Method for fast indentifying linear defect of automobile panel

A linear defect, automotive technology, applied in the field of automotive panel quality inspection, can solve problems such as inability to identify linear defects, inability to capture characteristic signals, and disordered detection signals, achieving significant economic and social benefits, and promising application prospects. Extremely popular effect

Active Publication Date: 2014-07-30
武汉钢铁有限公司
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Problems solved by technology

If a spark spectrometer is used to analyze linear defects under conventional conditions (spark bar discharge parts for analyzing the content of steel elements), the discharge in an unsteady state, such as figure 1 As shown, the gray area in the spot sh

Method used

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  • Method for fast indentifying linear defect of automobile panel
  • Method for fast indentifying linear defect of automobile panel
  • Method for fast indentifying linear defect of automobile panel

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Embodiment

[0037] A method for quickly identifying linear defects in automotive panels, comprising the following steps:

[0038] 1) Sample treatment: Use silicon carbide sandpaper to polish the defective part of the defective sample, remove the surface zinc layer, and expose the iron base;

[0039] 2) Sample analysis: Analyze the sample on a spark spectrometer with single spark detection function, the analysis conditions are analysis gap 3mm, argon flushing time 3s, pre-discharge times 400 times, measurement 2000 times, spark pulse peak current 200A, normal area Stimulate 3 times, and stimulate at least 1 time for the defect in the abnormal area, and export the data after the analysis is completed;

[0040] A stable discharge can be formed under the analysis conditions of the present invention, such as figure 2 As shown, the bright discharge area around the molten residue shows no difference in the appearance of the discharge from the defect-free area, and the phenomenon of iron-based ...

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Abstract

The invention discloses a method for fast indentifying the linear defect of an automobile panel. The method comprises the following steps: 1) removing zinc layer on the surface of defective part of a defective sample to expose iron base by silicon carbide sandpaper; 2) analyzing the sample by analysis conditions set on a spark spectrometer, and exporting data after analyzing; and 3) according to the exported data, if the difference between the measured value of the element of the defective part and the measured value of a normal area is greater than 3 sigma, then indentifying that the defect belongs to inclusion defect, whereas the defect is scratch defect. The method disclosed by the invention can motivate the elements in the linear defect, can distinguish aluminum, calcium and other elements contained in the defect from the aluminum and the calcium in normal iron base by establishing a distinguishing rule, and can quickly identify the inclusion defect and the scratch defect of the linear defects of the automobile panel. The method has short sample analyzing time so as to solve problem of the backlog of the samples to be tested in a scene, and does not affect smoothly running production; and moreover, the method is accurate, intuitive, and is out of qualitative fuzzy problem.

Description

technical field [0001] The invention relates to a method for detecting the quality of an automobile panel, in particular to a method for quickly identifying linear defects of an automobile panel. Background technique [0002] High-grade automotive steel has extremely high requirements on the surface quality of the panel. Some defects can be covered after the panel is painted, but some defects (such as linear defects) will affect the painting effect. Quality inspectors can directly identify and judge obvious defects, but some defects such as linear defects are not easy to distinguish accurately by naked eyes. Linear defects may come from non-metallic inclusions brought into the billet during steelmaking, or may be scratches caused by the rolling process. After the galvanizing process, it appears as a faint "white line", which is difficult to identify manually. [0003] After the discovery of such linear defects, the usual practice is to conduct energy spectrum analysis of th...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N21/66
Inventor 沈克张兆雄陶勇马广平郭芳黄双李小杰关菊梅贾丽晖赵在群
Owner 武汉钢铁有限公司
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