Profile hot extrusion dies and production lines

Abstract

This utility model provides a profile hot extrusion die and production line, relating to the field of die technology. The profile hot extrusion die includes a first die and a second die. The first die has a welding chamber and a die cavity. The second die has a countersunk bridge hole, a flow divider bridge located at the bottom of the countersunk bridge cavity, and multiple flow dividers formed by the flow divider bridge. A die core is connected to the back of the flow divider bridge. The die core is located inside the die cavity, and the die core and the die cavity together form a die cavity. The die cavity includes an outer cavity for forming a frame and an inner cavity for forming a partition. The multiple flow dividers include multiple outer holes and inner holes. The multiple outer holes are arranged circumferentially along the outer cavity, and each outer hole communicates with the outer cavity axially. The inner holes are located within the area enclosed by all the outer holes and communicate with the inner cavity axially. The outer cavity has a turning point in the circumferential direction. The cross-section and position of the multiple outer holes are designed to stagger the turning points of the weld seams formed by the metal billets flowing through adjacent outer holes and welding them in the welding chamber.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a profile hot extrusion mold and production line. Background Technology

[0002] Automotive crash beams are key energy-absorbing components in vehicle collision safety systems. Aluminum alloy crash beams typically have complex cross-sectional structures, usually consisting of an outer frame and multiple partitions within the frame. These partitions divide the frame's interior into several independent cavities. To achieve connections and reinforcement, aluminum alloy crash beams may also have targeted wall thickness designs in certain areas of the cross-section. This complicates the hot extrusion molding of the profiles and affects their forming quality. In particular, crash beam profiles are often made of high-strength materials such as 6082-T6 aluminum alloy. 6082-T6 aluminum alloy has a high alloy element content and high deformation resistance. During hot extrusion molding, the extruded profiles are prone to defects such as twisting, waviness, and dimensional deviations due to differences in material supply to different parts. Utility Model Content

[0003] This utility model aims to address, to a certain extent, the problem of how to improve the molding quality of anti-collision beam profiles in extrusion molding in related technologies.

[0004] To at least partially address at least one aspect of the aforementioned problems, in a first aspect, this utility model provides a profile hot extrusion die for extruding a profile having a frame and partitions, the profile hot extrusion die comprising: The first mold is equipped with a welding chamber and a mold cavity; The second mold has a submerged bridge hole, a flow divider bridge located at the bottom of the submerged bridge hole cavity, and multiple flow divider holes formed by the flow divider bridge; the back of the flow divider bridge is connected to a mold core, the mold core is located inside the mold cavity, and the mold core and the mold cavity together form a mold cavity; The cavity includes an outer cavity for forming the frame and an inner cavity for forming the partition; the plurality of diversion holes include a plurality of outer holes and an inner hole, the plurality of outer holes are arranged circumferentially along the outer cavity, and each of the outer holes communicates with the outer cavity in the axial direction; the inner hole is located in the area enclosed by all the outer holes and communicates with the inner cavity in the axial direction. The outer cavity has a turning point in the circumferential direction; the cross-sections and positions of the plurality of outer holes are designed to such that the weld seams of metal blanks that are diverted through adjacent outer holes and welded in the welding chamber are staggered from the turning point.

[0005] Optionally, the circumferential inner wall of the welding chamber is provided with an inwardly convex structure, which is provided corresponding to the weld seam and located on the transverse extension path of the weld seam.

[0006] Optionally, the mold core and the mold cavity are respectively provided with a mold core working belt and a mold cavity working belt, and the mold core working belt and the mold cavity working belt together form the cavity; the mold cavity working belt and the mold core working belt are designed with different lengths at multiple positions to balance the flow rate of the metal blank at multiple positions in the cavity.

[0007] Optionally, the lengths of the core working strip and the cavity working strip at the thicker part of the outer cavity are less than the lengths of the core working strip and the cavity working strip at the thinner part of the outer cavity. And / or, the cavity thickness at at least one end of the outer cavity along its length direction is less than the cavity thickness at the middle position along the length direction, and the length of the mold core working strip and the mold cavity working strip at the end position is less than the length of the mold core working strip and the mold cavity working strip at the middle position; And / or, the length of the mold core working strip and the mold cavity working strip in the inner cavity is less than the length of the mold core working strip and the mold cavity working strip at at least a portion of the location in the outer cavity.

[0008] Optionally, a flow-blocking block is provided at the entrance of the mold cavity, the flow-blocking block is arranged circumferentially along the entrance of the mold cavity, and the flow-blocking block extends axially into the welding chamber.

[0009] Optionally, the outer cavity includes a convex corner structure, and the flow-blocking block is provided with a notch structure corresponding to the convex corner structure.

[0010] Optionally, the inner hole extends beyond both ends of the inner cavity along the cavity thickness direction.

[0011] Optionally, the flow splitting ratio of the diversion hole is 65%-75%; the depth of the submerged bridge hole is 8mm.

[0012] Optionally, the profile is the body of a crash beam.

[0013] Secondly, this utility model provides a production line, including the profile hot extrusion die as described in the first aspect above.

[0014] In the profile hot extrusion die and production line of this utility model, the countersunk bridge hole can pre-divert and buffer the metal billet, improve the uniformity of metal flow, help the flow distribution between the diversion holes, and reduce the impact of material on the front of the diversion bridge. Setting multiple diversion holes as including multiple outer holes and inner holes, with the outer holes arranged circumferentially along the outer cavity and each outer hole axially connected to the outer cavity, facilitates relatively independent metal supply to each area of ​​the frame. After flowing out of the outer holes, the metal billet can smoothly enter the outer cavity, thereby reducing the flow velocity difference between different parts of the outer cavity. Simultaneously, setting the inner hole within the area enclosed by all the outer holes and axially connected to the inner cavity provides a relatively independent material supply path for the inner cavity, reducing the probability of material competition between the outer and inner cavities, thereby reducing the risk of insufficient material supply in the inner cavity due to high flow resistance. Building upon this, the weld seam of the metal billets from adjacent external holes, welded within the welding chamber, is further staggered from the circumferential turning point of the outer cavity. This avoids the weld seam area, with its relatively weak mechanical properties and complex forming factors, coinciding with the stress-concentrated turning point area. Furthermore, the corresponding external holes ensure the supply of metal billets at the turning point, improving the structural continuity and performance of the formed structure at that location. Therefore, the rational layout of the diversion holes helps to balance the material supply during the forming of the frame and partition, suppressing defects such as twisting, waviness, and dimensional deviations caused by uneven material supply. Simultaneously, optimizing the weld seam position reduces the risk of failure at the turning point under subsequent stress conditions, thereby improving the overall forming quality and reliability of the profile.

[0015] Overall, this utility model, through the partitioned layout of the diversion holes and the arrangement of the weld seams, not only helps to ensure sufficient material supply to the frame and partition of the profile, but also helps to improve the continuity of the structure in the stress concentration area (corresponding to the turning position). Thus, in the hot extrusion forming of profiles such as high-strength aluminum alloys (e.g., 6082-T6), the forming quality and consistency of the profile can be improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the profile in an embodiment of this utility model; Figure 2 This is a schematic diagram of the axial structure of the first and second dies of the profile hot extrusion die in an embodiment of this utility model when forming the cavity; Figure 3 This is a schematic diagram of the structure of the profile hot extrusion die when the first and second dies separate in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the second module in an embodiment of this utility model; Figure 5 This is a schematic diagram of the back side of the second mold in an embodiment of this utility model; Figure 6 This is a schematic diagram of the structure of the first module in an embodiment of this utility model; Figure 7 This is a schematic diagram of the corresponding area of ​​the metal billet diverted by the diversion hole in the cavity in an embodiment of this utility model; Figure 8 This is a schematic diagram showing the weld seam of the metal billet welded by the diversion hole and the inner convex structure of the first mold in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1-First mold; 11-Welding chamber; 12-Mold cavity; 13-Inner convex structure; 14-Mold cavity working zone; 15-Flow blocking block; 16-Notch structure; 17-Air cutter; 18-Discharge hole; 2-Second mold; 21-Subsurface bridge hole; 22-Flow divider bridge; 23-Flow divider hole; 231-Outer hole; 232-Inner hole; 24-Mold core; 25-Mold core working zone; 3-Setting profile; 31-Frame; 311-Angle structure; 32-Partition plate; 4-Cavity; 41-Outer cavity; 411-Convex angle structure; 412-Turning position; 413-End position; 414-Middle position; 42-Inner cavity; 5-Welding seam. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0021] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0022] An embodiment of this utility model provides a profile hot extrusion die for setting the extrusion molding of profile 3, such as... Figure 1 As shown, the profile 3 includes a frame 31 and a partition 32 connected to the frame 31.

[0023] like Figures 2 to 7 As shown, the main reference is... Figure 2 , Figure 3 and Figure 7 The profile hot extrusion die includes a first die 1 and a second die 2 that cooperate with each other along the axial direction; the first die 1 is provided with a welding chamber 11 and a die cavity 12; the feed end of the second die 2 is recessed along the axial direction to form a bridge hole 21, and a flow divider 22 is provided at the bottom of the bridge hole 21, and multiple flow divider holes 23 are formed by the flow divider 22; the back of the flow divider 22 is connected to a die core 24, the die core 24 is located in the die cavity 12, and the die core 24 and the die cavity 12 together form a cavity 4 for forming the profile 3.

[0024] Cavity 4 includes an outer cavity 41 for forming frame 31 and an inner cavity 42 for forming partition 32; the plurality of diversion holes 23 include a plurality of outer holes 231 and inner holes 232, the plurality of outer holes 231 are arranged circumferentially along the outer cavity 41, and each outer hole 231 communicates with the outer cavity 41 in the axial direction; the inner hole 232 is located in the area enclosed by all the outer holes 231 and communicates with the inner cavity 42 in the axial direction.

[0025] like Figure 2 and Figure 7 As shown, the outer cavity 41 has a turning point 412 in the circumferential direction; the cross-section and position of the multiple outer holes 231 are designed to be such that the weld seam 5 of the metal billet that is diverted through the adjacent outer holes 231 and welded in the welding chamber 11 is staggered at the turning point 412.

[0026] like Figure 1 As shown, this specification will use profile 3 as an example to describe the content of this utility model. That is to say, the profile formed by the hot extrusion die is used to manufacture the body of the anti-collision beam. However, it should be understood that this is not a limitation. Without violating the design concept of this utility model, it can also be used to form other similar profiles.

[0027] For example, both the first mold 1 and the second mold 2 are cylindrical structures with the same diameter, and are assembled together by locating pins and fasteners. The adjacent end faces of the first mold 1 and the second mold 2 abut against each other to form a closed profile hot extrusion die.

[0028] like Figure 3 and Figure 6 As shown, the first mold 1 is provided with a welding chamber 11 and a mold cavity 12. The welding chamber 11 is located on the feed end side of the first mold 1 and is a cavity with a certain depth along the axial direction. It is used to accommodate the metal billet diverted from the diversion hole 23 of the second mold 2, so that the diverted metal billet is re-welded into a whole under the action of hydrostatic pressure. The mold cavity 12 is located downstream of the welding chamber 11 and is connected to the welding chamber 11. It is used to accommodate the mold core 24 and form the cavity 4. The outlet side of the mold cavity 12 is provided with a blanking tool 17 and a discharge hole 18.

[0029] like Figure 2 , 4 As shown in Figure 5, the feed end of the second die 2 has an axially recessed recessed area forming a bridge hole 21. The bridge hole 21 can be a circular recessed space located on the feed end face of the second die 2. A flow divider 22 is provided at the bottom of the cavity of the bridge hole 21. The flow divider 22 is a structure on the second die 2 used to separate the flow dividers 23, and its shape and size are determined according to the layout of the flow dividers 23. Through the separation of the flow dividers 22, multiple flow dividers 23 are formed at the bottom of the cavity of the bridge hole 21. The bridge hole 21 can provide a buffer zone, effectively reducing the direct impact friction on the flow dividers 22, reducing the extrusion pressure, and also facilitating the distribution of the metal billet among the various flow dividers 23. The depth of the bridge hole 21 can be adjusted according to actual needs. In this embodiment, the axial depth of the bridge hole 21 is 5-10 mm, for example, 8 mm.

[0030] The back of the flow divider bridge 22 is connected to the mold core 24. The mold core 24 extends axially from the discharge end face of the second mold 2 and extends into the mold cavity 12 of the first mold 1. The mold core 24 and the mold cavity 12 together form a cavity 4 for forming the profile 3. The cavity 4 is the space where the metal billet is finally formed inside the profile hot extrusion die.

[0031] like Figure 2 , 7 As shown, the cavity 4 is designed according to the cross-sectional structure of the profile 3. In this embodiment, the cavity 4 is divided into an outer cavity 41 and an inner cavity 42. The outer cavity 41 corresponds to the frame 31 portion of the profile 3 and is used to form the outer and inner contours of the frame 31; the inner cavity 42 corresponds to the partition 32 portion of the profile 3 and is used to form the shape and position of the partition 32. The outer cavity 41 and the inner cavity 42 are interconnected within the cavity 4, together forming the complete cross-sectional shape of the profile 3.

[0032] The multiple flow-diverting holes 23 are divided into two categories: outer holes 231 and inner holes 232. There are multiple outer holes 231 arranged circumferentially along the outer cavity 41, and each outer hole 231 is axially connected to the outer cavity 41. In other words, the position and number of outer holes 231 are designed according to the shape and size of the frame 31, ensuring that each area of ​​the frame 31 has a corresponding flow-diverting hole 23 for direct material supply. This ensures that after the metal billet flows out from the outer holes 231, it can directly and quickly reach the outer cavity 41, providing a metal billet supply for the forming of the frame 31 within the outer cavity 41.

[0033] The inner hole 232 is located within the area enclosed by all the outer holes 231, i.e., near the center of the mold. The inner hole 232 communicates axially with the inner cavity 42. This design ensures that the inner hole 232 can directly supply metal blanks to the inner cavity 42, reducing the possibility of insufficient metal blank supply at the inner cavity 42.

[0034] like Figure 1 As shown, the frame 31 typically has a unique structure, forming turning points, such as the corners of the frame 31. In the outer cavity 41, this manifests as multiple turning points 412 in the circumferential direction. In actual use, stress concentration may occur at these turning points of the frame 31. Figure 2 and Figure 7 The turning point 412 is only shown schematically in the text.

[0035] Figure 7 In the diagram, the layout areas of the same diversion hole 23 and its diverted metal blanks within the cavity 4 are schematically shown using colored areas of the same color (or similar colors). The layout areas of different diversion holes 23 and their diverted metal blanks within the cavity 4 are shown using colored areas of different colors. The boundary positions of the different colored areas within the cavity 4 roughly correspond to the positions of the corresponding weld seams 5. (Refer to...) Figure 8 The locations of multiple weld seams 5 are schematically shown through several irregular gray areas.

[0036] The cross-sectional shape and position of the multiple external holes 231 are designed so that the confluence area (i.e., weld seam 5) where the metal billets diverted by two adjacent external holes 231 are re-welded in the welding chamber 11 avoids the turning point 412. It should be noted that the weld seam 5 is unavoidable during the diversion die extrusion process; it is essentially the interface formed when multiple metal billets are re-welded in the welding chamber 11. The metal microstructure at the weld seam 5 differs from the matrix, and its mechanical properties (especially elongation and toughness) may be lower than those of the matrix material. By offsetting the weld seam 5 from the turning point 412, that is, by positioning the weld seam 5 along the straight section or non-stress concentration area of ​​the frame 31, the adverse effects of the weld seam 5 on the overall mechanical properties of the formed profile 3 can be avoided.

[0037] The cross-sectional shape and position of the outer hole 231 can be achieved by adjusting parameters such as the width of the diversion bridge 22, the diameter of the diversion hole 23, and the hole spacing. For example, in the circumferential region corresponding to the turning position 412, the circumferential edge of the outer hole 231 can be adjusted so that the weld seam 5 falls on the straight section between the turning positions 412.

[0038] Thus, in this embodiment of the invention, the submerged bridge hole 21 can pre-divert and buffer the metal billet, improve the uniformity of metal flow, facilitate the flow distribution among the various diversion holes 23, and reduce the impact of material on the front of the diversion bridge 22. The multiple diversion holes 23 are configured to include multiple outer holes 231 and inner holes 232, with the outer holes 231 arranged circumferentially along the outer cavity 41 and each outer hole 231 axially connected to the outer cavity 41. This allows each area of ​​the frame 31 to receive a relatively independent metal supply, and the metal billet can flow smoothly into the outer cavity 41 after exiting from the outer holes 231, thereby reducing the flow velocity differences between different parts of the outer cavity 41. Simultaneously, the inner hole 232 is located within the area enclosed by all the outer holes 231 and axially connected to the inner cavity 42, providing a relatively independent feeding path for the inner cavity 42, reducing the probability of material competition between the outer cavity 41 and the inner cavity 42, thereby reducing the risk of insufficient material supply in the inner cavity 42 due to high flow resistance. Based on this, the weld seam 5, where the metal blanks diverted by adjacent external holes 231 are welded in the welding chamber 11, is further staggered from the circumferential turning point 412 of the outer cavity 41. On the one hand, this avoids the weld seam 5 area, with relatively weak mechanical properties and complex forming influencing factors, from coinciding with the stress concentration turning point 412 area. On the other hand, the supply of metal blanks at the turning point 412 can be guaranteed through the corresponding external holes 231, which is beneficial to improving the structural continuity and performance of the structure after forming at the turning point 412. Therefore, the rational layout of the diversion holes 23 helps to balance the material supply during the forming of the frame 31 and the partition 32, suppressing defects such as twisting, waviness, and dimensional deviations caused by uneven material supply. At the same time, the optimization of the weld seam 5 position helps to reduce the failure risk of the turning point 412 under subsequent stress conditions, thereby improving the overall forming quality and reliability of the profile 3.

[0039] Overall, this utility model, through the partitioned layout of the diversion holes 23 and the arrangement design of the weld seams 5, not only helps to ensure sufficient material supply to the frame 31 and partition 32 of the profile 3, but also helps to improve the structural continuity of the stress concentration area (corresponding to the turning position 412). Thus, in the hot extrusion forming of the profile 3, such as high-strength aluminum alloy (e.g., 6082-T6), the forming quality and consistency of the profile can be improved.

[0040] like Figure 6 , 7As shown in Figures 8 and 9, optionally, the circumferential inner wall of the welding chamber 11 is provided with an inner convex structure 13, which is provided corresponding to the welding seam 5 and is located on the transverse extension path of the welding seam 5.

[0041] The transverse direction is perpendicular to the axial direction. Specifically, the weld seam 5 typically extends along the thickness direction of the outer cavity 41. During the extrusion process of the split die, when multiple metal billets are re-welded in the welding chamber 11, the density and bonding strength at the weld seam 5 are affected by the combined effects of hydrostatic pressure, temperature, and metal flow state. If the hydrostatic pressure at the weld seam 5 is insufficient or the metal flow state is poor, defects such as microcracks, voids, or poor bonding may occur at the weld seam 5, causing the profile 3 to fail first at the weld seam 5 during service.

[0042] In this embodiment, when multiple metal billets flow out from adjacent external holes 231 and converge in the welding chamber 11, the metal billets flow axially downstream. When flowing near the inner convex structure 13, the inner convex structure 13 locally obstructs the flow of the metal billets, slowing down the flow rate and increasing the hydrostatic pressure at that location. Since the inner convex structure 13 is located on the transverse extension path of the weld seam 5, this increase in local hydrostatic pressure is transmitted transversely to the location of the weld seam 5, thereby promoting atomic diffusion and recrystallization of the metal grains at the weld seam 5, improving the bonding strength and density of the weld seam 5, and thus improving the molding quality of the anti-collision beam body extrusion molding.

[0043] like Figure 3 , 5 As shown in Figures 6 and 7, optionally, the mold core 24 and the mold cavity 12 are respectively provided with a mold core working belt 25 and a mold cavity working belt 14, which together form the cavity 4; the mold cavity working belt 14 and the mold core working belt 25 are designed with different lengths at multiple positions to balance the flow rate of the metal blank at multiple positions in the cavity 4.

[0044] The lengths of the core working strip 25 and the cavity working strip 14 refer to their axial dimensions, specifically the axial distance from the beginning (near the welding chamber 11) to the end (near the empty cutter 17) of the working strip. The length of the working strip affects the magnitude of the frictional resistance experienced by the metal billet when flowing at that location. The longer the working strip, the greater the frictional resistance and the slower the flow rate of the metal billet; conversely, the shorter the working strip, the smaller the frictional resistance and the faster the flow rate of the metal billet.

[0045] In areas where the metal billet flows at a relatively high velocity within cavity 4, a longer working zone can be set to slow down the flow rate by increasing frictional resistance; conversely, in areas where the metal billet flows at a relatively low velocity, a shorter working zone can be set to accelerate the flow rate by reducing frictional resistance. Through this differentiated control of "suppressing the flow rate when it is fast and accelerating the flow rate when it is slow," the flow rate of the metal billet at multiple locations within cavity 4 can be made more balanced.

[0046] The lengths of the die core working strip 25 and the die cavity working strip 14 can vary continuously within a certain range, or they can be designed in stages. For example, they can be set to 4-5 mm in thin-walled areas and 8-12 mm in thick-walled areas. The specific length values ​​need to be determined comprehensively based on factors such as the cross-sectional dimensions of the profile 3, the wall thickness distribution, the alloy material, and the extrusion process parameters.

[0047] Thus, by setting the mold core working belt 25 and the mold cavity working belt 14 on the mold core 24 and the mold cavity 12 respectively, and designing their lengths differently at multiple locations, the flow rate of the metal billet at different locations within the cavity 4 can be controlled. This makes the flow rate of the metal billet at multiple locations within the cavity 4 more uniform, which helps to eliminate defects such as twisting, waviness, and dimensional deviations in the set profile 3 caused by uneven flow rate, thereby improving the forming accuracy and surface quality of the set profile 3.

[0048] Optionally, the lengths of the core working belt 25 and the cavity working belt 14 at the thicker part of the outer cavity 41 are less than the lengths of the core working belt 25 and the cavity working belt 14 at the thinner part of the outer cavity 41.

[0049] The cavity thickness direction of the outer cavity 41 can be understood as the wall thickness direction of the frame 31. Without considering other factors, setting a shorter core working strip 25 and cavity working strip 14 at the thicker part of the outer cavity 41 can appropriately reduce frictional resistance and help the metal billet pass through smoothly. Setting a longer core working strip 25 and cavity working strip 14 at the thinner part of the cavity can appropriately increase frictional resistance and prevent the metal billet from flowing too fast due to the narrow channel, thereby balancing the flow rate of the metal billet at different positions.

[0050] like Figure 2 , 7 As shown, optionally, the cavity thickness at the end position 413 of the outer cavity 41 along its length direction is less than the cavity thickness at the middle position 414 along its length direction, and the length of the mold core working belt 25 and the mold cavity working belt 14 at the end position 413 is less than the length of the mold core working belt 25 and the mold cavity working belt 14 at the middle position 414.

[0051] The end positions 413 of the outer cavity 41 refer to the two ends of the frame 31 in the length direction. These areas are usually located at the edges of the profile 3. The metal billet feeding path is long and the flow resistance is large, which may lead to insufficient material supply. Setting the cavity thickness at the end positions 413 to be thinner and setting shorter mold core working belts 25 and mold cavity working belts 14 is beneficial to ensure the forming of the outer cavity 41 at the end positions 413 and the uniform flow rate of the metal billet.

[0052] like Figure 5 , 7As shown, optionally, the lengths of the core working belt 25 and the cavity working belt 14 at the inner cavity 42 are at least less than the lengths of the core working belt 25 and the cavity working belt 14 at a certain location on the outer cavity 41.

[0053] The core working belt 25 and the cavity working belt 14 at the inner cavity 42 are located at the discharge position of the flow divider bridge 22. The channel is relatively narrow, the flow path is long, and the feeding resistance is large. The core working belt 25 and the cavity working belt 14 at the inner cavity 42 are relatively short, which can reduce frictional resistance and help the metal billet pass through smoothly.

[0054] For example, the lengths of the end position 413 at at least one end of the outer cavity 41 along its length direction and the lengths of the core working strip 25 and the cavity working strip 14 at the inner cavity 42 are the same, for example, 4-7 mm, or 4 mm. The lengths of the core working strip 25 and the cavity working strip 14 at the middle position 414 of the outer cavity 41 along its length direction are 8-12 mm, for example, 11 mm.

[0055] like Figure 2 , 6 As shown in Figures 7 and 8, optionally, a flow-blocking block 15 is provided at the entrance of the mold cavity 12. The flow-blocking block 15 is arranged circumferentially along the entrance of the mold cavity 12 and extends axially into the welding chamber 11.

[0056] The entrance to the mold cavity 12 refers to the junction where the mold cavity 12 connects to the welding chamber 11, and is the necessary passage for the metal billet to enter the mold cavity 12 from the welding chamber 11. The flow-blocking block 15 is disposed at this entrance and extends axially upstream into the welding chamber 11. The working zone 14 of the mold cavity may be partially located on the inner sidewall of the flow-blocking block 15.

[0057] The flow obstruction block 15 can be configured with flow obstruction angle and flow promotion angle according to the adjustment requirements of the metal billet, which will not be elaborated here.

[0058] When the metal billet flows from the welding chamber 11 to the mold cavity 12, the flow-blocking block 15 will have a local adjustment effect on the metal billet flowing through its location. Through the structural design of the flow-blocking block 15, the flow direction of the metal billet can be adjusted, and the metal billet can be guided to bypass the flow obstacle area and supplement the flow to the area with insufficient material supply. This improves the distribution state of the metal billet at the entrance of the mold cavity 12, reduces the possibility of incomplete filling or surface defects of the metal billet at the entrance of the mold cavity 12, and improves the molding quality and surface quality of the set profile 3. It is especially suitable for the extrusion molding of set profile 3 with complex cross-sectional shape.

[0059] like Figure 2 , 6 As shown, optionally, the outer cavity 41 includes a convex corner structure 411, and the flow blocking block 15 is provided with a notch structure 16 arranged corresponding to the convex corner structure 411.

[0060] A convex corner structure 411 refers to a sharp corner or bend protruding outward on the contour of the outer cavity 41. It is usually formed by connecting multiple straight line segments or smoothly connecting them. The angle between two straight line segments is, for example, an acute angle. Its characteristic is that the contour direction changes abruptly, forming a noticeable protrusion. In the profile 3, the convex corner structure 411 usually corresponds to the corner structure 311 of the frame 31. The corner structure 311 serves a connecting function or bears greater stress during collision.

[0061] The notch structure 16 refers to a local recess or break area formed by the flow-blocking block 15 at the circumferential position corresponding to the convex corner structure 411, that is, a notch is opened on the continuous structure of the flow-blocking block 15. The shape and size of the notch match the convex corner structure 411, so that the entrance area of ​​the mold cavity 12 at the convex corner structure 411 is not covered by the flow-blocking block 15.

[0062] Thus, by utilizing the flow velocity difference formed by the overall obstruction of the flow block 15 and the partial release of obstruction by the notch structure 16, the flow velocity of the metal billet at the corresponding position of the notch structure 16 is relatively accelerated, which increases the supply of metal billet at the convex corner structure 411. This helps to prevent angle deformation or filling defects at the convex corner structure 411 due to insufficient material supply or flow velocity lag, improves the forming accuracy and structural integrity of the set profile 3 at the corner structure 311, and enhances the forming quality of the set profile 3 at the corner structure 311.

[0063] like Figure 2 and Figure 7 As shown, optionally, the inner hole 232 extends beyond both ends of the inner cavity 42 along the cavity thickness direction, and the cavity thickness direction is the same as the plate thickness direction of the partition 32.

[0064] Specifically, the inner hole 232 being set beyond both ends of the inner cavity 42 means that the axial projection of the inner hole 232 covers the entire thickness direction of the inner cavity 42 and extends beyond its two end boundaries.

[0065] In this way, ensuring the supply of metal blanks from the inner hole 232 to the inner cavity 42 helps reduce the possibility of insufficient metal blank supply at the inner cavity 42 due to the long flow path and high resistance.

[0066] Optionally, the flow splitting ratio of the flow splitting orifice 23 is 65%-75%.

[0067] The flow ratio is the ratio of the total area of ​​the flow diversion holes 23 to the cross-sectional area of ​​the basic finished product. In this embodiment, the flow ratio of the flow diversion holes 23 is controlled within the range of 65%-75%, for example, the flow ratio is 70%. Under the premise of ensuring the strength of the mold, the flow resistance of the metal billet when passing through the flow diversion holes 23 is effectively reduced, which is conducive to reducing the extrusion pressure, slowing down the wear of the mold, and extending the service life of the mold. At the same time, it ensures sufficient material supply capacity, which is conducive to improving the forming quality and production efficiency of the set profile 3.

[0068] Optionally, the depth of the slab arch 21 is 8 mm.

[0069] An embodiment of this utility model also includes a production line comprising a profile hot extrusion die as described in the above embodiment.

[0070] For example, the production line is a crash beam production line, equipped with profile hot extrusion molds. The production line has all the beneficial effects of profile hot extrusion molds, which will not be elaborated here.

[0071] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A profile hot extrusion die for extrusion molding of a prescribed profile (3) having a frame (31) and a partition (32), characterized by, include: The first mold (1) is provided with a welding chamber (11) and a mold cavity (12); The second mold (2) is provided with a sinker hole (21), a flow divider (22) located at the bottom of the sinker hole (21) cavity, and a plurality of flow divider holes (23) formed by the flow divider (22); the back of the flow divider (22) is connected to a mold core (24), the mold core (24) is located in the mold cavity (12), and the mold core (24) and the mold cavity (12) together form a mold cavity (4); The cavity (4) includes an outer cavity (41) for forming the frame (31) and an inner cavity (42) for forming the partition (32); the plurality of diversion holes (23) include a plurality of outer holes (231) and inner holes (232), the plurality of outer holes (231) are arranged circumferentially along the outer cavity (41), and each of the outer holes (231) communicates with the outer cavity (41) axially; the inner hole (232) is located in the area enclosed by all the outer holes (231) and communicates with the inner cavity (42) axially; The outer cavity (41) has a turning point (412) in the circumferential direction; the cross-section and position of the plurality of outer holes (231) are designed such that the weld seam (5) of the metal billet that is diverted through the adjacent outer holes (231) and welded in the welding chamber (11) is staggered from the turning point (412).

2. The profile hot extrusion die as described in claim 1, characterized in that, The circumferential inner wall of the welding chamber (11) is provided with an inner convex structure (13), which is provided corresponding to the weld seam (5) and located on the transverse extension path of the weld seam (5).

3. The profile hot extrusion die as described in claim 1, characterized in that, The mold core (24) and the mold cavity (12) are respectively provided with a mold core working belt (25) and a mold cavity working belt (14), which together form the cavity (4); the mold cavity working belt (14) and the mold core working belt (25) are designed with different lengths at multiple positions to balance the flow rate of the metal blank at multiple positions in the cavity (4).

4. The profile hot extrusion die as described in claim 3, characterized in that, The lengths of the core working strip (25) and the cavity working strip (14) at the thicker part of the outer cavity (41) are less than the lengths of the core working strip (25) and the cavity working strip (14) at the thinner part of the outer cavity (41). And / or, the cavity thickness of the outer cavity (41) at at least one end position (413) along its length direction is less than the cavity thickness at the middle position (414) along the length direction, and the length of the mold core working strip (25) and the mold cavity working strip (14) at the end position (413) is less than the length of the mold core working strip (25) and the mold cavity working strip (14) at the middle position (414); And / or, the lengths of the core working belt (25) and the cavity working belt (14) at the inner cavity (42) are less than the lengths of the core working belt (25) and the cavity working belt (14) at at least a portion of the outer cavity (41).

5. The profile hot extrusion die as described in claim 1, characterized in that, A flow-blocking block (15) is provided at the entrance of the mold cavity (12). The flow-blocking block (15) is arranged circumferentially along the entrance of the mold cavity (12) and extends axially into the welding chamber (11).

6. The profile hot extrusion die as described in claim 5, characterized in that, The outer cavity (41) includes a convex corner structure (411), and the flow blocking block (15) is provided with a notch structure (16) corresponding to the convex corner structure (411).

7. The profile hot extrusion die as described in claim 1, characterized in that, Along the thickness direction of the inner cavity (42), the inner hole (232) extends beyond both ends of the inner cavity (42).

8. The profile hot extrusion die as described in claim 1, characterized in that, The flow splitting ratio of the flow splitting hole (23) is 65%-75%; the depth of the bridge hole (21) is 8mm.

9. The profile hot extrusion die as described in claim 1, characterized in that, The set profile (3) is the anti-collision beam body.

10. A production line, characterized in that, Includes the profile hot extrusion die as described in any one of claims 1 to 9.

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