A forging die for forming a columnar heat dissipation structure

Abstract

This utility model relates to the technical field of forging, and in particular to a forging die for forming a columnar heat dissipation structure. The die includes a lower die assembly and an upper die assembly. The lower die assembly has a lower die base and a lower die insert. A stepped misalignment structure is formed between the end of the lower die insert facing the upper die assembly and the corresponding end of the lower die base. The distance between them constitutes a forging die cavity, which is used to accommodate the metal blank and restrict the flow range of the blank during forging. The upper die assembly has an upper clamping plate and a convex template. The end of the convex template facing the lower die assembly has a columnar blind hole, allowing the upper die assembly to apply pressure to the metal blank during forging, forming a heat dissipation column. In summary, through structural innovation and process optimization, the technical difficulties in stamping high-density columnar heat dissipation structures are effectively solved, achieving high-quality, high-efficiency, and low-cost manufacturing of heat dissipation structures, meeting the increasingly sophisticated and high-performance development needs of current electronic heat dissipation products.

Description

Technical Field

[0001] This utility model relates to the technical field of forging, and in particular to a forging die for forging a columnar heat dissipation structure. Background Technology

[0002] Existing heat dissipation structures mainly fall into two categories: air cooling and liquid cooling. Air cooling structures typically employ a thin-fin design, increasing the heat dissipation area to promote air convection and thus achieve heat dissipation; while liquid cooling structures mostly use columnar heat sinks, utilizing the flow of liquid cooling medium between the columns to remove heat, resulting in higher heat dissipation efficiency.

[0003] To improve heat dissipation, more and more technologies have been exploring the direct molding of high-density, highly arrayed columnar heat dissipation structures onto heat-dissipating metal plates in recent years, aiming to reduce assembly complexity and overall thermal resistance. Among these technologies, stamping technology has garnered significant attention due to its high efficiency and cost advantages. However, traditional stamping dies often face numerous challenges when molding high-density columnar structures:

[0004] Demolding difficulties: The columnar structure is long, thin and dense, and the stamped product is prone to sticking to the blind hole of the mold, resulting in a complicated and inefficient demolding process, and even mold damage.

[0005] Uneven material flow: Under confined conditions, the plastic flow of the billet is restricted, which can easily lead to columnar structural forming defects, such as fracture, uneven deformation, or insufficient depth.

[0006] High mold manufacturing and maintenance costs: To ensure molding accuracy and mold life, traditional mold designs are often complex, resulting in high manufacturing and maintenance costs.

[0007] High load on molding equipment: Traditional processes require high equipment load and long molding cycles when forming high-density columnar arrays, making it difficult to meet mass production needs.

[0008] Therefore, how to design a stamping die that can ensure efficient molding of large-area, high-density columnar heat dissipation structures while also facilitating demolding, reducing material flow difficulties and equipment load has become an urgent problem for the industry. Utility Model Content

[0009] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0010] This utility model provides a forging die for forming a columnar heat dissipation structure, including a lower die assembly and an upper die assembly that are mated and connected to each other. The lower die assembly is fixed to the forging platform of the forging equipment, and the upper die assembly is fixed to the lower punch of the forging equipment. Under the drive of the forging equipment, the upper die assembly performs a forging operation on the metal billet placed on the lower die assembly. The lower die assembly has a lower die base and a lower die insert that are fixed to each other. The end of the lower die insert facing the upper die assembly and the corresponding end of the lower die base form a stepped misalignment structure. The distance between the two forms a forging die cavity, which is used to accommodate the metal billet and restrict the flow range of the billet during forging. The upper die assembly has an upper clamping plate and a convex plate that are fixed to each other. The end of the convex plate facing the lower die assembly has a columnar blind hole, so that the upper die assembly applies pressure to the metal billet during forging, causing the billet to undergo plastic deformation and plastic flow, entering the columnar blind hole to form a heat dissipation column.

[0011] Furthermore, the columnar blind hole is designed with a tapered structure, with its opening diameter being larger than its bottom diameter, in order to form a tapered heat dissipation column.

[0012] Furthermore, the opening of the columnar blind hole is also provided with a conical opening, thereby forming the sloping surface at the base of the heat dissipation column.

[0013] Furthermore, the lower mold insert has a strip-shaped groove at the end facing the upper mold assembly. Multiple strip-shaped grooves are connected to each other, thereby forming a strip-shaped ridge on the back of the metal blank relative to the heat dissipation column.

[0014] Furthermore, the end of the lower mold insert facing the upper mold assembly is also provided with a side groove. The side groove extends from the strip groove toward the side of the lower mold insert, thereby forming a side protrusion structure on the side of the back of the heat dissipation column of the metal blank.

[0015] Furthermore, the end of the lower mold insert facing the upper mold assembly is also provided with a circular hole groove, which extends to a certain depth into the interior of the lower mold insert, thereby forming a corresponding columnar body on the back of the metal blank relative to the heat dissipation column.

[0016] Furthermore: the lower die base is provided with square grooves at both ends corresponding to the short side of the metal blank. The side of the square groove close to the metal blank is connected to the forging die cavity, thereby forming a square lug at the short side of the metal blank.

[0017] Furthermore, the end of the convex template facing the lower mold assembly is also provided with a convex groove, which extends into the interior of the convex template to a certain depth, thereby forming the heat dissipation boss of the heat sink plate.

[0018] Furthermore, a columnar blind hole is made in the groove of the punch corresponding to the position of the heat dissipation boss. When the punch is pressed down, the metal blank flows into the columnar blind hole under pressure, forming a heat dissipation column structure on the heat dissipation boss.

[0019] Furthermore, the bottom of the lower mold insert is provided with a discharge through hole and a discharge ejector rod. The discharge ejector rod is inserted into the discharge through hole and can be ejected upward along the discharge through hole, thereby ejecting the metal billet when the mold is opened.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. Improve molding efficiency and quality: The stepped staggered structure between the lower die insert and the lower die base forms a limited forging die cavity. The forging die cavity effectively restricts the flow range of the blank, avoids lateral overflow of material and uneven deformation, improves the uniformity and dimensional accuracy of heat dissipation column molding, and significantly improves the yield.

[0022] 2. Self-release design: The columnar blind holes adopt an inverted conical design, with the hole diameter gradually decreasing from the opening to the bottom, forming a micro-conical structure. This effectively reduces frictional resistance during demolding, enabling the heat dissipation pillars to release naturally, reducing demolding difficulty and cost. The auxiliary demolding rod design ensures reliable demolding even under stringent conditions.

[0023] 3. Enhanced structural stability: The columnar blind hole opening is provided with a conical opening, forming a 45° slope at the root of the heat dissipation column, which enhances the bonding strength between the heat dissipation column and the heat dissipation plate, improves mechanical strength and durability, and adapts to more demanding working environments.

[0024] 4. Multi-structure integrated molding: The lower mold insert is equipped with strip grooves, side grooves and round hole grooves, which can simultaneously form the strip ridges, side protrusions and columnar structures on the back of the heat sink, realizing efficient integrated molding of complex multi-structures, reducing subsequent processing steps and saving production costs.

[0025] 5. Mold cost and maintenance optimization: By having the lower mold base bear the forming of the square lugs, the size of the lower mold insert is reduced, improving the flexibility of mold design and saving manufacturing costs; the modular insert design facilitates maintenance and replacement, extending the service life of the mold and economic benefits.

[0026] Through the above improvements, this utility model effectively solves the technical problems in the stamping and forming of high-density columnar heat dissipation structures by means of structural innovation and process optimization, and realizes the manufacturing of heat dissipation structures with high quality, high efficiency and low cost, which meets the development needs of increasingly refined and high-performance electronic heat dissipation products.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a cross-sectional schematic diagram of the stamping state of this utility model;

[0031] Figure 3 This is a cross-sectional schematic diagram of the demolded state of this utility model;

[0032] Figure 4 This is a structural schematic diagram of the lower mold base and lower mold insert of this utility model;

[0033] Figure 5 This is a schematic diagram of the convex template and columnar blind hole of this utility model;

[0034] Figure 6 This is a schematic diagram of the heat sink and strip-shaped ridges of this utility model;

[0035] Figure 7 This is a schematic diagram of the heat dissipation column and heat dissipation boss of this utility model.

[0036] The reference numerals and names in the figure are as follows:

[0037] 10 Lower mold assembly; 11 Lower mold base; 12 Square groove; 20 Lower mold insert; 21 Strip groove; 22 Side groove; 23 Round hole groove; 24 Material discharge through hole; 25 Material discharge ejector pin; 30 Upper mold assembly; 31 Upper clamping plate; 40 convex mold plate; 41 Columnar blind hole; 42 Conical opening; 43 convex mold groove; 50 Heat dissipation plate; 51 Heat dissipation column; 52 Strip-shaped convex ridge; 53 Side protrusion; 54 Columnar body; 55 Square lug; 56 Heat dissipation boss. Detailed Implementation

[0038] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] Please see Figures 1 to 7In this embodiment of the present invention, a forging die for forming a columnar heat dissipation structure includes a lower die assembly 10 and an upper die assembly 30 that are mated and connected to each other. The lower die assembly 10 is fixedly connected to the forging platform of the forging equipment, and the upper die assembly 30 is fixedly connected to the lower punch of the forging equipment, so that the upper die assembly 30 performs forging operation on the metal billet placed on the lower die assembly 10 under the drive of the forging equipment. The lower die assembly 10 is provided with a lower die base 11 and a lower die insert 20 that are fixedly connected to each other, and the end of the lower die insert 20 facing the upper die assembly 30 is... A stepped misalignment structure is formed between the corresponding ends of the upper die assembly and the lower die base 11. The distance between the two constitutes the forging die cavity, which is used to accommodate the metal billet and restrict the flow range of the billet during forging. The upper die assembly 30 is provided with an upper clamping plate 31 and a convex plate 40 fixedly connected to each other. The end of the convex plate 40 facing the lower die assembly 10 is provided with a columnar blind hole 41, so that the upper die assembly 30 applies pressure to the metal billet during forging, causing the billet to undergo plastic deformation as a whole, generating plastic flow, and entering the columnar blind hole 41 to form a heat dissipation column 51.

[0040] Specifically, traditional air-cooled heat dissipation structures typically use thin fins for heat dissipation, while liquid-cooled heat dissipation structures usually employ columnar structures. To improve heat dissipation efficiency, columnar heat dissipation structures can be directly stamped onto the heat dissipation metal plate. However, traditional stamping dies are difficult to use for efficiently forming high-density arrays of columnar structures due to difficulties in demolding or uneven material flow. Therefore, optimization and improvement are necessary.

[0041] This invention provides a lower die insert 20 in the lower die assembly 10. By utilizing the misalignment structure between the lower die insert 20 and the lower die base 11, a forging die cavity is formed. This cavity allows metal blanks to be placed between forging operations and also limits the metal blanks during the forging process, ensuring that they can only plastically flow into the columnar blind holes 41. This enables the rapid stamping of a large-area columnar heat dissipation structure with an array distribution.

[0042] Secondly, to successfully complete the stamping of the columnar structure, large-tonnage forging equipment, such as a 1000-ton hydraulic press, is required. This design meets the process requirements of large-tonnage forging equipment such as a 1000-ton hydraulic press, ensuring sufficient forming force can be applied to the high-strength metal billet to guarantee the dimensional accuracy and mechanical properties of the columnar heat dissipation structure.

[0043] Therefore, by setting a lower die insert 20 in the lower die assembly 10 and adopting a stepped misalignment structure between the lower die insert 20 and the lower die base 11 to form a limited forging die cavity, this utility model can achieve efficient positioning and plastic flow restriction of the metal blank, so that the blank can only flow plastically along the predetermined columnar blind hole 41 direction, thereby stamping out a large area, dense array of columnar heat dissipation structure in one go.

[0044] like Figure 5 and Figure 7 As shown, preferably, the columnar blind hole 41 is designed as a tapered structure with an opening diameter larger than the bottom diameter, so as to form a tapered heat dissipation column 51.

[0045] Specifically, to facilitate stamping and demolding, preferably, the columnar blind hole 41 is configured as a conical blind hole, with its opening diameter slightly larger than its bottom diameter, forming a smoothly transitioning inverted conical structure, thereby stamping out a heat dissipation column 51 with a micro-conical structure. For example, the opening diameter of the conical blind hole is set to 2.7 cm, the bottom diameter to 2.5 cm, and the depth to 8.7 cm, thus forming a micro-conical blind hole with a taper of 1:43.5 (corresponding to a cone angle of approximately 0.66°).

[0046] Secondly, due to the design of the tapered blind hole, after the metal blank is stamped, when the punch plate 40 moves upward to demold, the tapered heat dissipation column 51 can automatically dislodge from the tapered blind hole. Because of the tapered design of the tapered blind hole (opening > bottom), the contact area between the heat dissipation column 51 and the hole wall gradually decreases during demolding, thereby reducing adhesion and achieving self-demolding. Since the contact area between the lower die insert 20 and the metal blank is relatively large, the friction and adhesion generated during forging are mainly concentrated on the surface of the lower die insert 20, while the contact area between the heat dissipation column 51 and the columnar blind hole 41 is relatively small. Furthermore, the tapered structure design further reduces friction during demolding, allowing the heat dissipation column 51 to smoothly dislodge from the columnar blind hole 41.

[0047] In addition, if the metal adhesion between the columnar blind hole 41 and the heat dissipation column 51 is too strong, resulting in difficulties in the self-demolding operation, a demolding hole and demolding rod, as used in the prior art, can be provided in the convex platen 40. The demolding rod can be used to assist in the demolding operation of the forged part after forging. If the frictional resistance between the heat dissipation column 51 and the blind hole exceeds the ejection force threshold of the equipment, demolding can be forced by the demolding rod.

[0048] like Figure 5 and Figure 7 As shown, preferably, the opening of the columnar blind hole 41 is also provided with a conical opening 42, thereby forming the inclined surface of the root of the heat dissipation column 51.

[0049] Specifically, to facilitate stamping and allow the plastic flow of the metal billet to easily enter the columnar blind hole 41, a tapered opening 42 is preferably provided at the opening of the columnar blind hole 41. For example, a tapered opening 42 with a cone apex angle of 90° is provided, so that the root of the heat dissipation column 51 forms a slope at 45° with the horizontal plane. Furthermore, the sloped structure at the root of the heat dissipation column 51 can also increase the structural strength between the heat dissipation column 51 and the heat dissipation plate 50.

[0050] like Figure 4 and Figure 6As shown, preferably, the end of the lower mold insert 20 facing the upper mold assembly 30 is also provided with a strip-shaped groove 21, and multiple strip-shaped grooves 21 are connected to each other, thereby forming a strip-shaped ridge 52 on the back of the metal blank relative to the heat dissipation column 51.

[0051] Specifically, since a heat dissipation column 51 is provided on one side of the heat dissipation plate 50, it can be formed through the columnar blind hole 41; and a strip-shaped ridge 52 is provided on the other side, a strip-shaped groove 21 needs to be provided on the lower mold insert 20. The corresponding strip-shaped ridge 52 on the heat dissipation plate 50 is formed by the stamping cooperation between the convex template 40 and the lower mold insert 20.

[0052] like Figure 4 and Figure 6 As shown, preferably, the end of the lower mold insert 20 facing the upper mold assembly 30 is also provided with a side groove 22. The side groove 22 extends from the strip groove 21 toward the side of the lower mold insert 20, thereby forming a side protrusion 53 structure on the side of the back of the metal blank heat dissipation column 51.

[0053] Specifically, a side protrusion 53 is provided on the side of the heat sink 50. Therefore, it can extend into the side of the lower mold insert 20 within the corresponding strip groove 21 to form a side groove, thereby forming the corresponding side protrusion 53. The strip ridge 52 and the side protrusion 53 are connected by the strip groove 21 and the side groove 22 to form an integral structure, enhancing the structural integrity of the heat sink 50.

[0054] like Figure 4 and Figure 6 As shown, preferably, the end of the lower mold insert 20 facing the upper mold assembly 30 is also provided with a circular hole groove 23. The circular hole groove 23 extends to a certain depth inside the lower mold insert 20, thereby forming a corresponding columnar body 54 on the back of the metal blank relative to the heat dissipation column 51.

[0055] Specifically, on the back of the heat sink 50 relative to the heat sink column 51, there are also multiple columnar bodies 54. The columnar bodies 54 are independent of the strip groove 21 and the side groove 22. Therefore, a corresponding conical groove needs to be set separately on the back of the lower die insert 20 so that the corresponding columnar body 54 can be formed during the stamping process.

[0056] Secondly, the circular hole groove 23 can also be configured as a conical blind hole, so that the formed columnar body 54 structure has a conical transition section, which facilitates stamping and demolding. In addition, chamfers are provided at the opening and bottom of the circular hole groove 23, so that the top and root of the columnar body 54 are also formed with corresponding natural rounded corners, which facilitates stamping and demolding.

[0057] like Figure 4 , Figure 6 and Figure 7As shown, preferably, the lower die base 11 is provided with square grooves 12 at the two ends corresponding to the short side of the metal blank. The side of the square groove 12 close to the metal blank is connected to the forging die cavity, thereby forming a square lug 55 at the short side of the metal blank.

[0058] Specifically, in order to facilitate the fixing and installation of the heat sink 50, it is preferable to also provide square lugs 55 at the short sides of both ends. By directly setting square grooves 12 on the lower mold base 11, the corresponding square lugs 55 can be formed, thereby reducing the size of the lower mold insert 20 and saving costs.

[0059] like Figure 5 and Figure 7 As shown, preferably, the end of the convex template 40 facing the lower mold assembly 10 is also provided with a convex groove 43, which extends into the interior of the convex template 40 to a certain depth, thereby forming the heat dissipation boss 56 of the heat dissipation plate 50.

[0060] Specifically, on the side of the heat sink 50 where the heat sink column 51 is located, a heat sink boss 56 is also provided. By providing a punch groove 43 at the corresponding end of the punch template 40, the metal billet is plastically flowed into the punch groove 43 during the forging process with the lower die insert 20, thereby forming the corresponding heat sink boss 56.

[0061] like Figure 5 and Figure 7 As shown, preferably, a columnar blind hole 41 is opened in the punch groove 43 at the position corresponding to the heat dissipation boss 56. When the punch plate 40 is pressed down, the metal blank flows into the columnar blind hole 41 under pressure, and heat dissipation column 51 structure is formed on the heat dissipation boss 56.

[0062] Specifically, a columnar blind hole 41 is provided in the punch groove 43 to form the heat dissipation column 51 on the heat dissipation boss 56. The heat dissipation boss 56 can also be provided with heat dissipation columns 51, so the same columnar blind hole 41 can be opened in the punch groove 43, and then the heat dissipation column 51 on the heat dissipation boss 56 can be stamped.

[0063] like Figures 2 to 4 As shown, preferably, the bottom of the lower mold insert 20 is provided with a discharge through hole 24 and a discharge ejector 25. The discharge ejector 25 is inserted into the discharge through hole 24 and can be ejected upward along the discharge through hole 24, so as to eject the metal blank when the mold is opened.

[0064] Specifically, a discharge through hole 24 is provided in the lower die insert 20, and a discharge ejector 25 is provided in the discharge through hole 24. When the die is opened, the discharge ejector 25 ejects the forged part, causing the forged part in the lower die insert 20 to detach from the lower die insert 20, which facilitates discharge and improves the efficiency of forging discharge.

[0065] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A forging die for forming a columnar heat dissipation structure, characterized in that, The device includes a lower die assembly (10) and an upper die assembly (30) that are connected to each other. The lower die assembly (10) is fixed to the forging platform of the forging equipment, and the upper die assembly (30) is fixed to the lower punch of the forging equipment. Under the drive of the forging equipment, the upper die assembly (30) performs forging operations on the metal billet placed on the lower die assembly (10). The lower die assembly (10) is provided with a lower die base (11) and a lower die insert (20) that are fixed to each other. The end of the lower die insert (20) facing the upper die assembly (30) corresponds to the end of the lower die base (11). The parts form a stepped staggered structure, and the distance between them constitutes a forging die cavity. This die cavity is used to accommodate the metal billet and restrict the flow range of the billet during forging. The upper die assembly (30) is provided with an upper clamping plate (31) and a convex plate (40) fixed to each other. The end of the convex plate (40) facing the lower die assembly (10) is provided with a columnar blind hole (41), so that the upper die assembly (30) applies pressure to the metal billet during forging, causing the billet to undergo plastic deformation as a whole, generating plastic flow, and entering the columnar blind hole (41) to form a heat dissipation column (51).

2. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The columnar blind hole (41) is designed as a tapered structure with an opening diameter larger than the bottom diameter to form a tapered heat dissipation column (51).

3. The forging die for forming a columnar heat dissipation structure according to claim 2, characterized in that, The opening of the columnar blind hole (41) is also provided with a conical opening (42), thereby forming the slope of the root of the heat dissipation column (51).

4. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The lower mold insert (20) is also provided with a strip groove (21) at the end facing the upper mold assembly (30). Multiple strip grooves (21) are connected to each other, thereby forming a strip ridge (52) on the back of the metal blank relative to the heat dissipation column (51).

5. The forging die for forming a columnar heat dissipation structure according to claim 4, characterized in that, The end of the lower mold insert (20) facing the upper mold assembly (30) is also provided with a side groove (22). The side groove (22) extends from the strip groove (21) toward the side of the lower mold insert (20), thereby forming a side protrusion (53) structure on the side of the back of the metal blank heat sink column (51).

6. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The end of the lower mold insert (20) facing the upper mold assembly (30) is also provided with a round hole groove (23). The round hole groove (23) extends to a certain depth inside the lower mold insert (20), thereby forming a corresponding columnar body (54) on the back of the metal blank relative to the heat dissipation column (51).

7. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The lower die base (11) is provided with square grooves (12) at the two ends of the short side of the metal blank. The side of the square groove (12) close to the metal blank is connected to the forging die cavity, so that a square lug (55) is formed at the short side of the metal blank.

8. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The end of the convex template (40) facing the lower mold assembly (10) is also provided with a convex groove (43), which extends into the interior of the convex template (40) to form a heat dissipation boss (56) of the heat dissipation plate (50).

9. The forging die for forming a columnar heat dissipation structure according to claim 8, characterized in that, A columnar blind hole (41) is opened in the groove (43) of the punch corresponding to the heat dissipation boss (56). When the punch plate (40) is pressed down, the metal blank flows into the columnar blind hole (41) under pressure and forms a heat dissipation column (51) structure on the heat dissipation boss (56).

10. The forging die for forming a columnar heat dissipation structure according to claim 1, characterized in that, The bottom of the lower mold insert (20) is provided with a discharge through hole (24) and a discharge ejector (25). The discharge ejector (25) is inserted into the discharge through hole (24) and can be ejected upward along the discharge through hole (24), so that the metal blank can be ejected when the mold is opened.

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