Extrusion die

Abstract

This utility model relates to the field of profile extrusion technology, specifically to an extrusion die, including an upper die and a lower die that close together. The lower die has a welding chamber, and the bottom of the welding chamber has a storage chamber, so that a boss is formed at the connection between the discharge port of the lower die and the welding chamber. This utility model adds a storage chamber to the welding chamber of the lower die, using the storage chamber to assist the welding chamber in balancing the metal flow rate and pressure. This structural design can reduce the required height of the welding chamber while meeting the same profile production requirements, thus shortening the contact time between the metal and the die core and improving the die's service life.

Description

Technical Field

[0001] This utility model relates to the field of profile extrusion technology, and in particular to an extrusion die. Background Technology

[0002] Hollow profiles are widely used in aluminum alloy extrusion, and their production relies on the assembly and welding of the upper and lower die cores of the flow divider. This process places extremely high demands on weld quality, metal flow rate, and pressure balance, requiring sufficient weld height to ensure this, especially in the production of anodized materials, thick-walled hollow profiles, high-precision wall thickness requirements, or profiles with large pressure-bearing cavities. Traditional methods improve weld quality and balance flow rate and pressure by increasing the height of the weld chamber, but... Figure 1 As shown, an increase in the height of the welding chamber leads to an increase in the mold volume, meaning a greater amount of metal inside. Since the speed of the extrusion rod in the extrusion equipment remains constant, the extrusion pressure and the overall stress of the mold increase accordingly. Simultaneously, with the increase in the height of the welding chamber, the contact time between the metal and the mold core lengthens, resulting in increased frictional heat. This temperature rise in the mold core causes a decrease in the material's yield strength, making the mold core more prone to plastic strain and thus shortening the mold life. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an extrusion die that, while meeting production requirements, can reduce the height of the welding chamber to improve the service life of the die.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an extrusion die, comprising an upper die and a lower die that are mutually clamped; the lower die is provided with a welding chamber, and the bottom of the welding chamber is provided with a material storage chamber, so that a boss is formed at the connection between the discharge port of the lower die and the welding chamber.

[0005] Furthermore, the width of the boss is 6mm to 12mm.

[0006] Furthermore, the end face of the boss facing the storage chamber is a slope.

[0007] Furthermore, the angle of the slope is 30° to 45°.

[0008] Furthermore, the upper mold is provided with multiple diversion holes that communicate with the welding chamber.

[0009] Furthermore, the upper mold is provided with a flow divider bridge corresponding to the flow divider hole, and the welding angle of the flow divider bridge is 26° to 40°.

[0010] Furthermore, the number of diversion holes is 2 to 5.

[0011] Furthermore, the height of the welding chamber is 6mm to 20mm.

[0012] The beneficial effects of this invention are as follows: By adding a material storage chamber to the welding chamber of the lower mold, the material storage chamber assists the welding chamber in balancing the metal flow rate and pressure. This structural design can reduce the required height of the welding chamber while meeting the production requirements of the same profile, thereby shortening the contact time between the metal and the mold core and improving the service life of the mold. Attached Figure Description

[0013] Figure 1 A graph showing the relationship between the maximum stress of the mold, the extrusion pressure, and the height of the welding chamber;

[0014] Figure 2 This is a schematic cross-sectional view of an extrusion die in its closed state, as proposed in this utility model.

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the upper die of an extrusion die proposed in this utility model;

[0016] Figure 4 This is a schematic diagram of the lower die cross-sectional structure of an extrusion die proposed in this utility model;

[0017] Label Explanation:

[0018] 1. Upper mold; 11. Diverter hole; 12. Diverter bridge;

[0019] 2. Lower mold; 21. Welding chamber;

[0020] 3. Storage chamber; 4. Boss; 5. Mold core. Detailed Implementation

[0021] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0022] Please refer to Figures 2 to 4 As shown, this utility model discloses an extrusion die, including an upper die 1 and a lower die 2 that are mutually clamped; the lower die 2 is provided with a welding chamber 21, and the bottom of the welding chamber 21 is provided with a material storage chamber 3, so that a boss 4 is formed at the connection between the discharge port of the lower die 2 and the welding chamber 21.

[0023] Working principle: By adding a storage chamber 3 to the welding chamber 21 of the lower mold 2, the storage chamber 3 assists the welding chamber 21 to balance the metal flow rate and pressure. This reduces the required height of the welding chamber 21 while meeting the production requirements of the same profile, thus shortening the contact time between the metal and the mold core 5 and improving the service life of the mold.

[0024] It is worth noting that the height of the storage chamber 3 is set to be 1.2 to 1.5 times the reduction in the height of the welding chamber 21, so as to ensure that the sum of the height of the welding chamber 21 and the height of the storage chamber 3 is not less than the original height of the welding chamber, and the height of the storage chamber 3 is more than 2 mm greater than the reduction in the height of the welding chamber 21.

[0025] Taking the original welding chamber height of 20mm as an example, by reducing the welding chamber height by 5mm, a storage chamber 3 with a height of 7mm can be set up, so that the height of the storage chamber 3 plus the current welding chamber height of 15mm is greater than the original welding chamber height.

[0026] Preferably, the height of the welding chamber 21 is 6mm to 20mm.

[0027] In some implementations, please refer to Figure 4 As shown, the width of the boss 4 is A, which is 6mm to 12mm. Due to the presence of the storage chamber 3, the working belt of the lower die 2 will form the boss 4. By limiting the width of the boss 4, the strength of the working belt of the lower die 2 is ensured.

[0028] In some implementations, please refer to Figure 4 As shown, the end face of the boss 4 facing the storage chamber 3 is a slope. The angle of the slope is B, which is between 30° and 45°. Due to the presence of the storage chamber 3, the working belt of the lower die 2 will form the boss 4, and the metal will exert a lateral thrust on the working belt of the lower die 2. Therefore, the slope angle is limited for transition.

[0029] In some implementations, please refer to Figure 3 As shown, the upper mold 1 is provided with multiple flow dividers 11 that communicate with the welding chamber 21. The flow dividers 11 can be used to separate the metal flow into multiple metal streams with smaller cross-sections.

[0030] Preferably, the number of diversion holes 11 is 2 to 5.

[0031] In some implementations, please refer to Figure 3 As shown, the upper mold 1 is provided with a flow divider bridge 12 corresponding to the flow divider hole 11. The flow divider bridge 12 guides the metal flow to the flow divider hole 11.

[0032] In some implementations, please refer to Figure 3 As shown, the welding bridge angle of the diversion bridge 12 is 26° to 40°. By limiting the welding bridge angle of the diversion bridge 12, the plastic strain and stress concentration caused by metal friction and extrusion force on the mold core 5 are minimized.

[0033] It is worth noting that the welding bridge angle refers to the angle formed when the metal is diverted through the inlet of the diversion bridge 12 and then welded together through the diversion bridge 12, and refers to the included angle formed at the outlet end of the diversion bridge 12.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An extrusion die, characterized in that: It includes an upper mold and a lower mold that fit together; the lower mold is provided with a welding chamber, and the bottom of the welding chamber is provided with a material storage chamber, so that a boss is formed at the connection between the material outlet of the lower mold and the welding chamber.

2. The extrusion die according to claim 1, characterized in that: The width of the boss is 6mm to 12mm.

3. The extrusion die according to claim 1 or 2, characterized in that: The end face of the boss facing the storage chamber is a slope.

4. The extrusion die according to claim 3, characterized in that: The angle of the slope is between 30° and 45°.

5. The extrusion die according to claim 1, characterized in that: The upper mold is provided with multiple diversion holes that communicate with the welding chamber.

6. The extrusion die according to claim 5, characterized in that: The upper mold is provided with a flow divider bridge corresponding to the flow divider hole, and the welding angle of the flow divider bridge is 26° to 40°.

7. The extrusion die according to claim 5, characterized in that: The number of diversion holes is 2 to 5.

8. The extrusion die according to claim 1, characterized in that: The height of the welding chamber is 6mm to 20mm.

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