Plastic forming process for hollow sheet type metal cooling fin module

Abstract

The invention relates to the technical field of cooling fins, and discloses a plastic molding process for a hollow sheet type metal cooling fin module. The plastic molding process comprises the following steps: S1, material selection: preparing high-temperature engineering plastic into a sheet-shaped plastic sheet I and a sheet-shaped plastic sheet II, preparing a metal sheet I and a metal sheet II by adopting aluminum or copper, the first plastic sheet and the second plastic sheet are formed through injection molding, the first metal sheet and the second metal sheet are formed through stamping, the third step of combination, the first metal sheet is embedded into the second plastic sheet, the second metal sheet is embedded into one face of the first plastic sheet, and then a combination sheet of the second plastic sheet and the first metal sheet is embedded into the other face of the first plastic sheet, the fourth step of detection and the fifth step of detection. According to the manufactured finished product, due to the fact that the heat-resisting plastic sheet and the heat-conducting sheet are stacked and formed, heat is limited in a local area, the metal sheet makes contact with the heat dissipation point of the hardware, and the situation that the metal sheet makes contact with other parts of the hardware, and consequently the non-heat-resisting area of the hardware is interfered by the overheated metal sheet and damaged is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of heat sinks, and specifically to a plastic molding process for a hollow thin - sheet metal heat sink module. Background Art

[0002] With the further increase in the integration of electronic products, the space between the internal hardware of electronic products has become narrower, which has a greater impact on the heat dissipation performance of the products. The narrow space between the hardware in the server cluster causes internal heat accumulation and poor heat dissipation.

[0003] For this reason, a plastic molding process for a hollow thin - sheet metal heat sink module is proposed. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a plastic molding process for a hollow thin - sheet metal heat sink module, which has advantages and solves problems.

[0005] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A plastic molding process for a hollow thin - sheet metal heat sink module, including the following steps:

[0006] S1. Material Selection

[0007] High - temperature engineering plastics such as PPS, PA66, LCP, etc. are used to make plastic sheet 1 and plastic sheet 2 in sheet form.

[0008] Aluminum and its alloys (low cost, light weight) or copper (better thermal conductivity) are used to make metal sheet 1 and metal sheet 2.

[0009] S2. Molding

[0010] Plastic sheet 1 and plastic sheet 2 are injection - molded, and the melt temperature is controlled at 260°C - 320°C. After injection molding, pressure holding is carried out to compensate for shrinkage and prevent sink marks.

[0011] Metal sheet 1 and metal sheet 2 are stamped into thin sheets, then carbon treatment is carried out. After that, one side of them is subjected to micro - etching or sandblasting treatment to increase the surface roughness, so as to have stronger adhesion when connecting with plastic sheet 1 and plastic sheet 2. When aluminum is selected, anodic oxidation is required to improve the corrosion resistance.

[0012] Then stress relief annealing is carried out on the plastic sheet and the metal sheet to eliminate the interfacial residual stress between the injection - molded sheet and the metal sheet.

[0013] S3. Assembly

[0014] Metal sheet 1 is buried in plastic sheet 2, metal sheet 2 is buried in one side of plastic sheet 1, and then the combined sheet of plastic sheet 2 and metal sheet 1 is buried in the other side of plastic sheet 1.

[0015] S4. Detection

[0016] The test is set up multiple times in the whole process, and the initial test is the thermal conductivity test (thermal resistance analysis) of the metal sheet after forming.

[0017] The secondary test is set after the assembly step to test the overall bonding strength of the heat sink (pull test).

[0018] Finally, an air tightness test is carried out (testing on hollow structures).

[0019] Preferably, the plastic sheet 1 is the main structure of the heat sink, and a front groove and a back groove are respectively provided on both sides thereof, which are used to accommodate the plastic sheet 2 and the metal sheet 2 respectively. After the plastic sheet 2 and the metal sheet 2 are connected to the plastic sheet 1, the front groove forms a cavity structure in the plastic sheet 1.

[0020] Preferably, two sides of the first plastic sheet are respectively provided with extension sections, and through holes are provided on the extension sections to communicate with the cavity structure.

[0021] Preferably, a heat strip 1 is provided on the plastic sheet 1, one side of which penetrates into the back groove and butts with the metal sheet 2, and the other side penetrates into the cavity. A heat strip 2 is provided on the plastic sheet 2, one side of which penetrates into the back groove and butts with the metal sheet 1, and the other side penetrates into the cavity.

[0022] Preferably, a plurality of contact fuses and contact fuses are correspondingly inserted into the plastic sheet 1 and the plastic sheet 2, and after the plastic sheet 2 is embedded in the plastic sheet 1, the contact fuses and contact fuses are respectively abutted one by one.

[0023] Compared with the prior art, the present invention provides a hollow thin-sheet metal heat sink module plastic molding process product, which has the following beneficial effects:

[0024] 1. Heat is limited to a local area by stacking a heat-resistant plastic sheet and a heat-conducting sheet. The metal sheet contacts the heat dissipation point of the hardware to avoid contact between the metal sheet and other parts of the hardware, which would cause the non-heat-resistant area of the hardware to be damaged by the interference of the overheated metal sheet.

[0025] 2. The depth of embedding the second plastic sheet into the first plastic sheet can be determined according to the size of the gap of the hardware to be cooled. By adjusting the embedding depth, the thickness of the finished product can be controlled so that the finished product can better fit the size of the hardware gap and achieve a stable cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the finished product structure of a hollow thin-sheet metal heat sink module plastic molding process of the present invention;

[0027] Figure 2Exploded view of the finished product structure of a plastic molding process for a hollow thin - sheet metal heat sink module of the present invention;

[0028] Figure 3 Schematic diagram of the main structure of the finished product of a plastic molding process for a hollow thin - sheet metal heat sink module of the present invention.

[0029] In the figure:

[0030] 1. Plastic sheet 1; 11. Positive groove; 12. Heat - connecting strip 1; 13. Fusing contact post 1; 14. Through - hole; 15. Gasket; 16. Back groove;

[0031] 2. Plastic sheet 2; 21. Sheet groove; 22. Heat - connecting strip 2; 23. Fusing contact post 2;

[0032] 3. Metal sheet 1;

[0033] 4. Metal sheet 2. Specific implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] As introduced in the background technology, there are deficiencies in the prior art. To solve the above - mentioned technical problems, the present application proposes a plastic molding process for a hollow thin - sheet metal heat sink module.

[0036] In a typical implementation mode of a plastic molding process for a hollow thin - sheet metal heat sink module of the present application, a plastic molding process for a hollow thin - sheet metal heat sink module includes the following steps:

[0037] S1. Material selection

[0038] Use high - temperature engineering plastics such as PPS, PA66, LCP, etc. to make sheet - shaped plastic sheet 1 and plastic sheet 2.

[0039] Use aluminum and its alloys (low cost, light weight) or copper (better thermal conductivity) to make metal sheet 1 and metal sheet 2.

[0040] S2. Molding

[0041] Plastic sheet 1 and plastic sheet 2 are injection - molded, and the melt temperature is controlled at 260°C - 320°C. After injection molding, pressure holding is carried out to compensate for shrinkage and prevent sink marks.

[0042] The first metal sheet 3 and the second metal sheet 4 are formed by stamping into thin sheets, then carbon treatment is carried out, and then one side of them is subjected to micro-etching or sandblasting to increase the surface roughness, so as to have stronger adhesion when connecting with the first plastic sheet 1 and the second plastic sheet 2. When selecting aluminum, anodic oxidation is required to improve the corrosion resistance.

[0043] After that, stress relief annealing is carried out on the plastic sheet and the metal sheet to eliminate the interfacial residual stress between the injection molded sheet and the metal sheet.

[0044] S3. Assembly

[0045] The first metal sheet 3 is embedded in the second plastic sheet 2, and the second metal sheet 4 is embedded in one side of the first plastic sheet 1, and then the combined sheet of the second plastic sheet 2 and the first metal sheet 3 is embedded in the other side of the first plastic sheet 1.

[0046] S4. Detection

[0047] The detection is set multiple times in the whole process. The preliminary detection is the thermal conductivity test (thermal resistance analysis) after the metal sheet is formed.

[0048] The secondary detection is set after the assembly step to test the overall bonding strength of the heat sink (pull-out test).

[0049] Finally, airtightness detection is carried out (testing for the hollow structure).

[0050] Specifically, refer to Figures 1 to 3 As shown, the first plastic sheet 1 is the structural main body, and positive grooves 11 and back grooves 16 are respectively opened on its two sides for accommodating the second plastic sheet 2 and the second metal sheet 4. A gasket 15 is arranged around the inner edge of the positive groove 11 to prevent the second plastic sheet 2 from being completely embedded in the positive groove 11. After the second metal sheet 4 is attached to the back groove 16, the unfilled positive groove 11 forms a cavity structure inside the first plastic sheet 1. Extension segments are arranged outward on both sides of the first plastic sheet 1, and through holes 14 communicating with the positive groove 11 are opened on the extension segments. After the cavity is formed inside the first plastic sheet 1, the positive grooves 11 on both sides communicate with the cavity.

[0051] A sheet groove 21 for accommodating the first metal sheet 3 is opened on the surface of the second plastic sheet 2. A heat receiving strip one 12 is arranged in the back groove 16. After the first metal sheet 3 is attached to the back groove 16, it is docked with the heat receiving strip one 12. A heat receiving strip two 22 is arranged in the sheet groove 21. After the first metal sheet 3 is attached to the sheet groove 21, it is docked with the heat receiving strip two 22. The heat receiving strip one 12 penetrates through the back groove 16 and invades the positive groove 11. The heat receiving strip two 22 is embedded in the second plastic sheet 2 and protrudes from the joint surface of the second plastic sheet 2 and the first plastic sheet 1, so that after the second plastic sheet 2 is embedded in the positive groove 11, the heat receiving strip two 22 invades the cavity.

[0052] A number of melting contact posts 13 and 23 are inserted into the mating surfaces of the plastic sheet 1 and the plastic sheet 2. After the plastic sheet 2 is inserted into the plastic sheet 1, the melting contact posts 13 and 23 are respectively in contact with each other one by one. By means of ultrasonic hot melting, the melting contact posts 13 and the heat receiving strip 12 can be heated. After cooling, the melting contact posts 13 and 23 are condensed and fixed, stably connecting the plastic sheet 1 and the plastic sheet 2 to form an integral structure.

[0053] After the heat sink is formed, it is inserted into the hardware part that needs to be cooled through the inserted gap. The metal sheets 3 and 4 on both sides are respectively attached to the hardware on both sides to achieve the heat conduction effect. Since through holes 14 are provided on both sides of the cavity formed inside the plastic sheet 1, the heat accumulated in the cavity is discharged directionally by connecting fluid air flow or water flow. Due to the provision of the heat receiving strip 12 and the heat receiving strip 22, the heat exchange efficiency between the metal sheet and the cavity is increased, so that the circulation of the fluid can further increase the discharge effect of the heat accumulated in the cavity.

[0054] The device is formed by stacking heat-resistant plastic sheets and metal sheets. While limiting the heat in a local space, it avoids the situation where the metal sheet contacts the non-heat-conducting area of the hardware, and prevents the metal sheet from being heated to too high a temperature during the heat conduction process and contacting the non-heat-resistant part of the hardware, resulting in damage to this area.

[0055] The melting contact posts 13 and 23 are connected to the plastic sheet 1 and the plastic sheet 2 by insertion. By controlling the insertion depth, the depth of the plastic sheet 2 inserted into the plastic sheet 1 is adjusted to control the thickness of the formed heat sink, so as to ensure that the thickness of the heat sink can be stably inserted into the gap of the hardware that needs to be cooled and stably connected thereto. Then, the hot melting of the melting contact posts 13 and 23 ensures the stability of the formed shape.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic molding process for a hollow sheet-type metal heat sink module, characterized in that: It includes the following steps: S1. Material selection Use high-temperature engineering plastics such as PPS, PA66, LCP, etc. to make sheet-shaped plastic sheet one (1) and plastic sheet two (2). Use aluminum and its alloys (low cost, light weight) or copper (better thermal conductivity) to make metal sheet one (3) and metal sheet two (4). S2. Molding Plastic sheet one (1) and plastic sheet two (2) are injection molded, and the melt temperature is controlled at 260°C to 320°C. After injection molding, pressure holding is carried out to compensate for shrinkage and prevent sink marks. Metal sheet one (3) and metal sheet two (4) are stamping formed into thin sheets, then carbon treatment is carried out, and then one side of them is subjected to micro-etching or sandblasting treatment to increase the surface roughness and have stronger bonding force when connected to plastic sheet one (1) and plastic sheet two (2). When selecting aluminum, anodic oxidation is required to improve the corrosion resistance. Then stress relief annealing is carried out on the plastic sheet and the metal sheet to eliminate the interfacial residual stress of the injection molded sheet and the metal sheet. S3. Assembly Metal sheet one (3) is buried in plastic sheet two (2), metal sheet two (4) is buried in one side of plastic sheet one (1), and then the combined sheet of plastic sheet two (2) and metal sheet one (3) is buried in the other side of plastic sheet one (1). S4. Detection Detection is set multiple times in the whole process. The preliminary detection is the thermal conductivity test (thermal resistance analysis) after the metal sheet is formed. The secondary detection is set after the assembly step to test the overall bonding strength of the heat sink (pull-out test). Finally, airtightness detection is carried out (testing for the hollow structure).

2. A hollow thin - sheet metal heat sink adopts the plastic molding process of a hollow thin - sheet metal heat sink module described in claim 1, and is characterized in that: The plastic sheet one (1) is the main structure of the heat sink, and a front groove (11) and a back groove (16) are respectively opened on its two sides, which are respectively used to accommodate the plastic sheet two (2) and the metal sheet two (4). After the plastic sheet two (2) and the metal sheet two (4) are connected to the plastic sheet one (1), the front groove (11) forms a cavity structure in the plastic sheet one (1).

3. The hollow thin-sheet metal heat sink according to claim 2, characterized in that: Extension segments are respectively arranged on both sides of the plastic sheet one (1), and through holes (14) are opened on the extension segments and communicated with the cavity structure.

4. The hollow sheet metal heat sink according to claim 3, characterized in that: A heat receiving strip one (12) is arranged on the plastic sheet one (1). One side of the heat receiving strip one (12) intrudes into the back groove (16) to dock with the metal sheet two (4), and the other side intrudes into the cavity. A heat receiving strip two (22) is arranged on the plastic sheet two (2). One side of the heat receiving strip two (22) docks with the metal sheet one (3). The other side intrudes into the cavity.

5. The hollow thin-sheet metal heat sink according to claim 2, characterized in that: A number of melting contact columns (13) and melting contact columns (23) are respectively inserted into the plastic sheet one (1) and the plastic sheet two (2). After the plastic sheet two (2) is embedded in the plastic sheet one (1), the melting contact columns (13) and the melting contact columns (23) are respectively in one-to-one contact.

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