Segmented synchronous electrolytic machining device and method for leading / trailing edge of blade having large torsion angle

Abstract

A segmented synchronous electrolytic machining device and method for a leading / trailing edge of a blade having a large torsion angle. A leading / trailing edge of a blade having a large torsion angle is divided along a specific section into two segments having a relatively small torsion angle, and two cathodes are respectively designed, such that the two cathodes with different feeding directions perform segmented synchronous electrolytic machining on the leading / trailing edge of the blade having a large torsion angle. The device comprises a segmented synchronous feeding mechanism, a blade-tip-side tool cathode (16) and a blade-root-side tool cathode (15), wherein the segmented synchronous feeding mechanism is mounted on a machine tool spindle, and by means of a pair of wedge mechanisms, single-direction feeding of the spindle can be converted into synchronous cross feeding of the two tool cathodes (15; 16); and the two tool cathodes (15; 16) are mounted at the front end of the segmented synchronous feeding mechanism. A main electrolytic-solution inlet and an auxiliary electrolytic-solution inlet are respectively provided in the upper side and the lower side of a cathode housing, and form an open electrolytic-solution field with a blade (12).

Description

Segmented synchronous electrochemical machining device and method for large torsion angle blade inlet / outlet edge TECHNICAL FIELD

[0001] The present application belongs to the technical field of electrochemical machining, and particularly relates to a segmented synchronous electrochemical machining device and method for large torsion angle blade inlet / outlet edge. BACKGROUND

[0002] Blades are one of the key components of modern aero-engines. New aero-engine blades often adopt more and more complex structural forms such as wide chord and swept-curved airfoils, and the number of blades, the large curvature variation of the profile, the end bending and the sweepback all require higher and higher geometric precision and comprehensive quality, especially the size precision and geometric shape of the blade inlet / outlet edge, which makes the forming machining and surface integrity guarantee more and more difficult.

[0003] The main machining methods for the inlet / outlet edge at present are milling, grinding and electrochemical machining. Milling is a machining method for removing workpiece material through a high-speed rotating milling tool. With the development of multi-axis numerical control machining technology, the application range of milling is more extensive, and it can be applied to the precision machining of the blade inlet / outlet edge with a twisted structure. However, since milling is a contact machining method, there is a macro cutting force between the tool and the workpiece, which will cause workpiece deformation and reduce machining precision when machining small size inlet / outlet edge structure. In addition, if the tool shape, machining parameters are not properly selected, or the machining trajectory is not reasonably planned, the workpiece surface will produce tool marks and micro-cracks. Grinding technology is often used for precision machining of the blade inlet / outlet edge as a precision profile modification process. The inlet / outlet edge needs to be pre-processed with a certain machining allowance in the previous process, and then the precision grinding technology is used for precision profile modification to process the inlet / outlet edge structure with high precision and high surface quality. However, the current grinding machining of the inlet / outlet edge cannot realize automatic production, and the machining efficiency needs to be further improved.

[0004] Electrochemical machining is a machining method based on the principle of electrochemical anodic dissolution of metal materials. In the machining process, the anode workpiece is connected to the positive pole of the power supply, the tool cathode is connected to the negative pole of the power supply, and a small machining gap is maintained between the two electrodes. The electrolyte flows at a high speed in the gap. Under the action of the electric field, oxidation and reduction reactions occur on the surfaces of the two electrodes. The oxidation reaction occurs on the anode, and the metal material is removed in the form of ions. The reduction reaction occurs on the cathode, and hydrogen gas is generated. In the machining process, the tool cathode is continuously fed, and the material on the workpiece surface is continuously removed, and the workpiece is gradually formed. Electrochemical machining is a non-contact machining method, which is not limited by the mechanical properties of the material, and has the characteristics of no cutting force and no cutting heat, so it has natural advantages in the machining of small size and thin wall parts, and is very suitable for the machining of the blade inlet / outlet edge.

[0005] The traditional processing method of the blade inlet / outlet edge structure is to rely on the cathode of the blade basin and the cathode of the blade back to feed in opposite directions, and to realize the forming of the inlet / outlet edge structure while processing the blade surface. However, due to the large change in curvature at the inlet / outlet edge compared with the blade surface, the electric field and flow field at the inlet / outlet edge change constantly during actual processing, which makes it difficult to ensure the processing precision. The tangential feeding electrolytic processing method of the inlet / outlet edge is to remove the processing allowance by feeding the special tool cathode of the inlet / outlet edge along the tangential direction of the blade middle arc after the surface processing is completed, so as to realize the precise processing of the inlet / outlet edge. Compared with the traditional bidirectional feeding processing method, this method has great advantages in cathode design and flow field design, and has great potential in blade inlet / outlet edge processing.

[0006] In the patent "Three-element design method of front and rear edge cathodes for precise electrolysis of aircraft engine blades" (application number 202210632192.2, applicant Jiangsu Juxi Precision Manufacturing Research Institute Co., Ltd., inventors Wang Zhongheng, He Chao, Zhao Jianshe, Zhang Changhao, Gao Wei), it is proposed to design the cathode by optimizing the three elements of the front and rear edge cathodes, to reduce the number of cathode iteration corrections and improve the processing precision of the blade front and rear edges.

[0007] In the patent "Design method of electrode for precise electrolytic processing of blade front and rear edges" (application number 201711249203.4, applicant China Aviation Engine Co., Ltd., inventors Liu Haibo, Huan Heng, Zheng Xin, Chen Dong, Zhang Yahua), the surface conductivity of the cathode at the front and rear edge electric field concentration is changed by surface treatment, to avoid the problem that the electrolytic processing precision is difficult to guarantee due to the electric field concentration and flow field disorder in the front and rear edge regions.

[0008] In the patent "Self-adaptive processing method of front and rear edges of aircraft engine turbine blades" (application number 202110678545.8, applicant Jiangsu Jianghang Zhi Fei Aircraft Engine Component Research Institute Co., Ltd., inventors Wu Jiang, Cao Chunxiao, Yan Xiaolin), by setting a number of evenly distributed follow-up mechanisms in the swing mechanism, the tool cathode and the front edge cathode one and the front edge cathode two inside are used to adaptively complete the precise electrolytic processing of the blade front and rear edges, and the processing efficiency and precision are greatly improved.

[0009] In the patent "Pulsating state electrolytic shaping device for blade or blisk inlet / outlet edge" (application number 202110617149.4, applicant Nanjing University of Aeronautics and Astronautics, inventors Zhu Di, Liu Jia, Wang Hao, Wang Jingtao), a pulsating state electrolytic processing device for tangential feeding processing along the inlet / outlet edge is proposed, which can make the processing process under the condition of much smaller than the conventional processing gap, thereby significantly improving the contour precision of the blade inlet / outlet edge.

[0010] In the patent "Precision electrolytic profile correction tool and method for blade inlet / outlet edge" (application number 202210402862.1, applicant Nanjing University of Aeronautics and Astronautics, inventors Wang Jingtao, Liu Jia, Zhu Oi, Xu Zhengyang, Wei Haodi, Wang Jing), an inlet / outlet edge tangential feed integrated cathode and an inlet / outlet edge precision profile correction method are proposed. During the machining process, the inlet / outlet edge electrolytic machining can be realized without disassembling any tooling fixture and tool setting device, which improves the automation degree of inlet / outlet edge electrolytic machining to a certain extent.

[0011] However, the current tangential feed electrolytic machining method still has defects in practical application when machining blades with relatively twisted blade profiles and large inlet / outlet edge twist angles. The current inlet / outlet edge cathode feed direction is along the angle bisector direction of the inlet / outlet edge twist angle. For blades with excessively large twist angles, the cathode machining angle of some parts of the inlet / outlet edge will be too large, which will cause the inlet / outlet edge arc to be unable to be uniformly dissolved. Therefore, in order to overcome the difficulty of high-precision electrolytic machining of large-twist-angle blade inlet / outlet edges, the present application provides a large-twist-angle blade inlet / outlet edge segmented synchronous electrolytic machining device and method. SUMMARY

[0012] The purpose of the present application is to overcome the bottleneck problem of high-precision electrolytic machining of large-twist-angle blade inlet / outlet edges, and to provide a large-twist-angle blade inlet / outlet edge segmented synchronous electrolytic machining device and method.

[0013] Specifically, the present application adopts the following scheme: a large-twist-angle blade inlet / outlet edge segmented synchronous electrolytic machining method, which is to segmentally and synchronously machine large-twist-angle blades, wherein the determination method of the segmented cross section and the feed direction of the segmented tool cathode are determined by the following steps:

[0014] Step 1. Intersect the blade three-dimensional model to obtain the tip cross-sectional profile line and the root cross-sectional profile line and project them on the same plane;

[0015] Step 2. Draw several inscribed circles in the projected profile of the tip cross-sectional profile line and the root cross-sectional profile line; and fit the centers of the inscribed circles into a central arc line respectively to form a tip cross-sectional central arc line and a root cross-sectional central arc line;

[0016] Step 3. Draw a central arc line tangent at the intersection point of the tip cross-sectional central arc line and the inlet edge to the outside of the cross-sectional profile, which is called the tip cross-sectional central arc line inlet edge tangent; draw a central arc line tangent at the intersection point of the root cross-sectional central arc line and the inlet edge to the outside of the cross-sectional profile, which is called the root cross-sectional central arc line inlet edge tangent; draw a central arc line tangent at the intersection point of the tip cross-sectional central arc line and the outlet edge to the outside of the cross-sectional profile, which is called the tip cross-sectional central arc line outlet edge tangent; draw a central arc line tangent at the intersection point of the root cross-sectional central arc line and the outlet edge to the outside of the cross-sectional profile, which is called the root cross-sectional central arc line outlet edge tangent;

[0017] Step 4. Take the angle bisector direction of the tangent of the middle camber line in the tip section and the tangent of the middle camber line in the root section as the reference direction, and take the blade profile section with the tangent direction of the middle camber line consistent with the reference direction as the segmentation surface of the inlet edge; the angle bisector direction of the tangent of the middle camber line in the tip section is the feeding direction of the tool cathode for the tip side of the inlet edge, and the angle bisector direction of the tangent of the middle camber line in the root section is the feeding direction of the tool cathode for the root side of the inlet edge.

[0018] Take the angle bisector direction of the tangent of the middle camber line in the tip section and the tangent of the middle camber line in the root section as the reference direction, and take the blade profile section with the tangent direction of the middle camber line consistent with the reference direction as the segmentation surface of the outlet edge; the angle bisector direction of the tangent of the middle camber line in the tip section is the feeding direction of the tool cathode for the tip side of the outlet edge, and the angle bisector direction of the tangent of the middle camber line in the root section is the feeding direction of the tool cathode for the root side of the outlet edge.

[0019] Further, in the above-mentioned large-torsion-angle blade inlet / outlet edge segmentation synchronous electrochemical machining method, after segmentation, the tip side of the inlet edge and the root side of the inlet edge are machined simultaneously; or the tip side of the inlet edge and the root side of the outlet edge are machined simultaneously.

[0020] Secondly, the application further provides a device that can be used in the above-mentioned large-torsion-angle blade inlet / outlet edge segmentation synchronous electrochemical machining method, which comprises a segmentation synchronous feeding mechanism, a root side tool cathode and a tip side tool cathode; the segmentation synchronous feeding mechanism is composed of a spindle adapter block, a root side inclined wedge mechanism and a tip side inclined wedge mechanism.

[0021] The root side inclined wedge mechanism is composed of a root side guide rail base, a root side cathode base and a root side guide rod; the root side guide rail base is fixedly installed on the machine tool platform, and the root side cathode base is installed on the root side guide rail base through a corresponding guide rail sliding block; the root side guide rod is installed in the inclined groove of the root side cathode base to form a pair of inclined wedge mechanisms, and the end face of the root side guide rod is installed on the machine tool spindle through the spindle adapter block; the root side tool cathode is installed on the corresponding root side cathode base; the angle of the root side inclined wedge mechanism is consistent with the feeding direction of the root side tool cathode for the inlet edge or the feeding direction of the root side tool cathode for the outlet edge.

[0022] The tip-side inclined wedge mechanism is composed of a tip-side guide rail base, a tip-side cathode base and a tip-side guide rod. The tip-side guide rail base is fixedly installed on the machine tool platform. The tip-side cathode base is installed on the tip-side guide rail base through corresponding guide rail sliders. The tip-side guide rod is installed in the inclined groove of the tip-side cathode base to form a pair of inclined wedge mechanisms. The end face of the tip-side guide rod is installed on the machine tool spindle through the spindle adapter block. The tip-side tool cathode is installed on the corresponding tip-side cathode base. The angle of the tip-side inclined wedge mechanism is consistent with the feeding direction of the tip-side tool cathode on the gas inlet side or the feeding direction of the tip-side tool cathode on the gas exhaust side.

[0023] Thirdly, the application provides a large-torsion-angle blade inlet / outlet edge segmented synchronous electrolytic machining method, which comprises the following machining steps:

[0024] Step one: install the segmented synchronous feeding mechanism on the machine tool, and connect the spindle adapter block with the machine tool spindle. Adjust the position of the machine tool spindle to adjust the positions of the two segmented tool cathodes, so that the two tool cathode profiles form a complete and continuous cathode profile.

[0025] Step two: install the blade blank in the clamp, measure and position, and perform tool setting, and reserve an initial machining gap between the tip-side tool cathode, the root-side tool cathode and the blade blank.

[0026] Step three: connect the blade blank with the positive pole of the power supply, and connect the tip-side tool cathode and the root-side tool cathode with the negative pole of the power supply. The machining flow field adopts a double-side liquid inlet counterflow flow field. The electrolyte is divided into four paths and flows into the machining gap from the tip-side main liquid inlet, the root-side main liquid inlet and the auxiliary liquid inlet, and flows out of the open outlet formed by the tip-side lower flow guide shell, the root-side lower flow guide shell and the blade.

[0027] Step four: during machining, the machine tool spindle drives the tip-side guide rod and the root-side guide rod to feed in the horizontal direction. The inclined wedge mechanism formed by the tip-side guide rod and the tip-side cathode base converts the feeding of the tip-side guide rod in the horizontal direction into the feeding of the tip-side cathode base in the direction of the inclination angle of the tip-side guide rail base, thereby driving the tip-side tool cathode to approach the inlet / outlet edge. The inclined wedge mechanism formed by the root-side guide rod and the root-side cathode base converts the feeding of the root-side guide rod in the horizontal direction into the feeding of the root-side cathode base in the direction of the inclination angle of the root-side guide rail base, thereby driving the root-side tool cathode to approach the inlet / outlet edge. Under the synchronous movement of the tip-side tool cathode and the root-side tool cathode and the electrochemical dissolution, the inlet / outlet edge is synchronously formed.

[0028] Step five: turn off the power supply, the electrolyte circulation system and the machine tool.

[0029] Compared with the prior art, the application has the following obvious features:

[0030] (1) The embodiment of the present application proposes a tangential electrochemical machining method for large torsion angle blade inlet / outlet edges. The large torsion angle blade inlet / outlet edges are divided into two segments along a certain cross section to reduce the torsion angle of each segment of the inlet / outlet edges, and then the two segments of the blade inlet / outlet edges are machined simultaneously by tangential electrochemical machining. This segmented synchronous electrochemical machining method for blade inlet / outlet edges effectively solves the problem that when machining the large torsion angle blade inlet / outlet edges by tangential machining, the angle between the feed direction and the tangent direction of the arc in the cross section profile is too large due to the large torsion angle, which further leads to the problem that the size deviation of the machined inlet / outlet edges is too large.

[0031] (2) The embodiment of the present application designs a segmented synchronous electrochemical machining device for large torsion angle blade inlet / outlet edges. The linear motion of a single motion axis directly drives the two inlet / outlet edge tool cathodes to move synchronously in a certain angle direction, and the synchronization and consistency of the feed of the two tool cathodes are guaranteed, which can better complete the segmented synchronous machining of the large torsion angle blade inlet / outlet edges.

[0032] (3) The tangential electrochemical machining method for large torsion angle blade inlet / outlet edges disclosed in the embodiment of the present application has wide application range and high machining flexibility. For the inlet / outlet edges of integral blade discs, diffuser blade inlet / outlet edges and other parts, the inlet / outlet edge tool cathodes can be designed and machined accordingly. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a schematic diagram of a segmented synchronous feed electrochemical machining device;

[0034] Fig. 2 is a partial cross-sectional view of the segmented synchronous feed electrochemical machining device;

[0035] Fig. 3 is a schematic diagram of an inlet / outlet edge segmented synchronous feed cathode;

[0036] Fig. 4 is a schematic diagram of a blade inlet / outlet edge division surface;

[0037] Fig. 5 is a schematic diagram of the tangent of the arc in each cross section and the feed direction;

[0038] Fig. 6 is a schematic diagram of the feed direction of each segmented synchronous feed machining cathode;

[0039] Figure label name: 1, blade root side guide rail base, 2, guide rail slider, 3, blade root side cathode base, 4, blade root side guide rod, 5, blade tip side guide rail base, 6, main shaft adapter block, 7, blade tip side guide rod, 8, blade tip side cathode base, 9, blade tip side cathode upper flow guide shell, 10, blade root side cathode upper flow guide shell, 11, blade tip side cathode lower flow guide shell, 12, blade, 13, blade root side cathode lower flow guide shell, 14, cathode insulating block, 15, blade root side tool cathode, 16, blade tip side tool cathode, 17, blade tip cross-sectional profile line, 18, segmented synchronous processing segmentation surface, 19, segmentation surface cross-sectional profile line, 20, blade root cross-sectional profile line. DETAILED DESCRIPTION

[0040] The technical solutions of the present application are further described below in conjunction with the drawings.

[0041] As shown in FIG. 1 and FIG. 2, the segmented synchronous feeding mechanism includes a blade root side wedge mechanism, a blade tip side wedge mechanism, and a spindle adapter 6. The two wedge mechanisms mainly include: blade tip side guide rods 7 with opposite inclination angles, blade root side guide rods 4, blade tip side cathode bases 8 with slits corresponding to the inclination angles of the guide rods, blade root side cathode bases 3, two pairs of guide rail sliders 2 (only one pair is shown in the figure), and blade tip side guide rail bases 5 and blade root side guide rail bases 1 with opposite end face inclination angles. When installed, the guide rail bases 1 and 5 are fixedly installed on the machine tool platform, the cathode bases 3 and 8 are installed on the guide rail bases 1 and 5 through the guide rail sliders, respectively, the blade root side guide rods 4 and the blade tip side guide rods 7 are installed in the slits on the blade root side cathode bases 3 and the blade tip side cathode bases 8, respectively, forming wedge mechanisms, and the bottom of the blade root side guide rods 4 and the blade tip side guide rods 7 are installed on the machine tool spindle through the spindle adapter 6. The inlet / outlet edge tool cathode includes blade root side inlet / outlet edge tool cathode 15 and blade tip side inlet / outlet edge tool cathode 16. Each tool cathode includes a tool cathode body, a cathode insulation block, an upper flow guide shell with a main liquid inlet, a lower flow guide shell with an auxiliary liquid inlet, and several other parts. The upper and lower flow guide shells and the cathode insulation block are directly installed on the tool cathode body, and do not need to be frequently disassembled during machining. The blade root side inlet / outlet edge tool cathode 15 and the blade tip side inlet / outlet edge tool cathode 16 are installed on the blade root side cathode base 3 and the blade tip side cathode base 8, respectively, to form a complete segmented synchronous electrolytic machining device. During machining, the machine tool spindle simultaneously pushes the blade root side guide rods 4 and the blade tip side guide rods 7 to feed in the horizontal direction, and a pair of wedge mechanisms formed by the blade root side guide rods 4, the blade tip side guide rods 7, the blade root side cathode base 3, and the blade tip side cathode base 8 convert the horizontal feeding of the guide rods into the feeding of the blade root side cathode base 3 and the blade tip side cathode base 8 in the direction of the inclination angle of the respective guide rail bases, thereby driving the blade root side inlet / outlet edge tool cathode 15 and the blade tip side inlet / outlet edge tool cathode 16 to synchronously feed and machine the inlet / outlet edge. During machining, the flow field adopts a double-sided inlet liquid opposing flow field, and the electrolyte is divided into four paths and flows into the machining gap from the main liquid inlets and auxiliary liquid inlets of the blade root side upper flow guide shell 10 and the blade tip side upper flow guide shell 9, flows through the inlet / outlet edge of the blade blank 12, and freely flows out of the open outlet formed by the blade root side lower flow guide shell 13 and the blade tip side lower flow guide shell 11 and the blade 14.

[0042] As shown in FIG. 4 and FIG. 5, the feeding direction of the inlet / outlet edge tool cathode and the method for determining the blade inlet / outlet edge section include the following steps:

[0043] Step S1: In the three-dimensional model of the blade, the blade tip section contour line 17 and the blade root section contour line 20 are cut and projected on the same plane, and a plurality of inscribed circles are drawn in the two section contours, respectively, and the centers of all the inscribed circles are fitted into a median arc line.

[0044] Step S2: draw a camber line tangent at the intersection of the camber line and the inlet / outlet edge side of the section profile, and take the direction of the angle bisector of the camber line tangent of the tip section and the root section as the reference direction.

[0045] Step S3: take the section profile of the blade with the camber line tangent direction consistent with the reference direction as the division surface 18 of the inlet / outlet edge side, and take the direction of the angle bisector of the camber line tangent direction of the tip section profile as the feeding direction 1 of the tip side tool cathode 16 of the inlet / outlet edge side, and take the direction of the angle bisector of the camber line tangent direction of the root section profile as the feeding direction 2 of the root side tool cathode 15 of the inlet / outlet edge side.

[0046] As shown in FIG. 1 and FIG. 6, the large torsion angle blade inlet / outlet edge section synchronous electrochemical machining method of the present application comprises the following machining steps:

[0047] Step one: install the section synchronous feeding mechanism on the machine tool, and connect the spindle adapter block 6 with the machine tool spindle; adjust the position of the machine tool spindle to further adjust the positions of the two section tool cathodes, so that the two tool cathode profiles form a complete continuous cathode profile;

[0048] Step two: install the blade blank 12 in the clamp, measure and position, and perform tool setting, and leave an initial machining gap between the tip side tool cathode 16, the root side tool cathode 15 and the blade blank 12;

[0049] Step three: connect the blade blank 12 with the positive pole of the power supply, and connect the tip side tool cathode 16 and the root side tool cathode 15 with the negative pole of the power supply; the flow field form of machining adopts a double-sided liquid inlet counter-flow flow field, and the electrolyte is divided into four paths and flows into the machining gap from the tip side main liquid inlet, the root side main liquid inlet and the auxiliary liquid inlet, and flows through the inlet / outlet edge and freely flows out from the open outlet formed by the tip side lower flow guide shell 11, the root side lower flow guide shell 12 and the blade;

[0050] Step four: during machining, the machine tool spindle pushes the tip side guide rod 7 and the root side guide rod 4 to simultaneously feed in the horizontal direction; the inclined wedge mechanism formed by the tip side guide rod 7 and the tip side cathode base 8 converts the feeding of the tip side guide rod 7 in the horizontal direction into the feeding of the tip side cathode base 8 in the direction of the inclination angle of the tip side guide rail base 5, thereby driving the tip side tool cathode 16 to approach the inlet / outlet edge; the inclined wedge mechanism formed by the root side guide rod 4 and the root side cathode base 3 converts the feeding of the root side guide rod 4 in the horizontal direction into the feeding of the root side cathode base 3 in the direction of the inclination angle of the root side guide rail base 1, thereby driving the root side tool cathode 15 to approach the inlet / outlet edge; under the synchronous movement of the tip side tool cathode 16 and the root side tool cathode 15 and the electrochemical dissolution, the inlet / outlet edge is synchronously formed;

[0051] Step five: Turn off the power, electrolyte circulation system, and machine.

Claims

1. A large torsion angle blade inlet / outlet edge segmented synchronous electrochemical machining method, characterized in that: the large torsion angle blade is segmented and synchronously machined, wherein the determination mode of the segmented section and the feeding direction of the tool cathode after segmentation are determined by the following ways: Step 1. The tip section profile line (17) and the root section profile line (20) are cut on the three-dimensional model of the blade and projected on the same plane; Step 2. A plurality of inscribed circles are drawn in the projected profiles of the tip section profile line (17) and the root section profile line (20), respectively; and the centers of the inscribed circles are fitted into a median arc line, respectively, to form a tip section median arc line and a root section median arc line; Step 3. A median arc line tangent is made outside the section profile at the intersection of the tip section median arc line and the inlet edge, which is called the tip section median arc line inlet edge tangent; a median arc line tangent is made outside the section profile at the intersection of the root section median arc line and the inlet edge, which is called the root section median arc line inlet edge tangent; a median arc line tangent is made outside the section profile at the intersection of the tip section median arc line and the outlet edge, which is called the tip section median arc line outlet edge tangent; a median arc line tangent is made outside the section profile at the intersection of the root section median arc line and the outlet edge, which is called the root section median arc line outlet edge tangent; Step 4. The section of the blade profile whose median arc line tangent direction is consistent with the reference direction is taken as the division surface of the inlet edge, with the reference direction being the angle bisector direction of the tip section median arc line inlet edge tangent and the root section median arc line inlet edge tangent; the reference direction and the angle bisector direction of the tip section median arc line inlet edge tangent are the feeding direction of the tool cathode on the tip side of the inlet edge, and the reference direction and the angle bisector direction of the root section median arc line inlet edge tangent are the feeding direction of the tool cathode on the root side of the inlet edge; The section of the blade profile whose median arc line tangent direction is consistent with the reference direction is taken as the division surface of the outlet edge, with the reference direction being the angle bisector direction of the tip section median arc line outlet edge tangent and the root section median arc line outlet edge tangent; the reference direction and the angle bisector direction of the tip section median arc line outlet edge tangent are the feeding direction of the tool cathode on the tip side of the outlet edge, and the reference direction and the angle bisector direction of the root section median arc line outlet edge tangent are the feeding direction of the tool cathode on the root side of the outlet edge.

2. The large torsion angle blade inlet / outlet edge segmented synchronous electrochemical machining method according to claim 1, characterized in that: after segmentation, the tip side of the inlet edge and the root side of the inlet edge are machined simultaneously; or the tip side of the inlet edge and the root side of the outlet edge are machined simultaneously.

3. An apparatus for performing the method of claim 2, wherein the apparatus is characterized by: It includes a segmented synchronous feeding mechanism, a root side tool cathode (15), and a tip side tool cathode (16); the segmented synchronous feeding mechanism is composed of a main shaft adapter block (6) and a root side inclined wedge mechanism and a tip side inclined wedge mechanism. The blade root side wedge mechanism is composed of a blade root side guide rail base (1), a blade root side cathode base (3), and a blade root side guide rod (4). The blade root side guide rail base (1) is fixedly installed on the machine tool platform, and the blade root side cathode base (3) is installed on the blade root side guide rail base (1) through corresponding guide rail sliders. The blade root side guide rod (4) is installed in the inclined groove of the blade root side cathode base (3) to form a pair of wedge mechanisms. The end face of the blade root side guide rod (4) is installed on the machine tool spindle through a spindle adapter block (6). The blade root side tool cathode (15) is installed on the corresponding blade root side cathode base (3). The angle of the blade root side wedge mechanism is consistent with the feeding direction of the blade root side tool cathode on the gas inlet side or the feeding direction of the blade root side tool cathode on the gas exhaust side. The blade tip side wedge mechanism is composed of a blade tip side guide rail base (5), a blade tip side cathode base (8), and a blade tip side guide rod (7). The blade tip side guide rail base (5) is fixedly installed on the machine tool platform, and the blade tip side cathode base (8) is installed on the blade tip side guide rail base (5) through corresponding guide rail sliders. The blade tip side guide rod (7) is installed in the inclined groove of the blade tip side cathode base (8) to form a pair of wedge mechanisms. The end face of the blade tip side guide rod (7) is installed on the machine tool spindle through a spindle adapter block (6). The blade tip side tool cathode (16) is installed on the corresponding blade tip side cathode base (8). The angle of the blade tip side wedge mechanism is consistent with the feeding direction of the blade tip side tool cathode on the gas inlet side or the feeding direction of the blade tip side tool cathode on the gas exhaust side.

4. A method of processing using the large torsion angle blade inlet / outlet edge segmented synchronous electrolytic device according to claim 3, characterized in that The method comprises the following steps: Step one: install the segmented synchronous feeding mechanism on the machine tool, and connect the spindle adapter block (6) with the machine tool spindle. Adjust the position of the machine tool spindle to adjust the positions of the two segmented tool cathodes, so that the two tool cathode profiles form a complete and continuous cathode profile. Step two: install the blade blank (12) in the clamp, measure and position, and perform tool setting, and leave an initial machining gap between the blade tip side tool cathode (16), the blade root side tool cathode (15), and the blade blank (12). Step three: connect the blade blank (12) with the positive pole of the power supply, and connect the blade tip side tool cathode (16) and the blade root side tool cathode (15) with the negative pole of the power supply. The processed flow field adopts a double-sided liquid inlet counterflow flow field. The electrolyte is divided into four paths and flows into the machining gap from the blade tip side main liquid inlet, the blade root side main liquid inlet, and the auxiliary liquid inlet, and flows through the inlet / exhaust edges and freely flows out from the open outlet formed by the blade tip side lower flow guide shell (11), the blade root side lower flow guide shell (12), and the blade. Step four: when processing, the machine tool spindle pushes the tip side guide rod (7) and the root side guide rod (4) to feed in the horizontal direction at the same time; the inclined wedge mechanism formed by the tip side guide rod (7) and the tip side cathode base (8) converts the feeding of the tip side guide rod (7) in the horizontal direction into the feeding of the tip side cathode base (8) in the direction of the inclination angle of the tip side guide rail base (5), and then drives the tip side tool cathode (16) to move close to the inlet / outlet gas side; the inclined wedge mechanism formed by the root side guide rod (4) and the root side cathode base (3) converts the feeding of the root side guide rod (4) in the horizontal direction into the feeding of the root side cathode base (3) in the direction of the inclination angle of the root side guide rail base (1), and then drives the root side tool cathode (15) to move close to the inlet / outlet gas side; under the synchronous movement of the tip side tool cathode (16) and the root side tool cathode (15) and the electrochemical dissolution effect, the inlet / outlet gas side is formed synchronously; Step five: turn off the power supply, the electrolyte circulation system and the machine tool.

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