CN-121988854-A - Processing method for lining metal pipe with lining layer in complex shape

CN121988854ACN 121988854 ACN121988854 ACN 121988854ACN-121988854-A

Abstract

The invention discloses a processing method of a lining layer with a complex shape on a metal pipe, which comprises the steps of processing a metal pipe and a lining layer, wherein the shape of the outer wall of the lining layer is consistent with that of the inner wall of the metal pipe, a certain gap can be formed between the metal pipe and the lining layer after the metal pipe and the lining layer are assembled, filling the lining layer into the metal pipe, vacuumizing the space between the metal pipe and the lining layer, sealing the two ends, keeping the interlayer between the metal pipe and the lining layer in vacuum, placing the metal pipe in a container, filling high-pressure gas into the container, heating the gas in the container, preserving heat and pressure for a period of time, enabling contact surfaces of the metal pipe and the lining layer to be integrated by diffusion welding, decompressing the container, cooling the metal pipe, and taking out the metal pipe after cooling. According to the method, the gas medium in the container is utilized to heat and pressurize the inner surface and the outer surface of the pipe to realize diffusion welding, the inner wall and the outer wall of the lining layer can be effectively lined in the metal pipe under the condition of complex shapes, and the lining layer is tightly combined and is not easy to fall off and slide.

Inventors

JIA CHUAN
GONG HOUJUN
ZAN YUANFENG
HUANG YANPING
ZHUO WENBIN
TANG JIA

Assignees

中国核动力研究设计院

Dates

Publication Date: 20260508
Application Date: 20260310

Claims (12)

1. A processing method for lining a metal pipe with a lining layer with a complex shape is characterized by comprising the following steps: Firstly, processing a metal pipe (1) and an inner liner (2), wherein the shape of the outer wall (21) of the inner liner (2) is consistent with that of the inner wall (11) of the metal pipe (1), and a certain gap can be formed between the metal pipe and the inner liner after the metal pipe and the inner liner are assembled; Step two, the lining layer (2) is arranged in the metal tube (1), and after the vacuum is extracted between the metal tube (1) and the lining layer (2), two ends of the metal tube are sealed, so that an interlayer between the metal tube (1) and the lining layer (2) is kept in vacuum; step three, placing the metal tube (1) in a container, and filling high-pressure gas into the container; Heating the gas in the container, and preserving heat and pressure for a period of time to enable the contact surfaces of the metal pipe (1) and the inner liner (2) to be integrated by diffusion welding; and fifthly, decompressing the container, cooling the metal pipe, and taking out the metal pipe after cooling.
2. The method for producing a lining with complex shape according to claim 1, wherein in the first step, the gap formed between the lining layer (2) and the metal tube (1) is less than 0.1mm after the lining layer is assembled.
3. The method for processing the lining with the complex shape of the metal tube according to claim 1, wherein the interlayer vacuum degree between the outer wall (21) of the lining layer (2) and the inner wall (11) of the metal tube (1) in the second step is lower than 10 -3 Pa.
4. The method for processing the lining with the complex shape in the metal tube according to the claim 1, wherein in the step two, the two ends of the lining layer (2) and the inner wall (11) of the metal tube (1) are sealed by welding.
5. The method of claim 1, wherein the vessel is a pressure furnace with a heating device disposed therein.
6. The method of claim 5, wherein the heating means comprises an electric heater wire.
7. The method of lining a metal tube with a complex-shaped lining according to claim 1, wherein the shape of the inner wall of the metal tube (1) includes, but is not limited to, a round shape or a square shape.
8. The method for processing a lining with a complex shape in a metal tube according to claim 1, wherein the inner wall shape of the lining layer (2) comprises a polygon or a combination of various patterns.
9. The method for processing a lining with a complex shape in a metal tube according to claim 1, wherein the material of the lining layer (2) comprises a metallic material or a non-metallic material.
10. The method for processing the lining with the complex shape of the metal tube according to claim 1, wherein the outer wall (21) of the lining layer (2) is provided with a groove, and the depth of the groove does not exceed the thickness of the lining layer at the position.
11. The method for processing a lining with a complex shape in a metal tube according to claim 1, wherein the axial length of the lining layer (2) is smaller than the axial length of the metal tube (1).
12. The method for processing the lining with the complex-shape lining layer on the metal tube according to claim 1, wherein the metal tube (1) in the fifth step can be directly used after being taken out or can be used after being reprocessed.

Description

Processing method for lining metal pipe with lining layer in complex shape Technical Field The invention relates to the technical field of pipeline processing, in particular to a processing method for lining a metal pipe with a lining layer with a complex shape. Background Common metal pipes (round or special pipes) require lining of the inner wall with various liners for various reasons, so that the inner and outer layers of the pipe meet different performance requirements. The inner liner is usually attached to the inner wall of the metal pipe by a mechanical assembly and then expansion joint method, the process is simple, metallurgical bonding does not exist between the inner liner and the metal pipe, and the inner wall and the outer wall of the inner liner are usually smooth structures, as shown in fig. 1. As the internal machining of the lining layer or other more complex shapes is required in certain use cases, as shown in fig. 2. When it is required to line the inner wall of the metal pipe with an inner liner layer of a more complex shape, the conventional processing method is difficult to process, and the method of welding or expansion joint after mechanical assembly has a plurality of limitations. Disclosure of Invention The invention aims to provide a processing method for lining a metal pipe with a lining layer with a complex shape, which aims at solving the problem that the lining layer is difficult to be provided with the lining layer with the complex shape on the inner wall of the metal pipe. The invention is realized by the following technical scheme: The invention provides a processing method of lining a metal pipe with a lining layer with a complex shape, which comprises the following steps: Step one, processing a metal pipe and an inner liner, wherein the shape of the outer wall of the inner liner is consistent with that of the inner wall of the metal pipe, and a certain gap can be formed between the two after the assembly; Step two, the lining layer is arranged in the metal tube, and after the vacuum is extracted between the metal tube and the lining layer, two ends of the metal tube and the lining layer are sealed, so that the interlayer between the metal tube and the lining layer is kept in vacuum; Step three, placing the metal tube in a container, and filling high-pressure gas into the container; heating the gas in the container, and preserving heat and pressure for a period of time to enable the contact surfaces of the metal pipe and the inner liner to be integrated by diffusion welding; and fifthly, decompressing the container, cooling the metal pipe, and taking out the metal pipe after cooling. According to the technical scheme, the two ends of the lining layer are sealed after the small gap between the metal pipe and the lining layer is vacuumized, so that the interlayer between the metal pipe and the lining layer is kept in vacuum, then the metal pipe is placed in the container, high-pressure gas is filled in the container, the gas in the container is heated, the temperature and the pressure of the inner surface and the outer surface of the pipe are increased by utilizing the gas medium in the container, and the contact surfaces of the metal pipe and the lining layer are integrated by diffusion welding. As a further aspect of the present invention, in the first step, after the lining layer and the metal tube are assembled, a gap formed between the lining layer and the metal tube is less than 0.1mm. Through making the clearance that forms between inner liner and the tubular metal resonator be less than 0.1mm, under high temperature high pressure effect, the outer wall of inner liner can closely laminate with the inner wall of tubular metal resonator, is favorable to improving diffusion welding's quality. As a further scheme of the invention, the vacuum degree of the interlayer between the outer wall of the inner liner layer and the inner wall of the metal tube in the second step is lower than 10 -3 Pa. Through making intermediate layer vacuum between inner liner and the metal pipe be less than 10 -3 Pa, under this high vacuum environment, the quantity of gas molecule in the intermediate layer has been very rare, and later stage under the effect of high-pressure gas in the container, the outer wall of inner liner and the inner wall of metal pipe can form more inseparable contact, are favorable to improving diffusion welding's quality. As a further scheme of the invention, in the second step, the two ends of the inner liner layer and the inner wall of the metal tube are welded to form a seal. The inner liner is sealed with the inner wall of the metal pipe at both ends by adopting a welding mode, and the sealing mode has simple structure and convenient implementation, and does not need to be provided with an additional sealing structure or sealing elements and the like. As a further scheme of the invention, the container is a pressure furnace, and a heating device is arranged in the p