Electrolytic machining system and method capable of avoiding nozzle droplet gathering and branch current

Abstract

According to the electrolytic machining system and method capable of avoiding nozzle droplet gathering and branch current, the water inlet end of the infusion pump is connected with the solution tank through the filter, the water outlet end of the infusion pump is connected with the jet flow spray head, and the multiple liquid suction needle heads are installed on the jet flow spray head in the circumferential direction of the nozzle of the jet flow spray head; each liquid suction needle is connected with the water inlet end of the multi-channel peristaltic pump, the water outlet end of the multi-channel peristaltic pump is connected with the dissolving tank, the electrolytic tank is arranged above the solution tank, the workbench is located below a nozzle of the jet flow sprayer and installed in the electrolytic tank, an electrolytic tank liquid outlet pipe is arranged at the bottom of the electrolytic tank, and the cutoff rotating tank is installed in the solution tank through a rotating shaft. The rotating shaft is positioned on the right side below the center of the electrolytic bath liquid outlet pipe; according to the invention, the solution gathered at the periphery of the nozzle in the machining process can be removed in time, so that the current is only transmitted in the jet flow, the machining quality and efficiency can be improved, and the energy loss is reduced.

Description

Technical Field

[0001] The invention belongs to the field of jet electrolytic precision machining, and in particular relates to an electrolytic machining system and method capable of avoiding nozzle droplet aggregation and branch current. Background Art

[0002] Jet electrochemical machining is an advanced machining technology that combines high-speed electrolyte jet and electrochemical corrosion principles. It is widely used in the manufacture of complex structures and high-precision parts. This technology sprays electrolyte onto the surface of the workpiece in the form of a high-speed jet. Under the synergistic effect of the electrolyte and the electric field, the material is efficiently removed through electrochemical reaction. Jet electrochemical machining has the characteristics of no mechanical force, no heat influence, and no burrs. It is particularly suitable for machining tiny holes, complex curved surfaces and special material parts that are difficult to achieve with traditional mechanical machining. Jet electrochemical machining uses high-speed jet electrolyte to form a fine jet. The cross-sectional area of ​​the jet is usually very small. The small cross-sectional area of ​​the jet and the long jet length significantly increase the circuit resistance. Therefore, ultra-high voltage is often required in jet electrochemical machining to generate high current density to achieve the maximum dissolution rate and ensure that the fast material is quickly removed. However, under the action of ultra-high electrostatic force, part of the solution will move to the periphery of the nozzle, gradually accumulate to form droplets, and splash will be generated when the jet is sprayed onto the surface of the workpiece. Splashing to the periphery of the nozzle will also form droplet aggregation. Droplets can easily short-circuit the circuit, causing cathode discharge at the nozzle, leading to nozzle wear and reducing the localization of anode workpiece dissolution. On the other hand, when power is applied to the cathode and anode, the current does not only pass through the jet, but also flows from the anode through the workbench, electrolytic cell, filter, liquid pump and pipeline into the cathode, thus forming a branch current, resulting in inaccurate measurement of processing data and power consumption. Summary of the invention

[0003] In response to the problems existing in the above-mentioned prior art, the present invention proposes an electrolytic machining system and method which can avoid nozzle droplet aggregation and branch current. The purpose is to promptly remove the solution accumulated at the periphery of the nozzle during the machining process so that the current is only transmitted in the jet, so as to solve the adverse cathode discharge and branch current problems in jet electrolytic machining, improve machining quality and efficiency, and reduce energy loss.

[0004] In order to achieve the above object, the specific scheme of the present invention is as follows:

[0005] The invention discloses an electrolytic machining system for avoiding nozzle droplet aggregation and branch current, comprising a filter, a multi-channel peristaltic pump, a liquid extraction pump, a liquid suction needle, a jet nozzle, an electrolytic cell, an electrolytic power supply, a flow-breaking rotating tank, a solution cell and a workbench for placing workpieces, wherein the water inlet of the liquid extraction pump is connected to the solution cell through the filter, the water outlet of the liquid extraction pump is connected to the jet nozzle, a plurality of liquid suction needles are respectively installed on the jet nozzle along the circumferential direction of the nozzle of the jet nozzle, each liquid suction needle is respectively connected to the water inlet of the multi-channel peristaltic pump, the water outlet of the multi-channel peristaltic pump is connected to the dissolution cell, an electrolytic cell is arranged above the solution cell, the workbench is located below the nozzle of the jet nozzle and is installed in the electrolytic cell, an electrolytic cell outlet pipe is arranged at the bottom of the electrolytic cell, the flow-breaking rotating tank is installed in the solution cell through a rotating shaft, and the rotating shaft is located on the right side below the center of the electrolytic cell outlet pipe, and the negative pole of the electrolytic power supply is connected to the jet nozzle.

[0006] Furthermore, a digital multimeter is included, wherein the positive electrode of the digital multimeter is connected to the positive electrode of the electrolytic power source, and the negative electrode is connected to the workpiece.

[0007] Furthermore, the liquid-absorbing needle is a tube with an opening at one end, and the open end of the liquid-absorbing needle is close to the nozzle of the jet nozzle, and a gap is provided between the open end of the liquid-absorbing needle and the nozzle of the jet nozzle.

[0008] Furthermore, the tube body is square or round, and the number of installed liquid-absorbing needles is set according to the size of the jet nozzle.

[0009] A flow-breaking rotating trough of the system, comprising a rotating shell, a partition, a side plate and a rotating shaft, wherein the rotating shell is a regular polygon, and partitions are respectively installed on the right side along each side of the rotating shell, and the two side plates are respectively installed on both sides of the rotating shell and each partition, so that the rotating shell, the two side plates and the plurality of partitions are arranged to form a plurality of liquid storage tanks, and the rotating shaft is passed through and connected to the middle of the rotating shell, and the rotating shaft is located 5 mm to the right below the center of the liquid outlet pipe of the electrolytic cell.

[0010] Furthermore, the length of the partition is greater than the length of each side of the rotating shell, and the number of the partitions and the liquid storage tanks is equal to the number of sides of the regular polygon, and the regular polygon is a regular hexagon, a regular heptagon, a regular octagon or a regular enneagon.

[0011] The processing method using the system comprises the following steps:

[0012] S1, install the workpiece on the workbench, adjust the height of the jet nozzle so that there is a gap between the nozzle of the jet nozzle and the surface of the workpiece, connect the positive electrode of the electrolytic power supply to the positive electrode of the digital multimeter, connect the negative electrode of the digital multimeter to the workpiece, and fill the solution tank with a neutral solution;

[0013] S2, respectively turn on the liquid extraction pump, the multi-channel peristaltic pump and the electrolytic power supply, the liquid extraction pump filters the solution in the solution tank and then draws it into the jet nozzle, and then ejects it from the nozzle to the workpiece in the form of a jet, the multi-channel peristaltic pump collects the accumulated droplets formed on the lower end surface of the jet nozzle at the opening of the liquid suction needle and draws them into the solution tank, the solution ejected onto the workpiece flows into the electrolytic tank through the workbench, and then flows from the liquid outlet pipe of the electrolytic tank to the liquid storage tank of the cut-off rotating tank to drive the cut-off rotating tank to rotate, the electrolytic power supply performs electrolytic processing on the workpiece, and after completing the processing of the required area of ​​the workpiece, turn off the power supply of the electrolytic power supply, the liquid extraction pump and the multi-channel peristaltic pump, unload the workpiece, and complete the processing.

[0014] Furthermore, in step 1, a distance of 10 mm is left between the nozzle and the workpiece surface, and the neutral solution is a NaCl solution and / or NaNO 3 Solution.

[0015] Advantages of the present invention

[0016] 1. The present invention provides an electrolytic machining system and method that can avoid nozzle droplet aggregation and branch current. A plurality of liquid suction needles are arranged in a circular array around the nozzle of the jet nozzle and connected to a multi-channel peristaltic pump, so that the multi-channel peristaltic pump can suck the aggregated droplets around the nozzle into the dissolution tank through the liquid suction needle. Since the solution gathered at the nozzle periphery during the machining process can be removed in time, adverse cathode discharge caused by aggregated droplets is avoided, thereby reducing nozzle loss.

[0017] 2. The invention can disconnect the current circuit formed by the workpiece, workbench, electrolytic cell, solution tank, filter, liquid pump and jet nozzle in sequence from the current-breaking rotating groove, so that the current is transmitted only in the jet, avoiding the formation of branch current, solving the problem of branch current in jet electrolytic machining, thereby improving the utilization rate of electric energy and improving machining accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the electrochemical machining system that can avoid nozzle droplet aggregation and branch current.

[0019] Figure 2 for Figure 1 Schematic diagram of the positional relationship between the interrupted flow rotating tank and the liquid outlet pipe of the electrolytic cell.

[0020] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure of the interrupted flow rotating tank.

[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the pipette needle.

[0022] Figure 5 for Figure 4 Schematic diagram of the installation of the aspiration needle, jet nozzle and multi-channel peristaltic pump.

[0023] In the figure:

[0024] 1. Filter; 2. Multi-channel peristaltic pump; 3. Suction pump; 4. Suction needle; 401. Tube body; 402. Opening; 5. Jet nozzle; 501. Nozzle; 6. Jet; 7. Workpiece; 8. Workbench; 9. Electrolytic cell; 901. Electrolytic cell outlet pipe; 10. Electrolytic power supply; 11. Digital multimeter; 12. Cut-off rotating tank; 121. Rotating shaft; 122. Liquid storage tank; 123. Partition; 124. Side plate; 125. Rotating shell; 13. Solution tank. DETAILED DESCRIPTION

[0025] The present invention is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be noted that this specific embodiment is not intended to limit the scope of rights of the present invention.

[0026] like Figures 1 to 5 As shown, the electrolytic machining system for avoiding nozzle droplet aggregation and branch current provided in this specific embodiment includes a filter 1, a multi-channel peristaltic pump 2, a suction pump 3, a liquid aspiration needle 4, a jet nozzle 5, an electrolytic cell 9, an electrolytic power supply 10, a flow-cutting rotating tank 12, a solution tank 13 and a workbench 8 for placing a workpiece 7.

[0027] Digital multimeter 11: Beijing Puyuan Jingdian Technology Co., Ltd., model: DM3058.

[0028] Electrolytic power supply 10: Hangzhou Pusyue Electronic Technology Co., Ltd., model: DCPS06.

[0029] Liquid pump 3: Kachuaner Fluid Technology (Shanghai) Co., Ltd., model: DIP1500.

[0030] Multi-channel peristaltic pump 2: Baoding Rongbai Constant Flow Pump Manufacturing Co., Ltd., model: BT100-2J.

[0031] The water inlet end of the liquid pump 3 is connected to the solution tank 13 through the filter 1, and the water outlet end of the liquid pump 3 is connected to the jet nozzle 5. The liquid suction needle 4 is a tube body 401 with an opening 402 at one end, and the tube body 401 is set to be square or round. The tube body 401 of this embodiment is square, and the size of its inner cavity cross-section is 1mm*1mm, and the length of the opening 402 is 3mm. Under this size, it is conducive to the aggregated droplets to flow through the opening 402 to the unopened end of the tube body 401 under the action of capillary force, and be sucked into the solution tank 13 through the multi-channel peristaltic pump 2, thereby avoiding the aggregation of droplets. NaCl solution and / or NaNO are respectively installed in the solution tank 13. 3Solution. The number of the liquid-absorbing needles 4 to be installed is set according to the size of the jet nozzle. In this embodiment, eight liquid-absorbing needles 4 are provided. The eight liquid-absorbing needles 4 are respectively installed on the jet nozzle 5 along the circumferential direction of the nozzle 501 of the jet nozzle 5, and one end of the opening 402 of the liquid-absorbing needle 4 is close to the nozzle 501 of the jet nozzle 5, and a gap of 1 mm is left between the nozzle 501 of the jet nozzle 5 to prevent one end of the opening 402 of the tube body 401 from touching the jet 6 and making the jet 6 unstable. The liquid-absorbing needle 4 is made of insulating material to avoid discharge at the liquid-absorbing needle 4.

[0032] Each pipetting needle 4 is respectively connected to the water inlet end of the multi-channel peristaltic pump 2, and the water outlet end of the multi-channel peristaltic pump 2 is connected to the dissolution tank 13. The purpose is to collect the aggregated droplets formed on the lower end surface of the jet nozzle 5 through the opening of the pipetting needle 4 and pump them into the solution tank 13 through the multi-channel peristaltic pump 2.

[0033] An electrolytic tank 9 is provided on the upper right side of the solution tank 13. A workbench 8 is located below the nozzle 501 of the jet nozzle 5 and is installed in the electrolytic tank 9. A workpiece 7 is installed on the workbench 8. The height of the jet nozzle 5 is adjusted to keep a distance of 10 mm between the nozzle 501 of the jet nozzle 5 and the workpiece 7.

[0034] An electrolytic cell outlet pipe 901 is provided at the bottom of the electrolytic cell 9, and the flow-breaking rotating tank 12 is made of insulating material to prevent it from producing a conductive effect on the solution. The flow-breaking rotating tank 12 is installed in the solution tank 13 through a rotating shaft 121, and the rotating shaft 121 is located on the right side below the center of the electrolytic cell outlet pipe 901. Specifically, the flow-breaking rotating tank 12 includes a rotating shell 125, a partition 123, a side plate 124 and a rotating shaft 121. The rotating shell is a regular polygon, and the regular polygon is a regular hexagon, a regular heptagon, a regular octagon or a regular enneagon. The number of the partitions 123 and the liquid storage tanks 122 is equal to the number of sides of the regular polygon. The rotating shell 125 of this embodiment is set to be hexagonal, the length of the partition 123 is greater than the length of each side of the rotating shell 125, and the partitions 123 are respectively installed on the right side of each side of the rotating shell 125. The two side plates 124 are respectively installed on both sides of the rotating shell 125 and each partition 123, so that the rotating shell 125, the two side plates 124 and the multiple partitions 123 are surrounded by six liquid storage tanks 122, the purpose of which is to isolate the solutions in each liquid storage tank 122 from each other. The rotating shaft 121 is connected to the middle of the rotating shell 125 through a bearing, and the rotating shaft 121 is located 5mm to the right below the center of the electrolytic cell liquid outlet pipe 901, in order to prevent the solution of the electrolytic cell 9 from generating a clockwise torque on the flow-breaking rotating tank 12, which will hinder the flow-breaking rotating tank 12 from rotating counterclockwise.

[0035] The positive electrode of the electrolytic power source 10 is directly connected to the workpiece 7 through a wire, or the positive electrode of the electrolytic power source 10 is connected to the positive electrode of the digital multimeter 11, and then the negative electrode of the digital multimeter 11 is connected to the workpiece 7. The purpose of connecting the digital multimeter 11 is to use the digital multimeter 11 to read the current in the processing circuit, and then manually input the computer control system for data processing to determine the processing status. The negative electrode of the electrolytic power source 10 is connected to the jet nozzle 5.

[0036] Working principle:

[0037] Before use, the workpiece 7 is mounted on the workbench 8, the height of the jet nozzle 5 is adjusted to leave a 10 mm gap between the nozzle 501 and the surface of the workpiece 7, the positive electrode of the electrolytic power source 10 is connected to the positive electrode of the digital multimeter 11, the negative electrode of the digital multimeter 11 is connected to the workpiece 7, and after the neutral solution is filled into the solution tank 13, the liquid pump 3, the multi-channel peristaltic pump 2 and the electrolytic power source 10 are turned on respectively, the liquid pump 3 filters the solution in the solution tank 13 through the filter 1 and then pumps it into the jet nozzle 5, and the solution then flows out from the nozzle 501 of the jet nozzle 5 in the form of a jet. The liquid is sprayed onto the workpiece 7, and the multi-channel peristaltic pump 2 collects the accumulated droplets formed on the lower end surface of the jet nozzle 5 at the opening 402 of the liquid suction needle 4 and pumps them into the solution tank 13. The solution sprayed onto the workpiece 7 flows into the electrolytic tank 9 through the workbench 8, and then flows from the electrolytic tank outlet pipe 901 to the liquid storage tank 122 of the flow-breaking rotating tank 12 to promote the rotation of the flow-breaking rotating tank 12. The electrolytic power supply 10 performs electrolytic processing on the workpiece 7. After completing the processing of the required area of ​​the workpiece 7, the power supplies of the electrolytic power supply 10, the liquid suction pump 3 and the multi-channel peristaltic pump 2 are turned off, the workpiece 7 is unloaded, and the processing is completed.

[0038] The processing method using the system comprises the following steps:

[0039] S1, install the workpiece 7 on the workbench 8, adjust the height of the jet nozzle 5, leave a distance of 10 mm between the nozzle 501 of the jet nozzle 5 and the surface of the workpiece, connect the positive electrode of the electrolytic power supply 10 to the positive electrode of the digital multimeter 11, connect the negative electrode of the digital multimeter 11 to the workpiece, and fill the solution tank 13 with a neutral solution; the neutral solution is a NaCl solution and / or NaNO 3 Solution.

[0040] S2, turn on the liquid pump 3, the multi-channel peristaltic pump 2 and the electrolytic power supply 10 respectively, the liquid pump 3 filters the solution in the solution tank 13 through the filter 1 and then pumps it into the jet nozzle 5, and the solution is then ejected from the nozzle 501 onto the workpiece 7 in the form of a jet with a flow rate of 0.5L / min, the multi-channel peristaltic pump 2 collects the accumulated droplets formed on the lower end surface of the jet nozzle 5 at the opening 402 of the liquid suction needle 4 and pumps them into the solution tank 13, the solution ejected onto the workpiece 7 flows into the electrolytic tank 9 through the workbench 8, and then The liquid flows from the liquid outlet pipe 901 of the electrolytic cell into the liquid storage tank 122 of the flow-off rotating tank 12, and the solution is driven by gravity to rotate the flow-off rotating tank 12. Since the solutions in each liquid storage tank 122 are isolated from each other, it can be ensured that the current will not pass through the flow-off rotating tank 12, thereby avoiding the generation of branch current. The electrolytic power supply 10 performs electrolytic processing on the workpiece 7. After completing the processing of the required area of ​​the workpiece 7, the power supplies of the electrolytic power supply 10, the liquid suction pump 3 and the multi-channel peristaltic pump 2 are turned off, the workpiece 7 is unloaded, and the processing is completed.

Claims

1. An electrochemical machining system that avoids nozzle droplet aggregation and branch current, characterized in that: It includes a filter, a multi-channel peristaltic pump, a liquid suction pump, a liquid suction needle, a jet nozzle, an electrolytic cell, an electrolytic power supply, a flow-breaking rotating tank, a solution tank and a workbench for placing workpieces. The water inlet end of the liquid suction pump is connected to the solution tank through the filter, and the water outlet end of the liquid suction pump is connected to the jet nozzle. A plurality of liquid suction needles are respectively installed on the jet nozzle along the circumferential direction of the nozzle of the jet nozzle. Each liquid suction needle is respectively connected to the water inlet end of the multi-channel peristaltic pump, and the water outlet end of the multi-channel peristaltic pump is connected to the dissolution tank. An electrolytic cell is arranged above the solution tank. The workbench is located below the nozzle of the jet nozzle and is installed in the electrolytic cell. An electrolytic cell outlet pipe is arranged at the bottom of the electrolytic cell. The flow-breaking rotating tank is installed in the solution tank through a rotating shaft, and the rotating shaft is located on the right side below the center of the electrolytic cell outlet pipe. The negative pole of the electrolytic power supply is connected to the jet nozzle.

2. The system according to claim 1, characterized in that: The invention comprises a digital multimeter, wherein the positive pole of the digital multimeter is connected to the positive pole of the electrolytic power source, and the negative pole is connected to the workpiece.

3. The system according to claim 1, characterized in that: The liquid-absorbing needle is a tube with an opening at one end. The open end of the liquid-absorbing needle is close to the nozzle of the jet nozzle, and a gap is provided between the open end of the liquid-absorbing needle and the nozzle of the jet nozzle.

4. The system according to claim 3, characterized in that: The tube body is square or round, and the number of installed liquid-absorbing needles is set according to the size of the jet nozzle.

5. A flow-breaking rotating tank of the system according to claim 1, characterized in that: The flow-breaking rotating trough includes a rotating shell, a partition, a side plate and a rotating shaft. The rotating shell is a regular polygon. The partitions are respectively installed on the right side along each side of the rotating shell. The two side plates are respectively installed on both sides of the rotating shell and each partition, so that the rotating shell, the two side plates and multiple partitions are surrounded by multiple liquid storage tanks. The rotating shaft is connected to the middle of the rotating shell, and the rotating shaft is located 5 mm to the right below the center of the liquid outlet pipe of the electrolytic cell.

6. The flow-breaking rotary trough according to claim 5, characterized in that: The length of the partition is greater than the length of each side of the rotating shell, and the number of the partitions and the liquid storage tanks is equal to the number of sides of the regular polygon, which is a regular hexagon, a regular heptagon, a regular octagon or a regular enneagon.

7. A processing method using the system according to any one of claims 1 to 6, characterized in that: The steps include: S1, install the workpiece on the workbench, adjust the height of the jet nozzle so that there is a gap between the nozzle of the jet nozzle and the surface of the workpiece, connect the positive electrode of the electrolytic power supply to the positive electrode of the digital multimeter, connect the negative electrode of the digital multimeter to the workpiece, and fill the solution tank with a neutral solution; S2, respectively turn on the liquid extraction pump, the multi-channel peristaltic pump and the electrolytic power supply, the liquid extraction pump filters the solution in the solution tank and then draws it into the jet nozzle, and then ejects it from the nozzle to the workpiece in the form of a jet, the multi-channel peristaltic pump collects the accumulated droplets formed on the lower end surface of the jet nozzle at the opening of the liquid suction needle and draws them into the solution tank, the solution ejected onto the workpiece flows into the electrolytic tank through the workbench, and then flows from the liquid outlet pipe of the electrolytic tank to the liquid storage tank of the cut-off rotating tank to drive the cut-off rotating tank to rotate, the electrolytic power supply performs electrolytic processing on the workpiece, and after completing the processing of the required area of ​​the workpiece, turn off the power supply of the electrolytic power supply, the liquid extraction pump and the multi-channel peristaltic pump, unload the workpiece, and complete the processing.

8. The method according to claim 7, characterized in that: In step 1, a distance of 10 mm is left between the nozzle and the workpiece surface, and the neutral solution is a NaCl solution and / or a NaNO3 solution.

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