Extrusion die capable of preventing profile from twisting

Abstract

The utility model discloses an extrusion die for preventing a profile from twisting, which comprises an upper die and a lower die which are matched with each other, and the section shape of the profile produced by the extrusion die comprises a cross beam part and a wide head part positioned at one end of the cross beam part; the lower die is provided with a through die hole, and the shape of the die hole is matched with the outer contour of the section shape of a profile. The upper die is provided with a through flow dividing hole, the discharging side of the upper die is provided with a protruding half core head, the half core head is right opposite to the die hole, the half core head is in a strip shape and corresponds to the cross beam part, and a gap is formed between the half core head and the die hole in the direction from feeding to discharging. According to the scheme, the flow speed is adjusted and stabilized by arranging the half core head structure, and the phenomenon that the flow speed on one side is high is avoided, so that a formed profile is not twisted, the mold formability is improved, and stable production can be achieved; meanwhile, due to the fact that a half core head and a two-stage welding mode are adopted, a die hole can adopt a relatively short working tape, the phenomenon that the working tape is haired is reduced, and the surface quality of the profile is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of profile extrusion dies, and in particular relates to an extrusion die for preventing profile twisting. Background Art

[0002] The cross-sectional shape of a type of existing connector profile is as follows: Figure 2 As shown, the extrusion die used for extrusion molding generally adopts a split-flow combination die. The basic principle of extrusion molding is to apply a certain pressure to the raw aluminum rod so that it flows out from the die hole of the extrusion die and the gap between the die hole and the die core, thereby obtaining a profile with the desired cross-sectional shape and size. For example, Figure 2 The profile shown has a long horizontal length and a large size and thickness at the left end. This type of profile is prone to inconsistent flow rates during extrusion, that is, the flow rate is fast in the narrower part on the right, while the flow rate is slow in the thicker part on the left. As a result, the extruded profile will be twisted and bent in the length direction, and the required straight profile cannot be obtained. In addition, when designing the extrusion die for this type of thick-walled profile, a longer working belt is usually required, and the surface of the formed profile is prone to burrs, rough edges, and roughness. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an extrusion die for preventing profile twisting, solve the problem that the profile extruded by the existing die scheme is prone to twisting, achieve a stable flow rate, increase formability, and help avoid burrs on the profile surface.

[0004] According to the technical scheme of the utility model, the utility model provides an extrusion die for preventing the twisting of a profile, comprising a matching upper die and a lower die, the cross-sectional shape of the profile produced by the extrusion die comprising a cross-beam portion and a wide head portion located at one end of the cross-beam portion; the lower die is provided with a through die hole, the shape of the die hole matches the outer contour of the cross-sectional shape of the profile; the upper die is provided with a through diversion hole, the upper die is provided with a protruding half-core head on the discharge side, the half-core head is opposite to the die hole, the half-core head is strip-shaped and corresponds to the cross-beam portion, and there is a gap between the half-core head and the die hole in the direction from feeding to discharging.

[0005] Furthermore, the width of the strip of the half core head is greater than the width at the position corresponding to the die hole and the cross beam portion.

[0006] Furthermore, the lower die is provided with a recessed primary welding chamber on the feeding side, a recessed secondary welding chamber is provided in the primary welding chamber, and the die hole is located in the secondary welding chamber.

[0007] Furthermore, the width of the strip of the half core head is greater than the width of the secondary welding chamber at a position corresponding to the crossbeam portion.

[0008] Further, the distance between the contour of the secondary welding chamber and the die hole at a position corresponding to the wide head and at a position corresponding to the other end of the beam portion is greater than that at other positions.

[0009] Furthermore, the distance between the discharge side of the half core head and the bottom surface of the primary welding chamber is 15 mm ± 3 mm.

[0010] Furthermore, the diverter holes are distributed around the center of the upper mold, and there are diverter bridges between the diverter holes. The diverter bridges include a wide head side diverter bridge, a middle diverter bridge and a crossbeam side diverter bridge. The half core head is located on the discharge side of the middle diverter bridge; the wide head side diverter bridge and the crossbeam side diverter bridge are radially arranged around the middle diverter bridge.

[0011] Furthermore, the intersection position of the wide head side shunt bridge and the middle shunt bridge corresponds to the wide head portion; the inlet side of the wide head side shunt bridge and the middle shunt bridge is concave from the outside to the intersection position.

[0012] Furthermore, in the cross-sectional shape of the profile, a cavity portion is provided on a side of the wide head portion away from the cross beam portion; the upper die is provided with a protruding die core on the discharge side, and the die core corresponds to the cavity portion.

[0013] Furthermore, the mold core is threadedly connected to the upper mold.

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

[0015] In summary, the extrusion die for preventing profile twisting of the utility model is particularly suitable for connector profiles with strip-shaped cross-sections. By setting a half-core head structure to adjust and stabilize the flow rate, the phenomenon of fast flow rate on one side is avoided, so that the formed profile does not twist, the mold formability is increased, stable production is possible, and the yield rate is high; at the same time, due to the use of a half-core head and a two-stage welding method, the die hole can use a relatively short working belt, reducing the phenomenon of working belt dragging and improving the surface quality of the profile; and the independent mold core structure with threaded connection enhances the stability and service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall perspective structure of an extrusion die according to an embodiment of the utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional shape of the profile produced by the extrusion die shown.

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure of the upper die in the extrusion die shown.

[0019] Figure 4 yes Figure 1Schematic diagram of the structure of the lower die in the extrusion die shown.

[0020] Figure 5 It is a schematic diagram of the overall cross-sectional structure of an extrusion die according to an embodiment of the utility model.

[0021] Description of reference numerals in the accompanying drawings:

[0022] 1. Upper die; 11. Diverter hole; 12. Half core head; 13. Diverter bridge on wide head side; 14. Diverter bridge in the middle; 15. Diverter bridge on beam side; 16. Mold core; 2. Lower die; 21. Die hole; 22. Primary welding chamber; 23. Secondary welding chamber; 3. Profile; 31. Beam part; 32. Wide head; 33. Cavity part. DETAILED DESCRIPTION

[0023] The utility model provides an extrusion die for preventing profile twisting, which solves the problem that profiles extruded by existing die solutions are prone to twisting, achieves a stable flow rate, increases formability, and helps avoid burrs on the profile surface.

[0024] First see Figure 2 The cross-sectional shape of the profile 3 produced by the extrusion die of one embodiment of the utility model is generally strip-shaped, including a cross beam 31 and a wide head 32 located at one end of the cross beam 31. The width of the wide head 32 is greater than that of the cross beam 31 of the strip. Therefore, in the transverse direction (the length direction of the strip), the amount of aluminum required for extrusion molding is uneven, and the amount required at one end of the wide head 32 is relatively large, while the amount required at the other end is relatively small. Therefore, it is easy for the aluminum material flow rate on one side of the cross beam 31 to be faster than that of the wide head 32, which in turn causes the expected straight long strip profile to bend, that is, torsion and twisting problems, and the process is unstable and cannot be produced normally. The utility model is intended to improve the design of the extrusion die for such easily twisted profiles.

[0025] See also Figures 1 to 4 An extrusion die for preventing profile twisting according to an embodiment of the utility model comprises a matching upper die 1 and a lower die 2. The lower die 2 is provided with a die hole 21 extending from the feeding side to the discharging side. The shape of the die hole 21 matches (is consistent with) the outer contour of the cross-sectional shape of the profile 3. The upper die 1 is provided with a plurality of diversion holes 11 extending from the feeding side to the discharging side. The upper die 1 is provided with a protruding half core head 12 on the discharging side. The half core head 12 faces the die hole 21 and is located on the feeding side of the die hole 21. The half core head 12 is in a strip-shaped block shape and corresponds to the cross beam portion 31. More specifically, the half core head 12 corresponds to the middle section of the die hole 21. One end of the half core head 12 corresponds to the boundary between the cross beam portion 31 and the wide head portion 32. The other end of the half core head 12 is shorter than the end of the die hole 21. There is a gap between the half core head 12 and the die hole 21 in the feeding to discharging direction.

[0026] This solution achieves flow rate control by setting up a half core head 12, avoiding excessive flow rate at the position of the beam part 31, thereby avoiding the torsion problem. In addition, if the existing mold design does not use a half core head, the working belt needs to be very long (the inner side of the mold hole 21 with the same profile as the profile is very long in the direction from feeding to discharging), and then the surface burr problem is caused due to friction, also known as "working belt drag". This solution uses a core head 12 to slow down the flow rate, which can reduce the length of the working belt, thereby significantly reducing the burr situation and improving the surface quality of the profile.

[0027] See also Figure 1 Preferably, the width of the strip of the half core head 12 is greater than the width at the corresponding position of the die hole 21 and the cross beam portion 31, and the flowing aluminum material needs to pass over the edge of the half core head 12 to enter the die hole 21, thereby more effectively reducing the flow rate.

[0028] Please also see Figure 4 The lower die 2 is provided with a recessed primary welding chamber 22 on the feeding side, a recessed secondary welding chamber 23 is provided in the primary welding chamber 22, and the die hole 21 is located in the secondary welding chamber 23. The shape of the primary welding chamber 22 matches the outer contour of the discharge side of the outermost diverter hole, and the secondary welding chamber 23 matches the outer contour of the die hole 21. Generally, there is no secondary welding for this type of profile. In this solution, secondary welding is used to further ensure the welding effect, which helps to avoid defects and improve the quality of the profile. Further, as Figure 1 As shown, the width of the strip of the half core head 12 is greater than the width of the secondary welding chamber 23 at the position corresponding to the cross beam portion 31, which helps to further control and reduce the flow rate.

[0029] More preferably, if Figure 4 As shown, the distance between the contour of the secondary welding chamber 23 and the die hole 21 is greater at the position corresponding to the wide head 32 and at the position corresponding to the other end of the beam portion 31 than at other positions, thereby helping to increase the feed flow at the wide head 32 position and at a position farther from the center of the mold, and further adjusting the overall flow balance.

[0030] See also Figure 5 The distance between the discharge side of the half core head 12 and the bottom surface of the primary welding chamber 22 is, for example, about 15 mm (for example, ±3 mm). More specifically, for example, the height of the half core head 12 is 10 mm, and the depth of the primary welding chamber 22 is 25 mm, thereby reducing the welding height.

[0031] See also Figure 3, the diverter holes 11 are distributed around the center of the upper mold 1. For example, there are four diverter holes 11 on the top, bottom, left and right. The number and shape of the diverter holes 11 can be adjusted according to specific circumstances. There are diverter bridges between the diverter holes 11. The diverter bridges include a wide head side diverter bridge 13, a middle diverter bridge 14 and a crossbeam side diverter bridge 15. The half core head 12 is located on the discharge side of the middle diverter bridge 14. When the crossbeam portion 31 is longer, the right side of the half core head 12 is exposed to the diverter hole on the right. The wide head side diverter bridge 13 and the crossbeam side diverter bridge 15 are radially arranged around the middle diverter bridge 14. The intersection position of the wide head side diverter bridge 13 and the middle diverter bridge 14 corresponds to the wide head 32. Preferably, the inlet side of the wide head side diverter bridge 13 and the middle diverter bridge 14 is concave from the outside to the intersection position, such as Figure 5 As shown, the pressure is released on the feeding side, so that the feeding amount at the corresponding position of the wide head 32 is increased.

[0032] Furthermore, if Figure 2 As shown, in the cross-sectional shape of the profile 3, there is a circular cavity 33 on the side of the wide head 32 away from the cross beam 31. Correspondingly, the upper die 1 is provided with a protruding core 16 on the discharge side, and the core 16 corresponds to the cavity 33. Preferably, the core 16 is formed separately, and the core 16 is threadedly connected to the upper die 1. This kind of profile has a thicker wall and a smaller model, so the core is easily deformed by pressure; the core 16 with an independent threaded connection can be directly replaced when the core 16 is deformed or broken by pressure.

[0033] In summary, the extrusion die for preventing profile twisting of the utility model is particularly suitable for connector profiles with strip-shaped cross-sections. By setting a half-core head structure to adjust and stabilize the flow rate, the phenomenon of fast flow rate on one side is avoided, so that the formed profile does not twist, the mold formability is increased, stable production is possible, and the yield rate is high; at the same time, due to the use of a half-core head and a two-stage welding method, the die hole can use a relatively short working belt, reducing the phenomenon of working belt dragging and improving the surface quality of the profile; and the independent mold core structure with threaded connection enhances the stability and service life of the mold.

Claims

1. An extrusion die for preventing a profile from twisting, comprising a matching upper die (1) and a lower die (2), characterized in that: The cross-sectional shape of the profile (3) produced by the extrusion die includes a crossbeam portion (31) and a wide head portion (32) located at one end of the crossbeam portion (31); The lower die (2) is provided with a through die hole (21), and the shape of the die hole (21) matches the outer contour of the cross-sectional shape of the profile (3); The upper mold (1) is provided with a through diversion hole (11), and the upper mold (1) is provided with a protruding half core head (12) on the discharge side, the half core head (12) is directly opposite to the mold hole (21), the half core head (12) is strip-shaped and corresponds to the cross beam portion (31), and there is a gap between the half core head (12) and the mold hole (21) in the direction from feeding to discharging.

2. The extrusion die for preventing profile twisting according to claim 1, characterized in that: The strip width of the half core head (12) is greater than the width of the die hole (21) at a position corresponding to the crossbeam portion (31).

3. The extrusion die for preventing profile twisting according to claim 1, characterized in that: The lower die (2) is provided with a recessed primary welding chamber (22) on the feeding side, a recessed secondary welding chamber (23) is provided in the primary welding chamber (22), and the die hole (21) is located in the secondary welding chamber (23).

4. The extrusion die for preventing profile twisting according to claim 3, characterized in that: The strip width of the half core head (12) is greater than the width of the secondary welding chamber (23) at a position corresponding to the crossbeam portion (31).

5. The extrusion die for preventing profile twisting according to claim 3, characterized in that: The distance between the contour of the secondary welding chamber (23) and the die hole (21) is greater at a position corresponding to the wide head (32) and at a position corresponding to the other end of the crossbeam (31) than at other positions.

6. The extrusion die for preventing profile twisting according to claim 3, characterized in that: The distance between the discharge side of the semi-core head (12) and the bottom surface of the primary welding chamber (22) is 15 mm ± 3 mm.

7. The extrusion die for preventing profile twisting according to any one of claims 1 to 6, characterized in that: The diverter holes (11) are distributed around the center of the upper mold (1), and diverter bridges are arranged between the diverter holes (11). The diverter bridges include a wide head side diverter bridge (13), a middle diverter bridge (14) and a crossbeam side diverter bridge (15). The half core head (12) is located on the discharge side of the middle diverter bridge (14); the wide head side diverter bridge (13) and the crossbeam side diverter bridge (15) are radially arranged around the middle diverter bridge (14).

8. The extrusion die for preventing profile twisting according to claim 7, characterized in that: The intersection position of the wide head side shunt bridge (13) and the middle shunt bridge (14) corresponds to the wide head portion (32); the inlet side of the wide head side shunt bridge (13) and the middle shunt bridge (14) are in a concave shape from the outside to the intersection position.

9. The extrusion die for preventing profile twisting according to any one of claims 1 to 6, characterized in that: In the cross-sectional shape of the profile (3), a cavity portion (33) is provided on the side of the wide head portion (32) away from the cross beam portion (31); the upper mold (1) is provided with a protruding mold core (16) on the discharge side, and the mold core (16) corresponds to the cavity portion (33).

10. The extrusion die for preventing profile twisting according to claim 9, characterized in that: The mold core (16) is threadedly connected to the upper mold (1).

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