Hollow thin liquid cooling metal cooling fin and preparation process thereof

Abstract

The invention discloses a hollow sheet liquid cooling metal cooling fin and a preparation process thereof, and belongs to the technical field of cold plate heat dissipation, and the hollow sheet liquid cooling metal cooling fin is characterized by sequentially comprising an upper sealing layer, an upper flow guide honeycomb layer with honeycomb holes, a middle flow guide honeycomb layer with honeycomb holes, a lower flow guide honeycomb layer with honeycomb holes and a lower sealing layer from top to bottom, the liquid-cooled metal cooling fin not only can dissipate heat through the contact surface of the surface, but also can dissipate heat through flowing of the liquid in the liquid-cooled metal cooling fin, is excellent in heat dissipation effect, and can be applied to many occasions due to the thin thickness; the preparation process has the effects of high production efficiency, high workpiece precision, simplicity and convenience in operation and lower cost for producing the liquid cooling metal radiating fin.

Description

Technical Field

[0001] The present application relates to the field of cold plate heat dissipation technology, and more specifically to a hollow thin-sheet liquid-cooled metal heat sink and a preparation process thereof. Background Art

[0002] A heat sink is a device that dissipates heat from heat-prone electronic components in electrical appliances. It is usually made of aluminum alloy, brass or bronze in the form of plates, sheets, or multiple sheets. For example, the CPU in a computer uses a fairly large heat sink, as do the power tubes, line tubes, and amplifier tubes in a TV. Generally, a heat sink should be coated with a layer of thermal conductive silicone grease on the contact surface between the electronic component and the heat sink during use, so that the heat generated by the components can be more effectively transferred to the heat sink, and then dissipated to the surrounding air through the heat sink.

[0003] At present, most heat sinks are solid and only rely on their material and thickness to solve the heat dissipation problem. Their structure is simple and the heat dissipation effect can only be increased by increasing the number of heat sinks.

[0004] In view of this, the inventors have designed a thin metal heat sink that uses liquid cooling and a preparation process thereof. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hollow thin-sheet liquid-cooled metal heat sink and a preparation process thereof, which has the advantages that the liquid-cooled metal heat sink can not only dissipate heat through the contact surface on its surface, but also dissipate heat through the flow of liquid inside it, with excellent heat dissipation effect and a wide range of applications due to its thin thickness. The preparation process has the effects of high production efficiency, high workpiece precision, simple operation and low cost in the production of the liquid-cooled metal heat sink.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a hollow thin-sheet liquid-cooled metal heat sink, which comprises, from top to bottom, an upper sealing layer, an upper guide honeycomb layer with honeycomb holes, a middle guide honeycomb layer with honeycomb holes, a lower guide honeycomb layer with honeycomb holes, and a lower sealing layer, the honeycomb holes of the upper guide honeycomb layer are staggered with the honeycomb holes of the middle guide honeycomb layer, the honeycomb holes of the lower guide honeycomb layer are staggered with the honeycomb holes of the middle guide honeycomb layer, one end of the upper guide honeycomb layer, the middle guide honeycomb layer, and the lower guide honeycomb layer are all provided with inlet guide grooves communicating with the adjacent honeycomb holes therein, the upper guide honeycomb layer, the middle guide honeycomb layer, and the lower guide honeycomb layer are all provided with outlet guide grooves communicating with the adjacent honeycomb holes therein at one end away from the inlet guide groove, the three inlet guide grooves together form an inlet guide channel, and the three outlet guide grooves together form an outlet guide channel.

[0007] By adopting the above technical solution, when a liquid-cooled metal heat sink is needed, the external water inlet pipe can be connected to the inlet guide channel, and the external water outlet pipe can be connected to the outlet guide channel; when the liquid-cooled metal heat sink is working, the liquid flows from the external water inlet pipe to the inlet guide channel, and then flows through the interlaced upper guide honeycomb layer, middle guide honeycomb layer, and lower guide honeycomb layer, and finally flows through the outlet guide channel to the external water outlet pipe, so as to perform efficient heat dissipation.

[0008] In summary, the upper guide honeycomb layer, the middle guide honeycomb layer, and the lower guide honeycomb layer form a liquid-cooled metal heat sink under the combination of the upper sealing layer and the lower sealing layer, and the upper guide honeycomb layer, the middle guide honeycomb layer, and the lower guide honeycomb layer flow liquid through mutually staggered honeycomb holes, and the heat conducted to the upper sealing layer, the upper guide honeycomb layer, the middle guide honeycomb layer, the lower guide honeycomb layer, and the lower sealing layer can be quickly dissipated through the liquid, thereby greatly improving the heat dissipation effect of the liquid-cooled metal heat sink, and the honeycomb holes of the upper guide honeycomb layer, the middle guide honeycomb layer, and the lower guide honeycomb layer are staggered, which can increase the overall structural firmness of the liquid-cooled metal heat sink.

[0009] It is further preferred in the present invention that the wall thickness of the upper sealing layer, the upper flow-guiding honeycomb layer, the middle flow-guiding honeycomb layer, the lower flow-guiding honeycomb layer and the lower sealing layer can all be 0.3-0.7 mm.

[0010] By adopting the above technical solution, the wall thickness of the upper sealing layer, the upper guide honeycomb layer, the middle guide honeycomb layer, the lower guide honeycomb layer and the lower sealing layer can be 0.3-0.7mm, which can make the overall thickness of the liquid-cooled metal heat sink thinner and can be used in a variety of applications.

[0011] The present invention further provides a process for preparing the aforementioned liquid-cooled metal heat sink, comprising the following steps:

[0012] S1. Select a metal sheet with a wall thickness of 0.3-0.7 mm;

[0013] S2. Using a stamping method, stamping is performed according to the shapes of the upper sealing layer, the upper guide honeycomb layer, the middle guide honeycomb layer, the lower guide honeycomb layer and the lower sealing layer to achieve the specified size and shape;

[0014] S3. Deburring the upper sealing layer, the upper guide honeycomb layer, the middle guide honeycomb layer, the lower guide honeycomb layer and the lower sealing layer by using a grinding process;

[0015] S4, stacking the lower sealing layer, the lower guide honeycomb layer, the middle guide honeycomb layer, the upper guide honeycomb layer and the upper sealing layer from bottom to top and placing them on a correction and fixing fixture for correction and fixing;

[0016] S5. Adopt a welding process to fixedly connect the layer edges of the lower sealing layer, lower diversion honeycomb layer, middle diversion honeycomb layer, upper diversion honeycomb layer, and upper sealing layer that are corrected and fixed on the correction and fixing fixture. Moreover, the three inlet diversion grooves jointly form an inlet diversion channel communicating with the outside, and the three outlet diversion grooves jointly form an outlet diversion channel communicating with the outside;

[0017] S6. Adopt a grinding process to grind the edges of the welded lower sealing layer, lower diversion honeycomb layer, middle diversion honeycomb layer, upper diversion honeycomb layer, and upper sealing layer to obtain a complete liquid-cooled metal heat sink;

[0018] The correction and fixing fixture includes a base with a U-shaped cross-section, a clamping member arranged at the open end of the base cross-section for clamping the liquid-cooled metal heat sink, a biasing spring arranged on the base and always applying a force towards the base direction to the clamping member, a pressing plate arranged at the upper end of the base for pressing the liquid-cooled metal heat sink against the lower end of the base, a limiting rod arranged above the pressing plate and slidably connected to the upper end of the base, a threaded rod rotatably arranged above the pressing plate and threadedly connected to the upper end of the base, and a correction rod vertically arranged at the upper end of the base for pressing against the side of the liquid-cooled metal heat sink. The plate surface shape of the pressing plate is the same as that of the liquid-cooled metal heat sink. The edge of the pressing plate is 2 mm smaller than the edge of the liquid-cooled metal heat sink. A receiving plate with the same shape, size, and alignment as the plate surface of the pressing plate is arranged at the lower end of the base.

[0019] The operation of the correction and fixing fixture in step S4 of the present invention specifically includes:

[0020] S41. Install the correction rod at the upper end of the base, and then pull the clamping member to move away from the base;

[0021] S42. Stack the lower sealing layer, lower diversion honeycomb layer, middle diversion honeycomb layer, upper diversion honeycomb layer, and upper sealing layer in sequence to form a liquid-cooled metal heat sink and place it on the upper surface of the lower end of the base, and tilt it towards one end of the correction rod, so that the liquid-cooled metal heat sink abuts against the correction rod under its own gravity. Then release the clamping member, and the clamping member moves towards the base under the action of the biasing spring and presses the liquid-cooled metal heat sink against the side wall of the base, thereby aligning the edges of the lower sealing layer, lower diversion honeycomb layer, middle diversion honeycomb layer, upper diversion honeycomb layer, and upper sealing layer, and aligning the center of the liquid-cooled metal heat sink with the center of the pressing plate;

[0022] S43. Rotate the threaded rod so that the threaded rod moves towards the pressing plate direction and drives the pressing plate to move downward, and finally fixedly clamp the liquid-cooled metal heat sink between the pressing plate and the receiving plate;

[0023] S44. Disconnect the correction rod from the base, and then the welding process can be performed on the liquid-cooled metal heat sink.

[0024] In summary, the present invention has the following advantages:

[0025] The liquid-cooled metal heat sink can not only dissipate heat through the contact surface on its surface, but also dissipate heat through the flow of the liquid inside it. It has excellent heat dissipation effect and has a wide range of applications due to its thin thickness. Its preparation process and unique fixture have the effects of high production efficiency, high workpiece precision, simple operation and low cost for the production of the liquid-cooled metal heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the liquid-cooled metal heat sink of this embodiment;

[0027] Figure 2 is a schematic diagram of the exploded structure of the liquid-cooled metal heat sink of this embodiment;

[0028] Figure 3 is a schematic diagram of the overall structure of the correction and fixing fixture of this embodiment;

[0029] Figure 4 is a schematic cross-sectional structural diagram of the correction and fixing fixture of this embodiment;

[0030] Figure 5 It is a schematic diagram of the structure of the installation of the liquid-cooled metal heat sink in this embodiment.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. upper sealing layer; 2. upper flow guide honeycomb layer; 3. middle flow guide honeycomb layer; 4. lower flow guide honeycomb layer; 5. lower sealing layer; 6. honeycomb hole; 7. inlet guide groove; 8. outlet guide groove; 9. inlet guide channel; 10. outlet guide channel; 11. base; 12. clamping member; 13. force spring; 14. clamping plate; 15. limit rod; 16. threaded rod; 17. correction rod; 18. receiving plate; 19. marking groove. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] A hollow thin liquid-cooled metal heat sink, such as Figure 1 , 2As shown, from top to bottom, it includes an upper sealing layer 1, an upper flow guiding honeycomb layer 2 having honeycomb holes 6, a middle flow guiding honeycomb layer 3 having honeycomb holes 6, a lower flow guiding honeycomb layer 4 having honeycomb holes 6, and a lower sealing layer 5. The honeycomb holes 6 of the upper flow guiding honeycomb layer 2 are staggered with the honeycomb holes 6 of the middle flow guiding honeycomb layer 3, and the honeycomb holes 6 of the lower flow guiding honeycomb layer 4 are staggered with the honeycomb holes 6 of the middle flow guiding honeycomb layer 3. One end of the upper flow guiding honeycomb layer 2, the middle flow guiding honeycomb layer 3, and the lower flow guiding honeycomb layer 4 are all provided with an inlet guide groove 7 communicating with the adjacent honeycomb holes 6 therein. The upper guide honeycomb layer 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4 are all provided with outlet guide grooves 8 communicating with the adjacent honeycomb holes 6 inside the upper guide grooves 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4 at one end away from the inlet guide groove 7, the three inlet guide grooves 7 together form an inlet guide channel 9, the three outlet guide grooves 8 together form an outlet guide channel 10, the inlet guide channel 9 and the outlet guide channel 10 are both located on the same side of the extension of the liquid-cooled metal heat sink, and the upper sealing layer 1 and the lower sealing layer 5 are both provided with marking grooves 19 on one side away from the middle guide honeycomb layer 3, and the marking grooves 19 are located on the same side of the inlet guide channel 9 and the outlet guide channel 10.

[0034] When a liquid-cooled metal heat sink is needed, the external water inlet pipe can be connected to the inlet guide channel 9, and the external water outlet pipe can be connected to the outlet guide channel 10; when the liquid-cooled metal heat sink is working, the liquid flows from the external water inlet pipe to the inlet guide channel 9, and then flows through the interlaced upper guide honeycomb layer 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4, and finally flows to the external water outlet pipe through the outlet guide channel 10, so as to perform efficient heat dissipation.

[0035] Furthermore, the wall thickness of the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4 and the lower sealing layer 5 can all be 0.7 mm, which can make the overall thickness of the liquid-cooled metal heat sink thinner and can be used in a variety of applications.

[0036] The present invention further provides a process for preparing the aforementioned liquid-cooled metal heat sink, comprising the following steps:

[0037] S1, select a metal plate with a wall thickness of 0.7 mm;

[0038] S2, using a stamping method, stamping and forming the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4 and the lower sealing layer 5 according to their shapes to achieve the specified size and shape;

[0039] S3, using a grinding process to deburr the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4 and the lower sealing layer 5;

[0040] S4, stacking the lower sealing layer 5, the lower guide honeycomb layer 4, the middle guide honeycomb layer 3, the upper guide honeycomb layer 2 and the upper sealing layer 1 from bottom to top and placing them on a correction and fixing fixture for correction and fixing;

[0041] S5. Using welding technology, the lower sealing layer 5, the lower guide honeycomb layer 4, the middle guide honeycomb layer 3, the upper guide honeycomb layer 2 and the upper sealing layer 1 which are corrected and fixed on the correction and fixing fixture are fixedly connected, and the three inlet guide grooves 7 together form an inlet guide channel 9 which is the same as the outside, and the three outlet guide grooves 8 together form an outlet guide channel 10 which is the same as the outside;

[0042] S6. Grinding the welded lower sealing layer 5, the lower guide honeycomb layer 4, the middle guide honeycomb layer 3, the upper guide honeycomb layer 2 and the edges of the upper sealing layer 1 to obtain a complete liquid-cooled metal heat sink;

[0043] like Figure 3 , 4 As shown, the correction and fixing fixture includes a base 11 with a U-shaped cross section, a clamping member 12 slidably mounted on the lower end of the cross-sectional opening of the base 11 and used to tighten the liquid-cooled metal heat sink, a force spring 13 mounted on the base 11 and always applying a force toward the base 11 to the clamping member 12, a clamping plate 14 mounted on the upper end of the base 11 and used to press the liquid-cooled metal heat sink against the lower end of the base 11, a limiting rod 15 mounted above the clamping plate 14 and slidably connected to the upper end of the base 11, and a threaded rod 16 rotatably mounted above the clamping plate 14 and threadedly connected to the upper end of the base 11. And a correction rod 17 vertically installed on the upper end of the base 11 and used to press against the side of the liquid-cooled metal heat sink. The plate surface shape of the pressing plate 14 is the same as the plate surface shape of the liquid-cooled metal heat sink. The edge of the pressing plate 14 is 2mm smaller than the edge of the liquid-cooled metal heat sink. The lower end of the base 11 is provided with a receiving plate 18 that is consistent with and aligned with the plate surface shape of the pressing plate 14. The vertical end of the base 11 is smaller than the liquid-cooled metal heat sink, and the liquid-cooled metal heat sink is clamped between the vertical end of the base 11 and the clamping piece 12. One end of the force spring 13 is connected to the base 11, and the other end is connected to the clamping piece 12.

[0044] Since the liquid-cooled metal heat sink needs to be welded on the edges except for those with the inlet guide channel 9 and the outlet guide channel 10 during the preparation process, simple clamping can easily cause the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4 and the lower sealing layer 5 to overlap and offset, resulting in misalignment of welding points and low production efficiency. Therefore, the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4 and the lower sealing layer 5 are first corrected and clamped and fixed by a correction and fixing fixture, and the edges of the liquid-cooled metal heat sink except for those with the inlet guide channel 9 and the outlet guide channel 10 are exposed, which can facilitate the welding of the liquid-cooled metal heat sink, thereby achieving the effects of improving production efficiency, high workpiece preparation accuracy, simple operation and low cost.

[0045] like Figure 5 As shown, the operation of calibrating and fixing the fixture in step S4 of the present invention specifically includes:

[0046] S41, installing the correction rod 17 on the upper end of the base 11, and then pulling the clamping member 12 to move away from the base 11;

[0047] S42, stack the lower sealing layer 5, the lower guide honeycomb layer 4, the middle guide honeycomb layer 3, the upper guide honeycomb layer 2 and the upper sealing layer 1 in sequence to form a liquid-cooled metal heat sink and place it on the upper surface of the lower end of the base 11, and make the marking groove 19 face the correction rod 17, then tilt it toward one end of the correction rod 17, so that the liquid-cooled metal heat sink is pressed against the correction rod 17 under the action of its own gravity, and then release the clamping member 12, and the clamping member 12 moves toward the base 11 under the action of the force spring 13 and presses the liquid-cooled metal heat sink against the side wall of the base 11, so that the edges of the lower sealing layer 5, the lower guide honeycomb layer 4, the middle guide honeycomb layer 3, the upper guide honeycomb layer 2 and the upper sealing layer 1 are aligned, and the center of the liquid-cooled metal heat sink is aligned with the center of the pressing plate 14;

[0048] S43, rotating the threaded rod 16 so that the threaded rod 16 moves toward the abutting plate 14 and drives the abutting plate 14 to move downward, and finally fixing and tightening the liquid-cooled metal heat sink between the abutting plate 14 and the receiving plate 18;

[0049] S44, separate the correction rod 17 from the base 11, and then perform the welding process on the liquid-cooled metal heat sink.

[0050] The working process and beneficial effects of the present invention are as follows:

[0051] A liquid-cooled metal heat sink is formed by combining the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4 with the upper sealing layer 1 and the lower sealing layer 5, and the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4 flow liquid through the mutually staggered honeycomb holes 6, so that the heat conducted to the upper sealing layer 1, the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, the lower guide honeycomb layer 4, and the lower sealing layer 5 can be quickly dissipated through the liquid, which greatly improves the heat dissipation effect of the liquid-cooled metal heat sink, and the honeycomb holes 6 of the upper guide honeycomb layer 2, the middle guide honeycomb layer 3, and the lower guide honeycomb layer 4 are staggered, which can increase the overall structural firmness of the liquid-cooled metal heat sink.

[0052] And for the preparation process of liquid-cooled metal heat sinks, the production efficiency can be greatly improved, the workpiece precision is high, the operation is simple, and the cost is low.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A hollow thin liquid-cooled metal heat sink, characterized in that: The invention comprises, from top to bottom, an upper sealing layer (1), an upper flow-guiding honeycomb layer (2) having honeycomb holes (6), a middle flow-guiding honeycomb layer (3) having honeycomb holes (6), a lower flow-guiding honeycomb layer (4) having honeycomb holes (6), and a lower sealing layer (5), wherein the honeycomb holes (6) of the upper flow-guiding honeycomb layer (2) and the honeycomb holes (6) of the middle flow-guiding honeycomb layer (3) are arranged in a staggered manner, the honeycomb holes (6) of the lower flow-guiding honeycomb layer (4) and the honeycomb holes (6) of the middle flow-guiding honeycomb layer (3) are arranged in a staggered manner, and the upper flow-guiding honeycomb layer (2) and the middle flow-guiding honeycomb layer (3) are arranged in a staggered manner. One end of each of the upper and lower guide honeycomb layers (2), the middle guide honeycomb layer (3), and the lower guide honeycomb layer (4) is provided with an inlet guide groove (7) communicating with the adjacent honeycomb holes (6) therein; one end of each of the upper and lower guide honeycomb layers (2), the middle guide honeycomb layer (3), and the lower guide honeycomb layer (4) away from the inlet guide groove (7) is provided with an outlet guide groove (8) communicating with the adjacent honeycomb holes (6) therein; the three inlet guide grooves (7) together form an inlet guide channel (9), and the three outlet guide grooves (8) together form an outlet guide channel (10).

2. A hollow thin-sheet liquid-cooled metal heat sink according to claim 1, characterized in that: The wall thicknesses of the upper sealing layer (1), the upper flow-guiding honeycomb layer (2), the middle flow-guiding honeycomb layer (3), the lower flow-guiding honeycomb layer (4) and the lower sealing layer (5) can all be 0.3-0.7 mm.

3. A process for preparing a hollow thin-sheet liquid-cooled metal heat sink, used for preparing the liquid-cooled metal heat sink as claimed in any one of claim 12, characterized in that: The preparation process includes: S1. Select a metal sheet with a wall thickness of 0.3-0.7 mm; S2, using a stamping method to stamp and form the upper sealing layer (1), the upper flow-guiding honeycomb layer (2), the middle flow-guiding honeycomb layer (3), the lower flow-guiding honeycomb layer (4) and the lower sealing layer (5) according to their shapes, so that they reach a specified size and shape; S3, using a grinding process to remove burrs from the upper sealing layer (1), the upper flow-guiding honeycomb layer (2), the middle flow-guiding honeycomb layer (3), the lower flow-guiding honeycomb layer (4) and the lower sealing layer (5); S4, stacking the lower sealing layer (5), the lower guide honeycomb layer (4), the middle guide honeycomb layer (3), the upper guide honeycomb layer (2) and the upper sealing layer (1) in order from bottom to top and placing them on a correction and fixing fixture for correction and fixing; S5. Using a welding process, the lower sealing layer (5), the lower flow guide honeycomb layer (4), the middle flow guide honeycomb layer (3), the upper flow guide honeycomb layer (2), and the upper sealing layer (1) which are corrected and fixed on the correction and fixing fixture are fixedly connected, and the three inlet guide grooves (7) together form an inlet guide channel (9) which is the same as the outside, and the three outlet guide grooves (8) together form an outlet guide channel (10) which is the same as the outside; S6. Using a grinding process, the edges of the welded lower sealing layer (5), the lower guide honeycomb layer (4), the middle guide honeycomb layer (3), the upper guide honeycomb layer (2) and the upper sealing layer (1) are ground to obtain a complete liquid-cooled metal heat sink; The calibration and fixing fixture includes a base (11) with a U-shaped cross-section, a clamping member (12) arranged at one end of the open cross-section of the base (11) and used to clamp the liquid-cooled metal heat sink, a biasing spring (13) arranged on the base (11) and always applying a force towards the base (11) to the clamping member (12), a pressing plate (14) arranged at the upper end of the base (11) and used to press the liquid-cooled metal heat sink against the lower end of the base (11), a limiting rod (15) arranged above the pressing plate (14) and slidably connected to the upper end of the base (11), a threaded rod (16) rotatably arranged above the pressing plate (14) and threadedly connected to the upper end of the base (11), and a calibration rod (17) vertically arranged at the upper end of the base (11) and used to press against the side of the liquid-cooled metal heat sink. The plate surface shape of the pressing plate (14) is the same as that of the liquid-cooled metal heat sink. The edge of the pressing plate (14) is 2 mm smaller than the edge of the liquid-cooled metal heat sink. A receiving plate (18) with the same shape, size and alignment as the plate surface of the pressing plate (14) is arranged at the lower end of the base (11).

4. The process for preparing a hollow thin-sheet liquid-cooled metal heat sink according to claim 3, characterized in that: The operation of the calibration and fixing fixture in step S4 specifically includes: S41. Install the calibration rod (17) at the upper end of the base (11), and then pull the clamping member (12) to move away from the base (11). S42. Stack the lower sealing layer (5), lower diversion honeycomb layer (4), middle diversion honeycomb layer (3), upper diversion honeycomb layer (2) and upper sealing layer (1) in sequence to form a liquid-cooled metal heat sink and place it on the upper surface of the lower end of the base (11), and tilt it towards one end of the calibration rod (17), so that the liquid-cooled metal heat sink is pressed against the calibration rod (17) under its own gravity. Then release the clamping member (12), and the clamping member (12) moves towards the base (11) under the action of the biasing spring (13) and presses the liquid-cooled metal heat sink against the side wall of the base (11), so that the edges of the lower sealing layer (5), lower diversion honeycomb layer (4), middle diversion honeycomb layer (3), upper diversion honeycomb layer (2) and upper sealing layer (1) are aligned, and the center of the liquid-cooled metal heat sink is aligned with the center of the pressing plate (14). S43. Rotate the threaded rod (16) so that the threaded rod (16) moves towards the pressing plate (14) and drives the pressing plate (14) to move downward, and finally fix and clamp the liquid-cooled metal heat sink between the pressing plate (14) and the receiving plate (18). S44. Disconnect the calibration rod (17) from the base (11), and then the welding process can be carried out on the liquid-cooled metal heat sink.

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