Extrusion die with cathode and anode blocking tables

Abstract

The utility model discloses an extrusion die with a cathode and anode blocking table, which comprises an upper die and a lower die which are matched with each other, and the section shape of a section produced by the extrusion die has a groove structure; a concave female blocking table is arranged on the feeding side face of the lower die, a through die hole is formed in the female blocking table, and the shape of the die hole is matched with the outer contour of the section shape of a sectional material. A cantilever is formed at the position, corresponding to the groove structure, of the negative resistance table, and a protruding positive resistance table is arranged on the feeding side face of the cantilever. The upper die is provided with through flow dividing holes, and the flow dividing holes comprise first flow dividing holes right opposite to the positive resistance table. Compared with the conventional scheme, the extrusion die with the cathode and anode blocking tables has the advantages that the blocking table structure is additionally arranged, the shunting is more uniform, the formability, the strength and the stability of the die are improved, the elastic deformation is reduced, the cantilever collapse and fracture conditions are not easy to occur, the better forming effect of a profile structure can be ensured, and the production cost is reduced. And profiles with complex structures and high extrusion difficulty can also be normally produced.

Description

Technical Field

[0001] The utility model belongs to the technical field of profile extrusion dies, and in particular relates to an extrusion die with positive and negative blocking platforms. Background Art

[0002] There is a type of decorative material profile with a cross-sectional shape such as 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 two large groove structures arranged side by side in a transverse direction. Accordingly, due to the hollowing of the die hole in the lower die of the extrusion die, there will be two cantilever structures. In the extrusion molding process, the cantilever structure is subjected to a large pressure and is easily collapsed and deformed. In addition, it is difficult for the aluminum material to be filled into the die hole around the cantilever structure according to the designed flow rate. Therefore, there are problems such as instability, difficulty in molding, partial shortage of profiles, and unsatisfactory wall thickness, resulting in low yield rate, inability to produce normally, and easy scrapping of the extrusion die and short service life. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an extrusion die with positive and negative resistance platforms, solve the problems of instability and difficulty in forming of existing die solutions, achieve more uniform flow diversion through structural improvement, increase die formability, and avoid die collapse.

[0004] According to the technical scheme of the utility model, the utility model provides an extrusion die with positive and negative resistance platforms, including a matching upper die and a lower die, and the cross-sectional shape of the profile produced by the extrusion die has a groove structure; a recessed negative resistance platform is arranged on the feeding side of the lower die, and a through die hole is opened in the negative resistance platform, and the shape of the die hole matches the outer contour of the cross-sectional shape of the profile; the negative resistance platform is formed with a cantilever at a position corresponding to the groove structure, and a protruding positive resistance platform is arranged on the feeding side of the cantilever; the upper die is opened with a through diversion hole, and the diversion hole includes a first diversion hole directly opposite to the positive resistance platform.

[0005] Furthermore, the shape and size of the inlet side of the anode resistance platform is smaller than the shape and size of the outlet side of the first diversion hole.

[0006] Further, the shape of the anode resistance platform matches the shape of the groove structure and / or the first diversion hole.

[0007] Furthermore, the positive resistance platform is in the shape of a straight column, and the feeding side surface of the positive resistance platform is a plane.

[0008] Furthermore, a concave welding chamber is provided on the feeding side of the lower die, and the cathode resistance platform is located in the welding chamber.

[0009] Furthermore, the first diverter hole is located in the middle of the upper mold, and the diverter hole also includes a plurality of second diverter holes, and the second diverter holes are arranged around the outer side of the first diverter hole.

[0010] Furthermore, the diverter holes are all in a shape that gradually expands from the feeding side to the discharging side, and / or the feeding side surface of the upper mold is recessed at the outer side at the middle position.

[0011] Furthermore, the cross-sectional shape of the profile is generally a rectangular shape with a width greater than a height, and the groove structure includes at least two grooves arranged side by side along the width direction.

[0012] Furthermore, in the cross-sectional shape of the profile, there is a constricted section extending inwardly at the opening of the groove structure.

[0013] Furthermore, in the cross-sectional shape of the profile, there is a cavity structure around the groove structure; the upper mold is protrudingly provided with a mold core corresponding to the cavity structure on the discharge side.

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

[0015] Compared with the conventional scheme, the extrusion die with positive and negative baffles of the utility model has an additional baffle structure, which makes the flow distribution more uniform, improves the mold formability, strength and stability of the die, reduces elastic deformation, is less likely to cause cantilever collapse and breakage, and can better ensure that the profile structure forming effect is better, and profiles with complex structures and high extrusion difficulty can also be produced normally. 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 1 Schematic 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 mold; 11. First diverter hole; 12. Second diverter hole; 13. Mold core; 2. Lower mold; 21. Mold hole; 22. Cantilever; 23. Male resistance platform; 24. Female resistance platform; 25. Welding chamber; 3. Profile; 31. Groove structure; 32. Narrowing section; 33. Cavity structure; 4. Mold pad. DETAILED DESCRIPTION

[0023] The utility model provides an extrusion die with positive and negative blocking platforms, which solves the problems of instability and difficulty in forming of existing die solutions, achieves more uniform flow diversion through structural improvement, increases die formability, and avoids die collapse.

[0024] See also Figures 1 to 4 An extrusion die with a positive and negative resistance platform according to an embodiment of the utility model comprises an upper die 1 and a lower die 2 which are installed in a matching manner. The cross-sectional shape of the profile 3 produced by the extrusion die has a groove structure 31. The lower die 2 is provided with a through die hole 21, and the shape of the die hole 21 matches (is consistent with) the outer contour of the cross-sectional shape of the profile 3. The lower die 2 is formed with a cantilever 22 at a position corresponding to the groove structure 31. The "cantilever" refers to a cantilever formed on the lower die base due to the hollowing of the die hole and only on one side ( Figure 1 The cantilever is located in the lower die and will be subjected to the extrusion force of the aluminum material, so it is easy to deform, deform (collapse), or even break.

[0025] One of the main improvements of this solution is that a concave negative resistance platform 24 (or called a groove) is provided on the feeding side of the lower mold 2, and the mold hole 21 and the cantilever 22 are both located in the negative resistance platform 24. In other words, a through mold hole 21 is provided in the negative resistance platform 24, and the negative resistance platform 24 is formed with a cantilever 22 at a position corresponding to the groove structure 31. A protruding positive resistance platform 23 (or called a half core head) is provided on the feeding side of the cantilever 22, and a through diverter hole is provided on the upper mold 1, and the diverter hole includes a first diverter hole 11 directly opposite to the positive resistance platform 23. The positive resistance platform 23 is protruding toward the feeding side, so it is called positive; the feeding side of the negative resistance platform 24 is lower than the feeding side of the positive resistance platform 23, and also lower than the feeding side of the rest of the lower mold 2, and is a concave structure, so it is called negative. The main function of the positive resistance platform 23 includes flow diversion, and the main function of the negative resistance platform 24 includes flow blocking; the positive resistance platform 23 and the negative resistance platform 24 together form a "yin-yang resistance platform" structure to achieve continuous control in the flow direction of the aluminum material, thereby effectively adjusting the flow rate and flow velocity distribution at each position and reducing the deformation of the cantilever 22.

[0026] The main principle of the utility model is as follows. For the existing scheme without a blocking platform, the mold collapse problem will be more serious, resulting in partial shortage of profiles and failure to obtain the desired cross-sectional shape. The positive and negative blocking platforms set in this scheme can play a diversion role, pushing the aluminum material to the surroundings to ensure the amount of aluminum material in the mold holes around it, and then blocking the flow through the surrounding negative blocking platform 24 to adjust the flow rate and strengthen welding. At the same time, it also reduces the pressure on the cantilever and avoids deformation of the mold, so that better molding can be achieved.

[0027] More specifically, the shape and size of the inlet side of the positive resistance platform 23 is smaller than the shape and size of the outlet side of the first diversion hole 11; in other words, Figure 1 From the perspective shown, the anode platform 23 is included in the projection range of the first diverter hole 11, so that the aluminum material can flow easily from between the anode platform 23 and the first diverter hole 11 to the surroundings. Optionally, the shape of the anode platform 23 matches the shape of the groove structure 31 and / or the first diverter hole 11, for example Figure 1 In the illustrated embodiment, the shapes of the anode block 23, the groove structure 31, and the first diversion hole 11 are all substantially rectangular. Optionally, the anode block 23 is in the shape of a straight column, and the feeding side of the anode block 23 is a plane, for example Figure 1 In the embodiment shown, the positive resistance platform 23 is generally a rectangular parallelepiped. It is understandable that in other embodiments, according to specific circumstances, it is also possible to consider setting the positive resistance platform 23 to other shapes, or the local shape size is larger than the first diversion hole 11, and the height of the positive resistance platform 23 and the size of the negative resistance platform 24 can be designed as needed, so as to adjust the flow and distribution of the aluminum material.

[0028] See also Figure 4 , Figure 5 The lower die 2 is provided with a concave welding chamber 25 on the feeding side, and the negative resistance platform 24 is located in the welding chamber 25. The shape of the welding chamber 25 matches the outer contour of the outfeed side of the outermost diverter hole, and the negative resistance platform 24 matches the outer contour of the die hole 21 and includes a cantilever 22. In this solution, there are two welding processes generated by the welding chamber 25 and the negative resistance platform 24 during the profile forming process, which further ensures the welding effect, helps to avoid defects and improve the profile quality.

[0029] See also Figure 3 The first diverter hole 11 is located in the middle of the upper mold 1, and the diverter hole also includes a plurality of second diverter holes 12. The second diverter holes 12 are arranged around the outer side of the first diverter hole 11, and a diverter bridge is formed between the diverter holes, so that the aluminum material is diverted and then welded on the feeding side of the lower mold 2. In the preferred embodiment, the diverter holes are all in a shape that gradually expands from the feeding side to the discharging side, such as Figure 3In the figure, the solid line contour of the diverter hole is the inlet side contour, and the dotted line is the hole inner wall and the outlet side contour. And preferably, the inlet side of the upper mold 1 is recessed at the outer side in the middle position, in other words, the first diverter hole 11 and the diverter bridge around it are a sunken structure, which helps to relieve pressure.

[0030] For further information, see Figure 2 The cross-sectional shape of the profile 3 is generally a rectangular shape with a width greater than a height, and the groove structure 31 includes at least two groove structures 31 arranged side by side in the width direction. The cross-sectional shape of the profile 3 is basically symmetrical, and the two cantilevers 22 of the lower mold 2 corresponding to the two groove structures 31 are both located in the middle part, which is more prone to deformation and leads to unsatisfactory wall thickness of the profile. In addition, in the cross-sectional shape of the profile 3, there is a constriction section 32 extending inward at the opening of the groove structure 31, and the connecting part of the cantilever 22 is narrower, which is more prone to collapse. This scheme is particularly suitable for the above situation and can significantly improve the forming effect of this profile. In addition, in the cross-sectional shape of the profile 3, there is a cavity structure 33 around the groove structure 31, and the upper mold 1 is protrudingly provided with a mold core 13 corresponding to the cavity structure 33 on the discharge side. This profile structure is more complex and has relatively higher requirements for diversion design. The use of this scheme can also more flexibly adjust the flow and distribution through the design of the baffle to ensure that the wall thickness is relatively ideal.

[0031] See also Figure 5 In a preferred embodiment, the die hole 21 has a first-level empty knife, a second-level empty knife and a third-level empty knife which are arranged in sequence and gradually expand on the discharge side to ensure the surface quality of the profile when it is discharged. And preferably, a die pad 4 is also provided on the discharge side of the lower die 2 to further provide support and prevent the lower die 2 from deforming.

[0032] To sum up, compared with the conventional scheme, the extrusion die with positive and negative baffles of the utility model has an additional baffle structure, which makes the flow diversion more uniform, increases the mold formability, strength and stability, reduces elastic deformation, is less likely to cause cantilever collapse and breakage, and can better ensure that the profile structure forming effect is better, and profiles with complex structures and high extrusion difficulty can also be produced normally.

Claims

1. An extrusion die with positive and negative resistance platforms, 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 has a groove structure (31); a recessed negative resistance platform (24) is provided on the feeding side of the lower die (2), a through die hole (21) is provided in the negative resistance platform (24), and the shape of the die hole (21) matches the outer contour of the cross-sectional shape of the profile (3); the negative resistance platform (24) is formed with a cantilever (22) at a position corresponding to the groove structure (31), and a protruding positive resistance platform (23) is provided on the feeding side of the cantilever (22); the upper die (1) is provided with a through diversion hole, and the diversion hole includes a first diversion hole (11) directly opposite to the positive resistance platform (23).

2. The extrusion die with positive and negative blocking platforms according to claim 1, characterized in that: The shape and size of the inlet side of the anode resistance platform (23) are smaller than the shape and size of the outlet side of the first diversion hole (11).

3. The extrusion die with positive and negative resistance platforms according to claim 1, characterized in that: The shape of the positive resistance platform (23) matches the shape of the groove structure (31) and / or the shape of the first diversion hole (11).

4. The extrusion die with positive and negative blocking platforms according to claim 1, characterized in that: The anode resistance platform (23) is in the shape of a straight column, and the feeding side surface of the anode resistance platform (23) is a plane.

5. The extrusion die with positive and negative blocking platforms according to claim 1, characterized in that: The lower die (2) is provided with a recessed welding chamber (25) on the feeding side, and the negative resistance platform (24) is located in the welding chamber (25).

6. The extrusion die with positive and negative blocking platforms according to any one of claims 1 to 5, characterized in that: The first diverter hole (11) is located in the middle of the upper mold (1), and the diverter hole also includes a plurality of second diverter holes (12). The second diverter holes (12) are arranged around the outer side of the first diverter hole (11).

7. The extrusion die with positive and negative blocking platforms according to claim 6, characterized in that: The diversion holes are all in a shape that gradually expands from the feeding side to the discharging side, and / or the feeding side surface of the upper mold (1) is recessed at the middle position to the outer position.

8. The extrusion die with positive and negative blocking platforms according to any one of claims 1 to 5, characterized in that: The cross-sectional shape of the profile (3) is generally a rectangular shape with a width greater than a height, and the groove structure (31) comprises at least two groove structures arranged side by side in the width direction.

9. The extrusion die with positive and negative blocking platforms according to any one of claims 1 to 5, characterized in that: In the cross-sectional shape of the profile (3), a contraction section (32) extending inwards is provided at the opening of the groove structure (31).

10. The extrusion die with positive and negative blocking platforms according to any one of claims 1 to 5, characterized in that: In the cross-sectional shape of the profile (3), a cavity structure (33) is provided around the groove structure (31); and the upper mold (1) is provided with a mold core (13) protruding on the discharge side corresponding to the cavity structure (33).

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