A four-axis tooling fixture for milling heat-dissipating fins and a method of using the same

Abstract

The application discloses a four-axis tool clamp for milling radiating teeth and a use method thereof, which comprises a four-axis machine tool and a clamping mechanism located at the top of the four-axis machine tool, the four-axis machine tool comprises a bed body and a workbench connected with the bed body, a processing hole is formed in the top of the workbench, the clamping mechanism is arranged around the processing hole, and the clamping mechanism comprises a first pressing block installed on one side of the top of the workbench. The application is provided with a guard plate with a tooth hole, can position the radiator in all directions, is not prone to loosening during milling, guarantees the milling quality, reduces the risk of tool breakage, further utilizes the flat surface of the guard plate to guarantee the deviation of all tooth heights to be qualified and meet the use requirement, further adjusts the position of the radiator by rotating the workbench, enables aluminum chips to fall and be collected under the action of gravity, saves time and effort, and is favorable for batch processing and production of the radiator.

Description

Technical Field

[0001] This invention specifically relates to a four-axis tooling fixture for milling heat dissipation teeth and its usage method. Background Technology

[0002] Aluminum alloy radiators are heat dissipation devices made primarily of aluminum alloy. They are characterized by their attractive appearance, lightweight and electrical conductivity, high heat dissipation efficiency, and good energy-saving effect. They are widely used in industries such as machinery, automobiles, wind power generation, construction machinery, air compressors, railway locomotives, and home appliances. Currently, aluminum alloy radiator blanks are mostly formed by hot forging to improve production efficiency. However, the tooth surface height is uneven after forging, and aluminum is relatively soft, which makes milling teeth a significant challenge. To address this issue, existing tooling fixtures mainly use traditional three-jaw chucks or simple clamping plates for clamping, combined with large cutters / saw blades for milling. The working principle is: after rigidly clamping the workpiece, axial cutting is performed, thereby realizing the mass production of aluminum alloy radiators. However, traditional tooling fixtures are not secure in holding the radiator, and they are prone to wobbling when milling the heat sink teeth, resulting in poor milling quality and easy tool breakage. At the same time, since the radial force of traditional cutting is greater than or equal to 50N, when facing soft aluminum alloys, the final tooth height deviation will exceed 0.1mm, which cannot meet the processing requirement of less than 0.05mm. Furthermore, the aluminum chips and broken teeth generated during milling need to be cleaned manually, which is time-consuming and labor-intensive, and the processing cycle is longer, which cannot meet the needs of mass production of radiators.

[0003] Therefore, it is necessary to invent a four-axis tooling fixture for milling heat dissipation teeth and its usage method to solve the above problems. Summary of the Invention

[0004] (a) Purpose of the invention The purpose of this invention is to provide a four-axis tooling fixture for milling heat dissipation teeth and its usage method. By setting a guard plate with toothed holes, the heat dissipation teeth can be positioned in all directions when inserted into the toothed holes, resulting in high stability and preventing loosening during milling. This ensures milling quality while reducing the risk of tool breakage. Furthermore, the flat surface of the guard plate ensures that the height of the milled heat dissipation teeth is flush with the guard plate, guaranteeing that all tooth height deviations are within acceptable limits and meeting usage requirements. Additionally, by rotating the worktable to adjust the position of the heat dissipation teeth, aluminum chips and broken teeth can fall into an external collection box under gravity. The collection process is simple, convenient, time-saving, and labor-saving, which is beneficial for the mass production of heat dissipation teeth, thus solving the aforementioned shortcomings in the technology.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a four-axis tooling fixture for milling heat dissipation teeth, comprising a four-axis machine tool and a clamping mechanism located on the top of the four-axis machine tool; The four-axis machine tool includes a bed and a worktable connected to the bed. A machining hole is provided on the top of the worktable, and a clamping mechanism is disposed around the machining hole. The clamping mechanism includes: The first pressure block is installed on one side of the top of the workbench. A relief groove is provided on the bottom inner side of the first pressure block. Two locking posts are connected side by side to the bottom wall of the first pressure block at the relief groove. The second pressure block is installed on the other side of the top of the workbench. A clearance groove is also provided on the bottom inner side of the second pressure block. A locking frame is connected to the bottom wall of the second pressure block located in the clearance groove. A protective plate is positioned directly above the workbench, and its left and right sides are respectively connected to the bottom of the first pressure block and the second pressure block. The top of the protective plate has several tooth holes for inserting heat dissipation teeth. Four clamping cylinders are provided, all located at the bottom of the worktable. Each clamping cylinder has a pressure rod connected to its output end, which is used to press the radiator between the guard plate and the first and second pressure blocks.

[0006] Preferably, the clamping mechanism further includes an ejection assembly for ejecting the heat sink, the ejection assembly comprising: There are two ejector cylinders, located on the outside of the first and second pressure blocks respectively, and connected to the top of the worktable; Two T-shaped blocks are provided, which are respectively connected to the top of the first pressure block and the top of the second pressure block. A connecting rod is connected to the top of the T-shaped block, and a rotating plate is connected to the top of the connecting rod. The outer ends of the two rotating plates are respectively connected to the output ends of the two ejector cylinders. There are three ejector pins, one of which penetrates the first pressure block and the other two of which penetrate the second pressure block.

[0007] Preferably, the ejector pin penetrating the first pressure block is disposed between the two locking posts, and the bottom ends of the two ejector pins penetrating the second pressure block are both disposed downward through the locking frame.

[0008] Preferably, each ejector pin is connected to a limiting plate at its bottom and a limiting nut at its top, wherein the tops of the two ejector pins that pass through the second pressure block are also equipped with connecting plates.

[0009] Preferably, the guard plate is U-shaped, and the opening width of the guard plate gradually widens along the length of the workbench.

[0010] Preferably, the opening end of the guard plate is connected to the bottom of the two locking posts, and the corner end is connected to the bottom of the limiting block.

[0011] Preferably, each of the four clamping cylinders is provided with a rotating base at the connection point with the worktable, and each of the four clamping cylinders is connected to an adapter block at its output end.

[0012] Preferably, the output end of each of the compression cylinders is connected to the pressure rod via an adapter block, and the pressure rod is located on top of the adapter block.

[0013] Preferably, baffles are provided on the top of both the front and rear sides of the workbench.

[0014] A method for using a four-axis tooling fixture for milling heat dissipation teeth includes the following steps: S1. Placing the radiator: In the initial state of the four-axis machine tool, the pressure rod is located above the worktable, and there is no obstruction above the machining hole. At this time, the operator places the side of the radiator with the heat dissipation teeth facing down, so that each heat dissipation tooth passes down through the corresponding tooth hole until the side of the radiator with the heat dissipation teeth is in contact with the guard plate, and the two ends are in contact with the locking column and locking frame respectively. Start the rotating chassis to control the rotation of the clamping cylinder, and then rotate the adapter block to the top of the machining hole. Then, the output end of the clamping cylinder retracts inward, so that the adapter block drives the pressure rod to move downward, pressing the side of the radiator away from the heat dissipation teeth onto the guard plate, thus completing the placement and positioning of the radiator. S2. Milling the heat dissipation teeth: The operator starts the four-axis machine tool and rotates the bed control table 180 degrees. The heat dissipation teeth change from vertically downward to vertically upward. At this time, the part of the heat dissipation teeth that needs to be milled is exposed above the guard plate. The external milling cutter gradually mills along the contour of the top of the guard plate, and then the exposed heat dissipation teeth are cut off, ensuring that the height of all heat dissipation teeth is flush with the top of the guard plate. S3. Radiator Removal and Chip Removal: After milling, the worktable is reset by the bed, and the radiator is rotated to the bottom of the worktable again. The operator controls the clamping cylinder to extend its output end. Through the adapter block, the pressure rod is driven away from the side of the radiator with heat dissipation teeth. Then, the clamping cylinder is rotated and reset by rotating the chassis, so that the area above the machining hole is unobstructed again. At this time, the output end of the ejector cylinder extends, and the rotating plate rotates with the connecting rod as support, thereby applying upward pressure to the ejector pin at its end, forcing the ejector pin to move upward and lift the radiator. The operator directly removes the radiator after it is separated from the guard plate. During this process, the heat dissipation teeth chips that are milled off will fall downward into the external collection box under the action of gravity due to the 180-degree rotation of the worktable. That is, the chip removal is automatically completed at the same time as the radiator is removed. S4. Mass production of radiators: Repeat steps S1-S3 until all heat dissipation teeth are milled to achieve mass production of radiators.

[0015] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the present invention are: 1. This invention provides a protective plate with toothed holes to match the heat dissipation teeth on the radiator. When the radiator is placed on the protective plate, the heat dissipation teeth can be inserted into the toothed holes to position the radiator in all directions. This makes the radiator more stable after being pressed by the pressure rod, less prone to loosening, avoids the phenomenon of tool breakage, and improves the milling quality of the heat dissipation teeth. 2. This invention features a protective plate with toothed holes. When the radiator is pressed against the protective plate by the pressure rod, the heat dissipation teeth that need to be milled are exposed on the top of the protective plate. An external milling cutter gradually mills along the contour of the top of the protective plate. Since part of the heat dissipation teeth is located inside the toothed holes, they can be protected by the toothed holes. At the same time, with the help of the flat surface of the protective plate, the height of the milled heat dissipation teeth is flush with the protective plate. There will be no large milling error due to the soft material, ensuring that the deviation of the height of all teeth meets the usage requirements. 3. This invention clamps the radiator on the worktable, and the orientation of its heat dissipation teeth can be freely adjusted by rotating the worktable. That is, when the radiator is taken out and placed, the heat dissipation teeth are always vertically downward. In this way, after the radiator is milled, the broken aluminum chips will fall downward into the external collection box under the action of gravity. Thus, the chip removal is automatically completed at the same time as the radiator is taken out. The whole process is simple, convenient, time-saving and labor-saving, which is conducive to the mass production of radiators. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rotating plate of the present invention when it tends to be horizontal; Figure 3 This is a demonstration diagram of the rotating plate of the present invention after rotation. Figure 4 This is a cross-sectional view of the heat sink of the present invention after installation; Figure 5 This is an exploded view of the heat sink and protective plate of the present invention; Figure 6 This is a distribution diagram of the pressure rod and the clamping cylinder of the present invention; Figure 7 This is a schematic diagram of the connection structure of the first pressing block, the protective plate, and the second pressing block of the present invention; Figure 8 This is a schematic diagram of the first pressing block structure of the present invention; Figure 9 This is a perspective view of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Four-axis machine tool; 11. Bed; 12. Worktable; 13. Machining holes; 2 Clamping mechanism, 21 First pressure block, 22 Locking post, 23 Second pressure block, 24 Locking frame, 25 Guard plate, 26 Tooth hole, 27 Pressing cylinder, 28 Pressing rod, 4 Ejection assembly; 41 Ejector cylinder, 42 T-block, 43 Connecting rod, 44 Rotating plate, 45 Ejector pin, 46 Limiting plate, 47 Limiting nut, 48 Connecting plate; 3. Leaving groove, 5. Rotating chassis, 6. Adapter block, 7. Baffle. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This invention provides, for example Figure 1-9 The four-axis tooling fixture shown includes a four-axis machine tool 1 and a clamping mechanism 2 located on top of the four-axis machine tool 1. The four-axis machine tool 1 includes a bed 11 and a worktable 12 connected to the bed 11. A machining hole 13 is provided on the top of the worktable 12. A clamping mechanism 2 is disposed around the machining hole 13. The clamping mechanism 2 includes: The first pressing block 21 is installed on one side of the top of the workbench 12. A relief groove 3 is provided on the bottom inner side of the first pressing block 21. Two locking posts 22 are connected side by side on the bottom wall of the first pressing block 21 at the relief groove 3. The second pressing block 23 is installed on the other side of the top of the workbench 12. A clearance groove 3 is also provided on the bottom inner side of the second pressing block 23. A locking frame 24 is connected to the bottom wall of the second pressing block 23 located in the clearance groove 3. The protective plate 25 is located directly above the workbench 12, and its left and right sides are respectively connected to the bottom of the first pressure block 21 and the second pressure block 23. The top of the protective plate 25 is provided with a number of tooth holes 26 for inserting heat dissipation teeth. Four clamping cylinders 27 are provided, all located at the bottom of the workbench 12. Each clamping cylinder 27 has a pressure rod 28 connected to its output end, which is used to press the radiator between the guard plate 25 and the first pressure block 21 and the second pressure block 23. The clamping mechanism 2 further includes an ejection assembly 4 for ejecting the radiator. The ejection assembly 4 includes: two ejection cylinders 41, which are located outside the first pressure block 21 and the second pressure block 23 respectively and connected to the top of the worktable 12; two T-shaped blocks 42, which are connected to the top of the first pressure block 21 and the second pressure block 23 respectively. The top of the T-shaped block 42 is connected to a connecting rod 43, and the top of the connecting rod 43 is connected to a rotating plate 44. The outer ends of the two rotating plates 44 are respectively connected to the output ends of the two ejection cylinders 41; and three ejector pins 45, one of which penetrates the first pressure block 21 and the other two of which penetrate the second pressure block 23.

[0020] In one embodiment, the guard plate 25 is U-shaped, and the opening width of the guard plate 25 gradually widens along the length of the workbench 12. The opening end of the guard plate 25 is connected to the bottom of the two locking posts 22, and the corner end is connected to the bottom of the limiting block. It adapts to the shape of the radiator and can guide the tooth debris to slide down along the U-shaped opening, avoiding the accumulation of tooth debris and realizing the rapid discharge of tooth debris. The ejector pin 45 that penetrates the first pressure block 21 is set between the two locking posts 22. The bottom ends of the two ejector pins 45 that penetrate the second pressure block 23 are both set downward through the locking frame 24, adapting to the shape of the radiator, so that the end of the guard plate 25 at the U-shaped opening can be stably connected to the second pressure block 23.

[0021] In one embodiment, each ejector pin 45 is connected to a limiting plate 46 at its bottom and a limiting nut 47 at its top. The two ejector pins 45 that pass through the second pressure block 23 are also equipped with connecting plates 48, so that the ejector pins 45 can move freely up and down inside the first pressure block 21 or the second pressure block 23 under the action of gravity. This allows the ejector pins 45 to be exposed at the end of the rotating plate 44 in a longer portion due to the pressure of the heat sink when the heat sink is placed, laying the foundation for the subsequent rotation of the rotating plate 44 to apply pressure to the ejector pins 45.

[0022] In one embodiment, a rotating base 5 is provided at the connection between the four clamping cylinders 27 and the worktable 12. The output ends of the four clamping cylinders 27 are connected to a transition block 6. The output end of each clamping cylinder is connected to a pressure rod 28 through the transition block 6. The pressure rod 28 is located on the top of the transition block 6, so that the position of the pressure rod 28 is freely controllable, which facilitates the placement and removal of the radiator.

[0023] In one embodiment, baffles 7 are provided on the top of both the front and rear sides of the workbench 12 to limit the front and rear sides of the heat sink, making the heat sink more stable within the machining hole 13 and preventing it from shaking.

[0024] A method for using a four-axis tooling fixture for milling heat dissipation teeth includes the following steps: S1. Placing the radiator: In the initial state of the four-axis machine tool 1, the ejector assembly 4 is located below the worktable 12, the pressure rod 28 is located above the worktable 12, and there is no obstruction above the machining hole 13. At this time, the operator places the side of the radiator with the heat dissipation teeth facing down, so that each heat dissipation tooth passes down through the corresponding tooth hole 26 until the side of the radiator with the heat dissipation teeth is in contact with the guard plate 25, and the two ends are in contact with the locking column 22 and the locking frame 24 respectively. Start the rotating chassis 5 to control the pressure cylinder 27 to rotate, thereby rotating the adapter block 6 above the machining hole 13. Then, the output end of the pressure cylinder 27 retracts inward, so that the adapter block 6 drives the pressure rod 28 to move downward, pressing the side of the radiator away from the heat dissipation teeth onto the guard plate 25, thus completing the placement and positioning of the radiator. In step S1, the output end of the ejector cylinder 41 is in a retracted state, which makes the rotating plate 44 tend to be horizontal. The ejector pin 45 has a large vertical movement space. When the heat sink is placed downward into the machining hole 13, the side of the heat sink with heat dissipation teeth will press against each ejector pin 45, so that the end of each ejector pin 45 moves closer to the pressure rod 28, laying the foundation for the subsequent rotation of the pressure rod 28 to drive the ejector pin 45 to move. Furthermore, after the radiator is placed, the baffles 7 located on the front and rear sides of the worktable 12 can limit the front and rear sides of the radiator, making the radiator more stable in the machining hole 13 and preventing it from shaking, thereby improving the milling quality of the heat dissipation teeth. At the same time, the clamping cylinder 27 presses down with air pressure of 0.6-0.8MPa, preferably 0.7MPa, so that the pressure rod 28 can be tightly attached to the outer side of the radiator; S2. Milling the heat dissipation teeth: The operator starts the four-axis machine tool 1, and the bed 11 controls the worktable 12 to rotate 180 degrees. The heat dissipation teeth change from vertical downward to vertical upward. At this time, the part of the heat dissipation teeth that needs to be milled is exposed above the guard plate 25. The external milling cutter gradually mills along the contour of the top of the guard plate 25, and then the exposed heat dissipation teeth are cut off, ensuring that the height of all heat dissipation teeth is flush with the top of the guard plate 25. In step S2, the external milling cutter cuts the top of the heat dissipation teeth at a rotational speed of 12000 r / min and a feed rate of 0.1 mm. S3. Removal and chip removal of the radiator: After milling, the worktable 12 is reset by the bed 11, and the radiator is rotated to the bottom of the worktable 12 again. The operator controls the clamping cylinder 27 to extend its output end. Through the adapter block 6, the pressure rod 28 is driven away from the side of the radiator with heat dissipation teeth. Then, the clamping cylinder 27 is rotated and reset by rotating the chassis 5, so that the area above the machining hole 13 is unobstructed again. At this time, the output end of the ejector cylinder 41 extends, and the rotating plate 44 rotates with the connecting rod 43 as support, thereby applying upward pressure to the ejector pin 45 at its end, forcing the ejector pin 45 to move upward and lift the radiator. The operator directly removes the radiator after it is separated from the guard plate 25. During this process, the heat dissipation teeth chips that are milled off will fall downward into the external collection box under the action of gravity due to the 180-degree rotation of the worktable 12. That is, the chip removal is automatically completed at the same time as the radiator is removed. In step S3, the stroke of the clamping cylinder 27 is greater than 20mm, and the ejector pin 45 pushes the radiator upward by 5mm; S4. Mass production of radiators: Repeat steps S1-S3 until all heat dissipation teeth are milled to achieve mass production of radiators. In step S4, after processing 100 pieces continuously, an inspection is performed to verify whether the tooth height deviation is controlled within ±0.03mm, whether the tooth breakage and jamming rate is controlled within 1.2%, and whether the processing time for a single piece is controlled within 50 seconds, so that the milling of the heat dissipation teeth can fully meet the production requirements in terms of quality and quantity.

[0025] Implementation: In use, the initial state of the four-axis machine tool 1 is that the ejector assembly 4 is located below the worktable 12, and the pressure rod 28 is located above the worktable 12, as per the attached instruction manual. Figure 1 , 4 As shown in Figure 6, reference numeral 8 in the figure represents the heat sink; When milling the heat dissipation teeth of the radiator, the operator directly inserts the radiator with the heat dissipation teeth facing down through the corresponding tooth hole 26 until the side with the heat dissipation teeth is in contact with the protective plate 25, and the two ends are respectively in contact with the locking post 22 and the locking frame 24. At this time, the protective plate 25 clamps the side with the heat dissipation teeth, while the locking post 22 and the locking frame 24 clamp the left and right sides of the radiator respectively. Then, the rotating chassis 5 is started, which controls the clamping cylinder 27 to rotate, thereby rotating the adapter block 6 above the machining hole 13. Then, the output end of the clamping cylinder 27 controls the pressure rod 28 to press the side of the radiator away from the heat dissipation teeth onto the protective plate 25, thereby clamping the side away from the heat dissipation teeth. At this time, under the limit of the locking post 22, the locking frame 24, the tooth hole 26, the protective plate 25, and the pressure rod 28, the radiator is difficult to shake or shift, and has high stability. It can effectively prevent the milling cutter from being damaged due to the shaking of the radiator, thus completing the placement and positioning of the radiator. Then, the worktable 12 rotates 180 degrees, and the heat dissipation teeth change from vertically downward to vertically upward. At this time, the external milling cutter gradually mills the heat dissipation teeth exposed above the guard plate 25 along the contour of the top of the guard plate 25. With the help of the flatness of the surface of the guard plate 25, it is ensured that the height of all heat dissipation teeth is flush with the top of the guard plate 25, and the tooth height deviation is less than 0.05mm. At the same time, after the milling is completed, the worktable 12 drives the radiator, and the pressure rod 28 moves away from the side of the radiator with heat dissipation teeth. Under the action of the ejector cylinder 41, the ejector pin 45 is forced to move upward to lift the radiator. At this time, the two ejector pins 45 located at the U-shaped opening move upward synchronously, which can apply force to the two ends of the radiator. With the ejector pin 45 at the U-shaped corner moving upward, the radiator can be subjected to force at three points at the same time, and move upward smoothly without jamming. Finally, the staff directly removes the radiator after it is separated from the protective plate 25. During this process, the radiator teeth debris that has been milled off will fall into the external collection box under the action of gravity due to the 180-degree rotation of the worktable 12. That is, the debris is automatically cleaned up at the same time as the radiator is removed. The whole process is simple, convenient, time-saving and labor-saving, which is conducive to the mass production of radiators. The horizontal rotation of the rotating chassis is achieved by roller bearings, a rotary support, a manual worm gear drive, or a servo motor drive. It will not be described in detail here. That is, the rotating chassis is not specifically described. Those skilled in the art can fully understand the specific implementation scheme of the rotating chassis to achieve the horizontal rotation of the clamping cylinder 27. Therefore, for the sake of space and to avoid redundancy, the specific detailed description of the rotating chassis is omitted and only mentioned in terms of functional limitation. This implementation method specifically addresses the problems of traditional tooling fixtures in the prior art, which are not secure in holding the heat sink, easily causing wobbling during milling of the heat sink teeth, resulting in poor milling quality and easy tool breakage. Furthermore, because the radial force of traditional cutting is greater than or equal to 50N, when dealing with relatively soft aluminum alloys, the final tooth height deviation will exceed 0.1mm, failing to meet the processing requirement of less than 0.05mm. Moreover, the aluminum chips and broken teeth generated during milling require manual cleaning, which is time-consuming, labor-intensive, and prolongs the processing cycle, failing to meet the needs of mass production of heat sinks.

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used above are only some embodiments described in this invention. Obviously, those skilled in the art can obtain other drawings based on these drawings.

[0027] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A four-axis tooling fixture for milling heat dissipation teeth, characterized in that: Includes a four-axis machine tool (1) and a clamping mechanism (2) located on top of the four-axis machine tool (1); The four-axis machine tool (1) includes a bed (11) and a worktable (12) connected to the bed (11). A machining hole (13) is provided on the top of the worktable (12). The clamping mechanism (2) is arranged around the machining hole (13). The clamping mechanism (2) includes: The first pressure block (21) is installed on one side of the top of the workbench (12). A relief groove (3) is provided on the bottom of the inner side of the first pressure block (21). Two locking posts (22) are connected side by side on the bottom wall of the first pressure block (21) at the relief groove (3). The second pressure block (23) is installed on the other side of the top of the workbench (12). The bottom of the inner side of the second pressure block (23) is also provided with a relief groove (3). The bottom wall of the second pressure block (23) located in the relief groove (3) is connected to a locking frame (24). The guard plate (25) is located directly above the workbench (12), and its left and right sides are connected to the bottom of the first pressure block (21) and the second pressure block (23) respectively. The top of the guard plate (25) has several tooth holes (26) for inserting heat dissipation teeth. Four clamping cylinders (27) are provided, all located at the bottom of the workbench (12). Each clamping cylinder (27) has a pressure rod (28) connected to its output end, which is used to press the radiator between the guard plate (25) and the first pressure block (21) and the second pressure block (23). The clamping mechanism (2) further includes an ejection assembly (4) for ejecting the heat sink, the ejection assembly (4) comprising: There are two ejector cylinders (41), which are located on the outside of the first pressure block (21) and the second pressure block (23) respectively, and are connected to the top of the worktable (12); Two T-shaped blocks (42) are provided, which are respectively connected to the top of the first pressure block (21) and the second pressure block (23). A connecting rod (43) is connected to the top of the T-shaped block (42), and a rotating plate (44) is connected to the top of the connecting rod (43). The outer ends of the two rotating plates (44) are respectively connected to the output ends of the two ejector cylinders (41). Three ejector pins (45) are provided, one of which is set through the first pressure block (21), and the other two ejector pins (45) are set through the second pressure block (23).

2. The four-axis tooling fixture for milling heat dissipation teeth according to claim 1, characterized in that: The ejector pin (45) that penetrates the first pressure block (21) is located between the two locking posts (22), and the bottom ends of the two ejector pins (45) that penetrate the second pressure block (23) both penetrate downward through the locking frame (24).

3. The four-axis tooling fixture for milling heat dissipation teeth according to claim 2, characterized in that: Each of the ejector pins (45) is connected to a limiting plate (46) at its bottom and to a limiting nut (47) at its top. The two ejector pins (45) that pass through the second pressure block (23) are also equipped with connecting plates (48) at their tops.

4. The four-axis tooling fixture for milling heat dissipation teeth according to claim 1, characterized in that: The guard plate (25) is U-shaped, and the opening width of the guard plate (25) gradually widens along the length direction of the workbench (12).

5. A four-axis tooling fixture for milling heat dissipation teeth according to claim 4, characterized in that: The opening end of the guard plate (25) is connected to the bottom of the two locking posts (22), and the corner end is connected to the bottom of the limiting block.

6. A four-axis tooling fixture for milling heat dissipation teeth according to claim 1, characterized in that: A rotating base (5) is provided at the connection between the four clamping cylinders (27) and the worktable (12), and an adapter block (6) is connected to the output end of the four clamping cylinders (27).

7. A four-axis tooling fixture for milling heat dissipation teeth according to claim 6, characterized in that: Each of the clamping cylinder output ends is connected to the pressure rod (28) via an adapter block (6), and the pressure rod (28) is located on top of the adapter block (6).

8. A four-axis tooling fixture for milling heat dissipation teeth according to claim 1, characterized in that: The workbench (12) is equipped with baffles (7) on both the front and rear top sides.

9. A method of using a four-axis tooling fixture for milling heat dissipation teeth as described in claim 6, characterized in that: Includes the following steps: S1. Placing the radiator: The initial state of the four-axis machine tool (1) is that the pressure rod (28) is above the worktable (12) and there is no obstruction above the machining hole (13). At this time, the worker places the side of the radiator with heat dissipation teeth facing down, so that each heat dissipation tooth passes through the corresponding tooth hole (26) downwards until the side of the radiator with heat dissipation teeth is in contact with the guard plate (25), and the two ends are in contact with the locking column (22) and the locking frame (24) respectively. Start the rotating chassis (5) to control the pressure cylinder (27) to rotate, and then rotate the adapter block (6) to the top of the machining hole (13). Then the output end of the pressure cylinder (27) retracts inward, so that the adapter block (6) drives the pressure rod (28) to move downwards, pressing the side of the radiator away from the heat dissipation teeth onto the guard plate (25), thus completing the placement and positioning of the radiator. S2, Milling the heat dissipation teeth: The operator starts the four-axis machine tool (1) and makes the bed (11) control the worktable (12) to rotate 180 degrees. The heat dissipation teeth change from vertical downward direction to vertical upward direction. At this time, the part of the heat dissipation teeth that needs to be milled is exposed above the guard plate (25). The external milling cutter gradually mills along the contour of the top of the guard plate (25) to cut off the exposed heat dissipation teeth, ensuring that the height of all heat dissipation teeth is flush with the top of the guard plate (25). S3. Removal and chip removal of the radiator: After milling, the worktable (12) is reset by the bed (11), and the radiator is rotated to the bottom of the worktable (12) again. The operator controls the clamping cylinder (27) to extend its output end, and drives the pressure rod (28) away from the side of the radiator with heat dissipation teeth through the adapter block (6). Then, the clamping cylinder (27) is rotated and reset by rotating the chassis (5), so that the area above the machining hole (13) is unobstructed again. At this time, the ejector cylinder (4) is ejected. 1) The output end extends out, and the rotating plate (44) rotates with the connecting rod (43) as support, thereby applying upward pressure to the ejector pin (45) at its end, forcing the ejector pin (45) to move upward and lift the heat sink. The staff can directly take out the heat sink after it is separated from the guard plate (25). During this process, the heat sink tooth debris that is milled off will fall downward into the external collection box under the action of gravity due to the 180-degree rotation of the worktable (12). That is, the debris is automatically cleaned up at the same time as the heat sink is taken out. S4. Mass production of radiators: Repeat steps S1-S3 until all heat dissipation teeth are milled to achieve mass production of radiators.

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