Method for analyzing micron-sized stamping bright spot defects of hot-dip galvanized automobile sheet

A technology of bright spot defect and analysis method, applied in the direction of analyzing materials, using wave/particle radiation for material analysis, measuring devices, etc., can solve the problem of stamping bright spot such defects that cannot be analyzed, etc., to facilitate the cause of the defect, easy to determine, design Scientifically rigorous results

Pending Publication Date: 2020-12-29
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent is also applicable to defects that are visible to the naked eye or can be detected by a surface inspection instrument, and cannot be analyzed for micron-sized hot-dip galvanized automotive sheet stamping highlights.

Method used

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  • Method for analyzing micron-sized stamping bright spot defects of hot-dip galvanized automobile sheet
  • Method for analyzing micron-sized stamping bright spot defects of hot-dip galvanized automobile sheet
  • Method for analyzing micron-sized stamping bright spot defects of hot-dip galvanized automobile sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Example 1 The hot-dip galvanized steel sheet in this example is HC180YD+Z, 0.7mm thick. The method for analyzing the stamping highlight defects of the micron-level hot-dip galvanized automobile sheet in this example includes the steps:

[0034](1) Simulated stamping

[0035]After simulated punching of the hot-dip galvanized steel sheet, it is cut into a punching sample of 1000mm×1000mm by a shearing machine.

[0036]The stamping highlight defect of micron-level hot-dip galvanized automobile sheet is a very concealed coating defect, which can not be found by naked eyes or a meter in the production stage, and usually occurs in the stamping process of automobile manufacturers. Therefore, in this embodiment, the hot-dip galvanized steel sheet is subjected to simulated stamping to make the stamping highlight defects appear.

[0037](2) Surface polishing

[0038]Place the stamped sample 2 on the observation table, which is composed of a stage and a fluorescent lamp with a lampshade, and then polis...

Embodiment 2

[0044]Embodiment 2 The hot-dip galvanized steel sheet of this embodiment is DC53D+Z, 0.8mm thick, and the method for analyzing the stamping highlight defects of the micron-level hot-dip galvanized automobile sheet of this embodiment includes the steps:

[0045](1) Simulated stamping

[0046]After simulated punching of the hot-dip galvanized steel sheet, it is cut into a punching sample of 1000mm×1000mm by a shearing machine.

[0047](2) Surface polishing

[0048]Place the stamped sample on the observation table, which is composed of a stage and a fluorescent lamp with a lampshade, and then polish the zinc layer on the surface of the stamped sample plate with a 1000-mesh oilstone.figure 1 As shown, keep the grinding direction at an angle of 30° with the rolling direction of the sample, and apply uniform pressure for unidirectional grinding. After the polishing is completed, press the sample plate surface and observe with the naked eye whether there are any bright spots under the illumination of ...

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Abstract

The invention relates to the field of steel and iron material surface quality analysis methods, in particular to a method for analyzing micron-sized stamping bright spot defects of a hot-dip galvanized automobile sheet. According to the method, a stamping sample is obtained through simulated stamping, then the stamping sample is polished by an oilstone to enable the micron-sized stamping bright spot defects to appear, then electron microscope scanning and energy spectrum analysis are carried out after dezincification treatment is carried out on a stamping bright spot defect area, and finally the forming reasons of the stamping bright spot defects is determined. The method is scientific and rigorous in design, stamping bright spot defects and the forming reasons of the stamping bright spotdefects can be accurately found out, and an important basis is provided for production improvement of the hot-dip galvanized automobile sheet.

Description

Technical field[0001]The invention relates to the field of surface quality analysis methods for iron and steel materials, in particular to a micron-level hot-dip galvanized automobile sheet stamping highlight defect analysis method.Background technique[0002]Hot-dip galvanized steel sheets with high surface quality and excellent stamping properties have always occupied a large proportion of automotive steels, and are used to stamp surface covering parts such as fenders, side wall outer panels, door outer panels and engine hoods. The surface quality of hot-dip galvanized steel sheet is related to the quality of the stamping and coating process of automobile manufacturers. As domestic automobiles move toward high-end, automobile manufacturers have put forward higher and higher requirements for the surface quality of hot-dip galvanized steel sheets. Therefore, the galvanizing production line of steel enterprises must also improve the quality control level. The common defects that affect...

Claims

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Application Information

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IPC IPC(8): G01N23/2251G01N23/2206G01N23/2202G01N23/203
CPCG01N23/2251G01N23/2206G01N23/2202G01N23/203
Inventor 陈一鸣孙伟华胡宽辉王俊霖祝洪川
Owner 武汉钢铁有限公司
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