Electrocorrosion machining clamp for cylinder structure

Abstract

The utility model discloses an electro-corrosion machining clamp for a cylinder structure, which relates to the technical field of electro-corrosion machining and comprises a base, a clamping part, a centering support and a centering component, the clamping part and the centering support are coaxially arranged at two opposite ends of the base, and the centering component is arranged between the clamping part and the centering support. The centering assembly comprises an adjusting sleeve matched with the clamping part, a first positioning mandrel matched with the adjusting sleeve and the to-be-machined cylinder structure, and a second positioning mandrel matched with the to-be-machined cylinder structure and the centering support for use, the clamping part is driven to rotate, and then the centering assembly drives the to-be-machined cylinder structure to coaxially rotate. According to the technical scheme, the requirement for the precision of the to-be-machined cylinder structure during clamping is met, the clamping mode is stable, the clamping part can drive the to-be-machined cylinder structure to rotate when rotating, the axis cannot be changed, the machining process is stable enough, and then the machining precision requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of electro-corrosion processing technology, and in particular to an electro-corrosion processing fixture for a cylindrical structure. Background Technology

[0002] Electro-erosion machining technology is widely used in high-precision fields such as mold manufacturing, aerospace, electronic devices, and medical equipment. It is especially used for machining difficult-to-machine materials such as titanium alloys, cemented carbide, and stainless steel.

[0003] Electro-corrosion machining relies on the principle of electrochemical reaction. The workpiece acts as the anode, and when an electric current is passed through the electrolyte, the metal is corroded on the anode surface, while the cathode remains unaffected. By controlling parameters such as current density, time, and liquid composition, fine machining of metallic materials can be achieved.

[0004] However, during electro-erosion machining, when the size and position of the annular pattern on the cylinder reach the micrometer level, existing fixture methods cannot reliably guarantee machining accuracy, and it is difficult to achieve a positional accuracy of 3 to 6 micrometers.

[0005] The novel fixture structure proposed in this application aims to solve the problem that the machining accuracy of various holes distributed in a ring on a cylinder is difficult to reach the micron level, thereby further improving the machining accuracy and stability of such workpieces. Summary of the Invention

[0006] The main purpose of this invention is to provide a cylindrical structure electro-corrosion machining fixture, which aims to improve machining stability and drilling accuracy of cylindrical structures.

[0007] To achieve the above objectives, this utility model proposes a cylindrical structure electro-corrosion machining fixture, which includes a base, a clamping part and a centering bracket coaxially disposed at opposite ends on the base, and a centering assembly disposed between the clamping part and the centering bracket; the centering assembly includes an adjusting sleeve that cooperates with the clamping part, a first positioning mandrel that cooperates with the adjusting sleeve and the cylindrical structure to be machined, and a second positioning mandrel that cooperates with the cylindrical structure to be machined and the centering bracket. Driving the clamping part to rotate causes the centering assembly to drive the cylindrical structure to be machined to rotate coaxially.

[0008] In one embodiment, the clamping part is a three-jaw chuck, with the angle between two adjacent clamping jaws being 120°, and the clamping center of the three-jaw chuck is on the same straight line as the axis of the centering component and the centering bracket.

[0009] In one embodiment, the centering component further includes a hollow fastening sleeve disposed between the first positioning mandrel and the cylindrical structure to be processed, and at least two sets of first positioning components are radially symmetrically disposed on the fastening sleeve.

[0010] The fastening sleeve surrounds at least a portion of one end of the first positioning mandrel and at least a portion of one end of the cylindrical structure to be processed, and the positioning assembly fixes the first positioning mandrel and the radial sides of the cylindrical structure to be processed respectively.

[0011] In one embodiment, the adjusting sleeve is hollow to form a cavity, and has an opening at one end near the positioning mandrel. The end of the first positioning mandrel away from the adjusting sleeve is provided with a first limiting protrusion. The end of the first positioning mandrel near the adjusting sleeve extends into the internal cavity of the adjusting sleeve. The sidewall of the first limiting protrusion abuts against the end face of the adjusting sleeve. The adjusting sleeve is provided with at least two radially symmetrical sets of second positioning components on the outer periphery of the first positioning mandrel for fixing the first positioning mandrel in the cavity.

[0012] In one embodiment, the first limiting protrusion is spaced apart from the end face of the first positioning mandrel near the fastening sleeve, and the first limiting protrusion has a positioning groove corresponding to the first positioning component of the fastening sleeve; the inner diameter of the fastening sleeve is adapted to the outer diameter of the cylindrical structure to be processed, the outer diameter of the first limiting protrusion of the first positioning mandrel is adapted to the inner diameter of the fastening sleeve, the outer diameter of the first positioning mandrel is adapted to the inner diameter of the cylindrical structure to be processed, and the sidewall of the first limiting protrusion abuts against the end face of the cylindrical structure to be processed.

[0013] In one embodiment, at least one set of first positioning components is adapted to the positioning groove on the first limiting protrusion, and at least one set of first positioning components fixes one end of the cylindrical structure to be processed that extends into the fastening sleeve.

[0014] In one embodiment, the first positioning component engages with the planar surface of the cylindrical structure to be processed, and the first positioning component engages with the conical surface of the positioning groove.

[0015] In one embodiment, when the first positioning mandrel extends into the cavity inside the adjusting sleeve, a gap of 0.02 mm to 5 mm is provided between the outer surface of the first positioning mandrel and the inner surface of the adjusting sleeve.

[0016] In one embodiment, a processing groove is provided on the base corresponding to the position of the cylindrical structure to be processed, and the cylindrical structure to be processed can be subjected to unilateral electro-corrosion or unilateral electro-corrosion through the processing groove.

[0017] In one embodiment, a second limiting protrusion is provided at a distance between one end of the second positioning mandrel and the end face of the cylindrical structure to be processed. The outer diameter of the second positioning mandrel is adapted to the inner diameter of the cylindrical structure to be processed, and the sidewall of the second limiting protrusion abuts against the end face of the cylindrical structure to be processed.

[0018] The technical solution of this utility model adopts a coaxially arranged clamping part and centering bracket to control the centering component and the cylindrical structure to be processed to be on the same axis. By changing the connection method and axial extension direction of the adjusting sleeve, the first positioning mandrel and the second positioning mandrel, the adjusting sleeve, the first positioning mandrel and the second positioning mandrel are made coaxial with the clamping part and the centering bracket, which meets the accuracy requirements of the cylindrical structure to be processed when clamped. Moreover, this clamping method is stable. When the clamping part rotates, it can transmit power through the adjusting sleeve and the first positioning mandrel, thereby driving the rotation of the cylindrical structure to be processed without changing the axis, making the processing process stable enough, and thus achieving the required processing accuracy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 Exploded view of an embodiment of the cylindrical electro-corrosion machining fixture provided by this utility model;

[0021] Figure 2 A schematic diagram of the assembled structure of another embodiment of the cylindrical electro-corrosion machining fixture provided by this utility model;

[0022] Figure 3 An exploded view of the centering component of another embodiment of the cylindrical electro-corrosion machining fixture provided by this utility model;

[0023] Figure 4 This is a cross-sectional view of the assembled cylindrical electro-corrosion machining fixture provided by this utility model.

[0024] Explanation of icon numbers:

[0025] 1. Electro-corrosion machining fixture for cylindrical structures; 2. Cylindrical structure to be machined;

[0026] 11. Base; 12. Clamping part; 13. Centering component; 14. Centering bracket;

[0027] 131. Adjusting sleeve; 132. First positioning spindle; 133. Fastening sleeve; 134. Second positioning spindle; 135. First positioning assembly; 136. Second positioning assembly;

[0028] 1311, Cavity; 1321, First limiting protrusion; 1341, Second limiting protrusion; 1351, Fixing groove; 1352, Fixing component; 1361, Adjusting hole; 1362, Adjusting screw;

[0029] 13211, Positioning groove.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, such directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] Electro-erosion machining technology is widely used in high-precision fields such as mold manufacturing, aerospace, electronic devices, and medical equipment. It is especially used for machining difficult-to-machine materials such as titanium alloys, cemented carbide, and stainless steel.

[0035] Electro-corrosion machining relies on the principle of electrochemical reaction. The workpiece acts as the anode, and when an electric current is passed through the electrolyte, the metal is corroded on the anode surface, while the cathode remains unaffected. By controlling parameters such as current density, time, and liquid composition, fine machining of metallic materials can be achieved.

[0036] However, during electro-erosion machining, when the size and position of the annular pattern on the cylinder reach the micrometer level, existing fixture methods cannot reliably guarantee machining accuracy, and it is difficult to achieve a positional accuracy of 3 to 6 micrometers.

[0037] This utility model proposes a cylindrical structure electro-corrosion machining fixture.

[0038] Please combine Figures 1-4In one embodiment of this utility model, the cylindrical structure electro-corrosion machining fixture 1 includes a base 11, a clamping part 12 and a centering bracket 14 coaxially disposed at opposite ends on the base 11, and a centering component 13 disposed between the clamping part 12 and the centering bracket 14; the centering component 13 includes an adjusting sleeve 131 that cooperates with the clamping part 12, a first positioning mandrel 132 that cooperates with the adjusting sleeve 131 and the cylindrical structure 2 to be processed, and a second positioning mandrel 134 that cooperates with the cylindrical structure 2 to be processed and the centering bracket 14. When the clamping part 12 is driven to rotate, the centering component 13 drives the cylindrical structure 2 to be processed to rotate coaxially.

[0039] It should be noted that the clamping part 12, the adjusting sleeve 131, the first positioning spindle 132, the cylindrical structure to be processed 2, the second positioning spindle 134 and the spindle bracket are sequentially detachably connected and fixedly connected by abutment and snap-fit ​​to realize transmission.

[0040] Specifically, the clamping part 12 clamps one end of the adjusting sleeve 131. The adjusting sleeve 131 is hollow to form a cavity 1311, and the end near the positioning spindle is open to accommodate one end of the first positioning spindle 132 and fix the accommodating part. The end of the first positioning spindle 132 away from the adjusting sleeve 131 is engaged with one end of the cylindrical structure 2 to be processed, so that it can rotate coaxially.

[0041] One end of the second positioning mandrel 134 is slidably engaged with the mandrel bracket, so that the mandrel bracket can support the second positioning mandrel 134 and the cylindrical structure 2 to be processed to be coaxial, and the other end of the second positioning mandrel 134 abuts against the end of the cylindrical structure 2 to be processed away from the first positioning mandrel 132, thus providing support for the cylindrical structure 2 to be processed.

[0042] In one embodiment, the clamping part 12 is a three-jaw chuck, with the angle between two adjacent clamping jaws being 120°. The clamping center of the three-jaw chuck is on the same straight line as the axis of the centering component 13 and the centering bracket 14.

[0043] It should be noted that the three-jaw chuck is less expensive than the five-jaw chuck, and its accuracy is not affected. This fixture is suitable for electro-corrosion machining of cylindrical structures. In order to maintain stable clamping of the centering component 13 and to ensure that the stability is not affected during machining rotation, the angle between two adjacent clamping jaws is set to 120°.

[0044] The clamping center of the three-jaw chuck is aligned with the axis of the centering assembly 13 and the centering bracket 14. This ensures that when the clamping part 12 rotates, the straight line drives the rotation of the cylindrical structure 2 to be processed without deviating from the axis, thus further guaranteeing the processing accuracy.

[0045] In one embodiment, the centering component 13 further includes a hollow fastening sleeve 133 disposed between the first positioning mandrel 132 and the cylindrical structure 2 to be processed, and at least two sets of first positioning components 135 are radially symmetrically disposed on the fastening sleeve 133.

[0046] Specifically, the fastening sleeve 133 surrounds at least a portion of one end of the first positioning spindle 132 and at least a portion of one end of the cylindrical structure 2 to be processed, and the positioning assembly fixes the first positioning spindle 132 and the two radial sides of the cylindrical structure 2 to be processed inside, respectively.

[0047] It should be noted that the fastening sleeve 133 simultaneously surrounds at least a portion of one end of the first positioning spindle 132 and at least a portion of one end of the cylindrical structure 2 to be processed, and is respectively fixed by setting a set of first positioning components 135, thereby realizing the transmission relationship between the positioning spindle, the fastening sleeve 133 and the cylindrical structure 2 to be processed. Moreover, this method can manually control the axial height of the cylindrical structure 2 to be processed, which can further ensure the processing accuracy.

[0048] In one embodiment, the end of the first positioning spindle 132 that is away from the adjusting sleeve 131, that is, the end that is close to the fastening sleeve 133, is provided with a first limiting protrusion 1321 at a distance from the end face;

[0049] It should be noted that the outer surface of the first limiting protrusion 1321 protrudes relative to the outer surface of the first positioning spindle 132, and plays a limiting role in the first limiting protrusion 1321 that needs to be partially accommodated into the adjusting sleeve 131.

[0050] Specifically, when the end of the first positioning spindle 132 near the adjusting sleeve 131 extends into the internal cavity 1311 of the adjusting sleeve 131, the sidewall of the first limiting protrusion 1321 abuts against the end face of the adjusting sleeve 131. The adjusting sleeve 131 is provided with at least two radially symmetrical sets of second positioning components 136 on the outer periphery of the first positioning spindle 132 for fixing the first positioning spindle 132 in the cavity 1311.

[0051] It should be noted that the second positioning component 136 includes an adjustment hole 1361 opened on the adjustment sleeve 131 and an adjustment screw 1362 that is used in conjunction with the adjustment hole 1361. The adjustment hole 1361 and the adjustment screw 1362 can be threaded together to control different rotation progress and thus control the depth of the adjustment screw 1362 entering the cavity 1311, thereby controlling the angle between the axis of the first positioning spindle 132 in the cavity 1311 and the horizontal plane.

[0052] Setting at least two sets of second positioning components 136 is to fix the first positioning spindle 132 at different positions along its axial direction, and to cooperate with each other to complete the horizontal adjustment of the axis, thereby improving the machining accuracy.

[0053] In one embodiment, the first limiting protrusion 1321 has a positioning groove 13211 corresponding to the first positioning component 135 of the fastening sleeve 133. At least one set of first positioning components 135 is adapted to the positioning groove 13211 on the first limiting protrusion 1321. At least one set of first positioning components 135 fixes one end of the cylindrical structure 2 to be processed that extends into the fastening sleeve 133.

[0054] It should be noted that each set of first positioning components 135 is radially symmetrically arranged on the fastening sleeve 133, and is used to fix the first positioning mandrel 132 and the cylindrical structure 2 to be processed, respectively.

[0055] Specifically, the first positioning component 135 includes a fixing groove 1351 and a fastener 1352 adapted to the fixing groove 1351.

[0056] Optionally, the fixing groove 1351 and the fixing member 1352 are connected by threads.

[0057] Furthermore, since the cylindrical structure 2 to be processed is a product part, no additional wear or damage can be performed on the part structure during the processing. Therefore, the fixing slot 1351 opened for the cylindrical structure 2 to be processed is matched with a flat fixing part 1352, which is used to cooperate with the outer surface plane of the cylindrical structure 2 to be processed.

[0058] The contact area between the first positioning spindle 132 and the fastening sleeve 133 is small, and in order to ensure the stability of the transmission, it is necessary to strengthen the stability of the fixation. Therefore, the positioning groove 13211 and the fixing member 1352 are in conical surface fit.

[0059] More specifically, the inner diameter of the fastening sleeve 133 is adapted to the outer diameter of the cylindrical structure 2 to be processed, the outer diameter of the first limiting protrusion 1321 of the first positioning mandrel 132 is adapted to the inner diameter of the fastening sleeve 133, the outer diameter of the first positioning mandrel 132 is adapted to the inner diameter of the cylindrical structure 2 to be processed, and the side wall of the first limiting protrusion 1321 abuts against the end face of the cylindrical structure 2 to be processed.

[0060] In one embodiment, when the first positioning spindle 132 extends into the cavity 1311 inside the adjusting sleeve 131, a gap is provided between the outer surface of the first positioning spindle 132 and the inner surface of the adjusting sleeve 131, and the gap is 0.02 mm to 5 mm.

[0061] It should be noted that the gap is set to ensure that the first positioning mandrel 132 has an adjustable range within the cavity 1311 of the adjusting sleeve 131, thereby enabling precise control of the axial direction of the final cylindrical structure 2 to be processed.

[0062] In one embodiment, a processing groove is provided on the base 11 corresponding to the position of the cylindrical structure 2 to be processed, and the cylindrical structure 2 to be processed can be subjected to unilateral electro-corrosion or unilateral electro-corrosion through the processing groove.

[0063] It should be noted that the cylindrical electro-corrosion machining fixture 1 is compatible with machining equipment with a single-sided machining station. By opening a machining groove on the base 11, the cylindrical electro-corrosion machining fixture 1 can also be compatible with wire cutting machining equipment, increasing the process options for product processing and making it more adaptable.

[0064] In one embodiment, a second positioning mandrel 134 is provided with a second limiting protrusion 1341 at a distance from the end face of the cylindrical structure 2 to be processed. The outer diameter of the second positioning mandrel 134 is adapted to the inner diameter of the cylindrical structure 2 to be processed, and the side wall of the second limiting protrusion 1341 abuts against the end face of the cylindrical structure 2 to be processed.

[0065] Understandably, the first positioning mandrel 132 and the second positioning mandrel 134 clamp the cylindrical structure 2 to be processed from opposite ends, so that it can be processed at the processing position. At the same time, when the cylindrical structure 2 to be processed needs to be processed in a ring, it will not hinder its rotation while ensuring processing accuracy.

[0066] Understandably, the technical solution of this utility model uses a coaxially arranged clamping part 12 and a centering bracket 14 to control the centering component 13 and the cylindrical structure 2 to be processed to be on the same axis. By changing the connection method and axial extension direction of the adjusting sleeve 131, the first positioning spindle 132 and the second positioning spindle 134, the adjusting sleeve 131, the first positioning spindle 132 and the second positioning spindle 134 are made coaxial with the clamping part 12 and the centering bracket 14, which satisfies the accuracy of the cylindrical structure 2 to be processed when it is clamped. Moreover, this clamping method is stable. When the clamping part 12 rotates, it can be transmitted through the adjusting sleeve 131 and the first positioning spindle 132, thereby driving the rotation of the cylindrical structure 2 to be processed without changing the axis, making the processing process stable enough, and thus achieving the processing accuracy requirements.

[0067] Specifically, the three-jaw chuck is used to initially center and adjust the sleeve 131, so that the radial and axial runout of the adjusting sleeve 131 can reach 0-0.05. The radial and axial runout of the first positioning mandrel 132 is adjusted to 0-2μm using the adjusting screw 1362 on the adjusting sleeve 131. The mandrel bracket 14 is adjusted based on the adjusted first positioning mandrel 132 to make the coaxiality of the second positioning mandrel 134 with the first positioning mandrel 132 0-2μm. Assuming the inner hole of the cylindrical structure 2 to be processed is 8.5mm, the fitting dimension between the first positioning mandrel 132 and the second positioning mandrel 134 and the cylindrical structure 2 to be processed is 8.499mm, that is, the gap between the first positioning mandrel 132 and the second positioning mandrel 134 is 1μm. Through the fitting between the first positioning mandrel 132 and the second positioning mandrel 134 and the inner hole of the cylindrical structure 2 to be processed, the coaxiality of the axis of the cylindrical structure 2 to be processed and the rotation axis of the three-jaw chuck is less than 3 micrometers, thereby controlling the processing error of the cylindrical structure 2 to be processed within 3 micrometers.

[0068] It should be understood that the terms "one embodiment" or "one example" throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in one example" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0069] In various embodiments of this utility model, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0070] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0071] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A cylindrical electro-corrosion machining fixture, characterized in that: The cylindrical structure electro-erosion machining clamp comprises a base, clamping parts coaxially arranged on opposite ends of the base, a centering support, and a centering assembly arranged between the clamping parts and the centering support; The centering assembly comprises an adjusting sleeve matched with the clamping part, a first positioning arbor matched with the adjusting sleeve and the cylindrical structure to be machined, a second positioning arbor matched with the cylindrical structure to be machined and the centering support, and the centering assembly drives the cylindrical structure to be machined to rotate coaxially when the clamping part is driven to rotate.

2. The cylindrical structure electropolishing fixture of claim 1, wherein: The clamping part is a three-jaw chuck, and the angle between two adjacent clamping jaws is 120°, and the clamping center of the three-jaw chuck is coaxial with the axis of the centering assembly and the centering support.

3. The cylindrical structure electropolishing fixture of claim 1, wherein: The centering assembly further comprises a hollow fastening sleeve arranged between the first positioning arbor and the cylindrical structure to be machined, and at least two groups of first positioning assemblies are radially arranged on the fastening sleeve. The fastening sleeve surrounds at least part of one end of the first positioning arbor and at least part of one end of the cylindrical structure to be machined, and the positioning assemblies respectively fix the radial sides of the first positioning arbor and the cylindrical structure to be machined.

4. The cylindrical structure electropolishing fixture of claim 3, wherein: The adjusting sleeve is hollow to form a cavity, and one end close to the positioning arbor is open, and one end of the first positioning arbor away from the adjusting sleeve is provided with a first limiting protrusion. The first limiting protrusion is arranged in the cavity of the adjusting sleeve, and the side wall of the first limiting protrusion abuts against the end surface of the adjusting sleeve, and the adjusting sleeve is provided with at least two groups of second positioning assemblies radially symmetrically arranged on the outer periphery corresponding to the first positioning arbor for fixing the first positioning arbor in the cavity.

5. The cylindrical structure electropolishing fixture of claim 4, wherein: The first limiting protrusion is arranged in the cavity of the adjusting sleeve, and the side wall of the first limiting protrusion abuts against the end surface of the adjusting sleeve, and the adjusting sleeve is provided with at least two groups of second positioning assemblies radially symmetrically arranged on the outer periphery corresponding to the first positioning arbor for fixing the first positioning arbor in the cavity. The inner diameter of the fastening sleeve is matched with the outer diameter of the cylindrical structure to be machined, the outer diameter of the first limiting protrusion of the first positioning arbor is matched with the inner diameter of the fastening sleeve, the outer diameter of the first positioning arbor is matched with the inner diameter of the cylindrical structure to be machined, and the side wall of the first limiting protrusion abuts against the end surface of the cylindrical structure to be machined.

6. The cylindrical structure electropolishing fixture of claim 5, wherein: At least one group of first positioning assemblies is matched with the positioning groove on the first limiting protrusion, and at least one group of first positioning assemblies fixes one end of the cylindrical structure to be machined inserted into the fastening sleeve.

7. The cylindrical structure electropolishing fixture of claim 6, wherein: The first positioning assembly is matched with the plane of the cylindrical structure to be machined, and the first positioning assembly is matched with the tapered surface of the positioning groove.

8. The cylindrical structure electropolishing fixture of claim 4, wherein: When the first positioning arbor is inserted into the cavity of the adjusting sleeve, a gap is arranged between the outer surface of the first positioning arbor and the inner surface of the adjusting sleeve, and the gap is 0.02mm-5mm.

9. The cylindrical structure electropolishing fixture of claim 1, wherein: A machining groove is arranged on the base corresponding to the position of the cylindrical structure to be machined, and the cylindrical structure to be machined can be subjected to one-side electro-erosion or double-side electro-erosion through the machining groove.

10. The cylindrical structure electropolishing fixture of claim 1, wherein: The second limiting protrusion is arranged on the end of the second positioning arbor away from the cylindrical structure to be machined, the outer diameter of the second positioning arbor is matched with the inner diameter of the cylindrical structure to be machined, and the side wall of the second limiting protrusion abuts against the end surface of the cylindrical structure to be machined.

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