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Method and apparatus for measuring eccentricity of hollow tube blank

A hollow tube, eccentricity technology, applied in this entrance field, can solve the problem of difficult to replenish equipment and so on

Inactive Publication Date: 2004-01-28
SMS MEER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some disadvantages due to the cycle time and due to the costs associated with it
In addition, it is also considered to be insufficient: this kind of equipment system may be difficult to supplement and equip on the existing rolling production line

Method used

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  • Method and apparatus for measuring eccentricity of hollow tube blank
  • Method and apparatus for measuring eccentricity of hollow tube blank
  • Method and apparatus for measuring eccentricity of hollow tube blank

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0027] First you can start from figure 2 See how the measurement of the wall thickness s of the tube blank 1 can be realized.

[0028] The laser-ultrasonic wall thickness measurement method is used, which conforms to the typical principle of ultrasonic transit time measurement. When the sound wave velocity in the tube blank material is known as C, the required wall thickness s can be obtained from the time for the ultrasonic pulse to pass through the wall of the tube blank 1 for the second time. For high-temperature wall thickness measurements at temperatures around 1000 °C, the coupling of ultrasonic waves, both on the excitation side and on the detection side, requires a non-contact optical method, in which the measuring head (2' in Fig. 1) itself can be connected to the tube. The blank 1 is kept at a distance that is reliable from the temperature point of view.

[0029] High-energy light pulses in the infrared range are absorbed on the surface of the tube blank 1 . They ...

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PUM

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Abstract

The change of the eccentricity e of a hollow block 1 is approximately determined as the change of a wall thickness s being as the function of a vertical coordinate z extending to the direction of the vertical axis L of the hollow block and a rotation angle [phi] around the vertical coordinates in accordance with a formula s ([phi], z)= s0(z)+s1(z)cos([phi]+[delta](z)). Given times of measurements for wall thickness are performed when a measurement device passes the hollow block to provide the measured value to a calculation method. The measured values are Fourier-transformed by the calculation method in order to determine approximations as the vertical coordinate z and rotation angle [phi] due to the functional change of the wall thickness s. The invention relates to the device for particularly practicing the method.

Description

technical field [0001] The invention relates to a method for determining the eccentricity of a hollow billet, preferably at the entrance of a rolling mill following a skew rolling mill, in particular at the entrance of a continuous rolling mill or a seamless tube jacking machine At the position, the hollow tube blank enters the entrance in the direction of its longitudinal axis, and the measurement is by means of at least one measuring device capable of measuring the wall thickness of the tube blank at a longitudinal position and a circumferential position of the tube blank. The invention also relates to a device for measuring the eccentricity of the hollow shell blank. Background technique [0002] Steel tubes are required in many technical fields and they can be produced, for example, by a method in which a cylindrical blank is processed into a hollow tube in a cross-rolling mill using an axially fixed piercing mandrel. To roll a cylindrical billet into a seamless tube, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02B21B19/04B21B37/78B21B38/04B21C51/00G01B21/00
CPCB21B2261/08B21B19/04B21B38/04B21B37/78
Inventor M·绍尔兰德K·H·霍伊斯勒
Owner SMS MEER