CN216420676U

CN216420676U - Hot extrusion die for improving welding quality of hollow industrial section

Info

Publication number: CN216420676U
Application number: CN202122138133.3U
Authority: CN
Inventors: 望运洲
Original assignee: Hubei Hongjian Light Alloy Material Technology Co ltd
Current assignee: Hubei Hongjian Light Alloy Material Technology Co ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2022-05-03
Anticipated expiration: 2031-09-06

Abstract

The utility model provides an improve hot extrusion die of hollow industry section bar seam quality includes mould and lower mould, goes up the mould and is equipped with the extrusion mouth, and the lower mould is equipped with crowded entry and establishes well core rod in crowded entry, is equipped with the expansion ring on well core rod middle section, and the expansion ring makes the local diameter grow in well core rod middle section. The utility model has the advantages that, under the extruder tonnage and the mould specification condition of not increasing, improve the mould scheme, make the indoor copper of extrusion process seam or aluminium extrusion medium become curve formula "increase extrusion by linear type relative" low pressure removal "and move to the seam pressure of extrusion medium improves the section bar seam quality in the increase mould.

Description

Hot extrusion die for improving welding quality of hollow industrial section

Technical Field

The utility model relates to a hollow industrial section bar former, concretely relates to improve hot extrusion die of hollow industrial section bar seam quality.

Background

For non-seamless extrusion, in order to improve the welding quality, the existing industrial section is mainly used for increasing the extrusion ratio by increasing the tonnage (the rod diameter) of an extruder, increasing the depth of a die welding chamber and reducing the extrusion speed to improve the welding quality; increasing the depth of the die weld chamber and reducing the extrusion speed still cannot meet the weld quality requirements for some thick section bars, thereby affecting the mechanical property and appearance quality of industrial section bars (lines with different colors at the weld position are shown in figure 1).

Disclosure of Invention

The utility model provides an improve hot extrusion die of hollow industry section bar seam quality under the condition that does not increase extruder tonnage and mould specification, improves the mould design, makes indoor copper of extrusion process or aluminium extrusion medium become curved "increase extrusion" by the relative "low pressure removal" of orthoscopic to the seam pressure of extrusion medium reaches the purpose that improves section bar seam quality in the increase mould.

The technical scheme for realizing the aim of the utility model is that the hot extrusion die for improving the welding quality of the hollow industrial section comprises an upper die and a lower die, wherein the upper die is provided with an extrusion opening, the lower die is provided with an extrusion opening and a central rod arranged in the extrusion opening, and the front section of the central rod divides the front section of the extrusion opening into a plurality of injection channels through a partition plate; the extrusion port is communicated with the tail section of the extrusion inlet, one end of the central rod locally or wholly enters the extrusion port, an expansion ring is arranged on the middle section of the central rod, and the local diameter of the middle section of the central rod is enlarged by the expansion ring.

Furthermore, a boss is arranged on the outer edge of an inlet of an extrusion port of the upper die, and the boss protrudes towards the extrusion port of the lower die;

and a gap is reserved between the expansion ring and the boss.

Further, the expanding ring is a cone or a frustum fixed on the central rod, and the large end face of the cone or the frustum faces the extrusion opening of the upper die.

Furthermore, a sleeve ring on one end of the central rod integrally enters the upper die extrusion port, and a groove is formed in the central rod between the sleeve ring and the expansion ring.

Furthermore, a ring platform is arranged on the inner edge of the inlet of the extrusion opening, and the boss is connected to the outer edge of the ring platform.

Furthermore, the ring platform is spaced from the edge of the boss at the connecting position of the boss.

Further, the large end face of the cone or the frustum is a vertical face or an inclined face inclined to the center.

Further, the inner surface of the upper die is in contact with the inner surface of the lower die through an arc.

The utility model has the advantages that:

1) the welding pressure can be effectively improved under the condition that the tonnage of the extruder is not increased, the welding pressure can be improved by 10-40% under the condition of the extruder with the same tonnage, the equipment investment and the die specification can be reduced, resources are saved, the production organization is facilitated, and the product quality is improved.

2) The utility model discloses a core invention point, well core rod be anterior segment to middle section grow slowly to improve the velocity of flow of material, thereby set up the increase that the expansion ring increases pressure reduction material velocity of flow realized at well core rod middle section in this patent, set up the expansion ring and be conflicting with current theory, current theory think must improve the velocity of flow just can realize better seam, nevertheless through patentee's trial and error, set up the velocity of flow that the expansion ring reduces and the pressure boost does not influence section bar shaping quality simultaneously yet, can also improve the seam quality, especially overcome the welding seam of the appearance of seam position in figure 1.

Drawings

FIG. 1 is an aluminum alloy produced using a prior art die.

Fig. 2 is a schematic longitudinal cross-sectional view of a conventional mold.

Fig. 3 is a front view of a conventional lower mold.

Fig. 4 is a longitudinal cross-sectional view of the mold of this patent.

Fig. 5 is a front view of the lower mold of this patent.

Fig. 6 is a schematic diagram of a conventional mold.

Fig. 7 is a working principle diagram of the mold of the patent.

FIG. 8 is a schematic longitudinal section of a preferred mold according to this patent.

As shown in the figure, an upper die 1, a lower die 2, an extrusion port 3, an extrusion inlet 4, a central rod 5, a partition plate 6, an injection channel 7, an expansion ring 8, a boss 9, a lantern ring 10, a groove 11, a ring table 12, a forming die hole 13 and a welding chamber 14.

Detailed Description

As shown in fig. 2 and 3, the existing hot extrusion die comprises an upper die 1 and a lower die 2, wherein the upper die 1 is provided with an extrusion port 3, the lower die 2 is provided with an extrusion port 4 and a central rod 5 arranged in the extrusion port 4, and the front section of the central rod 5 divides the front section of the extrusion port 4 into a plurality of injection channels 7 through a partition plate 6; the extrusion port 3 is communicated with the tail end of the extrusion inlet 4 (a welding cavity is formed, materials injected into the multiple injection channels 7 are welded in the welding chamber 14) and one end of the central rod 5 locally or integrally enters the extrusion port 3, the lantern ring 10 on one end of the central rod 5 integrally enters the extrusion port 3 of the upper die 1, and the central rod 5 is integrally thinned from the position far away from the extrusion port 3 to the position close to the extrusion port 3.

The working principle of the existing die is shown in fig. 6: the material passes through a plurality of injection channels 7 of the extrusion port 4, generally speaking, the section bar with four edges is provided with four injection channels 7, after being welded in the welding cavity, the section bar is formed after passing through a forming die hole formed by the lantern ring 10 and the inlet of the extrusion port 3, the traditional die design moves towards the forming die hole 13 in a basically linear or small bending way when being extruded, the flowing mode has the defect of low welding strength for the low resistance and the low welding quality of the thick-wall hollow section bar, and the welding position has lines with different colors at other positions as shown in figure 1.

As shown in fig. 4 and 5, the hot extrusion die for improving the welding quality of the hollow industrial section comprises an upper die 1 and a lower die 2, wherein the upper die 1 is provided with an extrusion port 3, the lower die 2 is provided with an extrusion port 4 and a central rod 5 arranged in the extrusion port 4, and the front section of the central rod 5 divides the front section of the extrusion port 4 into a plurality of injection channels 7 through a partition plate 6; extrude mouthful 3 with 4 end sections of crowded income mouth communicate (form the seam cavity, the material that a plurality of injection channels 7 injected into respectively welds in the seam cavity) just 5 one end part or whole entering of well core rod 5 the middle section on be equipped with expansion ring 8, expansion ring 8 make 5 middle section local diameter grow of well core rod, this paper 5 anterior segment, middle section, end section can equally divide well core rod 5 to form, also can not equally divide well core rod 5 to form, only set up expansion ring 8 and can make the seam pressure improve 10% and more.

Preferably, a boss 9 is arranged on the outer edge of an inlet of the extrusion opening 3 of the upper die 1, and the boss 9 protrudes towards the extrusion opening 4 of the lower die 2;

a gap is arranged between the expansion ring 8 and the boss 9, materials enter the extrusion opening 3 through the gap, and the materials are extruded by the boss 9 on the surface far away from the central rod 5.

Preferably, the expanding ring 8 is a cone or a frustum fixed on the central rod 5, the large end surface of the cone or the frustum faces the extrusion opening 3 of the upper die, and the expanding ring 8 is continuously expanded, that is, the expanding ring 8 continuously expands from a position far away from the extrusion opening 3 to a position close to the diameter of the expanding ring 8 on the central rod 5 of the extrusion opening 3.

Preferably, the lantern ring 10 that one end was served to well core rod 5 wholly gets into go up mould 1 extrude mouthful 3 the lantern ring 10 with well core rod 5 between the expansion ring 8 is equipped with recess 11, when the extrusion, the face that the material is close to well core rod 5 is extruded by recess 11, extrudees respectively the face that the material is close to well core rod 5 and the face of keeping away from well core rod 5 through boss 9 and recess 11, the extrusion of same position has time difference to further improve welding quality with the cooperation of expansion ring 8.

Preferably, go up mould 1 internal surface through the arc with lower mould 2 internal surface contacts, above-mentioned structure does benefit to the material flow, realizes the drag reduction.

Preferably, the inner edge of the inlet of the extrusion opening 3 is provided with a ring platform 12, the boss 9 is connected to the outer edge of the ring platform 12, and further preferably, the ring platform 12 has a distance with the edge of the boss 9 at the connecting position of the boss 9, and the distance is set and not set, so that the welding pressure is different by 0.7-1.6%.

Preferably, as shown in fig. 8, the large end surface of the cone or the frustum is a vertical surface or an inclined surface inclined to the center, and the inclined surface is arranged to increase the volume of the welding cavity, so that the expansion ring is suitable for relatively thick profiles, and the defect that the production of the thick profiles is affected due to insufficient material supply after the expansion ring 8 expands the diameter of the central rod 5 can be overcome.

A hot extrusion method for improving the welding quality of hollow industrial profiles comprises porous feeding, pre-compression and forming, and the working principle corresponding to the method is shown in figure 7;

the porous feeding is characterized in that a corresponding number of injection channels are arranged according to the number of cross sections of the hollow industrial section, and during feeding, the injection channels 7 simultaneously extrude the middle section of the inlet 4 (the front section, the middle section and the tail section of the extrusion inlet 4 correspond to the front section, the middle section and the tail section of the central rod 5, and the materials can be uniformly distributed or not) into the lower die 2 for feeding;

the pre-compression is carried out, materials supplied through a plurality of injection channels 7 enter the middle section of the extrusion port 4 and are extruded by the expansion ring 8 at the middle section of the central rod 5;

and in the forming, the material extruded by the expansion ring 8 enters the tail end of the extrusion inlet 4 and enters the extrusion outlet 3 of the upper die 1 through the tail end of the extrusion inlet for forming.

Preferably, the forming process also comprises internal and external extrusion; the inside and outside extrusion, after the material extruded by the expanding ring 8 enters the end section of the extrusion port 4, the inner surface (the surface of the groove 11 extruding to be close to the central rod 5) and the outer surface (the surface of the boss 9 extruding to be far away from the central rod 5) of the section are extruded under the matching of the groove 11 of the central rod 5 and the outer edge boss 9 of the inlet of the extrusion port 3.

The expanding ring 8 of the central rod 5 is designed into a trumpet shape (a cone or a frustum), a boss 9 is additionally arranged on the outer edge of the cross section of the lower die, and the maximum diameter of the expanding ring 8 is larger than the maximum outer section circle of the boss 9 of the lower die. The materials in the welding chamber can not directly enter the forming die hole in a linear manner, but are overturned in the welding chamber, and simultaneously, the materials and the groove 11 are pressed on two sides and extruded into the forming die hole, so that the welding pressure is greatly increased, and the welding quality is obviously improved.

Claims

1. A hot extrusion die for improving the welding quality of hollow industrial profiles comprises an upper die and a lower die, wherein the upper die is provided with an extrusion port, the lower die is provided with an extrusion port and a central rod arranged in the extrusion port, and the front section of the central rod divides the front section of the extrusion port into a plurality of injection channels through a partition plate; the extrusion port is communicated with the tail section of the extrusion inlet, and one end of the central rod partially or wholly enters the extrusion port, which is characterized in that: the middle section of the central rod is provided with an expansion ring, and the expansion ring enlarges the local diameter of the middle section of the central rod.

2. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 1, wherein: a boss is arranged on the outer edge of an inlet of an extrusion port of the upper die and protrudes towards the extrusion port of the lower die;

and a gap is reserved between the expansion ring and the boss.

3. A hot extrusion die for improving the quality of the weld of the hollow industrial section bar according to any one of claims 1 to 2, wherein: the expanding ring is a cone or a frustum fixed on the central rod, and the large end surface of the cone or the frustum faces the extrusion opening of the upper die.

4. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 3, wherein: the lantern ring on one end of the central rod integrally enters the upper die extrusion port, and a groove is formed in the central rod between the lantern ring and the expansion ring.

5. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 3, wherein: the inner edge of the inlet of the extrusion opening is provided with a ring table, and the lug boss is connected to the outer edge of the ring table.

6. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 5, wherein: the ring platform is arranged at the connecting position of the lug boss and has a distance with the edge of the lug boss.

7. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 3, wherein: the large end surface of the cone or the frustum is a vertical surface or an inclined surface inclined towards the center.

8. The hot extrusion die for improving the welding quality of the hollow industrial section bar as claimed in claim 1, wherein: the inner surface of the upper die is contacted with the inner surface of the lower die through an arc.