A partial funnel flow extrusion die

Abstract

This utility model discloses a funnel-shaped flow-dividing extrusion die, including an upper die and a lower die. The upper die has adjacent small and large die cores on the discharge side. Multiple through-flow holes are provided on the upper die, including a funnel-shaped hole. The inlet size of the funnel-shaped hole is larger than the outlet size. The outlet of the funnel-shaped hole is offset towards the side closer to the small die core, relative to the center of its inlet area. The outlet of the funnel-shaped hole is located between the small and large die cores, and its area partially overlaps with the large die core, while the small die core is outside its outlet area. This utility model uses a funnel-shaped flow-dividing hole between the die cores, with a large inlet and a small outlet, thereby reducing the flow velocity in the middle while ensuring material intake, reducing the pressure on the small die core, protecting it from swaying, and ensuring the profile wall thickness meets requirements.

Description

Technical Field

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

[0002] In the profile extrusion process, when the die has a small core, the core is prone to wobble under pressure, resulting in an unsatisfactory wall thickness in the produced profile. Furthermore, due to the unstable deformation of the small core, there is a significant difference in wall thickness. Especially when both large and small cores are present and adjacent to each other, feeding material only from the outer side can cause the small core to wobble inward and create a dead zone between the cores. Conversely, if sufficient material is fed into the space between the cores, the small core tends to wobble outward. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a funnel-type extrusion die, which solves the problem that the small die core in the existing extrusion die is prone to swaying, resulting in unsatisfactory profile wall thickness.

[0004] According to the technical solution of this utility model, this utility model provides a funnel-shaped extrusion die, including an upper die and a lower die. The upper die is provided with adjacent small die cores and large die cores on the discharge side. The upper die is provided with multiple through-flow holes, including a funnel-shaped hole. The size of the inlet of the funnel-shaped hole is larger than the size of the outlet of the funnel-shaped hole. Relative to the center of the range of the inlet of the funnel-shaped hole, the outlet of the funnel-shaped hole is biased towards the side closer to the small die core. The outlet of the funnel-shaped hole is located between the small die core and the large die core. The range of the outlet of the funnel-shaped hole partially overlaps with the large die core, and the small die core is located outside the range of the outlet of the funnel-shaped hole.

[0005] In some embodiments, the funnel-shaped orifice has a straight section on the inlet side and gradually narrows on the outlet side.

[0006] In some embodiments, the flow divider also includes multiple outer flow dividers, with the funnel-shaped hole located in the middle of the upper mold and the outer flow dividers located around the funnel-shaped hole.

[0007] In some embodiments, the feed side of the upper mold is gradually recessed from the outer diversion hole to the funnel-shaped hole.

[0008] In some embodiments, the cross-sectional shape of the produced profile includes adjacent small cavities and large cavities, with the small cavities and large cavities corresponding to small mold cores and large mold cores, respectively; the outer sides of the small cavities and large cavities are thick-walled structures.

[0009] In some implementations, protruding flow-blocking blocks are provided on all sides of the large mold core except for the side of the large mold core that is close to the small mold core.

[0010] In some embodiments, the small mold core has a protruding flow-blocking block on the side away from the large mold core.

[0011] In some embodiments, the lower die is provided with a recessed welding chamber, and a die hole extending from the inlet side to the outlet side is provided in the welding chamber. The outline of the die hole is consistent with the outer outline of the cross-sectional shape of the produced profile. A flow-blocking strip protruding towards the inlet side is provided in the welding chamber, and the flow-blocking strip is arranged around the outline of the die hole.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows: The present invention relates to a funnel-shaped diversion die for extrusion, which uses a funnel-shaped diversion hole between the die cores, with a large inlet and a small outlet. This reduces the flow rate in the middle while ensuring material feeding, reduces the pressure on the small die core, protects the small die core from swaying, and thus ensures that the wall thickness of the profile meets the requirements. Attached Figure Description

[0013] Figure 1 This is a perspective structural diagram of the upper and lower molds combined according to the present invention.

[0014] Figure 2 This is a cross-sectional view of the combined upper and lower molds provided by this utility model.

[0015] Figure 3 This is a schematic diagram of a typical profile cross-sectional shape provided by this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Upper mold; 11. Small mold core; 12. Large mold core; 13. Offset funnel-shaped hole; 14. Outer diversion hole; 15. Large mold core flow barrier; 16. Small mold core flow barrier; 2. Lower mold; 21. Welding chamber; 22. Mold hole; 23. Flow barrier strip; 31. Small cavity; 32. Large cavity; 33. Thick-walled structure. Detailed Implementation

[0017] This invention provides a funnel-type extrusion die that solves the problem of unsatisfactory profile wall thickness caused by the easy swaying of the small die core in existing extrusion dies.

[0018] Please see Figures 1 to 3This utility model discloses a funnel-shaped extrusion die, comprising an upper die 1 and a lower die 2, which is a flow-dividing combination die. The upper die 1 has adjacent small die cores 11 and large die cores 12 (with an discharge gap between them) on the discharge side to form adjacent cavity structures in the profile. The upper die 1 has multiple flow-dividing holes extending from the inlet side to the outlet side. Each flow-dividing hole includes a funnel-shaped hole 13. The size of the inlet of the funnel-shaped hole 13 is larger than the size of its outlet. Furthermore, relative to the center of the inlet area of ​​the funnel-shaped hole 13, the outlet of the funnel-shaped hole 13 is biased towards the side closer to the small die core 11. The outlet of the funnel-shaped hole 13 is located between the small die core 11 and the large die core 12, and the area of ​​the outlet of the funnel-shaped hole 13 partially overlaps with that of the large die core 12. The small die core 11 is located outside the area of ​​the outlet of the funnel-shaped hole 13.

[0019] Specifically, such as Figure 1 In the structure shown, the small mold core 11 is located above the large mold core 12. The inlet of the funnel-shaped hole 13 is roughly located in the middle of the upper mold 1 and basically covers the area of ​​the small mold core 11 and the large mold core 12. The outlet of the funnel-shaped hole 13 is relatively higher and connected to the outlet gap between the small mold core 11 and the large mold core 12, thus forming a funnel structure with the outlet biased to one side. The inlet of the funnel-shaped hole 13 is relatively large to ensure material feeding between the mold cores, while the outlet is smaller to prevent the small mold core 11 from being subjected to excessive pressure and swaying. From the perspective of orthographic projection, the discharge port range of the funnel-shaped hole 13 is mostly located within the range of the large mold core 12. The large mold core 12 is mainly used to ensure the setting of the funnel-shaped hole 13 and the overall structural strength (the part above the material inlet side of the working belt of the large mold core 12 forms a side wall structure that is more than half the overall size of the funnel-shaped hole 13). The discharge port has basically no overlap with the small mold core 11, ensuring the integrity and structural strength of the smaller mold core 11.

[0020] Furthermore, such as Figure 2 As shown, the funnel-shaped hole 13 has a straight hole on the inlet side and gradually narrows on the outlet side. In this way, the straight hole ensures the inlet first, and then the hole diameter gradually narrows and the flow is guided to the position between the mold cores.

[0021] More specifically, the flow divider also includes multiple outer flow dividers 14, with the funnel-shaped hole 13 located in the middle of the upper mold 1, and the outer flow dividers 14 surrounding the funnel-shaped hole 13. The material fed into the funnel-shaped hole 13 and the outer flow dividers 14 on both sides of the small mold core 11 will apply pressure to both sides of the small mold core 11 respectively. By balancing the forces on both sides during the mold design stage, the stability of the small mold core 11 can be further guaranteed.

[0022] Preferably, the feed side of the upper die 1 is gradually concave from the outer diversion hole 14 to the funnel-shaped hole 13, which can play a pressure relief role. During extrusion, the edge of the raw material bar first contacts the upper die 1 and flows towards the center under the action of the concave surface, reducing the pressure on the center and relatively increasing the feed in the center.

[0023] Please see Figure 3 The profiles (connectors) produced by the manufacturer include adjacent small cavities 31 and large cavities 32 in their cross-sectional shape. The small cavities 31 and large cavities 32 correspond to the small mold core 11 and the large mold core 12, respectively. Specifically, the small cavity 31 consists of two parallel circular holes, with a curved structure between it and the large cavity 32. The outer sides of the small cavity 31 and the large cavity 32 are thick-walled structures 33. The thick-walled structure 33 is a relatively thick solid structure, and its dimensions are larger than the thin wall between the small cavity 31 and the large cavity 32.

[0024] More preferably, except for the side of the large mold core 12 closest to the small mold core 11, protruding large mold core flow-blocking blocks 15 are provided on the other sides of the large mold core 12. For example... Figure 1 In the embodiment shown, the large mold core flow blocking block 15 surrounds the left, lower, and right sides of the large mold core 12. The orthographic projection range of the large mold core flow blocking block 15 corresponds to and is located within the thick-walled structure 33. This allows the material feed in the middle to radiate outwards, reduces the space between the large mold core 12 and the lower mold 2, and guides the raw material into the mold hole, thereby ensuring the material supply of the thick-walled structure 33 of the profile and avoiding the problem of hollow thick-walled structure 33 in the produced profile.

[0025] More preferably, the small mold core 11 has a protruding small mold core flow-blocking block 16 on its side away from the large mold core 12. For example... Figure 1 In the illustrated embodiment, the small mold core flow-blocking block 16 is located on the upper side (more specifically, the obliquely upper side) of the small mold core 11. The area above the small cavity 31 is close to the edge of the profile and requires less raw material. Therefore, the small mold core flow-blocking block 16 allows more raw material to flow to both sides. Simultaneously, the small mold core flow-blocking block 16 increases the thickness of the small mold core 11 and its ability to resist lateral pressure, further contributing to the stability of the small mold core 11. In the illustrated embodiment, the large mold core flow-blocking block 15 and the small mold core flow-blocking block 16 are simultaneously provided.

[0026] As a supplementary explanation, the lower mold 2 is provided with a recessed welding chamber 21, and a die hole 22 is provided in the welding chamber 21, which runs from the material inlet side to the material outlet side. The outline of the die hole 22 is consistent with the outer outline of the cross-sectional shape of the produced profile. The structure of the lower mold 2 corresponds to the upper mold 1 and the cross-sectional shape of the profile. Its specific structural design can refer to the prior art and is not the focus of the improvement of this utility model, so it will not be described in detail here.

[0027] Preferably, a flow-blocking band 23 protruding towards the material inlet is provided in the welding chamber 21. The flow-blocking band 23 is arranged around the contour of the die hole 22. This can adjust the overall material flow rate of the profile cross-section to match, and further ensure the forming effect of the thick-walled structure 33.

[0028] In summary, the funnel-shaped diversion die of this invention uses a funnel-shaped diversion hole between the die cores, with a large inlet and a small outlet. This reduces the flow rate in the middle while ensuring material feeding, reduces the pressure on the small die core, protects the small die core from swaying, and thus ensures that the wall thickness of the profile meets the requirements.

Claims

1. A flow-by extrusion die with a biasing funnel, comprising an upper die (1) and a lower die (2), characterized in that, The upper mold (1) has adjacent small mold cores (11) and large mold cores (12) on the discharge side. The upper mold (1) has multiple through-holes, including a funnel-shaped hole (13). The size of the inlet of the funnel-shaped hole (13) is larger than the size of the outlet of the funnel-shaped hole (13). Relative to the center of the range of the inlet of the funnel-shaped hole (13), the outlet of the funnel-shaped hole (13) is biased towards the side closer to the small mold core (11). The outlet of the funnel-shaped hole (13) is located between the small mold core (11) and the large mold core (12). The range of the outlet of the funnel-shaped hole (13) partially overlaps with the large mold core (12). The small mold core (11) is located outside the range of the outlet of the funnel-shaped hole (13).

2. The partial funnel flow extrusion die of claim 1, wherein, The funnel-shaped hole (13) has a straight section on the feed side and gradually narrows on the discharge side.

3. The partial funnel flow extrusion die of claim 1 wherein, The flow divider also includes multiple outer flow dividers (14), with the funnel-shaped hole (13) located in the middle of the upper mold (1) and the outer flow dividers (14) located around the funnel-shaped hole (13).

4. The flow by offset funnel extrusion die of claim 3 wherein, The material feeding side of the upper mold (1) gradually concave from the outer diversion hole (14) to the funnel-shaped hole (13).

5. The funnel-shaped flow extrusion die according to any one of claims 1-4, characterized in that, The profiles produced include adjacent small cavities (31) and large cavities (32), with the small cavity (31) and large cavity (32) corresponding to the small mold core (11) and large mold core (12) respectively; the outer side of the small cavity (31) and large cavity (32) is a thick-walled structure (33).

6. The flow by offset funnel extrusion die of claim 5 wherein, Except for the side of the large mold core (12) that is close to the small mold core (11), protruding large mold core flow blocking blocks (15) are provided on the other sides of the large mold core (12).

7. The flow by offset funnel extrusion die of claim 5 wherein, The small mold core (11) has a protruding small mold core flow blocking block (16) on the side away from the large mold core (12).

8. The flow by offset funnel extrusion die of claim 5 wherein, The lower mold (2) is provided with a recessed welding chamber (21). A mold hole (22) is provided in the welding chamber (21) that runs from the material inlet side to the material outlet side. The outline of the mold hole (22) is consistent with the outer outline of the cross-sectional shape of the profile produced. A flow-blocking strip (23) protruding towards the material inlet side is provided in the welding chamber (21). The flow-blocking strip (23) is arranged around the outline of the mold hole (22).

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