Manufacturing method for heat dissipation assembly, mold, and finished product of heat dissipation assembly

Abstract

A manufacturing method for a heat dissipation assembly (10), which method comprises the steps of: preparing a mold (30), the inside of the mold constituting a mold cavity (31) corresponding to the heat dissipation assembly; placing a substrate (11) into the mold cavity, uniformly mixing copper material particles (21) and aluminum material particles (22) to form mixed particles (A), and filling the remaining space of the mold cavity with the mixed particles; and inserting a pressurizing rotating shaft (40) into the mold cavity while rotating so as to achieve solid-state joint of the mixed particles and the substrate. Further provided are a mold for manufacturing the heat dissipation assembly and a heat dissipation assembly. By means of axial displacement of a pressurizing rotating shaft in the mold cavity and a high extrusion force generated by rotation, plastic deformation and lattice defects can be generated in the aluminum and copper particles, thereby reducing the interface binding energy and achieving mutual filling and diffusion, which achieves an integral formation effect of different materials of the heat dissipation assembly.

Description

Manufacturing method of heat dissipation component, mold and finished product thereof Technical Field

[0001] The present invention relates to the technical field of heat dissipation equipment, and in particular to a manufacturing method, a mold and a finished product of a heat dissipation component for electronic equipment. Background Art

[0002] With the advancement of technology and the widespread use of electronic devices, electronic device performance has become a major requirement for both the manufacturing industry and users. Consequently, the heat dissipation of these electronic devices during operation has also become a priority. Heat sink fins made of heat-dissipating metals with excellent thermal conductivity are commonly found in these electronic devices.

[0003] Heat sink fins are most commonly manufactured using extrusion, which involves pressing a heat sink metal at high temperatures until it forms the heat sink metal into the mold cavity. However, this method is limited to heat sink metals that are easily shaped, such as aluminum. Consequently, copper and copper alloys, commonly used in the manufacture of electronic components and precision micro-molds, are not suitable for this method due to their inherently difficult-to-process properties.

[0004] To produce the heat sink fins from copper metal, die casting is required. This involves heating and melting the heat sink metal, injecting it into a mold, and then cooling it to set the shape. However, this method is not only time-consuming but also extremely energy-intensive. Alternatively, forging can be used. However, when forming the heat sink base using forging, uneven plastic flow can easily cause height differences in the fins, requiring subsequent machining to achieve the desired product dimensions. Therefore, developing heat sink fins made from copper metal or copper alloys is a highly sought-after goal in the related industry.

[0005] Summary of the Invention

[0006] In order to develop a heat sink fin made of copper metal or copper alloy, the present invention provides a method for manufacturing a heat sink assembly, the steps of which include:

[0007] A mold is provided, wherein the mold cavity is formed with a mold opening on one side of the mold. The mold cavity includes a base portion and a central portion communicating between the base portion and the mold opening. The base portion has a radial extension that covers the central portion. A plurality of fin portions are radially concavely formed around a slot wall in a slot hole of the central portion.

[0008] placing a substrate in the substrate portion;

[0009] Evenly mixing copper material particles and aluminum material particles to form mixed particles, and placing the mixed particles into the mold cavity;

[0010] A pressure shaft is inserted into the mold cavity from the mold opening and rotates around the axis of the pressure shaft while the central portion is axially displaced.

[0011] The maximum distance between the pressurizing shaft and the central portion is less than the length of the central portion.

[0012] The thickness of each fin portion formed in a direction toward the mold opening decreases from the central portion toward the end of the fin portion.

[0013] The present invention also provides a mold for making a heat dissipation component, which has a mold cavity inside. The mold cavity forms a mold opening on one side of the mold. The mold cavity includes a substrate portion and a central portion connected between the substrate portion and the mold opening, and the radial extension range of the substrate portion covers the radial extension range of the central portion. A plurality of fin portions are radially recessed around the groove wall in the central portion slot.

[0014] The thickness of each fin portion formed in a direction toward the mold opening decreases from the central portion toward the end of the fin portion.

[0015] The present invention also provides a heat dissipation component made by the above method, which includes a substrate, a central column extending from one side of the substrate, and a plurality of heat dissipation fins arranged at intervals from a free end of the central column toward the substrate, and extending radially in a sheet-like manner around the surface of the central column.

[0016] Wherein, at least a portion of the substrate is made of copper metal or aluminum metal.

[0017] At least a portion of the substrate is made of the copper material particles, the aluminum material particles, or a mixture of the above materials.

[0018] Wherein, a joint interface is formed between the center column and the base plate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The heat dissipation assembly manufacturing method provided by the present invention utilizes only the high extrusion pressure generated by the axial displacement and rotation of the pressurized rotating shaft within the mold cavity to induce plastic deformation and lattice defects in the aluminum and copper particles, thereby reducing interfacial bonding energy and allowing for mutual diffusion and filling, thereby achieving the effect of integrally forming the heat dissipation assembly with different materials, overcoming the difficulty of processing and synthesizing copper and aluminum in traditional processes. Furthermore, the manufacturing method provided by the present invention is simple and reduces energy consumption. The copper and aluminum particles can also be made of recycled materials, facilitating material reuse and achieving environmentally friendly results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of a finished product of a preferred embodiment of the present invention;

[0022] FIG2 is a schematic diagram of a simulation of the manufacturing process of a preferred embodiment of the present invention;

[0023] FIG3 is a cross-sectional view of a finished product of a preferred embodiment of the present invention;

[0024] FIG4 is a cross-sectional view of a mold according to a preferred embodiment of the present invention.

[0025] Explanation of symbols: 10 heat dissipation component 11 substrate 12 center column 13 multiple heat dissipation fins 21 copper material particles 22 aluminum material particles 30 mold 31 mold cavity 311 substrate portion 312 center portion 313 fin portion 32 mold opening 40 pressurizing shaft A mixed particles B bonding interface H thickness distance DETAILED DESCRIPTION

[0026] Please refer to Figures 1 and 3, which are preferred embodiments of the heat dissipation assembly 10 provided by the present invention, comprising a base plate 11, a center column 12, and a plurality of heat dissipation fins 13. The base plate 11 is a plate, the center column 12 is a hollow column, and the center column 12 extends from one side of the base plate 11. The heat dissipation fins 13 are arranged at intervals from a free end of the center column 12 toward the base plate 11, and extend radially around the surface of the center column 12.

[0027] Next, please refer to Figure 2. The substrate 11, the center column 12 and the multiple heat dissipation fins 13 are made by mixing a copper material particle 21 and an aluminum material particle 22 and then forming them into one piece in a mold 30. A mold cavity 31 is formed in the mold 30, and the mold cavity 31 forms a mold opening 32 on one side of the mold 30. The mold cavity 31 corresponds to the shape of the heat dissipation component 10, and the inside of the mold cavity 31 toward the mold opening 32 includes a substrate portion 311, a central portion 312 and multiple fin portions 313 in sequence.

[0028] In the present invention, the term "copper material" refers to a material in which copper is the most abundant metal element. Preferably, the copper material particles are pure copper with a copper content of 90% or more. The term "aluminum material" refers to a material in which aluminum is the most abundant metal element. The term "particles" refers to particles having a maximum equivalent spherical diameter of less than 10 mm. These particles may be in the form of flakes, needles, strips, spheres, or any other irregular shape.

[0029] The aluminum material particles 22 may include recycled aluminum material; and the copper material particles 21 may also include recycled copper material.

[0030] The so-called "particles" in the present invention refer to particles with a maximum equivalent spherical diameter of less than or equal to 10 mm. The particles can be in the shape of flakes, needles, strips, spheres or any irregular shapes.

[0031] The central portion 312 is an elongated slot connecting the base portion 311 and the mold opening 32. The maximum aperture of the base portion 311 is larger than the maximum aperture of the central portion 312, and the extension of the base portion 311 completely covers the extension of the central portion 312. A plurality of fins 313 are radially recessed and formed around the slot wall of the central portion 312.

[0032] Please refer to Figure 4, in which a thickness distance H formed by each fin portion 313 toward the mold opening 32 is thinner from the central portion 312 toward the end of the fin portion 313, so that the cross-section of the fin portion 313 presents a triangular structure, which helps to improve the quality of the subsequent integrated molding of the heat dissipation component 10 during production.

[0033] The heat dissipation assembly 10 is manufactured by the following steps:

[0034] Step 1: Prepare the mold 30 and place the substrate 11 in the substrate portion 311 of the mold cavity 31. At this time, the substrate 11 is the completed plate, and the substrate 11 fills the substrate portion 311 after being placed.

[0035] At least a portion of the substrate 11 is made of the same material as at least a portion of the center column 12, which can be copper or aluminum. Alternatively, at least a portion of the substrate 11 can be made of the copper particles 21, the aluminum particles 22, or a mixture of these materials. In this embodiment, the substrate 11 is made of copper.

[0036] Step 2: The copper particles 21 and the aluminum particles 22 are uniformly mixed to form a mixed particle A, which is then placed into the mold cavity 31. The ratio of the copper particles 21 to the aluminum particles 22 is not limited and can be adjusted based on the operating environment, structural requirements, and other requirements of the heat dissipation component 10. A higher proportion of copper particles 21 can improve heat absorption and heat storage properties, exhibit antioxidant and corrosion resistance, and extend service life. A higher proportion of aluminum particles 22 can improve heat dissipation, reduce weight, and reduce costs.

[0037] Preferably, the mixed particles A can be placed into the mold cavity 31 through the mold opening 32. A material inlet communicating with the mold cavity 31 can also be provided in the mold 30.

[0038] Step 3: Solid-state bonding of the mixed particles A. A pressurizing shaft 40 is inserted into the mold cavity 31 through the mold opening 32 and simultaneously rotates about its axis while the central portion 312 is axially displaced. As the pressurizing shaft 40 axially displaces and rotates about the central portion 312, the mixed particles A are squeezed by the high pressure of the pressurizing shaft 40 and pushed into the gap between the pressurizing shaft 40 and the central portion 312 and into each of the fin portions 313.

[0039] It is worth noting that the mixed particles A are displaced by a high extrusion pressure, and in addition to being able to completely fill each of the fin portions 313, the lattice structures of the aluminum material particles 22 and the copper material particles 21 are destroyed due to the extrusion pressure, resulting in lattice gaps or lattice defects. At this time, the aluminum material particles 22 and the copper material particles 21 fill and diffuse with each other through the lattice gaps or lattice defects, so that part of the aluminum material particles 22 and the copper material particles 21 are compressed and bonded into a dense material due to the change in lattice structure, thereby achieving a solid-state bonding effect.

[0040] Step 4: Demolding to form the heat sink 10. After removing the mold 30, the mixed particles A fill the fin portion 313 and solid-state bond the mixed particles A to form the heat sink 13. The mixed particles A remaining in the gap between the pressurizing shaft 40 and the central portion 312 form the center column 12 after solid-state bonding.

[0041] It is worth noting that, due to the axial displacement of the pressurizing shaft 40 in the mold cavity 31 , the mixed particles A and the substrate 11 also have the above-mentioned solid bonding effect, so that a bonding interface B is formed between the center column 12 and the substrate 11 .

[0042] Furthermore, the maximum distance between the pressurizing shaft 40 and the central portion 312 is less than the length of the central portion 312, so that more of the mixed particles A can be retained for the solid-state bonding step with the substrate 11, so that a larger bonding interface B can be formed between the mixed particles A and the substrate 11.

[0043] In addition, when the thickness distance H of each fin portion 313 becomes thinner toward the end of the fin portion 313, in addition to facilitating the filling of the mixed particles A (from a large space to a small space), when the mixed particles A are filled into the end of the fin portion 313, the gradually shrinking space at the end of the fin portion 313 can also provide a resistance force to the mixed particles A, thereby helping to increase the material strength of the heat dissipation fins 13 of the heat dissipation component 10 after formation.

[0044] The heat dissipation assembly manufacturing method provided by the present invention utilizes only the high extrusion pressure generated by the axial displacement and rotation of the pressurized rotating shaft 40 within the mold cavity 31 to induce plastic deformation or lattice defects in the aluminum material particles 22 and the copper material particles 21, thereby reducing interfacial bonding energy and allowing for mutual diffusion and filling, thereby achieving the effect of integrally forming the heat dissipation assembly 10 with different materials, overcoming the difficulty of processing and synthesizing copper and aluminum materials in traditional processes. Furthermore, the manufacturing method provided by the present invention is simple and reduces energy consumption. The copper material particles 21 and the aluminum material particles 22 can also be made of recycled materials, facilitating material reuse and achieving environmentally friendly results.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a heat dissipation component, characterized in that: The steps include: A mold is provided, wherein a mold cavity is formed inside the mold cavity, a mold opening is formed on one side of the mold, the mold cavity includes a base plate portion, a central portion connected between the base plate portion and the mold opening, and the radial extension range of the base plate portion covers the radial extension range of the central portion, and a plurality of fin portions are radially concavely formed around the groove wall in the groove hole of the central portion; placing a substrate in the substrate portion; Evenly mixing a copper material particle and an aluminum material particle to form a mixed particle and placing the mixed particle into the mold cavity; A pressure shaft is inserted into the mold cavity from the mold opening and rotates around the axis of the pressure shaft while the central portion is axially displaced.

2. The method according to claim 1, characterized in that: The maximum distance between the pressurizing shaft and the central portion is smaller than the length of the central portion.

3. The method according to claim 1 or 2, characterized in that: A thickness of each fin portion formed in a direction toward the mold opening decreases from the central portion toward the end of the fin portion.

4. A mold for making a heat dissipation component, characterized in that: The interior of the mold cavity has a mold opening formed on one side of the mold. The mold cavity includes a substrate portion and a central portion connected between the substrate portion and the mold opening. The radial extension range of the substrate portion covers the radial extension range of the central portion. A plurality of fin portions are radially recessed around the groove wall in the central portion groove.

5. The mold according to claim 4, characterized in that A thickness of each fin portion formed in a direction toward the mold opening decreases from the central portion toward the end of the fin portion.

6. A heat dissipation component, characterized in that: The heat dissipation assembly includes a base plate, a central column extending from one side of the base plate, a plurality of heat dissipation fins arranged at intervals from a free end of the central column toward the base plate, and extending radially in a sheet shape around the surface of the central column, wherein The center column and the fin are formed as one piece by uniformly mixing the copper material particles and the aluminum material particles and extruding them; and A joint interface is formed between the center column and the base plate.

7. The heat dissipation assembly according to claim 6, characterized in that: At least a portion of the substrate is made of copper metal or aluminum metal.

8. The heat dissipation assembly according to claim 6, wherein: At least a part of the substrate is made of the copper material particles, the aluminum material particles or a mixture of the above materials.

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