Manufacture method of irregular pipe

A manufacturing method and technology for pipe fittings, which are applied in the field of pipe manufacturing, can solve the problems of large heating times, large grain size, long production cycle of the main pipe, poor process repeatability, etc., so as to achieve less cutting allowance and improve material utilization rate. , repeatable effect

Active Publication Date: 2012-10-31
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (2), the manufacturing cycle is long and the production efficiency is low
Since the inner hole of the pipe fittings is completely formed by machining methods in the later stage, the amount of machining is extremely large, resulting in a long production cycle for the main pipe.
[0010] (3), the product quality is unstable, the scrap rate is high, and the process reproducibility is not strong
[0011] (4), the forging process is complicated
Excessive heating times can easily lead to coarse grain size; in addition, once cracks appear, crack repair should be carried out immediately

Method used

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  • Manufacture method of irregular pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0109] according to Figure 10 As shown, a manufacturing method of a nuclear power main pipe forging with a nozzle is as follows:

[0110] 1) Prepare steel ingot: Prepare a prismatic TP316LN material steel ingot with a nominal weight of 20000kg and a height of H1, such as figure 1 shown;

[0111] 2) Closed upsetting: put the above-mentioned steel ingot into the mold for closed upsetting, and the heating temperature is 1150°C to 1250°C. The shape of the forging after upsetting is as follows: figure 2 As shown, the specification is Φ1 in diameter and H2 in height;

[0112] 3) Reverse extrusion piercing: use the extrusion shaft to extrude the above steel ingot to form the inner hole of the steel ingot, and then cut off the bottom, the obtained forging shape is as follows image 3 As shown, the specification is that the diameter of the inner hole is Φ3, the outer diameter is Φ2, and the height is H3;

[0113] 4) Extruded pipe fittings: Extrude the above perforated forgings a...

Embodiment 2

[0122] The steps are basically the same as those in Embodiment 1, except that the forming sequence of the first nozzle and the second nozzle in the above 6) and 7) is changed, that is, the first nozzle in step 6) is carried out in the manner shown in Figure 7, Then in step 7) the other nozzle in the remaining position in Fig. 6 is formed.

Embodiment 3

[0124] according to Figure 9 As shown, a manufacturing method of a nuclear power main pipe forging with a nozzle is as follows:

[0125] 1) will be as Figure 4 The material shown is a TP316LN seamless steel tube billet machined, sharpened and ready for forming nozzles.

[0126] 2) Upsetting and extrusion forming the first nozzle: the above-mentioned pipe fittings are formed into the first nozzle by upsetting extrusion process, that is, the two ends of the pipe fittings move towards each other at a certain speed, and the material in the heating zone on the pipe wall is under the constraint of the mold Flow out from the opening on the nozzle to form a nozzle. The heating temperature is 950 ° C ~ 1200 ° C. The shape of the obtained forging is shown in Figure 5. The specification is that the total length is H5, and the distance from the center line of the nozzle to one side is H6. The inner radius and outer radius are R4 and R5 respectively, R4=(Φ4) / 2, R5=(Φ5) / 2;

[0127] 3) ...

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Abstract

The invention discloses a manufacture method of an irregular pipe. The manufacture method comprises the steps of: S1, carrying out upsetting extrusion on a straight pipe so as to form a first pressure inlet on the surface of the straight pipe; S2, carrying out upsetting extrusion on the straight pipe with the first pressure inlet so as to form a second pressure inlet on the surface of the straight pipe, wherein the second pressure inlet and the first pressure inlet form a first angle along the peripheral direction; and S3, bending the straight pipe with the first pressure inlet and the second pressure inlet, thus forming a preset curvature between the first pressure inlet and the second pressure inlet. According to the manufacture method of the irregular pipe, the internal hole of the pipe can be directly formed, and therefore the problems that in the prior art, the manufacture period is long and the material utilization is relatively low caused by manually cutting the internal hole by mechanically processing can be solved; and moreover, the heating is less frequently carried out during the operation, and the cutting allowance is low, and the percent of pass is high, and the quality performance is stable.

Description

technical field [0001] The invention relates to the field of pipe manufacturing, in particular to a method for manufacturing special-shaped pipe fittings. Background technique [0002] Pressure-bearing and corrosion-resistant pipelines are important components in nuclear power, petrochemical and other industrial facilities. The reactor coolant main pipeline (referred to as the main pipeline) is a large-diameter thick-walled steel pipe with a nozzle connected to the reactor pressure vessel, steam generator and reactor coolant pump in the nuclear island. In the second-generation or second-generation semi-nuclear power technology, the forming and manufacturing of the main pipe are all adopted the method of centrifugal casting. The third-generation nuclear power technology AP1000 introduced in my country requires the main pipeline to be made of ASME SA376-TP316LN austenitic stainless steel, and requires integral forging. The main pipe used in the third-generation nuclear power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/15B21C23/02
Inventor 林峰王欣潘际銮雷丙旺张磊张婷冯潇
Owner TSINGHUA UNIV
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