Magnetic grinding jig for heat dissipation substrate and mounting structure

Abstract

The utility model provides a magnetic grinding jig for a heat dissipation substrate and a mounting structure, the magnetic grinding jig for the heat dissipation substrate comprises a positioning frame, the positioning frame is connected with fixing parts, and the fixing parts are arranged on two opposite sides of the positioning frame; a V-shaped structure is arranged at the end, away from the positioning frame, of the fixing part. The jig provided by the utility model is used for fixing and supporting the heat dissipation substrate during magnetic grinding, the stable installation of the heat dissipation substrate can be realized through the V-shaped structure and design, the stability of the heat dissipation substrate in the magnetic grinding process is ensured, and the heat dissipation substrate is prevented from randomly rotating along with the action of a magnetic field; the structure design is simple, a complex fixing structure is not needed, therefore, positioning holes of the heat dissipation substrate and inner holes and dead corners of the surrounding area are fully exposed, and it is guaranteed that the surface of the heat dissipation substrate is uniform and free of gouges after the heat dissipation substrate is subjected to one-time all-dimensional polishing and magnetic grinding.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic polishing technology, specifically relating to a magnetic polishing fixture and mounting structure for heat dissipation substrates. Background Technology

[0002] An Insulated Gate Bipolar Transistor (IGBT) is a three-terminal semiconductor switching device primarily used in amplifiers. The heat sink is a common heat dissipation structure for semiconductor modules, its main function being to transfer heat outwards and provide mechanical support. The heat sink is the core heat dissipation structure and channel of the IGBT power module, and it is also a significant component with a high value proportion. The main cause of IGBT power module failure is thermal stress caused by excessive temperature; therefore, good thermal management is extremely important for the stability and reliability of IGBT power modules. Thus, the heat sink is a crucial structural component for reducing internal heat in IGBT power modules and maintaining stable module operation.

[0003] Heat sink substrates are typically made of pure copper, oxygen-free copper, or red copper, and are generally manufactured through shearing and stamping. After shearing and stamping, the product surface has significant burrs. The traditional method is to hand-sand it, which is inefficient and prone to leaving hard-to-reach areas and uneven surfaces.

[0004] Magnetic abrasive polishing is an effective method for polishing and deburring workpieces. Its working principle is to use magnetic field force to transmit to stainless steel grinding needles to perform high-frequency motion to process the surface and inner holes of the workpiece. However, at the same time, the workpiece being processed will also rotate at a high frequency under the action of the magnetic field, making the workpiece surface prone to collision and damage, affecting the appearance and use of the product.

[0005] To address this problem, this utility model provides a fixture for fixing a heat dissipation substrate for magnetic grinding. Utility Model Content

[0006] The purpose of this invention is to provide a fixture for magnetic grinding of heat dissipation substrates.

[0007] To achieve the objective of this utility model, the following technical solution is adopted:

[0008] In a first aspect, this utility model provides a magnetic polishing fixture for a heat dissipation substrate, the magnetic polishing fixture for a heat dissipation substrate comprising:

[0009] A positioning frame, wherein a fixing component is connected to the positioning frame and the fixing component is disposed on opposite sides of the positioning frame;

[0010] The fixed component has a V-shaped structure with a fixed heat dissipation substrate positioning hole at one end away from the positioning frame;

[0011] The V-shaped structure includes a first rod and a second rod having the same endpoint, and at the same endpoint, the first rod and the second rod form a V-shaped angle, and the end of the first rod or the second rod away from the same endpoint is connected to the end of the fixing component.

[0012] The fixture provided by this utility model is used to fix and support a heat dissipation substrate during magnetic polishing. The heat dissipation substrate is mounted on the fixing component, and a V-shaped fixing structure is set on the fixing component, which matches the positioning hole of the heat dissipation substrate. The V-shaped structure and size design can achieve stable installation of the heat dissipation substrate, ensuring its stability during the magnetic polishing process and preventing it from rotating arbitrarily under the influence of the magnetic field. The structural design is simple and does not require a complex fixing structure, thereby fully exposing the positioning hole of the heat dissipation substrate and the inner hole and dead corner of the surrounding area, ensuring that the heat dissipation substrate is polished in one go from all directions. After magnetic polishing, the surface of the heat dissipation substrate is uniform and free of scratches.

[0013] Preferably, the V-shaped structures located on the same side of the positioning frame are arranged opposite each other, wherein the opposite arrangement is such that the sharp corner of the V-shaped angle in one V-shaped structure points towards the other V-shaped structure along the side of the positioning frame.

[0014] Preferably, the V-angle of the V-shaped structure is 120-140°, for example, it can be 120°, 122°, 125°, 128°, 130°, 132°, 135°, 138° or 140°, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0015] Preferably, the length of the first or second rod of the V-shaped structure is 13-16mm, for example, it can be 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm or 16mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0016] Preferably, the distance from the end of the fixing component connected to the positioning frame to the sharp corner of the V-shaped structure is 55-58mm, for example, it can be 55mm, 55.5mm, 56mm, 56.5mm, 57mm, 57.5mm or 58mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] Preferably, the total length of the fixing component and the V-shaped structure is 68-70mm, for example, it can be 68mm, 68.2mm, 68.5mm, 68.8mm, 69mm, 69.2mm, 69.5mm, 69.8mm or 70mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0018] Preferably, each side of the positioning frame is provided with at least two fixing components, such as 2, 4, 6 or 8, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0019] Preferably, on the same side of the positioning frame, the distance between adjacent positioning components is 90-92mm, for example, it can be 90mm, 90.2mm, 90.5mm, 90.8mm, 91mm, 91.2mm, 91.5mm, 91.8mm or 92mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0020] Preferably, the diameter of the fixing component is 3-5mm, for example, it can be 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] Preferably, the positioning frame is connected to the fixing component by welding or threading.

[0022] Preferably, the positioning frame is hollow square or hollow circle.

[0023] Secondly, this utility model provides a heat dissipation substrate mounting structure for a magnetic grinding fixture for heat dissipation substrate as described in the first aspect, wherein the V-shaped structure passes through the positioning holes of the heat dissipation substrate, and the position of the heat dissipation substrate is fixed at the V-shaped sharp corner of the V-shaped structure.

[0024] The distance between the surface of the heat dissipation substrate and the end of the V-shaped structure is 3-15mm, for example, it can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] The V-shaped apex is located at the same endpoint of the first and second rods.

[0026] After installation, ensure that the distance between the surface of the heat dissipation substrate and the bottom of the magnetic polishing groove is within 15mm to ensure that the magnetic polishing steel needles jump to reach the surface of the heat dissipation substrate and achieve complete polishing.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The fixture provided by this utility model is used to fix and support the heat dissipation substrate during magnetic grinding. The V-shaped structure and size design can achieve stable installation of the heat dissipation substrate, ensuring its stability during the magnetic grinding process and preventing it from rotating randomly under the influence of the magnetic field. The structure design is simple and does not require a complicated fixing structure, thus fully exposing the positioning holes of the heat dissipation substrate and the inner holes and dead corners of the surrounding area, ensuring that the heat dissipation substrate is polished in one go. After magnetic grinding, the surface of the heat dissipation substrate is uniform and free of scratches. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the magnetic polishing fixture for the heat dissipation substrate provided in Example 1;

[0030] Wherein: 1-positioning frame; 2-fixing component; 3-V-shaped structure; 31-first rod; 32-second rod;

[0031] Figure 2 A schematic diagram of the mounting structure of the magnetic abrasive fixture for the heat dissipation substrate provided in Application Example 1;

[0032] Figure 3 This is a schematic diagram of the use of the magnetic grinding fixture for the heat dissipation substrate provided in Example 1. Detailed Implementation

[0033] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] This embodiment provides a method such as Figure 1 The magnetic polishing fixture for the heat dissipation substrate shown includes:

[0038] Positioning frame 1, the shape of positioning frame 1 is a hollow square;

[0039] The positioning frame 1 is connected to a fixing component 2. The fixing components 2 are set on opposite sides of the positioning frame 1, with two fixing components 2 on each side. The distance between the two fixing components 2 on the same side of the positioning frame 1 is 91.2 mm, and the diameter of the fixing component 2 is 4 mm.

[0040] The fixed component 2 has a V-shaped structure 3 with a fixed heat dissipation substrate positioning hole at one end away from the positioning frame. The V-shaped structure 3 includes a first rod 31 and a second rod 32 with the same endpoint. At the same endpoint, the first rod 31 and the second rod 32 form a V-shaped angle. The end of the second rod 32 away from the same endpoint is connected to the end of the fixed component. The V-shaped structures on the same side of the positioning frame are arranged opposite each other. The opposite arrangement is that the sharp angle of the V-shaped angle in one V-shaped structure points to the other V-shaped structure along the side of the positioning frame.

[0041] The V-angle of the V-shaped structure 3 is 130°, the length of the first rod 31 of the V-shaped structure 3 is 13.5mm, and the length of the second rod 32 is 16mm.

[0042] The distance from the end of the fixing component 2 connected to the positioning frame to the sharp corner of the V-shaped structure 3 is 56mm;

[0043] The total length of the fixed component and the V-shaped structure is 69.5 mm.

[0044] The entire material of the magnetic grinding fixture for the heat dissipation substrate is SUS316L stainless steel.

[0045] Example 2

[0046] This embodiment provides a magnetic polishing fixture for a heat sink substrate, the magnetic polishing fixture for a heat sink substrate comprising:

[0047] Positioning frame 1, the shape of positioning frame 1 is a hollow square;

[0048] The positioning frame 1 is connected to a fixing component 2. The fixing components 2 are set on opposite sides of the positioning frame 1, with two fixing components 2 on each side. The distance between the two fixing components 2 on the same side of the positioning frame 1 is 90mm, and the diameter of the fixing component 2 is 3mm.

[0049] The fixed component 2 has a V-shaped structure 3 with a fixed heat dissipation substrate positioning hole at one end away from the positioning frame. The V-shaped structure 3 includes a first rod 31 and a second rod 32 with the same endpoint. At the same endpoint, the first rod 31 and the second rod 32 form a V-shaped angle. The end of the second rod 32 away from the same endpoint is connected to the end of the fixed component. The V-shaped structures on the same side of the positioning frame are arranged opposite each other. The opposite arrangement is that the sharp angle of the V-shaped angle in one V-shaped structure points to the other V-shaped structure along the side of the positioning frame.

[0050] The V-angle of the V-shaped structure 3 is 120°, the length of the first rod 31 of the V-shaped structure 3 is 13.5 mm, and the length of the second rod 32 is 16 mm.

[0051] The distance from the end of the fixing component 2 connected to the positioning frame to the sharp corner of the V-shaped structure 3 is 55mm;

[0052] The total length of the fixed component and the V-shaped structure is 68mm.

[0053] The entire material of the magnetic grinding fixture for the heat dissipation substrate is SUS316L stainless steel.

[0054] Example 3

[0055] This embodiment provides a magnetic polishing fixture for a heat sink substrate, the magnetic polishing fixture for a heat sink substrate comprising:

[0056] Positioning frame 1, the shape of positioning frame 1 is a hollow square;

[0057] The positioning frame 1 is connected to a fixing component 2. The fixing components 2 are set on opposite sides of the positioning frame 1, with two fixing components 2 on each side. The distance between the two fixing components 2 on the same side of the positioning frame 1 is 92mm, and the diameter of the fixing component 2 is 5mm.

[0058] The fixed component 2 has a V-shaped structure 3 with a fixed heat dissipation substrate positioning hole at one end away from the positioning frame. The V-shaped structure 3 includes a first rod 31 and a second rod 32 with the same endpoint. At the same endpoint, the first rod 31 and the second rod 32 form a V-shaped angle. The end of the second rod 32 away from the same endpoint is connected to the end of the fixed component. The V-shaped structures on the same side of the positioning frame are arranged opposite each other. The opposite arrangement is that the sharp angle of the V-shaped angle in one V-shaped structure points to the other V-shaped structure along the side of the positioning frame.

[0059] The V-angle of the V-shaped structure 3 is 140°, the length of the first rod 31 of the V-shaped structure 3 is 13.5mm, and the length of the second rod 32 is 16mm;

[0060] The distance from the end of the fixing component 2 connected to the positioning frame to the sharp corner of the V-shaped structure 3 is 58mm;

[0061] The total length of the fixed component and the V-shaped structure is 70mm.

[0062] The entire material of the magnetic grinding fixture for the heat dissipation substrate is SUS316L stainless steel.

[0063] Comparative Example 1

[0064] This comparative example provides a magnetic grinding fixture for a heat dissipation substrate. Compared with Example 1, the fixing component does not have a V-shaped structure, but all other aspects are the same as in Example 1.

[0065] Application Example 1

[0066] This application example provides a way to... Figure 2 The heat sink mounting structure of the magnetic abrasive fixture for the heat sink substrate shown includes:

[0067] The V-shaped structure 3 of the magnetic grinding fixture for the heat dissipation substrate passes through the positioning holes of the heat dissipation substrate, and the position of the heat dissipation substrate is fixed at the V-shaped sharp corner of the V-shaped structure 3.

[0068] The distance between the upper surface of the heat dissipation substrate and the end of the V-shaped structure 3 is 15mm.

[0069] The heat sink is mounted on the magnetic polishing fixture for heat sinks provided in the embodiments and comparative examples according to the mounting structure described in Application Example 1. The mounted heat sink and the magnetic polishing fixture are placed in the magnetic polishing tank for magnetic polishing. The polishing frequency is 60Hz and the polishing time is 5-10 minutes. A schematic diagram of the use of the magnetic polishing fixture for heat sinks is shown below. Figure 3 As shown.

[0070] The polished heat dissipation substrate was obtained, and its surface roughness was measured. The results are listed in Table 1.

[0071] Table 1

[0072] Surface roughness Surface roughness of positioning holes Example 1 1.2μm 1.2μm Example 2 1.3μm 1.3μm Example 3 1.2μm 1.2μm Comparative Example 1 / /

[0073] In the table, " / " indicates no data.

[0074] As shown in Table 1, the magnetic polishing fixture provided by this invention enables the fixed installation of the heat dissipation substrate for magnetic polishing, resulting in uniform surface roughness of the heat dissipation substrate and the positioning holes, and allowing for one-time all-around polishing of the heat dissipation substrate. Compared to Example 1, Comparative Example 1 does not have a V-shaped structure, making it difficult to fix the heat dissipation substrate, and the surface of the heat dissipation substrate cannot achieve uniform polishing.

[0075] In summary, the fixture provided by this utility model is used to fix and support the heat dissipation substrate during magnetic grinding. The V-shaped structure and size design can achieve stable installation of the heat dissipation substrate, ensuring its stability during the magnetic grinding process and preventing it from rotating arbitrarily under the influence of the magnetic field. The structural design is simple and does not require a complex fixing structure, thus fully exposing the positioning holes of the heat dissipation substrate and the inner holes and dead corners of the surrounding area, ensuring that the heat dissipation substrate is polished in one go from all directions. After magnetic grinding, the surface of the heat dissipation substrate is uniform and free of scratches.

[0076] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A magnetic grinding fixture for a heat dissipation substrate, characterized in that, The magnetic polishing fixture for the heat dissipation substrate includes: A positioning frame, wherein a fixing component is connected to the positioning frame and the fixing component is disposed on opposite sides of the positioning frame; The fixed component has a V-shaped structure at the end away from the positioning frame; The V-shaped structure includes a first rod and a second rod having the same endpoint, and at the same endpoint, a V-shaped angle is formed between the first rod and the second rod, and the end of the first rod or the second rod away from the same endpoint is connected to the end of the fixing component; The V-shaped structures located on the same side of the positioning frame are arranged opposite each other, and the opposite arrangement is that the sharp corner of the V-shaped angle in one V-shaped structure points to the other V-shaped structure along the side of the positioning frame.

2. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, The V-angle of the V-shaped structure is 120-140°.

3. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, The length of the first or second rod of the V-shaped structure is 13-16mm.

4. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, The distance from the end of the fixing component connected to the positioning frame to the sharp corner of the V-shaped structure is 55-58mm.

5. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, The total length of the fixing component and the V-shaped structure is 68-70mm.

6. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, At least two fixing components are provided on each side of the positioning frame.

7. The magnetic grinding fixture for heat dissipation substrates according to claim 6, characterized in that, On the same side of the positioning frame, the distance between adjacent positioning components is 90-92mm.

8. The magnetic grinding fixture for heat dissipation substrates according to claim 1, characterized in that, The positioning frame is hollow square or hollow circle in shape.

9. A mounting structure for a magnetic grinding fixture for a heat dissipation substrate as described in any one of claims 1-8, characterized in that, The V-shaped structures pass through the positioning holes of the heat dissipation substrate, and the position of the heat dissipation substrate is fixed at the V-shaped sharp corner of the V-shaped structure. The distance between the surface of the heat dissipation substrate and the end of the V-shaped structure is 3-15mm.

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