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Metal bellows with axial stiffeners, and forming method

A technology of metal corrugated pipes and reinforcing ribs, applied in the direction of hoses, pipes, pipes/pipe joints/pipe fittings, etc., can solve the problems of breaking at the trough, reducing the service life of the hose, shortening the service life, etc., and achieves a simple forming method, The effect of improving the service life

Active Publication Date: 2017-12-01
JIANGSU HONGYUAN PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the end of the bellows is fixed, the waveform at the end is repeatedly squeezed and deformed at a certain bending angle under the action of an external force, and the repeated bending deformation exceeds its own fatigue strength limit, so high-strain and low-cycle damage is likely to occur, reducing the overall root hose lifespan
[0003] In the actual application of the corrugated metal hose currently on the market, one end is fixed and the other end is freely connected, and the bending rigidity is small. When bending deformation occurs, the deformation of the connecting end is large. Extrusion deformation is easy to occur. When axial elongation deformation occurs, the deformation is mainly concentrated at the trough position, and the trough position is often at a small angle, and the transition is not smooth, resulting in easy fracture at the trough, resulting in damage and shortening the service life.

Method used

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  • Metal bellows with axial stiffeners, and forming method
  • Metal bellows with axial stiffeners, and forming method
  • Metal bellows with axial stiffeners, and forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] First, design the sheet size of the tube blank (including the height, width and wave number of the axial wave) according to the required corrugated metal hose, and process the upper and lower rolls according to the size, and roll on a special rolling mill, and the sheet is in the feeding machine. It is sent into the mold under the action, and the sheet is rolled into the required wavy sheet with the rolling of the roll. figure 1 shown. Afterwards, the plate is rolled and welded to form an axially corrugated tube blank as attached figure 2 shown. Among them, a corrugated hose with a nominal diameter of D = 80mm is selected, and the number of axial waves of the plate is n = 12. Therefore, the distance l between the two rolls can be determined according to the number of axial waves and the nominal diameter of the hose. 1 =20.93mm, roll radius r=2.5mm, straight edge section between two rolls l 2 =10.93mm, the arc length l of a single waveform 3 = 30.55mm. Work piece ...

Embodiment 2

[0037] The operation process is the same as that of Example 1, and the corrugated metal hose with different wave parameters (wave height and wave width), as shown in Figure 2, has a diameter of D=80mm, wave height h of 8mm, wave width of W=5mm, and wave number n=20 The flexural rigidity of the metal bellows with reinforced ribs is calculated to be 3.92MN·m. And the common metal bellows with diameter D=80mm, wave height h is 8mm, wave width W=5mm, wave number n=20 without reinforcement ribs, its flexural rigidity is calculated to be 2.11MN·m. Therefore, the new metal bellows with ribs has greater bending stiffness, and at the same time avoids the damage caused by the mutual extrusion between the waves.

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Abstract

The invention provides a metal bellows with axial stiffeners. The metal bellows is a corrugated metal hose with the axial stiffeners at the wave trough position. The forming method of the corrugated metal hose comprises the steps of rolling plates to form corrugation, then curling and welding, and finally bulging on a bulging machine; flat expanding axial waves at the wave peak position so that the wave peak position has no the axial stiffeners, while the axial stiffeners at the wave trough position are reserved, so that the corrugated metal hose with the axial stiffeners at the wave trough position is obtained. The bending deformation rigidity of the corrugated metal hose is high; in case of axial elongation deformation, the deformation mainly focuses on the wave peak position, while the wave trough position is hardly deformed; and the service life of the corrugated metal hose is prolonged effectively.

Description

technical field [0001] The invention relates to a corrugated pipe and a processing and forming method. Background technique [0002] As a high-quality flexible pipe in modern industrial pipelines, metal corrugated hoses are widely used for their good flexibility, fatigue resistance, high pressure bearing, good temperature resistance, corrosion resistance, and strong sealing. Petroleum, aviation, aerospace, chemical, electric power, transportation and other industries, with the development of modern industry, the traditional corrugated metal hose can no longer meet the quality and performance requirements of some harsh working conditions. Offshore heavy oil thermal recovery is the latest application field of corrugated metal hoses. In the process of deep sea oil exploitation, corrugated metal hoses are used to connect mobile gas injection barges and deep sea oil production platforms. Since the end of the bellows is fixed, the waveform at the end is repeatedly squeezed and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/08B21D13/04B21D26/033F16L11/15
CPCB21C37/0803B21D13/04B21D26/033F16L11/15
Inventor 骆俊廷骆姝伊郝增亮顾勇飞张春祥
Owner JIANGSU HONGYUAN PIPES
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