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Method and computer program for analyzing wall thickness distribution of pipes

A technology of wall thickness and pipeline, applied in rolling mill control devices, length measuring devices, instruments, etc., can solve the problem of not giving wall thickness deviation, and achieve the effect of improving product quality

Inactive Publication Date: 2017-09-15
SMS MEER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This residue is symmetric and acts as an additional wall thickness deviation, but this wall thickness deviation does not actually give

Method used

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  • Method and computer program for analyzing wall thickness distribution of pipes
  • Method and computer program for analyzing wall thickness distribution of pipes
  • Method and computer program for analyzing wall thickness distribution of pipes

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Embodiment Construction

[0023] The method according to the invention is described in detail below on the basis of the accompanying drawings in the form of an embodiment

[0024] The method according to the invention for analyzing the wall thickness distribution of a pipe 10 comprises the following steps:

[0025] In a first step, the profile of the deviation of the wall thickness of the pipe in the tangential direction Φ is determined from a predetermined nominal thickness profile. exist figure 1 This actual distribution of the deviations in the wall thickness is denoted by reference numeral 1 . The curve with reference number 1 relates to the nominal wall thickness distribution in figure 1 not drawn in; its in figure 1 Corresponds to a circle with a constant radius about the midpoint, where the radius of the circle does not differ from that of the pipe in figure 1 The constant radius for outer contour 2 is shown in .

[0026] According to the method according to the invention, the determine...

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Abstract

The invention relates to a method for analyzing the wall thickness distribution of a pipe. The method comprises the steps of: determining the distribution of deviations of the wall thickness in the tangential direction (Φ) of the pipe (10) from the nominal wall thickness distribution; A predetermined distribution approximates the determined distribution of wall thickness deviations. In order to improve the detection of defects in the case of erroneous wall thickness distributions, the method according to the invention provides that predetermined distributions of wall thickness deviations respectively represent different possible real defect types during the manufacture of the pipe (10); and at least one of the predetermined distributions Represents defect types that occur only in the circumferential region <180°.

Description

technical field [0001] The invention relates to a method for analyzing the wall thickness distribution of pipes, especially seamlessly produced pipes. Furthermore, the invention relates to a computer program product with a computer program for carrying out this method. Background technique [0002] Methods for analyzing the wall thickness distribution of pipes by applying Fourier analysis to a defined wall thickness distribution are known in the prior art, see for example European patent documents EP 1611969B1 or EP 1889670B1. In the method disclosed there, the individual components of the Fourier analysis are respectively assigned to sinusoidal functions of different frequencies; however, it generally lacks a direct link to actual possible defects in the production of the pipe. The interpretation or analysis of the results of the Fourier analysis concerning specific defects in the manufacture of the pipe is therefore often difficult to handle and provides only insufficient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B38/04
CPCB21B38/04B21B23/00G01B21/08B21B37/78
Inventor H.J.佩勒
Owner SMS MEER
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