Method for manufacturing heat radiating member, mold and product thereof

Abstract

To provide a manufacturing method of a heat dissipation member, a metal mold, and a product of the same.SOLUTION: A step of a manufacturing method of a heat dissipation member, is of: preparing a metal mold constructing a metal mold cavity of which an internal part corresponds to the heat dissipation member; distributing a substrate to the metal mold cavity; forming a mixed particle by uniformly mixing a copper material particle and an aluminum material particle; and filling the residual space of the metal mold cavity. A compression rotational shaft is inserted into the metal mold cavity and moves, and at the same time, bonds the mixed particle with the substrate in a solid phase.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a heat dissipation member for an electric device.

Background Art

[0002] With the progress of science and technology and the popularization of electronic devices, the working efficiency of electronic devices has become one of the main requirements pursued by related manufacturing industries and users. The heat dissipation effect during the operation of the electronic device is also emphasized, and heat dissipation fins made of a heat dissipation metal with good thermal conductivity are often seen in the electronic device.

[0003] The heat dissipation fin is generally made by extrusion molding in which a heat dissipation metal is extruded at a high temperature and the heat dissipation metal is formed corresponding to the cavity of a mold. However, since this method is limited in application to heat dissipation metals (such as aluminum metals) that are easy to form, copper metals and copper alloys that are often used in the manufacture of electronic members and precision micromold members are not suitable for manufacture by this method due to their difficult-to-process material characteristics.

[0004] When making a heat dissipation fin of a copper metal material, a die casting method in which the heat dissipation metal is heated and melted, injected into a mold, and cooled to form is required. However, this method not only takes time but also consumes a great deal of energy. Or a forging method is used, but when forming a heat dissipation member of a fin by the forging method, a height difference is likely to occur in the height of the fin due to non-uniform plastic flow, and subsequent finishing of the appearance dimensions of the product by more machining is required. Therefore, the development of heat dissipation fins made of copper metal or copper alloy has become a development goal for the related industry.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In order to develop a heat dissipation fin made of copper metal or copper alloy, the present invention provides a method for manufacturing a heat dissipation member, a mold, and its product.

Means for Solving the Problems

[0006] The manufacturing method of the heat dissipation member provided by the present invention includes the steps of preparing a mold with a mold cavity formed inside, wherein the mold cavity has a mold opening formed on one side surface of the mold. The mold cavity includes a substrate portion, a central portion communicating between the substrate portion and the mold opening, and a plurality of fin portions formed by being recessed radially around the groove walls in the groove of the central portion. The radial extension range of the substrate portion covers the radial extension range of the central portion. The step of disposing a substrate within the substrate portion. Copper The step of uniformly mixing material particles and aluminum material particles to form mixed particles and disposing them within the mold cavity. The step of inserting a pressure rotating shaft into the mold cavity from the mold opening and rotating the axis of the pressure rotating shaft while moving axially within the central portion. The step of removing the mold to form a heat dissipation member. including.

[0007] In the manufacturing method of the heat dissipation member of the present invention, the maximum distance at which the pressure rotating shaft is inserted into the central portion is smaller than the length of the central portion.

[0008] In the manufacturing method of the heat dissipation member of the present invention, the thickness distance of each fin portion configured in the direction of the mold opening becomes thinner toward the end of the fin portion in the central portion.

[0009] The present invention further provides a mold for manufacturing a heat dissipation member, with a mold cavity formed inside. The mold cavity has a mold opening formed on one side surface of the mold. The cavity includes a substrate portion, a central portion communicating between the substrate portion and the mold opening, and a plurality of fin portions formed by being recessed radially around the groove walls in the groove of the central portion. The radial extension range of the substrate portion covers the radial extension range of the central portion.

[0010] In the mold of the present invention, the thickness distance formed in the mold opening direction of each of the fin portions becomes thinner toward the end of the fin portion at the central portion.

[0011] The present invention further provides a heat dissipation member manufactured by the above method, the heat dissipation member including a substrate, a center pillar extending and protruding from one side surface of the substrate, and a plurality of fins arranged at intervals from the free end of the center pillar toward the substrate and extending in a sheet shape in the radial direction so as to surround the surface of the center pillar.

[0012] In the heat dissipation member of the present invention, at least a part of the material of the substrate is copper metal or aluminum metal.

[0013] In the heat dissipation member of the present invention, at least a part of the material of the substrate is the copper material particles, the aluminum material particles, or a mixture of the materials.

[0014] In the heat dissipation member of the present invention, a bonding surface is formed between the center pillar and the substrate.

Effects of the Invention

[0015] The manufacturing method of the heat dissipation element provided by the present invention causes the plastic deformation and crystal lattice defects to be formed in the aluminum material particles and the copper material particles only by the axial movement of the pressurized rotating shaft in the mold cavity and the generation of high friction and extrusion force in advance, reduces the interfacial bonding energy, fills and diffuses with each other, achieves the effect of bonding and forming different materials of the heat dissipation member, and overcomes the problem that it is difficult to process and synthesize copper and aluminum materials in the conventional process. Further, the manufacturing method provided by the present invention has simple steps, reduced energy consumption, and the copper material particles and the aluminum material particles can further select recycled materials, can reuse materials, and obtains an environmentally friendly effect.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying out the Invention

[0017] Referring to FIGS. 1 and 3, a preferred embodiment of the heat dissipation member 10 provided by the present invention includes a substrate 11, a center pillar 12, and a plurality of heat dissipation fins 13. The substrate 11 is a plate material, the center pillar 12 is a hollow columnar shape, and the center pillar 12 extends and protrudes from one side surface of the substrate 11. Each of the heat dissipation fins 13 is arranged at intervals from the free end of the center pillar 12 toward the substrate 11, and extends in a sheet shape in the radial direction so as to surround the surface of the center pillar 12.

[0018] Next, referring to FIG. 2, the substrate 11, the center pillar 12, and the plurality of heat dissipation fins 13 are formed by mixing copper material particles 21 and aluminum material particles 22 and then molding them in a mold 30. A mold cavity 31 is formed in the mold 30. The mold cavity 31 forms a mold opening 32 on one side surface of the mold 30. The mold cavity 31 is molded corresponding to the heat dissipation member 10. The inside of the mold cavity 31 includes a substrate portion 311, a central portion 312, and a plurality of fin portions 313 in order toward the mold opening 32.

[0019] Here, the so-called "copper material" refers to, in the present invention, a material in which the metal element with the highest content is copper. Preferably, the copper material particles are pure copper with a copper content of 90% or more. The so-called "aluminum material" refers to, in the present invention, a material in which the metal element with the highest content is aluminum. The so-called "particles" refer to, in the present invention, particles with an equivalent maximum spherical diameter of less than 10 mm, and the particles may be in the shape of a sheet, needle, strip, sphere, or any irregular shape.

[0020] The aluminum material particles 22 may include recycled aluminum materials, and the copper material particles 21 may also include recycled copper materials.

[0021] Here, the so-called "particles" refer to, in the present invention, particles with an equivalent maximum spherical diameter of 10 mm or less, and the particles may be in the shape of a sheet piece, needle, strip, sphere, or any irregular shape.

[0022] Here, in the central portion 312, a long groove communicates between the substrate portion 311 and the mold opening 32, the maximum hole diameter formed in the substrate portion 311 is larger than the maximum hole diameter formed in the central portion 312, and the extension range of the substrate portion 311 covers the extension range of the central portion 312. The plurality of fin portions 313 are formed by being recessed radially so as to surround the groove walls in the groove of the central portion 312.

[0023] Referring to FIG. 4, the thickness distance H formed in the direction of the mold opening 32 of each fin portion 313 becomes thinner toward the end of the fin portion 313 in the central portion 312, and the cross section of the fin portion 313 has a triangular structure, which contributes to the quality of bonding and forming during the manufacture of the subsequent heat dissipation member 10.

[0024] The manufacturing steps of the heat dissipation member 10 include the following. Step 1: Prepare the mold 30, place the substrate in the substrate portion 311 of the mold cavity 31. At this time, the substrate 11 is the plate material that has completed manufacturing, and after being placed, the substrate 11 fills the substrate portion 311.

[0025] Here, at least a part of the material of the substrate 11 is the same as at least a part of the material of the center pillar 12, and may be copper metal or aluminum metal. Alternatively, at least a part of the material of the substrate 11 is the copper material particles 21, and is formed by the aluminum material particles 22 or a mixture of the materials. In the present embodiment, the substrate 11 is formed of the copper metal.

[0026] Step 2: After the copper material particles 21 and the aluminum material particles 22 are uniformly mixed, mixed particles A are formed and placed in the mold cavity 31. Here, the ratio of the copper material particles 21 and the aluminum material particles 22 is not limited, and can be adjusted according to the requirements of the use environment, structural form, etc. of the heat dissipation member 10. When the ratio of the copper material particles 21 is large, the heat dissipation member 10 is provided with good heat absorption characteristics and heat resistance characteristics, shows antioxidant and corrosion resistance characteristics, and can extend the service life. When the ratio of the aluminum material particles 22 is large, the heat dissipation member 10 can be provided with rapid heat dissipation, weight reduction and cost reduction effects.

[0027] Preferably, the mixed particles A can be placed in the mold cavity 31 through the mold opening 32. The mold 30 may be provided with a supply port communicating with the mold cavity 31.

[0028] Step 3: Solid-phase bond the mixed particles A. The pressure rotating shaft 40 is inserted into the mold cavity 31 through the mold opening 32, and moves axially in the central portion 312 while rotating the axis of the pressure rotating shaft 40. When the pressure rotating shaft 40 rotates while moving axially in the central portion 312, the mixed particles A are pushed to the gap between the central portion 312 of the pressure rotating shaft 40 and each fin portion 313 under the high friction and pushing force of the pressure rotating shaft 40.

[0029] In addition, the mixed particles A are displaced by high friction and extrusion force to completely fill each fin portion 313. When the crystal lattice structures of the aluminum material particles 22 and the copper material particles 21 are also damaged by the friction and extrusion force to generate crystal lattice spacing or crystal lattice defects, the aluminum material particles 22 and the copper material particles 21 fill and diffuse into each other through the crystal lattice gaps or crystal lattice defects, and a part of the aluminum material particles 22 and the copper material particles 21 are compression-bonded into a dense material due to the change in the crystal lattice structure, thereby obtaining a solid-phase bonding effect.

[0030] Step 4: Demold to form the heat dissipation member 10. After removing the mold 30, the mixed particles A are filled in the region of the fin portion 313 and solid-phase bonded to form the heat dissipation fins 13, and the mixed particles A remaining in the gap between the pressurized rotating shaft 40 and the central portion 312 form the center pillar 12 after solid-phase bonding.

[0031] Note that the pressurized rotating shaft 40 has the above-described solid-phase bonding effect between the mixed particles A and the substrate 11 by being displaced axially within the mold cavity 31, and a bonding surface B is formed between the center pillar 12 and the substrate 11.

[0032] Furthermore, the maximum distance between the pressurized rotating shaft 40 and the central portion 312 is smaller than the length of the central portion 312, so that more of the mixed particles A can be left for the solid-phase bonding step with the substrate 11, and a bonding surface B with a larger area can be formed between the mixed particles A and the substrate 11.

[0033] In addition, when the thickness distance H of each fin portion 313 becomes thinner toward the end of the fin portion 313, it is not only easy for the mixed particles A to be filled (from a large space to a small space), but also when the mixed particles A are filled at the end of the fin portion 313, the gradually shrinking space at the end of the fin portion 313 can also return resistance to the mixed particles A, which is advantageous for the material strength of the heat dissipation fins 13 of the heat dissipation member 10 after molding.

[0034] The manufacturing method of the heat dissipation member provided by the present invention is to move axially within the mold cavity 31 of the pressurized rotating shaft 40 and only generate advanced friction and extrusion force in advance, so as to cause plastic deformation or crystal lattice defects in the aluminum material particles 22 and the copper material particles 21, reduce the interfacial bonding energy, fill and diffuse with each other, achieve the effect of bonding and forming different materials of the heat dissipation member 10, and overcome the problem that it is difficult to process and synthesize copper and aluminum materials in the conventional process. In addition, the manufacturing method provided by the present invention has simple steps, reduced energy consumption, and the copper material particles 21 and the aluminum material particles 22 can further select recycled materials, enabling material reuse and obtaining an environmentally friendly effect.

Explanation of Signs

[0035] 10 Heat dissipation member 11 Substrate 12 Center pillar 13 Heat dissipation fin 21 Copper material particles 22 Aluminum material particles 30 Mold 31 Mold cavity 311 Substrate part 312 Central part 313 Fin part 32 Mold opening 40 Pressurized rotating shaft A Mixed particles B Bonding surface H Thickness distance

Claims

1. Prepare a mold with a mold cavity formed inside. The mold cavity has a mold opening formed on one side surface of the mold. Inside the mold cavity, it includes a substrate part, a central part communicating between the substrate part and the mold opening, and a plurality of fin parts formed by being recessed radially around the groove walls in the groove of the central part. And a step of covering the radial extension range of the central part with the radial extension range of the substrate part. A step of disposing a substrate inside the substrate part. A step of uniformly mixing copper material particles and aluminum material particles to form mixed particles and disposing them inside the mold cavity. A step of inserting a pressurized rotating shaft into the mold cavity from the mold opening and rotating the axis of the pressurized rotating shaft while moving axially in the central part. A step of demolding to form a heat dissipation member. A manufacturing method of a heat dissipation member including the above steps.

2. The manufacturing method according to Claim 1, wherein the maximum distance at which the pressurized rotating shaft is inserted into the central part is smaller than the length of the central part.

3. The manufacturing method according to Claim 1 or 2, wherein the thickness distance formed in the direction of the mold opening of each fin part becomes thinner toward the end of the fin part in the central part.

4. A mold for manufacturing a heat dissipation member, with a mold cavity formed inside. The mold cavity has a mold opening formed on one side surface of the mold. Inside the cavity, it includes a substrate part, a central part communicating between the substrate part and the mold opening, and a plurality of fin parts formed by being recessed radially around the groove walls in the groove of the central part. And the radial extension range of the substrate part covers the radial extension range of the central part. A mold for manufacturing a heat dissipation member.

5. The mold according to Claim 4, wherein the thickness distance formed in the direction of the mold opening of each fin part becomes thinner toward the end of the fin part in the central part.

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