Manufacturing method of large-diameter special section pipe

A special-shaped pipe fitting and manufacturing method technology, which is applied in the field of metal pipe fitting manufacturing, can solve the problems of low yield, long processing cycle, and high energy consumption, and achieve the effects of increasing yield, shortening manufacturing cycle, and saving materials

CN105945086AInactive Publication Date: 2016-09-21CHINA IRON & STEEL RES INST GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-09-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of metal pipe manufacturing, and specifically, relates to a manufacturing method of a large-diameter complex-shaped metal special section pipe through an additive manufacturing method. The method comprises the following steps: performing solid modeling of a pipe through a computer three-dimensional modeling software, and considering enough allowance for subsequent processing during design; making a pipe blank according to the obtained three-dimensional computer model through adoption of an additive manufacturing method (also called 3D printing), such as laser melting deposition (LMD) or laser engineered net shaping (LENS), suitable for metal materials; and carrying out proper precision machining of the pipe blank through conventional methods such as machining or grinding. Compared with a traditional technical method, such as casting, forging, and machining, the method has the advantages that a metal structure and mechanical properties of a pipe become more uniform and stable, the machining difficulty is greatly reduced, the manufacturing process is quickened, and massive raw materials are saved.
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Description

technical field

[0001] The invention belongs to the technical field of metal pipe fitting manufacturing, and particularly relates to a method for manufacturing a metal special-shaped pipe fitting with a large diameter and a complex shape by means of an additive manufacturing method. Background technique

[0002] Nuclear power, military, aerospace and other industries demand a large number of special-shaped pipe fittings with high performance requirements, difficult material processing, and complex shapes, which are extremely difficult to manufacture, and often ordered in small quantities. This makes the manufacturing cost of such special-shaped fittings high and the lead time long.

[0003] Take the main pipe used in the third-generation nuclear power technology AP1000 as an example. The height of the nozzle is 387mm, the outer diameter of the nozzle is 616mm), and they are spaced apart in the axial direction and at an angle of 45° in the circumferential direction. The pip...

Examples

Embodiment 1

[0037] like figure 2 As shown, using the present invention to produce the main pipeline of AP1000 nuclear power plant, its process comprises the following steps:

[0038] (1) Use the computer 3D design software to carry out the solid modeling of the pipe fittings in the hot section of the main pipeline of the AP1000 nuclear power plant;

[0039] (2) Using the laser melting deposition (LMD) additive manufacturing (or 3D printing) method, the three-dimensional computer model of the pipe fittings is made into a pipe blank;

[0040] (3) The pipe blank is properly finished by conventional means such as machining or grinding to obtain a large-diameter special-shaped pipe fitting product.

[0041] Finally, the product performance test is carried out, and the mechanical properties of the product are shown in Table 1.

[0042] Table 1 Mechanical properties of products

[0043]

Embodiment 2

[0045] like image 3 As shown, using the present invention to produce a nuclear power plant voltage stabilizer wave tube, its technology includes the following steps:

[0046] (1) Use the computer three-dimensional design software to carry out the solid modeling of the wave tube;

[0047] (2) Using the laser net shape manufacturing (LENS) additive manufacturing (or 3D printing) method, the three-dimensional computer model of the pipe fittings is made into a pipe blank;

[0048] (3) The pipe blank is properly finished by conventional means such as machining or grinding to obtain a large-diameter special-shaped pipe fitting product.

[0049] Finally, the product performance test is carried out, and the mechanical performance indicators of the product are shown in Table 2.

[0050] Table 2 Mechanical properties of products

[0051]