RAFM molten steel cooling pipeline and forming process thereof

Abstract

The invention discloses an RAFM molten steel cooling pipeline and a forming process thereof. The RAFM molten steel cooling pipeline comprises a pipe body with a water cooling flow channel. The water cooling flow channel comprises a main flow channel located in the center of the pipe body, and a plurality of branch flow channels communicated with the main flow channel are evenly distributed on the periphery of the main flow channel; the forming process comprises the steps of linear cutting and the like. The cooling device is reasonable in structure and good in cooling effect, the cooling problem of the RAFM molten steel cold pipeline in the Tokamak nuclear fusion experiment device is reliably solved, and the quality and the yield of the RAFM molten steel cold pipeline are improved through optimization of the forming process.

Description

Technical Field

[0001] The invention relates to a water-cooling pipeline, in particular to a RAFM steel water-cooling pipeline and a forming process thereof. Background Art

[0002] A large number of RAFM steel water cooling pipes are required in the Tokamak nuclear fusion experimental device, such as Figure 1 and Figure 2 As shown in the figure, the RAFM steel water-cooling pipe is curved and usually designed with a square cross-section. As an important component of the cladding, the RAFM steel water-cooling pipe directly affects the cooling effect and safe service of the cladding. At present, there is still room for improvement in improving the cooling effect and forming process of the RAFM steel water-cooling pipe. Summary of the invention

[0003] The object of the present invention is, in a first aspect, to provide a RAFM steel water cooling pipeline with good cooling effect.

[0004] A RAFM steel water-cooling pipeline comprises a pipe body with a water-cooling flow channel; the water-cooling flow channel comprises a main flow channel located at the center of the pipe body, and a plurality of branch flow channels communicating with the main flow channel are evenly distributed on the periphery of the main flow channel.

[0005] The second aspect provides a forming process that can effectively ensure the forming quality of the above-mentioned RAFM steel water-cooling pipe.

[0006] A forming process for a RAFM steel water-cooling pipe, used for manufacturing a RAFM steel water-cooling pipe, comprises the following steps: (1) Place the RAFM steel bar on a lathe, turn the outer circle, and flatten the two end faces; (2) Drill a center thread hole on the RAFM steel bar to form a tube body; (3) Fix the right-angle support plate vertically on the wire cutting table; (4) Correct from the XY direction to make the molybdenum wire and the outer cylindrical surface of the tube parallel; (5) Pass the molybdenum wire through the central wire threading hole in step (2); (6) Use wire cutting to cut out the water cooling channel in the tube body; (7) Perform fluid polishing on the inner wall of the water-cooling channel.

[0007] The invention has reasonable structure and good cooling effect, and reliably solves the cooling problem of RAFM steel water-cooling pipes in a Tokamak nuclear fusion experimental device. The optimization of the forming process improves the quality and yield rate of the RAFM steel water-cooling pipes.

[0008] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a schematic diagram of the structure of the RAFM steel water cooling pipeline in the background technology; Figure 2 for Figure 1 AA cross-sectional structural diagram; Figure 3 Schematic diagram of the cross-sectional structure of the RAFM steel water-cooling pipe in this embodiment. DETAILED DESCRIPTION

[0011] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0012] See also Figure 3 The present embodiment provides a RAFM steel water-cooling pipe, comprising a pipe body 2 having a water-cooling flow channel 1. In order to solve the technical problem described in the background technology, the technical solution of the present embodiment is that the water-cooling flow channel 1 comprises a main flow channel 11 located at the center of the pipe body 2, and a plurality of branch flow channels 12 communicating with the main flow channel 11 are evenly distributed on the periphery thereof.

[0013] like Figure 3 As shown, this embodiment provides a petal-shaped water-cooling channel 1. It is foreseeable that the shape and length of the tube body 2, the main channel 11 and the branch channel 12 can be selected according to the cooling capacity, flow conductance and pressure difference, and it is sufficient to ensure that the tube body 2 has the main channel 11 and the branch channel 12. When water cooling is required, deionized water is passed into the water-cooling channel 1. Figure 1 and Figure 2 The RAFM steel water-cooling pipe shown in the figure increases the contact area between the water-cooling channel 1 and the deionized water to a large extent, thereby effectively improving the cooling effect of the RAFM steel water-cooling pipe.

[0014] This embodiment also provides a forming process for a RAFM steel water-cooling pipe, which is used to manufacture a RAFM steel water-cooling pipe, comprising the following steps: (1) Place the RAFM steel bar on a lathe, turn the outer circle, and flatten the two end faces; (2) Use a deep hole drill to drill a central threading hole with a diameter of 8 mm on the RAFM steel bar to form a tube body 2; (3) Fix the right-angle support plate vertically on the wire cutting table; (4) Correct from the XY direction to make the molybdenum wire and the outer cylindrical surface of the tube 2 parallel; (5) Pass the molybdenum wire through the central threading hole in step (2) and try to cut a circle with a diameter of 9 mm. The concentricity between the circle and the circle with an outer diameter of 40 mm is within 0.1 mm. (6) Using wire cutting to cut out the water cooling channel 1 in the tube body 2; Wire cutting is a process of electro-corrosion. High-frequency discharge occurs between the molybdenum wire and the tube 2, and the metal is melted at high temperature for cutting. The difficulty of wire cutting is usually determined by the physical properties of the material. Since the specific heat capacity and thermal conductivity of RAFM steel are greater than those of ordinary martensitic steel, the discharge time needs to be increased based on the parameters of ordinary martensitic steel, that is, the pulse width is increased, and other parameters are adjusted accordingly. The specific wire cutting processing parameters are: cutting height 1.2m; molybdenum wire diameter 0.25mm; pulse width: 500µs; pulse interval: 1:8; processing current: 8A; servo sampling comparison voltage: 35V; forced feed 0.5um / s; wire drum speed 50rad / s; cutting efficiency 32mm² / min.

[0015] (7) Perform fluid polishing on the inner wall of the water-cooling channel 1 (due to the increase in pulse width, the wire-cut surface shows obvious corrugated marks. Fluid polishing can effectively eliminate the corrugated marks and ensure the cooling effect of the RAFM steel water-cooling pipe).

[0016] By adopting the above-mentioned molding process, an integral water-cooling channel can be manufactured, which has a higher safety factor and is less prone to leakage. At the same time, compared with the ordinary casting process, it has the advantage of denser materials and lower manufacturing costs and difficulty.

[0017] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A RAFM steel water-cooling pipe, comprising a pipe body having a water-cooling flow channel, characterized in that: The water-cooling flow channel comprises a main flow channel located at the center of the tube body, and a plurality of branch flow channels communicating with the main flow channel are evenly distributed on the periphery of the main flow channel.

2. A forming process for a RAFM steel water-cooling pipe, for manufacturing the RAFM steel water-cooling pipe as claimed in claim 1, characterized in that: The following steps are involved: (1) Place the RAFM steel bar on a lathe, turn the outer circle, and flatten the two end faces; (2) Drill a center thread hole on the RAFM steel bar to form a tube body; (3) Fix the right-angle support plate vertically on the wire cutting table; (4) Correct from the XY direction to make the molybdenum wire and the outer cylindrical surface of the tube parallel; (5) Pass the molybdenum wire through the central wire threading hole in step (2); (6) Use wire cutting to cut out the water cooling channel in the tube body; (7) Perform fluid polishing on the inner wall of the water-cooling channel.

3. The forming process of the RAFM steel water-cooling pipe according to claim 2 is characterized in that: In the step (6), the processing parameters of wire cutting are: pulse width: 500µs; pulse interval: 1:8; processing current: 8A; servo sampling comparison voltage: 35V; forced feed 0.5um / s; wire drum speed 50rad / s; cutting efficiency 32mm² / min.

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