Method for producing a cold plate with an intermediate layer

Abstract

The application discloses a cold plate production method with an intermediate layer, comprising single-piece punch forming of an upper plate and a lower plate, and inlet and outlet water port processing; the upper and lower plate materials are selected from 5 series aluminum alloys with good strength and welding performance, such as 5754, 5083, 5182 and the like; a tool is used to fix the intermediate layer on a flat plate; point gluing fixation or lashing or spraying can be used to combine the intermediate layer with the flat plate; the intermediate layer is made of 4 series aluminum alloys, such as 4045 and 4047, and the thickness is between 0.1 mm and 0.2 mm; the lower plate is assembled above the intermediate layer; laser welding is performed along the track of the intermediate layer; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate; in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding penetration depth is greater than or equal to 0.25 mm, and the welding width is greater than or equal to 1.2 mm; the application has the advantages of simple process, reduced production cost, reduced flatness requirement between the flat plate and the stamping plate after adding the intermediate layer, reduced processing difficulty and improved product yield.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water-cooled plates, and more particularly relates to a production method of a cold plate with an intermediate layer. BACKGROUND

[0002] A cold plate is a common heat dissipation device used to absorb and dissipate heat generated in high-temperature equipment or processes. It is usually made of metal materials such as copper, aluminum or stainless steel, and has good heat conduction performance and corrosion resistance. The working principle of a water-cooled plate is to absorb the heat of high-temperature components or media through flowing cooling water and carry it away. It is widely used in industrial and electronic fields, such as power equipment, laser equipment, welding equipment, etc. And the cold plate needs to be punched during production.

[0003] The raw material needs to be compounded with brazing filler metal, and the brazing filler metal needs to be coated with flux during brazing. After production, the overflowed brazing filler metal and flux need to be treated; the process is responsible, the cost is high, and it has a certain pollution. SUMMARY

[0004] The purpose of the application is to solve the problems in the prior art and provide a production method of a cold plate with an intermediate layer.

[0005] To achieve the above purpose, the application provides the following technical scheme:

[0006] A production method of a cold plate with an intermediate layer, comprising the following steps:

[0007] S1, the upper plate and the lower plate are single-piece stamped and formed, and the water inlet and outlet are processed and formed; the materials of the upper plate and the lower plate are selected from 5-series aluminum alloys with good strength and welding performance; in the S1, the materials of the upper plate and the lower plate are selected from 5-series aluminum alloys with good strength and welding performance, and the materials with specified thickness and size are selected according to design requirements; after the selection, the selected upper and lower plate materials are subjected to stamping processing, and the plate materials are installed on the punch; the die is designed: the punch dies of the upper plate and the lower plate are manufactured according to the product design requirements; the punch dies can be manufactured by cutting, casting and electric spark machining; the workpiece is positioned and clamped: the metal plate to be processed is placed in the punch die working area, and the clamp is used for positioning and fixing, to ensure that the workpiece is fixed firmly to prevent displacement during stamping; stamping operation: the stamping operation usually includes the following steps:

[0008] Down: the punch presses the upper plate to the surface of the workpiece by hydraulic pressure, so that the workpiece is subjected to pressure; down: the upper plate is lowered to the set depth, so that the upper plate is in contact with the lower plate and the workpiece is pressed into the die; impact: the punch applies impact force through punch, die cavity and other components, so that the upper plate exerts impact on the workpiece, which will force the metal sheet to plastically deform and gradually form the required shape; lift: the upper plate is lifted to separate it from the lower plate, and the formed workpiece is taken out of the die; finally, inspection and adjustment: after the stamping process is completed, the upper and lower plate materials are inspected to ensure that the size and shape meet the design requirements;

[0009] S2, the intermediate layer is fixed on the flat plate by using a tool; it can be fixed by dispensing or by lashing or spraying to be combined with the flat plate, the intermediate layer is made of 4 series aluminum alloy, and the thickness is between 0.1mm-0.2mm; in the S2, when the intermediate layer is fixed on the flat plate, the intermediate layer can be applied on the surface of the cold plate by coating, and the 4 series aluminum alloy is added in the middle to form a sandwich structure, and then welded by laser, and the gap between the upper and lower plates is filled by the capillary action of the 4 series aluminum alloy in the middle layer, forming a stable welded structure of three layers; due to the existence of the intermediate layer, the interlayer gap can be reliably and stably welded under the condition of ≤0.25mm;

[0010] S3, the lower plate is assembled above the intermediate layer;

[0011] S4, laser welding is performed along the intermediate layer track by using laser; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate, in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding depth is ≥0.25mm, and the width is ≥1.2mm; the thickness of the lower plate is ≥0.8mm;

[0012] S5, assemble the inlet and outlet water nozzle;

[0013] S6, welding the inlet and outlet water nozzle by laser;

[0014] S7, product line testing.

[0015] Preferably, in the S3, when the lower plate is assembled above the intermediate layer, the positioning assembly is used to position the lower plate and the intermediate layer during installation, so as to improve the accuracy and efficiency of installing the lower plate to the intermediate layer.

[0016] Preferably, when the upper plate and the lower plate in S4 are welded, the welded upper plate and the lower plate need to be clamped and fixed by clamping the workpiece, so as to improve the quality and accuracy during welding, so as to ensure the integrity and stability of the structure, and also includes welding the water channel pipe and connecting the inlet and outlet pipes, and when the laser welding method is used, the composite brazing raw material is not needed, and the 5 series aluminum alloy material with better performance is selected; the brazing water cooling plate needs to be coated with a brazing agent: the laser welding does not need this process, which can save cost and reduce pollution.

[0017] Preferably, the inlet and outlet water nozzle in S5 is welded and assembled by a laser welding method during assembly, so as to improve the stability of the inlet and outlet water nozzle during use.

[0018] Preferably, the product offline test in S7 is performed by testing and debugging the cold plate formed by the processing through the product test equipment, so as to ensure the normal operation and heat dissipation effect of the cold plate, and the test also includes:

[0019] Leakage test: the leakage test is performed before the cold plate is assembled to ensure the sealing performance, and the leakage agent is applied on the cold plate to observe whether there is leakage.

[0020] Technical effects and advantages of the present application: the cold plate production method with an intermediate layer provided by the present application has the following advantages compared with the prior art,

[0021] The present application has simple process and low production cost, and after adding the intermediate layer, the flatness requirement between the flat plate and the punched plate can be reduced, the processing difficulty is reduced, and the product yield is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 The cold plate production flowchart of the present application is shown in the figure;

[0023] Fig. 2 The cold plate forming schematic diagram of the present application is shown in the figure;

[0024] Fig. 3 The cold plate cross-sectional schematic diagram of the present application is shown in the figure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Embodiment 1, as Figs. 1-3 ,

[0027] The application discloses a cold plate production method with an intermediate layer, and comprises the following steps:

[0028] S1, the upper plate and the lower plate are formed by single piece stamping, and the water inlet and outlet are processed and formed; the materials of the upper plate and the lower plate are selected from 5 series aluminum alloys with good strength and welding performance, such as 5754, 5083 and 5182;

[0029] S2, the intermediate layer is fixed on the flat plate by using a tool; the intermediate layer can be fixed by using point gluing or be combined with the flat plate by using lashing or spraying, the intermediate layer is made of 4 series aluminum alloys, such as 4045 and 4047, and the thickness of the intermediate layer is between 0.1 mm and 0.2 mm;

[0030] S3, the lower plate is assembled above the intermediate layer;

[0031] S4, laser welding is performed along the track of the intermediate layer by using a laser; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate, in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding depth is greater than or equal to 0.25 mm, the laser welding width is greater than or equal to 1.2 mm, and the thickness of the lower plate is greater than or equal to 0.8 mm;

[0032] S5, the inlet and outlet water nozzles (water inlet, water outlet and laser welding area of the water inlet and outlet) are assembled;

[0033] S6, the inlet and outlet water nozzles are welded by using a laser;

[0034] S7, product offline testing.

[0035] In S1, the materials of the upper plate and the lower plate are selected from 5 series aluminum alloys with good strength and welding performance, such as 5754, 5083 and 5182, the materials with appropriate thickness and size are selected according to design requirements, the selected upper and lower plate materials are subjected to stamping processing, and the plate materials are installed on a punch or a die machine; a die is designed: the dies for the upper plate and the lower plate are manufactured according to product design requirements, and the dies can be manufactured by cutting, casting or electric spark machining; a workpiece is positioned and clamped: the metal plate to be processed is placed in the die working area, and is positioned and fixed by using a clamp or a chuck, so that the workpiece is fixed firmly to prevent displacement in the stamping process; stamping operation: the stamping operation usually comprises the following steps:

[0036] Down: the upper plate is pressed down to the surface of the workpiece by the hydraulic or mechanical pressure of the punch or die machine, so that the workpiece is subjected to pressure; down: the upper plate is lowered to the set depth, so that it is in contact with the lower plate and the workpiece is pressed into the die; impact: the punch or die machine applies impact force through the punch, die cavity and other components, so that the upper plate exerts impact or pressure on the workpiece, which will force the sheet metal to plastically deform and gradually form the desired shape; lift: the upper plate is lifted so that it is separated from the lower plate, and the shaped workpiece is taken out of the die; finally, through inspection and adjustment: after the stamping process is completed, the upper and lower sheet materials are inspected to ensure that their size, shape, etc. meet the design requirements.

[0037] In S2, when the intermediate layer is fixed on the flat plate, the intermediate layer material is coated on the inner side or outer side of the cold plate by spraying. The intermediate layer often uses materials such as silica gel or polyurethane with good high-temperature resistance or heat insulation performance. The intermediate layer can be applied on the surface of the cold plate by coating, rolling or spraying, etc. The 4-series aluminum alloy is added in the middle to form a sandwich structure, and then laser welding is used. The capillary action of the 4-series aluminum alloy in the middle layer fills the gap between the upper and lower plates, forming a stable welded structure of three layers fused together. Due to the presence of the intermediate layer, the interlayer gap can be reliably and stably welded under the condition of ≤0.25mm.

[0038] In S3, when the lower plate is assembled above the intermediate layer, the positioning assembly is used to position the lower plate and the intermediate layer during installation, so as to improve the accuracy and efficiency of the installation of the lower plate to the intermediate layer.

[0039] In S4, when the lower plate is welded to the plate, the upper and lower plates to be welded are clamped and fixed by clamping the workpiece, so as to improve the quality and accuracy during welding, which can ensure the integrity and stability of the structure. At the same time, it also includes welding water channel pipes, connecting import and export pipes, etc. When using laser welding method, it does not need to use composite brazing raw materials, and can choose 5-series aluminum alloy materials with better performance; brazing water cooling plate needs to be coated with brazing flux: laser welding does not need this process, which can save cost and reduce pollution.

[0040] In S5, the import and export water nozzle can be welded during assembly to improve the stability of the import and export water nozzle during use.

[0041] In S7, the product is tested after being processed into a cold plate, and the cold plate is tested and debugged by the product test equipment to ensure the normal operation and heat dissipation effect of the cold plate. The test also includes:

[0042] Water leakage test: before assembling the water cooling plate, perform a water leakage test to ensure its sealing performance. You can apply a water leakage agent or inject pressure to observe whether there is any leakage.

[0043] It should be pointed out finally that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced equivalently, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of producing a cold plate having an intermediate layer, characterized by: It comprises the following steps: S1, the upper plate and the lower plate are single-piece stamping formed, and the water inlet and outlet are processed and formed; the material of the upper plate and the lower plate is selected from 5 series aluminum alloy with good strength and welding performance; in S1, the material of the upper plate and the lower plate is selected from 5 series aluminum alloy with good strength and welding performance, the material with specified thickness and size is selected according to the design requirements, after the selection, the selected upper and lower plate materials are subjected to stamping processing, and the plate materials are installed on the punch; the die is designed: the punch dies of the upper plate and the lower plate are manufactured according to the product design requirements, and the punch dies can be manufactured by cutting, casting and electric spark machining; the workpiece is positioned and clamped: the metal plate to be processed is placed in the working area of the punch die, and the clamp is used for positioning and fixing, so as to ensure that the workpiece is fixed firmly to prevent displacement during stamping; the stamping operation usually comprises the following steps: Downward pressing: the punch presses the upper plate to the surface of the workpiece by hydraulic pressure, so that the workpiece is subjected to pressure; Lowering: the upper plate is lowered to a set depth, so that the upper plate contacts the lower plate and the workpiece is pressed into the punch die; impact: the punch applies impact force through punch, die cavity and other components, so that the upper plate exerts impact on the workpiece, which forces the metal plate to plastically deform and gradually form the required shape; Lifting: the upper plate is lifted to separate it from the lower plate, and the formed workpiece is taken out of the punch die; finally, the formed upper and lower plate materials are inspected to ensure that the size and shape meet the design requirements after the stamping process is completed; S2, the intermediate layer is fixed on the flat plate by using a tool; it can be fixed by point gluing or combined with the flat plate by lashing or spraying, and the intermediate layer is made of 4 series aluminum alloy with a thickness of 0.1-0.2mm; in S2, when the intermediate layer is fixed on the flat plate, the intermediate layer can be applied on the surface of the cold plate by coating, and a sandwich structure is made by adding 4 series aluminum alloy in the middle, then welded by laser, and the gap between the upper and lower plate materials is filled by the capillary action of the 4 series aluminum alloy in the middle layer, forming a stable welded structure of three layers; due to the existence of the intermediate layer, the interlayer gap can be reliably and stably welded under the condition of ≤0.25mm; S3, the lower plate is assembled above the intermediate layer; S4, laser welding is performed along the intermediate layer track; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate, in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding depth is ≥0.25mm, and the welding width is ≥1.2mm; the thickness of the lower plate is ≥0.8mm; S5, assemble the inlet and outlet water nozzle; S6, weld the inlet and outlet water nozzle by laser; S7, product line testing.

2. The method of claim 1, wherein: In S3, when the lower plate is assembled above the intermediate layer, the positioning assembly is used to position the lower plate and the intermediate layer during installation, so as to improve the accuracy and efficiency of installing the lower plate to the intermediate layer.

3. The method of claim 1, wherein: The upper plate and the lower plate in the S4 are welded, and the welded upper plate and the lower plate are clamped and fixed by clamping the workpiece, so as to improve the quality and accuracy during welding, thereby ensuring the integrity and stability of the structure, and also including the welding of the water channel pipe and the connection of the inlet and outlet pipes, and when the laser welding method is used, the composite brazing raw material is not needed, and a 5-series aluminum alloy material with better performance is selected; the brazing water cooling plate needs to be coated with a brazing agent: the laser welding does not need this process, which can save costs and reduce pollution.

4. The method of claim 1, wherein: The inlet and outlet water nozzles in the S5 are assembled by laser welding, which improves the stability of the inlet and outlet water nozzles during use.

5. The method of claim 1, wherein: The S7 product is tested offline, and the molded cold plate is tested and debugged by the product testing equipment to ensure the normal operation and heat dissipation effect of the cold plate, and the test also includes: Water leakage test: before assembling the cold plate, the water leakage test is carried out to ensure the sealing performance, and the water leakage agent is applied on the cold plate to observe whether there is water leakage.

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