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A kind of double-layer composite pipe and its preparation method

A double-layer composite and tube blank technology, which is applied in the field of pipe fittings processing, can solve problems such as cracking and thinning of the forming area of ​​pipe fittings, and achieve the effects of convenient and cheap preparation, simple preparation, and simple process realization

Active Publication Date: 2019-06-25
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing double-layer metal pipe processing adopts the hydraulic expansion method. In the hydraulic bulging process, the pipe end seal is generally sealed by mechanical compression, that is, the two ends of the double-layer metal pipe are compressed and deformed to achieve sealing. This sealing method makes the inner and outer layers When the metal tube blank is bulging, the material at both ends cannot flow to the forming area to form a feeding effect. Therefore, the forming area of ​​the pipe fittings hydroformed in this way is severely thinned, and even ruptures

Method used

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  • A kind of double-layer composite pipe and its preparation method
  • A kind of double-layer composite pipe and its preparation method
  • A kind of double-layer composite pipe and its preparation method

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Embodiment 1

[0040] Such as Figure 1-4 As shown, the present embodiment provides a method for forming a double-layer composite pipe, comprising the following steps:

[0041] Assembly: the hollow aluminum alloy tube blank 2 is placed inside the hollow carbon steel tube blank 1 to form a double-layer composite tube blank 3;

[0042] Specifically, such as figure 1 As shown, the welding joint 4 of the hollow carbon steel pipe billet 1 needs to be cleaned and flattened. The inner diameter is designed according to the basic size of the outer diameter of the hollow aluminum alloy pipe billet 2, and the clearance of the base shaft is matched with the B11 grade design, and the same precision level is used to control the welding of the hollow carbon steel pipe billet. 1 cylindricity. Then, two hollow carbon steel tube blanks 1 and hollow aluminum alloy tube blanks 2 of different materials are assembled to obtain a double-layer composite tube blank 3 .

[0043] Preferably, the hollow carbon steel...

Embodiment 2

[0064] This embodiment adopts the method as described in Example 1. The hollow carbon steel pipe billet 1 adopts Q235 plate welded steel pipe, and the hollow aluminum alloy pipe billet 2 adopts AA5052 extruded pipe material. Through the above steps, the convex ring pipe fittings are formed. For details, see Figure 5 .

[0065] In addition, before the AA5052 pipe is formed, it can also be subjected to heat treatment, specifically annealing treatment, in order to increase the elongation. The strengthening of AA5052 can be strengthened by strain, that is, the greater the degree of bulging, the better the strengthening effect . The main functions of AA5052 in this embodiment are anti-corrosion, energy absorption and weight reduction, while the stiffness and strength of the components are mainly realized by Q235 plate welded steel pipes.

Embodiment 3

[0067] This embodiment adopts the method as described in Example 1. The hollow carbon steel pipe billet 1 adopts 304 stainless steel coil welded pipe, and the hollow aluminum alloy pipe billet 2 adopts AA6061 extruded pipe material. Through the above steps, hexahedral pipe fittings are formed. For details, see Image 6 .

[0068] In addition, before the AA6061 pipe is formed, heat treatment can be carried out to strengthen the material. It should be understood that solution treatment is selected for the heat treatment of the 6-series and 7-series aluminum alloy extruded pipes.

[0069] Immediately after solution treatment, it is assembled with 304 stainless steel coil welded pipe and expanded into the target shape, and then artificially aged to restore the strength of the aluminum alloy pipe. The artificial aging conditions of AA6061 pipe fittings will not affect the material properties of 304 stainless steel, which is also an important reason why they can be used in combinati...

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Abstract

The invention provides a double-layer composite pipe and a forming method thereof in order to solve the problem that in the prior art, as the contraction ratios of double-layer metal pipes are different and the machining process is complex, a complex-structure component can not be formed. The preparation method of the double-layer composite pipe includes the following steps that assembling is conducted, specifically, a hollow aluminum alloy pipe blank is arranged inside a hollow carbon steel pipe blank to form a double-layer composite pipe blank; forming is conducted, specifically, the double-layer composite pipe blank is arranged in an extrusion space, the extrusion space can be matched with the double-layer composite pipe blank, and a cavity in a target shape is formed; the hollow aluminum alloy pipe blank of the double-layer composite pipe blank is filled with medium particles; pressure is applied to the medium particles in the axial direction of the two ends of the double-layer composite pipe blank; and the double-layer composite pipe blank deforms to fill the cavity, and the double-layer composite pipe is formed. The double-layer composite pipe is easy to prepare, good in performance and capable of being used for manufacturing complex-structure pipe fittings.

Description

technical field [0001] The invention relates to the technical field of pipe fitting processing, in particular to a double-layer composite pipe and a preparation method thereof. Background technique [0002] As a common fluid conveying device for gases, liquids, powders, etc., pipelines are widely used in various fields such as aerospace, transportation, automobiles, city gas, water supply and heating systems, as well as metallurgy, petroleum, chemical industry, and electric power. With the continuous development of the national economy and the improvement of people's living standards, as well as the expansion of industrial construction and residential construction, the performance requirements for pipelines are also increasing. On the basis of ensuring rigidity, they must also have good corrosion resistance and High temperature performance, etc. [0003] The bimetallic composite pipe is composed of two different metal pipes. The inner and outer pipes are tightly combined th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D31/00
CPCB21D31/00
Inventor 董国疆陈孟杰陈光朱良金
Owner YANSHAN UNIV
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