Ultrathin-wall aluminum extrusion die

Abstract

The utility model relates to an ultra-thin wall aluminum extrusion die which comprises an upper die, a middle die and a lower die, a flow guide hole is formed in the upper die, a die core and flow dividing holes arranged around the die core are arranged in the center of the bottom of the middle die, a welding chamber and a discharging hole are arranged in the lower die, and the ultra-thin wall aluminum extrusion die further comprises a pre-stress ring sleeved on the outer sides of the middle die and the lower die. The tail ends of the shunting holes and the welding chamber are covered in the width direction; the cooling channel is arranged in the prestressed ring and used for injecting cooling liquid to cool the prestressed ring; and the supporting block is arranged at the discharging hole of the lower die, and the inner diameter of the supporting block is larger than the hole diameter of the discharging hole. High-pressure impact in the extrusion process is counteracted through evenly-distributed prestress, elastic deformation of the die is effectively restrained, and the rate of finished products is increased; the supporting block is arranged at the discharging hole of the lower die, stable supporting is provided for discharging of the aluminum profile, and the aluminum profile can be prevented from being bent and deformed due to the weight or extrusion stress of the aluminum profile in the discharging process.

Description

Technical Field

[0001] This utility model relates to the field of aluminum profile forming mold technology, and in particular to an ultra-thin wall aluminum extrusion mold. Background Technology

[0002] Hollow ultra-thin wall profiles are hollow, square-shaped profiles widely used in homes as building decoration materials. The production process of hollow ultra-thin wall profiles requires hot extrusion dies. Traditional aluminum extrusion dies have several problems in the extrusion production of ultra-thin wall aluminum profiles. Firstly, the die structure has insufficient strength: the high temperature and pressure environment during extrusion easily causes elastic deformation of the die, especially in the areas of the flow channels and welding chambers, resulting in uneven profile wall thickness, surface ripples, and other defects, leading to a low yield. Secondly, the discharge stability is poor: after extrusion, ultra-thin wall profiles are prone to bending and twisting due to their own weight or residual stress. Existing discharge channels lack effective support structures, making it difficult to meet high-precision requirements for profile straightness.

[0003] In the prior art, for example, Chinese utility model patent with authorization announcement number CN219274098U discloses a thin-walled large-section aluminum extrusion die, which adjusts the angle and size of the flow distribution cavity and reduces the pressure on the lower die by increasing the cross-sectional area of ​​the flow distribution cavity near the lower die end, thus avoiding excessive pressure on the die and causing die damage. However, the above-mentioned problems still exist. Therefore, there is an urgent need for an extrusion die with both high rigidity and stable output characteristics to meet the high-precision and long-life production requirements of ultra-thin-walled aluminum profiles. Utility Model Content

[0004] The purpose of this invention is to provide an ultra-thin-walled aluminum extrusion die to solve the problems mentioned in the background art.

[0005] The above-mentioned objective of this utility model is achieved through the following technical solution: an ultra-thin wall aluminum extrusion die, comprising an upper die, a middle die, and a lower die, wherein the upper die is provided with a guide hole, the middle die has a die core at the bottom center and a flow distribution hole arranged around the die core, and the lower die is provided with a welding chamber and a discharge hole, and further comprising:

[0006] A prestressed ring is fitted on the outside of the middle and lower molds, and its width direction covers the end of the diversion hole and the welding chamber;

[0007] A cooling channel is provided inside the prestressed ring for injecting coolant to cool the prestressed ring.

[0008] A support block is provided at the discharge hole of the lower mold, and the inner diameter of the support block is larger than the diameter of the discharge hole.

[0009] Preferably, a limiting step is provided at the end where the middle mold and the lower mold meet, and the prestressed ring is located between the two limiting steps on the left and right.

[0010] Preferably, the prestressed ring is connected to the middle mold and the lower mold by an interference fit.

[0011] Preferably, the inner ring surface of the prestressed ring is provided with an annular groove, which is located at the interface between the middle mold and the lower mold.

[0012] Preferably, the cooling channels are spirally distributed within the prestressed ring, and the left and right ends of the prestressed ring are respectively provided with a coolant inlet and a coolant outlet.

[0013] Preferably, the pitch of the cooling channel gradually decreases from the flow divider hole to the welding chamber.

[0014] Preferably, the rear end of the lower mold is provided with an installation chamber, and the support block is disposed in the installation chamber.

[0015] Preferably, a sliding groove is provided on the inner wall of the loading chamber, and a slider is provided on the outer wall of the support block, the slider being engaged in the sliding groove.

[0016] Preferably, the two sides of the support block are fixed inside the discharge hole by positioning screws.

[0017] The beneficial effects of this utility model are:

[0018] The prestressed ring of this utility model covers the end of the diversion hole and the welding chamber area. The prestressed ring is evenly distributed to offset the high pressure impact during the extrusion process, effectively suppress the elastic deformation of the mold, ensure the uniformity of the profile wall thickness, reduce surface ripple defects, and improve the yield.

[0019] The support block is located at the lower die discharge hole, and its inner diameter is larger than the discharge hole diameter. It provides stable support for the aluminum profile discharge, which can prevent the aluminum profile from bending or deforming due to its own weight or extrusion stress during discharge. This ensures the dimensional accuracy and shape regularity of the aluminum profile, improves product quality, reduces the defect rate, and meets the high precision requirements of ultra-thin wall aluminum profiles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the extrusion die in an embodiment of this utility model;

[0021] Figure 2 This is a cross-sectional view of the extrusion die in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the installation of the prestressed ring in an embodiment of this utility model;

[0023] In the diagram: 1-Upper mold, 101-Guide hole, 2-Middle mold, 201-Mold core, 202-Diverter hole, 203-Limiting step, 3-Lower mold, 301-Welding chamber, 302-Discharge hole, 303-Installation chamber, 304-Slide groove, 4-Prestressed ring, 401-Cooling channel, 402-Coolant inlet, 403-Coolant outlet, 404-Annular groove, 5-Support block, 501-Slider, 6-Positioning screw. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present utility model.

[0026] Example:

[0027] like Figure 1 and Figure 2 As shown, the ultra-thin wall aluminum extrusion die includes an upper die 1, a middle die 2 and a lower die 3. The upper die 1 is provided with a guide hole 101. The bottom center of the middle die 2 is provided with a die core 201 and a diversion hole 202 arranged around the die core 201. The lower die 3 is provided with a welding chamber 301 and a discharge hole 302. The diversion hole 202 is connected to the guide hole 101 and the welding chamber 301 respectively. The welding chamber 301 is connected to the discharge hole 302.

[0028] The extrusion die also includes a prestressed ring 4 and a support block 5, such as Figure 3 As shown, the prestressed ring 4 is sleeved on the outside of the middle mold 2 and the lower mold 3, and its width direction covers the end of the diversion hole 202 and the welding chamber 301. The middle mold 2 and the lower mold 3 are both provided with a limiting step 203 at the joint end, and the prestressed ring 4 is located between the two limiting steps 203 on the left and right.

[0029] The prestressing ring 4 is connected to the middle mold 2 and the lower mold 3 by an interference fit, with an interference amount of 0.02-0.03mm. The prestressing ring 4 is made of double-layer alloy steel. During installation, the prestressing ring is heated to 300-350℃ to expand it before being inserted into the mold base. After cooling, a tight compressive stress layer is formed.

[0030] An annular groove 404 is provided on the inner ring surface of the prestressed ring 4. The annular groove 404 is located at the interface between the middle mold 2 and the lower mold 3, so that the prestressed ring 4 has a small amount of deformation in the axial direction.

[0031] A cooling channel 401 is provided inside the prestressed ring 4. The cooling channel 401 is located inside the inner alloy steel layer and is used to inject coolant to cool the prestressed ring 4. The cooling channel 401 is spirally distributed inside the prestressed ring 4, and a coolant inlet 402 and a coolant outlet 403 are respectively provided at the left and right ends of the prestressed ring 4.

[0032] The pitch of the cooling channel 401 gradually decreases from the direction of the diversion hole 202 to the welding chamber 301.

[0033] like Figure 1 and Figure 2 As shown, the support block 5 is located at the discharge hole 302 of the lower die 3. The rear end of the lower die 3 has a mounting chamber 303, and the support block 5 is positioned within the mounting chamber 303. The inner diameter of the support block 5 is larger than the diameter of the discharge hole 302. The inner contour of the support block maintains a micro-gap fit with the outer contour of the aluminum profile, with a gap ≤ 0.05mm, ensuring that the profile does not jam during extrusion while effectively constraining deformation. The support block 5 is made of silicon carbide ceramic, with a coefficient of thermal expansion of 4.5 × 10⁻⁶. -6 / ℃.

[0034] The inner wall of the mounting chamber 303 is provided with a sliding groove 304, and the outer wall of the support block 5 is provided with a slider 501, which is engaged in the sliding groove 304. The two sides of the support block 5 are fixed in the discharge hole 302 by positioning screws 6. When the support block 5 is partially worn, only the support block 5 needs to be replaced, reducing maintenance costs.

Claims

1. An ultra-thin-walled aluminum extrusion die, comprising an upper die (1), a middle die (2), and a lower die (3), wherein the upper die (1) is provided with a guide hole (101), the middle die (2) is provided with a die core (201) at the bottom center and a diversion hole (202) arranged around the die core (201), and the lower die (3) is provided with a welding chamber (301) and a discharge hole (302), characterized in that, Also includes: A prestressed ring (4) is fitted on the outside of the middle mold (2) and the lower mold (3), and covers the end of the diversion hole (202) and the welding chamber (301) in the width direction. A cooling channel (401) is provided inside the prestressed ring (4) for injecting coolant to cool the prestressed ring (4); A support block (5) is provided at the discharge hole (302) of the lower mold (3), and the inner diameter of the support block (5) is larger than the diameter of the discharge hole (302).

2. The ultra-thin-walled aluminum extrusion die according to claim 1, characterized in that: The middle mold (2) and the lower mold (3) are connected at one end, and a limiting step (203) is provided at both ends. The prestressed ring (4) is located between the two limiting steps (203).

3. The ultra-thin-walled aluminum extrusion die according to claim 2, characterized in that: The prestressed ring (4) is connected to the middle mold (2) and the lower mold (3) by an interference fit.

4. The ultra-thin-walled aluminum extrusion die according to claim 1, characterized in that: The inner ring surface of the prestressed ring (4) is provided with an annular groove (404), which is located at the interface between the middle mold (2) and the lower mold (3).

5. The ultra-thin-walled aluminum extrusion die according to claim 1, characterized in that: The cooling channel (401) is spirally distributed inside the prestressed ring (4), and the left and right ends of the prestressed ring (4) are respectively provided with a coolant inlet (402) and a coolant outlet (403).

6. The ultra-thin-walled aluminum extrusion die according to claim 5, characterized in that: The pitch of the cooling channel (401) gradually decreases from the direction of the diversion hole (202) to the welding chamber (301).

7. The ultra-thin-walled aluminum extrusion die according to claim 1, characterized in that: The lower mold (3) has an installation chamber (303) at its rear end, and the support block (5) is located in the installation chamber (303).

8. The ultra-thin-walled aluminum extrusion die according to claim 7, characterized in that: The inner wall of the installation chamber (303) is provided with a sliding groove (304), and the outer wall of the support block (5) is provided with a slider (501), which is engaged in the sliding groove (304).

9. The ultra-thin-walled aluminum extrusion die according to claim 8, characterized in that: The two sides of the support block (5) are fixed in the discharge hole (302) by positioning screws (6).

Images