Reverse extrusion die protection structure and extruder

Abstract

The utility model discloses a reverse extrusion die protection structure and extruding machine, reverse extrusion die protection structure includes extruding seat, die shaft and die body, and the through air channel is passed in on the die shaft and is offered, and the through air channel extends along the length direction of die shaft, and the first end of die shaft is along radial and is offered with the gas guide channel, and the gas guide channel is linked together with the first end of through air channel, and the second end of die shaft is offered with the air ring groove on the outer periphery of the extrusion port of die body, and the air ring groove is linked together with the extrusion port of die body. The reverse extrusion die protection structure is offered with the through air channel on the die shaft, and the protection gas flows into the through air channel from the gas guide channel, and flows into the extrusion port of die body through the air ring groove, so as to carry out the protection to the product after extrusion, and the protection gas can form the protection layer on the surface of the product after extrusion, prevents the product after extrusion from contacting with air and oxidizing, and does not influence the subsequent process.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion press technology, and in particular relates to a reverse extrusion die protection structure and an extrusion press. Background Technology

[0002] Extrusion forming is a common forming method for aluminum alloy tubes and rods. Extrusion forming requires an extrusion press for production. There are two types of extrusion: forward extrusion and reverse extrusion. In forward extrusion, the extrusion shaft, driven by hydraulic pressure, pushes the cast ingot forward within the extrusion cylinder, forcing it out of the die to form a tube or rod profile. An extrusion pad is placed between the extrusion shaft and the aluminum cast ingot to prevent aluminum material from overflowing through the gaps. The difference between reverse extrusion and forward extrusion is that the position of the cast ingot relative to the extrusion cylinder remains unchanged during extrusion. The extrusion die shaft has a hollow structure, with the end of the hollow die shaft pushing the die inside the shaft. The die gradually moves from the head end to the tail end of the aluminum cast ingot, and the formed tube or rod profile is gradually formed within the hollow die shaft. The advantages of reverse extrusion are: no friction occurs between the cast ingot and the extrusion cylinder, thus no additional extrusion force is consumed; additionally, it offers advantages such as high dimensional accuracy, uniform mechanical properties, fast extrusion speed, high yield, and no coarse grain rings; it is particularly suitable for extruding hard aluminum alloy tubes and rods.

[0003] During the extrusion process of a reverse extruder, the extruded workpiece flows out from the cavity of the mold. Due to the high surface temperature of the extruded product, it will oxidize upon contact with air, affecting subsequent processes. Utility Model Content

[0004] The purpose of this invention is to provide a reverse extrusion die protection structure and an extruder to solve the problem that conventionally extruded products in the prior art are oxidized due to high surface temperature when in contact with air during extrusion.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a reverse extrusion die protection structure is provided, which includes an extrusion seat, a die shaft, and a die body, wherein:

[0007] The middle part of the mold shaft is provided with a material passage for the extruded product to pass through along the axial direction. The first end of the mold shaft is mounted on the extrusion seat through a connecting assembly. The second end of the mold shaft is connected to the mold body and is located at the extrusion port of the mold body.

[0008] An air passage is formed through the mold shaft, extending along the length of the mold shaft. A guide channel is formed radially at the first end of the mold shaft, and the guide channel is connected to the first end of the air passage. An air passage ring groove is formed on the outer periphery of the extrusion port of the mold body at the second end of the mold shaft, and the air passage ring groove is connected to the extrusion port of the mold body. Protective gas flows into the air passage through the guide channel and into the extrusion port of the mold body through the air passage ring groove to protect the extruded product.

[0009] Furthermore, the protective gas is nitrogen.

[0010] Furthermore, the extrusion seat includes a fixed base and a connecting seat. The fixed base has a first anti-rotation groove, and the connecting seat has a first through hole. A first anti-rotation component is provided at the first through hole corresponding to the first anti-rotation groove. The first anti-rotation component passes through the first through hole and is tightened into the first anti-rotation groove to fix the first end of the connecting seat to the fixed base to prevent rotation.

[0011] Furthermore, the connecting assembly includes a positioning part and a pressure sleeve, wherein:

[0012] The positioning part includes a positioning sleeve and a positioning bolt. The connecting seat has a threaded hole adapted to the positioning bolt. The positioning sleeve is sleeved on the outer side of the connecting seat. The middle part of the positioning sleeve has a second through hole. The shank of the positioning bolt passes through the second through hole and is tightened into the threaded hole to fix the positioning sleeve on the outer side of the connecting seat. The positioning sleeve is configured to position the pressure sleeve. The first end of the pressure sleeve abuts against the outer side of the second end of the mold shaft. The second end of the pressure sleeve has a stepped groove. When the positioning bolt is tightened, the head of the positioning bolt abuts against the stepped groove, thereby pressing and fixing the pressure sleeve to the second end of the mold shaft.

[0013] Furthermore, a buffer sleeve is provided on the outer side of the second end of the mold shaft. The buffer sleeve is located between the pressure sleeve and the connecting seat. The buffer sleeve is configured to prevent hard contact between the pressure sleeve and the connecting seat.

[0014] Furthermore, the connecting seat is provided with a second anti-rotation groove, and the buffer sleeve is provided with a third through hole corresponding to the second anti-rotation groove. A second anti-rotation component is provided at the third through hole corresponding to the second anti-rotation groove. The second anti-rotation component passes through the third through hole and is tightened in the second anti-rotation groove to fix the buffer sleeve to the connecting seat to prevent rotation.

[0015] Furthermore, an air inlet is provided on the outer end face of the mold shaft. The air inlet is located at the end of the air guide channel that is away from the air passage. The air guide channel is connected to the outside through the air inlet. The inner diameter of the air inlet is larger than the inner diameter of the air guide channel.

[0016] Secondly, an extrusion press is provided, which includes the aforementioned reverse extrusion die protection structure.

[0017] Compared with the prior art, the beneficial effects of the reverse extrusion die protection structure and the extruder are as follows:

[0018] 1) By opening an air passage on the mold shaft and a guide air channel is opened radially at the first end of the mold shaft, the guide air channel is connected to the air passage. An air passage ring groove is opened on the outer periphery of the extrusion port of the mold body. The protective gas flows into the air passage through the guide air channel and into the extrusion port of the mold body through the air passage ring groove to protect the extruded product. The protective gas can form a protective layer on the surface of the extruded product to prevent the extruded product from contacting the air and oxidizing, without affecting the subsequent processes.

[0019] 2) By providing a first anti-rotation groove on the fixed base, and the first anti-rotation component passing through the first through hole and being tightened into the first anti-rotation groove, the first end of the connecting seat is fixed to the fixed base to prevent rotation, thus providing a connection method with a simple structure and good anti-rotation effect.

[0020] 3) By setting a buffer sleeve between the pressure sleeve and the connecting seat, hard contact between the pressure sleeve and the connecting seat is avoided, further protecting the pressure sleeve and preventing damage. Attached Figure Description

[0021] To more clearly illustrate and understand the technical solutions in the embodiments of this utility model, the accompanying drawings used in the background technology and embodiment description of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional schematic diagram of the reverse extrusion die protection structure provided in this embodiment of the utility model;

[0023] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] To facilitate understanding of this utility model, a more complete description of it will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figure 1 and Figure 2 As shown, in this embodiment, a reverse extrusion die protection structure includes an extrusion base 10, a die shaft 20, and a die body 30. The die shaft 20 has an axially extending material passage 200 through its middle portion for the extruded product to pass through. The first end of the die shaft 20 is mounted on the extrusion base 10 via a connecting assembly 40. The second end of the die shaft 20 is connected to the die body 30 and located at the extrusion port of the die body 30. An airflow channel 204 is formed through the die shaft 20, and the airflow channel 204 extends along the die shaft 20. Extending along the length direction, the first end of the mold shaft 20 is provided with a radially open air guide channel 201, which is connected to the first end of the air passage 204. The second end of the mold shaft 20 is provided with an air passage ring groove 202 on the outer periphery of the extrusion port of the mold body 30, which is connected to the extrusion port of the mold body 30. Protective gas flows into the air passage 204 through the air guide channel 201 and into the extrusion port of the mold body 30 through the air passage ring groove 202, so as to protect the extruded product.

[0027] As can be seen, by opening an air passage 204 on the mold shaft 20 and providing a guide air passage 201 radially at the first end of the mold shaft 20, the guide air passage 201 is connected to the air passage 204, and an air passage ring groove 202 is provided on the outer periphery of the extrusion port of the mold body 30. The protective gas flows into the air passage 204 through the guide air passage 201 and into the extrusion port of the mold body 30 through the air passage ring groove 202, so as to protect the extruded product. The protective gas can form a protective layer on the surface of the extruded product to prevent the extruded product from contacting the air and oxidizing, without affecting the subsequent processes.

[0028] As one implementation method, the protective gas is nitrogen.

[0029] Specifically, nitrogen has low reactivity and can form a protective layer on the surface of the extruded product.

[0030] Of course, as another implementation method, the protective gas can also be other inert gases.

[0031] In one embodiment, the compression seat 10 includes a fixed base 11 and a connecting seat 12. The fixed base 11 is provided with a first anti-rotation groove 13, and the connecting seat 12 is provided with a first through hole 14. A first anti-rotation member 15 is provided at the first through hole 14 corresponding to the first anti-rotation groove 13. The first anti-rotation member 15 passes through the first through hole 14 and is tightened into the first anti-rotation groove 13 to fix the first end of the connecting seat 12 to the fixed base 11 to prevent rotation.

[0032] As can be seen, by providing a first anti-rotation groove 13 on the fixed base 11, and the first anti-rotation component 15 passing through the first through hole 14 and being tightened into the first anti-rotation groove 13, the first end of the connecting seat 12 is fixed to the fixed base 11 to prevent rotation, thus providing a connection method with a simple structure and good anti-rotation effect.

[0033] In one embodiment, the connecting assembly 40 includes a positioning part and a pressure sleeve 41, wherein: the positioning part includes a positioning sleeve 42 and a positioning bolt 43, the connecting seat 12 is provided with a threaded hole 44 adapted to the positioning bolt 43, the positioning sleeve 42 is sleeved on the outer side of the connecting seat 12, the middle part of the positioning sleeve 42 is provided with a second through hole, the shank of the positioning bolt 43 passes through the second through hole and is tightened in the threaded hole 44 to fix the positioning sleeve 42 on the outer side of the connecting seat 12, the positioning sleeve 42 is configured to position the pressure sleeve 41, the first end of the pressure sleeve 41 abuts against the outer side of the second end of the mold shaft 20, the second end of the pressure sleeve 41 is provided with a stepped groove 410, when the positioning bolt 43 is tightened, the head of the positioning bolt 43 abuts against the stepped groove 410, thereby pressing and fixing the pressure sleeve 41 to the second end of the mold shaft 20.

[0034] Specifically, both the positioning sleeve 42 and the pressure sleeve 41 are annular components.

[0035] As can be seen, by using the threaded connection between the positioning bolt 43 and the threaded hole 44, the positioning sleeve 42 is fixed on the outer side of the connecting seat 12, while the pressure sleeve 41 is pressed and fixed on the second end of the mold shaft 20, which saves installation space and improves pressing efficiency.

[0036] In one embodiment, a buffer sleeve 21 is provided on the outer side of the second end of the mold shaft 20. The buffer sleeve 21 is located between the pressure sleeve 41 and the connecting seat 12. The buffer sleeve 21 is configured to prevent hard contact between the pressure sleeve 41 and the connecting seat 12.

[0037] Specifically, the buffer sleeve 21 is a ring-shaped assembly.

[0038] It can be seen that by setting a buffer sleeve 21 between the pressure sleeve 41 and the connecting seat 12, hard contact between the pressure sleeve 41 and the connecting seat 12 is avoided, further protecting the pressure sleeve 41 and preventing damage.

[0039] In one embodiment, the connecting seat 12 is provided with a second anti-rotation groove 22, and the buffer sleeve 21 is provided with a third through hole 23 corresponding to the second anti-rotation groove 22. A second anti-rotation member 24 is provided at the third through hole 23 corresponding to the second anti-rotation groove 22. The second anti-rotation member 24 passes through the third through hole 23 and is tightened in the second anti-rotation groove 22 to fix the buffer sleeve 21 to the connecting seat 12 to prevent rotation.

[0040] As can be seen, by providing a second anti-rotation groove 22 on the connecting seat 12, and by having the second anti-rotation component 24 pass through the third through hole 23 and tighten it in the second anti-rotation groove 22, the buffer sleeve 21 is fixed to the connecting seat 12 to prevent rotation, providing a connection method with a simple structure and good anti-rotation effect.

[0041] In one embodiment, an air inlet 203 is provided on the outer end face of the mold shaft 20. The air inlet 203 is located at one end of the air guide channel 201 away from the air flow channel 204. The air guide channel 201 is connected to the outside through the air inlet 203. The inner diameter of the air inlet 203 is larger than the inner diameter of the air guide channel 201.

[0042] It can be seen that by providing an air inlet 203 on the outer end face of the mold shaft 20, and having an inner diameter larger than that of the air guide channel 201, sufficient gas source can be provided to the air guide channel 201, reducing the resistance when external gas enters the air guide channel 201, ensuring smooth gas flow, and improving the overall airflow efficiency.

[0043] Based on the aforementioned reverse extrusion die protection structure, an extruder is provided, including the aforementioned reverse extrusion die protection structure.

[0044] The aforementioned reverse extrusion die protection structure protects the product as it flows to the outlet of the die body 30 after extrusion:

[0045] The protective gas enters the air guide channel 201 through the air inlet 203 and flows into the air passage 204. It then flows into the extrusion port of the mold body 30 through the air ring groove 202. The low-activity nitrogen can form a protective layer on the surface of the extruded product, preventing the high-temperature extruded product from oxidizing upon contact with air, thereby optimizing the effect of water quenching in the subsequent equipment.

[0046] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above examples. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A protective structure for a reverse extrusion die, characterized in that, The reverse extrusion die protection structure includes an extrusion base, a die shaft, and a die body, wherein: The middle part of the mold shaft is provided with a material passage for the extruded product to pass through along the axial direction. The first end of the mold shaft is mounted on the extrusion seat through a connecting assembly. The second end of the mold shaft is connected to the mold body and is located at the extrusion port of the mold body. An air passage is formed through the mold shaft, extending along the length of the mold shaft. A guide channel is formed radially at the first end of the mold shaft, and the guide channel is connected to the first end of the air passage. An air passage ring groove is formed on the outer periphery of the extrusion port of the mold body at the second end of the mold shaft, and the air passage ring groove is connected to the extrusion port of the mold body. Protective gas flows into the air passage through the guide channel and into the extrusion port of the mold body through the air passage ring groove to protect the extruded product.

2. The reverse extrusion die protection structure according to claim 1, characterized in that, The protective gas is nitrogen.

3. The reverse extrusion die protection structure according to claim 1, characterized in that, The extrusion seat includes a fixed base and a connecting seat. The fixed base has a first anti-rotation groove, and the connecting seat has a first through hole. A first anti-rotation component is provided at the first through hole corresponding to the first anti-rotation groove. The first anti-rotation component passes through the first through hole and is tightened into the first anti-rotation groove to fix the first end of the connecting seat to the fixed base to prevent rotation.

4. The reverse extrusion die protection structure according to claim 3, characterized in that, The connecting assembly includes a positioning part and a pressure sleeve, wherein: The positioning part includes a positioning sleeve and a positioning bolt. The connecting seat has a threaded hole adapted to the positioning bolt. The positioning sleeve is sleeved on the outer side of the connecting seat. The middle part of the positioning sleeve has a second through hole. The shank of the positioning bolt passes through the second through hole and is tightened into the threaded hole to fix the positioning sleeve on the outer side of the connecting seat. The positioning sleeve is configured to position the pressure sleeve. The first end of the pressure sleeve abuts against the outer side of the second end of the mold shaft. The second end of the pressure sleeve has a stepped groove. When the positioning bolt is tightened, the head of the positioning bolt abuts against the stepped groove, thereby pressing and fixing the pressure sleeve to the second end of the mold shaft.

5. The reverse extrusion die protection structure according to claim 4, characterized in that, A buffer sleeve is provided on the outer side of the second end of the mold shaft. The buffer sleeve is located between the pressure sleeve and the connecting seat. The buffer sleeve is configured to prevent hard contact between the pressure sleeve and the connecting seat.

6. The reverse extrusion die protection structure according to claim 5, characterized in that, The connecting seat is provided with a second anti-rotation groove, and the buffer sleeve is provided with a third through hole corresponding to the second anti-rotation groove. A second anti-rotation component is provided at the third through hole corresponding to the second anti-rotation groove. The second anti-rotation component passes through the third through hole and is tightened in the second anti-rotation groove to fix the buffer sleeve to the connecting seat to prevent rotation.

7. The reverse extrusion die protection structure according to claim 1, characterized in that, An air inlet is provided on the outer end face of the mold shaft. The air inlet is located at the end of the air guide channel away from the air passage. The air guide channel is connected to the outside through the air inlet. The inner diameter of the air inlet is larger than the inner diameter of the air guide channel.

8. An extruder, characterized in that, The extruder includes a reverse extrusion die protection structure as described in any one of claims 1 to 7.

Images