Method and device for limiting meniscus air pressure of electrolyte

Abstract

The invention relates to an electrolyte meniscus air pressure limiting method and device. The device comprises a positive pressure device and a negative pressure device. The positive pressure device comprises a positive pressure system pressure switch, a positive pressure system two-position two-way pressure release valve, a positive pressure system two-position two-way pressure increasing valve, a positive pressure system throttling valve, a positive pressure system gas cylinder, a positive pressure system filter, a positive pressure system output pump and a positive pressure system relay; the negative pressure device comprises a negative pressure system pressure switch, a negative pressure system two-position two-way pressure release valve, a negative pressure system two-position two-way pressure increasing valve, a negative pressure system throttling valve, a negative pressure system gas cylinder, a negative pressure system filter, a negative pressure system output pump and a negative pressure system relay; and the two-position three-way electromagnetic valve is connected with an external nozzle through an air pipe. According to the invention, conversion of positive pressure and negative pressure can be completed in an extremely short time, and two opposite air pressure output modes required for blocking the nozzle by electrolyte or sweeps brought out by air bubble escape and air bubbles can be easily dealt with.

Description

Technical Field

[0001] The invention relates to the technical field of electrochemical machining, and in particular to a method and device for limiting the gas pressure of a curved liquid surface of an electrolyte. Background Art

[0002] The existing gas pressure output mode generally only supports a single positive or negative pressure output, and the lower limit of the gas pressure output is high, which basically cannot maintain the stability of the electrolyte curved liquid surface in the inter-electrode flow field. And tools such as injection pumps are not suitable for electrochemical additive and subtractive material manufacturing in the curved liquid surface mode because they cannot quickly respond to the changes in the inter-electrode flow field in the complex and chaotic inter-electrode processing area of ​​the electrochemical additive and subtractive material manufacturing process. For example, in electrochemical subtractive manufacturing, due to the accumulation of waste chips generated by the etching of the anode substrate and the disturbance of the flow field caused by the precipitation of cathode hydrogen bubbles, the inter-electrode in the processing process is a very chaotic area. The inter-electrode flow field in the processing process may often cause the electrolyte to escape with the escape of hydrogen bubbles, causing the electrolyte curved liquid surface to overflow and cause uncontrollable stray corrosion; it may also be caused by waste chips or hydrogen bubbles entering the nozzle, resulting in unsmooth liquid discharge and reaction interruption. For the chaotic inter-electrode flow field, a single gas pressure output mode cannot simultaneously cope with the frequent need for negative pressure suction and positive pressure blowing between the electrodes.

[0003] To this end, we propose a method and device for limiting the gas pressure of the electrolyte curved liquid surface. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a method and device for limiting the gas pressure of the curved liquid surface of the electrolyte, which can complete the conversion of positive and negative pressure in a very short time, and can easily deal with the two opposite gas pressure output modes required by the electrolyte brought out by bubble escape or the waste chips and bubble clogging the nozzle.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A device for limiting the pressure of an electrolyte meniscus, comprising:

[0007] Positive pressure device, including positive pressure system pressure switch, positive pressure system two-position two-way pressure relief valve, positive pressure system two-position two-way booster valve, positive pressure system throttle valve, positive pressure system gas cylinder, positive pressure system filter, positive pressure system output pump and positive pressure system relay;

[0008] The negative pressure device includes a negative pressure system pressure switch, a negative pressure system two-position two-way pressure relief valve, a negative pressure system two-position two-way booster valve, a negative pressure system throttle valve, a negative pressure system gas cylinder, a negative pressure system filter, a negative pressure system output pump and a negative pressure system relay;

[0009] The main circuit switch is connected to the positive pressure device and the negative pressure device to control the on and off of the circuit;

[0010] Two-position three-way solenoid valve, used for air pressure output, the two-position three-way solenoid valve is connected to the external nozzle through the air pipe;

[0011] Among them, the positive pressure system throttle valve is connected to the atmosphere, the positive pressure system throttle valve is also connected to the positive pressure system filter through the air pipe, the positive pressure system filter is connected to the positive pressure system two-position two-way pressure relief valve through the air pipe, the positive pressure system two-position two-way pressure relief valve is connected to the positive pressure system cylinder and the positive pressure system pressure switch through the air pipe, the positive pressure system cylinder is connected to the positive pressure system two-position two-way booster valve and the two-position three-way solenoid valve through the air pipe, the positive pressure system two-position two-way booster valve is connected to the positive pressure system output pump through the air pipe, and the positive pressure system output pump is connected to the positive pressure system relay through the air pipe; the negative pressure system throttle valve Connected to the atmosphere, the negative pressure system throttle valve is also connected to the negative pressure system filter through the air pipe, the negative pressure system filter is connected to the negative pressure system two-position two-way booster valve through the air pipe, the negative pressure system two-position two-way booster valve is connected to the negative pressure system gas cylinder and the negative pressure system pressure switch through the air pipe, the negative pressure system gas cylinder is connected to the negative pressure system two-position two-way pressure relief valve and the two-position three-way solenoid valve through the air pipe, the two-position three-way solenoid valve is connected to the external nozzle through the air pipe, the negative pressure system two-position two-way pressure relief valve is connected to the negative pressure system output pump through the air pipe, and the negative pressure system output pump is connected to the negative pressure system relay through the air pipe.

[0012] It is further characterized by:

[0013] The main opening of the line is externally connected to a 24V DC power supply, and the working voltage of the positive pressure system pressure switch and the negative pressure system pressure switch is 24V.

[0014] The positive pressure system throttle valve and the negative pressure system throttle valve are made of metal, the positive pressure system filter and the negative pressure system filter are made of metal, the positive pressure system gas cylinder and the negative pressure system gas cylinder are made of stainless steel, the positive pressure system pressure switch and the negative pressure system pressure switch are made of non-metallic material, the positive pressure system two-position two-way pressure relief valve, the positive pressure system two-position two-way booster valve, the negative pressure system two-position two-way pressure relief valve, and the negative pressure system two-position two-way booster valve are made of stainless steel, the two-position three-way solenoid valve is made of stainless steel, the positive pressure system relay and the negative pressure system relay are made of metal, and the positive pressure system output pump and the negative pressure system output pump are 3W ink pumps.

[0015] The air pipe is a No. 4 plastic hose.

[0016] The present invention also discloses a method for limiting the pressure of the electrolyte meniscus, comprising the following steps:

[0017] S1: Determine whether the air pressure device is in negative pressure output mode or positive pressure output mode according to the inner diameter d and length L of the external nozzle;

[0018] S2: Based on the capillary force σc, roughly estimate the air pressure range required to restrain the capillary force σc;

[0019] S3: using the electrolyte to be processed and its gravity G and the output pressure of the electrolyte meniscus gas pressure limiting device to overcome the capillary force σc to contact the substrate;

[0020] S4: The surface tension σ of the contact substrate combined with the electrolyte readjusts the output gas pressure so that the gas pressure is confined inside the outer diameter D of the external nozzle;

[0021] S5: Fine-tune the electrolyte meniscus gas pressure limiting device to form a suitable meniscus according to the flow field limitation requirements of electrochemical additive and subtractive manufacturing.

[0022] In steps S1-S5, the air pressure adjustment range is ±100Pa-±100kPa; the air pressure adjustment resolution is 100Pa.

[0023] In step S2, the capillary force σc is the resistance that the inner diameter d of the external nozzle used in the electrochemical additive and subtractive material manufacturing is subjected to under a certain processing fluid, which hinders the electrolyte from flowing out along the external nozzle; in step S3, the electrolyte deadweight G is the gravity of the electrolyte loaded into the syringe used in the electrochemical additive and subtractive material manufacturing; in step S4, the surface tension σ is the force that the electrolyte is subjected to after contacting the electrode substrate for the electrochemical additive and subtractive material manufacturing.

[0024] In step S4, the electrode substrate is a conductive substrate used for electrochemical additive and subtractive material processing.

[0025] In step S4, the outer diameter of the external nozzle is D, which is the outer diameter of the cylindrical electrode tool used for electrochemical additive manufacturing.

[0026] In step S5, the appropriate meniscus is a meniscus formed according to the characteristic size required by electrochemical machining and electrochemical deposition and the range of the liquid column that the meniscus can withstand.

[0027] The beneficial effects of the present invention are as follows:

[0028] The present invention has a compact and reasonable structure and is easy to operate. By optimizing the original gas pressure control design, complex problems that may exist between electrodes in the electrochemical additive and subtractive material manufacturing process can be quickly fed back in different gas pressure output modes under a small gas pressure output mode to ensure the stability of the electrolyte between electrodes in the electrochemical additive and subtractive material manufacturing process. In addition, the high gas pressure control accuracy can be fine-tuned to obtain a curved liquid surface liquid column according to the requirements of the electrochemical additive and subtractive material manufacturing for characteristic dimensions, thereby further improving the accuracy of the electrochemical additive and subtractive material manufacturing.

[0029] At the same time, the present invention also has the following advantages:

[0030] (1) The main circuit switch is connected to an external power supply for power supply. The power supply is a 24V DC power supply. The main circuit switch is connected to the positive pressure device, the negative pressure device and the two-position three-way solenoid valve. The main circuit switch controls the circuit on and off of the entire device.

[0031] (2) The positive pressure device is used to remove the violent bubbles generated in the electrochemical reaction, and the negative pressure device is used to control the stability of the inter-electrode liquid column. The switching between the positive pressure device and the negative pressure device can ensure the continuity of electrochemical additive and subtractive processing.

[0032] (3) The air pressure output of the present invention can further realize the interaction between the upper computer and the lower computer. Using software programming, it can realize instant positive and negative pressure switching to meet the processing requirements and ensure the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a system schematic diagram of the present invention.

[0034] Figure 2 Schematic diagram of the over-limited electrolyte meniscus of the present invention.

[0035] Figure 3 Schematic diagram of the perfect confining electrolyte meniscus of the present invention.

[0036] Figure 4 Schematic diagram of the electrolyte meniscus that is not completely restricted in the present invention.

[0037] Among them: 1. Positive pressure system throttle valve; 2. Positive pressure system filter; 3. Positive pressure system two-position two-way pressure relief valve; 4. Positive pressure system gas cylinder; 5. Positive pressure system two-position two-way booster valve; 6. Positive pressure system output pump; 7. Positive pressure system relay; 8. Positive pressure system pressure switch; 9. Two-position three-way solenoid valve; 10. Negative pressure system relay; 11. Negative pressure system output pump; 12. Negative pressure system two-position two-way pressure relief valve; 13. Negative pressure system gas cylinder; 14. Negative pressure system two-position two-way booster valve; 15. Negative pressure system filter; 16. Negative pressure system throttle valve; 17. Negative pressure system pressure switch; 18. External nozzle. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0039] like Figure 1As shown, a device for limiting the pressure of the electrolyte curved liquid surface includes a main circuit switch, a positive pressure device and a negative pressure device. The main circuit switch is externally connected to a power supply for power supply, and the power supply is a 24V DC power supply. The main circuit switch is connected to the positive pressure device, the negative pressure device and a two-position three-way solenoid valve 9. The circuit on and off of the entire device is controlled by the main circuit switch. The two-position three-way solenoid valve 9 serves as a pressure output port. The positive pressure device includes a positive pressure system pressure switch 8, a positive pressure system two-position two-way pressure relief valve 3, a positive pressure system two-position two-way booster valve 5, a positive pressure system throttle valve 1, a positive pressure system gas cylinder 4, a positive pressure system filter 2, a positive pressure system output pump 6 and a positive pressure system relay 7;

[0040] The negative pressure device includes a negative pressure system pressure switch 17, a negative pressure system two-position two-way pressure relief valve 12, a negative pressure system two-position two-way booster valve 14, a negative pressure system throttle valve 16, a negative pressure system gas cylinder 13, a negative pressure system filter 15, a negative pressure system output pump 11 and a negative pressure system relay 10.

[0041] The positive pressure system throttle valve 1 is connected to the atmosphere, and the positive pressure system throttle valve 1 is also connected to the positive pressure system filter 2 through an air pipe. The positive pressure system filter 2 is connected to the positive pressure system two-position two-way pressure relief valve 3 through an air pipe. The positive pressure system two-position two-way pressure relief valve 3 is connected to the positive pressure system gas cylinder 4 and the positive pressure system pressure switch 8 through an air pipe. The positive pressure system gas cylinder 4 is connected to the positive pressure system two-position two-way booster valve 5 and the two-position three-way solenoid valve 9 through an air pipe. The positive pressure system two-position two-way booster valve 5 is connected to the positive pressure system output pump 6 through an air pipe. The positive pressure system output pump 6 is connected to the positive pressure system relay 7 through an air pipe; the negative pressure system throttle valve 16 is connected to the atmosphere, and the negative pressure system The system throttle valve 16 is also connected to the negative pressure system filter 15 through the air pipe, the negative pressure system filter 15 is connected to the negative pressure system two-position two-way booster valve 14 through the air pipe, the negative pressure system two-position two-way booster valve 14 is connected to the negative pressure system gas cylinder 13 and the negative pressure system pressure switch 17 through the air pipe, the negative pressure system gas cylinder 13 is connected to the negative pressure system two-position two-way pressure relief valve 12 and the two-position three-way solenoid valve 9 through the air pipe, the two-position three-way solenoid valve 9 is connected to the external nozzle 18 through the air pipe, the negative pressure system two-position two-way pressure relief valve 12 is connected to the negative pressure system output pump 11 through the air pipe, and the negative pressure system output pump 11 is connected to the negative pressure system relay 10 through the air pipe.

[0042] The positive pressure system throttle valve 1 and the negative pressure system throttle valve 16 are made of metal, the positive pressure system filter 2 and the negative pressure system filter 15 are made of metal, the positive pressure system gas cylinder 4 and the negative pressure system gas cylinder 13 are made of stainless steel, the positive pressure system pressure switch 8 and the negative pressure system pressure switch 17 are made of non-metallic materials, the positive pressure system two-position two-way pressure relief valve 3, the positive pressure system two-position two-way booster valve 5, the negative pressure system two-position two-way pressure relief valve 12 and the negative pressure system two-position two-way booster valve 14 are made of stainless steel, the two-position three-way solenoid valve 9 is made of stainless steel, the positive pressure system relay 7 and the negative pressure system relay 10 are made of metal, the positive pressure system output pump 6 and the negative pressure system output pump 11 are 3W ink pumps, and the air pipes are both No. 4 plastic hoses.

[0043] The working voltage of the positive pressure system pressure switch 8 and the negative pressure system pressure switch 17 is 24 V. The positive pressure device and the negative pressure device for positive pressure output and negative pressure output have the same connection equipment and output mode, and the output conditions of the positive pressure device and the negative pressure device are different by adjusting the setting of the pressure switch.

[0044] like Figure 1-Figure 4 As shown, the present invention also discloses a method for limiting the pressure of the electrolyte meniscus, comprising the following steps:

[0045] S1: Determine whether the air pressure device is in negative pressure output mode or positive pressure output mode according to the inner diameter d and length L of the external nozzle 18;

[0046] S2: Based on the capillary force σc, roughly estimate the air pressure range required to restrain the capillary force σc;

[0047] S3: using the electrolyte to be processed and its gravity G and the output pressure of the electrolyte meniscus gas pressure limiting device to overcome the capillary force σc to contact the substrate;

[0048] S4: The surface tension σ of the contact substrate combined with the electrolyte is adjusted to adjust the output gas pressure so that the gas pressure is limited inside the outer diameter D of the external nozzle 18;

[0049] S5: Fine-tune the electrolyte meniscus gas pressure limiting device to form a suitable meniscus according to the flow field limitation requirements of electrochemical additive and subtractive manufacturing.

[0050] In step S2 , the capillary force σc is the resistance that the inner diameter d of the external nozzle 18 encounters in the electrochemical additive manufacturing process under a certain processing fluid, which prevents the electrolyte from flowing out along the external nozzle 18 .

[0051] In step S3, the electrolyte deadweight G is the weight of the electrolyte loaded into the syringe for electrochemical additive and subtractive material manufacturing.

[0052] In step S4, the surface tension σ is the force exerted on the electrolyte after it contacts the electrode substrate manufactured by electrochemical additive manufacturing.

[0053] In steps S1-S5, the air pressure adjustment range is ±100Pa-±100kPa; the air pressure adjustment resolution is 100Pa.

[0054] In step S4, the electrode substrate used for electrochemical additive and subtractive material manufacturing is a conductive substrate made of metal stainless steel or brass that can be used for electrochemical additive and subtractive material processing.

[0055] In step S4, the outer diameter D of the external nozzle 18 is the outer diameter of the cylindrical electrode tool used for electrochemical additive manufacturing.

[0056] In step S5 , the appropriate meniscus is a meniscus formed according to the feature size required by electrochemical machining or electrochemical deposition and the range of the liquid column that the meniscus can withstand.

[0057] The present invention optimizes the design of the original gas pressure control and provides rapid feedback on complex problems that may exist between electrodes during the electrochemical additive and subtractive material manufacturing process in different gas pressure output modes under a low gas pressure output mode to ensure the stability of the electrolyte between electrodes during the electrochemical additive and subtractive material manufacturing process. The high gas pressure control accuracy can be fine-tuned to obtain a curved liquid column according to the requirements of the electrochemical additive and subtractive material manufacturing for characteristic dimensions, thereby further improving the accuracy of the electrochemical additive and subtractive material manufacturing.

[0058] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A device for limiting the pressure of the electrolyte meniscus, characterized in that: include: A positive pressure device, comprising a positive pressure system pressure switch (8), a positive pressure system two-position two-way pressure relief valve (3), a positive pressure system two-position two-way pressure boosting valve (5), a positive pressure system throttle valve (1), a positive pressure system gas cylinder (4), a positive pressure system filter (2), a positive pressure system output pump (6) and a positive pressure system relay (7); A negative pressure device, comprising a negative pressure system pressure switch (17), a negative pressure system two-position two-way pressure relief valve (12), a negative pressure system two-position two-way pressure boosting valve (14), a negative pressure system throttle valve (16), a negative pressure system gas cylinder (13), a negative pressure system filter (15), a negative pressure system output pump (11) and a negative pressure system relay (10); The main circuit switch is connected to the positive pressure device and the negative pressure device to control the on and off of the circuit; A two-position three-way solenoid valve (9) is used for air pressure output, and the two-position three-way solenoid valve (9) is connected to an external nozzle (18) through an air pipe; The positive pressure system throttle valve (1) is connected to the atmosphere, and the positive pressure system throttle valve (1) is also connected to the positive pressure system filter (2) through an air pipe. The positive pressure system filter (2) is connected to the positive pressure system two-position two-way pressure relief valve (3) through an air pipe. The positive pressure system two-position two-way pressure relief valve (3) is respectively connected to the positive pressure system gas cylinder (4) and the positive pressure system pressure switch (8) through an air pipe. The positive pressure system gas cylinder (4) is respectively connected to the positive pressure system two-position two-way booster valve (5) and the two-position three-way solenoid valve (9) through an air pipe. The positive pressure system two-position two-way booster valve (5) is connected to the positive pressure system output pump (6) through an air pipe. The positive pressure system output pump (6) is connected to the positive pressure system relay (7) through an air pipe. The negative pressure system throttle valve (16) is connected to the atmosphere. The negative pressure system throttle valve (16) is also connected to the negative pressure system filter (15) through an air pipe, the negative pressure system filter (15) is connected to the negative pressure system two-position two-way booster valve (14) through an air pipe, the negative pressure system two-position two-way booster valve (14) is respectively connected to the negative pressure system gas cylinder (13) and the negative pressure system pressure switch (17) through an air pipe, the negative pressure system gas cylinder (13) is respectively connected to the negative pressure system two-position two-way pressure relief valve (12) and the two-position three-way solenoid valve (9) through an air pipe, the two-position three-way solenoid valve (9) is connected to the external nozzle (18) through an air pipe, the negative pressure system two-position two-way pressure relief valve (12) is connected to the negative pressure system output pump (11) through an air pipe, and the negative pressure system output pump (11) is connected to the negative pressure system relay (10) through an air pipe.

2. A device for limiting electrolyte meniscus pressure as claimed in claim 1, characterized in that: The main opening of the line is externally connected to a 24V DC power supply, and the working voltage of the positive pressure system pressure switch (8) and the negative pressure system pressure switch (17) is 24V.

3. The device for limiting the pressure of the electrolyte meniscus as claimed in claim 1, characterized in that: The positive pressure system throttle valve (1) and the negative pressure system throttle valve (16) are made of metal, the positive pressure system filter (2) and the negative pressure system filter (15) are made of metal, the positive pressure system gas cylinder (4) and the negative pressure system gas cylinder (13) are made of stainless steel, the positive pressure system pressure switch (8) and the negative pressure system pressure switch (17) are made of non-metallic materials, the positive pressure system two-position two-way pressure relief valve (3), the positive pressure system two-position two-way booster valve (5), the negative pressure system two-position two-way pressure relief valve (12) and the negative pressure system two-position two-way booster valve (14) are made of stainless steel, the two-position three-way solenoid valve (9) is made of stainless steel, the positive pressure system relay (7) and the negative pressure system relay (10) are made of metal, and the positive pressure system output pump (6) and the negative pressure system output pump (11) are 3W ink pumps.

4. The device for limiting the pressure of the electrolyte meniscus as claimed in claim 1, characterized in that: The air pipe is a No. 4 plastic hose.

5. A method for limiting the pressure of an electrolyte meniscus, using the device for limiting the pressure of an electrolyte meniscus according to claim 1, characterized in that: The steps include: S1: determining whether the air pressure device is in a negative pressure output mode or a positive pressure output mode according to the inner diameter d and the length L of the external nozzle (18); S2: Based on the capillary force σc, roughly estimate the air pressure range required to restrain the capillary force σc; S3: using the electrolyte to be processed and its gravity G and the output pressure of the electrolyte meniscus gas pressure limiting device to overcome the capillary force σc to contact the substrate; S4: the surface tension σ of the contact substrate combined with the electrolyte is adjusted to adjust the output gas pressure so that the gas pressure is limited to the inner portion of the outer diameter D of the external nozzle (18); S5: Fine-tune the electrolyte meniscus gas pressure limiting device to form a suitable meniscus according to the flow field limitation requirements of electrochemical additive and subtractive manufacturing.

6. A method for limiting the pressure of the electrolyte meniscus as claimed in claim 5, characterized in that: In steps S1-S5, the air pressure adjustment range is ±100Pa-±100kPa; the air pressure adjustment resolution is 100Pa.

7. A method for limiting the pressure of the electrolyte meniscus as claimed in claim 5, characterized in that: In step S2, the capillary force σc is the resistance of the inner diameter d of the external nozzle (18) used in the electrochemical additive and subtractive material manufacturing under a certain processing fluid to prevent the electrolyte from flowing out along the external nozzle (18); in step S3, the electrolyte deadweight G is the weight of the electrolyte loaded into the syringe used in the electrochemical additive and subtractive material manufacturing; In step S4, the surface tension σ is the force exerted on the electrolyte after it contacts the electrode substrate manufactured by electrochemical additive manufacturing.

8. A method for limiting the pressure of the electrolyte meniscus as claimed in claim 5, characterized in that: In step S4, the electrode substrate is a conductive substrate used for electrochemical additive and subtractive material processing.

9. A method for limiting the pressure of the electrolyte meniscus as claimed in claim 5, characterized in that: In step S4, the outer diameter D of the external nozzle (18) is the outer diameter of the cylindrical electrode tool used for electrochemical additive manufacturing.

10. A method for limiting the pressure of the electrolyte meniscus as claimed in claim 9, characterized in that: In step S5, the appropriate meniscus is a meniscus formed according to the characteristic size required by electrochemical machining and electrochemical deposition and the range of the liquid column that the meniscus can withstand.

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