Extrusion die with high heat dissipation performance

Abstract

The utility model discloses an extrusion die of high heat dissipation performance, including upper die and lower die, upper die has the inlet, and the lower die is located the discharge side of upper die, and the lower die has the die hole, and the die hole work area of die hole is the back empty cutter of discharge side, and the lower die is distributed with a plurality of lower die heat dissipation through -hole in the lower die outside circumference, and lower die heat dissipation through -hole is from the inlet side of lower die to the discharge side of lower die and penetrates, and the upper die is distributed with a plurality of upper die heat dissipation blind hole in the inlet outside circumference, and upper die heat dissipation blind hole extends from the discharge side of upper die to the inlet of upper die, and upper die heat dissipation blind hole and lower die heat dissipation through -hole one -to -one and intercommunication, and still be provided with radial heat dissipation channel on the lower die, and radial heat dissipation channel is from the lower die outside surface to the inside surface of back empty cutter and penetrates, and radial heat dissipation channel and lower die heat dissipation through -hole are through. The scheme can quickly transfer, heat dissipation the heat generated by extrusion friction, increase the stability of die, and significantly improve the service life of die.

Description

Technical Field

[0001] This utility model belongs to the field of profile extrusion die technology, specifically relating to an extrusion die with high heat dissipation performance. Background Technology

[0002] The basic principle of profile extrusion production is that raw materials are formed into a specific cross-sectional shape through an extrusion die. During this process, friction between the raw material and the die generates heat. After continuously extruding multiple raw material bars, the die is prone to deformation due to heat, requiring repair, scrapping, or replacement. For example, a small existing extrusion die deforms after extruding approximately 100 aluminum bars, exhibiting poor stability and a short service life. Furthermore, to improve production efficiency, the extrusion speed needs to be increased accordingly. However, higher extrusion speeds lead to a faster increase in heat generated by friction, which has a more significant impact on the die. Therefore, a new solution is needed to rapidly dissipate heat from the extrusion die. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an extrusion die with high heat dissipation performance, which solves the problems of existing extrusion dies being prone to deformation due to heat, poor stability, and short service life. It enables the rapid transfer and dissipation of heat generated by extrusion friction, thereby increasing the amount of profile produced by continuous extrusion and the extrusion speed, improving efficiency, and reducing the cost of frequent die replacement.

[0004] According to the technical solution of this utility model, this utility model provides an extrusion die with high heat dissipation performance, including an upper die and a lower die. The upper die has a feed port, and the lower die is located on the discharge side of the upper die. The lower die has a die hole, and the discharge side of the die hole working zone is a rear blanking. The lower die has multiple heat dissipation through holes distributed circumferentially outside the die hole, which extend from the feed side of the lower die to the discharge side of the lower die. The upper die has multiple heat dissipation blind holes distributed circumferentially outside the feed port, which extend from the discharge side of the upper die to the feed side of the upper die. The heat dissipation blind holes of the upper die correspond one-to-one with the heat dissipation through holes of the lower die and are connected. The lower die is also provided with a radial heat dissipation channel, which extends from the outer side of the lower die to the inner side of the rear blanking and is connected to the heat dissipation through holes of the lower die.

[0005] In some embodiments, the radial heat dissipation channels include two sets distributed in the direction from the feed side to the discharge side.

[0006] In some embodiments, the radial heat dissipation channel includes a first radial heat dissipation channel and a second heat dissipation channel; a mold pad is provided on the discharge side of the lower die; the first radial heat dissipation channel is located near the working zone of the mold hole of the rear cutter; a radial heat dissipation groove is opened on the discharge side of the lower die, and the radial heat dissipation groove and the inlet side of the mold pad form the second heat dissipation channel.

[0007] In some embodiments, the rear cutter includes a primary rear cutter, a secondary rear cutter, and a tertiary rear cutter; the die working zone, the primary rear cutter, the secondary rear cutter, and the tertiary rear cutter are sequentially adjacent in the direction from feed to discharge and their shapes increase sequentially; the inner end of the first radial heat dissipation channel is located at the step formed between the primary rear cutter and the secondary rear cutter.

[0008] In some embodiments, the feed side of the lower die has a recessed welding chamber, the shape of which is larger than the die hole; the heat dissipation through-hole of the lower die is located outside the welding chamber.

[0009] In some embodiments, the heat dissipation through holes in the lower mold, the heat dissipation blind holes in the upper mold, and the radial heat dissipation channels are all straight lines. The heat dissipation through holes in the lower mold intersect perpendicularly with the radial heat dissipation channels, and the radial heat dissipation channels are parallel to the material discharge side of the lower mold.

[0010] In some embodiments, the heat dissipation through holes in the lower mold and the heat dissipation blind holes in the upper mold are four or more evenly distributed in the circumferential direction; the extension line of each radial heat dissipation channel passes through the central axis of the lower mold.

[0011] In some embodiments, a flow divider bridge is provided in the feed inlet of the upper mold, which divides the feed inlet into multiple flow dividers; the cross-sectional shape of the flow divider bridge is narrower in the middle on the feed side and the discharge side, and the feed side of the flow divider bridge forms a smooth guide surface that gradually slopes towards both sides of the flow divider bridge.

[0012] In some embodiments, the heat dissipation blind hole of the upper mold ends at 1 / 4 to 3 / 4 of the thickness of the upper mold; the discharge side of the diversion bridge gradually narrows relative to the middle to form the discharge section of the diversion bridge, and the length and position of the heat dissipation blind hole of the upper mold correspond to the discharge section of the diversion bridge.

[0013] In some embodiments, a flow divider bridge is provided in the inlet of the upper mold, which divides the inlet into multiple flow dividers; the outlet side of the flow divider bridge has a protruding mold core, and a mold core heat dissipation blind hole extending toward the inlet side is provided in the middle of the outlet side of the mold core.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows: 1. The high heat dissipation performance extrusion die of this utility model is based on the characteristic of frictional heat generation of the extruded raw material in the upper and lower dies. It is provided with interconnected upper die heat dissipation blind holes and lower die heat dissipation through holes to form an axial heat dissipation channel. The generated heat can be quickly discharged from the upper die to the lower die through this structure. Furthermore, the radial heat dissipation channel is connected to the axial heat dissipation channel opened in the lower die, thereby dissipating the heat inside the die to the outside of the die and increasing the stability of the die. There are multiple radial and axial heat dissipation channels, which form heat dissipation channels that can cover the XYZ three directions of space, achieving high heat dissipation efficiency. At the same time, the existence of these heat dissipation channels will not have a negative impact on the overall structural strength and forming effect of the extrusion die.

[0015] 2. The high heat dissipation performance extrusion die of this utility model is further preferably made of a shuttle-shaped flow divider bridge. The flow divider bridge has a narrow knife edge on the feed side, which completely eliminates dead corners, significantly reduces resistance, speeds up the feeding speed, and improves efficiency. Because the feeding speed of this structure is fast, the heat of the die also increases quickly. Combined with the rapid heat dissipation effect of the heat dissipation channel structure of this utility model, production efficiency can be greatly improved while ensuring the service life of the die.

[0016] 3. According to the test, for small extrusion dies that produce the same type of material, existing extrusion dies will deform due to heat after extruding about 100 aluminum bars. However, the extrusion die using the preferred solution of this utility model can extrude about 1200 aluminum bars with a total weight of about 20t in one go. For small dies, its service life is extremely long and the improvement effect is more than 10 times, which is a major breakthrough of the existing technology. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of an extrusion die provided by this utility model.

[0018] Figure 2 This is a structural schematic diagram of the upper die infeed side of an extrusion die provided by this utility model.

[0019] Figure 3 This is a structural schematic diagram of the lower die discharge side of an extrusion die provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the cross-sectional shape of a profile produced by an extrusion die provided by this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Upper mold; 11. Upper mold heat dissipation blind hole; 12. Flow divider bridge; 13. Flow divider hole; 14. Mold core; 15. Mold core heat dissipation blind hole; 16. Process hole; 2. Lower mold; 21. Mold hole; 22. Mold hole working zone; 23. Rear cutter; 231. First-stage rear cutter; 232. Second-stage rear cutter; 233. Third-stage rear cutter; 24. Lower mold heat dissipation through hole; 25. Radial heat dissipation channel; 251. First radial heat dissipation channel; 252. Radial heat dissipation groove; 26. Welding chamber; 3. Mold pad; 31. Mold pad discharge port. Detailed Implementation

[0022] This invention provides an extrusion die with high heat dissipation performance, which solves the problems of existing extrusion dies being prone to deformation due to heat, poor stability, and short service life. It enables the rapid transfer and dissipation of heat generated by extrusion friction, increases die stability, significantly improves die service life, and thus increases the amount of profile produced by continuous extrusion and the extrusion speed, improves efficiency, and reduces the cost of frequent die replacement.

[0023] Please see Figures 1 to 3 This utility model discloses an extrusion die with high heat dissipation performance, comprising an upper die 1 and a lower die 2. The upper die 1 has a feed inlet, and the lower die 2 is located on the discharge side of the upper die 1. The lower die 2 has a die hole 21, and the discharge side of the die hole working band 22 of the die hole 21 is a rear air cutter 23. Raw material bars are extruded from the feed side of the upper die 1 into the feed inlet, which communicates with the die hole 21. The die hole working band 22 is used to restrict the shape of the extruded material. (See also...) Figure 4 The contour of the die working strip 22 is consistent with the outer contour of the profile to be produced; for example, Figure 4 The profile shown has a cavity (the rectangular part in the figure), and correspondingly, a die core 14 is required in the upper die 1. During extrusion, the die core 14 is located inside the die hole 21. The outer side of the end or near the end of the die core 14 is the die core working strip, and the position of the die core working strip corresponds to the die hole working strip 22. The die core working strip is consistent with the inner contour of the profile (i.e., the cavity contour). The rear cutter 23 is the part that gradually expands outward from the discharge side of the die hole 21, thereby preventing the extruded profile from being scratched by the die. Optionally, a die pad 3 is also provided. The above are the basic structures and principles of existing extrusion dies (such as flow-dividing combination dies). Other similar methods can also be used, which will not be elaborated here.

[0024] The main innovation of this utility model is as follows: the lower mold 2 has a plurality of lower mold heat dissipation through holes 24 distributed circumferentially outside the mold hole 21, and the lower mold heat dissipation through holes 24 extend from the material inlet side of the lower mold 2 to the material outlet side of the lower mold 2; the upper mold 1 has a plurality of upper mold heat dissipation blind holes 11 distributed circumferentially outside the material inlet, and the upper mold heat dissipation blind holes 11 extend from the material outlet side of the upper mold 1 to the material inlet side of the upper mold 1, and the upper mold heat dissipation blind holes 11 correspond one-to-one with the lower mold heat dissipation through holes 24 and are connected; the lower mold 2 is also provided with a radial heat dissipation channel 25, which extends from the outer side of the lower mold 2 to the inner side of the rear cutter 23, and the radial heat dissipation channel 25 is connected to the lower mold heat dissipation through holes 24.

[0025] In this design, a set of corresponding lower die heat dissipation through holes 24 and upper die heat dissipation blind holes 11 are connected to form an axial heat dissipation channel, resulting in multiple circumferentially distributed channels. These axial heat dissipation channels surround the area where the raw material and profile move, and are closed on the upper die 1 feed side, not connected to the outside, thus not affecting the extrusion process and preventing the raw material from entering the axial heat dissipation channels. Radial heat dissipation channels 25 traverse the axial heat dissipation channels, forming a crisscrossing heat dissipation channel system that can efficiently exhaust and dissipate heat. It should be noted that "axial," "radial," and "circumferential" can be interpreted broadly. The preferred embodiment shown in the figure is strictly axial, radial, and circumferential, but in practice, they can be slightly offset (close to the strict meaning of axial, radial, and circumferential). For example, the positions of the multiple upper die heat dissipation blind holes 11 can be non-circular, and the lower die heat dissipation through holes 24, upper die heat dissipation blind holes 11, and radial heat dissipation channels 25 can be inclined or curved, etc.

[0026] Preferably, the radial heat dissipation channel 25 includes two sets (or two layers, two channels) distributed in the direction from the material inlet side to the material outlet side; optionally, more sets are provided; two sets are a better solution, which has high heat dissipation efficiency while avoiding affecting the compressive strength of the mold structure.

[0027] In a specific embodiment, the radial heat dissipation channel 25 includes a first radial heat dissipation channel 251 and a second heat dissipation channel, with the second heat dissipation channel located on the discharge side of the first radial heat dissipation channel 251. A mold pad 3 is provided on the discharge side of the lower mold 2; additionally, the mold pad 3 has a mold pad discharge port 31, the shape of which is generally not smaller than the discharge side of the rear cutter 23. The mold pad 3 serves to support, reinforce, and protect the mold. The first radial heat dissipation channel 251 is located near the working zone 22 of the mold hole on the rear cutter 23; the lower mold 2 has a radial heat dissipation groove 252 on its discharge side, which, together with the inlet side of the mold pad 3, forms the second heat dissipation channel. In this design, by utilizing the characteristic that the mold pad 3 blocks the discharge side of the lower mold 2, the radial heat dissipation channel 25 (the second radial heat dissipation channel) is set as an open groove shape, facilitating production and processing, and allowing heat to dissipate between the lower mold 2 and the mold pad 3.

[0028] Furthermore, the rear cutter 23 includes a primary rear cutter 231, a secondary rear cutter 232, and a tertiary rear cutter 233. The die working zone 22, the primary rear cutter 231, the secondary rear cutter 232, and the tertiary rear cutter 233 are sequentially adjacent in the direction from material inlet to material outlet, and their shapes gradually increase, forming a multi-level stepped structure. The inner end of the first radial heat dissipation channel 251 is located at the step formed between the primary rear cutter 231 and the secondary rear cutter 232; preferably, this position is located downstream of the die working zone 22 (on the material outlet side), close to the die working zone 22 and at a suitable distance, which is beneficial for the heat dissipation of the lower die 2.

[0029] Furthermore, the feed side of the lower die 2 has a recessed welding chamber 26, the shape of which is larger than that of the die hole 21; the heat dissipation hole 24 of the lower die is located outside the welding chamber 26. Heat is also generated during the welding stage of the extruded material at the welding chamber 26, and the proximity of the heat dissipation hole 24 to the welding chamber 26 allows for rapid heat conduction to the heat dissipation channel system; in addition, the feed port profile of the upper die 1 generally corresponds to or is close to the welding chamber 26, such as... Figure 1 As shown, the heat dissipation through hole 24 in the lower mold can make the axial heat dissipation channel independent of the space where the raw material flows; of course, there needs to be a certain thickness gap between the axial heat dissipation channel and the space where the raw material flows to ensure structural strength.

[0030] In the illustrated embodiment, the lower mold heat dissipation through-hole 24, the upper mold heat dissipation blind hole 11, and the radial heat dissipation channel 25 are all straight lines. The lower mold heat dissipation through-hole 24 intersects the radial heat dissipation channel 25 perpendicularly, and the radial heat dissipation channel 25 (the radial heat dissipation channel of each layer) is parallel to the material discharge side of the lower mold 2. This straight-line heat dissipation channel structure is easy to process, and the heat dissipation path is direct and clear.

[0031] Preferably, the lower mold heat dissipation through holes 24 and the upper mold heat dissipation blind holes 11 are four or more evenly distributed circumferentially. Too few holes will hinder uniform and rapid heat dissipation. Of course, due to space constraints and to avoid affecting the strength of the mold, too many holes should not be provided. The extension line of each radial heat dissipation channel 25 passes through the central axis of the lower mold 2.

[0032] In the illustrated embodiment, there are four heat dissipation through holes 24 in the lower mold and four blind heat dissipation holes 11 in the upper mold, forming four axial heat dissipation channels evenly distributed around the mold circumference. These channels can precisely align with the positioning holes on the mold used for assembly (such as...). Figure 2 The four holes located diagonally above and below are staggered; for example... Figure 3 As shown, the radial heat dissipation channel 25 is cross-shaped. The axial heat dissipation channels on both sides of the mold are connected through the radial heat dissipation channel 25. The radial heat dissipation channel 25 (and the empty cutter 23 behind the mold hole 21) directly connects the two sides of the lower mold 2.

[0033] Furthermore, a flow divider bridge 12 is provided inside the feed inlet of the upper mold 1, dividing the feed inlet into multiple flow divider holes 13. The cross-sectional shape of the flow divider bridge 12 is narrower in the middle on both the feed and discharge sides, in other words, it has a spindle-shaped structure, forming a narrower knife-edge structure on the feed side of the flow divider bridge 12; and a smooth guide surface is formed on the feed side of the flow divider bridge 12, gradually sloping towards both sides of the flow divider bridge 12, in other words, the guide surface is located on both sides of the knife-edge structure, thereby guiding the raw material to the flow divider holes 13 on both sides of the flow divider bridge 12. This flow divider bridge structure of the present solution makes the feeding almost unobstructed, speeds up the feeding speed, and improves production efficiency.

[0034] For more details, please refer to Figure 1 The upper mold heat dissipation blind hole 11 ends at 1 / 4 to 3 / 4 of the thickness of the upper mold 1 (more preferably about 1 / 2); the discharge side of the flow divider bridge 12 gradually narrows relative to the middle to form the flow divider bridge discharge section, and the length and position of the upper mold heat dissipation blind hole 11 correspond to the flow divider bridge discharge section. Figure 1 The diversion bridge 12 is marked with a dashed line, dividing the shuttle-shaped diversion bridge 12 into the feed section, the middle section, and the discharge section. The height dimensions of the feed section and the middle section are also specified. Figure 1 The dimensions in the left and right directions are roughly the same; the raw material after diversion converges between the upper mold 1 and the lower mold 2 (welding chamber 26), thus having more obvious friction and heat generation with the discharge section of the diversion bridge. The position of the upper mold heat dissipation blind hole 11 corresponds to this, which is conducive to the rapid discharge of heat.

[0035] In the illustrated embodiment, the discharge side of the diversion bridge 12 has a protruding mold core 14, and the middle of the discharge side of the mold core 14 is provided with a mold core heat dissipation blind hole 15 extending towards the inlet side, which can stabilize the upper mold core working belt and dissipate the heat during the production process.

[0036] like Figure 2 In the illustrated embodiment, a process hole 16 (existing technology) is also included. In this solution, the process hole 16 is located in the middle of the material inlet side of the upper mold 1, at the intersection with the flow divider bridge 12, so that the process hole 16 does not affect other structures. The process hole 16 is a blind hole, and there is a sufficient thickness distance between it and the mold core heat dissipation blind hole 15.

[0037] In summary, the high heat dissipation performance extrusion die of this invention is based on the characteristic of frictional heat generation of the extruded raw material in the upper and lower dies. It is provided with interconnected upper die heat dissipation blind holes and lower die heat dissipation through holes, forming an axial heat dissipation channel. The generated heat can be quickly discharged from the upper die to the lower die through this structure. Furthermore, the radial heat dissipation channel is connected to the axial heat dissipation channel opened in the lower die, thereby dissipating the heat inside the die to the outside of the die and increasing the stability of the die. There are multiple radial and axial heat dissipation channels, thus forming heat dissipation channels that can cover the XYZ three directions of space, achieving high heat dissipation efficiency (in a specific embodiment, the frictional heat of the bridge position and working zone when the die is under pressure is carried away through the interconnected heat dissipation channels). At the same time, the existence of these heat dissipation channels will not have a negative impact on the overall structural strength and forming effect of the extrusion die. The high-heat-dissipation extrusion die of this invention further preferably adopts a shuttle-shaped flow divider bridge. The flow divider bridge has a narrower knife-edge shape on the feed side, completely eliminating dead angles, significantly reducing resistance, accelerating the feeding speed, and improving efficiency. Due to the fast feeding speed of this structure, the die heats up quickly. Combined with the rapid heat dissipation effect of the heat dissipation channel structure of this invention, production efficiency can be greatly improved while ensuring the die's service life. Tests have shown that for small extrusion dies producing the same type of material, existing extrusion dies deform after extruding about 100 aluminum bars due to heat. However, the extrusion die using the preferred solution of this invention extruded about 1200 aluminum bars with a total weight of about 20 tons in one go. For small dies, its service life is extremely long, and the improvement effect is more than 10 times, representing a major breakthrough in existing technology.

[0038] As a supplementary explanation: Figure 1 This is a schematic diagram intended to illustrate all key structural elements, a commonly used representation method in the field for dimensioning, guiding mold production, etc. Figure 2 There is no simple cross-section that corresponds to it. Figure 2 Some structural lines in the design are perspective outlines, intended to reflect the structural positional relationships. For example, the solid lines at the flow divider 13 and flow divider bridge 12 represent the material inlet side outline, and the dashed lines represent the material outlet side outline. Similarly, the solid line at the upper mold heat dissipation blind hole 11 represents the material outlet side outline.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; obviously, the described embodiments are some embodiments of this utility model, but not all embodiments; based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model; in the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An extrusion die with high heat dissipation performance, comprising an upper die (1) and a lower die (2), the upper die (1) having an inlet, the lower die (2) being located on the discharge side of the upper die (1), the lower die (2) having a die hole (21), the discharge side of the die hole working zone (22) of the die hole (21) being a rear air cutter (23), characterized in that, The lower mold (2) has multiple heat dissipation holes (24) distributed circumferentially outside the mold hole (21). The heat dissipation holes (24) extend from the material inlet side of the lower mold (2) to the material outlet side of the lower mold (2). The upper mold (1) has multiple heat dissipation blind holes (11) distributed circumferentially outside the material inlet. The heat dissipation blind holes (11) extend from the material outlet side of the upper mold (1) to the material inlet side of the upper mold (1). The heat dissipation blind holes (11) correspond one-to-one with the heat dissipation holes (24) of the lower mold and are connected. The lower mold (2) is also provided with a radial heat dissipation channel (25). The radial heat dissipation channel (25) extends from the outer side of the lower mold (2) to the inner side of the rear cutter (23), and the radial heat dissipation channel (25) is connected with the heat dissipation holes (24) of the lower mold.

2. The high heat dissipation performance extrusion die according to claim 1, characterized in that, The radial heat dissipation channels (25) include two sets distributed in the direction from the feed side to the discharge side.

3. The high heat dissipation performance extrusion die according to claim 2, characterized in that, The radial heat dissipation channel (25) includes a first radial heat dissipation channel (251) and a second heat dissipation channel; a mold pad (3) is provided on the discharge side of the lower mold (2); the first radial heat dissipation channel (251) is located near the working zone (22) of the mold hole of the rear cutter (23); a radial heat dissipation groove (252) is provided on the discharge side of the lower mold (2), and the radial heat dissipation groove (252) and the inlet side of the mold pad (3) enclose the second heat dissipation channel.

4. The high heat dissipation performance extrusion die according to claim 3, characterized in that, The rear cutter (23) includes a first-stage rear cutter (231), a second-stage rear cutter (232), and a third-stage rear cutter (233); the die hole working zone (22), the first-stage rear cutter (231), the second-stage rear cutter (232), and the third-stage rear cutter (233) are sequentially adjacent in the direction from material inlet to material outlet and their shapes are progressively larger; the inner end of the first radial heat dissipation channel (251) is located at the step formed between the first-stage rear cutter (231) and the second-stage rear cutter (232).

5. The extrusion die with high heat dissipation performance according to claim 1, characterized in that, The lower die (2) has a recessed welding chamber (26) on the material feeding side, and the shape range of the welding chamber (26) is larger than that of the die hole (21); the heat dissipation through hole (24) of the lower die is located outside the welding chamber (26).

6. The extrusion die with high heat dissipation performance according to any one of claims 1 to 5, characterized in that, The heat dissipation through hole (24) of the lower mold, the heat dissipation blind hole (11) of the upper mold, and the radial heat dissipation channel (25) are all straight. The heat dissipation through hole (24) of the lower mold and the radial heat dissipation channel (25) intersect perpendicularly. The radial heat dissipation channel (25) is parallel to the material discharge side of the lower mold (2).

7. The extrusion die with high heat dissipation performance according to claim 6, characterized in that, The heat dissipation through holes (24) in the lower mold and the heat dissipation blind holes (11) in the upper mold are four or more evenly distributed in the circumference; the extension line of each radial heat dissipation channel (25) passes through the central axis of the lower mold (2).

8. The extrusion die with high heat dissipation performance according to any one of claims 1 to 5, characterized in that, The upper mold (1) has a flow divider bridge (12) inside the feed inlet, which divides the feed inlet into multiple flow divider holes (13). The cross-sectional shape of the flow divider bridge (12) is narrower in the middle on the feed side and the discharge side. The feed side of the flow divider bridge (12) forms a smooth guide surface that gradually slopes towards both sides of the flow divider bridge (12).

9. The extrusion die with high heat dissipation performance according to claim 8, characterized in that, The upper mold heat dissipation blind hole (11) ends at 1 / 4 to 3 / 4 of the thickness of the upper mold (1); the part of the discharge side of the flow divider (12) that gradually narrows relative to the middle forms the flow divider discharge section, and the length and position of the upper mold heat dissipation blind hole (11) correspond to the flow divider discharge section.

10. The extrusion die with high heat dissipation performance according to any one of claims 1 to 5, characterized in that, The upper mold (1) has a flow divider bridge (12) inside the inlet, which divides the inlet into multiple flow dividers (13); the flow divider bridge (12) has a protruding mold core (14) on the outlet side, and a mold core heat dissipation blind hole (15) extending towards the inlet side is opened in the middle of the outlet side of the mold core (14).

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