A structure of a forming die for a herringbone-shaped heat dissipation fin and a method of forming a herringbone-shaped heat dissipation fin

Abstract

The present application relates to a kind of U-shaped heat dissipation fin forming die structure and U-shaped heat dissipation fin forming method, U-shaped heat dissipation fin forming die structure includes continuous positive and negative bending die, punch piercing die being arranged at one side of continuous positive and negative bending die;Continuous positive and negative bending die includes bending punch, first forming insert, positioning pin;First forming insert is formed with the first positioning portion of the protrusion for the fixed bending plate on it;Positioning pin is detachably arranged on first forming insert, and relative to first forming insert, and form punch bending forming cavity between first positioning portion.Stretching into punch bending forming cavity by bending punch can complete the end bending forming of the bending plate;The bending edge of the bending plate that has been formed is fixed on first positioning portion, and continuous positive and negative bending is realized by successive punching.The bending plate that has been bent is placed on the punch piercing die on one side, and punch piercing process is executed, and U-shaped heat dissipation fin can be obtained.

Description

Technical Field

[0001] This invention relates to the field of sheet metal forming mold technology, and in particular to a Z-shaped heat sink forming mold structure and a Z-shaped heat sink forming method. Background Technology

[0002] Currently, no corresponding molds or processes have been developed for continuous forward and reverse bending and stamping forming of thin plates (such as aluminum plates) with a thickness of less than 0.5mm, both domestically and internationally. At present, heat sinks or heat plates for various electronic devices commonly use stacked heat sink fins, and there is no relevant research on the forming process of a novel heat dissipation structure—the Z-shaped heat sink fin. The Z-shaped heat sink fin can be formed by processing aluminum plates and can be used in the heat dissipation structure of various electronic devices. It differs significantly from the common stacked heat sink fin in shape and forming process, therefore, a forming mold structure and forming process specifically designed for the Z-shaped heat sink fin is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a mold structure for forming a Z-shaped heat sink and a method for forming a Z-shaped heat sink.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to provide a U-shaped heat dissipation fin forming mold structure, which includes a continuous forward and reverse bending mold and a stamping and puncturing mold; the stamping and puncturing mold is disposed on one side of the continuous forward and reverse bending mold;

[0005] The continuous forward and reverse bending die includes a relatively openable upper die unit and a lower die unit;

[0006] The upper die unit includes a bending punch; the lower die unit includes a first forming insert and a positioning pin.

[0007] The first molded insert has a first positioning part with a protrusion for fixing the plate to be bent thereon;

[0008] The positioning pin is detachably mounted on the first forming insert and extends out relative to the first forming insert, forming a stamping and bending forming cavity between it and the first positioning part for bending the end of the plate to be bent; the bending punch is located directly above the stamping and bending forming cavity.

[0009] Preferably, the stamping puncture die includes a relatively openable upper die assembly and a lower die assembly;

[0010] The upper die assembly includes a piercing punch for piercing the surface of the bent portion of the plate to form a folded edge; the lower die assembly includes a second forming insert.

[0011] The second molded insert has a raised second positioning part that mates with the bent portion of the bent plate, and the piercing punch is positioned directly above the second positioning part;

[0012] Furthermore, the second positioning part is provided with a clearance hole for the piercing punch to extend into.

[0013] Preferably, a punching gap and a bending gap are formed between the piercing punch and the second positioning part;

[0014] The punching gap is equal to 0.05 times the thickness of the bent plate, and the second bending gap is equal to the thickness of the bent plate.

[0015] Preferably, the lower mold assembly further includes a lower mold base and at least one positioning element disposed on the lower mold base;

[0016] The second molding insert is detachably installed on the lower mold base, and its second positioning part is fixed in place with the curved part of the area to be punctured on the bent plate;

[0017] The shape of the positioning element corresponds to the shape of the bent plate, and it is fixed in place with the curved portion on the bent plate in the area other than the area to be punctured.

[0018] Preferably, the lower mold base is provided with multiple positioning slots, and a positioning component is detachably engaged with each of the multiple positioning slots.

[0019] Preferably, the first molding insert has a pin hole on its surface facing the upper mold unit, and the positioning pin is detachably inserted into the pin hole.

[0020] Preferably, the outer surface of the bending punch has a right angle and a rounded angle, with the right angle facing the first positioning part and the rounded angle facing the positioning pin;

[0021] And / or, a right angle and a rounded angle are formed on the outer surface of the first positioning part, with the right angle close to the bending punch and the rounded angle away from the bending punch.

[0022] Preferably, a first bending gap is formed between the bending punch and the first positioning part, and the first bending gap is equal to the thickness of the plate to be bent.

[0023] The present invention also provides a method for forming a Z-shaped heat sink fin, which adopts the Z-shaped heat sink fin forming mold structure described in any of the above claims, and the Z-shaped heat sink fin forming method includes the following steps:

[0024] Step S1: In the initial state, place one end of the plate to be bent on the first positioning part and position it by having its end edge abut against the side wall of the positioning pin.

[0025] Step S2: The bending punch moves down and extends into the stamping and bending forming cavity, and stamps the end of the plate to be bent to form the first bent edge, thus obtaining the first formed plate to be bent.

[0026] Step S3: Remove the positioning pin from the first forming insert, rotate the first forming plate to be bent horizontally by 180 degrees, and fix its first bending edge on the side wall of the first positioning part for positioning; move the bending punch down to press the plate to be bent to obtain the second forming plate to be bent.

[0027] Step S4: Reverse the relative front and back positions of the plate to be bent obtained in the previous step and fix it on the first positioning part; move the bending punch down to press the plate to be bent.

[0028] Step S5: Repeat step S4 multiple times to obtain the final bent plate with multiple continuous bow sections.

[0029] Step S6: Place the bent plate obtained in step S5 onto the stamping and piercing die, and start the stamping and piercing die to stamp and pierce the surface of the bent portion of the plate.

[0030] Preferably, the stamping puncture die includes a relatively openable upper die assembly and a lower die assembly;

[0031] The upper die assembly includes a piercing punch for piercing the surface of the bent portion of the plate to form a folded edge; the lower die assembly includes a second forming insert.

[0032] The second molded insert has a raised second positioning part that mates with the bent portion of the bent plate, and the piercing punch is positioned directly above the second positioning part;

[0033] Furthermore, the second positioning part is provided with a clearance hole for the piercing punch to extend into;

[0034] Step S6 includes: fixing one of the bent portions of the bent plate obtained in step S5 onto the second positioning part, activating the upper mold assembly, moving the piercing punch downward to pierce the bent portion of the bent plate, and extending it into the clearance hole to form a folded edge on the bent portion of the bent plate that folds into the clearance hole.

[0035] The present invention relates to a zigzag heat sink forming mold structure. A bending punch extends into the stamping and bending forming cavity to complete the end bending of the plate to be bent. The already formed bent edge on the plate to be bent is fixed on the first positioning part and then successively stamped and bent to achieve continuous forward and reverse bending of the plate. The bent plate is then placed on a stamping and piercing mold on one side to perform a stamping and piercing process, thus obtaining the zigzag heat sink. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0037] Figure 1 This is a front view of a continuous forward and reverse bending die for a zigzag heat dissipation fin forming die structure according to an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 Enlarged schematic diagram of part A;

[0039] Figure 3 This is a top view of a continuous forward and reverse bending die for a zigzag heat dissipation fin forming die structure according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of one process of the zigzag heat dissipation fin forming mold structure of the present invention used in a continuous forward and reverse bending process;

[0041] Figure 5 This is a schematic diagram of one process of the zigzag heat dissipation fin forming mold structure of the present invention used in a continuous forward and reverse bending process;

[0042] Figure 6 This is a schematic diagram of one process of the zigzag heat dissipation fin forming mold structure of the present invention used in a continuous forward and reverse bending process;

[0043] Figure 7 This is a schematic diagram of one process of the zigzag heat dissipation fin forming mold structure of the present invention used in a continuous forward and reverse bending process;

[0044] Figure 8 This is a schematic diagram of one process of the zigzag heat dissipation fin forming mold structure of the present invention used in a continuous forward and reverse bending process;

[0045] Figure 9 This is a front view of the stamping piercing mold of a zigzag heat dissipation fin forming mold structure according to an embodiment of the present invention;

[0046] Figure 10 yes Figure 9 An enlarged schematic diagram of part B;

[0047] Figure 11 yes Figure 10 Top view;

[0048] Figure 12 This is a top view of the stamping piercing mold of a zigzag heat dissipation fin forming mold structure according to an embodiment of the present invention;

[0049] Figure 13This is a top view of the stamping piercing mold of a zigzag heat dissipation fin forming mold structure according to an embodiment of the present invention;

[0050] Figure 14 This is a top view of the stamping piercing mold of a zigzag heat dissipation fin forming mold structure according to an embodiment of the present invention;

[0051] Figure 15 yes Figure 12-14 A longitudinal sectional view of the zigzag heat sink fins in any of the drawings. Detailed Implementation

[0052] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0053] The terms "first" and "second" are used only for the convenience of describing the technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0054] like Figure 1-14 As shown, an embodiment of the present invention provides a zigzag heat sink forming mold structure including a continuous forward and reverse bending mold and a stamping and piercing mold. The stamping and piercing mold is located on one side of the continuous forward and reverse bending mold. First, the plate to be bent 3 is placed on the continuous forward and reverse bending mold, and a continuous forward and reverse bending process is performed to obtain a bent plate 4; then, the bent plate 4 is placed on the stamping and piercing mold on one side, and a stamping and piercing process is performed to obtain the zigzag heat sink 7.

[0055] like Figure 1-3 As shown, a continuous forward and reverse bending die according to an embodiment of the present invention includes an upper die unit 1 and a lower die unit 2 that can be opened and closed relative to each other. The plate to be bent 3 is fixed on the lower die unit 2, and the upper die unit 1 moves downward relative to the lower die unit 2 and presses on the plate to be bent 3 to bend the plate to be bent.

[0056] The upper die unit 1 includes a bending punch 10. The lower die unit 2 includes a first forming insert 20 and a positioning pin 21.

[0057] A first positioning portion 201 is formed on the first molded insert 20 for fixing the bent plate 3 thereon. Figure 2 and Figure 3 From the two perspectives, it can be seen that the first positioning part 201 can be roughly strip-shaped or block-shaped.

[0058] The positioning pin 21 is detachably mounted on the first forming insert 20, located on one side of the first positioning part 201, and extends relative to the first forming insert 20, forming a stamping and bending forming cavity 203 between itself and the first positioning part 201. The stamping and bending forming cavity 203 is used to bend the end of the plate to be bent 3. The bending punch 10 is located directly above the stamping and bending forming cavity 203, and moves downward under the drive of the upper die unit 1 to stamp the plate to be bent 3 into a bent shape. Subsequently, the positioning pin 21 is removed to complete the subsequent bending steps.

[0059] That is, the end bending of the plate 3 to be bent can be completed by using the stamping and bending forming cavity 203 formed between the positioning pin 21 and the first positioning part 201. Then, the already formed bent edge on the plate 3 to be bent can be fixed on the first positioning part 201 for subsequent bending until the finally formed bent plate 4 is obtained.

[0060] Correspondingly, please refer to Figure 4-13 The method for forming a Z-shaped heat dissipation fin according to an embodiment of the present invention includes the following steps:

[0061] Step S1, as follows Figure 4 As shown, in the initial state, the plate to be bent 3 is a flat plate, with the end furthest from the mold controlled by the operator. The end of the plate to be bent 3 closest to the mold is placed on the first positioning part 201, and positioned by the edge of this end abutting against the side wall of the positioning pin 21.

[0062] Step S2: The bending punch 10 moves down and extends into the stamping and bending forming cavity 203, and stamps the end of the plate to be bent 3 to form the first bent edge, thus obtaining the first formed plate to be bent 3.

[0063] Step S3, as follows Figure 5 As shown, the positioning pin 21 is removed from the first forming insert 20, and the first-formed bending plate 3 obtained in step S2 is rotated horizontally by 180 degrees to fix its first bent edge to the side wall of the first positioning part 201 for positioning. Subsequently, the bending punch 10 moves down to form a second bent edge on the bending plate 3. The second bent edge and the first bent edge together form the first bow part 40, thus obtaining the second-formed bending plate 3.

[0064] Step S4: Reverse the relative front and back positions of the plate to be bent 3 obtained in the previous step and fix it on the first positioning part 201; the bending punch 10 moves down to punch the plate to be bent 3.

[0065] Step S5, and so on, repeat step S4 multiple times, such as... Figure 8 As shown, after continuous forward and reverse bending, a generally wavy bent plate 4 with continuous bow sections 40 can be obtained.

[0066] Specifically, the following provides the process of repeating step S4 twice:

[0067] Step S50: As Figure 6 As shown, the front and back positions of the second-formed plate 3 to be bent obtained in step S3 are reversed, or vertically rotated 180 degrees, and then its second bent edge is fixed to the side wall of the first positioning part 201 for positioning. Subsequently, the bending punch 10 moves down to form a third bent edge on the plate 3 to be bent. The third bent edge and the second bent edge together form the second bow part 40, thus obtaining the third-formed plate 3 to be bent.

[0068] Step S51: As Figure 7 As shown, the front and back positions of the third-formed plate 3 to be bent obtained in step S50 are reversed, or vertically rotated 180 degrees, and then its third bending edge is fixed to the side wall of the first positioning part 201 for positioning. Subsequently, the bending punch 10 moves down to form a fourth bending edge on the plate 3 to be bent. The fourth bending edge and the third bending edge together form the third bow part 40, thus obtaining the fourth-formed plate 3 to be bent.

[0069] Step S6: Place the bent plate 4 obtained in step S5 on the stamping and piercing die, and start the stamping and piercing die to stamp and pierce the surface of the bent plate 4 to obtain the Z-shaped heat dissipation fins 7.

[0070] It is important to note that "bent plate 4" and "plate to be bent 3" are relative concepts in this description. "Bent plate 4" specifically refers to the plate after continuous forward and reverse bending (see reference). Figure 8 The resulting sheet has a continuous and complete bow portion 40. "Sheet to be bent 3" refers to a sheet that is in a form other than "bent sheet 4" or that was not fully formed in other steps.

[0071] In this embodiment, both the "bent plate 4" and the "plate to be bent 3" are 0.5mm thick aluminum plates used to form the Z-shaped heat dissipation fins 7. In other embodiments, the "bent plate 4" and the "plate to be bent 3" can also be plates of other materials or thicknesses.

[0072] In particular, the continuous forward and reverse bending die of the present invention can also realize the continuous forward and reverse bending of other thin plates (especially thin plates less than 0.5mm). Because the plate is punched and bent successively on the continuous forward and reverse bending die, each punching forms a curved section 40, and each edge to be bent is subjected to uniform force. The continuous curved sections 40 after forming are uniform in shape and size and have a reliable structure.

[0073] Among them, such as Figure 1-3As shown, the first positioning part 201 can be a strip or block with a rectangular cross-section, and the curved part 40 formed on the plate to be bent 3 correspondingly has a U-shaped groove structure with three straight sides. Alternatively, in other embodiments, the first positioning part 201 can also be a strip or block with a trapezoidal or other shapes. The shapes of the first positioning part 201 and the bending punch 10 should correspond or be approximately the same. By appropriately adjusting the shape of the first positioning part 201 and / or the shape of the bending punch 10, different specific shapes of bent edges can be formed on the plate to be bent 3, thereby obtaining bent plates 4 with different specific shapes.

[0074] In the following description, it should be noted that the curved portion 40 on the bent plate 4 includes an upwardly convex curved portion and a downwardly convex curved portion. The space between alternating upwardly convex curved portions is the downwardly convex curved portion, and the space between alternating downwardly convex curved portions is the upwardly convex curved portion. That is, the upwardly convex curved portion and the downwardly convex curved portion are relative terms, and their definition is determined by the placement position of the bent plate 4 and the observer's viewing angle. In the same static state, from the same viewing angle, a bent plate 4 has opposing upwardly convex curved portions and downwardly convex curved portions. This description is only for the reader's convenience in understanding this technical solution and should not be construed as a limitation of this technical solution.

[0075] like Figure 9-14 As shown, in this embodiment, the stamping piercing die includes an upper die assembly 5 and a lower die assembly 6 that are relatively openable and closable. The upper die assembly 5 includes a piercing punch 50, which is used to pierce the upper surface of the upper convex curved portion of the bent plate 4 to form a folded edge 401. The lower die assembly 6 includes a second forming insert 60, on which an upwardly protruding second positioning portion 601 is formed to cooperate with the upper convex curved portion of the bent plate 4, and the piercing punch 50 is disposed directly above the second positioning portion 601.

[0076] The piercing punch 50 can move downward under the drive of the upper die assembly 5 and punch and pierce the surface of the upper convex bow portion of the bent plate 4 fixed on the second positioning part 601. For this purpose, the second positioning part 601 is provided with a clearance hole 602 for the piercing punch 50 to extend into.

[0077] Specifically, one of the bent portions 40 of the bent plate 4 obtained in step S5 can be fixed on the second positioning part 601. The upper mold assembly 5 is activated, and the piercing punch 50 moves down to pierce the upper convex bent portion of the bent plate 4 and extends into the avoidance hole 602, forming a folded edge 401 on the upper convex bent portion of the bent plate 4 that folds into the avoidance hole 602.

[0078] When performing the stamping and puncturing process, it can be done according to... Figure 9From right to left or left to right, puncture each of the upward convex curved sections on the bent plate 4 to complete the first puncture shaping. Then, reverse the bent plate 4 (understandably, this changes the placement position, thus altering the definitions of the upward and downward convex curved sections), and then proceed according to... Figure 9 The second piercing process is completed in either a right-to-left or left-to-right direction. As a result, two opposite-direction (upward and downward) folded edges 401 will be formed on the bent plate 4.

[0079] Furthermore, to improve processing efficiency and ease of operation, two identical stamping and puncturing dies can be set up, and the number of operators and the placement of the dies can be reasonably arranged to complete the two puncture forming processes in sequence.

[0080] In this technical field, the term "puncture" can also be referred to as stabbing or tearing.

[0081] In this embodiment, a punching gap e1 and a second bending gap e2 are formed between the piercing punch 50 and the second positioning part 601;

[0082] Considering that an excessively large blanking gap e1 may produce burrs on the bent plate 4, while an excessively small blanking gap e1 will increase the difficulty of material removal, after testing, the blanking gap e1 can be set to 0.05 times the thickness of the bent plate 4. At the same time, the second bending gap e2 is equal to the thickness of the bent plate 4, which can achieve a better puncture forming effect.

[0083] like Figure 12-14 As shown, in this embodiment, a bent plate 4 has three puncture forming areas. During processing, the bent plate 4 is moved along the length direction of the stamping puncture die, and stamping punctures can be performed sequentially on the three puncture forming areas. Therefore, when the bent plate 4 is relatively long, in order to further ensure its stability fixed on the lower die assembly 6:

[0084] The lower mold assembly 6 may also include a lower mold base 61 and at least one positioning element 62 disposed on the lower mold base 61. The second molding insert 60 is detachably mounted on the lower mold base 61, and the second positioning part 601 thereon is fixed in place with the convex bow part of the area to be punctured on the bent plate 4.

[0085] The shape of the positioning member 62 corresponds to the shape of the bent plate 4, and it is fixed in place to the convex bow portion on the bent plate 4 in the area other than the area to be punctured.

[0086] For example in Figure 12 In the diagram, the area to be pierced refers to the upper part of the bent plate 4 in the center. Figure 13 In the diagram, the area to be pierced refers to the middle section of the bent plate 4 in the image; Figure 12In the diagram, the area to be pierced refers to the lower part of the bent plate 4 in the center.

[0087] Furthermore, multiple positioning slots 63 can be formed on the lower mold base 61, and a positioning member 62 can be detachably engaged with multiple positioning slots 63 respectively. Thus, when the bent plate 4 is in different positions on the lower mold assembly 6, the positioning member 62 can be moved to correspondingly place and fix it in different positioning slots 63, thereby fixing the upwardly convex curved portion on the bent plate 4 in areas other than the area to be punctured. This reduces the number of positioning members 62, saving costs. Of course, in other embodiments, multiple positioning members 62 can also be simultaneously provided at different positions on the lower mold base 61.

[0088] For example in Figure 12 In the figure, the positioning element 62 can be placed on the lower part of the lower mold assembly 6 in the center position, and is located on the lower side of the second forming insert 60; Figure 13 In the figure, the positioning element 62 can be placed in the middle position on the lower mold assembly 6, and is located above the second forming insert 60; Figure 14 In the figure, the positioning element 62 can be placed on the upper part of the lower mold assembly 6 in the center position, and is located on the upper side of the second molding insert 60.

[0089] In this embodiment, the lower die assembly 6 further includes a second adjusting member 64, which is used to adjust the closing height of the upper die assembly 5 and the lower die assembly 6. When the upper die assembly 5 moves downward, it abuts against the second adjusting member 64 and stops at a suitable height position. By changing the height of the second adjusting member 64, the upper die assembly 5 can be moved down to a suitable height position to complete the stamping and piercing.

[0090] Please refer to the previous document. Figure 1-3 For continuous forward and reverse bending dies, in this embodiment, the first forming insert 20 has a pin hole 202 on its surface facing the upper die unit 1, and the positioning pin 21 is detachably inserted into the pin hole 202.

[0091] Before step S1, the positioning pin 21 can be inserted into the pin hole 202 for fixation, so that the part protruding relative to the first forming insert 20 can be used to position the plate 3 to be bent. In step S3, the positioning pin 21 can be pulled out from the pin hole 202 of the first forming insert 20, and then the pin hole 202 can be filled with a metal block or other object that can fill the pin hole 202.

[0092] The outer surface of the bending punch 10 has a right angle and a rounded corner. The right angle faces the first positioning part 201, and the rounded corner faces the positioning pin 21; or, the right angle is closer to the first positioning part 201 than the rounded corner. The right-angled portion of the bending punch 10 is used to punch the edge to be bent of the plate 3, and therefore is positioned close to or towards the first positioning part 201. The rounded corner portion of the bending punch 10 is used to avoid punching the non-bending edge of the plate 3, and therefore is positioned away from or away from the first positioning part 201, or towards the positioning pin 21.

[0093] Similarly, and / or the outer surface of the first positioning part 201 has a right angle and a rounded corner, with the right angle close to the bending punch 10 and the rounded corner away from the bending punch 10; or, in other words, the right angle is closer to the bending punch 10 than the rounded corner. The right angle portion is used to press the bent edge of the plate to be bent 3, and therefore is positioned close to or towards the bending punch 10. The rounded corner portion is used to fix the non-bent edge of the plate to be bent 3, or in other words, to fix the already bent edge on the plate to be bent 3, and therefore is positioned away from or away from the bending punch 10.

[0094] When both right angles and rounded angles are simultaneously set on the bending punch 10 and the first positioning part 201, the bending edge of the plate to be bent 3 is located between the right angle of the bending punch 10 and the right angle of the first positioning part 201 during the bending process, ensuring a reliable bending effect. At the same time, the non-bending edges on the plate to be bent 3 will not be subjected to excessive concentrated stress, ensuring that the shape of the curved portion 40 on the plate to be bent 3 is uniform.

[0095] A first bending gap w is formed between the bending punch 10 and the first positioning part 201. Further, in this embodiment, the first bending gap w is equal to the thickness of the plate 3 to be bent.

[0096] In this embodiment, the lower die unit 2 further includes a first adjusting member 22, which is used to adjust the closing height of the upper die unit 1 and the lower die unit 2. When the upper die unit 1 moves downward, it abuts against the first adjusting member 22 and stops at a suitable height position. By changing the height of the first adjusting member 22, the upper die unit 1 can be moved down to a suitable height position to complete the stamping.

[0097] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for forming a Z-shaped heat dissipation fin, characterized in that, The heat dissipation fin forming mold structure is adopted, which includes a continuous forward and reverse bending mold and a stamping and puncturing mold; the stamping and puncturing mold is located on one side of the continuous forward and reverse bending mold. The continuous forward and reverse bending die includes an upper die unit (1) and a lower die unit (2) that can be opened and closed. The upper die unit (1) includes a bending punch (10); the lower die unit (2) includes a first forming insert (20) and a positioning pin (21). The first molded insert (20) has a first positioning part (201) with a protrusion for fixing the plate (3) to be bent thereon. The positioning pin (21) is detachably mounted on the first forming insert (20) and extends relative to the first forming insert (20), forming a stamping bending forming cavity (203) between it and the first positioning part (201) for bending the end of the plate (3) to be bent; the bending punch (10) is located directly above the stamping bending forming cavity (203); The method for forming the Z-shaped heat sink includes the following steps: Step S1: In the initial state, place one end of the plate to be bent (3) on the first positioning part (201) and position it by abutting its end edge against the side wall of the positioning pin (21); Step S2: The bending punch (10) moves down and extends into the stamping and bending forming cavity (203) to stamp and form the first bent edge at the end of the plate to be bent (3) to obtain the first formed plate to be bent (3). Step S3: Remove the positioning pin (21) from the first forming insert (20), rotate the first forming plate to be bent (3) obtained in step S2 horizontally by 180 degrees, and fix its first bending edge on the side wall of the first positioning part (201) for positioning; move the bending punch (10) down to punch the plate to be bent (3) to obtain the second forming plate to be bent (3). Step S4: Reverse the relative front and back positions of the plate to be bent (3) obtained in the previous step and fix it on the first positioning part (201); the bending punch (10) moves down to punch the plate to be bent (3). Step S5: Repeat step S4 multiple times to obtain the final bent plate (4) with multiple continuous bow sections (40). Step S6: Place the bent plate (4) obtained in step S5 on the stamping and piercing die, and start the stamping and piercing die to stamp and pierce the surface of the bent part (40) of the bent plate (4).

2. The method for forming a Z-shaped heat dissipation fin according to claim 1, characterized in that, The stamping puncture die includes a relatively openable upper die assembly (5) and a lower die assembly (6). The upper die assembly (5) includes a piercing punch (50) for piercing the surface of the bent portion (40) of the bent plate (4) to form a fold (401); the lower die assembly (6) includes a second forming insert (60). The second molded insert (60) has a raised second positioning part (601) that cooperates with the bow part (40) of the bent plate (4), and the piercing punch (50) is located directly above the second positioning part (601); Furthermore, the second positioning part (601) is provided with a clearance hole (602) for the piercing punch (50) to extend into. Step S6 includes: fixing one of the bent portions (40) of the bent plate (4) obtained in step S5 onto the second positioning part (601), activating the upper mold assembly (5), moving the piercing punch (50) downward to pierce the bent portion (40) of the bent plate (4) and inserting it into the relief hole (602), forming a folded edge (401) that folds into the relief hole (602) on the bent portion (40) of the bent plate (4).

3. The method for forming a Z-shaped heat dissipation fin according to claim 2, characterized in that, A punching gap (e1) and a second bending gap (e2) are formed between the piercing punch (50) and the second positioning part (601). The punching gap (e1) is equal to 0.05 times the thickness of the bent plate (4), and the second bending gap (e2) is equal to the thickness of the bent plate (4).

4. The method for forming a Z-shaped heat dissipation fin according to claim 2, characterized in that, The lower mold assembly (6) further includes a lower mold base (61) and at least one positioning element (62) disposed on the lower mold base (61). The second molding insert (60) is detachably installed on the lower mold base (61), and the second positioning part (601) on it is fixed in conjunction with the bow part (40) of the area to be punctured on the bent plate (4); The shape of the positioning member (62) corresponds to the shape of the bent plate (4), and it is fixed in conjunction with the bow portion (40) on the bent plate (4) in the area other than the area to be punctured.

5. The method for forming a Z-shaped heat dissipation fin according to claim 4, characterized in that, The lower mold base (61) is provided with multiple positioning slots (63), and a positioning component (62) is detachably engaged with the multiple positioning slots (63).

6. The method for forming a Z-shaped heat dissipation fin according to any one of claims 1-5, characterized in that, The first molding insert (20) has a pin hole (202) on its surface facing the upper mold unit (1), and the positioning pin (21) is detachably inserted into the pin hole (202).

7. The method for forming a Z-shaped heat dissipation fin according to any one of claims 1-5, characterized in that, The outer surface of the bending punch (10) has a right angle and a rounded angle, with the right angle facing the first positioning part (201) and the rounded angle facing the positioning pin (21). And / or, a right angle and a rounded angle are formed on the outer surface of the first positioning part (201), with the right angle close to the bending punch (10) and the rounded angle away from the bending punch (10).

8. The method for forming a Z-shaped heat dissipation fin according to any one of claims 1-5, characterized in that, A first bending gap (w) is formed between the bending punch (10) and the first positioning part (201), and the first bending gap (w) is equal to the thickness of the plate (3) to be bent.

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