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Strip steel sample for forming limit test, and limit test method

A technology of forming limit and test method, applied in the direction of applying stable tension/compression to test material strength, measuring devices, instruments, etc., can solve the problems of detection failure, low success rate, manpower consumption, material cost, etc.

Pending Publication Date: 2021-09-10
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Currently, when testing the forming limit performance of the sample, it often occurs that the above-mentioned cracking position in a) occurs near the die orifice, that is, it appears at the edge of the convex hull (marked by the black ellipse), such as figure 1 As shown, it will lead to the failure of the detection. Therefore, in the forming limit detection of strip steel, three samples should be prepared each time. If the first sample fails to be detected, the other two spare samples should be used.
After a period of time of forming limit test success data statistics, at present, the success rate of sample detection is about 67%, the success rate is low, resulting in re-sampling test, consuming manpower and material costs, and the forming limit test quotation of colleges and universities is 3 -40,000 yuan / set

Method used

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  • Strip steel sample for forming limit test, and limit test method
  • Strip steel sample for forming limit test, and limit test method
  • Strip steel sample for forming limit test, and limit test method

Examples

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Embodiment 1

[0069] Embodiment 1 provides a kind of strip steel and limit test method for forming limit test, the thickness of the strip steel carrying out limit test is 1.6mm, and tensile strength is 832MPa, specifically as follows:

[0070] 1. Prepare samples for the above-mentioned strip steel. The number of samples prepared is 3 sets, with 9 samples in each set, 27 in total. The width of the deformation zone in each set of samples is 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm and 180mm, 3 samples of each deformation zone width, the numbers of these 3 samples are the same, and the numbers are 1#, 2#...9#.

[0071] Among them, the shape of 1-4# sample is as follows figure 2 As shown, each sample includes a central deformation zone 1, a first deformation zone 2, a second deformation zone 3, and a blank-holding zone 4. Each sample is symmetrical about the center line of the rolling direction. The specific dimensions of each zone are shown in the table 1. The shape of 5-9# sample...

Embodiment 2

[0079] Embodiment 2 provides a kind of strip steel and limit test method for forming limit test, the thickness of the strip steel carrying out limit test is 1.2mm, and tensile strength is 1200MPa, specifically as follows:

[0080] 1. Prepare samples for the above-mentioned strip steel. The number of samples prepared is 3 sets, with 9 samples in each set, 27 in total. The width of the central deformation zone in each set of samples is 20mm, 40mm, 60mm, 80mm, 100mm respectively , 120mm, 140mm, 160mm and 180mm, the 3 samples of the width of each deformation zone have the same numbering, and the numbers are 1#, 2#...9# respectively.

[0081] Among them, the shape of 1-4# sample is as follows figure 2 As shown, each sample includes a central deformation zone 1, a first deformation zone 2, a second deformation zone 3, and a blank-holding zone 4. Each sample is symmetrical about the center line of the rolling direction. The specific dimensions of each zone are shown in the table 1....

Embodiment 3

[0089] Embodiment 3 provides a kind of strip steel and limit test method for forming limit test, the thickness of the strip steel carrying out limit test is 1.5mm, and tensile strength is 780MPa, specifically as follows:

[0090] 1. Prepare samples for the above-mentioned strip steel. The number of samples prepared is 3 sets, with 9 samples in each set, 27 in total. The width of the central deformation zone in each set of samples is 20mm, 40mm, 60mm, 80mm, 100mm respectively , 120mm, 140mm, 160mm and 180mm, 3 samples of the width of each central deformation zone, the numbers of these 3 samples are the same, and the numbers are 1#, 2#...9#.

[0091] Among them, the shape of 1-4# sample is as follows figure 2 As shown, each sample includes a central deformation zone 1, a first deformation zone 2, a second deformation zone 3, and a blank-holding zone 4. Each sample is symmetrical about the center line of the rolling direction. The specific dimensions of each zone are shown in th...

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Abstract

The invention provides a strip steel sample for a forming limit test, and a forming test method. The length direction of the sample is the rolling direction, the sample comprises a center deformation area, two first deformation areas, two second deformation areas and two edge pressing areas, and the width of the center deformation area is smaller than or equal to 80 mm; and the width of each first deformation area is larger than that of the central deformation area, so that two sides of the sample are respectively provided with a step, and the width of each second deformation area is larger than that of each first deformation area, so that two sides of the sample are respectively provided with another step. By adopting the method provided by the invention, the success rate of a forming limit test is greater than or equal to 91.67% and is far higher than the success rate 67% of the forming limit test of a sample prepared according to the standards of GBT15825.8-2008 and GB / T 24171.2-2009.

Description

technical field [0001] The invention belongs to the technical field of metal material performance detection in the metallurgical industry, and in particular relates to a strip steel sample for a forming limit test and a limit test method. Background technique [0002] The strip steel has certain plasticity and can withstand a certain degree of deformation. For the good or bad plasticity, the forming limit curve of the strip steel can be obtained through the forming limit test, so as to judge the formability of the strip steel. This is to judge and evaluate the strip steel forming The most concise and intuitive method. [0003] According to the national standard GBT15825.8-2008 Sheet Metal Formability and Test Method Part 8: Forming Limit Diagram (FLD) Determination Guide: "The test is invalid in any of the following situations: a) necking or cracking of the sample occurs Near the orifice of the die; b) When samples of different widths are used, the side of the sample is tor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0067G01N2203/0647G01N2203/0676
Inventor 王伟陈洪生韩龙帅刘岳
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD