Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for accurately controlling size of large door-shaped three-dimensional stainless steel bent pipe

A precisely controlled, stainless steel technology for pipe bending

Active Publication Date: 2021-05-14
CHINA ERZHONG GRP DEYANG HEAVY IND
View PDF12 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for precisely controlling the size of a large door-shaped three-dimensional stainless steel elbow, which can not only eliminate the dimensional error caused by bending, but also solve the deformation problem caused by solid solution heat treatment, and ensure the dimensional accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for accurately controlling size of large door-shaped three-dimensional stainless steel bent pipe
  • Method for accurately controlling size of large door-shaped three-dimensional stainless steel bent pipe
  • Method for accurately controlling size of large door-shaped three-dimensional stainless steel bent pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 850°C, keep it warm for 2 hours, then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+2mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge block 10 to flatten one end of the gate bend, carry out solution heat treatment at a temperature of 1050°C, and immediately immerse the gate bend in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0031] Finally, check the size of the door-shaped elbow. The opening size is L-1mm, the height difference between the two ports is H+2mm, and the bending radius is within the al...

Embodiment 2

[0033] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 900°C, keep it warm for 2 hours, then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+4mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge block 10 to flatten one end of the gate bend, carry out solution heat treatment at a temperature of 1100°C, and immediately immerse the gate bend in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0034] Finally, check the size of the door-shaped elbow. The opening size is L+1mm, the height difference between the two ports is H+1mm, and the bending radius is within the al...

Embodiment 3

[0036] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 950°C, keep it warm for 2 hours, then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+5mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge block 10 to flatten one end of the gate bend, carry out solution heat treatment at a temperature of 1150°C, and immediately immerse the gate bend in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0037] Finally, check the size of the door-shaped elbow. The opening size is L+2mm, the height difference between the two ports is H+2mm, and the bending radius is within the al...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for accurately controlling the size of a large door-shaped three-dimensional stainless steel bent pipe. The method comprises the following steps of carrying out stress relief heat treatment after bending forming, checking the size, carrying out small deformation correction to ensure that the opening size of the door-shaped bent pipe is 2-5mm larger than the design nominal size, and then carrying out solid solution heat treatment. The stress relief heat treatment is firstly carried out after bending forming, residual stress in the bending forming process is fully released, then the size is checked, and small deformation correction can be conveniently carried out according to the checking result. Due to the fact that water enters the lower surface of the door-shaped steel pipe in the solid solution heat treatment process, the door-shaped steel pipe is provided with an offset angle, the opening size is shrunk by 2-5 mm in the rapid cooling process, the opening size of the door-shaped bent pipe is 2-5 mm larger than the design nominal size before the solid solution heat treatment, and the opening size after the solid solution heat treatment can meet the requirement.

Description

technical field [0001] The invention relates to the technical field of pipe bend processing, in particular to a method for precisely controlling the size of a large gate-shaped three-dimensional stainless steel pipe bend. Background technique [0002] The surge tube of the nuclear power plant voltage stabilizer is connected to the hot section of the primary coolant circuit of the reactor and the voltage stabilizer. Ensure that the working pressure of the main circuit of the nuclear island is stable. [0003] In order to improve the safety of nuclear power, the third-generation nuclear power technology designs the individual pipe sections of the surge tube of the voltage stabilizer to include two elbows and a door-shaped three-dimensional bend with a deflection angle, based on the consideration of thermal stratification during the operation of the wave tube , the deflection angle of the three-dimensional elbow is designed to be 2.5°, that is, the overall rotation of the elbo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/78
CPCC21D9/08C21D1/785
Inventor 陈红宇何宏宇尹蒙司晨亮
Owner CHINA ERZHONG GRP DEYANG HEAVY IND