves (1) with the widths of 0.6mm are circumferentially arranged at intervals of 1mm and are positioned at locations distanced from the upper edge of an outer profile close to a finger end of the electrode by 1/3-1/2, an electrolyte delivery pipeline (2) is disposed inside the electrode, a plugging structure (3) is arranged at the finger end so that the electrolyte delivery pipeline (2) is of a blind hole structure, and electrolyte only can flow out from the narrow grooves (1). A machining method for electrolytic grooving of the blisks includes that the electrode for electrolytic grooving of the blisks is used as a special tool, and an anode of a workpiece is dissolved in the electrolyte under the action of an electric field, so that the purpose of performing dimension machining for the workpiece is achieved; and the pressure of the electrolyte ranges from 4MPa to 6MPa, and the allowance reserved on a profile of a blisk body is 3.5mm. The electrode and the machining method have the advantages that the allowance reserved during electrolytic machining is uniform, high precision of repetition can be realized easily, a good flow field is obtained during electrolytic machining, and machining efficiency is high.

Description

Blisk electrolysis fluting electrode and blisk electrolysis fluting processing method
Technical field
The present invention relates to mechanical structured member technical field of electrolysis processing, specifically provide a kind of blisk electrolysis fluting electrode.
Background technology
In the forth generation aero-engine newly developed, for improving the thrust-weight ratio of engine, have employed a kind of new structure---blisk.Blisk requirement on machining accuracy is high, and difficulty of processing is large.Employing Electrolyzed Processing blisk is the processing method of high-efficiency high-quality low cost, and the Electrolyzed Processing of blisk is divided into fluting processing (or being called runner processing) and the processing of blade profile.Requirement for the processing of electrolysis fluting is: working (machining) efficiency wants high, and the surplus stayed to blade profile electrolysis Precision Machining is wanted evenly, to make blade profile finishing step reach drawing requirement.For this reason, the electrolysis fluting processing of blisk, on the basis of raising the efficiency, meet the requirement of lower operation processing, namely surplus is wanted evenly.
At present, the electrolysis fluting processing of blisk adopts the method for overlaying processing to carry out, overlaying processing adopts the electrode being similar to leaf cross-section shape, this shape is the minimum envelop face of the profile in all cross sections of envelope blade, when adopting overlaying processing, electrode is while making straight-line feed, electrode also will rotate according to the windup-degree of blade, by the runner processing of blade out, the shortcoming of the method is the blade profile shape of processing is identical, in fact each cross section of blade is different, the allowance stayed to the fine finishining of subsequent handling blade profile is uneven, this is very disadvantageous to blade profile processing below, cannot realize processing without surplus precision ECM.
People urgently wish to obtain the excellent blisk electrolysis fluting electrode of a kind of technique effect.
Summary of the invention
The object of this invention is to provide the blisk electrolysis fluting electrode that a kind of technique effect is excellent.High in order to meet electrolysis fluting working (machining) efficiency, process the uniform requirement of surplus stayed to blade profile after fluting processing, make blade profile finishing step reach drawing requirement.A kind of new processing method and new electrode structure is adopted in the electrolysis fluting processing of leaf dish, solve working (machining) efficiency low, ensure that the allowance stayed is even, surplus uniformity coefficient≤3.5mm, meet the requirement of rear operation processing, ensure that the machining accuracy of part.
The invention provides a kind of blisk electrolysis fluting electrode, it is characterized in that: described blisk electrolysis fluting electrode integral is hollow finger, electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove 1 of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline 2; The finger tip place of the close processing sections of described electrolyte transfer pipeline 2 is provided with plugging structure 3, and make electrolyte transfer pipeline 2 for blind hole structure, electrolyte can only flow out from narrow groove 1.
Under electric field action, workpiece anode dissolves in the electrolytic solution, reach the object of workpiece being carried out to dimensioned, in Electrolyzed Processing, the pressure of electrolyte is generally 4-6mMPa, electrode moves downward according to certain track, workbench is according to certain rotational speed, the two motion forms blade passage track, complete the processing of leaf dish runner, working (machining) efficiency can reach 1mm/min, process certain machine Pyatyi blisk to process 1 groove and need 30 minutes, process the time that a blisk needs one week, working (machining) efficiency more than 30% can be improved with overlaying processing, the surplus that blade profile is stayed evenly can reach 3.5mm.Provide favourable condition to follow-up blade profile electrolysis fine finishining, ensure that the realization of blisk precision ECM technology.
Described blisk electrolysis fluting electrode is install shaft part 4 away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place; The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually.
The overall length of described blisk electrolysis fluting electrode is 100mm, and wherein, the shaft part axial length that outer mold surface is provided with narrow groove 1 is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline 2 cross-sectional diameter of processing sections inside is φ 3.5mm; Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure 5 away from the installation shaft part 4 of finger tip.
A kind of blisk electrolysis fluting of the present invention processing method, is characterized in that: use blisk electrolysis fluting electrode as specific purpose tool, described blisk electrolysis fluting electrode integral is hollow finger; Electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove 1 of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline 2; The finger tip place of the close processing sections of described electrolyte transfer pipeline 2 is provided with plugging structure 3, and make electrolyte transfer pipeline 2 for blind hole structure, electrolyte can only flow out from narrow groove 1; Described blisk electrolysis fluting electrode is install shaft part 4 away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place; The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually;
Under electric field action, workpiece anode dissolves in the electrolytic solution, reaches the object of workpiece being carried out to dimensioned;
In electrochemical machining process, the pressure of electrolyte is 4-6MPa, electrode moves downward according to certain track, and workbench is according to certain rotational speed, and the two motion forms blade passage track, complete the processing of leaf dish runner, working (machining) efficiency can reach 1mm/min, processes certain machine Pyatyi blisk and processes 1 groove and need 30 minutes, process the time that a blisk needs one week, can improve working (machining) efficiency more than 30% with overlaying processing, the surplus that blade profile is stayed evenly can reach 3.5mm.Provide favourable condition to follow-up blade profile electrolysis fine finishining, ensure that the realization of blisk precision ECM technology.
The overall length of described blisk electrolysis fluting electrode is 100mm, and wherein, the shaft part axial length that outer mold surface is provided with narrow groove 1 is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline 2 cross-sectional diameter of processing sections inside is φ 3.5mm;
Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure 5 away from the installation shaft part 4 of finger tip.
Innovation main points of the present invention are also:
1, the outer mold surface of electrode is the outer shape of the maximum cross section that this runner obtained carry out demixing scan to the runner of blade in blisk part three dimensional design figure after does not interfere, and then the shape of electrode is calculated by rounding, it not a kind of simple geometric figure, object makes the shape of runner as far as possible close to the shape of blade profile by fluting Electrolyzed Processing, in follow-up Electrolyzed Processing, surplus is even, easily obtains high-precision accuracy of repetition.
2, the delivery port design of electrode, the delivery port design of electrode is very important to Electrolyzed Processing, which determine the quality in electrolyte flow field, in Electrolyzed Processing, flow field is not only directly connected to the height of Electrolyzed Processing precision, the quality of surface quality, even can determine that can Electrolyzed Processing be implemented, rational flow Field Design is that Electrolyzed Processing is able to successful basis.The head of electrode is processing integrated impeller blade root, its water yield wants large, and the water yield that the root of electrode is the water yield opposing headers of processing blade tip wants less, the uniformity in such guarantee flow field, according to requirements, the narrow groove processed at the head of electrode is comparatively dark, and more shallow in the degree of depth of the narrow groove of root, water yield is different, makes to obtain good flow field in Electrolyzed Processing.
The use of new electrode structure of the present invention, improves blisk electrolysis fluting working (machining) efficiency more than 30%, achieves better economic benefit.Novel electrode can ensure that fluting aft-loaded airfoil surplus is even, follow-up blisk blade profile precision ECM is processed and is achieved.Technical foundation has been established to realizing the processing of blisk precision ECM.
Accompanying drawing explanation
Below in conjunction with drawings and the embodiments, the present invention is further detailed explanation:
Fig. 1 is electrode structure sketch;
Fig. 2 is that blisk is slightly slotted method of loci machining sketch chart;
Fig. 3 is blisk fluting schematic diagram.
Detailed description of the invention
Embodiment 1
A kind of blisk electrolysis fluting electrode, it is characterized in that: described blisk electrolysis fluting electrode integral is hollow finger, electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove 1 of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline 2; The finger tip place of the close processing sections of described electrolyte transfer pipeline 2 is provided with plugging structure 3, and make electrolyte transfer pipeline 2 for blind hole structure, electrolyte can only flow out from narrow groove 1.
Under electric field action, workpiece anode dissolves in the electrolytic solution, reach the object of workpiece being carried out to dimensioned, in Electrolyzed Processing, the pressure of electrolyte is generally 4-6mMPa, electrode moves downward according to certain track, workbench is according to certain rotational speed, the two motion forms blade passage track, complete the processing of leaf dish runner, working (machining) efficiency can reach 1mm/min, process certain machine Pyatyi blisk to process 1 groove and need 30 minutes, process the time that a blisk needs one week, working (machining) efficiency more than 30% can be improved with overlaying processing, the surplus that blade profile is stayed evenly can reach 3.5mm.Provide favourable condition to follow-up blade profile electrolysis fine finishining, ensure that the realization of blisk precision ECM technology.
Described blisk electrolysis fluting electrode is install shaft part 4 away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place; The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually.
The overall length of described blisk electrolysis fluting electrode is 100mm, and wherein, the shaft part axial length that outer mold surface is provided with narrow groove 1 is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline 2 cross-sectional diameter of processing sections inside is φ 3.5mm; Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure 5 away from the installation shaft part 4 of finger tip.
A kind of blisk electrolysis fluting of the present embodiment processing method, is characterized in that: use blisk electrolysis fluting electrode as specific purpose tool, described blisk electrolysis fluting electrode integral is hollow finger; Electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove 1 of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline 2; The finger tip place of the close processing sections of described electrolyte transfer pipeline 2 is provided with plugging structure 3, and make electrolyte transfer pipeline 2 for blind hole structure, electrolyte can only flow out from narrow groove 1; Described blisk electrolysis fluting electrode is install shaft part 4 away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place; The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually;
Under electric field action, workpiece anode dissolves in the electrolytic solution, reaches the object of workpiece being carried out to dimensioned;
In electrochemical machining process, the pressure of electrolyte is 4-6MPa, electrode moves downward according to certain track, and workbench is according to certain rotational speed, and the two motion forms blade passage track, complete the processing of leaf dish runner, working (machining) efficiency can reach 1mm/min, processes certain machine Pyatyi blisk and processes 1 groove and need 30 minutes, process the time that a blisk needs one week, can improve working (machining) efficiency more than 30% with overlaying processing, the surplus that blade profile is stayed evenly can reach 3.5mm.Provide favourable condition to follow-up blade profile electrolysis fine finishining, ensure that the realization of blisk precision ECM technology.
The overall length of described blisk electrolysis fluting electrode is 100mm, and wherein, the shaft part axial length that outer mold surface is provided with narrow groove 1 is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline 2 cross-sectional diameter of processing sections inside is φ 3.5mm;
Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure 5 away from the installation shaft part 4 of finger tip.
The innovation main points of the present embodiment are also:
1, the outer mold surface of electrode is the outer shape of the maximum cross section that this runner obtained carry out demixing scan to the runner of blade in blisk part three dimensional design figure after does not interfere, and then the shape of electrode is calculated by rounding, it not a kind of simple geometric figure, object makes the shape of runner as far as possible close to the shape of blade profile by fluting Electrolyzed Processing, in follow-up Electrolyzed Processing, surplus is even, easily obtains high-precision accuracy of repetition.
2, the delivery port design of electrode, the delivery port design of electrode is very important to Electrolyzed Processing, which determine the quality in electrolyte flow field, in Electrolyzed Processing, flow field is not only directly connected to the height of Electrolyzed Processing precision, the quality of surface quality, even can determine that can Electrolyzed Processing be implemented, rational flow Field Design is that Electrolyzed Processing is able to successful basis.The head of electrode is processing integrated impeller blade root, its water yield wants large, and the water yield that the root of electrode is the water yield opposing headers of processing blade tip wants less, the uniformity in such guarantee flow field, according to requirements, the narrow groove processed at the head of electrode is comparatively dark, and more shallow in the degree of depth of the narrow groove of root, water yield is different, makes to obtain good flow field in Electrolyzed Processing.
The use of new electrode structure described in the present embodiment, improves blisk electrolysis fluting working (machining) efficiency more than 30%, achieves better economic benefit.Novel electrode can ensure that fluting aft-loaded airfoil surplus is even, follow-up blisk blade profile precision ECM is processed and is achieved.Technical foundation has been established to realizing the processing of blisk precision ECM.
As shown in Figure 1, its head is the working portion of Electrolyzed Processing to electrode structure described in the present embodiment, outer shape approximate cone-shape, and this is because integrated impeller blade opens wide shape radially, and diameter large-spacing is large, and the shape of runner becomes large gradually.Effluent trough is had at working portion, different according to the Flow Field Distribution fluting depth, if contoured surface can not realize, A/F difference also can be selected to change the size of flow.Electrode mid portion is a square shape, can be used for angle location or clamping use.The inner chamber of the rear section of electrode is the part be connected with electrolyte pipeline, have employed gas thread and connects, and has good sealing function after making to connect.Outside is the outer garden of φ 22mm, can be connected, by electrode holder on electrode pedestal, be fixed on lathe with the clamping part of electrode, keeps a relative correct position with workpiece.
Blisk is the new construction that forth generation engine adopts, blade and wheel disc are made of one by it, decrease tenon, tongue-and-groove and locking device that conventional leaf dish connects, avoid tenon and connect windage loss, alleviate construction weight and number of parts, increase substantially the operating efficiency of engine, thrust-weight ratio and reliability.
Blisk is complicated, required precision is high, employing NC milling difficulty, especially for adopting the leaf dish of aviation difficult-to-machine material manufacture to bring larger difficulty to numerical control milling, cutter loss is large, process-cycle is long, causes high manufacturing cost, will find a kind of high-quality, the method that efficient, low cost manufactures blisk for this reason.Electrolyzed Processing blisk working (machining) efficiency is high, and cost is low, according to abroad introduce Electrolyzed Processing comparatively digital control processing can improve working (machining) efficiency 30 ~ 60%, processing cost can reduce by 5 ~ 10 times.
Current domestic blisk Electrolyzed Processing instrument and supplies research is at the early-stage, is still in development.Adopt the trend of blisk and new model to develop, promote the needs of manufacturing technology in a large number according to aero-engine, it is very necessary for carrying out the research of blisk Electrolyzed Processing instrument and supplies.In recent years, my company and height carry out technological cooperation, the key problem in technology of blisk Electrolyzed Processing is breached in blisk Electrolyzed Processing, develop the equipment and process technology with independent intellectual property right, adopt Electrolyzed Processing blisk of engine to be feasible, the object of engine leaf dish part high-quality, efficient, low cost processing can be met.
Blisk Electrolyzed Processing is all generally completed by thick, smart two road manufacturing procedures, i.e. electrolysis fluting roughing, blade profile essence Electrolyzed Processing.The electrolysis machine tool of roughing mainly removes excess metal expeditiously, processes blade profile runner at Ye Panshang, and leaves uniform allowance to subsequent handling.Fine finishining is the final processing ensureing precision of blades, reaches the requirement of design drawing.
Roughing fluting has jacking and method of loci two kinds.The program is method of loci processing, and it is a kind of method of simple possible.Machine tool structure is simple, and forms of motion is easy to realize.The method adopts worktable rotary to drive workpiece to rotate, and main tapping band moving electrode moves downward, and the resultant motion of the two is a spiral trajectory.So just, on workpiece, form runner between a leaf, as shown in Figure 2 and Figure 3.
Often process a runner in process after, leaf dish rotates fixing angle, i.e. a calibration, processes next runner, through reprocessabilty, leaf dish forms runner between equidistant leaf.By scheming above, electrolysis machine tool has two main movements, and namely main shaft moves up and down V z, worktable rotary motion n, adds synkinesia, as the adjustment V of radial distance x, main shaft is to the adjustment V of workbench center ydeng.After the processing of blisk electrolysis fluting, just can carry out the precision ECM processing of leaf dish blade profile.

Claims (4)

1. blisk electrolysis fluting electrode, it is characterized in that: described blisk electrolysis fluting electrode integral is hollow finger, electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove (1) of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline (2); The finger tip place of the close processing sections of described electrolyte transfer pipeline (2) is provided with plugging structure (3), makes electrolyte transfer pipeline (2) be blind hole structure, and electrolyte can only flow out from narrow groove (1);
Described blisk electrolysis fluting electrode is install shaft part (4) away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place;
The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually.
2. according to blisk electrolysis fluting electrode described in claim 1, it is characterized in that: the overall length of described blisk electrolysis fluting electrode is 100mm, wherein, the shaft part axial length that outer mold surface is provided with narrow groove (1) is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline (2) cross-sectional diameter of processing sections inside is φ 3.5mm;
Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure (5) away from the installation shaft part (4) of finger tip.
3. blisk electrolysis fluting processing method, is characterized in that: use blisk electrolysis fluting electrode as specific purpose tool, described blisk electrolysis fluting electrode integral is hollow finger; Electrode interior is that hollow-core construction is mainly as the passage of electrolyte, in its outer mold surface in one section of finger tip place≤1/2 total length, along the circumferential direction 1/3-1/2 place has the wide narrow groove (1) of a 0.6mm, so that electrolyte is communicated to processing district by narrow groove every 1mm; Described blisk electrolysis fluting electrode interior is provided with electrolyte transfer pipeline (2); The finger tip place of the close processing sections of described electrolyte transfer pipeline (2) is provided with plugging structure (3), makes electrolyte transfer pipeline (2) be blind hole structure, and electrolyte can only flow out from narrow groove (1); Described blisk electrolysis fluting electrode is install shaft part (4) away from one end of finger tip, and its external diameter is more than 1.5 times of the processing sections external diameter at finger tip place; The processing sections outer mold surface at finger tip place is the pyramidal structure of gradual change, and the outer mold surface external diameter away from finger tip place becomes large gradually;
Under electric field action, workpiece anode dissolves in the electrolytic solution, reaches the object of workpiece being carried out to dimensioned;
In electrochemical machining process, the pressure of electrolyte is 4-6MPa, and electrode moves downward according to certain track, and workbench is according to certain rotational speed, and the two motion forms blade passage track, and complete the processing of leaf dish runner, the surplus that blade profile is stayed is 3.5mm.
4., according to blisk electrolysis fluting processing method described in claim 3, it is characterized in that: the overall length of described blisk electrolysis fluting electrode is 100mm, wherein, the shaft part axial length that outer mold surface is provided with narrow groove (1) is 32mm; The finger tip end outer mold surface external diameter of processing sections is φ 5mm, away from processing sections finger tip and be 55mm with the axle head total length that processing sections outer mold surface forms continuous conical surfaces, electrolyte transfer pipeline (2) cross-sectional diameter of processing sections inside is φ 3.5mm;
Described blisk electrolysis fluting electrode is provided with screw-internal thread fit structure (5) away from the installation shaft part (4) of finger tip.
CN201210367002.5A 2012-09-28 2012-09-28 Electrode and machining method for electrolytic grooving of blisks Active CN102873416B (en)

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CN104400163B (en) * 2014-09-29 2017-12-29 沈阳黎明航空发动机(集团)有限责任公司 A kind of blisk electrolysis fluting processing annular electrode and process
CN104476363B (en) * 2014-11-13 2017-01-18 沈阳黎明航空发动机(集团)有限责任公司 Method for using honeycomb grinding machine to process radial slot or small waist type slot
CN109158721B (en) * 2018-09-27 2020-06-12 中国航空制造技术研究院 Blisk electrolytic machining method
CN110605445B (en) * 2019-08-16 2020-08-21 南京航空航天大学 Electrochemical machining method for non-uniform-speed double-rotation blisk cascade channel
CN110883393A (en) * 2019-12-06 2020-03-17 常州工学院 Cathode for large-cutting-depth numerical control electrolytic machining

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