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Detecting method for cold rolled steel strip inner stress

A detection method and technology of strip steel shape, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of high cost, difficult operation, and high equipment requirements, and achieve the improvement of punching forming performance, simple operation method, and low equipment requirements. Effect

Inactive Publication Date: 2004-02-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Difficult to operate
According to the existing plate shape internal stress detection method in foreign standards, the sample requires 2m in length, and it needs to be straight when transported, so the operation is relatively difficult
[0005] 2. High equipment requirements
The existing detection method of plate shape internal stress in foreign standards requires a shearing machine with a shearing width greater than 2m, but there are few such shearing machines, and the cost of building alone is high. At the same time, a platform with a length of 2m and a corresponding width is required for measurement , to ensure the straightness of the sample and the validity of the measurement results
[0006] 3. It cannot truly reflect the internal stress of the plate shape
Due to the interference of other parts, the test result is only a comprehensive reflection of the internal stress of the plate shape inside the steel plate at the test site, and cannot reflect the internal stress of the plate shape at the actual measurement site

Method used

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  • Detecting method for cold rolled steel strip inner stress
  • Detecting method for cold rolled steel strip inner stress
  • Detecting method for cold rolled steel strip inner stress

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1: The object tested in this embodiment is a non-oriented cold-rolled silicon steel strip that has not been annealed. First cut a test sample with a length of 1000mm, and the width of the test sample is 1022mm. Align the two ends of the test sample on the shears to ensure the effective length of the test sample. Cut the sample slices according to the size of 30mm in the rolling direction, put them in order, then use the vernier caliper to measure the length of the sample slices, and use the coordinate curve to describe the length and dimension changes of the test sample slices (see figure 1 , the horizontal axis in the figure represents the width position corresponding to the detection sample slice, and the vertical axis represents the length dimension change of the sample slice), and finally according to Hooke’s law, that is, the formula σ=G·ε=G·Δl / L, at this time G =197×10 3 MPa, the change of the length dimension of the sample slice is converted into the ...

Embodiment 2

[0028] Example 2: The object tested in this example is a non-oriented cold-rolled silicon steel strip that has been annealed and coated. The length of the test sample is 1000mm, the width is 1022mm, and the length of the sample slice is 25mm. The length and dimension change curve of the test sample slice is as follows: image 3 As shown (the horizontal axis in the figure represents the width position corresponding to the test sample slice, and the vertical axis represents the length and dimension change of the sample slice), the test sample plate shape internal stress distribution curve is as follows Figure 4 (the horizontal axis in the figure represents the width position corresponding to the test sample slice, and the vertical axis represents the stress suffered by the sample slice).

[0029] From the test results of this example image 3 , Figure 4 It can be seen that there is a large internal stress in the shape of the cold-rolled sheet, and the maximum stress reaches ...

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Abstract

The method of detecting internal stress of cold rolled steel strip includes the following steps: cutting 500-1500 mm long detection sample in the stable rolled part of the steel strip; cutting two ends of the sample to ensure the effective length; cutting the sample into several sample pieces of specified size while maintaining the sample piece order; measuring the lengths of the sample pieces and describing the change of the sample pieces in coordinate curves; converting the length change of the sample pieces into the stress of the sample pieces based on Hooke's law; and drawing stress distribution curves in width of the rolled steel strip. The present invention can describe the internal stress distribution of steel strip and is significant in guiding the improvement of steel strip form.

Description

technical field [0001] The invention belongs to the technical field of quality control and detection of rolled steel, and in particular relates to a detection method for the shape internal stress of cold-rolled strip steel. Background technique [0002] In the case of large residual plate shape internal stress inside the material, different changes will be formed on the plate surface, such as middle wave, rib wave, edge wave, etc. The plate shape internal stress inside the material can be qualitatively known through plate shape changes, but most The internal stress of the plate shape inside the material is small and will not be reflected in the change of the plate shape. Certain detection methods are required to accurately understand the size and distribution of the plate shape internal stress inside the material. [0003] At present, in terms of the requirements and detection of the internal stress of the cold-rolled steel strip, there is no clear regulation in the national...

Claims

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Application Information

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IPC IPC(8): G01L1/00
Inventor 李慧峰王立新张兰王彩焕李银龙王丽霞
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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