Electrochemical machining device with side flow and cassette type cavity sealing and electrochemical machining method

Abstract

The application discloses a kind of side flow type electrolytic machining device and electrolytic machining method of machine cavity closure, and electrolytic machining machine tool includes machine tool rotary table and machine tool spindle, and electrolytic machining device includes: clamping component, for clamping machine case workpiece and make machine case workpiece fixed to machine tool rotary table, machine tool rotary table connects power supply anode;Cathode component is connected with machine tool spindle and is arranged in the radial direction of machine case in one side of machine case to form processing gap between the outer surface of machine case, and machine tool spindle connects power supply cathode;Sealing assembly, including sealing sleeve and pressing mechanism, sealing sleeve has inner cavity, liquid inlet and liquid outlet respectively located in the two sides of sealing assembly and respectively communicated with inner cavity, sealing assembly is sleeved on cathode component to make the processing end of cathode component be located in inner cavity, and pressing mechanism is used to make sealing assembly keep tight sealing in the outer surface of machine case to close inner cavity, and liquid inlet is used to introduce electrolyte to flow through processing gap and be discharged through liquid outlet.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical machining of aircraft engine casings, and in particular to a side-flow electrochemical machining device with a closed casing cavity. Furthermore, the present invention also relates to an electrochemical machining method comprising the side-flow electrochemical machining device with a closed casing cavity. Background Art

[0002] The casing is a critical component of aircraft engines. It's primarily constructed from difficult-to-cut materials like nickel-based high-temperature alloys, and features numerous lightened cavities with depths ranging from 1mm to 5mm. Currently, five-axis CNC milling is the primary method for machining these cavities, but this suffers from severe tool wear, high costs, and low machining efficiency, making it difficult to meet the demands of mass production. Electrochemical machining (ECM) utilizes the principle of electrochemical anodic dissolution of metals to shape workpieces. Compared to other machining methods, ECM offers the following advantages: theoretically, no tool cathode wear and can be used endlessly; high machining efficiency; excellent surface quality; and non-contact machining, which introduces no cutting stress, making it ideal for machining casing cavities.

[0003] For this type of casing parts with cavities, the most commonly used process is copy electrochemical machining technology. The parts are fixed and the cathode is continuously fed along the normal direction of the cavity. Under the action of electrochemistry, the casing surface material is continuously dissolved and the cavity is gradually processed and formed. Due to the large size of the casing, setting up a fully enclosed flow field requires a special extremely large sealing device, which is very expensive. Figure 1 Currently, an open positive flow field is mostly used. The electrolyte flows from the internal channel of the cathode into the processing gap between the casing and the cathode, and then flows out in a divergent manner and directly flows into the recovery pipe of the machine tool processing cavity. This open flow field fixture has a simple structure and is easy to operate, but it faces the following problems in actual production: there is a liquid groove on the cathode working surface, and some bosses will remain on the surface of the part after electrolytic processing, requiring additional polishing to remove the bosses; the flow field parameters such as flow velocity and pressure in the open flow field are very unevenly distributed in the processing gap, with great differences in different places. The flow direction of the electrolyte is uncontrollable, and liquid shortage is very likely to occur. The stability is poor, and the conductivity is unevenly distributed, resulting in different processing speeds in different places, poor processing accuracy, obvious flow lines on the casing surface, and the electrolyte diverges everywhere. The inner wall of the machine tool processing cavity is often washed by the electrolyte, which causes great corrosion to the inner wall of the machine tool. Summary of the Invention

[0004] The present invention provides a side-flow electrolytic machining device and an electrolytic machining method with a closed casing cavity, so as to solve the technical problems of uneven machining gap distribution and residual bosses requiring polishing caused by open flow field machining of casing workpieces.

[0005] According to one aspect of the present invention, there is provided

[0006] A side flow type electrolytic machining device with a cartridge cavity closed, applied to an electrolytic machining machine tool, the electrolytic machining machine tool comprising a machine tool rotary table and a machine tool spindle, the electrolytic machining device comprising:

[0007] A clamping assembly for clamping the cartridge workpiece and fixing the cartridge workpiece to the machine tool rotary table, the machine tool rotary table being connected to the positive pole of the power supply;

[0008] A cathode assembly connected to the machine tool spindle and arranged on one side of the cartridge along the radial direction of the cartridge to form a machining gap between the outer surface of the cartridge, the machine tool spindle being connected to the negative pole of the power supply;

[0009] A sealing assembly comprising a sealing sleeve and a pressing mechanism, the sealing sleeve having an inner cavity, a liquid inlet and a liquid outlet respectively located on both sides of the sealing assembly and respectively communicating with the inner cavity, the sealing assembly being sleeved on the cathode assembly so that the machining end of the cathode assembly is located in the inner cavity, the pressing mechanism being used to keep the sealing assembly tightly sealed on the outer surface of the cartridge to close the inner cavity, the liquid inlet being used to introduce the electrolyte to flow through the machining gap and be discharged through the liquid outlet.

[0010] As a further improvement of the above technical solution, the clamping assembly comprises an electrically conductive plate, a pressing plate, a stud and a first locking nut, the electrically conductive plate and the stud being respectively connected to the machine tool rotary table, the electrically conductive plate being provided with a boss structure for radial positioning of the cartridge, the pressing plate being arranged at the end of the cartridge workpiece away from the electrically conductive plate, the stud being threaded through the pressing plate, and the first locking nut being used to connect to the stud to lock the pressing plate and thereby fasten the cartridge workpiece to the electrically conductive plate.

[0011] As a further improvement of the above technical solution, the cathode assembly comprises a mounting plate connected to the machine tool spindle and a positioning plate connected to the mounting plate through a stand, the positioning plate being provided with a positioning seat for mounting a main cathode.

[0012] As a further improvement of the above technical solution, the pressing mechanism comprises a positioning rod arranged in the direction of the machine tool spindle, a first end of the positioning rod being connected to the positioning plate, a second end of the positioning rod being threadedly connected to a limiting plate, the positioning rod being sleeved with a limiting sleeve located between the positioning plate and the limiting plate, an elastic member being arranged between the limiting sleeve and the positioning plate, the elastic member being used to provide elastic force to the limiting plate acting on the sealing sleeve in the compressed state, thereby tightly sealing the sealing sleeve to the cartridge workpiece.

[0013] As a further improvement of the above technical solution, the positioning rod comprises a first threaded section at the first end, a second threaded section at the second end, and a positioning section between the first threaded section and the second threaded section, the diameter of the positioning section being greater than the diameter of the first threaded section and the diameter of the second threaded section, the first threaded section being threaded through the positioning plate and abutting against the positioning section to the positioning plate, the second threaded section being threaded with the limiting plate, and the second threaded section being threaded with the adjusting nut to limit the axial connection position of the second threaded section and the limiting plate.

[0014] As a further improvement of the above technical solution, the sealing assembly further comprises a first sealing structure arranged between the sealing sleeve and the cathode assembly, and a second sealing structure arranged on the side of the sealing sleeve facing the matching end face of the cartridge.

[0015] As a further improvement of the above technical solution, the first sealing structure comprises a first mounting groove opened in the inner side of the sealing sleeve or the outer side of the cathode assembly, and a first sealing ring embedded in the first mounting groove, and the second sealing structure comprises a second mounting groove opened in the matching end face, and a second sealing ring embedded in the second mounting groove.

[0016] As a further improvement of the above technical solution, the sealing sleeve is provided with a flow guide structure to guide the electrolyte flowing into the inlet to the machining gap and guide the electrolyte flowing out of the machining gap to the outlet.

[0017] As a further improvement of the above technical solution, the machining end of the cathode assembly matches the curvature of the outer surface of the cartridge workpiece, and the matching end face of the sealing sleeve facing the cartridge workpiece matches the curvature of the cartridge workpiece.

[0018] According to another aspect of the present application, there is also provided an electrolytic machining method, which comprises the side-flow type electrolytic machining device with cartridge cavity sealing as described above, comprising:

[0019] S1. Installing the cartridge workpiece;

[0020] S2. Installing the cathode assembly;

[0021] S3. Installing the sealing assembly;

[0022] S4. The machine tool is connected to the power supply, the machine tool spindle is connected to the negative pole of the power supply, the machine tool turntable is connected to the positive pole of the power supply, and the sealing sleeve is pressed tightly to the outer surface of the cartridge workpiece by the pressing mechanism;

[0023] S5. The electrolyte is introduced to flow into the inner cavity through the inlet, flow through the machining gap, and be discharged through the outlet;

[0024] S6. The machine tool is powered on, the machining parameters are set, the machining is started, the main cathode is continuously fed, and the sealing assembly is kept in tight sealing with the outer surface of the machine case under the action of the pressing mechanism;

[0025] S7. After the machining of the current cavity is completed, the rotary table is rotated to adjust the circumferential position of the machine case workpiece, and steps S4-S6 are repeated until the machining of all cavities of the machine case workpiece is completed.

[0026] The present application has the following beneficial effects:

[0027] The electrolytic machining device fixes the machine case workpiece to the rotary table of the machine tool through the clamping assembly and connects the positive electrode of the power supply, the cathode assembly is connected to the main shaft of the machine tool and connected to the negative electrode of the power supply, and the cathode assembly is controlled by the main shaft of the machine tool to feed along the radial direction of the machine case workpiece during machining to maintain the machining gap; the sealing sleeve is sleeved on the cathode assembly and kept in sealing cooperation with the outer surface of the machine case workpiece by the pressing mechanism, and the sealing sleeve is always kept in tight sealing with the outer surface of the machine case workpiece under the action of the pressing mechanism during machining to keep the inner cavity closed, realize the electrolytic machining of the machine case cavity under the condition of closed flow field, and the electrolyte flows into through the inlet, flows through the machining gap and then flows out through the outlet, the electrolyte in the machining gap is more full and uniformly distributed, the machining stability is improved, the flow lines are eliminated, and the problems of uneven electrolyte flow field, lack of electrolyte, residual boss and poor machining precision in the open positive flow electrolytic machining in the prior art are avoided, the surface roughness of the machine case cavity machined by the device is high, there is no residual boss, and the machining precision is further improved. At the same time, electrolyte splashing is avoided, the corrosion of the inner wall of the machine tool is reduced, and the service life of the equipment is improved; after the machining of the part of the cavity of the machine case is completed, the main shaft of the machine tool is retracted to make the cathode assembly and the sealing sleeve disengage from the cooperation with the machine case workpiece, and the machining of other cavities of the machine case is completed after the circumferential rotation of the machine case workpiece is controlled by the rotary table of the machine tool.

[0028] In addition to the objects, features, and advantages described above, the present application has other objects, features, and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings that form a part of this application are intended to provide a further understanding of the application, and the illustrative embodiments thereof, and are not intended to limit the application. In the drawings:

[0030] Figure 1 is a schematic diagram of the open positive flow field of the prior art;

[0031] Figure 2 is a schematic diagram of the structure of the preferred embodiment of the present application;

[0032] Figure 3 is a schematic diagram of the closed side flow field of the preferred embodiment of the present application;

[0033] Figure 4 is a workpiece clamping sectional view of a preferred embodiment of the present application;

[0034] Figure 5 is a schematic diagram of a machine housing workpiece structure of a preferred embodiment of the present application.

[0035] Legend:

[0036] 1, stud; 2, first locking nut; 3, pressing plate; 4, conductive plate; 5, machine housing workpiece; 6, sealing sleeve; 7, adjusting nut; 8, limiting plate; 9, limiting sleeve; 10, elastic member; 11, positioning rod; 12, positioning plate; 13, second locking nut; 14, vertical column; 15, mounting plate; 16, liquid outlet; 17, liquid inlet; 18, first sealing ring; 19, second sealing ring; 20, main cathode; 21, screw; 22, positioning seat; 23, cavity. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0038] Figure 2 is a schematic diagram of a structure of a preferred embodiment of the present application; Figure 3 is a schematic diagram of a closed side flow type flow field of a preferred embodiment of the present application; Figure 5 is a workpiece clamping sectional view of a preferred embodiment of the present application.

[0039] As shown in Figures 2 to 5 , the machine housing cavity closed side flow type electrochemical machining device of the present embodiment is applied to an electrochemical machining machine tool, which includes a machine tool rotary table and a machine tool spindle, and the electrochemical machining device includes:

[0040] a clamping assembly for clamping the machine housing workpiece 5 and fixing the machine housing workpiece 5 to the machine tool rotary table, the machine tool rotary table being connected to the positive pole of the power supply;

[0041] a cathode assembly connected to the machine tool spindle and arranged on one side of the machine housing in the radial direction of the machine housing to form a machining gap between the cathode assembly and the outer surface of the machine housing, the machine tool spindle being connected to the negative pole of the power supply;

[0042] a sealing assembly including a sealing sleeve 6 and a pressing mechanism, the sealing sleeve 6 having an inner cavity, a liquid inlet 17 and a liquid outlet 16 respectively located on both sides of the sealing assembly and respectively communicating with the inner cavity, the sealing assembly being sleeved on the cathode assembly so that the machining end of the cathode assembly is located in the inner cavity, the pressing mechanism being used to keep the sealing assembly tightly sealed on the outer surface of the machine housing to close the inner cavity, and the liquid inlet 17 being used to introduce the electrolyte to flow through the machining gap and be discharged through the liquid outlet 16.

[0043] In the present embodiment, the cathode assembly can be a solid cathode without a liquid passage groove.

[0044] It can be understood that the electrolytic machining device fixes the machine case workpiece 5 to the machine tool rotary table through the clamping assembly and connects the positive electrode of the power supply, the cathode assembly is connected to the machine tool spindle and connected to the negative electrode of the power supply, and the cathode assembly is controlled by the machine tool spindle to feed along the radial direction of the machine case workpiece 5 during the machining process to maintain the machining gap; the sealing sleeve 6 is sleeved on the cathode assembly and is pressed by the pressing mechanism to maintain sealing cooperation with the outer surface of the machine case workpiece 5, that is, the sealing sleeve 6 is always pressed and sealed on the outer surface of the machine case workpiece 5 under the action of the pressing mechanism during the machining process, the inner cavity is kept closed, and the machine case cavity electrolytic machining under closed flow field conditions is realized. The electrolyte flows into the liquid inlet 17, then flows through the machining gap, and then flows out through the liquid outlet 16. The electrolyte in the machining gap is more full and uniformly distributed, improving the machining stability and eliminating flow lines. The problems of uneven electrolyte flow field, lack of electrolyte, residual boss, poor machining precision and other problems in the prior art are avoided. The surface roughness of the machine case cavity machined by the device is high, there is no residual boss, the machining precision is further improved, and the polishing process is not required. At the same time, electrolyte splashing is avoided, the corrosion of the inner wall of the machine tool is reduced, and the service life of the equipment is improved. After the machining of the machine case part cavity is completed, the machine tool spindle is retracted to make the cathode assembly and the sealing sleeve 6 disengage from the machine case workpiece 5. After the machine case workpiece 5 is rotated by the machine tool rotary table, the machining of other machine case cavities is completed.

[0045] In this embodiment, the clamping assembly includes the conductive plate 4, the pressing plate 3, the stud 1, and the first locking nut 2. The conductive plate 4 and the stud 1 are respectively connected to the machine tool rotary table. The conductive plate 4 is provided with a boss structure for radial positioning of the machine case to ensure that the roundness of the machine case workpiece 5 meets the machining requirements. The pressing plate 3 is arranged at one end of the machine case workpiece 5 away from the conductive plate 4. The pressing plate 3 is made of insulating material. The stud 1 is arranged in the pressing plate 3. The first locking nut 2 is used to connect to the stud 1 to lock the pressing plate 3 and then fasten the machine case workpiece 5 on the conductive plate 4. The positioning and clamping of the cathode assembly and the conduction are realized through the clamping assembly.

[0046] In this embodiment, the cathode assembly includes the mounting plate 15 connected to the machine tool spindle and the positioning plate 12 connected to the mounting plate 15 through the stand column 14. The positioning plate 12 is provided with a positioning seat 22 for mounting the main cathode 20. By selecting different lengths of the stand column 14, the installation position of the cathode assembly can be matched with the size of the machine case workpiece 5.

[0047] In the embodiment, the pressing mechanism comprises a positioning rod 11 arranged along the direction of the main shaft of the machine tool, a first end of the positioning rod 11 is connected to a positioning plate 12, a second end of the positioning rod 11 is threadedly connected to a limiting plate 8, the positioning rod 11 is sleeved with a limiting sleeve 9 located between the positioning plate 12 and the limiting plate 8, an elastic member 10 is arranged between the limiting sleeve 9 and the positioning plate 12, the elastic member 10 is used to provide elastic force in a compressed state to enable the limiting plate 8 to act on the sealing sleeve 6, so as to press the sealing sleeve 6 to be tightly sealed to the machine case workpiece 5;

[0048] In the embodiment, the positioning rod 11 comprises a first threaded section at the first end, a second threaded section at the second end, and a positioning section between the first threaded section and the second threaded section, the diameter of the positioning section is greater than the diameter of the first threaded section and the diameter of the second threaded section, the first threaded section is arranged through the positioning plate 12 and is threadedly connected to the positioning section to abut against the positioning plate 12, the second threaded section is threadedly connected to the limiting plate 8, and the second threaded section is threadedly connected to the adjusting nut 7 to limit the axial connection position of the second threaded section and the limiting plate 8;

[0049] In the embodiment, the positioning section can be provided as a first positioning section and a second positioning section, the first positioning section is located on the side close to the first threaded section, the diameter of the first positioning section is greater than the diameter of the second positioning section, the inner diameter of the limiting sleeve 9 matches the second positioning section, one end of the limiting sleeve 9 towards the machine case workpiece is provided with a reduced diameter, so that the end portion matches the second threaded section, the elastic member 10 is a spring sleeved on the second threaded section and located inside the limiting sleeve 9, the two ends of the elastic member 10 respectively abut against the end portion of the second positioning section and the inner end of the limiting sleeve, the diameter of the second positioning section matches the limiting sleeve 9, and the two ends of the first positioning section are matched with the positioning plate 12 and the end portion of the limiting sleeve 9 respectively, so that the structure is simple and compact; before processing, the position of the limiting sleeve is limited by the adjusting nut, so that the elastic member is in a compressed state when the main shaft of the machine tool is fed to match the sealing sleeve and the machine case workpiece, thereby ensuring the sealing property during processing.

[0050] In the embodiment, the sealing assembly further comprises a first sealing structure arranged between the sealing sleeve 6 and the cathode assembly, and a second sealing structure arranged on the side of the sealing sleeve 6 towards the machine case and matched with the end face, specifically, the first sealing structure comprises a first installation groove opened in the inner side of the sealing sleeve 6 or opened in the outer side of the cathode assembly, and a first sealing ring 18 embedded in the first installation groove, the second sealing structure comprises a second installation groove opened in the matched end face, and a second sealing ring 19 embedded in the second installation groove, the sealing sleeve 6 and the cathode assembly are sealed by the first sealing ring 18, the sealing sleeve 6 is pressed to the outer surface of the machine case under the action of the pressing mechanism, and sealing is realized by the second sealing ring 19 between the two;

[0051] In the embodiment, the flow guide structure is arranged in the sealing sleeve 6 to guide the electrolyte flowing into the inlet 17 to the machining gap and guide the electrolyte flowing out of the machining gap to the outlet 16. The flow guide structure is the inclined surface between the inlet 17 and the machining gap and the inclined surface between the outlet 16 and the machining gap, so that the electrolyte flowing into the inlet 17 is more likely to flow to the machining gap, and the electrolyte flowing out of the machining gap is more likely to flow to the outlet 16.

[0052] In the embodiment, the machining end of the cathode assembly matches the curvature of the outer surface of the cartridge workpiece 5, so that the distribution and flow of the electrolyte in the machining gap during the machining process are more uniform, and the machining quality is stable; the matching end surface of the sealing sleeve 6 towards the cartridge workpiece 5 matches the curvature of the cartridge workpiece 5, so that the matching between the sealing sleeve 6 and the cartridge is tight during the machining process, and the flow field sealing effect is ensured.

[0053] The electrolytic machining method of the embodiment is applied to the cartridge cavity sealed side flow type electrolytic machining device described above, and includes the following steps.

[0054] S1. Install the cartridge workpiece 5.

[0055] Specifically, the conductive plate 4 is connected with the machine tool rotary table, is aligned and fixed after the outer circle of the conductive plate 4 is aligned; the cartridge workpiece 5 is installed on the boss structure of the conductive plate 4, the cover plate 3 is tightened, the first locking nut 2 is tightened, and the workpiece is pressed tightly; the roundness of the outer surface of the cartridge workpiece 5 is checked by a dial gauge, and the roundness should be less than 0.3 mm.

[0056] S2. Install the cathode assembly.

[0057] Specifically, the mounting plate 15 is connected with the machine tool spindle, the column 14 and the positioning plate 12 are installed in sequence; the end surface of the positioning plate 12 is aligned by a dial gauge, the positioning seat 22 is installed on the positioning plate 12, the outer circle and the end surface of the positioning seat 22 are aligned, and then the locking screw 21 is fixed; the main cathode 20 is installed, and the main cathode 20 is dragged flat by rotating the machine tool spindle.

[0058] S3. Install the sealing assembly.

[0059] Specifically, the first sealing ring 18 is embedded in the first installation groove; the sealing sleeve 6 is sleeved on the main cathode 20, and the second sealing ring 19 is embedded in the second installation groove.

[0060] S4. The machine tool is connected to the power supply, the machine tool spindle is connected to the negative electrode of the power supply, and the machine tool rotary table is connected to the positive electrode of the power supply; the sealing sleeve 6 is tightly sealed on the outer surface of the cartridge workpiece 5 by the pressing mechanism; the sealing sleeve 6 is fed with the machine tool spindle to be pressed tightly to the outer surface of the cartridge workpiece 5, and under the action of the elastic element 10 of the pressing mechanism, the sealing sleeve 6 and the second sealing member are tightly fixed on the outer surface of the cartridge workpiece 5, the first sealing member is sealed between the main cathode 20 and the sealing sleeve 6, and a closed side flow type cavity is formed.

[0061] S5. electrolyte is flowed into the inner cavity from the inlet 17, through the machining gap, and discharged from the outlet 16;

[0062] S6. the machine tool is connected to the power supply, machining parameters are set, machining is started, the main cathode 20 is continuously fed, and the sealing assembly is kept tightly sealed to the outer surface of the machine case under the action of the pressing mechanism;

[0063] Specifically, the voltage is set to 20V, the initial machining gap is 0.5mm, the feeding speed is 2mm / min, and the electrolyte pressure is 0.8Mpa; the electrolyte flow field is kept closed under the action of the pressing mechanism of the sealing assembly, and the machine case cavity 23 is machined under the electrochemical action;

[0064] S7. after the machining of the current cavity 23 is completed, the turntable is rotated to adjust the circumferential position of the machine case workpiece 5, and steps S4-S6 are repeated until the machining of all cavities 23 of the machine case workpiece 5 is completed; after the machining of the first cavity 23 is completed, the cathode assembly automatically retreats, the machine case workpiece 5 is automatically indexed to another machining position under the action of the turntable, and the machining of another cavity 23 is completed according to steps S4-S6 until the machining of all cavities 23 of the machine case is completed.

[0065] The machining method realizes the electrolytic machining of the machine case cavity under the condition of a closed flow field. The electrolyte flows into the inner cavity from the inlet 17, flows through the machining gap, and flows out from the outlet 16. The electrolyte in the machining gap is more full and uniformly distributed, the machining stability is improved, and the flow lines are eliminated. The problems of uneven electrolyte flow field, lack of electrolyte, residual boss, poor machining precision, etc. in the open positive flow electrolytic machining in the prior art are avoided. The machined machine case cavity surface has high roughness, no residual boss, and further improved machining precision, without the need for a polishing process. At the same time, electrolyte splashing is avoided, the corrosion of the inner wall of the machine tool is reduced, and the service life of the equipment is improved.

[0066] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A side flow electrochemical machining device with a pocket cavity seal, characterized in that, The application is applied to an electrolytic processing machine tool, and the electrolytic processing machine tool comprises a machine tool rotary table and a machine tool spindle, and the electrolytic processing device comprises: a clamping assembly for clamping a machine case workpiece (5) and fixing the machine case workpiece (5) to the machine tool rotary table, the machine tool rotary table being connected to a positive electrode of a power supply; a cathode assembly connected to the machine tool spindle and arranged on one side of the machine case along a radial direction of the machine case to form a processing gap between the cathode assembly and an outer surface of the machine case, the machine tool spindle being connected to a negative electrode of the power supply; a sealing assembly comprising a sealing sleeve (6) and a pressing mechanism, the sealing sleeve (6) having an inner cavity, a liquid inlet (17) and a liquid outlet (16) respectively arranged on two sides of the sealing assembly and respectively communicating with the inner cavity, the sealing assembly being sleeved on the cathode assembly so that a processing end of the cathode assembly is located in the inner cavity, and the pressing mechanism is used for keeping the sealing sleeve (6) tightly sealed on the outer surface of the machine case to seal the inner cavity, and the liquid inlet (17) is used for introducing an electrolyte to flow through the processing gap and be discharged through the liquid outlet (16); the cathode assembly comprises a mounting plate (15) connected to the machine tool spindle and a positioning plate (12) connected to the mounting plate (15) through a stand column (14), and the positioning plate (12) is provided with a positioning seat (22) for mounting a main cathode (20); the pressing mechanism comprises a positioning rod (11) arranged along the direction of the machine tool spindle, a first end of the positioning rod (11) being connected to the positioning plate (12), a second end of the positioning rod (11) being threadedly connected to a limiting plate (8), the positioning rod (11) being sleeved with a limiting sleeve (9) located between the positioning plate (12) and the limiting plate (8), and an elastic member (10) being arranged between the limiting sleeve (9) and the positioning plate (12), the elastic member (10) being used for providing an elastic force in a compressed state to make the limiting plate (8) act on the sealing sleeve (6) and then make the sealing sleeve (6) tightly sealed on the machine case workpiece (5).

2. The pocket-enclosed side flow electrochemical machining apparatus according to claim 1, wherein The clamping assembly comprises a conductive plate (4), a pressing plate (3), a stud (1) and a first locking nut (2), the conductive plate (4) and the stud (1) being respectively connected to the machine tool rotary table, the conductive plate (4) being provided with a boss structure for positioning the machine case in a radial direction, the pressing plate (3) being arranged at an end of the machine case workpiece (5) away from the conductive plate (4), the stud (1) being arranged through the pressing plate (3), and the first locking nut (2) being used for being connected to the stud (1) to lock the pressing plate (3) and then fasten the machine case workpiece (5) to the conductive plate (4).

3. The pocket-enclosed side flow electrochemical machining apparatus according to claim 1, wherein The positioning rod (11) comprises a first threaded section at a first end, a second threaded section at a second end and a positioning section between the first threaded section and the second threaded section, the diameter of the positioning section being greater than the diameters of the first threaded section and the second threaded section, the first threaded section being arranged through the positioning plate (12) and threadedly connected to the second locking nut (13) to abut against the positioning section to the positioning plate (12), the second threaded section being threadedly connected to the limiting plate (8) and the second threaded section being threadedly connected to the adjusting nut (7) to limit the axial connection position of the second threaded section and the limiting plate (8).

4. The pocket-enclosed side flow electrochemical machining apparatus according to claim 1, wherein The sealing assembly further comprises a first sealing structure arranged between the sealing sleeve (6) and the cathode assembly, and a second sealing structure arranged on a side of the sealing sleeve (6) facing the matching end face of the cartridge.

5. The pocket-enclosed side flow electrochemical machining apparatus according to claim 4, wherein The first sealing structure comprises a first mounting groove arranged on the inner side of the sealing sleeve (6) or on the outer side of the cathode assembly, and a first sealing ring (18) embedded in the first mounting groove; and the second sealing structure comprises a second mounting groove arranged on the matching end face, and a second sealing ring (19) embedded in the second mounting groove.

6. The pocket-enclosed side flow electrochemical machining apparatus according to claim 1, wherein A flow guide structure is arranged in the sealing sleeve (6) to guide the electrolyte flowing into the inlet (17) to the machining gap and guide the electrolyte flowing out of the machining gap to the outlet (16).

7. The pocket-enclosed side flow electrochemical machining apparatus according to claim 1, wherein The machining end of the cathode assembly matches the curvature of the outer surface of the cartridge workpiece (5), and the matching end face of the sealing sleeve (6) facing the cartridge workpiece (5) matches the curvature of the cartridge workpiece (5).

8. An electrochemical machining method, characterized by, The application is applied to the side flow type electrochemical machining device for closing the cartridge cavity, comprising: S1. Installing the cartridge workpiece; S2. Installing the cathode assembly; S3. Installing the sealing assembly; S4. The machine tool is connected to the power supply, the machine tool spindle is connected to the negative electrode of the power supply, the machine tool turntable is connected to the positive electrode of the power supply, and the sealing sleeve is pressed and sealed on the outer surface of the cartridge workpiece through the pressing mechanism; S5. The electrolyte is introduced to flow into the inner cavity through the inlet, flow through the machining gap, and be discharged through the outlet; S6. The machine tool is connected to the power supply, the machining parameters are set, the machining is started, the main cathode is continuously fed, and the sealing assembly is kept pressed and sealed on the outer surface of the cartridge under the action of the pressing mechanism; S7. After completing the machining of the current cavity, the turntable is rotated to adjust the circumferential position of the cartridge workpiece, and steps S4-S6 are repeated until the machining of all cavities of the cartridge workpiece is completed.

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