Pagoda type branch flow control extrusion die

Abstract

The utility model discloses a pagoda type branch flow control extrusion die which comprises an upper die and a lower die which are installed in a matched mode, a boss is arranged in the middle of the feeding side of the upper die, and a middle feeding hole penetrating in the feeding direction is formed in the range of the boss. On the feeding side of the upper die, peripheral arc-shaped feeding holes are formed in the periphery of the boss, and the feeding side face of the boss is flush with or higher than the feeding side faces of the peripheral arc-shaped feeding holes; a plurality of peripheral flow dividing bridges are arranged in the peripheral arc-shaped feeding hole, the feeding side face of each peripheral flow dividing bridge is lower than that of the peripheral arc-shaped feeding hole, the discharging side of the peripheral arc-shaped feeding hole is divided into a plurality of peripheral flow dividing holes through the peripheral flow dividing bridges, and the peripheral flow dividing holes are through in the feeding direction. The feeding device can achieve the effect that feeding is slow in the middle and fast in the periphery, the flow and the flow speed of all parts can be controlled more carefully and accurately, therefore, the feeding effect is good, the profile forming degree is good, and high-quality production of profiles with hollow middles and complex peripheral shapes can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion die technology, specifically relating to a pagoda-type split flow extrusion die. Background Technology

[0002] Taking aluminum profiles as an example, the basic principle of profile extrusion molding is to apply a certain pressure to the raw aluminum rod, causing it to flow out from the die hole or the gap between the die hole and the die core, thereby obtaining a profile with the required cross-sectional shape and size. During this process, it is necessary to ensure that the flow rate is consistent throughout the profile's cross-sectional shape during extrusion. Specifically, this is achieved by controlling the flow distribution within the extrusion die's internal structure to match the flow rate at each point with the cross-sectional shape; otherwise, it is impossible to produce a flat, straight profile with an ideal cross-sectional shape. For example... Figure 5 The profile shown has a large cross-sectional size, with an empty center and cavities, screw holes, and cantilever structures on the surrounding sidewalls. Therefore, a relatively sufficient amount of material needs to be fed into the outer perimeter. A certain amount of material also needs to be fed into the inner perimeter to allow the aluminum material on both sides to be welded together at the die opening. Furthermore, since the aluminum rod is extruded and fed into the center of the extrusion die, the flow rate and volume are typically faster in the center compared to the outer perimeter. This causes difficulties in forming this type of profile, and dies designed using existing conventional methods often exhibit defects such as unsatisfactory local structural forming. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pagoda-type split flow extrusion die, which solves the problem that existing extrusion dies are difficult to produce normally for profiles with a hollow center and a complex outer shape. The new structural design enables better control of the feed split and flow rate, forming the required feeding effect of slow in the middle and fast on the periphery.

[0004] According to the technical solution of this utility model, this utility model provides a pagoda-type split flow extrusion die, including an upper die and a lower die that are installed together. A boss is provided at the middle position of the feed side of the upper die, and a central feed hole that runs through the feed direction is provided within the area of ​​the boss. On the feed side of the upper die, an outer arc-shaped feed hole is provided around the boss, and the feed side of the boss is flush with or higher than the feed side of the outer arc-shaped feed hole. Multiple outer diversion bridges are provided in the outer arc-shaped feed hole, and the feed side of the outer diversion bridges is lower than the feed side of the outer arc-shaped feed hole. The outer diversion bridges divide the discharge side of the outer arc-shaped feed hole into multiple outer diversion holes, and the outer diversion holes run through the feed direction.

[0005] In some embodiments, the profile produced has a U-shaped cross-section, the U-shaped structure including two side walls and a bottom wall, and at least one side wall has a cavity, the opening of the U-shaped structure is opposite to the bottom wall; a protruding mold core is provided on the discharge side of the upper mold, the mold core is opposite to the cavity.

[0006] In some implementations, the size of the peripheral diversion hole corresponding to the opening position is smaller than the size of the peripheral diversion hole corresponding to the bottom wall position.

[0007] In some embodiments, the position of the central feed hole corresponds to the interior of the U-shaped structure of the profile cross-section; there are two peripheral arc-shaped feed holes, and the positions of the two peripheral arc-shaped feed holes correspond to the two side walls on both sides; on the side corresponding to the opening, there is a first interval between the two peripheral arc-shaped feed holes; on the side corresponding to the bottom wall, there is a second interval between the two peripheral arc-shaped feed holes.

[0008] In some embodiments, a protruding blocking block is provided on the discharge side of the upper die, the blocking block extending from a first interval position to the middle position of the upper die.

[0009] In some embodiments, on the feed side of the upper mold, the edge contours of the two peripheral arc-shaped feed holes are concentric with the edge contours of the boss.

[0010] In some embodiments, the boss and the feed side of the peripheral diversion bridge have a chamfer that gradually expands outward from the feed direction to the discharge direction, or the boss and the feed side of the peripheral arc-shaped feed hole have a chamfer that gradually expands outward from the feed direction to the discharge direction.

[0011] In some implementations, there are multiple central feed holes, which are separated by a central flow bridge.

[0012] In some embodiments, the peripheral arc-shaped feed hole is an oblique hole that gradually expands outward from the feed direction to the discharge direction, and / or the peripheral diversion hole is an oblique hole that gradually expands outward from the feed direction to the discharge direction.

[0013] In some embodiments, the lower mold is provided with a welding chamber, and a through mold hole is provided in the welding chamber.

[0014] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0015] This utility model's pagoda-type split-flow extrusion die features a central through-hole as a central feed hole. The feed side of the central feed hole protrudes and is relatively higher than its surrounding surfaces, forming a boss structure that can be visually described as pagoda-shaped. An outer arc-shaped feed hole is also provided around the boss. Therefore, when the raw material bar is extruded, the resistance at the periphery is less than that at the center, achieving a slower feed rate in the center and a faster feed rate at the periphery. Furthermore, an outer split-flow bridge forms an outer split-flow hole. Based on the structural design of the split-flow bridge and the split-flow hole, the flow rate and velocity of each part can be controlled more precisely and accurately. Therefore, the feeding effect is better, the profile forming degree is better, and high-quality production of profiles with a hollow center and a complex outer shape can be achieved. Attached Figure Description

[0016] Figure 1 This is a perspective structural diagram of the extrusion die provided by this utility model in the combined state of the upper and lower dies.

[0017] Figure 2 This is a cross-sectional structural diagram of the extrusion die provided by this utility model in the combined state of the upper and lower dies.

[0018] Figure 3 This is a schematic diagram of the material inlet side of the upper mold provided by this utility model.

[0019] Figure 4 This is a schematic diagram of the material discharge side of the upper mold provided by this utility model.

[0020] Figure 5 This is a schematic diagram of the cross-sectional shape of the profile produced by the extrusion die provided by this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Upper mold; 2. Lower mold; 3. Boss; 4. Central feed hole; 5. Outer arc-shaped feed hole; 6. Outer flow divider bridge; 7. Outer flow divider hole; 8. Mold core; 9. Block; 10. Central flow divider bridge; 11. Welding chamber; 12. Mold hole. Detailed Implementation

[0023] This utility model provides a pagoda-type split flow extrusion die, which solves the problem that existing extrusion dies are difficult to use for profiles with a hollow center and a complex outer shape. The new structural design allows for better control of the feed flow and split, resulting in the desired feeding effect of slow feed in the middle and fast feed at the periphery.

[0024] Please see Figures 1 to 4This utility model discloses a pagoda-type flow-dividing extrusion die, which is a flow-dividing combination die, including an upper die 1 and a lower die 2 that are installed together. The structures of the upper die 1 and the lower die 2 are matched so that they can jointly form the required internal cavity structure of the die and the discharge side structure that is consistent with the cross-sectional shape of the profile. A boss 3 is provided at the middle position of the feed side of the upper die 1, and a central feed hole 4 that runs through the feed direction is provided within the area of ​​the boss 3. On the feed side of the upper die 1, an outer arc-shaped feed hole 5 is provided around the boss 3, so that the outer arc-shaped feed hole 5 surrounds all the central feed holes 4. The feed side of the boss 3 is flush with or higher than the feed side of the outer arc-shaped feed hole 5. Multiple peripheral diversion bridges 6 are provided inside the outer arc-shaped feed hole 5. The feed side of the peripheral diversion bridge 6 is lower than the feed side of the outer arc-shaped feed hole 5. The peripheral diversion bridge 6 divides the discharge side of the outer arc-shaped feed hole 5 into multiple peripheral diversion holes 7, which are continuous along the feed direction. The height of the feed side is relative to the direction from feed to discharge. The higher part, or protruding part, will contact the feed first; the lower part, or sunken part, will contact the feed later.

[0025] There is usually a certain correspondence between the diameter of the raw material bar (e.g., aluminum bar), the size of the extrusion die, and the model of the extrusion press. For details, please refer to [reference needed]. Figure 3 When the raw material bar is fed into the extrusion die, it first contacts the feeding side of the upper die 1 concentrically. The outer edge dimension of the raw material bar is larger than the outer edge dimension of the boss 3. The middle part of the raw material bar corresponds to the boss 3 in the middle of the upper die 1, and the outer periphery of the raw material bar corresponds to the outer arc-shaped feeding hole 5. In some embodiments, the outer edge dimension of the raw material bar is less than or equal to the outer edge dimension of the outer arc-shaped feeding hole 5. Due to the presence of the boss 3, the middle part of the raw material bar will experience greater resistance, and the feed will be pushed from the middle to the periphery. Furthermore, the periphery is in the form of a through hole on the feeding side, and its feeding side does not have a flow divider bridge (the outer flow divider bridge 6 is recessed inside the outer arc-shaped feeding hole 5). Therefore, the feeding situation on the periphery will be significantly improved, ensuring the forming of the complex structure of the profile periphery.

[0026] In some embodiments, such as Figure 2 As shown ( Figure 2 (A schematic, hypothetical cross-sectional view is provided to show all major structural features.) The feed side of the boss 3 is flush with the feed side of the peripheral arc-shaped feed hole 5. The area surrounding the boss 3 is the peripheral diversion bridge 6 within the peripheral arc-shaped feed hole 5. The feed side of the boss 3 is higher than the feed side of the peripheral diversion bridge 6, thereby achieving the aforementioned technical effect. In other embodiments, the feed side of the boss 3 is higher than the feed side of the peripheral arc-shaped feed hole 5, making the diversion effect from the center to the periphery stronger. Optionally, there is a gap, a slope, or a step between the root of the boss 3 and the peripheral arc-shaped feed hole 5.

[0027] More specifically, typically, please also refer to Figure 5 ( Figure 5 The profile shown is specifically a corner column. The profile produced by the extrusion die of this invention has a U-shaped cross-section. The U-shaped structure includes two side walls and a bottom wall, and has a cavity on at least one side wall (the profile structure shown has cavities on both side walls and the bottom wall). The opening of the U-shaped structure is opposite to the bottom wall. A protruding die core 8 is provided on the discharge side of the upper die 1. The die core 8 corresponds to the cavity, and the outer surface of the die core 8 is a working zone, thereby forming a specific shape of the inner surface of the profile cavity.

[0028] It is understood that this utility model is not limited to the illustrated embodiments. For example, the profile may not be a U-shaped structure, but may have a top wall connected to form a tubular structure at the opening position in the figure, or the die hole may be in a shape other than square. As long as it is necessary to make the material feed on the outside much larger than the material feed in the middle, the solution of this utility model can be adopted.

[0029] Further, please refer to Figure 4 For U-shaped profiles, the size of the peripheral diversion holes 7 corresponding to the opening position (the two diversion holes located in the upper center position in the figure) is smaller than the size of the peripheral diversion holes 7 corresponding to the bottom wall position (the two diversion holes located in the lower center position in the figure). This allows for more material to be fed into the portion corresponding to the bottom wall (lower part), while the opening (upper part) is empty, thus requiring less material to be fed. This solution is particularly suitable for complex profiles with cavities in the bottom wall and cantilever structures on the outer side of the bottom wall.

[0030] More specifically, the central feed hole 4 corresponds to the interior of the U-shaped structure of the profile cross-section, and there are two peripheral arc-shaped feed holes 5, whose positions correspond to the two side walls on both sides. The two peripheral arc-shaped feed holes 5 are symmetrical or substantially symmetrical. On the side corresponding to the opening, there is a first gap between the two peripheral arc-shaped feed holes 5; on the side corresponding to the bottom wall, there is a second gap between the two peripheral arc-shaped feed holes 5. The first and second gaps form a flow-diverting bridge structure. (See also...) Figure 3 The first and second gaps enable the material feeding sides of the upper die 1 to be connected together, providing sufficient resistance to extrusion. It is conceivable that, in other embodiments, the outer arc-shaped material feeding hole 5 may also be selected as a single, three, four, or more arc-shaped section.

[0031] Further, please refer to Figure 4 , Figure 4 Equivalent to Figure 3The upper mold 1 is flipped over, and its discharge side is observed. A protruding blocking block 9 is present on the discharge side of the upper mold 1, extending from the first interval position to the middle position of the upper mold 1. The blocking block 9 is close to the inlet side of the lower mold 2. The structure of the blocking block 9 is wider than the bottom of a conventional flow divider bridge, and the blocking block 9 is used to block the material from entering the mold. See also... Figure 1 The blocking block 9 is adapted to the U-shaped structure. The material in the middle enters from the middle inlet hole 4. Due to the obstruction of the blocking block 9, it tends to flow outward, making the flow path clearer and smoother. This is conducive to controlling the flow rate in the inner area of ​​both side walls and forming a good welding effect. At the same time, since the lower mold 2 needs to open the mold hole of the U-shaped structure, the middle part will form a cantilever structure with three sides suspended. The blocking block 9 can also prevent a large amount of material from squeezing the middle part of the cantilever structure directly and prevent it from being crushed and deformed.

[0032] Preferably, the boss 3 is generally circular (such as cylindrical or frustum-shaped). On the feeding side of the upper mold 1, the edge contour lines of the two outer arc-shaped feeding holes 5 are concentric with the edge contour lines of the boss 3, so as to better match the cylindrical raw material bar.

[0033] Preferably, the boss 3 and the feed side of the peripheral diversion bridge 6 have a chamfer that gradually expands outward from the feed direction to the discharge direction (for the case where the root of the boss 3 is directly connected to the feed side of the peripheral diversion bridge 6, please refer to...). Figure 2 Alternatively, the boss 3 and the inlet side of the outer arc-shaped inlet hole 5 have a chamfer that gradually expands outward from the inlet to the outlet direction (for the case where the boss 3 is higher than the outer diversion bridge 6 and there is a gap between them on the inlet side, please refer to...). Figure 3 Chamfers, such as bevels or curved surfaces, have an outward-expanding structure that facilitates the outward flow of the feed material.

[0034] Preferably, there are multiple central feed holes 4, for example, four arranged in a grid pattern in the illustrated embodiment, with the multiple central feed holes 4 separated by a central flow divider 10. Providing multiple central feed holes 4 allows for individual adjustment of the size of each central feed hole 4, thereby enabling more precise control of the flow rate at the corresponding location. Furthermore, as... Figure 1 In the embodiment shown, each inlet hole and diversion hole on the discharge side is arranged in a ring around the U-shaped structure of the mold hole.

[0035] Preferably, it can be consulted at the same time. Figure 1 , Figure 2 The outer arc-shaped feed hole 5 is an inclined hole that gradually expands outward from the feed direction to the discharge direction, and / or the outer diversion hole 7 is an inclined hole that gradually expands outward from the feed direction to the discharge direction. The inclined hole structure is more conducive to expanding the feed outward beyond the diameter of the raw material bar, and is more suitable for forming profiles with complex outer structures and large cross-sectional dimensions.

[0036] As a more specific supplement, after the extrusion die assembly, the lower die 2 is installed on the discharge side of the upper die 1. The lower die 2 is provided with a welding chamber 11, and a through die hole 12 is provided in the welding chamber 11. The die hole 12 is consistent with the outer contour of the profile cross-section, and the die core 8 is located in the die hole 12. Preferably, the discharge side of the lower die 2 has four-stage empty grooves to avoid surface extrusion marks and extrusion lines caused by friction between the profile and the die during discharge.

[0037] In summary, the pagoda-shaped flow-controlled extrusion die of this invention features a central through-hole as a central feed hole, with the feed side of the central feed hole protruding and relatively higher than its surrounding surfaces. This type of boss structure can be intuitively described as pagoda-shaped. An outer arc-shaped feed hole is also provided around the boss. Therefore, when the raw material bar is extruded, the resistance at the periphery is less than that at the center, achieving a slower feed rate in the center and a faster feed rate at the periphery. Furthermore, an outer flow-dividing bridge forms an outer flow-dividing hole. Based on the structural design of the flow-dividing bridge and flow-dividing hole, the flow rate and velocity of each part can be controlled more precisely and accurately. Therefore, the feeding effect is better, the profile forming degree is better, and high-quality production of profiles with a hollow center and a complex outer shape can be achieved.

[0038] 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, 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; for ease of description, only the parts related to the utility model are shown in the accompanying drawings. 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. A conical flow control extrusion die comprising an upper die (1) and a lower die (2) mounted in cooperation, characterized in that, A boss (3) is provided at the middle position of the feed side of the upper mold (1), and a central feed hole (4) is provided within the range of the boss (3) and runs through the feed direction; on the feed side of the upper mold (1), an outer arc-shaped feed hole (5) is provided around the boss (3), and the feed side of the boss (3) is flush with or higher than the feed side of the outer arc-shaped feed hole (5); multiple outer diversion bridges (6) are provided inside the outer arc-shaped feed hole (5), and the feed side of the outer diversion bridge (6) is lower than the feed side of the outer arc-shaped feed hole (5). The outer diversion bridge (6) divides the discharge side of the outer arc-shaped feed hole (5) into multiple outer diversion holes (7), and the outer diversion holes (7) run through the feed direction.

2. The conical flow control extrusion die of claim 1, wherein, The profiles produced by it have a U-shaped cross-section. The U-shaped structure includes two side walls and a bottom wall, and has a cavity on at least one side wall. The opening of the U-shaped structure is opposite to the bottom wall. The upper mold (1) has a protruding mold core (8) on the discharge side, and the mold core (8) is opposite to the cavity.

3. The conical flow control extrusion die of claim 2, wherein, The size of the peripheral diversion hole (7) corresponding to the opening position is smaller than the size of the peripheral diversion hole (7) corresponding to the bottom wall position.

4. The conical flow control extrusion die of claim 2, wherein, The position of the central feed hole (4) corresponds to the interior of the U-shaped structure of the profile cross-section; there are two peripheral arc feed holes (5), and the positions of the two peripheral arc feed holes (5) correspond to the two side walls on both sides; on the side corresponding to the opening, there is a first interval between the two peripheral arc feed holes (5); on the side corresponding to the bottom wall, there is a second interval between the two peripheral arc feed holes (5).

5. The conical flow control extrusion die of claim 4, wherein, The upper mold (1) has a protruding blocking block (9) on the discharge side, the blocking block (9) extending from the first interval position to the middle position of the upper mold (1).

6. The inverted truncated cone flow control extrusion die of claim 2, wherein, On the feeding side of the upper mold (1), the edge contour lines of the two outer arc-shaped feeding holes (5) are concentric with the edge contour lines of the boss (3).

7. The conical flow control extrusion die according to any one of claims 1 to 6, wherein The boss (3) and the feed side of the outer diversion bridge (6) have a chamfer that gradually expands outward from the feed direction to the discharge direction, or the boss (3) and the feed side of the outer arc-shaped feed hole (5) have a chamfer that gradually expands outward from the feed direction to the discharge direction.

8. The inverted truncated cone flow control extrusion die of any one of claims 1-6, wherein, There are multiple central feed holes (4), and the multiple central feed holes (4) are separated by a central flow bridge (10).

9. The inverted truncated cone flow control extrusion die of any one of claims 1-6, wherein, The outer arc-shaped feed hole (5) is an inclined hole that gradually expands outward from the feed direction to the discharge direction, and / or the outer diversion hole (7) is an inclined hole that gradually expands outward from the feed direction to the discharge direction.

10. The inverted truncated cone flow control extrusion die of any one of claims 1-6, wherein, The lower mold (2) is provided with a welding chamber (11), and a through mold hole (12) is provided in the welding chamber (11).

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