An electrolytic machining device for variable-diameter holes

Abstract

The present invention relates to the field of electro - machining technology, and particularly to an electrolytic machining device for variable - diameter holes. The machining device includes a tool electrode, a pulse power supply, an electrolyte circulation system, a tool electrode feeding unit, a tool electrode rotating unit, and an electrode variable - diameter control unit. The tool electrode is connected to the electrode variable - diameter control unit, the electrode variable - diameter control unit is connected to the tool electrode feeding unit, the tool electrode feeding unit is connected to the tool electrode rotating unit. The tool electrode includes a cylindrical upper section and a lower section, and the cylindrical upper section and the lower section are connected by a flexible material. The lower section is composed of a plurality of conductive blocks and a plurality of flexible expansion blocks, and the plurality of conductive blocks and the plurality of flexible expansion blocks are arranged at intervals in a circumferential array. The present invention realizes the electro - machining of variable - diameter holes by controlling the change of the electrode diameter, avoiding the problem of local short - circuit caused by the breakdown of the machining gap due to the increase of the machining voltage during the machining of variable - diameter holes by adjusting the machining voltage in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical machining, and in particular, to an electrochemical machining device. Background Art

[0002] In the prior art, when machining a variable-diameter hole by electrochemical machining, the size variation control of the micro-hole is generally achieved by adjusting the machining voltage. However, since the machining voltage increases during the machining process, it is easy to break down the machining gap between the tool electrode and the workpiece, resulting in a short circuit between the tool electrode and the workpiece, and causing burns to the tool electrode and the workpiece. Therefore, it is necessary to further improve the existing method for machining variable-diameter holes by electrochemical machining. Summary of the Invention

[0003] The object of the present invention is to provide an electrochemical machining device, which solves the problems raised in the technical background.

[0004] To achieve the above object, the present invention adopts the following technical solution: An electrochemical machining device, the machining device includes a pulse power supply, an electrolyte circulation system, and further includes a tool electrode. The tool electrode is connected to an electrode variable-diameter control unit, the electrode variable-diameter control unit is connected to the tool electrode feeding unit, and the tool electrode feeding unit is connected to the tool electrode rotating unit;

[0005] The tool electrode includes a cylindrical upper section and a lower section. The cylindrical upper section and the lower section are connected by a flexible material. The lower section is composed of a plurality of conductive blocks and a plurality of flexible expansion blocks. The plurality of conductive blocks and the plurality of flexible expansion blocks are circumferentially and arrayed at intervals; a moving part is provided at the bottom end of the lower section of the tool electrode; the moving part includes a sealing block at the upper part and a frustum-shaped conductor at the lower part; the sealing block is fixedly connected to the frustum-shaped conductor, the sealing block is in sealed sliding connection with the inner cavity of the conductive block, a pull rod is provided at the top end of the sealing block, and the pull rod passes through the cavity inside the lower section and is connected to the electrode variable-diameter control unit; the frustum-shaped conductor is movably connected to the inner wall of the conductive block, and the frustum-shaped conductor is adapted to the inner cavity at the end of the lower section;

[0006] The conductive blocks, the plurality of flexible expansion blocks, and the sealing block frustum-shaped conductor together form a cooling cavity;

[0007] During the downward feeding process of the tool electrode, by controlling the contraction length l of the pull rod, the size of the aperture d of the target hole at the machining depth h of the tool electrode is controlled in real time. The control relationship is:

[0008] where l is the contraction length of the pull rod;

[0009] h is the feeding depth of the tool electrode in the workpiece;

[0010] d is the aperture of the target hole when the tool electrode is at the machining depth h;

[0011] d0 is the initial value of the electrode diameter;

[0012] α is the cone angle of the frustum-shaped conductor.

[0013] As a preferred technical solution of the present invention, the electrode diameter-changing control unit includes a fixing plate, the fixing plate is fixedly connected to the top end of the cylindrical upper section through a support rod, an electric telescopic rod is provided on the fixing plate, and the electric telescopic rod is fixedly connected to the top end of the pull rod.

[0014] As a preferred technical solution of the present invention, the electrolyte circulation system includes an electrolyte return pipe, the electrolyte return pipe is communicated with an electrolyte filtering part, the electrolyte filtering part is communicated with an electrolyte cooling part, the electrolyte cooling part is communicated with an electrolyte storage tank, and the electrolyte storage tank is communicated with an electrolyte supply part.

[0015] As a preferred technical solution of the present invention, there is circulating electrolyte in the cavity, an upper cover body is provided at the top end of the cavity, the upper cover body is provided with a first round hole and a second round hole, the first round hole is communicated with the electrolyte supply part of the electrolyte circulation system through a first flow regulating solenoid valve, and the second round hole is communicated with the electrolyte return pipe through a second flow regulating solenoid valve.

[0016] As a preferred technical solution of the present invention, during each pulse intermittent gap time, the control system controls the electrolyte in the cavity to be updated. Specifically, the control system controls the first flow regulating solenoid valve and the second flow regulating solenoid valve to open, and makes the first flow regulating solenoid valve and the second flow regulating solenoid valve maintain the same flow opening degree.

[0017] As a preferred technical solution of the present invention, the cylindrical upper section is made of a hard non-conductive material or a hard conductive material with an insulating layer wrapped outside, and the conductive block is made of a non-flexible conductive material.

[0018] As a preferred technical solution of the present invention, the circumferential side surface of the frustum-shaped conductor is coated with an insulating material, the bottom end surface diameter length of the frustum-shaped conductor is greater than the top end surface diameter length, and the bottom end surface diameter length of the frustum-shaped conductor is less than the diameter length corresponding to the lower section at this moment when the frustum-shaped conductor is completely in the extended state.

[0019] As a preferred technical solution of the present invention, the inner cavity shape at the end of the lower section is in a horn shape, and the horn shape fits the side surface of the frustum-shaped conductor.

[0020] As a preferred technical solution of the present invention, the bottom end height of the conductive block is lower than the height of the flexible expansion block.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. Through the mutual cooperation among the frustum-shaped conductor, the conductive block, and the tool electrode feeding unit, etc., the present invention realizes the electrical machining of variable-diameter holes by controlling the method of changing the diameter of the tool electrode, avoiding the problem of local short circuit caused by the breakdown of the machining gap due to the increase of the machining voltage during the machining of variable-diameter holes in the prior art.

[0023] 2. Through the mutual cooperation among the frustum-shaped conductor, the conductive block, and the tool electrode feeding unit, etc., the present invention controls the contraction length l of the pull rod; makes the contraction length l of the pull rod change from the state of l > 0 to the state of l = 0, and during the process of the contraction length l of the pull rod changing from the state of l > 0 to the state of l = 0, under the action of the flexible expansion block, the conductive block of the lower segment contracts inward, thereby increasing the gap between the conductive block and the workpiece to be machined. Due to the increase of the machining gap, the electrolyte and electrolytic products can be better discharged from the machining gap, promoting the rapid replacement of the electrolyte in the machining gap and the discharge of electrolytic products, and thus improving the machining efficiency and machining quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 Three-dimensional structure schematic diagram of the tool electrode, tool electrode feeding unit, tool electrode rotating unit, and pull rod telescoping unit of the present invention;

[0026] Figure 2 Front view structure schematic diagram of the tool electrode, tool electrode feeding unit, tool electrode rotating unit, and pull rod telescoping unit of the present invention;

[0027] Figure 3 For the present invention Figure 2 Structure sectional view;

[0028] Figure 4 Three-dimensional structure schematic diagram of the tool electrode of the present invention;

[0029] Figure 5 Front view structure schematic diagram of the tool electrode of the present invention;

[0030] Figure 6 For the present invention Figure 5 Sectional view structure schematic diagram along line A - A;

[0031] Figure 7 For the present invention Figure 5 Schematic cross-sectional structure diagram along line B-B;

[0032] Figure 8 For the present invention Figure 5 Schematic cross-sectional structure diagram along line C-C;

[0033] Figure 9 Schematic cross-sectional structure diagram of the moving part of the present invention;

[0034] Figure 10 Schematic diagram of electrochemical machining of the present invention.

[0035] In the figure: 1. Tool electrode; 101. Cylindrical upper section body; 102. Lower section body; 103. Conductive block; 104. Flexible expansion block; 105. Frustum-shaped conductor; 106. Cavity; 107. Pull rod; 108. Upper cover body; 109. First round hole; 110. Second round hole; 111. First flow rate regulating solenoid valve; 112. Second flow rate regulating solenoid valve; 113. Moving part; 114. Sealing block; 2. Pulse power supply; 3. Electrolyte circulation system; 301. Electrolyte supply part; 302. Electrolyte return pipe; 303. Electrolyte filtration part; 304. Electrolyte cooling part; 305. Electrolyte storage tank; 4. Tool electrode feeding unit; 5. Tool electrode rotating unit; 6. Electrode diameter-changing control unit. Specific embodiments

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Referring to Figure 1-10 , an electrochemical machining device provided by the present invention, the machining device includes a pulse power supply 2 and an electrolyte circulation system 3, and further includes a tool electrode 1. The tool electrode 1 is connected to an electrode diameter-changing control unit 6, the electrode diameter-changing control unit 6 is connected to a tool electrode feeding unit 4, and the tool electrode feeding unit 4 is connected to a tool electrode rotating unit 5;

[0038] The tool electrode 1 includes a cylindrical upper section 101 and a lower section 102. The cylindrical upper section 101 and the lower section 102 are connected by a flexible material. The lower section 102 is composed of a plurality of conductive blocks 103 and a plurality of flexible expansion blocks 104. The plurality of conductive blocks 103 and the plurality of flexible expansion blocks 104 are distributed at intervals in a circumferential array. A moving part 113 is provided at the bottom end of the lower section 102 of the tool electrode 1. The moving part 113 includes a sealing block 114 at the upper part and a frustum-shaped conductor 105 at the lower part. The sealing block 114 is fixedly connected to the frustum-shaped conductor 105. The sealing block 114 is in sealed sliding connection with the inner cavity of the conductive block 103. A pull rod 107 is provided at the top end of the sealing block 114. The pull rod 107 passes through the cavity inside the lower section 102 and is connected to the electrode diameter change control unit 6. The frustum-shaped conductor 105 is movably connected to the inner wall of the conductive block 103 and is adapted to the inner cavity at the end of the lower section 102. The shape of the inner cavity at the end of the lower section 102 is a trumpet shape, and the trumpet shape fits the side surface of the frustum-shaped conductor 105.

[0039] The conductive block 103, the plurality of flexible expansion blocks 104, and the sealing block 114 and the frustum-shaped conductor 105 together form a cooling cavity 106.

[0040] During the downward feeding process of the tool electrode 1, by controlling the contraction length l of the pull rod 107, the size of the aperture d of the target hole at the machining depth h of the tool electrode 1 is controlled in real time. The control relationship is:

[0041]

[0042] where l is the contraction length of the pull rod;

[0043] h is the feeding depth of the tool electrode 1 inside the workpiece being machined;

[0044] d is the aperture of the target hole at the machining depth h of the tool electrode 1;

[0045] d0 is the initial value of the electrode diameter;

[0046] α is the cone angle of the frustum-shaped conductor 105.

[0047] The electrode diameter change control unit 6 includes a fixing plate. The fixing plate is fixedly connected to the top end of the cylindrical upper section 101 through a support rod. An electric telescopic rod is provided on the fixing plate. The fixing plate is connected to the tool electrode feeding unit 4. The electric telescopic rod is fixedly connected to the top end of the pull rod 107. By controlling the extension and contraction of the telescopic rod, the extension and contraction of the pull rod 107 are realized. By controlling the extension and contraction of the electric telescopic rod, the frustum-shaped conductor 105 is controlled to enter or exit the cavity of the lower section 102 by the pull rod 107, so that the conductive block 103 expands or contracts outward.

[0048] The electrolyte circulation system 3 includes an electrolyte return pipe 302. The electrolyte return pipe 302 is communicated with an electrolyte filtering part 303. The electrolyte filtering part 303 is communicated with an electrolyte cooling part 304. The electrolyte cooling part 304 is communicated with an electrolyte storage tank 305. The electrolyte storage tank 305 is communicated with an electrolyte supply part 301. The electrolyte supply part 301 supplies electrolyte into the machining gap between the tool electrode 1 and the workpiece to be machined and into the cooling cavity 106, so as to update the electrolyte, reduce the temperature of the electrolyte, discharge electrolytic products at the same time, and ensure the normal progress of the electrochemical reaction.

[0049] There is circulating electrolyte in the cooling cavity 106. The top end of the cooling cavity 106 is provided with an upper cover body 108. The upper cover body 108 is provided with a first round hole 109 and a second round hole 110. The first round hole 109 is communicated with the electrolyte supply part 301 of the electrolyte circulation system 3 through a first flow regulating solenoid valve 111. The second round hole 110 is communicated with the electrolyte return pipe 302 through a second flow regulating solenoid valve 112.

[0050] During each pulse intermittent gap time, the control system controls the update of the electrolyte in the cooling cavity 106. Specifically, the control system controls the first flow regulating solenoid valve 111 and the second flow regulating solenoid valve 112 to open, and keeps the first flow regulating solenoid valve 111 and the second flow regulating solenoid valve 112 at the same flow opening degree.

[0051] The cylindrical upper section body 101 is made of a hard non-conductive material or made of a hard conductive material with an insulating layer coated on the outside. The conductive block 103 is made of a non-flexible conductive material.

[0052] The circumferential side surface of the frustum-shaped conductor 105 is coated with an insulating material. The bottom end face diameter length of the frustum-shaped conductor 105 is greater than the top end face diameter length, and the bottom end face diameter length of the frustum-shaped conductor 105 is less than the corresponding diameter length of the lower section body 102 at the moment when the frustum-shaped conductor 105 is completely in the extended state. By coating the circumferential side surface of the frustum-shaped conductor 105 with an insulating material, it is prevented that the side wall of the frustum-shaped conductor 105 is consumed during the electric machining process, and the influence on the machining accuracy due to the consumption of the side wall of the frustum-shaped conductor 105 is avoided.

[0053] The bottom end height of the conductive block 103 is lower than the height of the flexible expansion block 104. It is prevented that the conductive block 103 is consumed during the electric machining process, and the influence on the machining accuracy due to the consumption of the conductive block 103 is avoided.

[0054] The tool electrode 1 is electrically connected to the negative electrode of the pulse power supply 2, and the workpiece to be machined is electrically connected to the positive electrode of the pulse power supply 2.

[0055] During use, the workpiece to be processed is installed on the fixture, and the workpiece to be processed is electrically connected to the positive electrode of the pulse power supply 2, while the tool electrode 1 is electrically connected to the negative electrode of the pulse power supply 2; the electrolyte circulation system 3 is turned on, so that the electrolyte supply unit 301 supplies electrolyte into the machining gap between the tool electrode 1 and the workpiece to be processed and into the cooling cavity 106, and the electrolyte circulation system 3 keeps the electrolyte pressure constant; the pulse power supply 2 is turned on, and the pulse power supply 2 outputs a pulsed current. The tool electrode feeding unit 4 and the tool electrode rotating unit 5 control the downward feeding and rotation of the tool electrode 1. The contact point between the tool electrode 1 and the workpiece to be processed is used as the initial position of the machining depth h, that is, h = 0; during the downward feeding of the tool electrode 1, by controlling the contraction length l of the pull rod 107, the size of the aperture d of the target hole at the machining depth h of the tool electrode (1) is controlled in real time. The control relationship is:

[0056] where l is the contraction length of the pull rod;

[0057] h is the feeding depth of the tool electrode 1 in the workpiece to be processed;

[0058] d is the aperture of the target hole at the machining depth h of the tool electrode 1;

[0059] d0 is the initial value of the electrode diameter;

[0060] α is the cone angle of the frustum-shaped conductor 105;

[0061] The tool electrode feeding unit 4 controls the feeding speed and machining duration of the tool electrode 1 for the target hole, thereby completing the electrolytic machining of the target hole.

[0062] It should be emphasized that the origin of the collaborative control relationship of the machining parameters is as follows. Let the cone angle of the frustum-shaped conductor 105 be α, let the contraction length of the pull rod be l, and let the diameter of the conductive block 103 increase by D. Then Let the initial value of the electrode diameter be d0, and let the aperture of the target hole at the machining depth h of the tool electrode 1 be d. Then the contraction length of the pull rod is

[0063] During the downward feeding of the tool electrode 1, the contraction length l of the pull rod 107 changes according to the control law, that is, the contraction length l of the pull rod 107 changes with the change of the aperture d of the target hole corresponding to the machining depth h, thereby realizing the electrical machining of the variable-diameter hole.

[0064] When controlling the contraction of the pull rod 107, driving the frustum-shaped conductor 105 into the cavity inside the lower section 102 causes the conductive block 103 of the lower section 102 to expand outward, thereby increasing the machining diameter of the tool electrode and realizing the machining of the variable-diameter hole.

[0065] During each pulse intermittent gap time, the control system controls the electrolyte in the cavity 1 to be updated. Specifically, the control system controls the first flow regulating solenoid valve 111 and the second flow regulating solenoid valve 112 to open, and keeps the first flow regulating solenoid valve 111 and the second flow regulating solenoid valve 112 at the same flow opening degree; thereby realizing the update of the electrolyte in the cooling cavity 106 and cooling the conductive block 103.

[0066] In the above electro - machining process, the electro - machining of variable - aperture is realized by controlling and changing the diameter of the electrode, avoiding the problem of local short - circuit caused by the breakdown of the machining gap due to the increase of the machining voltage during the hole - machining process of variable - aperture by adjusting the machining voltage in the prior art.

[0067] During each pulse intermittent gap, the control system controls the contraction length l of the pull rod 107; the contraction length l of the pull rod 107 changes from the state of l>0 to the state of l = 0. During the process of the contraction length l of the pull rod 107 changing from the state of l>0 to the state of l = 0, since the pull rod 13 pushes the frustum - shaped conductor 105 out of the cooling cavity 106, under the action of the flexible expansion block 104, the conductive block 103 of the lower segment body 102 contracts inwards, thus increasing the gap between the conductive block 103 and the workpiece to be machined. Due to the increase of the machining gap, the electrolyte and electrolytic products can be better discharged from the machining gap, promoting the rapid replacement of the electrolyte in the machining gap and the discharge of electrolytic products, and then improving the machining efficiency and machining quality. Through the mutual cooperation between the frustum - shaped conductor 105, the conductive block 103 and the tool electrode feed unit 4, etc., by controlling the contraction length l of the pull rod 107; the contraction length l of the pull rod 107 changes from the state of l>0 to the state of l = 0, and during the process of the contraction length l of the pull rod 107 changing from the state of l>0 to the state of l = 0, the frustum - shaped conductor 105 pre - machines the area to be machined at the bottom end. After the pre - machining of the area to be machined at the bottom end by the frustum - shaped conductor 105 is completed, the contraction length l of the pull rod 107 resumes to the contraction length at the end of the previous pulse machining, when the frustum - shaped conductor 105 re - enters the cavity inside the lower segment body 102.

[0068] As described above, when the frustum-shaped conductor 105 enters the cavity inside the lower body 102, the conductive block 103 of the lower body 102 expands outward, thereby increasing the machining diameter of the tool electrode, and thus realizing the machining of a variable-diameter hole; when the frustum-shaped conductor 105 exits the cavity inside the lower body 102, under the action of the flexible expansion block 104, the conductive block 103 of the lower body 102 contracts inward, and the machining gap between the conductive block 103 and the workpiece to be machined increases, enabling the electrolyte and electrolytic products to be better discharged from the machining gap, promoting the rapid replacement of the electrolyte in the machining gap and the discharge of electrolytic products, and thus improving the machining efficiency and machining quality. After the frustum-shaped conductor 105 exits the cavity inside the lower body 102, the frustum-shaped conductor 105 pre-machines the area to be machined at the bottom end. After the frustum-shaped conductor 105 finishes pre-machining the area to be machined at the bottom end, after the frustum-shaped conductor 105 enters the cavity inside the lower body 102 again, the machining gap between the frustum-shaped conductor 105 and the area to be machined at the bottom end increases, enabling the electrolyte and electrolytic products in the machining gap between the frustum-shaped conductor 105 and the area to be machined at the bottom end to be better discharged from the machining gap, promoting the rapid replacement of the electrolyte in the machining gap and the discharge of electrolytic products, and thus improving the machining efficiency and machining quality.

[0069] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrolytic machining device, the machining device includes a pulsed power supply (2) and an electrolyte circulation system (3), characterized in that: It further includes a tool electrode (1), the tool electrode (1) is connected to an electrode diameter-changing control unit (6), the electrode diameter-changing control unit (6) is connected to a tool electrode feeding unit (4), and the tool electrode feeding unit (4) is connected to a tool electrode rotating unit (5); The tool electrode (1) includes a cylindrical upper section body (101) and a lower section body (102), the cylindrical upper section body (101) and the lower section body (102) are connected by a flexible material, and the lower section body (102) is composed of a plurality of conductive blocks (103) and a plurality of flexible expansion blocks (104). The plurality of conductive blocks (103) and the plurality of flexible expansion blocks (104) are distributed at intervals in a circumferential array; a moving part (113) is provided at the bottom end of the lower section body (102) of the tool electrode (1); the moving part (113) includes a sealing block (114) at the upper part and a frustum-shaped conductor (105) at the lower part; the sealing block (114) is fixedly connected to the frustum-shaped conductor (105), the sealing block (114) is in sealed sliding connection with the inner cavity of the conductive block (103), a pull rod (107) is provided at the top end of the sealing block (114), and the pull rod (107) passes through the cavity inside the lower section body (102) and is connected to the electrode diameter-changing control unit (6); the frustum-shaped conductor (105) is movably connected to the inner wall of the conductive block (103), and the frustum-shaped conductor (105) is adapted to the inner cavity at the end of the lower section body (102); The conductive block (103), the plurality of flexible expansion blocks (104) and the sealing block (114) and the frustum-shaped conductor (105) together form a cooling cavity (106); During the downward feed of the tool electrode (1), by controlling the contraction length l of the pull rod (107), the size of the aperture d of the target hole at the machining depth h of the tool electrode (1) is controlled in real time. The control relationship is as follows: ; Wherein, l is the contraction length of the pull rod; h is the feeding depth of the tool electrode (1) in the workpiece being machined; d is the aperture of the target hole when the tool electrode (1) is at the machining depth h; d0 is the initial value of the electrode diameter; α is the cone angle of the frustum-shaped conductor (105); There is circulating electrolyte in the cooling cavity (106). The top end of the cooling cavity (106) is provided with an upper cover body (108). The upper cover body (108) is provided with a first round hole (109) and a second round hole (110). The first round hole (109) is communicated with the electrolyte supply part (301) of the electrolyte circulation system (3) through a first flow regulating solenoid valve (111), and the second round hole (110) is communicated with the electrolyte return pipe (302) through a second flow regulating solenoid valve (112).

2. The electrolytic machining device according to claim 1, characterized in that: The electrode diameter-changing control unit (6) includes a fixing plate. The fixing plate is fixedly connected to the top end of the cylindrical upper section body (101) through a support rod. An electric telescopic rod is provided on the fixing plate, and the electric telescopic rod is fixedly connected to the top end of the pull rod (107).

3. The electrolytic machining device according to claim 1, characterized in that: The electrolyte circulation system (3) includes an electrolyte return pipe (302), the electrolyte return pipe (302) communicates with an electrolyte filtration unit (303), the electrolyte filtration unit (303) communicates with an electrolyte cooling unit (304), the electrolyte cooling unit (304) communicates with an electrolyte storage tank (305), and the electrolyte storage tank (305) communicates with an electrolyte supply unit (301).

4. The electrolytic machining device according to claim 1, characterized in that: During each pulse intermittent gap time, the control system controls the update of the electrolyte in the cooling chamber (106). Specifically, the control system controls the first flow rate regulating solenoid valve (111) and the second flow rate regulating solenoid valve (112) to open, and keeps the first flow rate regulating solenoid valve (111) and the second flow rate regulating solenoid valve (112) at the same flow rate opening degree.

5. The electrolytic machining device according to claim 1, characterized in that: The cylindrical upper section body (101) is made of a hard non-conductive material or made of a hard conductive material with an insulating layer coated on the outside, and the conductive block (103) is made of a non-flexible conductive material.

6. The electrolytic machining device according to claim 1, characterized in that: The circumferential side surface of the frustum-shaped conductor (105) is coated with an insulating material. The diameter length of the bottom end surface of the frustum-shaped conductor (105) is greater than the diameter length of the top end surface, and the diameter length of the bottom end surface of the frustum-shaped conductor (105) is less than the diameter length corresponding to the lower section body (102) at this moment when the frustum-shaped conductor (105) is completely in the extended state.

7. The electrolytic machining device according to claim 1, characterized in that: The inner cavity shape of the end of the lower section body (102) is in a horn shape, and the horn shape fits the side surface of the frustum-shaped conductor (105).

8. The electrolytic machining device according to claim 1, characterized in that: The bottom height of the conductive block (103) is lower than the height of the flexible expansion block (104).

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