One-step extrusion-cutting preparation method and device for fins between grooves in two sides

Abstract

The invention discloses a one-step extrusion-cutting preparation method and device for fins between grooves in two sides. The device is composed of a main half die, an auxiliary half die, an upper extrusion block, a lower extrusion block, a stamping die and a taking-out mechanism, the upper extrusion block and the lower extrusion block are each provided with a groove-shaped forming cavity and an inter-groove fin forming area, and an input channel, a transverse channel and an output channel are formed after the main half die and the extrusion blocks are assembled. In the machining process, a stamping die pushes a workpiece to move downwards along an input channel under the action of an external load, and a workpiece material is sheared-shunted at a cutting edge of a lower extrusion block and enters a transverse channel under a constraint condition; and then the upper groove-shaped forming cavity, the lower groove-shaped forming cavity and the inter-groove area are sequentially filled with the material under the extrusion effect, and therefore inter-groove fin structures are formed on the upper side and the lower side of the workpiece at the same time. And after forming is completed, demolding of the extrusion block is achieved through the taking-out rod and the T-shaped taking-out rod. Cooperative forming of cutting, flow dividing, extruding and filling can be achieved in the single pressing process, symmetric or asymmetric fins between grooves in the two sides can be obtained, the structural integrity is high, the forming consistency is good, the method is suitable for rapid machining of various plastic metals, and fin structures of multiple specifications can be prepared by replacing the extruding blocks.

Description

Technical Field

[0001] This invention relates to the field of metal material plastic processing technology, and more specifically to a one-step extrusion-cutting method and apparatus for preparing double-sided grooved fins. Background Technology

[0002] In the field of metal plastic forming, structures with complex cross-sectional features such as grooves and fins are widely used in engineering applications such as heat exchange, enhanced heat transfer, improved fluid turbulence, and increased structural stiffness. Traditional methods for fabricating such structures mainly include machining, roll forming, and multi-station extrusion. Machining can produce precisely shaped fins or grooves, but it is a removal-type process with low material utilization and limited processing efficiency, and it is difficult to obtain uniformly sized double-sided structures on thin cross-sections. While roll forming or step extrusion processes have certain forming efficiency, they often encounter problems such as uneven contours, difficulty in deformation control, and the need for multiple processing passes when machining small grooves.

[0003] To achieve double-sided grooved or finned structures, some technical solutions employ extrusion with upper and lower dies to form the cross-section. However, traditional extrusion methods struggle to simultaneously achieve both cutting action and plastic flow control. When material is obstructed in localized areas, it can easily lead to incomplete fin filling, groove collapse, or uncontrollable material flow direction. Furthermore, existing die structures often feature a single groove cavity arrangement, and the material typically lacks a stable guiding mechanism when entering narrow forming cavities. This makes it difficult to form complex structures in a single operation, often requiring multiple processing steps or subsequent finishing operations, thereby reducing processing efficiency and increasing costs.

[0004] On the other hand, existing technologies lack a synergistic mechanism that can simultaneously achieve local cutting, lateral material flow, and precise filling of the groove cavity within a mold, particularly in the simultaneous forming of bilaterally symmetrical structures. When material flows within a confined space, a composite mold structure is needed that combines cutting edge action, plastic extrusion action, and forming cavity constraint to ensure that the material can fully fill the groove cavity and inter-groove area and stably form bilateral inter-groove fins. However, the disclosed technologies lack an extrusion-cutting synergistic preparation method and apparatus that can achieve one-time forming of bilateral inter-groove fins through a single pressing action. Summary of the Invention

[0005] This invention aims to propose an extrusion-cutting composite preparation method and apparatus capable of forming double-sided slotted fin structures in a single processing pass, thereby solving the problems of multiple forming steps, complex molds, difficulty in ensuring processing accuracy, and insufficient material flow control in existing technologies. By coupling cutting and extrusion forming within the same processing path, this invention achieves synchronous control of material flow direction, speed, and forming area, thus obtaining a double-sided slotted fin structure with continuous structure, stable fin shape, and consistent dimensions.

[0006] To achieve the objective of this invention, the present invention provides a device for preparing double-sided slotted fins, comprising a main half-die, a secondary half-die, an upper extrusion block, a lower extrusion block, a punch, a take-out bar, and a T-shaped take-out bar;

[0007] The secondary mold half is fixed to the main mold half by bolts and nuts;

[0008] The upper extrusion block, lower extrusion block, extraction rod, and T-shaped extraction rod are installed inside the main mold half. The extraction rod and the T-shaped extraction rod...

[0009] After the rod is installed, a portion of it extends outside the main mold half;

[0010] The die is used to withstand downward pressure during processing and to transmit the pressure so that the workpiece can move downward.

[0011] After the main die half is assembled with the upper extrusion block and the lower extrusion block, it forms an input channel, a transverse output channel, and an output channel, which are respectively used for...

[0012] It is used for placing workpieces to be processed, guiding the lateral flow of materials, and discharging excess materials.

[0013] As a preferred technical solution, the main half mold has an upper slot and a lower slot, which are used to install the upper extrusion block and the lower extrusion block, respectively.

[0014] The main mold half has an upper hole and a lower countersunk hole for installing the extraction rod and the T-shaped extraction rod; the main mold half has a accommodating...

[0015] Through holes for connecting bolts to securely connect with the sub-mold half.

[0016] As a preferred technical solution, the secondary half-mold is provided with a through hole corresponding to the main half-mold, which is used to accommodate bolts and fix the two half-molds together.

[0017] As a preferred technical solution, the bottom of the upper extrusion block is provided with multiple parallel upper side grooves forming cavities, and the adjacent upper side groove forming cavities constitute an upper side groove fin forming area; during the processing, the workpiece material fills the upper side groove forming cavities and its corresponding upper side groove fin forming area under the extrusion action, so that an upper groove fin structure is formed on one side of the workpiece; the shape, width and depth of the upper side groove forming cavities can be adjusted according to the forming requirements.

[0018] As a preferred technical solution, the lower extrusion block has a cutting edge and multiple parallel lower groove forming cavities, and adjacent lower groove forming cavities constitute a lower groove fin forming area; the cutting edge is used to generate a cutting action on the workpiece, so that the material enters the lower groove forming cavity of the lower extrusion block and its corresponding lower groove fin forming area, forming a groove fin structure on the other side of the workpiece; the geometric parameters of the cutting edge and the lower groove forming cavity can be adjusted according to the forming requirements.

[0019] As a preferred technical solution, the extraction rod is cylindrical, and the T-shaped extraction rod has a T-shaped structure, which is used to eject the upper extrusion block and the lower extrusion block from the main half mold after processing.

[0020] As a preferred technical solution, the die has a multi-step structure, with a transition boss in the step transition section to reduce stress concentration during loading; a connecting rod area with a small width is provided in the middle of the die to reduce friction between the die and the input channel and reduce the overall weight of the die; an extrusion head is provided at the end of the die, which is used to apply extrusion force to the workpiece during the forming process.

[0021] The present invention provides a method for preparing a double-sided slotted fin, comprising the following steps:

[0022] Mold assembly: Install the upper extrusion block and lower extrusion block into the upper and lower slots respectively, and remove the extraction rod and T-shaped extraction rod.

[0023] Place them in the upper hole and the lower hole respectively; place the workpiece in the input channel and maintain the preset distance between it and the cutting edge; place the die tightly against the upper end of the workpiece in the input channel; after installation, fix the main half die and the auxiliary half die and place them on the test bench;

[0024] Material forming: Adjust the position of the device to ensure that the die is located in the center of the lower pressure head of the universal testing machine; after setting the pressing speed, start the universal testing machine so that the die moves downward and presses the workpiece downward; the workpiece material is first subjected to extrusion and cutting action at the cutting edge, and some material separates from the workpiece matrix and enters the transverse channel, and under the action of extrusion force, it fills the slot forming cavity and the slot fin forming area in sequence, thereby forming a slot fin structure on both sides of the workpiece;

[0025] Forming and demolding: When the die is pressed down to the preset forming position, the pressing is stopped; the bolts are removed to separate the main half mold and the auxiliary half mold; the protruding parts of the take-out bar and the T-shaped take-out bar are knocked out from the main half mold from the other side to get the formed slot fin structure workpiece.

[0026] As a preferred technical solution, a lubricant is applied to the input channel before the workpiece is placed in order to reduce the frictional resistance of the workpiece during the extrusion process.

[0027] As a preferred technical solution, the die and the input channel, as well as the workpiece and the input channel, are fitted with dimensional clearance to ensure the stability and smoothness of the forming process.

[0028] As a preferred technical solution, the metal workpiece should be square with a moderate length. There are no restrictions on the type of material. Metals that can withstand large deformations, such as pure copper and pure aluminum, can be selected according to actual needs.

[0029] Compared with existing technologies, the beneficial effects of this invention are reflected in:

[0030] 1. This invention achieves synergistic effects of cutting, diverting, extruding, and filling within the same mold, enabling the inter-groove space on both sides to...

[0031] The fin structure can be formed simultaneously during a single pressing process, significantly reducing processing steps, improving processing efficiency and reducing cycle costs.

[0032] 2. By adopting a replaceable upper and lower extrusion block structure, the shape, width, depth and spacing of the groove forming cavity can be quickly adjusted according to different product requirements, thereby obtaining groove fin structures of various shapes and sizes, significantly improving the adaptability and configurability of the device.

[0033] 3. The present invention, through the spatial staggered arrangement of the upper and lower groove-shaped forming cavities, enables the fabrication of asymmetrical groove fin structures in a single forming process, meeting different structural design or functional requirements and expanding the applicability of the device in complex structure forming.

[0034] 4. The groove forming cavity of the present invention, through the combined constraint of extrusion force and lateral flow guidance, enables the material to fully fill the groove forming cavity and the fin forming area between the grooves, avoiding defects such as groove collapse and insufficient filling in traditional extrusion, resulting in high integrity and good stability of the formed structure, which is suitable for engineering and mass production.

[0035] 5. The device structure of the present invention adopts a modular design, and each extrusion block, die and take-out mechanism can be disassembled and replaced independently, so that the mold can be reused under different product specifications or different material conditions, effectively reducing production costs and improving the flexibility of industrial application.

[0036] 6. The device of the present invention has good material compatibility, is suitable for processing a variety of metal materials with good plasticity, can stably prepare double-sided slot fin structures, has a wide range of processing applications, and has high promotion value. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the device in an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of the device in operation according to an embodiment of the present invention.

[0039] Figure 3 This is a partially enlarged schematic diagram of the extrusion cutting area in an embodiment of the present invention.

[0040] Figure 4 This is the front view of the main half-model in an embodiment of the present invention.

[0041] Figure 5 This is a front view of the lower extrusion block in an embodiment of the present invention.

[0042] Figure 6 This is a side view of the lower extrusion block in an embodiment of the present invention.

[0043] Figure 7 This is a top view of the lower extrusion block in an embodiment of the present invention.

[0044] Figure 8 This is a front view of the upper extrusion block in an embodiment of the present invention.

[0045] Figure 9 This is a side view of the upper extrusion block in an embodiment of the present invention.

[0046] Figure 10 This is a top view of the upper extrusion block in an embodiment of the present invention.

[0047] Figure 11 This is a front view of the T-shaped extraction rod in an embodiment of the present invention.

[0048] Figure 12 This is a side view of the T-shaped extraction rod in an embodiment of the present invention.

[0049] Figure 13 This is a top view of the T-shaped extraction rod in an embodiment of the present invention.

[0050] Figure 14 This is a front view of the rod being removed in an embodiment of the present invention.

[0051] Figure 15 This is a side view of the rod being removed in an embodiment of the present invention.

[0052] Figure 16 This is a top view of the rod being removed in an embodiment of the present invention.

[0053] Figure 17 This is a schematic diagram of the punching die structure in an embodiment of the present invention.

[0054] Figure 18 This is the front view of the sub-half-model in an embodiment of the present invention.

[0055] Figure 19 This is a side view of the sub-half-mold in an embodiment of the present invention.

[0056] Figure 20 This is a top view of the sub-half-mold in an embodiment of the present invention.

[0057] Figure 21 This is a schematic diagram illustrating the manufacturing process of the double-sided slotted fins of the present invention.

[0058] The diagram shows: 10-Die, 11-Transition boss, 12-Connecting rod, 13-Extrusion head, 20-Secondary die half, 30-Upper extrusion block, 31-Upper side groove forming cavity, 40-Main die half, 41-Upper slot, 42-Upper hole, 43-Sunk hole, 44-Lower slot, 50-Removal bar, 60-T-shaped removal bar, 70-Lower extrusion block, 71-Cutting edge, 72-Lower side groove forming cavity, 101-Input channel, 102-Transverse channel, 103-Output channel, 110-Extrusion cutting area. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0060] Please see Figures 1 to 3 The apparatus for preparing double-sided slotted fins in this embodiment includes a main half-mold 40, a secondary half-mold 20, an upper extrusion block 30, a lower extrusion block 70, a punch 10, a take-out rod 50, and a T-shaped take-out rod 60. The secondary half-mold 20 is detachably connected to the main half-mold 40 by bolts and nuts; the main half-mold 40 is provided with through holes for accommodating connecting bolts, and the secondary half-mold 20 is provided with through holes corresponding to those of the main half-mold 40, so as to achieve reliable fixing of the two half-molds.

[0061] Please see Figures 4 to 10 The main die 40 is also provided with an upper slot 41 and a lower slot 44, which are used to install the upper extrusion block 30 and the lower extrusion block 70, respectively. After the upper extrusion block 30 and the lower extrusion block 70 are assembled, three channels are formed inside the device: an input channel 101, a transverse channel 102, and an output channel 103. The input channel 101 is connected to the transverse channel 102 and the output channel 103. The input channel 101 is used to place the workpiece, the transverse channel 102 is used to guide the flow of the extruded inter-groove fin material, and the output channel 103 is used to discharge excess material.

[0062] The die 10 has a multi-step structure, with a transition boss 11 at the step transition section to reduce stress concentration during loading. The middle part of the die 10 has a connecting rod area 12 with a small width to reduce friction between the die 10 and the input channel 101 and reduce the overall weight of the die 10. The end of the die 10 is provided with an extrusion head 13, which is used to apply extrusion force to the workpiece during the forming process, so that the workpiece moves downward along the input channel 101 and is formed under the combined action of the upper and lower extrusion blocks 30 and 70.

[0063] The main mold half 40 has an upper hole 42 corresponding to the position of the upper extrusion block 30, and a lower hole 43 corresponding to the positions of the lower extrusion block 70 and the output channel 103, for installing the extraction rod 50 and the T-shaped extraction rod 60, respectively. After assembly, the extraction rod 50 and the T-shaped extraction rod 60 both extend partially out of the main mold half 40, for ejecting the upper and lower extrusion blocks 30 and 70 from the main mold half 40 after forming.

[0064] In some embodiments of the present invention, the extraction rod 50 is cylindrical, and the T-shaped extraction rod 60 is T-shaped, the size and shape of which can be adjusted according to actual needs.

[0065] In some embodiments, the cross-sectional shape of the portion of the die 10 inserted into the channel is the same as that of the input channel 101, both being rectangular. For example, in one embodiment, the die 10 has a length of 70 mm, a width of 10 mm, and a thickness of 5 mm.

[0066] The bottom area of ​​the upper extrusion block 30, corresponding to the position of the transverse channel 102, has multiple parallel upper groove forming cavities 31, which together form an upper groove fin forming area. During the forming process, the workpiece material enters and fills the upper groove forming cavities 31 and the groove area under the extrusion action, thereby forming a groove fin structure on the upper surface of the workpiece. In some embodiments of the present invention, the upper groove fin forming area is composed of three identical rectangular groove forming cavities 31, each with a groove width of 0.1 mm, a groove length of 27 mm, and a groove spacing of 0.2 mm. The size and shape of the groove forming cavities 31 can be adjusted according to requirements, for example, they can be designed as square, trapezoidal, or other cross-sectional shapes.

[0067] The lower extrusion block 70 includes a cutting edge 71 for applying a shearing-extrusion action to the front end of the workpiece and a plurality of lower groove forming cavities 72 arranged in the transverse channel 102. The cutting edge 71 creates a shear band in the contact area of ​​the workpiece, causing part of the material to separate from the original cross-section; part flows to the output channel 103, and the other part is introduced into the transverse channel 102. The material flowing into the transverse channel 102 fills the lower groove forming cavities 72 and their inter-groove areas under the extrusion action, forming corresponding inter-groove fin structures on the lower surface of the workpiece. In some embodiments of the invention, the cutting edge 71 has a 1:4 bevel angle and a bevel length of 1.65 mm, and the bevel angle can be adjusted as needed. The geometric parameters of the lower groove forming cavities 72 are similar to those of the upper structure and can also be varied as needed.

[0068] In some embodiments of the present invention, the upper and lower side grooves forming cavities 31 and 72 can be designed as symmetrical structures, so that the groove fins on both sides of the workpiece are symmetrical; they can also be arranged as spatially staggered structures to obtain asymmetrical groove fins to meet the needs of differentiated design.

[0069] In some embodiments of the present invention, the input channel 101 has dimensions of 70 mm × 10.1 mm × 5.1 mm. The workpiece is made of pure aluminum and has dimensions of 50 mm × 10 mm × 5 mm. The transverse channel 102 has a thickness of 2 mm and a width of 10.1 mm; the output channel 103 has a thickness of 2.4 mm and a width of 10.1 mm. The inter-slot fins after material filling eventually flow into the transverse channel 102 region.

[0070] The centerlines of the input channel 101 and the output channel 103 are offset from each other to facilitate the formation of a shear band when the material comes into contact with the lower extrusion block 70. In some embodiments of the invention, please refer to... Figure 2 and Figure 3 As shown in the diagram, the center line of input channel 101 is located to the right of the center line of output channel 103.

[0071] In some embodiments of the present invention, a method for preparing double-sided slotted fins is also provided, such as... Figure 11 As shown, the steps are as follows:

[0072] Mold assembly: Install the upper extrusion block 30 and the lower extrusion block 70 into the corresponding upper slot 41 and lower slot 44 respectively;

[0073] Insert the extraction rod 50 and the T-shaped extraction rod 60 into the upper hole 42 and the lower hole 43 respectively; place the workpiece in the input channel 101 and adjust its preset distance from the cutting edge 71; place the punch 10 on the upper end of the workpiece; finally, fix the main and auxiliary half molds 40 and 20 and install them on the experimental table.

[0074] Material forming: When the die 10 pushes the workpiece downward, the front end of the workpiece first contacts the cutting edge 71 area of ​​the lower extrusion block 70.

[0075] The impact force is concentrated at the cutting edge 71, causing high pressure and shear stress in the material and forming a shear band along the cutting edge 71, resulting in partial separation of the material from the matrix. The separated material is guided by the extrusion force to the transverse channel 102 and enters a constrained plastic flow state. As the workpiece continues to be pressed down, the material at the leading edge of the transverse channel 102 contacts the grooved forming cavities 31 and 72 arranged within the upper and lower extrusion blocks 30 and 70. The flow cross-section is compressed, leading to an increase in local hydrostatic pressure. The material preferentially fills the bottom of the groove and climbs upwards along the groove wall, gradually replicating the geometric contours of the grooved forming cavities 31 and 72. The area between adjacent grooved forming cavities is under strong constraint; the material entering this area is squeezed and lifted, maintaining a convex shape, forming inter-groove fins. As the grooved forming cavities 31 and 72 are completely filled from the bottom to the sidewalls, excess material is discharged along the output channel 103, thus obtaining corresponding inter-groove fin structures on the upper and lower surfaces of the workpiece during a single pressing process.

[0076] Forming and demolding: After the grooves form cavities 31 and 72 and the area between the grooves are completely filled, the excess material is discharged along the output channel 103.

[0077] After the punch 10 reaches the predetermined position, the loading stops, the bolts are removed to separate the main and auxiliary half molds 40 and 20; the extraction bar 50 and T-shaped extraction bar 60 are knocked out from the mold from the other side, and the upper and lower extrusion blocks 30 and 70 are ejected from the mold, and the final formed slot fin structure workpiece is obtained.

[0078] In the foregoing embodiments of this invention, the one-step extrusion-cutting forming device for double-sided inter-slot fins has a compact structure and a clear fit, enabling stable use under different processing conditions and providing good assemblability and ease of maintenance. The forming method of this invention is highly efficient, enabling simultaneous cutting and flow division, plastic extrusion, and slot-forming cavity filling during a single pressing process. It fully utilizes the plastic flow characteristics of materials under confined conditions, allowing the material to sequentially undergo shear separation, lateral flow guidance, and confined slot filling, thereby simultaneously obtaining inter-slot fin structures with consistent or controllable shapes on both the upper and lower sides of the workpiece. By adjusting the structure of the slot-forming cavities of the upper and lower extrusion blocks, this invention can adapt to various fin cross-sectional shapes and multiple size specifications, exhibiting strong structural forming capabilities and high adaptability.

[0079] The extrusion-cutting co-forming mechanism employed in this invention enables the material to generate a stable flow path under localized high pressure and shearing, effectively avoiding defects such as groove collapse and incomplete filling in traditional extrusion processes. This results in a groove-fin structure with excellent geometric accuracy, forming consistency, and mechanical stability. Simultaneously, the modular design of the extrusion block, die, and removal mechanism facilitates easy die replacement, enabling rapid switching between multiple product categories and batch processing scenarios, thereby reducing overall processing costs.

[0080] The foregoing description of the embodiments of this invention is intended to enable those skilled in the art to understand and implement the invention. Those skilled in the art can make various modifications or equivalent substitutions to the structures or process parameters without departing from the spirit or basic concept of this invention; such modifications and variations will be obvious to those skilled in the art. Therefore, this invention is not limited to the illustrated embodiments, but should cover the broadest scope consistent with its principles and core concepts.

Claims

1. An apparatus for preparing double-sided slotted fins, characterized in that: It includes a main die (40), a secondary die (20), an upper extrusion block (30), a lower extrusion block (70), an extraction bar (50), a T-shaped extraction bar (60), and a punch (10); The upper extrusion block (30), lower extrusion block (70), extraction rod (50) and T-shaped extraction rod (60) are installed on the main half mold (40), wherein the ends of the extraction rod (50) and the T-shaped extraction rod (60) extend beyond the main half mold (40); The die (10) is used to withstand downward pressure during processing, so that the workpiece can move downward; The main half mold (40) is provided with a through hole for accommodating connecting bolts, and the secondary half mold (20) is provided with a through hole corresponding to the main half mold (40). The secondary half mold (20) is detachably connected to the main half mold (40) by bolts and nuts. The main half-mold (40) is also provided with an upper slot (41) and a lower slot (44), which are used to install the upper extrusion block (30) and the lower extrusion block (70), respectively. After the upper extrusion block (30) and the lower extrusion block (70) are assembled, three channels are formed inside the device, namely the input channel (101), the transverse channel (102) and the output channel (103). The input channel (101) is connected to the transverse channel (102) and the output channel (103). The input channel (101) is used to place the workpiece, the transverse channel (102) is used to guide the flow of the extruded inter-groove fin material, and the output channel (103) is used to discharge excess material.

2. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The die (10) has a multi-step structure, and a transition boss (11) is provided in the step transition part to reduce stress concentration during loading. A connecting rod area (12) is provided in the middle of the die (10) to reduce friction between the die (10) and the input channel (101) and reduce the overall weight of the die (10). An extrusion head (13) is provided at the end of the die (10). The extrusion head (13) is used to apply extrusion force to the workpiece during the forming process, so that the workpiece moves downward along the input channel (101) and is formed under the combined action of the upper extrusion block (30) and the lower extrusion block (70).

3. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The main half mold (40) has an upper hole (42) at the position corresponding to the upper extrusion block (30), and a lower hole (43) at the position corresponding to the lower extrusion block (70) and the output channel (103), which are used to install the extraction rod (50) and the T-shaped extraction rod (60), respectively.

4. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The bottom of the upper extrusion block (30) is provided with multiple parallel upper groove forming cavities (31), and the adjacent upper groove forming cavities (31) form an upper groove fin forming area; during the processing, the workpiece material fills the upper groove forming cavity (31) and its corresponding upper groove fin forming area under the extrusion action, so that an upper groove fin structure is formed on one side of the workpiece.

5. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The lower extrusion block (70) has a cutting edge (71) and multiple parallel lower groove forming cavities (72). The adjacent lower groove forming cavities (72) form a lower groove fin forming area. The cutting edge (71) is used to cut the workpiece, so that the material enters the lower groove forming (72) of the lower extrusion block (70) and its corresponding lower groove fin forming area to form the groove fin structure on the other side of the workpiece.

6. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The extraction rod (50) is cylindrical, and the T-shaped extraction rod (60) has a T-shaped structure, which is used to eject the upper extrusion block (30) and the lower extrusion block (70) from the main half mold (40) after processing.

7. The apparatus for preparing double-sided slotted fins according to claim 1, characterized in that: The center lines of the input channel (101) and the output channel (103) are offset from each other.

8. A method for preparing double-sided slotted fins, characterized in that... The preparation is achieved using the apparatus described in any one of claims 1-6; the preparation steps are as follows: S1 mold assembly Install the upper extrusion block (30) and the lower extrusion block (70) in the upper slot (41) and the lower slot (44) respectively. Place the extraction rod (50) and the T-shaped extraction rod (60) in the upper hole (42) and the lower countersunk hole (43) respectively. Place the workpiece in the input channel (101) and maintain a preset distance from the cutting edge (71). Place the punch (10) close to the upper end of the workpiece in the input channel (101). After installation, fix the main half mold (40) and the auxiliary half mold (20) and place them on the experimental table. S2 Material Forming Adjust the position of the device to ensure that the punch (10) is located at the center of the lower pressure head of the universal testing machine; after setting the pressing speed, start the universal testing machine so that the punch (10) moves downward and presses the workpiece downward; the workpiece material is first subjected to extrusion and cutting action at the cutting edge (71), and some material separates from the workpiece matrix and enters the transverse channel (102), and under the action of extrusion force, it is sequentially filled into the groove forming cavity (31, 72) and the groove fin forming area, thereby forming a groove fin structure on both sides of the workpiece; S3 Molding and Demolding When the die (10) is pressed down to the preset forming position, the pressing stops; the bolts are removed to separate the main half die (40) and the secondary half die (20). By striking the protruding parts of the extraction rod (50) and the T-shaped extraction rod (60) from the other side, the upper extrusion block (30) and the lower extrusion block (70) are ejected from the main half mold (40) to obtain the formed slot fin structure workpiece.

9. The method for preparing double-sided slotted fins according to claim 8, characterized in that: In step S1, during mold assembly, lubricant is applied to the input channel (101) before the workpiece is placed in, in order to reduce the frictional resistance of the workpiece during the extrusion process.

10. The method for preparing double-sided slotted fins according to claim 8, characterized in that: The die (10) and the input channel (101) are fitted with a clearance fit, as are the workpiece and the input channel (101), to ensure the stability and smoothness of the forming process.

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