Tubular electrode and method of making same, electrolytic finishing method and apparatus

Abstract

The application discloses a tubular electrode and a preparation method, an electrolytic finishing machining method and a device thereof, and relates to the technical field of electrolytic machining. The tubular electrode comprises a tubular electrode body, the tubular electrode body is hollow inside, the upper and lower ends of the tubular electrode body are liquid inlet holes for flowing in electrolyte, and the side wall is provided with liquid outlet holes for flowing out electrolyte. The outer circumferential surface of the tubular electrode body is divided into a conductive area and an insulating area, the two side edges of the conductive area are parallel to the central axis of the tubular electrode body, and the liquid outlet holes are arranged in the insulating area. The electric field is intermittently supplied, and the flow field is intermittently flushed. The outer circumferential surface of the tubular electrode body is divided into the conductive area and the insulating area, the electrolysis is intermittent, the liquid flushing is intermittent, the electric field and the flow field are coupled, the high-locality control of the electric field and the high-locality flushing of the flow field in the machining area can be realized, the stray corrosion in the non-machining area and the machined area is inhibited, and the machining effect with high machining precision and high surface quality is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic machining, and in particular to a tubular electrode, a preparation method thereof, and an electrolytic finishing method and device. Background Art

[0002] For the processing of workpieces with straight surfaces, both wire electric discharge (EDM) and electrolytic wire cutting (ELC) are important methods. Wire electric discharge (EDM) refers to the generation of pulsed spark discharge between the workpiece material and the wire electrode, which produces electro-erosion, thereby achieving material processing. Wire electric discharge processing has low cost and good flexibility, but there are microcracks, recast layers and heat-affected zones on the workpiece surface, which affect the fatigue resistance of the workpiece. Wire electrolytic cutting refers to the generation of an anodic electrochemical dissolution reaction between the workpiece material and the wire electrode, and the dissolution and forming of the workpiece is achieved through the relative movement between the wire electrode and the workpiece. In addition to low cost and good flexibility, wire electrolytic cutting has no loss of wire electrode, no defective layer on the workpiece surface, and good surface quality. However, due to the difficulty in discharging the electrolytic products, it is difficult to achieve efficient processing and processing of large-thickness workpieces.

[0003] In applications requiring high surface integrity, such as aircraft engine turbine disc mortises and turbine blade shrouds, wire EDM cannot meet these surface quality requirements. Even with multiple cuts to thin the recast layer, application risks remain. While wire EDM can increase flow rate and enhance mass transfer through various methods, such as workpiece vibration, wire electrode rotation / vibration / reciprocating wire movement, and axial / radial flushing of the wire electrode, it still lacks the quality required for industrial production due to stray corrosive electric fields. Therefore, more effective finishing operations are necessary to improve quality.

[0004] For the above reasons, the method of first using wire EDM for rough forming and then finishing to remove the recast layer and surface defects has attracted attention. Among them, electrolytic finishing is superior to other process methods because it does not require the preparation of forming tools and there is no processing tool loss. During electrolytic finishing, the processing products are greatly reduced compared with electrolytic wire cutting cutting. At the same time, the flow field in the processing area is in an open state, and the products, bubbles and heat are easily discharged. The processing efficiency can be greatly improved and the processing accuracy is easier to ensure. However, during electrolytic finishing, the wire electrode and the workpiece are usually immersed in the electrolyte. Due to the presence of stray corrosion electric fields, the processed areas will suffer secondary corrosion from the stray electric fields, which will damage the surface quality and processing accuracy. Therefore, it is necessary to take measures to control the range of action of the electric field and achieve high-quality electrolytic finishing to improve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a tubular electrode and its preparation method, electrolytic finishing method and device to solve the problems existing in the above-mentioned prior art, so as to control the range of electric field action and achieve high-quality electrolytic finishing.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A tubular electrode comprises a tubular electrode body, the interior of the tubular electrode body being hollow, the upper and lower ends of the tubular electrode body being provided with liquid inlet holes for electrolyte inflow, and the side wall being provided with liquid outlet holes for electrolyte outflow; the outer circumferential surface of the tubular electrode body is divided into a conductive area and an insulating area, the two side edges of the conductive area being parallel to the central axis of the tubular electrode body, and the liquid outlet hole being provided in the insulating area.

[0008] Preferably, the central angle corresponding to the conductive area is a conductive angle, and the conductive angle is 30°-180°.

[0009] Preferably, the insulating region is coated with an insulating layer.

[0010] Preferably, the liquid outlet holes are multiple and arranged in an array.

[0011] The present invention also provides a method for preparing the tubular electrode, comprising the following steps:

[0012] S1. Use ordinary tubular electrodes as raw materials for electrophoresis insulation;

[0013] S2. Processing a liquid hole on the side wall of the tubular electrode body;

[0014] S3. Scrape off part of the insulating layer on the outer circumferential surface of the tubular electrode body.

[0015] The present invention also provides an electrolytic finishing method using the above tubular electrode, comprising the following steps:

[0016] S1. The workpiece is fixed to the fixture in the electrolyte tank on the machine, the tubular electrode is connected to the negative electrode of the power supply, and the workpiece is connected to the positive electrode of the power supply;

[0017] S2. The tubular electrode is continuously rotated by the rotating motor, and the workpiece is fed along its contour to be processed by the machine;

[0018] S3. When the rotation ends until the starting end of the conductive region coincides with the normal of the workpiece surface to be machined, turning on the DC power supply; when the rotation ends until the ending end of the conductive region coincides with the normal of the workpiece surface to be machined, turning off the DC power supply; when the rotation ends until one end of the liquid outlet coincides with the normal of the workpiece surface to be machined, performing electrolyte flushing; when the rotation ends until the other end of the liquid outlet coincides with the normal of the workpiece surface to be machined, turning off the electrolyte flushing;

[0019] S4. Repeat S3 until the workpiece surface to be processed is completed;

[0020] S5. Separate and clean the workpiece and tubular electrode.

[0021] Preferably, the rotation speed of the tubular electrode is 60-120 rpm, and the feed speed of the workpiece is 5*10 -7 m / s-8*10 -7 m / s.

[0022] Preferably, the initial machining gap between the tubular electrode and the surface to be machined of the workpiece is 0.02-0.04 mm.

[0023] The present invention also provides a processing device for the above electrolytic finishing method, comprising an electrolytic machine tool, a DC power supply, an electrolyte circulation system and a control system;

[0024] The electrolysis machine tool includes a Z-axis motion part for mounting a rotary motor and an XY-axis motion part for feeding a workpiece. The XY-axis motion part is provided with a fixture for fixing the workpiece and an electrolyte tank, and the fixture is located inside the electrolyte tank.

[0025] The tubular electrode is fixedly mounted on the output end of the rotating main shaft of the rotating motor. An electrolyte delivery channel is provided inside the rotating main shaft. The hollow interior of the tubular electrode is connected to the electrolyte delivery channel through a liquid inlet hole at the upper end.

[0026] The electrolyte circulation system includes an electrolyte source and a micro pump for driving the electrolyte flow, wherein the electrolyte source is connected to the electrolyte delivery channel of the rotating spindle and the liquid inlet at the lower end of the tubular electrode through pipelines, and the micro pump is arranged on the flow path of the electrolyte;

[0027] The DC power supply is provided with a programmable switch;

[0028] The rotary motor, micro pump and programmable switch are all electrically connected to the control system.

[0029] Preferably, the Z-axis fixing portion is provided with a tubular electrode guiding mechanism, and the tubular electrode guiding mechanism includes a vertical fixing member and a horizontal fixing member connected to each other, and the horizontal fixing member is provided with a guide for providing guidance for the tubular electrode.

[0030] Compared with the prior art, the present invention has achieved the following technical effects:

[0031] By dividing the outer circumferential surface of the tubular electrode body into a conductive area and an insulating area, when the conductive area is facing the surface to be processed of the workpiece, the power is turned on, an electric field is formed, and the surface of the workpiece is processed; when the conductive area of ​​the tubular electrode is rotated out of the surface to be processed of the workpiece, the power is disconnected, the electric field disappears, and the processing of the workpiece surface is stopped; the continuous electrolysis state is optimized to an intermittent electrolysis state, which reduces power consumption while being conducive to controlling the electric field environment and reducing related effects such as uncontrollable stray corrosion.

[0032] Flushing begins when the outlet port faces the workpiece surface to be machined, and ends when the insulating area rotates away from the workpiece surface to be machined. A control circuit controls the electrolyte pipeline's on-off function, periodically flushing the workpiece surface and changing the continuous liquid supply process to an intermittent one. Due to the small machining gap and large product volume, the flushing process effectively refreshes the electrolyte environment, controls the flow field, and reduces the range of the electric field.

[0033] The electric field is intermittently supplied, and the flow field is intermittently flushed. By coupling the electric field and the flow field, it is possible to achieve high localization control of the electric field and high localization flushing of the flow field in the processing area, as well as stray corrosion suppression in the non-processing area and the processed area, thereby obtaining a processing effect with high processing precision and high surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is a schematic structural diagram of the tubular electrode disclosed in the present invention;

[0036] Figure 2 for Figure 1 Structural diagram from another angle;

[0037] Figure 3 The process flow chart of a high-quality electrolytic finishing method using a tubular electrode with a conductive angle of 90° is shown;

[0038] Figure 4 The process flow chart of a high-quality electrolytic finishing method using a tubular electrode with a conductive angle of 180° is shown;

[0039] Figure 5 This is a simulation diagram of the current density for high-quality electrolytic finishing of tubular electrodes;

[0040] Figure 6 Schematic diagram of the outline of high-quality electrolytic finishing of tubular electrodes;

[0041] Figure 7 It is a structural schematic diagram of the processing device disclosed in the present invention;

[0042] Figure 8 for Figure 7 Circuit connection diagram;

[0043] Among them, 1. tubular electrode body; 2. conductive area; 3. insulating area; 4. liquid inlet hole; 5. liquid outlet hole; 6. horizontal fixing piece; 7. vertical fixing piece; 8. L-shaped machine tool; 9. Z-axis moving part; 10. mounting frame; 11. rotating motor; 12. spring chuck; 13. tubular electrode; 14. workpiece; 15. guide; 16. fixture; 17. electrolyte tank; 18. Y-axis moving part; 19. X-axis moving part; 20. control system; 21. programmable switch; 22. power supply. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] The purpose of the present invention is to provide a tubular electrode and its preparation method, electrolytic finishing method and device to solve the problems existing in the prior art, so as to control the range of electric field action and achieve high-quality electrolytic finishing.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] Please refer to Figure 1 and Figure 2 This embodiment provides a tubular electrode comprising a tubular electrode body 1. The tubular electrode body 1 is hollow, with inlet holes 4 at its upper and lower ends for electrolyte inflow, and outlet holes 5 formed on its sidewalls for electrolyte outflow. The outer circumference of the tubular electrode body 1 is divided into a conductive region 2 and an insulating region 3. The two sides of the conductive region 2 are parallel to the central axis of the tubular electrode body 1, and the outlet holes 5 are formed within the insulating region 3.

[0049] The operating principle of this embodiment is as follows: the tubular electrode 13 can be divided into four regions along its circumference, each defined as one of four machining states, corresponding to four circumferential angles: the central angle corresponding to the conductive region 2 is the conduction angle, the central angle corresponding to the liquid outlet 5 is the drainage angle, and the central angle corresponding to the two insulating regions 3 between the conductive region 2 and the liquid outlet 5 is the insulation coverage angle. The state where the ends of the conductive region 2 of the tubular electrode 13 overlap the normal of the workpiece 14 to be machined is defined as the powered-on electrolysis state; the state where the ends of the liquid outlet 5 overlap the normal of the workpiece 14 to be machined is defined as the powered-off electrolyte renewal state; and the remaining two states are powered-off transition states. The tubular electrode 13 rotates continuously, and intermittent supply of electric and fluid fields is achieved in conjunction with a control system 20. For different part structures, the power supply's programmable switch 21 and its control system 20 are used to fit the trajectory of the part's contour to be finished and read the machine tool's real-time coordinates. During machining, power is applied only when the conductive region 2 of the tubular electrode 13 and the part's surface to be finished are aligned in their normal direction.

[0050] During use, the tubular electrode 13 is connected to the negative pole of the power supply 22, and the workpiece 14 to be processed is connected to the positive pole of the power supply 22. The power supply 22 adopts a DC power supply. Combined with the electrolyte in the electrolyte tank 17 that immerses the workpiece 14 and the tubular electrode 13, the conductive area 2 of the tubular electrode body 1 not covered by the insulating layer is used to provide an electric field, and the surface to be processed of the workpiece 14 is finished based on the principle of electrochemical anodic dissolution.

[0051] During machining, tubular electrode 13 rotates continuously and workpiece 14 is fed forward. When conductive region 2 of tubular electrode 13 faces the normal of the workpiece 14 surface to be machined, power is turned on, forming an electric field and machining the surface of workpiece 14. When conductive region 2 of tubular electrode 13 rotates out of the normal of the workpiece 14 surface to be machined, power is turned off, the electric field disappears, and machining of the workpiece 14 surface ceases. By dividing the outer circumferential surface of tubular electrode 13 into insulating region 3 and conductive region 2, the current density can be effectively concentrated in the process where conductive region 2 faces workpiece 14 by controlling the on / off of power supply 22, while no ineffective electric field is generated in other processes. This achieves convergence of the electric field, suppresses corrosion of workpiece 14 by stray electric fields, and achieves highly localized electrolytic finishing of the surface of workpiece 14.

[0052] The hollow interior of tubular electrode 13 is used to circulate electrolyte. Liquid inlets 4 at the top and bottom allow the electrolyte to flow in, while liquid outlets 5 on the sidewall allow the electrolyte to flow from the top and bottom ends to the center and then out. When tubular electrode 13 rotates until one end of outlet 5 is facing the normal to the workpiece 14's surface to be machined, electrolyte flushing begins. When the other end is rotated out of the normal to the workpiece 14's surface to be machined, electrolyte flushing is stopped. This flushing process effectively refreshes the electrolyte environment, controls the flow field, and reduces the range of the electric field.

[0053] By coupling the electric field and the flow field, intermittently supplying the electric field and intermittently flushing the flow field, the electrolytic power-on processing state and the electrolytic power-off flushing state are effectively separated. This can achieve high localization control of the electric field and high localization flushing of the flow field in the processing area, inhibit stray corrosion in the non-processing area and the processed area, and update the electrolyte in time to obtain processing results with high processing precision and high surface quality.

[0054] The separation of the conductive region 2 and insulating region 3 on the outer circumferential surface of the tubular electrode body 1 is achieved by providing an insulating layer on a portion of the outer circumferential surface of a conventional tubular electrode. The portion provided with the insulating layer is the insulating region 3, while the portion not provided with the insulating layer is the non-conductive region 2. The conductive region 2 preferably has a conduction angle of 30° to 180°, with the specific value adjusted based on the machining surface quality and efficiency.

[0055] As a preferred embodiment of this embodiment, the liquid outlet holes 5 can be provided as a plurality of holes arranged in an array. The starting and ending points of the liquid outlet hole array during rotation are the start and end times of the liquid discharge process. The aperture size and tilt angle of the liquid outlet holes 5 are adjusted based on the uniform liquid discharge rate of the array holes, so as to ensure that the electrolyte can be stably flushed to the surface of the workpiece 14 and flush the processed products.

[0056] Example 2

[0057] This embodiment provides a method for preparing a tubular electrode, which is used to prepare the tubular electrode described in Example 1, comprising the following steps:

[0058] S1. Use ordinary tubular electrodes as raw materials for electrophoresis insulation;

[0059] S2. Processing the liquid hole 5 on the side wall of the tubular electrode body 1;

[0060] S3. Scrape off part of the insulating layer on the outer circumferential surface of the tubular electrode body 1.

[0061] The conventional tubular electrode used is a hollow metal tube with a length greater than the machining thickness of the workpiece 14 and a radius less than the minimum arc radius of the workpiece 14. First, the outer wall of the tubular electrode is electrically insulated using electrophoretic insulation technology. Next, a liquid outlet 5 is opened in the side wall of the tubular electrode using mechanical micro-drilling or laser drilling. Finally, a portion of the insulating coating is removed from the entire area outside the liquid outlet 5, forming the conductive area 2 of the tubular electrode 13 for applying an electric field.

[0062] Example 3

[0063] Please refer to Figures 3 and 4 This embodiment provides a method for electrolytic finishing using the tubular electrode described in the first embodiment, comprising the following steps:

[0064] S1. The workpiece 14 is fixed to the fixture 16 in the electrolyte tank 17 on the machine, the tubular electrode 13 is connected to the negative electrode of the power supply 22, and the workpiece 14 is connected to the positive electrode of the power supply 22;

[0065] S2. The tubular electrode 13 is continuously rotated by the rotating motor 11, and the workpiece 14 is fed along its contour to be processed by the machine;

[0066] S3. When the rotation ends until the starting end of the conductive region 2 coincides with the normal of the surface to be machined of the workpiece 14, the power supply 22 is turned on; when the rotation ends until the ending end of the conductive region 2 coincides with the normal of the surface to be machined of the workpiece 14, the power supply 22 is turned off; when the rotation ends until one end of the liquid outlet 5 coincides with the normal of the surface to be machined of the workpiece 14, the electrolyte flushing is performed; when the rotation ends until the other end of the liquid outlet 5 coincides with the normal of the surface to be machined of the workpiece 14, the electrolyte flushing is turned off;

[0067] S4 repeats S3 until the workpiece 14 to be processed surface processing is completed;

[0068] S5. Separate and clean the workpiece 14 and the tubular electrode 13.

[0069] As a preferred solution of this embodiment, the rotation speed of the tubular electrode 13 is 60-120 rpm, and the feed speed of the workpiece 14 is 5*10 -7 m / s-8*10 -7 The initial machining gap between the tubular electrode 13 and the surface of the workpiece 14 to be machined is 0.02-0.04 mm.

[0070] For the simulation results of electrolytic finishing using the above method, please refer to Figure 5 and Figure 6 .

[0071] Figure 5The current density model of a certain point when the tubular electrode 13 is subjected to electrolytic finishing at different conduction angles of 30° to 180° is shown.

[0072] Figure 6 The figure shows the contour deformation simulation of the workpiece 14 when the machining is completed for 20 seconds using tube electrodes with different conductive angles.

[0073] The specific simulation conditions are shown in Table 1:

[0074]

[0075] Table 1

[0076] The tubular electrode 13 rotates continuously and the workpiece 14 is fed continuously, so that the current density can be effectively concentrated in the state where the conductive area 2 faces the workpiece 14, thereby achieving the convergence of the electric field, inhibiting stray corrosion and reducing repeated processing of the processed area. Figure 6 The simulation data of the machining depth of the workpiece 14 at different conductive angles is shown, including finishing at different conductive angles of 30°-180°, and continuous finishing without any treatment of a normal tubular electrode (i.e., a conductive angle of 360°). In the data of the simulation results, it can be clearly observed that the conductive angle and the machining depth show a significant positive correlation. In addition, the high-quality electrolytic finishing provided by this embodiment is comparable to the electrolytic finishing without an insulating coating ( Figure 6 By comparing with the simulation data of 360° machining angle in the middle, it can be clearly observed that the machining depth is effectively controlled, the localization is better, and the precision electrolytic finishing effect is achieved.

[0077] Example 4

[0078] Please refer to Figure 7 This embodiment provides a processing device for the processing method described in Example 3, including an electrolytic machine tool, a DC power supply, an electrolyte circulation system and a control system 20.

[0079] The electrolysis machine includes a Z-axis motion part 9 for mounting a rotary motor 11 and an XY-axis motion part for feeding a workpiece 14 . The XY-axis motion part is provided with a fixture 16 for fixing the workpiece 14 and an electrolyte tank 17 . The fixture 16 is located inside the electrolyte tank 17 .

[0080] The tubular electrode 13 is fixedly mounted on the output end of the rotating main shaft of the rotating motor 11. An electrolyte delivery channel is provided inside the rotating main shaft. The hollow interior of the tubular electrode 13 is connected to the electrolyte delivery channel through the liquid inlet 4 at the upper end.

[0081] The electrolyte circulation system includes an electrolyte source and a micropump that drives the flow of the electrolyte. The electrolyte is drawn out through the micropump and divided into two streams by a diverter. The two streams are respectively sent into the electrolyte delivery channel of the rotating spindle and the liquid inlet at the lower end of the tubular electrode 13 through the electrolyte delivery pipeline. The micropump is set on the flow path of the electrolyte.

[0082] The DC power supply is provided with a programmable switch 21 , and the rotary motor 11 , the micro pump and the programmable switch 21 are all electrically connected to the control system 20 .

[0083] Specifically, the electrolytic machine tool includes an L-shaped machine tool 8 .

[0084] The vertical portion of the L-shaped machine tool 8 is movably mounted with a Z-axis motion unit 9, which is provided with a mounting bracket 10. A rotary motor 11 is mounted on the mounting bracket 10. A tubular electrode 13 is mounted to the output end of the rotating spindle of the rotary motor 11 via a spring chuck 12. An electrolyte delivery channel is provided within the rotating spindle. The liquid inlet 4 at the upper end of the tubular electrode 13 is connected to the electrolyte delivery channel. A sealing structure can also be provided at the connection between the two to prevent electrolyte leakage. The liquid inlet 4 at the lower end of the tubular electrode 13 is connected to the electrolyte delivery pipeline via a rotary pipe joint, so that the tubular electrode 13 rotates during machining while the delivery pipeline remains stationary.

[0085] An X-axis moving section 19 is movably mounted on the horizontal portion of the L-shaped machine tool 8. A Y-axis moving section 18 is movably mounted on the X-axis moving section 19. The X-axis moving section 19 and the Y-axis moving section 18 form an XY-axis moving section. An electrolytic cell is fixedly mounted on the Y-axis moving section 18, and a fixture 16 for a workpiece 14 is disposed within the electrolytic cell.

[0086] The X-axis motion unit 19, the Y-axis motion unit 18, and the Z-axis motion unit 9 can achieve relative motion through conventional motion mechanisms, such as guide rails, lead screws, or other mechanisms capable of achieving the same function. The X-axis motion unit 19, the Y-axis motion unit 18, and the Z-axis motion unit 9 are each provided with a respective drive mechanism, and each drive mechanism is electrically connected to the control system 20.

[0087] Please refer to the circuit connection diagram of the rotating motor 11, micro pump and programmable switch 21 and the control system 20 for the electrical connection diagram. Figure 8 .

[0088] In operation, firstly, the relative positions of the X-axis moving part 19, the Y-axis moving part 18 and the Z-axis moving part 9 are adjusted by the control system 20, so that the working surface of the tubular electrode 13 is opposite to the surface to be machined of the workpiece 14. After starting machining, the tubular electrode 13 is rotated under the driving of the rotary motor 11. During rotation, the XY-axis moving part drives the workpiece 14 to feed according to the profile of the surface to be machined. The programmable switch 21 of the power supply and the control system 20 are used to fit the trajectory of the profile to be finished of the part, read the real-time coordinates of the machine tool, and realize adaptive adjustment of the power supply conduction angle of the conductive area 2 of the tubular electrode 13 through trajectory tracking of the finished profile, so that the conductive area 2 of the tubular electrode 13 and the surface to be finished of the part are only in the state of normal alignment during machining, and the power supply is connected to perform electrolytic machining.

[0089] As a preferred scheme of the embodiment, the Z-axis fixed part is provided with a tubular electrode guiding mechanism, which comprises a vertical fixing member 7 and a horizontal fixing member 6 connected with each other. The vertical fixing member 7 is installed on the mounting frame 10, and the horizontal fixing member 6 is provided with a guide 15 for guiding the tubular electrode 13. The number of the vertical fixing member 7 and the horizontal fixing member 6 is at least one. In the embodiment, one vertical fixing member 7 and two horizontal fixing members 6 are adopted, and the two horizontal fixing members 6 are respectively provided with the guide 15 corresponding in the axial direction. During installation, the tubular electrode 13 is first inserted through the two guides 15, and then is installed on the rotating spindle of the rotary motor 11 through the spring collet 12. By providing the tubular electrode guiding mechanism, the overall coaxiality and stability of the tubular electrode 13 in the axial direction during operation can be ensured.

[0090] The adaptive changes according to actual needs are within the protection scope of the application.

[0091] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An electrolytic finishing method, characterized in that: A tubular electrode is used, comprising a hollow tubular electrode body. The tubular electrode body has inlet holes for electrolyte inflow at its upper and lower ends, and outlet holes for electrolyte outflow on its sidewalls. The outer circumference of the tubular electrode body is divided into a conductive region and an insulating region, with both sides of the conductive region parallel to the central axis of the tubular electrode body. The outlet hole is located in the insulating region. The processing method comprises the following steps: S1. The workpiece is fixed to the fixture in the electrolyte tank on the machine, the tubular electrode is connected to the negative electrode of the power supply, and the workpiece is connected to the positive electrode of the power supply; S2. The tubular electrode is continuously rotated by the rotating motor, and the workpiece is fed along its contour to be processed by the machine; S3. When the rotation ends until the starting end of the conductive region is aligned with the normal direction of the workpiece surface to be machined, turning on the DC power supply; when the rotation ends until the ending end of the conductive region is aligned with the normal direction of the workpiece surface to be machined, turning off the DC power supply; when the rotation ends until one end of the liquid outlet is aligned with the normal direction of the workpiece surface to be machined, performing electrolyte flushing; when the rotation ends until the other end of the liquid outlet is aligned with the normal direction of the workpiece surface to be machined, turning off the electrolyte flushing; S4. Repeat S3 until the workpiece surface to be processed is completed; S5. Separate and clean the workpiece and tubular electrode.

2. The electrolytic finishing method according to claim 1, characterized in that: The central angle corresponding to the conductive area is a conductive angle, and the conductive angle is 30°-180°.

3. The electrolytic finishing method according to claim 1, wherein: The insulating region is coated with an insulating layer.

4. The electrolytic finishing method according to claim 1, wherein: The liquid outlet holes are multiple and arranged in an array.

5. The electrolytic finishing method according to claim 1, wherein: The rotation speed of the tubular electrode is 60-120 rpm, and the feed speed of the workpiece is 5*10-7 m / s-8*10-7 m / s.

6. The electrolytic finishing method according to claim 1, characterized in that: The initial machining gap between the tubular electrode and the surface to be machined of the workpiece is 0.02-0.04 mm.

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