Method for predicting two-dimensional variable camber bending recovery of small-diameter thick-wall pipe

A technique for bending springback, predicting methods, applied in the direction of testing material strength, etc. using a stable bending force applied

Inactive Publication Date: 2013-12-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] In order to overcome the insolvency of the existing small-diameter thick-walled pipe two-dimensional variable curvature bending springback problem, the present invention provides a small-diameter thick-walled pipe two-dimensional variable curvature bending springback prediction method
It can predict the springback of small-diameter thick-walled pipes in two-dimensional variable curvature bending

Method used

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  • Method for predicting two-dimensional variable camber bending recovery of small-diameter thick-wall pipe
  • Method for predicting two-dimensional variable camber bending recovery of small-diameter thick-wall pipe
  • Method for predicting two-dimensional variable camber bending recovery of small-diameter thick-wall pipe

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Embodiment Construction

[0041] refer to Figure 1-8 . The specific steps of the method for predicting springback in two-dimensional variable curvature bending of small-diameter thick-walled pipes according to the present invention are as follows:

[0042] by Figure 5 The axis of an alloy steel two-dimensional variable curvature elbow is shown as an example. The outer diameter of the elbow is 3 mm, the inner diameter is 1 mm, and the axis length is 120 mm.

[0043] The specific implementation process is as follows:

[0044] 1. Given the three ordered shape value points (nodes) m of the axis of the elbow 1 、m 2 、m 3 , adjacent node m 1 、m 2 Between two tangent arc segments C 1 、C 2 Composed of two arc segments C 1 、C 2 Pass through the given two nodes m respectively 1 、m 2 , and at node m 1 、m 2The slope of the tangent at is equal to the slope of the axis at that node. In the same way, the other two tangent arc segments C are obtained 3 、C 4 . The axis of the elbow is discretized in...

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Abstract

The invention discloses a method for predicting two-dimensional variable camber bending recovery of a small-diameter thick-wall pipe, which is used for solving the technical problem of incapability of two-dimensional variable camber bending recovery of an existing small-diameter thick-wall pipe. According to the technical scheme, the method includes the steps of building a small-diameter thick-wall pipe bending recovery analytical model, performing discretization on the two-dimensional variable camber bent pipe along the axis, establishing a bending recovery radius relation expression by use of approximately pure bending recovery experiment, predicting the discrete bent pipe recovery, simply splicing the recovery predicted discrete bent pipe, and correcting the discrete bent pipe recovery splicing. The method can be used for predicting two-dimensional variable camber bending recovery of the small-diameter thick-wall pipe.

Description

technical field [0001] The invention relates to a two-dimensional variable curvature bending springback prediction method for pipes, in particular to a two-dimensional variable curvature bending springback prediction method for small-diameter thick-walled pipes. Background technique [0002] Small-diameter thick-walled pipes refer to pipes with an outer diameter of less than 10 mm and a ratio of outer diameter to wall thickness of less than 20. This pipe structure has the characteristics of high strength and rigidity, material saving, beautiful appearance, and good forming and processing performance. Therefore, the hollow structure mainly made of various metal pipes is widely used in the fields of aerospace, ships, vehicles, petrochemicals, construction and pressure vessels. After the pipe is bent and unloaded, it will inevitably produce a certain amount of springback, which will seriously affect the precision and efficiency of pipe bending production. Especially for pipe b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 张深吴建军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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