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Bending failure strain measurement method

A strain measurement and bending technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of difficult parts formability, not considering deformation history, etc.

Pending Publication Date: 2021-12-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The minimum relative bending radius index stipulated in the existing standards does not consider the deformation history and non-standardization of part features, so it is difficult to effectively evaluate the formability of actual parts, and can only be used as an evaluation of the bending performance of the material itself

Method used

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Embodiment Construction

[0047] In the following, a method for measuring bending failure strain of the present invention will be further described in detail according to the accompanying drawings and specific implementation methods.

[0048] Such as figure 1 , 2 A bending failure strain measurement method shown in ,

[0049] Through the image processing system based on the CCD camera, the bending failure strain corresponding to different bending radii is found, which specifically includes the following steps:

[0050] S1: Take a rectangular steel plate as the object to be tested, set the width direction of the steel plate as the Y direction, set the length direction of the steel plate as the X direction, and take each point on the center line of the steel plate length direction as the center, along the X direction, according to the design Set the value to carry out the colored calibration of the neighborhood radius of each X axis, determine the straight line where the calibrated radius is located as...

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Abstract

A bending failure strain measurement method is used for finding out bending failure strains corresponding to different bending radiuses through using an arranged image processing system based on a CCD camera. According to the bending failure strain measurement method, on the basis of an original test system, the image processing system based on the CCD camera is additionally arranged, and bending failure strains corresponding to different bending male die radiuses are found out through cooperation of the image processing system and the original test system, thereby establishing a corresponding data set of radius-bending failure strain, and forming an index for predicting the formability of the bending deformation of a part.

Description

technical field [0001] The invention belongs to the technical field of sheet metal forming, and in particular relates to a method for measuring bending failure strain. Background technique [0002] Bending deformation commonly exists in sheet metal parts, including stamping parts and bending parts such as automobiles and home appliances. In the process of part design or material selection, unreasonable feature definition or improper material selection will lead to unnecessary bending during the forming process Cracking, especially with the urgent need for lightweight and the pursuit of the ultimate product shape, advanced high-strength steel with relatively poor formability is included in the material selection system, and the evaluation or prediction of the bending formability of materials or parts is more important. [0003] At present, there are two standards for evaluating the bending formability of metal sheets, which are the series of standards GB / T15825.5-2008 "Metal ...

Claims

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Application Information

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IPC IPC(8): G01B11/255
CPCG01B11/255
Inventor 牛超陈新平
Owner BAOSHAN IRON & STEEL CO LTD
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