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Method for measuring metal pipes thick anisotropy index

A metal pipe and thickness anisotropy technology, which is applied in the field of measuring the thickness anisotropy index of metal pipes to achieve accurate evaluation and accurate measurement results.

Inactive Publication Date: 2007-09-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to a certain amount of plastic processing from the plate to the pipe, various properties have certain changes, and the thickness anisotropy index is no exception. Therefore, there is a certain deviation in the performance of the plate instead of the performance of the pipe.

Method used

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  • Method for measuring metal pipes thick anisotropy index

Examples

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Effect test

example 1

[0022] Example 1: Detection of thickness anisotropy index of 20# steel pipe

[0023] 1. Sampling according to GB / T 228-2002 tensile standard for pipes with stoppers.

[0024] 2. Measure the wall thickness t of the pipe to be 3mm, the outer diameter D to be 32mm, and the inner diameter d to be 26mm.

[0025] 3. The safety standard stipulates that the tensile test should be carried out on a 100KN vertical hydraulic tensile testing machine.

[0026] 4. When the sample is stretched to the engineering strain level of 10-15%, measure the outer diameter D of the sample 1 For: 30.4mm.

[0027] 5. According to the model 1 4 π ( D 2 - d 2 ) tL = 1 4 π ( D 1 2 ...

example 2

[0030] Example 2: Detection of thickness anisotropy index of 304 stainless steel pipe

[0031] 1. Sampling according to GB / T 228-2002 tensile standard for pipes with stoppers.

[0032] 2. Measure the wall thickness t of the pipe to be 5mm, the outer diameter D to be 40mm, and the inner diameter d to be 30mm.

[0033] 3. The safety standard stipulates that the tensile test should be carried out on a 100KN vertical hydraulic tensile testing machine.

[0034] 4. When the sample is stretched to the engineering strain level of 10-15%, measure the outer diameter D of the sample 1 For: 38.4mm.

[0035] 5. According to the model 1 4 π ( D 2 - d 2 ) tL = 1 4 π ( D 1 ...

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Abstract

This invention provides one method to test metal tube thickness abnormal index in the metal shaping and process technique field, which comprises the following steps: metal tube materials are under impact of single axis to stretch the test specimen into deformation phase to achieve set work stress level; measuring the standard length and tube outer radium change and using plastic deformation constant volume principle and deformation theory thickness change module to compute tube deformation thickness value to determine metal tube thickness abnormal index r value.

Description

Technical field: [0001] The invention belongs to the technical field of metal plastic forming processing, and is used for main performance detection during plastic forming processing of metal pipes, in particular to a method for measuring the thickness anisotropy index of metal pipes. Background technique: [0002] With the development of the automobile industry, lightweight automobile design requires automobile parts and structural parts with lighter weight, better performance and stronger overall performance. Due to the advantages mentioned above, hydraulic bulging technology has received more and more attention. Hydraulic bulging technology is a new technology. In hydroforming, the performance of metal pipes has a great influence on its forming performance, and the thickness anisotropy index of metal pipes, namely r value, is an important index. [0003] The r value of the thickness anisotropy index is usually expressed by the ratio of the strain in the width direction t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N3/28
Inventor 钱健清李胜祗侯军明
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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