Electrolytic machining apparatus and method for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode

Abstract

An electrolytic machining apparatus and method for the entire mold surface of a shrouded wing by in-situ deformation of an integrated cathode, belonging to the field of electrolytic machining, wherein the wing ventral / wing dorsal cathode body in the apparatus is composed of a cathode base, shroud edge plate cathode, wing body cathode, dovetail edge plate cathode, shroud side watertight block, dovetail side watertight block, and upper end watertight block, and during machining, the drive device and deformation mechanism cause both side edge plate cathodes to be initially retracted inward, and as the wing body mold surface is machined and the wing body mold surface is machined to a predetermined depth, both side edge plate cathodes generate an outward expansion movement, thereby machining the wing body mold surface and simultaneously causing the both side edge plate cathodes to generate in-situ oscillating deformation that approaches the edge plate mold surfaces on both sides of the wing, thereby achieving synchronous electrolytic machining of the wing body and both side edge plate entire mold surfaces of the shrouded wing, and the apparatus can improve machining efficiency, machining accuracy, and surface quality, and has a relatively good prospect for practical application.

Description

Technical Field

[0001] The present invention relates to an electrochemical machining apparatus and method for the full profile of a shrouded blade by in-situ deformation of an integral cathode, belonging to the technical field of electrochemical machining.

Background Art

[0002] Shrouded blade members are widely applied in fields such as aviation and aerospace. The working environment is harsh, and the manufacturing quality plays a very important role in the performance of the components. These components usually have characteristics such as complex structures of the blade body, double tails, and shroud double-edge plates, twisted and thin profiles, difficult-to-machine materials, many types, high quality requirements, and large processing difficulties. The high-efficiency and high-precision manufacturing of the full profile of the blade body, double-tail side-edge plates, and shroud side-edge plates has become a bottleneck problem.

[0003] Electrochemical machining is a special machining technology that removes workpiece materials based on the principle of electrochemical anodic dissolution. It has advantages such as no tool loss, high processing efficiency, good processing surface quality, and not being limited by the hardness and strength of the anode material itself. As an auxiliary technology for conventional machining technologies such as mechanical cutting, it has become one of the mainstream manufacturing technologies for manufacturing complex structural members of difficult-to-machine materials in aeroengines and is very suitable for the high-efficiency and high-precision manufacturing of the full profile of shrouded blades made of difficult-to-machine materials.

[0004] Currently, the electrochemical machining method for shrouded blades usually uses the two-way feed mode of the tool cathode. In this method, the feed direction of the tool cathode is parallel to the two side-edge plates of the blade, and there is no feed component to the two side-edge plates. There is a side gap between the edge plate and the tool cathode, and the edge plate is formed by dissolving the side surface. Moreover, the previously machined edge plate is easily affected by secondary corrosion, and finally, a certain inclination (i.e., taper) occurs on the edge plate profile. In some cases, excessive cutting occurs, resulting in low forming accuracy and poor surface quality, and the high-efficiency and high-precision manufacturing of the full profile of shrouded blades cannot be achieved.

[0005] To reduce the taper of the edge plate mold surface and improve forming accuracy and surface quality, the tool cathode sidewall is usually insulated to weaken the stray electric field. However, this method has limited effectiveness, and the edge plate mold surface still retains some taper. Alternatively, by attaching an auxiliary anode to the cathode sidewall and applying a constant potential difference between the blade workpiece and the auxiliary anode, the electric field distribution and power line direction in the side gap can be altered. A portion of the previously processed edge plate mold surface can function as the cathode, further reducing stray current corrosion based on the insulated cathode sidewall and further reducing the taper of the edge plate mold surface. However, according to electrolytic machining side forming theory, the above method cannot completely eliminate the taper of the edge plate mold surface. Therefore, in typical cases, to avoid over-cutting of the edge plate mold surface, a method of reducing the cathode width is used to leave a certain margin on the edge plate mold surface, and finally, post-processing with other conventional machining methods is required, which is time-consuming and labor-intensive.

[0006] As is clear from the above, in order to achieve highly efficient and high-precision electrochemical manufacturing of the entire mold surface of the wing body and side edge plates of a shrouded wing by electrolytic machining, it is necessary to solve the difficult problem that in electrolytic machining of shrouded wings, there is no feed component on the mold surface of the side edge plates, secondary stray corrosion exists, and surface quality and machining accuracy are low, while at the same time avoiding defects such as tool marks.

[0007] The patent "Electrolytic Machining Method for Triaxial Flexible Feed Blades" (application number 200610040556.9, applicant: Nanjing University of Aeronautics and Astronautics, inventors: Zhu Di, Xu Zhengyang, and Shi Xianchuan) proposes an electrolytic blade machining method that performs simultaneous triaxial feeding using a wing ventral cathode, wing dorsal cathode, and anode workpiece, enabling full-surface machining of single-edge plate blades. In contrast, this patent enables full-surface machining of shrouded blades through the simple linear motion of an integrated wing ventral / wing dorsal cathode and a corresponding through-axis linear motor.

[0008] The article "New Developments in Electrolytic Machining Technology for Wings" (Authors: Wang Jianye, Lin Suwen, Aviation Technology, 1998, No. 6) describes how British company R·R uses oblique feed and a composite double-acting electrode to machine the entire surface of a single-edge plate wing, thus avoiding secondary corrosion of the machined surface. In contrast, this patent enables the machining of the entire surface of a shrouded wing using an integrated cathode that includes both side edge plate cathodes and the wing body cathode.

[0009] The article "Optimization and Test Study of Flow Field for Electrolytic Machining of Double-Edged Plate Blades" (Authors: Qian Hao, Liu Jia, Wang Hao, Zhu Di, Machine Manufacturing Co., Ltd., Article No. 1671-5276(2020)02-0007-05) proposes a flow field mode for electrolytic machining of the blade body of a double-edged plate blade, in which liquid is supplied in multiple directions along the feed direction. While this can avoid liquid depletion, it makes it difficult to guarantee surface quality and machining accuracy because the mold surfaces of both side edged plates are formed from the sides. In contrast, this patent proposes a multi-channel coordinated liquid supply mode for the entire mold surface covering both side edged plates and the blade body, and also includes a feed component on the mold surfaces of both side edged plates.

[0010] The article "Study on surface roughness of large size TiAl intermetallic blade in electrochemical machining" (Authors: Yudi Wang Zhengyang Xu Deman Meng Lin Liu Zhongdong Fang, Journal of Manufacturing Processes, 2020, No. 76) proposes a stepwise variable parameter machining strategy and a multi-channel non-isobaric flow mode at the electrolyte inlet for the electrochemical machining of the blade body of a large TiAl alloy shrouded wing. While this overcomes the "mottled" morphology and flow-strip defects of the blade body of the TiAl alloy shrouded wing, the side edge plate mold surfaces are formed from the sides, requiring improvement in surface quality and machining accuracy. In contrast, this patent enables synchronous machining of the entire mold surface of a shrouded wing.

[0011] The patent "Electrolytic Machining Apparatus and Method for Dual-Flow Channel Members with Multi-Cathode Coordinated Feed" (Application No. 202310006903.X, Applicant: Nanjing University of Aeronautics and Astronautics, Inventors: Zhu Dong, Chen Liyong, Zhu Di) proposes an electrolytic machining method with coordinated feeding of three tool cathodes: left, center, and right. The central tool cathode is fed linearly, while the two left and right tool cathodes slide close to the central tool cathode via an inclined surface. This enables simultaneous machining of the inner and outer channels of the dual-flow channel member and the wing body. However, using multiple electrodes makes tool mark defects likely to occur on the workpiece surface. In contrast, this patent uses an integrated type including both side edge plate cathodes and the wing body cathode, enabling synchronous machining of the entire surface of a shrouded wing with simple linear feeding. The tool cathode structure and motion are simple and easy to implement, and there are no tool mark defects.

[0012] The patent "ELECTROCHEMICAL MACHINING METHOD AND ELECTROCHEMICAL MACHINING DEVICE" (application number 06780652.1, applicants IHI Corporation and APC Aerospecialty, inventor FUJIHARA Yasuo) describes a method that uses two tool cathodes to achieve full-surface machining of both side edge plates and the blade body of a shrouded blade using a three-axis, three-directional synchronous motion system. However, this method has a complex tool cathode structure and motion type, and the two tool cathodes tend to cause tool mark defects on the workpiece surface. In contrast, this patent uses an integrated cathode to achieve synchronous machining of the entire surface of a shrouded blade through simple synchronous linear motion of the machine tool spindle and through-shaft linear motor, resulting in a simple tool cathode structure and motion type and no tool mark defects.

[0013] The patent "MULTIPART ELECTRODE ARRAY AND METHOD FOR THE ELECTROCHEMICAL TREATMENT OF BLADES HAVING SHROUDING BANDS" (Patent No. US 9682437 B2, applicant: MTU Aero Engines AG, inventor: Albin Platz Daniela Arbinger) describes machining the side edge plates and blade body of a shrouded blade using three tool cathodes and achieving relative sliding motion through bevel contact. However, the use of three tool cathodes is prone to generating tool marks on the workpiece surface, and the motion is complex. In contrast, this patent uses a single cathode and combines it with simple linear motion to achieve synchronous machining of the entire surface of a shrouded blade, resulting in a simple tool cathode structure and motion, and eliminating tool marks.

[0014] Because the blade body mold surface and the side edge plate mold surfaces of a shrouded blade are perpendicular to each other at approximately 90°, the feed direction of the tool cathode differs significantly between the blade body mold surface and the side edge plate mold surfaces, posing a major challenge to the full-surface electrolytic machining of shrouded blades. If an integrated tool cathode including the side edge plates and blade body is available, and if the side edge plate cathodes can generate a simple oscillating deformation motion, then synchronous electrolytic machining of the full-surface of a shrouded blade can be achieved without tool mark defects. Therefore, the present invention proposes an electrolytic machining apparatus and method for the full-surface of a shrouded blade by in-situ deformation of an integrated cathode. [Overview of the project] [Problems that the invention aims to solve]

[0015] The object of the present invention is to propose an electrolytic machining apparatus and method for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode, in order to achieve synchronous, highly efficient, and high-precision electrolytic machining of the entire surface of a shrouded wing, avoid the occurrence of tool mark defects, and at the same time ensure the machining accuracy and surface quality of the side edge plate surface and the wing body surface of the shrouded wing. [Means for solving the problem]

[0016] Specifically, the present invention first provides an electrolytic processing apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode, the apparatus comprising a wing ventral / wing dorsal cathode body, a wing ventral / wing dorsal drive device, and a wing ventral / wing dorsal deformation mechanism, the wing ventral / wing dorsal drive device comprising a through-shaft linear motor, an insulating connecting plate, and a motor through-shaft, the insulating connecting plate being fixed to the front of the through-shaft linear motor, the motor through-shaft being mounted inside the through-shaft linear motor, and the forward or reverse rotation of the through-shaft linear motor drives its reciprocating linear motion in the forward and backward direction, the wing ventral / wing dorsal cathode The electrode body consists of a cathode base, a shroud edge plate cathode, a wing body cathode, a dovetail edge plate cathode, a shroud side watertight block, a dovetail side watertight block, and an upper end watertight block. The rear end of the cathode base is attached to the front side of the insulating connection plate, and the cathode base is divided into a rear cathode base and a front cathode base. The shroud side watertight block, the dovetail side watertight block, and the upper end watertight block are located above the rear cathode base, the lower end surface of the shroud side watertight block is connected to the left side of the rear cathode base, and the lower end surface of the dovetail side watertight block is connected to the rear cathode base. The upper end watertight block is connected to the right side of the section and is mounted above the shroud side watertight block and the dovetail side watertight block. The shroud edge plate cathode, the wing body cathode, and the dovetail edge plate cathode are located above the front of the cathode base. The lower end surface of the wing body cathode is connected to the front of the cathode base. The left end surface of the wing body cathode is connected to the front of the shroud edge plate cathode. The right end surface of the wing body cathode is connected to the front of the dovetail edge plate cathode. The cathode base is surrounded by the shroud edge plate cathode, the wing body cathode, the dovetail edge plate cathode, the shroud side watertight block, and the dovetail side watertight block. The space above the wing is referred to as the deformation mechanism mounting cavity, and the ventral / dorsal wing deformation mechanism is located within the deformation mechanism mounting cavity and consists of an insulating block, a push rod, a first connecting rod, and a second connecting rod. The insulating block is attached to the front end of the motor through shaft, the rear end of the push rod is connected to the insulating block, the front end of the push rod is connected to the rear end of the first connecting rod and the rear end of the second connecting rod, respectively, the front end of the first connecting rod is connected to the rear side of the shroud edge plate cathode, and the front end of the second connecting rod is connected to the rear side of the dovetail edge plate cathode.

[0017] In the electrolytic machining apparatus for the entire mold surface of a shrouded wing by in-situ deformation of an integrated cathode disclosed in the embodiments of this application, the cathode base, shroud edge plate cathode, wing body cathode, dovetail edge plate cathode, shroud side watertight block, and dovetail side watertight block are an integrated structure. Synchronous electrolytic machining of the mold surfaces of both side edge plates of the shrouded wing and the entire mold surface of the wing body can be achieved, improving machining efficiency and machining quality while simultaneously avoiding the occurrence of tool mark defects.

[0018] In the electrolytic machining apparatus for the entire surface of a shrouded blade by in-situ deformation of an integrated cathode disclosed in the embodiments of this application, microslits are provided at the joint between the blade body cathode and the shroud edge plate cathode, at the joint between the blade body cathode and the dovetail edge plate cathode, and above and below the joint. This structure reduces stress concentration at the joint and increases the flexibility of in-situ oscillation of the side edge plate cathodes.

[0019] In the electrolytic machining apparatus for a shrouded wing with an integrated cathode that undergoes in-situ deformation as disclosed in the embodiments of the present application, a relief notch is provided at the front of the cathode base to avoid interference with the shroud edge plate cathode and the dovetail edge plate cathode during deformation. This notch allows both side edge plate cathodes to oscillate and deform in in-situ, while simultaneously avoiding collisions between the side edge plate cathodes and the shroud-side watertight block and the dovetail-side watertight block.

[0020] In the electrolytic machining apparatus for the entire mold surface of a shrouded blade by in-situ deformation of an integrated cathode disclosed in the embodiments of the present application, the outer surfaces of the shroud edge plate cathode and the dovetail edge plate cathode are slopes having a constant angle (0° to 2°), and the thickness gradually increases from the rear end to the front end. This structure allows for a larger gap between the side edge plate cathodes and the mold surfaces of the side edge plates of the blade blank when the side edge plate cathodes are pulled inward, thereby reducing secondary electrochemical corrosion of the side edge plate mold surfaces.

[0021] The electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode disclosed in the embodiments of the present application further includes a shrouded wing jig, which includes a jig wing ventral water stop plate, a jig wing dorsal water stop plate, a shroud retaining block, and a dovetail retaining block, the shroud retaining block and the dovetail retaining block being connected to the left and right sides of the jig body, respectively, and further includes a first side wall insulating plate connected between the jig wing ventral water stop plate and the shroud retaining block, a second side wall insulating plate connected between the shroud retaining block and the jig wing dorsal water stop plate, a third side wall insulating plate connected between the dovetail retaining block and the jig wing dorsal water stop plate, and a fourth side wall insulating plate connected between the jig wing ventral water stop plate and the dovetail retaining block, and further includes a jig upper cover, the jig upper cover being provided with an electrolyte inlet housing cavity. The device provides a jig structure for simultaneously positioning, clamping, and energizing both ends of a shrouded wing. Compared to positioning, clamping, and energizing only one side of the shrouded wing, the mounting and clamping are more robust and reliable, preventing one-sided oscillation of the cantilever of the shrouded wing, improving machining stability and accuracy, and ensuring a sufficient energizing area to prevent burnout.

[0022] Furthermore, this application provides a method for using an electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of the above-mentioned integrated cathode, comprising the steps of: 1) dividing the cathode body into a wing ventral cathode body and a wing dorsal cathode body, dividing the drive device into a wing ventral drive device and a wing dorsal drive device, and dividing the deformation mechanism into a wing ventral deformation mechanism and a wing dorsal deformation mechanism; 2) integrally mounting the wing ventral drive device and the wing ventral cathode body to the Y1 axis of the machine tool, integrally mounting the wing dorsal drive device and the wing dorsal cathode body to the Y2 axis of the machine tool, 3) mounting the shrouded wing jig to the workbench of the machine tool, and 4) attaching the wing blank to the shrouded wing jig. Step 2) involves attaching and firmly pressing the blade, then setting the tool and leaving a certain initial machining gap; starting the ventral and dorsal wing through-axis linear motors, causing the ventral and dorsal wing motor through-axis shafts to move linearly backward, and the tensile force of the connecting rods causes the shroud edge plate cathodes and dovetail edge plate cathodes on both sides to be pulled inward to their predetermined positions and come to rest; connecting the ventral and dorsal wing cathode bodies to the negative terminal of the power supply, and connecting the wing blank to the positive terminal of the power supply; and then high-pressure, high-speed electrolyte flows into the machining area, and the shroud Step 5) covers the entire mold surface of the wing with a dovetail, and Step 6) starts the power supply, and the wing ventral drive unit and wing ventral cathode body, and the wing dorsal drive unit and wing dorsal cathode body are driven by the Y1 axis and Y2 axis of the machine tool, respectively, and are gradually approached by the wing body while being fed to each other at a predetermined speed, and the wing body mold surface is gradually formed by electrochemical action, and when the wing body mold surface is machined to a predetermined depth, the wing ventral through-shaft linear motor and the wing dorsal through-shaft linear motor are started in sync, and the through-shaft of linear motion is driven by the push rod, the first connecting rod and the second connecting rod on both sides Step 7) involves pushing the loud edge plate cathode and dovetail edge plate cathode to generate an outward expansion motion, thereby machining the wing body mold surface and simultaneously causing the edge plate cathodes on both sides to undergo in-situ oscillating deformation that approaches the side edge plate mold surfaces of the wing, that is, the entire mold surface of the wing body and side edge plates having a feed component, and when the Y1 and Y2 axes of the machine tool are moved to the final machining position, the spindle of the machine tool, the wing ventral through-axis linear motor and the wing dorsal through-axis linear motor are stopped simultaneously, completing the synchronous electrolytic machining of the entire mold surface of the wing body and side edge plates of the shrouded wing, and ending the machining process, and then turning off the power,This includes step 9) stopping the liquid supply from the electrolyte pump.

[0023] Furthermore, in the method of using the electrolytic machining apparatus for the entire mold surface of a shrouded blade by in-situ deformation of the integrated cathode described above, a new mode of multi-channel coordinated liquid supply for the entire mold surface is employed. Specifically, multiple electrolyte channels are provided on both side edge plates and the blade body portion of the shrouded blade, and during machining, the multiple electrolyte channels coordinately supply the liquid, so that the flow field covers the entire mold surface of the shrouded blade, improving the stability and reachability of the flow field. At the same time, this flow field mode divides the machining area into multiple small flow regions, improving the uniformity of the flow field and the cleaning action. [Effects of the Invention]

[0024] Compared to the prior art, the apparatus and method provided in this application have the following beneficial effects. (1) The apparatus of the present invention innovates the structure of the tool cathode for electrolytic machining of the entire surface of a shrouded blade, designing an integrated cathode that can control deformation including both side edge plate cathodes and the blade body cathode, and the side edge plate cathodes can achieve in-situ oscillating deformation by being driven by a through-shaft linear motor, the configuration is simple, the flexibility is good, and the occurrence of tool marks on the surface of the anode workpiece can be avoided. (2) The electrolytic machining method for the entire surface of a shrouded wing is innovated. During machining, the edge plate cathodes on both sides of the integrated cathode are initially pulled inward by the tensile force of a through-shaft linear motor. The drive unit and the integrated cathode are driven by the spindle of the machine tool and gradually approach the wing body in an integrated manner. When the wing body surface is machined to a predetermined depth, the through-shaft linear motor is activated synchronously. Its thrust action causes the edge plate cathodes on both sides to expand outward in-situ oscillating deformation. As a result, the wing body and both edge plates of the shrouded wing have a feed component, ensuring machining accuracy and surface quality. Synchronized, highly efficient, and high-precision manufacturing of the entire surface of a shrouded wing is achieved, and the method is simple to operate and highly feasible. (3) The present invention enables synchronous machining of the entire surface of a shrouded wing simply by having the integrated cathode and the through shaft of the through-shaft linear motor move horizontally in a plane, and the motion is simple and the operation is convenient. (4) Wide application range: By slightly adjusting the integrated cathode, the present invention can also be applied to the synchronous machining of the entire surface of members such as single-edge plate wings and shrouded integrated blisks, and has relatively good versatility.

Brief Description of the Drawings

[0025] [Figure 1] It is a three-dimensional overall schematic diagram of an electrolytic machining device for the entire surface of a wing with a shroud by the in-situ deformation of an integrated cathode. [Figure 2] It is a three-dimensional internal structure diagram of an electrolytic machining device for the entire surface of a wing with a shroud by the in-situ deformation of an integrated cathode. [Figure 3] It is a schematic structural diagram of an integrated cathode of a wing with a shroud. [Figure 4] It is a schematic diagram of the synchronous electrolytic machining process for the entire surface of a wing with a shroud by the in-situ deformation of an integrated cathode.

Embodiments for Carrying out the Invention

[0026] Hereinafter, the present invention will be described in more detail with reference to specific drawings.

[0027] As shown in FIGS. 1 to 4, the electrolytic machining method for the entire surface of a wing with a shroud by the in-situ deformation of an integrated cathode according to the present invention mainly includes the following steps: In step 1), as shown in FIGS. 1 to 3, the cathode body is divided into a wing belly-side cathode body and a wing back-side cathode body, the driving device is divided into a wing belly-side driving device and a wing back-side driving device, and the deformation mechanism is divided into a wing belly-side deformation mechanism and a wing back-side deformation mechanism. In step 2), the wing belly-side driving device and the wing belly-side cathode body are integrally mounted on the Y1 axis of the machine tool, the wing back-side driving device and the wing back-side cathode body are integrally mounted on the Y2 axis of the machine tool, the wing with a shroud jig is mounted on the workbench of the machine tool, the blank of the wing is mounted on the wing with a shroud jig, firmly pressed, and then the tool is set to leave a certain initial machining gap. The initial angle of the outer slope of the shroud edge plate cathode and the double-tail edge plate cathode is 2° (specifically, when implemented, the initial angle of this slope may be 0 to 2°). In step 3), the ventral-wing through-shaft linear motor 1 and the dorsal-wing through-shaft linear motor 9 are started, and the ventral-wing motor through-shaft 12 and the dorsal-wing motor through-shaft 21 move linearly backward, and due to the tensile force of the connecting rod, the shroud edge plate cathodes 32 and dovetail edge plate cathodes 36 on both sides are pulled inward to a predetermined position and come to rest. In this embodiment, this position is where the cathode rod has moved 4 mm along the negative Y direction, and at this time, the angle of the outer slopes of the shroud edge plate cathode and the dovetail edge plate cathode is open to 10°. In step 4), the ventral and dorsal cathode bodies of the wing are connected to the negative terminal of the power supply, and the wing blank is connected to the positive terminal of the power supply. In step 5), high-pressure, high-speed electrolyte flows into the processing area, covering the entire surface of the shrouded blade. In step 6), the power supply is activated, and the ventral wing drive unit and the ventral wing cathode body, and the dorsal wing drive unit and the dorsal wing cathode body are driven by the Y1 axis and Y2 axis of the machine tool, respectively, and are moved toward each other at a predetermined speed, gradually approaching the wing body, and gradually forming the wing body mold surface by electrochemical action. In step 7), as shown in Figure 4, once the wing body mold surface is machined to a predetermined depth, the wing ventral through-axis linear motor 1 and the wing dorsal through-axis linear motor 9 are started synchronously. The linear motion of the through-axis pushes the shroud edge plate cathodes and dovetail edge plate cathodes on both sides via the push rod 30, the first connecting rod 31, and the second connecting rod 37, generating an outward expansion motion. This processes the wing body mold surface while simultaneously causing the edge plate cathodes on both sides to undergo in-situ oscillating deformation, that is, the entire mold surface of the wing body and both side edge plates has a feed component. In step 8), when the Y1 and Y2 axes of the machine tool are moved to the final machining position, the spindle of the machine tool, the ventral-side through-axis linear motor 1, and the dorsal-side through-axis linear motor 9 are stopped simultaneously, completing the synchronous electrolytic machining of the entire surface of the wing body and both side edge plates of the shrouded wing, and the machining is finished. In step 9), the power is turned off and the liquid supply from the electrolyte pump is stopped. [Explanation of symbols]

[0028] 1. Linear motor with ventral shaft for wing 2. Wing ventral insulating connection plate 3. Upper cover of the jig 4. Electrolyte inlet cavity 5, 1st electrolyte inlet 6, 2nd electrolyte inlet 7, 3rd electrolyte inlet 8. Linear motor with through-shaft on the dorsal side of the wing 9. Wing dorsal insulating connection plate 10, 4th electrolyte inlet 11, 5th electrolyte inlet 12. Wing ventral side motor through shaft 13. Shroud-side watertight block 14. Upper end watertight block 15. Water-stopping plate on the ventral side of the jig wing 16. First side wall insulating plate 17. Shroud retaining block 18. Shroud-side energized block 19. Wings with shrouds 20. Second side wall insulating plate 21. Wing dorsal motor through shaft 22. Jig wing dorsal water stopper plate 23. Third side wall insulating plate 3 24. Dovetail retaining block 25. Dovetail-side energized block 26. Jig body 27. Fourth side wall insulating plate 28. Annular seal gasket 29. Insulating block 30. Pushrod 31. First connecting rod 32. Shroud edge plate cathode 33. Wing body cathode 34. Cathode base 35. Microslit 36. Dovetail edge plate cathode 37. Second connecting rod 38. Dovetail side watertight block.

Claims

1. An electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode, Including the ventral / dorsal wing cathode body, the ventral / dorsal wing drive device, and the ventral / dorsal wing deformation mechanism, The ventral / dorsal wing drive device includes a through-shaft linear motor, an insulating connecting plate (2), and a motor through-shaft. The insulating connecting plate (2) is fixed to the front of the through-shaft linear motor, and the motor through-shaft is mounted inside the through-shaft linear motor. The forward or reverse rotation of the through-shaft linear motor drives its reciprocating linear motion in the longitudinal direction. The ventral / dorsal wing cathode body is composed of a cathode base (34), a shroud edge plate cathode (32), a wing body cathode (33), a dovetail edge plate cathode (36), a shroud side watertight block (13), a dovetail side watertight block (38), and an upper end watertight block (14). The rear end of the cathode base (34) is attached to the front side of the insulating connection plate (2), and the cathode base (34) is divided into a rear cathode base and a front cathode base. The shroud-side watertight block (13), the dovetail-side watertight block (38), and the upper end watertight block (14) are located above the rear of the cathode base, the lower end surface of the shroud-side watertight block (13) is connected to the left side of the rear of the cathode base (34), the lower end surface of the dovetail-side watertight block (38) is connected to the right side of the rear of the cathode base (34), and the upper end watertight block (14) is mounted above the shroud-side watertight block (13) and the dovetail-side watertight block (38). The shroud edge plate cathode (32), the wing body cathode (33), and the dovetail edge plate cathode (36) are located above the front of the cathode base, the lower end surface of the wing body cathode (33) is connected to the front end of the cathode base (34), the left end surface of the wing body cathode (33) is connected to the front side of the shroud edge plate cathode (32), and the right end surface of the wing body cathode (33) is connected to the front side of the dovetail edge plate cathode (36). The space above the cathode base (34), surrounded by the shroud edge plate cathode (32), the wing body cathode (33), the dovetail edge plate cathode (36), the shroud side watertight block (13), and the dovetail side watertight block (38), is referred to as the deformation mechanism mounting cavity. The ventral / dorsal wing deformation mechanism is located within a deformation mechanism mounting cavity and consists of an insulating block (29), a push rod (30), a first connecting rod (31), and a second connecting rod (37), the insulating block (29) is attached to the front end of the motor through shaft, the rear end of the push rod (30) is connected to the insulating block (29), the front end of the push rod (30) is connected to the rear end of the first connecting rod (31) and the rear end of the second connecting rod (37), respectively, the front end of the first connecting rod (31) is connected to the rear side of the shroud edge plate cathode (32), and the front end of the second connecting rod (37) is connected to the rear side of the dovetail edge plate cathode (36), characterized in that an electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode is provided.

2. The electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode, as described in claim 1, characterized in that the cathode base (34), shroud edge plate cathode (32), wing body cathode (33), dovetail edge plate cathode (36), shroud side watertight block (13), and dovetail side watertight block (38) are integrally structured.

3. The electrolytic processing apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode according to claim 2, characterized in that microslits (35) are opened at the joint between the wing body cathode (33) and the shroud edge plate cathode (32), at the joint between the wing body cathode (33) and the dovetail edge plate cathode (36), and above and below the joints.

4. The electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode, characterized in that a relief notch is provided at the front of the cathode base (34) to avoid interference with the shrouded edge plate cathode (32) and the dovetail edge plate cathode (36) during deformation.

5. The electrolytic machining apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode according to claim 1, characterized in that the outer surfaces of the shrouded edge plate cathode (32) and the dovetail edge plate cathode (36) are slopes having a certain angle, and the thickness gradually increases from the rear end to the front end.

6. The wing fixture with shroud further includes a fixture wing ventral water stop plate (15), a fixture wing dorsal water stop plate (22), a shroud retaining block (17), and a dovetail retaining block (24), the shroud retaining block (17) and the dovetail retaining block (24) being connected to the left and right sides of the fixture body (26), respectively, and a first side wall insulating plate (16) connected between the fixture wing ventral water stop plate (15) and the shroud retaining block (17), and between the shroud retaining block (17) and the fixture wing dorsal water stop plate (22). The electrolytic processing apparatus for the entire surface of a shrouded wing by in-situ deformation of an integrated cathode according to claim 1, further comprising a connected second side wall insulating plate (20), a third side wall insulating plate (23) connected between a dovetail retaining block (24) and a jig wing dorsal water stop plate (22), and a fourth side wall insulating plate (27) connected between a jig wing ventral water stop plate (15) and a dovetail retaining block (24), further comprising a jig upper cover (3), wherein the jig upper cover (3) is provided with an electrolyte inlet housing cavity (4).

7. A method for using an electrolytic machining apparatus for the entire surface of a shrouded blade by in-situ deformation of an integrated cathode as described in claim 1, Step 1) divides the cathode body into a wing-ventral cathode body and a wing-dorsal cathode body, divides the drive unit into a wing-ventral drive unit and a wing-dorsal drive unit, and divides the deformation mechanism into a wing-ventral deformation mechanism and a wing-dorsal deformation mechanism, Step 2) involves mounting the ventral wing drive unit and the ventral wing cathode body integrally on the Y1 axis of the machine tool, mounting the dorsal wing drive unit and the dorsal wing cathode body integrally on the Y2 axis of the machine tool, mounting the shrouded wing jig on the workbench of the machine tool, mounting the wing blank on the shrouded wing jig and pressing it firmly, then setting the tool and leaving a certain initial machining gap, Step 3) involves starting the ventral-wing through-shaft linear motor (1) and the dorsal-wing through-shaft linear motor (9), causing the ventral-wing motor through-shaft (12) and the dorsal-wing motor through-shaft (21) to move linearly backward, and the tensile force of the connecting rods causing the shroud edge plate cathodes (32) and dovetail edge plate cathodes (36) on both sides to be pulled inward to a predetermined position and come to rest. Step 4) connects the ventral and dorsal cathode bodies of the wing to the negative terminal of the power supply, and connects the wing blank to the positive terminal of the power supply. Step 5) involves a high-pressure, high-speed electrolyte flowing into the processing area and covering the entire surface of the mold with the shrouded blade, Step 6) involves starting the power supply, driving the ventral wing drive unit and the ventral wing cathode body, and the dorsal wing drive unit and the dorsal wing cathode body, respectively, by the Y1 axis and Y2 axis of the machine tool, and gradually approaching the wing body while being moved toward each other at a predetermined speed, thereby gradually forming the wing body mold surface through electrochemical action, When the wing body mold surface is machined to a predetermined depth, the wing ventral through-axis linear motor (1) and the wing dorsal through-axis linear motor (9) are started synchronously, and the linear motion through-axis pushes the shroud edge plate cathodes and dovetail edge plate cathodes on both sides via the push rod (30), first connecting rod (31), and second connecting rod (37), generating an outward expansion motion. This processes the wing body mold surface and simultaneously generates in-situ oscillating deformation in which the edge plate cathodes on both sides approach the wing's side edge plate mold surfaces, i.e., the entire mold surface of the wing body and both side edge plates has a feed component (step 7). When the Y1 and Y2 axes of the machine tool are moved to the final machining position, the spindle of the machine tool, the ventral-side through-axis linear motor (1), and the dorsal-side through-axis linear motor (9) of the machine tool stop simultaneously, completing the synchronous electrolytic machining of the entire surface of the wing body and both side edge plates of the shrouded wing, thus ending the machining process (step 8). A method characterized by including step 9) turning off the power and stopping the liquid supply from the electrolyte pump.

8. A method for using an electrolytic machining apparatus for the entire mold surface of a shrouded blade by in-situ deformation of an integrated cathode as described in claim 7, characterized in that a new mode of multi-channel coordinated liquid supply for the entire mold surface is used, namely, a plurality of electrolyte channels are provided on both side edge plates and the blade body portion of the shrouded blade (19), the plurality of electrolyte channels coordinately supply liquid during machining, the flow field covers the entire mold surface of the shrouded blade (19), improving the stability and reachability of the flow field, and at the same time, the flow field mode divides the machining area into a plurality of small flow areas, improving the uniformity of the flow field and the cleaning action.

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