Extrusion die capable of partially adjusting flow velocity

Abstract

The utility model discloses a partial flow velocity adjusting type extrusion die. The partial flow velocity adjusting type extrusion die comprises an upper die and a lower die, a cavity is formed in the section shape of the produced profile, and a corner part is formed at the included angle of two side edges, close to the outside, of the cavity; the upper die is provided with a plurality of flow dividing holes, and the position corresponding to the position close to the corner is a first-stage flow dividing hole. The interior of the first-stage flow dividing hole is divided into three second-stage flow dividing holes on the discharging side through two sinking bridges, and the three second-stage flow dividing holes are the corner flow dividing hole corresponding to the corner, and the first side edge flow dividing hole and the second side edge flow dividing hole corresponding to the two side edges of the corner respectively. The first-stage flow dividing holes are inclined holes which are gradually inclined outwards in the direction from feeding to discharging; and a convex mold core is arranged on the discharging side of the upper mold and corresponds to the mold hole. According to the scheme, the flow speed can be adjusted in a specific part position in a targeted mode, so that the feeding condition is optimized, the finally produced sectional material is good in forming effect, the angle position and angle are ideal, and the two sides are straight and free of deformation.

Description

Partially adjustable flow rate extrusion dies Technical Field

[0001] This utility model belongs to the field of extrusion die technology, and specifically relates to a partially variable flow rate extrusion die. Background Technology

[0002] For profiles with large cross-sectional cavities, thin walls, and angles between adjacent sides of the cavity, traditional extrusion die designs, such as the structure shown in Chinese invention patent application CN105414232A, employ a symmetrical design for the corners. Specifically, the die has flow-diverting holes on both sides, with a flow-diverting bridge at the corner apex, allowing material to be fed from both sides to the central corner. However, in actual production, this symmetrical design has been found unsuitable for certain profiles (e.g., as shown in Figure 4). The sides at the corner become deformed and uneven, and the angle is not ideal. The problem lies in the suboptimal material supply at the upper right corner, and existing solutions struggle to adjust the flow rate at this location by modifying the die shape, such as the flow-diverting holes. Therefore, a novel extrusion die structure is needed. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a partially adjustable flow rate extrusion die, which solves the problem of poor material supply to the corners of large thin-walled profiles by existing extrusion dies, resulting in profile deformation. It enables more targeted adjustment of the flow rate at the corners, producing profiles with good forming effect, ideal corner position and angle, and straight sides without deformation.

[0004] According to the technical solution of this utility model, this utility model provides a partially variable flow rate extrusion die, including an upper die and a lower die that are installed together. The lower die has a die hole that matches the outer contour of the cross-sectional shape of the profile being produced. The cross-sectional shape of the profile being produced has a cavity, and the included angle of the two outermost sides of the cavity forms a corner. The part of the die hole corresponding to the corner is located near the outer edge of the lower die. The upper die has multiple diversion holes, among which the diversion hole corresponding to the position near the corner is a primary diversion hole. The primary diversion hole is divided into three secondary diversion holes on the discharge side by two countersunk bridges, namely the corner diversion hole corresponding to the corner and the first side diversion hole and the second side diversion hole corresponding to the two sides of the corner. The primary diversion hole is an inclined hole that gradually slopes outward from the material inlet to the material outlet. The upper die has a protruding die core on the discharge side, and the die core corresponds to the die hole.

[0005] In some embodiments, the inner sidewall of the primary diversion hole is a transition slope; the inner edge of the feed side of the primary diversion hole is connected to the inner edge of the feed side of the corner diversion hole, the first side diversion hole, and the second side diversion hole through the transition slope.

[0006] In some implementations, all the flow-diverting holes in the upper mold except for the primary flow-diverting holes are ordinary flow-diverting holes, and there are ordinary flow-diverting bridges between the ordinary flow-diverting holes.

[0007] In some embodiments, on the discharge side of the upper die, ordinary diversion holes and corner diversion holes, first side diversion holes and second side diversion holes are arranged along the outer contour of the cross-sectional shape of the produced profile.

[0008] In some embodiments, the lengths of the two sides on both sides of the corner of the produced profile are 1 / 2 to 2 / 3 of the overall length of the cross-sectional shape of the produced profile.

[0009] In some embodiments, the cross-sectional shape of the produced profile is U-shaped, and the middle position of the cross-sectional shape of the produced profile corresponds to the middle position of the upper die and the middle position of the lower die. The material inlet side of the middle of the upper die is concave downward.

[0010] In some embodiments, the lower die has a recessed welding chamber on the inlet side, and the die hole is located inside the welding chamber; the die hole has a hollow groove on the outlet side.

[0011] In some embodiments, a die pad is also installed and connected on the discharge side of the lower die. The die pad has a through die pad hole, the range of which is larger than the range of the discharge side of the empty knife groove.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] This utility model's partially adjustable flow rate extrusion die breaks through the existing symmetrical design method for forming the corners of profiles. It forms a large primary flow divider hole that is further divided into three holes, with the middle hole corresponding to the corner. This solution allows for targeted adjustment of the flow rate at specific locations to optimize the material supply, resulting in a profile with good forming effect, ideal corner position and angle, and straight sides without deformation. Attached Figure Description

[0014] Figure 1 is a perspective structural diagram of the extrusion die provided by this utility model in the assembled state.

[0015] Figure 2 is a schematic diagram of the material inlet side of the upper mold provided by this utility model.

[0016] Figure 3 is a cross-sectional view of the extrusion die provided by this utility model in its assembled state.

[0017] Figure 4 is a schematic diagram of the cross-sectional shape of the profile produced by the extrusion die provided by this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Upper mold; 11. Primary flow divider hole; 12. Recessed bridge; 13. Corner flow divider hole; 14. First side flow divider hole; 15. Second side flow divider hole; 16. Mold core; 17. Transition slope; 18. Ordinary flow divider hole; 19. Ordinary flow divider bridge; 2. Lower mold; 21. Mold hole; 22. Welding chamber; 23. Empty knife groove; 31. Cavity; 32. Corner; 4. Mold pad; 41. Mold pad through hole. Detailed Implementation

[0020] This utility model provides a partially adjustable flow rate extrusion die, which solves the problem of poor material supply to the corners of large thin-walled profiles by existing extrusion dies, resulting in profile deformation. It enables more targeted adjustment of the flow rate at the corners, producing profiles with good forming effect, ideal corner position and angle, and straight sides without deformation.

[0021] Please refer to Figure 4. This invention relates to a partially variable flow rate extrusion die. The profile produced has a cavity 31 in its cross-sectional shape, and a corner 32 is formed at the included angle of the two outermost sides of the cavity 31. The cross-sectional shape has a relatively large length dimension, and the portion of the die hole 21 corresponding to the corner 32 is located near the outer edge of the lower die 2. Because the two sides of the corner 32 are relatively long and the corner 32 is far from the center, this type of profile is prone to deformation at this location.

[0022] Figures 1 to 3 show that the extrusion die of this invention is a flow-dividing combination die, including an upper die 1 and a lower die 2 that are fitted together. The lower die 2 has a die hole 21 that matches the outer contour of the cross-sectional shape of the profile being produced. The upper die 1 has multiple flow-dividing holes, among which the primary flow-dividing hole 11 is located near the corner 32. In this embodiment, the size of the primary flow-dividing hole 11 is larger than the other flow-dividing holes. Within the primary flow-dividing hole 11, three secondary flow-dividing holes are formed on the discharge side by two countersunk bridges 12, namely, a corner flow-dividing hole 13 corresponding to the corner 32, and a first side flow-dividing hole 14 and a second side flow-dividing hole 15 corresponding to the two sides of the corner 32. The difference between the submerged bridge 12 and a regular diverter bridge is that its inlet side is much lower than the inlet side of the diverter hole, thus creating a through-hole within a certain depth range on the inlet side of the primary diverter hole 11. This allows the material to flow within the primary diverter hole 11 with relatively low resistance before contacting the internal submerged bridge 12 for diversion. This results in more sufficient flow velocity and flow rate in the corner diverter hole 13, the first side diverter hole 14, and the second side diverter hole 15, and facilitates control of the flow velocity through adjustments to the shape and size of the diverter holes, thereby improving the forming effect at the corners of the profile. The primary diverter hole 11 is an inclined hole that gradually slopes outwards from the inlet to the outlet direction, thus guiding the material to the outer side. The upper mold 1 has a protruding mold core 16 on the outlet side, which corresponds to the mold hole 21. The end of the die core 16 has a working strip, which is consistent with the inner contour of the cavity 31. After the extrusion die is assembled, the working strip of the die core 16 is located in the die hole 21, together forming the cross-sectional shape of the produced profile.

[0023] Further, referring to Figures 2 and 3, the inner sidewall of the primary diversion orifice 11 is a transition slope 17. The inner edge of the feed side of the primary diversion orifice 11 is connected to the inner edge of the feed side of the corner diversion orifice 13, the first side diversion orifice 14, and the second side diversion orifice 15 through the transition slope 17. The feed can be guided along the transition slope 17, better expand outward, and finally divert into the three secondary diversion orifices.

[0024] In the illustrated embodiment, all the diversion holes in the upper mold 1 except for the primary diversion hole 11 are ordinary diversion holes 18. The ordinary diversion holes 18 are generally through holes, but can be designed as angled holes depending on the situation. Ordinary diversion bridges 19 connect the ordinary diversion holes 18. The biggest difference between the ordinary diversion holes 18 and the primary diversion holes 11 is that the ordinary diversion holes 18 do not have a counterbridge. An ordinary diversion hole 18 is one hole on the inlet side and also one hole on the outlet side. As shown in Figure 1, on the outlet side of the upper mold 1, the ordinary diversion holes 18, the corner diversion holes 13, the first side diversion holes 14, and the second side diversion holes 15 are arranged along the outer contour of the cross-sectional shape of the produced profile; in other words, they form a ring based on the outer contour.

[0025] More specifically, as shown in Figure 4, in the cross-sectional shape of the produced profile, the lengths of the two sides on both sides of the corner 32 each account for 1 / 2 to 2 / 3 of the overall length of the cross-sectional shape of the produced profile. This structure with longer sidewalls is particularly suitable for this design. The cross-sectional shape of the produced profile is U-shaped (inverted U-shape in the figure). The middle position of the cross-sectional shape of the produced profile corresponds to the middle position of the upper mold 1 and the middle position of the lower mold 2. The feed side of the middle part of the upper mold 1 is concave downwards. The profile structure has a denser profile in the middle, so it is necessary to ensure material supply. In addition, since the U-shaped die hole 1 of the lower mold 2 has a cantilever structure with three sides suspended, the concave feed side can reduce the pressure in the middle, thereby preventing the cantilever structure from being crushed and deformed. The profile shown in Figure 4 is a curtain wall window decoration material. On the other side of the cavity 31 that forms the corner 32, there is another cavity. The upper parts of the two cavities are flush to form a large span (length), and the upper parts of the two cavities also have protruding support arms. One of the support arms is close to the corner 32, so the material supply and forming of the corner 32 and the nearby structure have higher requirements.

[0026] Preferably, referring to Figure 3 (a schematic hypothetical cross-sectional view to show the main structural features), the lower die 2 has a recessed welding chamber 22 on the inlet side, and the die hole 21 is located in the welding chamber 22. The die hole 21 has a cutter groove 23 on the outlet side, specifically, for example, a three-stage cutter groove; a die pad 4 is also installed and connected on the outlet side of the lower die 2, the die pad 4 has a through die pad hole 41, the range of the die pad hole 41 is larger than the range of the cutter groove 23 on the outlet side; to avoid the surface extrusion marks and extrusion lines caused by friction between the profile and the die during the extrusion, and the die pad 4 preferably has a cooling structure, such as a cooling water channel, around the die pad hole 41 to cool the profile in a timely manner.

[0027] In summary, the partially variable flow rate extrusion die of this utility model breaks through the symmetrical design method of existing dies in the forming of profile corners. It forms a large primary flow divider hole, which is further divided into three holes, with the middle hole corresponding to the corner. This solution is conducive to targeted adjustment of the flow rate at specific locations to optimize the material supply. The final produced profile has a good forming effect, with ideal corner position and angle, and straight sides without deformation.

Claims

1. A partially variable flow rate extrusion die, characterized in that, The system includes an upper mold (1) and a lower mold (2) that are installed together. The lower mold (2) has a mold hole (21) that matches the outer contour of the cross-sectional shape of the profile being produced. The cross-sectional shape of the profile being produced has a cavity (31), and the included angle of the two outer sides of the cavity (31) forms a corner (32). The part of the mold hole (21) corresponding to the corner (32) is located near the outer edge of the lower mold (2). The upper mold (1) has multiple diversion holes, of which the diversion hole is a first-level diversion hole at the position corresponding to the corner (32). The flow hole (11) is divided into three secondary flow holes on the discharge side by two sinkers (12) in the primary flow hole (11), namely the corner flow hole (13) corresponding to the corner (32) and the first side flow hole (14) and the second side flow hole (15) corresponding to the two sides of the corner (32); the primary flow hole (11) is an inclined hole that gradually slopes outward from the direction of material input to material output; the upper mold (1) has a protruding mold core (16) on the discharge side, and the mold core (16) corresponds to the mold hole (21).

2. The partially variable flow rate extrusion die according to claim 1, characterized in that, The inner sidewall of the primary diversion hole (11) is a transition slope (17); the inner edge of the feed side of the primary diversion hole (11) is connected to the inner edge of the feed side of the corner diversion hole (13), the first side diversion hole (14) and the second side diversion hole (15) through the transition slope (17).

3. The partially variable flow rate extrusion die according to claim 1, characterized in that, Except for the primary diversion hole (11), all other diversion holes in the upper mold (1) are ordinary diversion holes (18), and there are ordinary diversion bridges (19) between the ordinary diversion holes (18).

4. The partially variable flow rate extrusion die according to claim 3, characterized in that, On the discharge side of the upper mold (1), the ordinary diversion hole (18), the corner diversion hole (13), the first side diversion hole (14), and the second side diversion hole (15) are set along the outer contour of the cross-sectional shape of the produced profile.

5. The partially variable flow rate extrusion die according to claim 1, characterized in that, In the cross-sectional shape of the produced profile, the length of the two sides on both sides of the corner (32) accounts for 1 / 2 to 2 / 3 of the overall length of the cross-sectional shape of the produced profile.

6. The partially variable flow rate extrusion die according to claim 5, characterized in that, The profile produced has a concave cross-sectional shape. The middle position of the cross-sectional shape of the profile produced corresponds to the middle position of the upper mold (1) and the middle position of the lower mold (2). The material inlet side of the middle part of the upper mold (1) is concave downward.

7. The partially variable flow rate extrusion die according to any one of claims 1-6, characterized in that, The lower die (2) has a recessed welding chamber (22) on the material inlet side, and the die hole (21) is located inside the welding chamber (22); the die hole (21) has a hollow knife groove (23) on the material outlet side.

8. The partially variable flow rate extrusion die according to claim 7, characterized in that, A die pad (4) is also installed and connected on the discharge side of the lower die (2). The die pad (4) has a through die pad hole (41). The range of the die pad hole (41) is larger than the range of the discharge side of the empty knife groove (23).

Images