Die for nitrogen cooling of inner surface of aluminum extruded pipe

Abstract

The utility model discloses a die for nitrogen cooling of the inner surface of an aluminum extruded pipe, which relates to the field of pipe processing and comprises a flow guide channel, an upper die and a lower die. Slotted holes are formed in the flow guide channel and the upper die, cooling pipes are placed in the slotted holes, one end of each cooling pipe is connected with a distributor, and the other end of each cooling pipe is connected with a liquid nitrogen inlet; after liquid nitrogen is vaporized, nitrogen is blown to the inner surface of a pipe, a mold is cooled, the pipe is prevented from being oxidized, the quality of the inner surface of the pipe is improved, the mold can be cooled through liquid nitrogen vaporization, the strength of the mold is improved, and the service life of the mold is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of pipe processing, in particular to a die used for nitrogen cooling the inner surface of an aluminum extruded pipe. Background Art

[0002] Aluminum extruded pipe is an aluminum alloy pipe manufactured by extrusion process. It is suitable for producing pipes of various cross-sectional shapes and sizes. In the production process of aluminum extruded pipe, aluminum alloy billets are usually softened by heating and then extruded into long strips with the desired cross-sectional shape using an extrusion machine. This method can produce high-strength, lightweight, corrosion-resistant aluminum alloy pipes suitable for various industries and applications, including construction, power, automobile manufacturing, etc.

[0003] The surface finish of aluminum alloy pipes is particularly critical in the power industry and is one of its important quality indicators. Aluminum alloy pipes produced by traditional extrusion processes often cause the temperature of pipes, molds and ingots to rise due to high temperature and metal surface friction during thermoplastic deformation, so subsequent grinding treatment is required to remove oxidation and other adverse effects. However, if the surface finish can be guaranteed during the extrusion process and additional grinding treatment can be avoided, it can not only save costs and reduce labor intensity, but also significantly improve the market competitiveness of products.

[0004] In the prior art, during the extrusion process, high temperature easily causes aluminum alloy pipes to oxidize, and aluminum alloy easily adheres to the surface of the mold, which will cause surface defects such as scratches and burrs on the discharged pipes, directly affecting the surface quality of the product. In addition, excessive mold temperature may not only reduce the strength of the material, but also accelerate the deformation and damage of the mold, shortening the service life of the mold. In order to effectively control the temperature rise, an effective cooling method must be adopted to solve the above problems. Utility Model Content

[0005] In order to overcome the problem that during the extrusion process, high temperature easily causes oxidation of aluminum alloy pipes, and aluminum alloy easily adheres to the mold surface, which will cause surface defects such as scratches and burrs on the discharged pipes, directly affecting the surface quality of the products, the utility model provides a mold for nitrogen cooling the inner surface of aluminum extruded pipes.

[0006] The utility model is realized by the following technical scheme: a mold for nitrogen cooling the inner surface of an aluminum extruded pipe, comprising a guide channel, an upper mold and a lower mold; slots are provided on the guide channel and the upper mold, a cooling pipe is placed in the slot, one end of the cooling pipe is connected to a distributor, and the other end of the cooling pipe is connected to a liquid nitrogen inlet.

[0007] Preferably, the guide channel is positioned with the upper die and the lower die respectively by pins and connected by screws.

[0008] Preferably, radial slots are provided on the distributor in a radial direction.

[0009] Preferably, a plurality of radial slots are provided, and the plurality of radial slots are evenly distributed.

[0010] Preferably, it further comprises a cover plate, which is arranged on the upper mold and located at the upper part of the dispenser.

[0011] Preferably, the cooling tube is a copper tube.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model can realize that after liquid nitrogen is vaporized, nitrogen is sprayed onto the inner surface of the pipe, so as to cool the mold, prevent oxidation of the pipe, and improve the quality of the inner surface of the pipe. Liquid nitrogen vaporization can also cool the mold, thereby improving the strength and life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is the front view of the utility model.

[0015] Explanation of the accompanying drawings: 1. guide channel; 2. upper mold; 3. lower mold; 4. cooling pipe; 5. distributor; 6. cover plate; 7. screw; 8. liquid nitrogen inlet. DETAILED DESCRIPTION

[0016] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0017] refer to Figure 1 and 2 As shown, the utility model discloses a mold for nitrogen cooling the inner surface of an aluminum extruded tube. The mold comprises a guide channel 1, an upper mold 2, a lower mold 3, a cooling pipe 4, a distributor 5, a cover plate 6, screws 7 and a liquid nitrogen inlet 8.

[0018] Specifically, the guide channel 1, the upper die 2, and the lower die 3 are positioned by pins, and then connected by screws. When in use, the guide channel 1 and the upper die 2 are machined with slots, and the slots are used to place cooling pipes 4, wherein the cooling pipes 4 are copper pipes. One end of the cooling pipe 4 is connected to the distributor 5, and the other end is connected to the liquid nitrogen inlet 8. The distributor 5 is provided with a plurality of nitrogen cold slots, and the slots are radial and evenly distributed. There is a cover plate 6 on the distributor 5, and the cover plate 6 is fixed on the upper die 2 by screws 7. Liquid nitrogen is sprayed onto the inner wall of the pipe by the copper pipe 4 from the outlet on the distributor 5 by the inlet 8, plays the role of isolating air and preventing the oxidation of the pipe, and improves the purpose of the surface quality of the pipe. At the same time, the vaporization of liquid nitrogen also takes away part of the heat, plays the role of cooling the mold, and improves the strength and life of the mold.

[0019] It should be noted that the utility model is mainly used for round tubes, and can also be used for square tubes. When in use, the slots on the distributor need to be appropriately adjusted according to the shape of the square tube.

[0020] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A die for nitrogen cooling of the inner surface of an aluminum extruded tube, characterized in that: The invention comprises a flow guiding channel (1), an upper die (2) and a lower die (3); the flow guiding channel (1) and the upper die (2) are provided with slot holes, a cooling pipe (4) is placed in the slot hole, one end of the cooling pipe (4) is connected to a distributor (5), and the other end of the cooling pipe (4) is connected to a liquid nitrogen inlet (8).

2. The mold for nitrogen cooling the inner surface of aluminum extruded pipe according to claim 1, characterized in that: The guide channel (1) is respectively positioned with the upper die (2) and the lower die (3) by pins and connected by screws.

3. The mold for nitrogen cooling the inner surface of aluminum extruded tube according to claim 1, characterized in that: The distributor (5) is provided with radial slots in the radial direction.

4. The mold for nitrogen cooling the inner surface of aluminum extruded tube according to claim 3, characterized in that: There are a plurality of radial slots, and the plurality of radial slots are evenly distributed.

5. The mold for nitrogen cooling the inner surface of aluminum extruded tube according to claim 1, characterized in that: It also comprises a cover plate (6), which is arranged on the upper mold (2) and located on the upper part of the distributor (5).

6. The mold for nitrogen cooling the inner surface of aluminum extruded tube according to claim 1, characterized in that: The cooling tube (4) is a copper tube.

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