Tool for producing special-shaped metal cold plate and production process

Abstract

The invention provides a tool for producing a special-shaped metal cold plate and a production process, the tool for producing the special-shaped metal cold plate comprises an upper mold and a lower mold, a guide mechanism is arranged between the upper mold and the lower mold, and the guide mechanism is used for ensuring that the upper mold can move in a reciprocating mode relative to the lower mold in the fixed direction; the upper die is provided with a plurality of first pressing columns and an upper oil pipe which are connected, the first pressing columns are located on the lower portion of the upper die, the lower die is provided with a plurality of second pressing columns and a lower oil pipe which are connected, and the second pressing columns are located on the upper portion of the lower die. And the first pressing column and the second pressing column are matched with each other and are used for forming a curved surface of the metal cold plate at a high temperature after diffusion welding. In the heating process in a one-time overspeed forming furnace, the tool can be used for conducting hot-pressing diffusion welding on a plurality of plates, curved surface or special shape forming of the cold plate radiator is achieved by adjusting the distance between the pressing columns at the welding temperature, and a plurality of production steps are omitted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a tool for producing a special-shaped metal cold plate and a production process. BACKGROUND

[0002] A heat dissipation cold plate is a heat sink composed of metal plates stacked and formed by etching or machining, and then composed by diffusion welding, which has the advantages of high and low temperature resistance, high pressure resistance, compact structure, small volume, high heat transfer area density, and is not easy to leak, and is widely used in data centers and AI computing, electric vehicles and power batteries, industrial precision equipment, aerospace and telecommunications equipment, etc.

[0003] Metal cold plates are one of the core equipment of the system, usually in the form of regular cubic structure with straight channels, serpentine channels or parallel channels, and the outer wall directly contacts with CPU / GPU, power pump and other heat generating elements, and the circulating cooling liquid in the flow channel is used to quickly remove heat, and the flow channel size is generally less than 2mm and the heat transfer efficiency is high. Therefore, the Chinese patent with application number 201911053698.2 discloses a clamping tool and method for liquid cooling heat dissipation cold plate, which comprises a tool cover plate, a tool bottom plate, a plurality of connecting devices, a plurality of pads and a plurality of identical high temperature springs; the tool bottom plate is horizontally placed; the liquid cooling heat dissipation cold plate is placed on the tool bottom plate; the pads are evenly placed on the liquid cooling heat dissipation cold plate; the tool cover plate is arranged above the pads, and the high temperature springs are elastically connected between the tool cover plate and the pads; the connecting devices are fixedly connected between the tool cover plate and the tool bottom plate, and are used for adjusting the distance between the tool cover plate and the tool bottom plate, and the high temperature springs and the pads are used to apply a pressing force to the liquid cooling heat dissipation cold plate to clamp the liquid cooling heat dissipation cold plate. Although this scheme can improve the yield of the heat dissipation cold plate, it cannot be used to produce special-shaped heat dissipation cold plates.

[0004] At present, special-shaped metal cold plates are mostly machined or molded after diffusion welding, which not only has many production steps, long time consumption and large resource loss. Therefore, the present application is proposed. SUMMARY

[0005] The present application solves the problem of long production process and many steps of existing special-shaped metal cold plates.

[0006] To solve the above problems, the application provides a tool for producing a special-shaped metal cold plate, which comprises an upper die and a lower die, a guide mechanism is arranged between the upper die and the lower die, which is used for ensuring that the upper die can reciprocate along a fixed direction relative to the lower die; the upper die is provided with a first pressing column and an oil pipe connected therewith, the first pressing column is provided in a plurality of and located at the lower part of the upper die, the lower die is provided with a second pressing column and a lower oil pipe connected therewith, the second pressing column is provided in a plurality of and located at the upper part of the lower die, and the first pressing column and the second pressing column are matched with each other and used for forming the metal cold plate into a curved surface at high temperature after diffusion welding.

[0007] Preferably, the guide mechanism comprises a slidingly assembled guide rail and a guide column, wherein the guide rail is fixed on one of the upper die and the lower die, and the guide sleeve is fixed on the other one of the upper die and the lower die.

[0008] Preferably, the guide mechanism is provided in a plurality of and arranged at intervals along the circumferential side of the upper die.

[0009] Preferably, the tool for producing the special-shaped metal cold plate further comprises a limiting structure, which is located on the guide structure and used for preventing the upper die from being excessively displaced.

[0010] Preferably, the second pressing column is located at a position corresponding to the first pressing column on the lower die and arranged in a mode of m*n, wherein the values of m and n are respectively 2-5 and 3-10.

[0011] Preferably, the first pressing column comprises an upper pressing head and a lower pressing head connected therewith, a heat insulation block is arranged in the upper pressing head, the heat insulation block is connected with the lower pressing head, a piston cavity is formed between the heat insulation block and the upper pressing head, the oil pipe is communicated with the piston cavity, and the piston cavity is used for inputting a predetermined amount of hydraulic oil into the piston cavity to drive the lower pressing head to move downward.

[0012] Preferably, the tool for producing the special-shaped metal cold plate further comprises an upper heat insulation layer and a lower heat insulation layer, the upper heat insulation layer is located at the lower side of the upper die, the first pressing column partially penetrates through the upper heat insulation layer, the lower heat insulation layer is located at the lower side of the lower die, and the second pressing column partially penetrates through the lower heat insulation layer.

[0013] The application further provides a production process of a special-shaped metal cold plate, which comprises the following steps:

[0014] S1, a first graphite tool is assembled on an ultrasonic forming furnace assembly platform, and a solder resist is uniformly sprayed on the surface of the first graphite tool;

[0015] S2, the lower die is centrally placed on the first graphite tool, then a flat plate cold plate is stacked on the lower die, the upper die is assembled to the lower die through the guide mechanism, and then the second graphite tool is placed on the upper die.

[0016] S3, using the super-speed forming furnace assembly platform to transport the tooling and the material to be welded to the designated position inside the super-speed forming equipment;

[0017] S4, controlling the super-speed forming equipment to make the upper pressure surface contact the second graphite tooling and perform diffusion welding;

[0018] S5, adjusting the oil injection amount in the first pressure column and the second pressure column according to the preset parameters to make the upper mold and the lower mold complementary deformation under the condition that the operating parameters of the super-speed forming equipment remain unchanged, so as to realize the curved surface forming under high temperature.

[0019] Preferably, the flat plate cold plate in step S2 is pre-cleaned with anhydrous alcohol to remove oil stains.

[0020] Preferably, the welding pressure of the stainless steel material in step S4 is 10-20 MPa, the welding pressure of the titanium alloy material is 1-10 MPa, and the welding temperature is 700-800℃.

[0021] Compared with the prior art, the tooling and production process for producing special-shaped metal cold plates have the following beneficial effects: 1) the guide mechanism is used to ensure that the upper mold and the lower mold are always accurately centered during the closing process, avoiding uneven stress or pressure injury of the cold plate caused by misalignment, and ensuring the consistency of product thickness and welding pressure; 2) during the heating process in the super-speed forming furnace, the tooling is used to heat and press diffusion weld multiple plates, and at the welding temperature, the distance between the pressure columns is adjusted to realize the curved surface or special-shaped forming of the cold plate radiator, thereby saving multiple production steps; 3) simple structure, easy to produce and process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a whole schematic view of the tooling of the embodiment of the application;

[0023] Figure 2 It is a structural schematic view of the tooling and the super-speed forming furnace assembly of the embodiment of the application;

[0024] Figure 3 It is a longitudinal sectional view of the pressure column of the embodiment of the application;

[0025] Figure 4 It is a structural schematic view of the oil path of the embodiment of the application;

[0026] Figure 5 It is a schematic view of the preparation of the special-shaped welded cold plate using the tooling of the embodiment of the application;

[0027] Figure 6 It is another schematic view of the preparation of the special-shaped welded cold plate using the tooling of the embodiment of the application.

[0028] Reference signs:

[0029] 1, lower mold; 2, upper mold; 3, guide mechanism; 4, limiting structure; 5, first pressing column; 51, upper pressing head; 52, piston cavity; 53, heat insulation block; 54, lower pressing head; 6, second pressing column; 7, upper heat insulation layer; 8, lower heat insulation layer; 9, upper oil pipe; 10, lower oil pipe; 10-1, first oil path; 10-2, second oil path; 10-n, nth oil path. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. The technical features of the embodiments of the present application can be combined with each other without conflict.

[0031] With the continuous progress of modern electronic technology, high-power and high-integration electronic components (such as electric vehicle control unit, server CPU / GPU, power module new energy power converter, etc.) have been widely used in various fields. Liquid cooling technology is widely used in electronic component heat dissipation systems due to its high heat exchange efficiency, flexible arrangement and safety and reliability. Among them, the cold plate is a common heat dissipation structure in liquid cooling technology, which uses the flow of cooling liquid in the flow channel to carry away the heat generated by the heat source during work, and transfers the heat from the vicinity of the heat source to the heat sink or other heat exchange devices through circulation. In order to meet the requirements of different installation spaces, the application of special-shaped metal cold plates is becoming more and more widespread, but at present, the production is usually carried out after diffusion welding or machining or mold forming, and the production process is complex. Therefore, the applicant proposes the following technical scheme:

[0032] As shown in Figures 1-6 A tool for producing a special-shaped metal cold plate for producing a special-shaped metal cold plate, comprising an upper mold 1 and a lower mold 2, a guide mechanism 3 is arranged between the upper mold 1 and the lower mold 2, which is used to ensure that the upper mold 1 can reciprocate along the fixed direction relative to the lower mold 2; the upper mold 1 is provided with a first pressing column 5 and an upper oil pipe 9 connected thereto, the first pressing column 5 has a plurality of and is located at the lower part of the upper mold 1, the lower mold 2 is provided with a second pressing column 6 and a lower oil pipe 10 connected thereto, the second pressing column 6 has a plurality of and is located at the upper part of the lower mold 2, the first pressing column 5 and the second pressing column 6 cooperate to form a curved surface of the metal cold plate at high temperature after diffusion welding.

[0033] The scheme saves the steps of intermediate cooling, transfer, re-heating, etc. After diffusion welding, the first pressing column 5 and the second pressing column 6 can be adjusted to "mold" the flat plate cold plate into the required complex curved surface at high temperature, avoiding the internal stress change of the material due to cooling and re-heating, and being beneficial to obtaining a better weld and a formed piece; the guide mechanism 3 can ensure that the upper die 1 and the lower die 2 always keep accurate centering during the closing process, avoiding uneven stress or crushing of the cold plate due to misalignment, and ensuring the consistency of product thickness and welding pressure.

[0034] As an example of the present application, the guide mechanism 3 includes a slidingly assembled guide rail and a guide column, wherein the guide rail is fixed on one of the upper die 1 and the lower die 2, and the guide sleeve is fixed on the other one of the upper die 1 and the lower die 2.

[0035] This setting can force the upper die 1 to move downward along a unique and correct path before the guide sleeve during the closing process, avoiding the slight deviation caused by the weight of the die itself, the asynchronization of the hydraulic cylinder or installation errors; at the same time, the first pressing column 5 and the second pressing column 6 will generate a huge lateral force when extruding the workpiece during the stage of "diffusion welding and direct curved surface forming", and the high-rigidity frame formed by the guide mechanism 3 can effectively absorb and offset these lateral forces.

[0036] Preferably, the guide mechanism 3 has multiple and is arranged along the periphery of the upper die 1. This setting can make the upper die 1 always keep a high parallelism with the lower die 2 during the downward process, thereby ensuring that the workpiece is uniformly pressed and the forming quality is consistent; at the same time, the opening and closing actions of the die are more smooth, reducing the shaking and impact, and significantly improving the stability and life of the equipment operation.

[0037] As an example of the present application, the tool for producing special-shaped metal cold plate further includes a limiting structure 4 located on the guide structure 3 for preventing excessive displacement of the upper die 2.

[0038] This setting can avoid overpressure or underpressure caused by operation errors, sensor drift or hydraulic system fluctuations; overpressure can crush the workpiece runner and even make the product scrap, while underpressure can cause insufficient welding, resulting in insufficient product strength; when the thickness of the workpiece changes, only the limiting block of different height or the limiting bolt needs to be replaced to quickly set the new die stroke, without the need to reprogram complex control programs, improving the flexibility and changeover efficiency of the production line.

[0039] As an example of the present application, the displacement amount of the first pressure column 5 and the second pressure column 6 is the same or different. Preferably, the displacement amount of the first pressure column 5 and the second pressure column 6 is the same. This setting can make the atoms in the middle layer of the workpiece diffuse uniformly, avoid the quality defects of virtual welding, incomplete welding or different welding strength caused by uneven pressure; ensure the interchangeability and assembly accuracy of the products in batch production, and meet the strict requirements of the aviation, precision electronics and other fields on the size.

[0040] The second pressure column 6 is located at the corresponding position of the first pressure column 5 on the lower die 2 and arranged in the form of m*n, where the values of m and n are respectively 2-5 and 3-10. This setting can independently fine-tune the displacement and pressure of the first pressure column 5 and the second pressure column 6, automatically compensate for the micro-unevenness of the workpiece surface, and ensure that the pressure is uniformly distributed on the entire welding surface. At the same time, by changing the stroke of the first pressure column 5 and the second pressure column 6 at different coordinate positions, such as increasing the middle stroke to form a protrusion, and reducing the stroke at the edge to form a transition zone, a variety of curved cold plates can be produced by using one set of tooling, greatly improving the versatility of the equipment. According to the size of the cold plate, first pressure columns 5 and second pressure columns 6 of different diameters can be arranged, and the number of first pressure columns 5 and second pressure columns 6 can also be changed.

[0041] As an example of the present application, the first pressure column 5 includes a connected upper pressure head 51 and a lower pressure head 54, a heat insulation block 53 is arranged in the upper pressure head 51, the heat insulation block 53 is connected with the lower pressure head 54, a piston cavity 52 is formed between the heat insulation block 53 and the upper pressure head 51, and the upper oil pipe 9 is in communication with the piston cavity 52 for inputting a predetermined amount of hydraulic oil into the piston cavity 52 to drive the lower pressure head 54 to move downward.

[0042] This setting can ensure that heat is blocked in the lower pressure head 54 part, so that the upper pressure head 51 and the connected upper oil pipe 9 are always at a safe temperature, thereby keeping the related precision hydraulic control elements in a low-temperature safety area, greatly improving the life and reliability of these expensive elements. The upper pressure head 51 is located in the upper die 1, and the specific assembly relationship is the prior art. The second pressure column 6 has the same structure as the first pressure column 5, which will not be described here.

[0043] As an example of the present application, the lower oil pipe 10 includes a first oil path 10-1, a second oil path 10-2, and an nth oil path 10-n, which are respectively connected with the n columns of second pressure columns 6. This setting allows the system to independently adjust the oil pressure of each oil path as needed, such as detecting that the left side pressure is slightly smaller, and individually increasing the pressure of the oil path that controls the left side pressure column column, thereby achieving uniform distribution of pressure on the entire welding surface.

[0044] Preferably, the tool for producing the special-shaped metal cold plate further comprises a control module connected with the lower oil pipe 10 and the upper oil pipe 9 respectively, for controlling the oil pressure of each first pressing column 5 and second pressing column 6.

[0045] As an example of the present application, the tool for producing the special-shaped metal cold plate further comprises an upper heat insulation layer 7 and a lower heat insulation layer, the upper heat insulation layer 7 is located at the lower side of the upper die 1, and the first pressing column 5 partially penetrates through the upper heat insulation layer 7; the lower heat insulation layer 8 is located at the lower side of the lower die 2, and the second pressing column 6 partially penetrates through the lower heat insulation layer 8.

[0046] The arrangement can effectively block most of the heat from being transmitted to the root of the first pressing column 5 or the second pressing column 6, maintain the working environment temperature of the hydraulic system within a safe range, ensure that the working surface temperature of the upper die 1 and the lower die 2 is more uniform and stable, reduce the negative impact of temperature fluctuation on the diffusion welding quality, and improve the consistency of product quality. The material and thickness of the upper heat insulation layer 7 and the lower heat insulation layer 8 are adjusted according to the welding temperature range of the formed metal.

[0047] The present application also provides a production process of a special-shaped metal cold plate, comprising:

[0048] S1, uniformly spraying a solder resist on the surface of the first graphite tool on the super-speed forming furnace assembly platform;

[0049] S2, placing the lower die 2 in the center on the first graphite tool, then stacking the flat plate cold plate on the lower die 2, assembling the upper die 1 to the lower die 2 through the guide mechanism 3, and then placing the second graphite tool on the upper die;

[0050] S3, using the super-speed forming furnace assembly platform to transport the tool and the material to be welded to the designated position inside the super-speed forming equipment;

[0051] S4, controlling the super-speed forming equipment to make the upper pressure surface contact with the second graphite tool and perform diffusion welding;

[0052] S5, controlling the working pressure and temperature of the super-speed forming equipment to be unchanged, adjusting the oil injection amount in the first pressing column 5 and the second pressing column 6 according to the preset parameters to make the upper die 1 and the lower die 2 complementary deformation, so as to realize the curved surface forming at high temperature.

[0053] The present application uses a tool to heat and press diffusion weld multiple plate pieces in a super-speed forming furnace, and adjusts the distance between the pressing columns at the welding temperature to realize the curved surface or special-shaped forming of the cold plate radiator, thereby saving multiple production steps.

[0054] Preferably, the flat cold plate in step S2 is cleaned by wiping with anhydrous alcohol.

[0055] Preferably, the welding pressure of the stainless steel material in step S4 is 10-20 MPa, the welding pressure of the titanium alloy material is 1-10 MPa, and the welding temperature is 700-800℃.

[0056] Preferably, the production process of the shaped metal cold plate further comprises step S6: cooling in the furnace to 150℃ or below and discharging from the furnace.

[0057] Preferably, the production process of the shaped metal cold plate further comprises step S7: after shaping, the cold plate is connected to the tooling, and the product is subjected to a 1.1 times design pressure air test, and is qualified if there is no leakage.

[0058] Although the present application is disclosed as above, the present application is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the present application, can make various changes and modifications, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A tooling for producing irregularly shaped cold-rolled metal sheets, characterized in that, The upper mold (1) and the lower mold (2) are provided with a guide mechanism (3) between the upper mold (1) and the lower mold (2) to ensure that the upper mold (1) can reciprocate relative to the lower mold (2) in a fixed direction. The upper mold (1) is provided with a first pressure column (5) and an upper oil pipe (9) connected together. There are multiple first pressure columns (5) located at the lower part of the upper mold (1). The lower mold (2) is provided with a second pressure column (6) and a lower oil pipe (10) connected together. There are multiple second pressure columns (6) located at the upper part of the lower mold (2). The first pressure column (5) and the second pressure column (6) cooperate with each other to make the metal cold plate curved at high temperature after diffusion welding.

2. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 1, characterized in that, The guiding mechanism (3) includes a slidingly assembled guide rail and a guide post, wherein the guide rail is fixed on one of the upper mold (1) and the lower mold (2), and the guide sleeve is fixed on the other of the upper mold (1) and the lower mold (2).

3. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 2, characterized in that, The guide mechanism (3) has multiple parts and is arranged at intervals along the periphery of the upper mold (1).

4. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 3, characterized in that, The tooling for producing irregularly shaped cold-rolled metal sheets also includes a limiting structure (4), which is located on the guide structure (3) and is used to prevent the upper mold (2) from being displaced excessively.

5. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 1, characterized in that, The second pressure column (6) is located on the lower mold (2) at a position corresponding to the first pressure column (5) and is arranged in an m*n pattern, where the values ​​of m and n are 2-5 and 3-10, respectively.

6. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 5, characterized in that, The first pressure column (5) includes an upper pressure head (51) and a lower pressure head (54) connected together. A heat insulation block (53) is provided inside the upper pressure head (51). The heat insulation block (53) is connected to the lower pressure head (54). A piston chamber (52) is formed between the heat insulation block (53) and the upper pressure head (51). The upper oil pipe (9) is connected to the piston chamber (52) and is used to input a predetermined amount of hydraulic oil into the piston chamber (52) to drive the lower pressure head (54) to move downward.

7. The tooling for producing irregularly shaped cold-rolled metal sheets according to claim 1, characterized in that, The tooling for producing irregularly shaped cold-rolled metal sheets also includes an upper heat insulation layer (7) and a lower heat insulation layer. The upper heat insulation layer (7) is located on the lower side of the upper mold (1). The first pressure column (5) partially passes through the upper heat insulation layer (7). The lower heat insulation layer (8) is located on the lower side of the lower mold (1). The second pressure column (6) partially passes through the lower heat insulation layer (8).

8. A manufacturing process for irregularly shaped cold-rolled metal sheets, characterized in that, include: S1. Place the first graphite fixture on the assembly platform of the high-speed forming furnace, and uniformly spray solder resist on the surface of the first graphite fixture. S2. Place the lower mold (2) in the center on the first graphite fixture, then stack the flat cold plate on the lower mold (2), assemble the upper mold (1) onto the lower mold (2) through the guide mechanism (3), and then place the second graphite fixture on the upper mold. S3. Use the high-speed prototyping furnace assembly platform to transport the tooling and materials to be welded to the designated position inside the high-speed prototyping equipment. S4. Control the high-speed forming equipment to make its upper pressure surface contact the second graphite tooling and perform diffusion welding; S5. Control the working pressure and temperature of the high-speed forming equipment to remain unchanged, and adjust the amount of oil injected into the first pressure column (5) and the second pressure column (6) according to the preset parameters so that the upper mold (1) and the lower mold (2) can be deformed in a complementary manner, thereby realizing the curved surface forming at high temperature.

9. The manufacturing process of the irregularly shaped cold-rolled metal plate according to claim 8, characterized in that, In step S2, the flat cold plate is pre-cleaned with anhydrous alcohol to remove oil stains.

10. The manufacturing process of the irregularly shaped cold-rolled metal plate according to claim 8, characterized in that, In step S4, the welding pressure for stainless steel is 10-20 MPa, and the welding pressure for titanium alloy is 1-10 MPa, with a welding temperature of 700-800℃.

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