Lateral flow type electrolytic machining device with closed casing cavity and electrolytic machining method

Abstract

The invention discloses a side-flow type electrolytic machining device and method for sealing a casing cavity, an electrolytic machining machine tool comprises a machine tool rotary table and a machine tool spindle, the electrolytic machining device comprises a clamping assembly, a clamping assembly, a clamping assembly and a clamping assembly, the clamping assembly is used for clamping a casing workpiece and fixing the casing workpiece to the machine tool rotary table, and the machine tool rotary table is connected with the positive electrode of a power source; the cathode assembly is connected with the machine tool spindle and arranged on one side of the cartridge receiver in the radial direction of the cartridge receiver so as to form a machining gap with the outer surface of the cartridge receiver, and the machine tool spindle is connected with the negative electrode of the power source; the sealing assembly comprises a sealing sleeve and a pressing mechanism, the sealing sleeve is provided with an inner cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are located on the two sides of the sealing assembly respectively and communicate with the inner cavity, and the sealing assembly is arranged on the cathode assembly in a sleeving mode so that the machining end of the cathode assembly can be located in the inner cavity; the pressing mechanism is used for enabling the sealing assembly to be pressed and sealed on the outer surface of the casing so as to seal the inner cavity, and the liquid inlet is used for introducing electrolyte to flow through the machining gap and be discharged through the 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. In addition, the present invention also relates to an electrochemical machining method including the side-flow electrochemical machining device with a closed casing cavity. Background Art

[0002] The casing is an important part of the aircraft engine. Most of its materials are difficult-to-cut materials such as nickel-based high-temperature alloys, and there are a large number of lightened cavities on the casing surface. The cavity depth ranges from 1mm to 5mm. Currently, five-axis CNC milling is mainly used to process the lightened cavities, which faces the problems of severe tool loss, high cost, and low processing efficiency, and cannot meet the requirements of mass production. Electrolytic machining is a special processing method that uses the principle of electrochemical anode dissolution of metals to achieve workpiece processing and forming. Compared with other processing methods, electrolytic machining has the following characteristics: theoretically, the tool cathode has no loss and can be used unlimited times; high processing efficiency; good processing surface quality; non-contact processing, no cutting stress is introduced, and it is very suitable for the processing of casing cavities.

[0003] For this type of casing parts with cavities, the most commonly used process is copy electrolytic 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 costly. Figure 1 At present, 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, and additional polishing is required to remove the bosses; the flow field parameters such as flow velocity and pressure of the open flow field are very unevenly distributed in the processing gap, and the differences are very large in different places. The flow direction of the electrolyte is uncontrollable, and it is very easy to lack liquid. The stability is poor, and the conductivity distribution is uneven, 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 corrodes the inner wall of the machine tool. Summary of the invention

[0004] The 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 electrolytic machining device with a closed casing cavity is applied to an electrolytic machining machine tool. The electrolytic machining machine tool includes a machine tool turntable and a machine tool spindle. The electrolytic machining device includes:

[0007] A clamping assembly is used to clamp the casing workpiece and fix the casing workpiece on the machine tool turntable, and the machine tool turntable is connected to the positive pole of the power supply;

[0008] A cathode assembly is connected to a machine tool spindle and is arranged on one side of the casing along a radial direction of the casing to form a machining gap with an outer surface of the casing, and the machine tool spindle is connected to a negative electrode of a power supply;

[0009] The sealing assembly comprises a sealing sleeve and a clamping mechanism, wherein the sealing sleeve has an inner cavity, a liquid inlet and a liquid outlet respectively located on both sides of the sealing assembly and connected to the inner cavity, the sealing assembly is sleeved on the cathode assembly so that the processing end of the cathode assembly is located in the inner cavity, the clamping mechanism is used to keep the sealing assembly pressed and sealed on the outer surface of the casing to close the inner cavity, and the liquid inlet is used to introduce electrolyte to flow through the processing gap and discharge it through the liquid outlet.

[0010] As a further improvement of the above technical solution, the clamping assembly includes a conductive plate, a pressure plate, a stud and a first locking nut. The conductive plate and the stud are respectively connected to the machine tool turntable. The conductive plate is provided with a boss structure for radially positioning the casing. The pressure plate is arranged at one end of the casing workpiece away from the conductive plate. The stud is passed through the pressure plate. The first locking nut is used to be connected to the stud to lock the pressure plate and thereby fasten the casing workpiece to the conductive plate.

[0011] As a further improvement of the above technical solution, the cathode assembly includes a mounting plate connected to the machine tool spindle and a positioning plate connected to the mounting plate through a column, and a positioning seat for mounting the main cathode is provided on the positioning plate.

[0012] As a further improvement of the above technical solution, the clamping mechanism includes a positioning rod arranged along the main axis direction of the machine tool, the first end of the positioning rod is connected to the positioning plate, the second end of the positioning rod is threadedly connected to the limiting plate, the positioning rod sleeve is provided with a limiting sleeve located between the positioning plate and the limiting plate, an elastic member is arranged between the limiting sleeve and the positioning plate, and the elastic member is used to provide elastic force in a compressed state so that the limiting plate acts on the sealing sleeve and thereby the sealing sleeve is pressed and sealed to the receiver workpiece.

[0013] As a further improvement of the above technical solution, the positioning rod includes a first threaded segment located at the first end, a second threaded segment located at the second end, and a positioning segment located between the first threaded segment and the second threaded segment. The diameter of the positioning segment is larger than the diameter of the first threaded segment and the diameter of the second threaded segment. The first threaded segment is passed through the positioning plate and is threadedly connected to the positioning segment with a second locking nut to press against the positioning plate. The second threaded segment is threadedly connected to the limiting plate and the second threaded segment is threadedly connected to the adjusting nut to limit the axial connection position of the second threaded segment and the limiting plate.

[0014] As a further improvement of the above technical solution, the sealing assembly further includes a first sealing structure arranged between the sealing sleeve and the cathode assembly and a second sealing structure arranged on a mating end surface of the sealing sleeve facing the casing.

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

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

[0017] As a further improvement of the above technical solution, the processed end of the cathode assembly matches the curvature of the outer surface of the casing workpiece, and the mating end surface of the sealing sleeve facing the casing workpiece matches the curvature of the casing workpiece.

[0018] According to another aspect of the present invention, there is also provided an electrolytic machining method, which comprises the above-mentioned side-flow electrolytic machining device with a closed casing cavity, comprising:

[0019] S1. Install the casing workpiece;

[0020] S2. Install cathode assembly;

[0021] S3. Install 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 and sealed to the outer surface of the casing workpiece by the pressing mechanism;

[0023] S5. The electrolyte is introduced so that the electrolyte flows from the liquid inlet into the inner cavity, flows through the processing gap and is discharged through the liquid outlet;

[0024] S6. The machine tool is powered on, the processing parameters are set, and the processing starts. The main cathode is continuously fed, and the sealing component is kept pressed and sealed on the outer surface of the casing by the pressing mechanism;

[0025] S7. After the current cavity processing is completed, the turntable rotates to adjust the circumferential position of the casing workpiece, and steps S4-S6 are repeated until all the cavities of the casing workpiece are processed.

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

[0027] The electrolytic machining device clamps and fixes the casing workpiece on the machine tool turntable through a clamping assembly and connects it to the positive pole of the power supply. The cathode assembly is connected to the machine tool spindle and connected to the negative pole of the power supply. During machining, the cathode assembly is controlled by the machine tool spindle to feed radially along the casing workpiece to maintain a machining gap. A sealing sleeve is sleeved on the cathode assembly and a clamping mechanism is used to clamp the sealing sleeve to maintain a sealed fit with the outer surface of the casing workpiece. During machining, the sealing sleeve is always pressed and sealed to the outer surface of the casing workpiece by the clamping mechanism to keep the inner cavity closed, thereby realizing electrolytic machining of the casing cavity under closed flow field conditions. The electrolyte flows in from the liquid inlet, flows through the machining gap, and then flows out from the liquid outlet. The electrolyte in the gap is more full and evenly distributed, which improves the processing stability and eliminates flow lines, avoiding the problems of uneven electrolyte flow field, lack of liquid, residual bosses, poor processing accuracy, etc. in the open positive flow electrolytic machining in the prior art. The casing cavity electrolytically machined by the device has high surface roughness and no residual bosses, and the processing accuracy is further improved. At the same time, it avoids electrolyte splashing, reduces corrosion to the inner wall of the machine tool, and improves the service life of the equipment. After completing the processing of part of the casing cavity, the machine tool spindle retracts to separate the cathode assembly and the sealing sleeve from the casing workpiece, and the casing workpiece is controlled by the machine tool turntable to rotate circumferentially to complete the processing of other casing cavities.

[0028] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

[0031] Figure 2 It is a structural schematic diagram of a preferred embodiment of the present invention;

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

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

[0034] Figure 5 It is a schematic diagram of the casing workpiece structure of a preferred embodiment of the present invention.

[0035] Legend:

[0036] 1. Stud; 2. First locking nut; 3. Pressure plate; 4. Conductive plate; 5. Casing 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. 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 invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0038] Figure 2 It is a structural schematic diagram of a preferred embodiment of the present invention; Figure 3 is a schematic diagram of a closed side flow field according to a preferred embodiment of the present invention; Figure 5 is a cross-sectional view of a workpiece clamping of a preferred embodiment of the present invention;

[0039] like Figures 2 to 5 As shown, the side-flow electrolytic machining device with a closed casing cavity of this embodiment is applied to an electrolytic machining machine tool. The electrolytic machining machine tool includes a machine tool turntable and a machine tool spindle. The electrolytic machining device includes:

[0040] A clamping assembly, used for clamping the casing workpiece 5 and fixing the casing workpiece 5 on a machine tool turntable, wherein the machine tool turntable is connected to the positive pole of a power supply;

[0041] A cathode assembly is connected to a machine tool spindle and is arranged on one side of the casing along a radial direction of the casing to form a machining gap with an outer surface of the casing, and the machine tool spindle is connected to a negative electrode of a power supply;

[0042] The sealing assembly includes a sealing sleeve 6 and a clamping mechanism. The sealing sleeve 6 has an inner cavity, a liquid inlet 17 and a liquid outlet 16 which are respectively located on both sides of the sealing assembly and connected to the inner cavity. The sealing assembly is sleeved on the cathode assembly so that the processing end of the cathode assembly is located in the inner cavity. The clamping mechanism is used to keep the sealing assembly pressed and sealed on the outer surface of the casing to close the inner cavity. The liquid inlet 17 is used to introduce electrolyte to flow through the processing gap and discharge it through the liquid outlet 16.

[0043] The cathode assembly of this embodiment may be a solid cathode without a liquid channel;

[0044] It can be understood that the electrolytic machining device clamps and fixes the casing workpiece 5 on the machine tool turntable through the clamping assembly and connects it to the positive pole of the power supply, and the cathode assembly is connected to the machine tool spindle and connected to the negative pole of the power supply. During the machining process, the cathode assembly is controlled by the machine tool spindle to feed radially along the casing workpiece 5 to maintain the machining gap; the sealing sleeve 6 is sleeved on the cathode assembly and the sealing sleeve 6 is pressed by the clamping mechanism to maintain the sealing cooperation with the outer surface of the casing workpiece 5, that is, during the machining process, the sealing sleeve 6 is always pressed and sealed on the outer surface of the casing workpiece 5 under the action of the clamping mechanism to keep the inner cavity closed, thereby realizing the casing cavity electrolytic machining under the condition of closed flow field, and the electrolyte flows in from the liquid inlet 17, flows through the machining gap, and then flows out through the liquid outlet 16 The electrolyte in the machining gap is more full and evenly distributed, which improves the machining stability and eliminates flow lines, avoiding the problems of uneven electrolyte flow field, lack of liquid, residual bosses, poor machining accuracy, etc. in the open positive flow electrolytic machining in the prior art. The casing cavity electrolytically machined by the device has high surface roughness and no residual bosses, and the machining accuracy is further improved. There is no need for polishing process, and at the same time, it avoids electrolyte splashing, reduces corrosion to the inner wall of the machine tool, and improves the service life of the equipment. After completing the machining of part of the casing cavity, the machine tool spindle retracts to separate the cathode assembly and the sealing sleeve 6 from the casing workpiece 5, and the casing workpiece 5 is controlled by the machine tool turntable to rotate circumferentially to complete the other casing cavity machining.

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

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

[0047] In this embodiment, the clamping mechanism includes a positioning rod 11 arranged along the main axis direction of the machine tool, the first end of the positioning rod 11 is connected to the positioning plate 12, the second end of the positioning rod 11 is threadedly connected to the 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, and an elastic member 10 is arranged between the limiting sleeve 9 and the positioning plate 12, and the elastic member 10 is used to provide elastic force in a compressed state to make the limiting plate 8 act on the sealing sleeve 6 so as to press and seal the sealing sleeve 6 to the casing workpiece 5;

[0048] In this embodiment, the positioning rod 11 includes a first threaded section located at the first end, a second threaded section located at the second end, and a positioning section located between the first threaded section and the second threaded section. The diameter of the positioning section is larger than the diameter of the first threaded section and the diameter of the second threaded section. The first threaded section is passed through the positioning plate 12 and is threadedly connected to the positioning section with the second locking nut 13 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] Among them, the positioning section can be set to 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 larger than the diameter of the second positioning section, the inner diameter of the limiting sleeve 9 matches the second positioning section, and the limiting sleeve is set to be reduced in diameter toward one end of the casing workpiece so that the end matches the second threaded section, the elastic member 10 is a spring sleeve arranged 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 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 respectively cooperate with the positioning plate 12 and the end of the limiting sleeve 9, and the structure is simple and compact; before processing, the position of the limiting sleeve is limited by adjusting the nut to ensure that the elastic member is in a compressed state when the machine tool spindle is fed to the sealing sleeve and the casing workpiece, thereby ensuring the sealing during the processing.

[0050] In this embodiment, the sealing assembly further includes a first sealing structure disposed between the sealing sleeve 6 and the cathode assembly and a second sealing structure disposed on a mating end surface of the sealing sleeve 6 facing the casing. Specifically, the first sealing structure includes a first mounting groove provided on the inner side of the sealing sleeve 6 or provided on the outer side of the cathode assembly and a first sealing ring 18 embedded in the first mounting groove. The second sealing structure includes a second mounting groove provided on the mating end surface and a second sealing ring 19 embedded in the second mounting groove. The sealing sleeve 6 and the cathode assembly are sealed by the first sealing ring 18. The sealing sleeve 6 is pressed against the outer surface of the casing under the action of the pressing mechanism, and sealing is achieved by the second sealing ring 19 between the two.

[0051] In this embodiment, a guide structure is provided in the sealing sleeve 6 to guide the electrolyte flowing into the liquid inlet 17 to the processing gap and to guide the electrolyte flowing out of the processing gap to flow to the liquid outlet 16. The guide structure is an inclined surface located between the liquid inlet 17 and the processing gap and an inclined surface located between the liquid outlet 16 and the processing gap, so that the electrolyte flowing into the liquid inlet 17 can more easily flow to the processing gap, and the electrolyte flowing out of the processing gap can more easily flow to the liquid outlet 16.

[0052] In this embodiment, the processing end of the cathode assembly matches the curvature of the outer surface of the casing workpiece 5, so that the electrolyte distribution and flow in the processing gap during the processing are more uniform, thereby ensuring stable processing quality; the mating end surface of the sealing sleeve 6 facing the casing workpiece 5 matches the curvature of the casing workpiece 5, and during the processing, the sealing sleeve 6 and the casing are ensured to fit closely to ensure the flow field sealing effect.

[0053] The electrolytic machining method of this embodiment is applied to the above-mentioned side-flow electrolytic machining device with a closed casing cavity, comprising:

[0054] S1. Install the casing workpiece 5;

[0055] Specifically, the conductive plate 4 is connected to the machine tool turntable, and the outer circle of the conductive plate 4 is aligned and then fixed; the casing workpiece 5 is installed on the boss structure of the conductive plate 4, and the pressing plate 3 is closed and the first locking nut 2 is tightened to press the workpiece; the roundness of the outer surface of the casing workpiece 5 is checked by a meter, and the roundness should be less than 0.3mm;

[0056] S2. Install cathode assembly;

[0057] Specifically, the mounting plate 15 is connected to the machine tool spindle, and the column 14 and the positioning plate 12 are installed in sequence; the end surface of the positioning plate 12 is aligned by dialing, and the positioning seat 22 is installed on the positioning plate 12. After the outer circle and the end surface of the positioning seat 22 are aligned, the locking screw 21 is fixed, and the main cathode 20 is installed, and the main cathode 20 is leveled 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 pole of the power supply, and the machine tool turntable is connected to the positive pole of the power supply; the sealing sleeve 6 is pressed and sealed to the outer surface of the casing workpiece 5 by the pressing mechanism; the sealing sleeve 6 moves with the machine tool spindle to be pressed to the outer surface of the casing workpiece 5, and under the action of the elastic member 10 of the pressing mechanism, the sealing sleeve 6 and the second sealing member are pressed and fixed to the outer surface of the casing workpiece 5, and the main cathode 20 and the sealing sleeve 6 are sealed by the first sealing member to form a closed side flow cavity;

[0061] S5. The electrolyte is passed through the inlet 17 so that the electrolyte flows into the inner cavity and flows through the processing gap and is discharged through the outlet 16;

[0062] S6. The machine tool is powered on, the processing parameters are set, and the processing is started. The main cathode 20 is continuously fed, and the sealing assembly is kept tightly sealed on the outer surface of the casing under the action of the clamping mechanism;

[0063] Specifically, the voltage is set to 20V, the initial machining gap is 0.5mm, the feed speed is 2mm / min, and the electrolyte pressure is 0.8Mpa; the electrolyte flow field is kept closed under the action of the clamping mechanism of the sealing component, and the casing cavity 23 is processed under the electrochemical action;

[0064] S7. After completing the processing of the current cavity 23, the turntable rotates to adjust the circumferential position of the casing workpiece 5, and steps S4-S6 are repeated until all the cavities 23 of the casing workpiece 5 are processed; after the first cavity 23 is processed, the cathode assembly automatically retracts, and the casing workpiece 5 is automatically indexed to another processing position under the action of the turntable, and another cavity 23 is processed according to steps S4-S6 until all the cavities 23 of the casing are processed.

[0065] The processing method realizes electrolytic processing of the casing cavity under closed flow field conditions. The electrolyte flows in from the liquid inlet 17, flows through the processing gap, and then flows out from the liquid outlet 16. The electrolyte in the processing gap is more full and evenly distributed, which improves the processing stability and eliminates flow lines. It avoids the problems of uneven electrolyte flow field, lack of liquid, residual bosses, poor processing accuracy, etc. that occur in open positive flow electrolytic processing in the prior art. The surface roughness of the casing cavity after processing is high, without residual bosses, and the processing accuracy is further improved. There is no need for a polishing process. At the same time, it avoids electrolyte splashing, reduces corrosion to the inner wall of the machine tool, and improves the service life of the equipment.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A side-flow electrolytic machining device with a closed casing cavity, characterized in that: Applied to an electrolytic machining machine tool, the electrolytic machining machine tool includes a machine tool turntable and a machine tool spindle, and the electrolytic machining device includes: A clamping assembly, used for clamping a casing workpiece (5) and fixing the casing workpiece (5) on a machine tool turntable, wherein the machine tool turntable is connected to a positive pole of a power supply; A cathode assembly is connected to a machine tool spindle and is arranged on one side of the casing along a radial direction of the casing to form a machining gap with an outer surface of the casing, and the machine tool spindle is connected to a negative electrode of a power supply; The sealing assembly comprises a sealing sleeve (6) and a pressing mechanism, wherein the sealing sleeve (6) has an inner cavity, a liquid inlet (17) and a liquid outlet (16) respectively located on both sides of the sealing assembly and respectively connected to the inner cavity, the sealing assembly is sleeved on the cathode assembly so that the processing end of the cathode assembly is located in the inner cavity, the pressing mechanism is used to keep the sealing assembly pressed and sealed on the outer surface of the casing to close the inner cavity, and the liquid inlet (17) is used to introduce electrolyte to flow through the processing gap and discharge it through the liquid outlet (16).

2. The side-flow electrochemical machining device with closed casing cavity according to claim 1, characterized in that: The clamping assembly comprises a conductive plate (4), a pressure plate (3), a stud (1) and a first locking nut (2); the conductive plate (4) and the stud (1) are respectively connected to a machine tool turntable; a boss structure for radially positioning a casing is provided on the conductive plate (4); the pressure plate (3) is arranged at one end of a casing workpiece (5) away from the conductive plate (4); the stud (1) is passed through the pressure plate (3); and the first locking nut (2) is used to be connected to the stud (1) to lock the pressure plate (3) and thereby fasten the casing workpiece (5) to the conductive plate (4).

3. The side-flow electrochemical machining device with closed casing cavity according to claim 1, characterized in that: The cathode assembly comprises a mounting plate (15) connected to a machine tool spindle and a positioning plate (12) connected to the mounting plate (15) via a column (14); a positioning seat (22) for mounting a main cathode (20) is provided on the positioning plate (12).

4. The side-flow electrochemical machining device with closed casing cavity according to claim 3, characterized in that: The clamping mechanism comprises a positioning rod (11) arranged along the main axis direction of the machine tool, the first end of the positioning rod (11) is connected to the positioning plate (12), the second end of the positioning rod (11) is threadedly connected to the 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), and the elastic member (10) is used to provide elastic force in a compressed state so that the limiting plate (8) acts on the sealing sleeve (6) and thereby the sealing sleeve (6) is pressed and sealed on the casing workpiece (5).

5. The side-flow electrochemical machining device with closed casing cavity according to claim 4, characterized in that: The positioning rod (11) includes a first threaded section located at the first end, a second threaded section located at the second end, and a positioning section located between the first threaded section and the second threaded section, the diameter of the positioning section being larger than the diameter of the first threaded section and the diameter of the second threaded section, the first threaded section being passed through the positioning plate (12) and being threadedly connected to the positioning section with a second locking nut (13) and abutting against 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).

6. The side-flow electrochemical machining device with closed casing cavity according to claim 1, characterized in that: 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 mating end surface of the sealing sleeve (6) facing the casing.

7. The side-flow electrochemical machining device with closed casing cavity according to claim 6, characterized in that: The first sealing structure comprises a first mounting groove opened on the inner side of the sealing sleeve (6) or opened 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 opened on the matching end surface and a second sealing ring (19) embedded in the second mounting groove.

8. The side-flow electrochemical machining device with closed casing cavity according to claim 1, characterized in that: The sealing sleeve (6) is provided with a flow guiding structure to guide the electrolyte flowing into the liquid inlet (17) to the processing gap and to guide the electrolyte flowing out of the processing gap to the liquid outlet (16).

9. The side-flow electrochemical machining device with closed casing cavity according to claim 1, characterized in that: The processed end of the cathode assembly matches the curvature of the outer surface of the casing workpiece (5), and the mating end surface of the sealing sleeve (6) facing the casing workpiece (5) matches the curvature of the casing workpiece (5).

10. An electrolytic machining method, characterized in that: The side-flow electrolytic machining device for sealing the casing cavity as claimed in any one of claims 1 to 9 comprises: S1. Install the casing workpiece; S2. Install cathode assembly; S3. Install the sealing assembly; 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 and sealed to the outer surface of the casing workpiece by the pressing mechanism; S5. The electrolyte is introduced so that the electrolyte flows from the liquid inlet into the inner cavity, flows through the processing gap and is discharged through the liquid outlet; S6. The machine tool is powered on, the processing parameters are set, and the processing starts. The main cathode is continuously fed, and the sealing component is kept pressed and sealed on the outer surface of the casing by the pressing mechanism; S7. After the current cavity processing is completed, the turntable rotates to adjust the circumferential position of the casing workpiece, and steps S4-S6 are repeated until all the cavities of the casing workpiece are processed.

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