Overflow recess for assisting in manufacturing wick and wick manufacturing method

Abstract

An overflow recess for assisting in manufacturing a wick and a wick manufacturing method, relating to the technical field of wick manufacturing. The overflow recess comprises a second recess body, a liquid inlet pipe (2-2) and a frame body (1); the liquid inlet pipe (2-2) communicates the outside of the second recess body with the overflow recess; two surfaces of the frame body (1) that are not adjacent to each other are hermetically connected to two surfaces of the second recess body that are not adjacent to each other; gaps are provided between the other two surfaces of the frame body (1) and the other two surfaces of the second recess body; the gaps are used for accommodating a workpiece (2) to be processed when the manufacturing of a wick is assisted; an overflow port is provided on the frame body (1); during manufacturing, by means of coupling between the high-speed movement of a laser galvanometer and the movement of the workpiece (2) and coupling between continuous liquid and air processing, a large-format recess structure can be manufactured, and the recess size is easy to adjust. The design of the overflow recess allows for an one-step wick manufacturing process, and achieves high-surface-quality, highly flexible and efficient processing of a large-aspect-ratio primary recess structure on an ultra-thin metal surface, thereby improving the processing efficiency of multi-stage recess structures.

Description

An overflow groove for assisting in the preparation of a suction core and a method for preparing the suction core. Technical Field

[0001] This invention relates to an overflow groove for assisting in the preparation of a suction core and a method for preparing a suction core, belonging to the field of suction core preparation technology. Background Technology

[0002] Ultrathin heat pipes, as highly efficient passive heat transfer elements, rely on the phase change of the internal working medium liquid to rapidly transfer heat from the heat source to the heat sink or external environment along the axial direction with a small temperature difference, thereby quickly reducing the heat accumulated on the heat source and lowering its temperature. Their thickness is typically less than 2 mm. The wick is a key component affecting the heat transfer capacity of the heat pipe. During operation, the wick needs to transport the working fluid from the condensation section to the evaporation section, keeping the wick channel and evaporation section moist and preventing damage to the heat pipe's interior due to dryness. Currently, commonly used wicks include sintered wicks, grooved wicks, and composite wicks. Sintered wicks are mostly porous with small pores and high capillary force, but low permeability and high thermal resistance between the wick and the wall. Grooved wicks exhibit the opposite characteristics, possessing high permeability but lower capillary force. Composite wicks can achieve both high capillary force and high permeability, but their preparation process is cumbersome, time-consuming, and costly.

[0003] Currently, researchers primarily address the capillary performance issues of wicking cores by controlling the surface properties of the wicking core materials through surface modification techniques, thereby improving their capillary force and surface wettability. Among these, microstructure modification, chemical etching, and laser processing are the most common techniques. However, because the capillary performance of wicking cores is complexly influenced by their surface geometry and surface chemistry, these methods, while improving capillary performance to some extent, all have certain limitations. Laser processing for microstructure modification makes the fabrication of high-performance wicking cores simple, rapid, economical, and environmentally friendly. Existing technologies mainly suffer from the following drawbacks:

[0004] It is difficult to achieve high surface quality, high flexibility and high efficiency in the primary groove structure with large aspect ratio on ultra-thin metal surfaces. The processing steps of multi-level groove structure are complicated and inefficient. Summary of the Invention

[0005] The purpose of this invention is to provide an overflow groove for assisting in the preparation of a liquid-absorbing core and a method for preparing the liquid-absorbing core, so as to achieve high surface quality, high flexibility and high efficiency in the processing of primary groove structures with large aspect ratio on ultrathin metal surfaces, and to improve the processing efficiency of multi-level groove structures.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] In a first aspect, the present invention provides an overflow channel for assisting in the preparation of a liquid-absorbing core, comprising a second channel body, an inlet pipe, and a frame body; the inlet pipe connects the second channel body and the outside of the overflow channel; the frame body and the second channel body are quadrilaterals of the same shape in plan view; two non-adjacent sides of the frame body and two non-adjacent sides of the second channel body are sealed together; gaps are left between the other two sides of the frame body and the other two sides of the second channel body; the gaps are used to accommodate the workpiece to be processed during the auxiliary preparation of the liquid-absorbing core; the height of the gaps is greater than the thickness of the workpiece; the height of the gaps is also less than the maximum height required to prevent liquid from flowing out of the gaps while accommodating the workpiece; an overflow port is provided on the frame body; when the workpiece is accommodated in the gaps and liquid flows into the inlet pipe, the upper surface of the workpiece is covered with a liquid film.

[0008] Furthermore, it also includes a first connecting part and a second connecting part;

[0009] In the auxiliary preparation of the liquid absorption core, the movement direction of the workpiece to be processed is the X direction, and the direction perpendicular to the movement direction on the plane of the workpiece is the Y direction. The frame and the second tank are both rectangular. There are two second connecting parts, which are respectively located at the top of the two sides of the second tank in the Y direction. There are two first connecting parts, which are respectively located at the bottom of the two sides of the frame in the Y direction. The first connecting parts and the corresponding second connecting parts are sealed together. The gap is located between the two sides of the frame in the X direction and the two sides of the corresponding second tank in the X direction. There are two gaps in total.

[0010] The first connecting part is a protruding part, and the second connecting part is a recessed part, with the protruding structure in the protruding part and the recessed structure in the recessed part cooperating.

[0011] Furthermore, it also includes the first tank and the outlet pipe;

[0012] The second tank is located inside and above the first tank, and the liquid outlet pipe connects the first tank and the outside of the overflow tank.

[0013] Furthermore, the overflow port is located on the surface of the frame where the next gap is located in the X direction.

[0014] Furthermore, the width of the overflow port is the distance between the two inner walls of the frame in the Y direction.

[0015] Furthermore, the inlet pipe also passes through the wall of the first tank.

[0016] Furthermore, the maximum height at which liquid will not flow out of the gap while accommodating the workpiece is 0.5 mm.

[0017] In a second aspect, the present invention provides a method for preparing a liquid-absorbing core based on an overflow groove according to any one of the first aspects, comprising:

[0018] Pull the workpiece out from the winding mechanism, then pass the workpiece through the two gaps in the X direction, and then fix one end of the workpiece to the winding mechanism.

[0019] Connect the inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece;

[0020] The winding mechanism is opened, which drives the workpiece to move along the X direction. At the same time, the laser is turned on, and the primary groove structure is processed on the workpiece under the liquid film by the laser. The secondary groove structure is also processed on the workpiece under the liquid film by the laser.

[0021] After the part of the workpiece to be processed comes out of the liquid film, a secondary microgroove structure is processed in the air by laser to obtain a liquid-absorbing core with a multi-level groove structure.

[0022] Furthermore, before opening the winding mechanism and the laser, a cathode is set at the edge of the preset laser beam motion trajectory, the workpiece is used as the anode, the anode is connected to the negative terminal of the pulse power supply, and the cathode is connected to the positive terminal of the pulse power supply.

[0023] The liquid in question is a neutral electrolyte.

[0024] Furthermore, the neutral electrolyte includes a sodium nitrate solution.

[0025] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0026] This invention provides an overflow groove and a method for preparing a liquid-absorbing core. Through the structural design of the overflow groove, a liquid film covers the upper surface of the workpiece as it passes through the gap. With the assistance of the overflow groove, liquid-assisted preparation of the liquid-absorbing core can be achieved. Liquid-assisted laser-prepared liquid-absorbing cores exhibit higher capillary force, pattern resolution, and surface smoothness compared to samples prepared by laser modification in air. This is because during laser processing in air, the molten metal generated is difficult to remove in time, often forming a large amount of recast layer. Furthermore, due to plasma generation, laser energy is partially absorbed and shielded, resulting in low energy transfer efficiency, poor surface treatment, and often uneven grooves. Edges and irregular surface morphology are common problems in liquid-assisted laser processing. Liquid film significantly improves these shortcomings through its effect on the surface. The liquid film effectively suppresses plasma formation, reducing its shielding effect on laser energy, allowing more laser energy to be efficiently transferred to the metal surface, thus improving processing accuracy. Furthermore, the evaporation and shock wave effects of the liquid promote the rapid removal of molten metal, preventing the formation of a recast layer and improving surface smoothness. The liquid also acts as a coolant, effectively controlling local temperature and preventing overheating and diffusion, further avoiding thermal deformation and surface unevenness. Additionally, the liquid can remove waste material during processing, reducing metal splashing and making grooves and patterns more regular and smooth.

[0027] By utilizing the overflow channel structure design, liquid-assisted laser processing is achieved. Combined with laser processing in air, a one-step liquid-air composite laser processing method is realized to prepare wicks without secondary processing, greatly improving processing efficiency. Moreover, it is very flexible compared to other technologies when processing microgroove structures with different aspect ratios or patterns, requiring only changes in laser processing parameters. For example, it does not require the fabrication of additional masks as in photolithography. The ultra-high scanning speed of the laser galvanometer, combined with multi-channel laser scanning patterns, enables the simultaneous fabrication of multiple wicks, greatly improving the fabrication efficiency of wicks. Attached Figure Description

[0028] Figure 1 is a cross-sectional schematic diagram of the first tank provided in an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the frame provided in an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the overflow groove provided in an embodiment of the present invention when accommodating a workpiece;

[0031] Figure 4 is a schematic diagram of the overflow channel without a frame provided in an embodiment of the present invention;

[0032] Figure 5 is a flowchart of the liquid absorption core preparation method provided in the embodiment of the present invention;

[0033] Figure 6 is an overall schematic diagram of the liquid-absorbing core preparation process provided in the embodiment of the present invention;

[0034] Figure 7 is a flowchart of the liquid-absorbing core with a multi-level groove structure prepared by a metal sheet according to an embodiment of the present invention;

[0035] Figure 8 is a schematic diagram of the multi-level trench structure prepared by the method shown in Figure 7 according to an embodiment of the present invention;

[0036] Figure 9 is a schematic diagram of laser parameter design when performing the method shown in Figure 7 according to an embodiment of the present invention;

[0037] Figure 10 is a detailed schematic diagram of laser processing of workpieces with liquid assistance according to an embodiment of the present invention;

[0038] Figure 11 is a schematic diagram of the principle of multi-laser spot overlap in one-step processing of multi-level trench structures provided in an embodiment of the present invention;

[0039] Figure 12 is a schematic diagram of the overflow groove during electrolyte-assisted preparation of the wicking core according to an embodiment of the present invention;

[0040] Figure 13 is a cross-sectional schematic diagram of the overflow groove during electrolyte-assisted preparation of the wicking core according to an embodiment of the present invention.

[0041] In the figure: 1. Frame; 1-1. First connecting part; 1-2. Overflow surface; 1-3. Non-overflow surface; 1-4. Liquid flow direction; 2. Workpiece; 2-1. Second connecting part; 2-2. Liquid inlet pipe; 2-3. Overflow chamber; 2-4. Return chamber; 2-5. Liquid outlet pipe; 3. First tank; 6. Liquid; 7. Gap; 8. Liquid film thickness; 9. Wire electrode; 10. Pulse power supply. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0043] Example 1.

[0044] This invention provides an overflow channel for assisting in the preparation of a liquid-absorbing core, comprising a first channel body, a second channel body, an inlet pipe, an outlet pipe, and a frame body;

[0045] The second tank is located inside the first tank and is higher than the first tank. The inlet pipe connects the second tank to the outside of the overflow tank, and the outlet pipe connects the first tank to the outside of the overflow tank.

[0046] The frame and the second tank are quadrilaterals of the same shape when viewed from above. The two non-adjacent sides of the frame and the two non-adjacent sides of the second tank are sealed together. There are gaps between the other two sides of the frame and the other two sides of the second tank. The gaps are used to accommodate the workpiece to be processed when preparing the liquid suction core. The height of the gap is greater than the thickness of the workpiece. The height of the gap is also less than the maximum height that the liquid will not flow out of the gap while accommodating the workpiece. An overflow port is provided on the frame. When the workpiece is accommodated in the gap and liquid is introduced into the liquid inlet pipe, the upper surface of the workpiece is covered with a liquid film.

[0047] This invention, through the structural design of the overflow channel, ensures that the upper surface of the workpiece is covered with a liquid film when passing through the gap. With the assistance of the overflow channel, liquid-assisted preparation of the wicking core can be achieved. The wicking core prepared by liquid-assisted laser processing exhibits higher capillary force, pattern resolution, and surface smoothness compared to samples prepared by laser modification in air. This is because during laser processing in air, the molten metal generated is difficult to remove in time, often forming a large amount of recast layer. Furthermore, due to the generation of plasma, laser energy is partially absorbed and shielded, resulting in low energy transfer efficiency, poor surface treatment, and often uneven groove edges and irregular surface morphology. Volume-assisted laser processing significantly improves these shortcomings through the action of a liquid film. The liquid film can effectively suppress the formation of plasma and reduce its shielding effect on laser energy, allowing more laser energy to be efficiently transferred to the metal surface, thus improving processing accuracy. In addition, the evaporation and shock wave effect of the liquid promotes the rapid removal of molten metal, avoids the formation of a recast layer, and improves surface smoothness. The liquid also plays a cooling role, effectively controlling local temperature and preventing overheating diffusion, further avoiding thermal deformation and surface unevenness. The liquid can also carry away waste materials during processing, reducing metal splashing and making grooves and patterns more regular and smooth.

[0048] Example 2.

[0049] As shown in Figures 1 to 4, the present invention provides an overflow tank for assisting in the preparation of a liquid-absorbing core, comprising a first tank body 3, a second tank body, an inlet pipe 2-2, an outlet pipe 2-5, a frame body 1, a first connecting part 1-1, and a second connecting part 2-1.

[0050] As shown in Figures 1 and 3, the second groove is located in the first groove 3, and the height of the second groove is higher than the height of the first groove 3, so that the workpiece 2 can pass through the gap 7 without bending. The movement direction of the workpiece 2 is the X direction, and the Y direction is located on the plane where the workpiece 2 is located. The Y direction is perpendicular to the X direction. In this embodiment, the Y direction is as shown in Figure 3.

[0051] As shown in Figures 1 and 3, two non-adjacent surfaces of the frame 1 (two non-overflow surfaces 1-3 in the Y direction in this embodiment) are sealed together with two non-adjacent surfaces of the second tank. A gap 7 is left between the other two surfaces of the frame 1 and the other two surfaces of the second tank. The gap 7 is used to accommodate the workpiece 2 to be processed when assisting in the preparation of the liquid suction core. The height of the gap 7 is greater than the thickness of the workpiece 2. The height of the gap 7 is also less than the maximum height that ensures the liquid will not flow out of the gap 7 while accommodating the workpiece. In this embodiment, the maximum height is 0.5 mm.

[0052] As shown in Figure 2, the frame 1 has four surfaces, one of which is lower than the other three. The lower surface is the overflow surface 1-2, and the other three surfaces are non-overflow surfaces 1-3. In this embodiment, as shown in Figure 1, liquid 6 flows out from the overflow surface 1-2, and the direction of liquid flow is as shown by the arrow in Figure 2 (1-4). At the bottom of the two overflow surfaces 1-3 in the Y direction, there are two first connecting parts 1-1, which are protrusions.

[0053] As shown in Figure 4, the second tank has two second connecting parts 2-1 on the top of the two sides in the Y direction. The second connecting parts 2-1 are recessed parts. The protruding structure in the protruding part and the recessed structure in the recessed part cooperate to achieve a sealed connection. The interior of the second tank is an overflow chamber 2-3. The part between the second tank and the first tank is a return chamber 2-4. The liquid inlet pipe 2-2 connects the liquid storage tank and the second tank. The liquid outlet pipe 2-5 connects the first tank 3 and the liquid storage tank. The submersible pump is connected to the liquid storage tank and the liquid inlet pipe 2-2. When liquid 6 needs to be supplied, the submersible pump draws water from the liquid storage tank and injects it into the overflow chamber 2-3. As the amount of liquid 6 flowing in increases, due to the very small height of the gap 7, it eventually overflows from the top and submerges the workpiece 2 (the part of the workpiece 2 located in the overflow chamber 2-3 area), forming a liquid film. The thickness of the liquid film 8 is shown in Figure 1. The thickness of the liquid film 8 can be controlled by adjusting the height of the overflow surface 1-2. In this embodiment, the position above the overflow surface 1-2 is the overflow port. However, this patent is not limited to the overflow design shown in Figure 2. The overflow port can also be designed in the overflow surface 1-2, that is, an overflow port can be dug out at the overflow surface 1-2, which can also achieve overflow and limit the overflow direction.

[0054] If the purpose is only to achieve the goal of covering the upper surface of the workpiece 2 with a liquid film when the workpiece 2 is contained in the gap 7 and liquid 6 is introduced into the inlet pipe 2-2, this patent can remove the first tank 3 and the outlet pipe 2-5, and the overflow and liquid film coverage can be achieved in the same way. In this embodiment, the first tank 3 and the outlet pipe 2-5 are set in order to achieve the recycling of liquid.

[0055] When laser processing is performed in air, the molten metal is difficult to remove and the plasma shielding the laser during the processing leads to the formation of a recast layer on the surface, resulting in poor processing accuracy and an uneven surface. This invention achieves liquid-assisted preparation of the wick through the structural design of the overflow groove. Liquid-assisted laser processing suppresses plasma generation through the liquid film, improves laser energy transfer efficiency, promotes the removal of molten metal, avoids the recast layer, significantly improves surface smoothness and pattern resolution, and enhances processing effect and efficiency.

[0056] Example 3.

[0057] As shown in Figure 5, the present invention provides a method for preparing a liquid suction core based on the overflow groove provided in Example 1, comprising:

[0058] Pull the workpiece out from the winding mechanism, then pass the workpiece through the two gaps in the X direction, and then fix one end of the workpiece to the winding mechanism.

[0059] Connect the inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece;

[0060] The winding mechanism is opened, which drives the workpiece to move along the X direction. At the same time, the laser is turned on, and the primary groove structure is processed on the workpiece under the liquid film by the laser. The secondary groove structure is also processed on the workpiece under the liquid film by the laser.

[0061] After the part of the workpiece to be processed comes out of the liquid film, a secondary microgroove structure is processed in the air by laser to obtain a liquid-absorbing core with a multi-level groove structure.

[0062] As shown in Figure 3, the direction of motion of workpiece 2 is the X direction.

[0063] Example 4.

[0064] As shown in Figures 6 and 7, the present invention provides a method for preparing a liquid-absorbing core based on the overflow groove provided in Example 2, comprising:

[0065] Step 1: Before the experiment, the aluminum-based sheet roll material to be processed (i.e., the metal sheet shown in Figure 7) was soaked in acetone, anhydrous ethanol and deionized water, ultrasonically cleaned and dried.

[0066] Step 2: Load the aluminum-based sheet roll material to be processed onto the roll-out rotary motor (i.e., the roll-out mechanism), then lead it out through the slit 7 shown in Figure 1, load one end through the slit 7 onto the roll-in rotary motor (i.e., the roll-in mechanism), and ensure that the workpiece is within the appropriate laser processing area.

[0067] Step 3: In the MarkingMate software, set up multiple scan lines and set it to repeat automatic engraving.

[0068] Step 4: Turn on the submersible pump and inject deionized water into the second tank, keeping the water flowing in a continuous cycle until the liquid film covers the upper surface of the aluminum-based sheet.

[0069] Step 5: Turn on the rotary motor and allow it to rotate at the set speed, causing the aluminum-based sheet roll to be rolled out from the rotating shaft of the rotary motor, pass through gap 7, and be wound onto the rotating shaft of the winding motor; at the same time, turn on the laser and allow it to begin processing according to the scanning line segment set in the MarkingMate software. This achieves liquid-gas recombination and multi-stage preparation of the liquid-absorbing core.

[0070] Step 6: After processing, turn off the laser, wind in the rotary motor, wind out the rotary motor, and submersible pump in sequence. Remove the liquid-absorbing core product prepared on the rotating shaft of the wound rotary motor and place it in a vacuum drying oven to dry, thus completing the entire preparation process.

[0071] As shown in Figure 7, step 5 mainly includes two parts. The first part is to perform laser processing in deionized water to form a primary trench structure and a secondary trench structure. The trench depth of the primary trench structure is 50-500 μm. Compared with processing in air, this method can easily achieve high-precision processing of trench structures with a large aspect ratio and has higher surface quality. For a detailed analysis of the principle, please refer to Example 1. The second part is to use the molten material generated by the strong ablation effect of laser in air, and change the aggregation morphology of the molten material by controlling the laser scanning path, thereby preparing a secondary micro-groove structure with a nanoscale structure on the surface of the primary trench structure.

[0072] The fabricated multi-level trench structure is shown in Figure 8.

[0073] In the above method, the grooves are formed by the superposition of laser spots in the X and Y directions. As shown in Figure 6, during the processing, the laser beam driven by the galvanometer moves rapidly along the X direction, and different numbers, widths, and distribution periods of groove structures can be processed simply by setting different motion trajectories.

[0074] The workpiece is driven by a linear motion platform or a rotating shaft to form a linear motion in the Y direction. By controlling the speed of the workpiece and the magnitude of the laser energy density, groove structures of different depths can be processed. As shown in Figure 10, due to the cooling effect of the liquid and the effect of laser-induced bubbles, the molten products can be promptly removed from the processing area, effectively reducing the heat-affected zone and suppressing the accumulation of processed products, thereby processing an array of groove structures with a large aspect ratio.

[0075] When the workpiece is in the form of a strip and roll, a large-format, multi-level groove structure can be processed in the manner shown in Figure 9. In Figure 9, the left half is the set laser processing path, and the right half is the set laser scanning direction. The laser scans in the Y direction, and with the workpiece moving in the X direction, multiple grooves can be processed.

[0076] When processing multiple multi-level groove structures simultaneously, the principle of multiple laser spot overlap is shown in Figure 11. In Figure 11, x represents the set laser processing x-direction, y represents the set laser processing y-direction, Δx represents the center distance between two adjacent laser spots in the laser processing x-direction, Δy represents the center distance between two adjacent laser spots in the laser processing y-direction, dl represents the center distance between two adjacent laser spots during laser processing, and c ijLet represent the laser spot in the i-th row and j-th column, where i is an integer from 1 to m and j is an integer from 1 to n. m represents the maximum number of laser spots in the y-direction and n represents the maximum number of laser spots in the x-direction.

[0077] The method for preparing the absorbent core provided by this invention has the following advantages:

[0078] (1) Liquid-assisted laser-processed wicks have higher capillary force, pattern resolution, and surface smoothness compared to samples prepared by laser modification in air; (2) The ultra-high scanning speed of the laser galvanometer combined with multi-channel laser scanning patterns can realize the simultaneous preparation of multiple wicks, greatly improving the preparation efficiency of wicks; (3) The design of the double-nested water tank, combined with the ultra-high scanning speed of the laser galvanometer and the interval scanning patterns, enables the liquid-air composite processing of wicks to be completed in one step without secondary processing, greatly improving the processing efficiency; (4) The one-step liquid-air composite laser processing of wicks significantly improves the performance compared to wicks prepared simply in air; (5) The aluminum-based sheet to be processed is controlled by a rotary motor to pass through the gap above the second tank into the liquid-assisted processing area, and after passing through the gap, it enters the air-assisted processing area. Finally, the prepared wicks are rolled up and packaged by the rotary motor, optimizing the workpiece assembly process and greatly improving the processing efficiency; (6) The gap is formed by the sealing connection of the first connecting part and the second connecting part, optimizing the assembly process of the workpiece to be processed and improving the processing efficiency. In summary, this invention significantly improves the efficiency of liquid-absorbing core preparation through a one-step method, multi-channel laser scanning, and optimization of the workpiece fixing process, enabling high-efficiency mass production. By combining liquid assistance and air, liquid-absorbing core structures with high capillary force and high surface flatness can be prepared.

[0079] Example 5.

[0080] As shown in Figure 12, the difference between this embodiment and Embodiment 2 is that it also includes a line electrode 9. A line electrode 9 is added at the edge of the laser beam's trajectory. The line electrode 9 is used as the cathode. As shown in Figure 13, the workpiece 2 is used as the anode. The anode is connected to the negative terminal of the pulse power supply 10, and the cathode is connected to the positive terminal of the pulse power supply 10. The liquid 6 is selected as a sodium nitrate solution (the liquid 6 can be a neutral electrolyte and is not limited to a sodium nitrate solution). By utilizing the combined effect of the generated electric field and the laser field, the material removal speed and surface quality of the processing area are improved.

[0081] Figure 12 shows a slot added to the frame to hold the wire electrode 9, which is used for electrolytic-assisted laser processing. The ultra-thin liquid-absorbing core has higher capillary force, pattern resolution, and surface smoothness in composite liquid, air, and electrochemical composite processing.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An overflow groove for assisting in the preparation of a liquid-absorbing core, characterized in that, It includes a second tank, an inlet pipe, and a frame. The inlet pipe connects the second tank to the outside of the overflow tank. The frame and the second tank are quadrilaterals of the same shape when viewed from above. The two non-adjacent sides of the frame and the two non-adjacent sides of the second tank are sealed together. There are gaps between the other two sides of the frame and the other two sides of the second tank. The gaps are used to accommodate the workpiece to be processed when assisting in the preparation of the liquid suction core. The height of the gap is greater than the thickness of the workpiece. The height of the gap is also less than the maximum height that ensures the liquid will not flow out of the gap while accommodating the workpiece. An overflow port is provided on the frame. When the workpiece is accommodated in the gap and liquid is introduced into the inlet pipe, the upper surface of the workpiece is covered with a liquid film.

2. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 1, characterized in that, It also includes a first connecting part and a second connecting part; In the auxiliary preparation of the liquid absorption core, the movement direction of the workpiece to be processed is the X direction, and the direction perpendicular to the movement direction on the plane of the workpiece is the Y direction. The frame and the second tank are both rectangular. There are two second connecting parts, which are respectively located at the top of the two sides of the second tank in the Y direction. There are two first connecting parts, which are respectively located at the bottom of the two sides of the frame in the Y direction. The first connecting parts and the corresponding second connecting parts are sealed together. The gap is located between the two sides of the frame in the X direction and the two sides of the corresponding second tank in the X direction. There are two gaps in total. The first connecting part is a protrusion, and the second connecting part is a recess, with the protruding structure in the protrusion and the recessed structure in the recess cooperating.

3. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 1, characterized in that, It also includes the first tank and the outlet pipe; The second tank is located inside and above the first tank, and the liquid outlet pipe connects the first tank and the outside of the overflow tank.

4. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 2, characterized in that, The overflow outlet is located on the surface of the frame where the next gap is located in the X direction.

5. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 2, characterized in that, The width of the overflow port is the distance between the two inner walls of the frame in the Y direction.

6. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 1, characterized in that, The inlet pipe also passes through the wall of the first tank.

7. The overflow groove for assisting in the preparation of the liquid-absorbing core according to claim 1, characterized in that, The maximum height at which liquid will not leak out of the gap while accommodating the workpiece is 0.5 mm.

8. A method for preparing a liquid-absorbing core based on the overflow groove according to any one of claims 1 to 7, characterized in that, include: Pull the workpiece out from the winding mechanism, then pass the workpiece through the two gaps in the X direction, and then fix one end of the workpiece to the winding mechanism. Connect the inlet pipe to the liquid pump and inject liquid into the overflow tank to ensure that the liquid film covers the upper surface of the workpiece; The winding mechanism is opened, which drives the workpiece to move along the X direction. At the same time, the laser is turned on, and the primary groove structure is processed on the workpiece under the liquid film by the laser. The secondary groove structure is also processed on the workpiece under the liquid film by the laser. After the part of the workpiece to be processed comes out of the liquid film, a secondary microgroove structure is processed in the air by laser to obtain a liquid-absorbing core with a multi-level groove structure.

9. The method for preparing the absorbent core according to claim 8, characterized in that, Before opening the winding mechanism and the laser, the process also includes setting a cathode at the edge of the preset laser beam motion trajectory, using the workpiece as the anode, connecting the anode to the negative terminal of the pulse power supply, and connecting the cathode to the positive terminal of the pulse power supply. The liquid in question is a neutral electrolyte.

10. The method for preparing the absorbent core according to claim 9, characterized in that, The neutral electrolyte includes a sodium nitrate solution.

Images