Extrusion die with top pin

Abstract

The present application relates to a kind of extrusion die with top column, including the upper die and lower die of cooperation installation, the section of profile produced by extrusion die is U-shaped structure;Lower die is recessed in the side surface towards upper die and is provided with welding chamber, through hole is provided in welding chamber, the shape of through hole is same with the outer contour of profile, and through hole has U-shaped forming part corresponding to the U-shaped structure of profile;Upper die is provided with through split hole, and upper die is protrudingly provided with top column in the side surface towards lower die, and top column is located in the region surrounded by U-shaped forming part;In the process of extrusion forming, the end of top column is tightly abutted on welding chamber.This scheme is not easy to collapse, and the service life of the die is improved;And more stable, not easy to deform, guarantee profile forming effect;At the same time, top column also has the function of adjusting feed, guarantee the required area is sufficient, and good formability, and the die design is more convenient.

Description

Technical Field

[0001] This invention belongs to the field of profile extrusion die technology, and specifically relates to an extrusion die with a top column. Background Technology

[0002] The basic principle of aluminum profile extrusion molding process is to apply a certain pressure to the raw aluminum rod, causing it to flow out from the die hole or the gap between the die hole and the die core, thereby obtaining a profile with the required cross-sectional shape and size.

[0003] For example Figure 3 The profile shown has an overall U-shape with a large opening. The extrusion die designed using existing mold design methods is similar to the structure shown in Chinese Utility Model Patent No. CN209647252U. Because the die hole of the lower die is located in the center of the die, and the corresponding position of the U-shaped opening and the interior of the U-shape is located in the center of the die, it will be subjected to great pressure during the extrusion process. Since the upper die is usually the end face or flow divider at this position, it is prone to deformation or even collapse. The extrusion die has poor stability, is easy to scrap, and has a short service life.

[0004] also, Figure 3 The profile shown has a small U-shaped groove structure in the upper right corner. It is necessary to ensure a stable and sufficient supply of material to this local area so that there is a relatively large flow of aluminum material to complete the forming. Using the existing mold structure will result in poor formability and low profile yield in this part. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an extrusion die for this type of profile with a large overall U shape, so as to avoid the situation that the die is easily crushed and scrapped, and improve the stability of the die.

[0006] According to the technical solution of the present invention, the present invention provides an extrusion die with a top post, including an upper die and a lower die that are fitted together. The profile produced by the extrusion die has a U-shaped cross-section. The lower die has a recessed welding chamber on one side facing the upper die, and a through die hole is formed in the welding chamber. The shape of the die hole is the same as the outer contour of the profile, and the die hole has a U-shaped forming part corresponding to the U-shaped structure of the profile. The upper die has a through diversion hole, and a top post is provided on one side of the upper die facing the lower die. The top post is located in the area enclosed by the U-shaped forming part. During the extrusion molding process, the end of the top post abuts against the welding chamber.

[0007] Furthermore, the profile has a partial shaping structure in the middle of the U-shaped structure; the mold hole has a partial shaping part corresponding to the partial shaping structure; the top column is located close to the partial shaping part.

[0008] Further, at least one of the two ends of the U-shaped structure of the profile further has a cavity structure; the die hole has a cavity forming part corresponding to the cavity structure; the upper die further protrudes a die core on the side facing the lower die, and the die core corresponds to the cavity forming part.

[0009] Further, the outer side of the end of the die core is provided with a protruding working belt, and the outer contour of the working belt is the same as the inner contour of the cavity structure, and the working belt is located in the cavity forming part.

[0010] Further, the shunt hole comprises a cavity shunt hole, and the cavity shunt hole is arranged around the die core.

[0011] Further, the shunt hole comprises a local modeling shunt hole, and the local modeling shunt hole is opposite to the local modeling forming part.

[0012] Further, the top column is cylindrical.

[0013] Further, the local modeling structure is a U groove, and the opening direction of the U groove is the same as the opening direction of the U-shaped structure of the profile.

[0014] Further, the lower die is provided with a first, second, third and fourth empty knife groove on the side facing away from the upper die.

[0015] Further, a die cushion is further included, and the die cushion is arranged on the side of the lower die facing away from the upper die.

[0016] Compared with the prior art, the beneficial technical effects of the present application are as follows:

[0017] 1. The upper die of the present application is in contact with the lower die through the top column, so that the die is not easy to collapse, and the service life of the die is improved; at the same time, the static friction generated by the top column makes the shape of the upper die and the lower die more stable, and is not easy to deform, for example, left and right deviation, caused by the pressure of aluminum material, so that the stability is strong, and the profile forming effect is guaranteed.

[0018] 2. The top column of the present application also has the function of adjusting the supply of material. For the profile with local modeling structure such as small U groove, the aluminum material can be blocked and separated by the top column, so that most of the entering aluminum material enters the area of the local modeling structure, and the supply of material is sufficient and the forming property is good. Moreover, during the design of the die, the diameter and position of the top column can be adjusted according to the needs, so that the design and adjustment process is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure schematic diagram of the extrusion die of an embodiment of the present application.

[0020] Figure 2 is Figure 1 a cross-sectional view of the structure shown.

[0021] Figure 3 is Figure 1 a sectional view of the profile produced by the extrusion die shown.

[0022] Figure 4 is Figure 2 a schematic view of the structure at the lower die hole and the air knife groove in the embodiment shown. The reference signs in the drawing are explained as follows:

[0023] 1. upper die;

[0024] 2. lower die;

[0025] 3. welding chamber;

[0026] 4. die hole;

[0027] 5. U-shaped forming part;

[0028] 6. flow dividing hole;

[0029] 7. ejector pin;

[0030] 8. partial modeling forming part;

[0031] 9. cavity forming part;

[0032] 10. die core;

[0033] 11. working band;

[0034] 12. cavity flow dividing hole;

[0035] 13. partial modeling flow dividing hole;

[0036] 14. first air knife groove;

[0037] 15. second air knife groove;

[0038] 16. third air knife groove;

[0039] 17. fourth air knife groove;

[0040] 18. die cushion;

[0041] A. profile;

[0042] A1. U-shaped structure;

[0043] A2. partial modeling structure;

[0044] A3. cavity structure. DETAILED DESCRIPTION

[0045] The present application provides an extrusion die, which avoids the situation of easy collapse and scrapping, and improves the stability of the die. First, please refer to Figure 3A typical profile A targeted by the present application is a decorative pipe, which has a U-shaped structure A1 as a whole in cross section, and has a cavity structure A3 at both ends of the U-shaped structure A1, and has a local modeling structure A2 at a middle position of the U-shaped structure A1. The local modeling structure A2 is, for example, a small U-shaped groove structure protruding on a plane (or a smooth curved surface), and the opening direction of the U-shaped groove is the same as that of the U-shaped structure A1 of the profile A, i.e. protruding outward, and is farther away from the middle part and more difficult to feed; or the opening direction is opposite, i.e. the U-shaped groove protrudes inward; or is an additional cavity, a fitting inlay groove, etc.; in general, from the cross-sectional view, the path of the local modeling structure A2 is more complex than the rest of the middle part of the U-shaped structure A1, and more aluminum material is needed to form.

[0046] Please refer to Figure 1 、 Figure 2 An extrusion die with a top pillar according to an embodiment of the present application comprises an upper die 1 and a lower die 2 installed in cooperation. The lower die 2 is provided with a recessed welding chamber 3 at a middle position of a side face facing the upper die 1, and a through die hole 4 is provided in the welding chamber 3, the shape of the die hole 4 is the same as the outer contour of the profile A, and the die hole 4 has a U-shaped forming part 5 corresponding to the U-shaped structure A1 of the profile A. The upper die 1 is provided with a plurality of through flow holes 6, and the upper die 1 is provided with a top pillar 7 protruding from a side face facing the lower die 2, the top pillar 7 is located in an area surrounded by the U-shaped forming part 5; during the extrusion forming process, the end of the top pillar 7 abuts against the welding chamber 3. The top pillar 7 is preferably, for example, cylindrical, and other shapes can be selected as needed. Anti-slip structures such as anti-slip patterns can be optionally provided on the end face of the top pillar 7.

[0047] In the above structure, during extrusion forming, the upper die 1 is in contact and tightly pressed with the lower die 2 through the top pillar 7, so that the extrusion die is not easy to be collapsed, and the service life is greatly improved compared with the prior art. At the same time, the static friction generated by the tight pressing makes the shapes of the upper die 1 and the lower die 2 more stable, and the structural deformation due to aluminum pressure is not easy to occur; for example, in the existing die, the inside part of the die hole 4 of the lower die 2 is easy to deviate due to uneven pressure on the left and right sides, resulting in unqualified wall thickness of the produced profile. Therefore, the extrusion die of the present application has strong stability and can effectively ensure the profile forming effect, thereby reducing the overall cost and improving the yield.

[0048] Further, for Figure 3The profile shown with local modeling structure A2, the die hole 4 has a local modeling forming part 8 corresponding to the local modeling structure A2. The position of the top column 7 is close to the local modeling forming part 8. The shunt hole 6 includes a local modeling shunt hole 13, which is opposite to the local modeling forming part 8. In the process of extrusion molding, the aluminum material entering the local modeling shunt hole 13 will be blocked and separated by the top column 7, so that the part of the aluminum material basically all enters the local modeling forming part 8, ensuring sufficient feeding and good molding. And in the design of the mold, the prior art generally adjusts the size, shape, position and the like of the shunt hole 6 to adjust the feeding, which is more complex, and the aluminum material passes through the shunt hole 6 and is no longer controlled, which is difficult to ensure the process stability; The scheme of the present application can more conveniently realize the adjustment of the local feeding according to the needs by adjusting the diameter and position of the top column 7, and the length range of the top column 7 covers the whole area from the shunt hole 6 to the die hole 4, which can provide more effective and stable flow control. According to the needs, the top column 7 can be integrally formed with the upper die 1, or can adopt a core structure, for example, a screw hole is formed in the corresponding position of the upper die 1, and the top column 7 has a section of screw column, so as to be screw-connected in cooperation, which is more convenient for adjustment or repair of the mold.

[0049] More specifically, for Figure 3 The profile shown also has at least one cavity structure A3, the die hole 4 has a cavity forming part 9 corresponding to the cavity structure A3, and the upper die 1 is further provided with a mold core 10 protruding on the side facing the lower die 2, and the mold core 10 corresponds to the cavity forming part 9. Figure 2 As shown, the outer side of the end of the mold core 10 is provided with a protruding working belt 11, the outer contour of the working belt 11 is the same as the inner contour of the cavity structure A3, and the working belt 11 is located in the cavity forming part 9, thereby forming the contours corresponding to the inner and outer sides of the cavity structure A3, so that the aluminum material extruded through the gap between the mold core 10 and the die hole 4 obtains the required shape. The shunt hole 6 includes a cavity shunt hole 12, which is arranged around the mold core 10 to ensure the feeding of the cavity forming part 9.

[0050] In the preferred embodiment, the lower die 2 is provided with a first empty knife groove 14, a second empty knife groove 15, a third empty knife groove 16 and a fourth empty knife groove 17 on the side away from the upper die 1 and around the die hole 4. The four empty knife grooves increase one by one to the outside, preferably, the second empty knife groove 15 increases the radius distance of 4.0mm relative to the contour of the die hole 4, the third empty knife groove 16 increases the radius distance of 6.5mm relative to the die hole 4, and the fourth empty knife groove 17 increases the radius distance of 8.5mm relative to the die hole 4. The use of this multi-stage empty knife can avoid surface extrusion marks and extrusion lines generated by friction between the profile and the mold when the profile is discharged.

[0051] In another preferred embodiment, a die cushion 18 is further included, which is arranged on the side of the lower die 2 opposite to the upper die 1, i.e. the discharge side. The die cushion 18 is provided with a through hole, which is at least larger than the outer contour of the profile, preferably larger than the outer contour of the fourth-order air gap 17, so that the profile does not come into contact with the die cushion 18 when being discharged. The die cushion 18 serves to increase the rigidity of the die, further reducing the elastic deformation of the die during extrusion.

Claims

1. An extrusion die with a top pillar, comprising an upper die (1) and a lower die (2) mounted in cooperation, characterized in that, The extrusion die produces a profile (A) with a U-shaped structure (A1); the lower die (2) is provided with a recessed welding chamber (3) on the side facing the upper die (1), and a through hole (4) is formed in the welding chamber (3), the shape of the hole (4) is the same as the outer contour of the profile (A), and the hole (4) has a U-shaped forming part (5) corresponding to the U-shaped structure (A1) of the profile (A); the upper die (1) is provided with a through hole (6), and the upper die (1) is provided with a top column (7) protruding from the side facing the lower die (2), and the top column (7) is located in the area surrounded by the U-shaped forming part (5); during the extrusion process, the end of the top column (7) tightly abuts against the welding chamber (3); the top column (7) is cylindrical; The profile (A) also has a local modeling structure (A2) at the middle position of the U-shaped structure (A1); the hole (4) has a local modeling forming part (8) corresponding to the local modeling structure (A2); the hole (6) includes a local modeling hole (13) opposite the local modeling forming part (8); the position of the top column (7) is close to the local modeling forming part (8), so that the aluminum entering the local modeling hole (13) is blocked and separated by the top column (7), and the part of the aluminum basically all enters the local modeling forming part (8) to ensure sufficient supply.

2. The extrusion die with a top pillar of claim 1, wherein, At least one of the two ends of the U-shaped structure (A1) of the profile (A) also has a cavity structure (A3); the hole (4) has a cavity forming part (9) corresponding to the cavity structure (A3); the upper die (1) is also provided with a mold core (10) protruding from the side facing the lower die (2), and the mold core (10) corresponds to the cavity forming part (9).

3. The extrusion die with a top pillar of claim 2, wherein, The outer side of the end of the mold core (10) is provided with a protruding working belt (11), the outer contour of the working belt (11) is the same as the inner contour of the cavity structure (A3), and the working belt (11) is located in the cavity forming part (9).

4. The extrusion die with a top pillar of claim 2, wherein, The hole (6) includes a cavity hole (12) surrounding the mold core (10).

5. An extrusion die with a top pin according to any one of claims 1-4, characterized in that, The local modeling structure (A2) is a U-shaped groove, and the opening direction of the U-shaped groove is the same as the opening direction of the U-shaped structure (A1) of the profile (A).

6. An extrusion die with a land as claimed in any one of claims 1 to 4, wherein, The lower die (2) is provided with a first air knife groove (14), a second air knife groove (15), a third air knife groove (16) and a fourth air knife groove (17) around the hole (4) on the side away from the upper die (1).

7. An extrusion die with a top pin as claimed in any one of claims 1 to 4, wherein, It also includes a mold pad (18) provided on the side of the lower die (2) away from the upper die (1).

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