Method for rapidly detecting surface formation defect of thin sheet

Abstract

The invention relates to a method for rapidly detecting the surface formation defect of a thin sheet, belonging to the technical field of steel plate surface detection. The detection steps comprises the following steps: processing the thin sheet to be measured to sheet-like samples with a thickness identical to the shin sheet and a size meeting the requirement for a bulging test; cleaning the surface of the samples and drying; carrying out a rigid convex die bulging test to detect the surface formation defect, wherein different surface formation defects can be detected according to the different bulging depths because different bulging depths result in different deformation amount and different strain state of the thin sheet. The method has the advantages that the method not only can detect the surface formation defects of common cold plate, such as slip line, surface roughening and impurities, but also can detect the formation defects of Zn-plated plate, such as scaling and powderingof the surface Zn layer. In addition, the method is simple, and has high speed and high accuracy.

Description

technical field [0001] The invention belongs to the technical field of steel plate surface inspection, and in particular provides a method for detecting surface forming defects of automobile sheets and home appliance sheets, which can quickly detect defects that may occur in thin sheets such as automobile sheets, home appliance sheets, and building sheets during deformation, such as Surface forming defects such as slip lines, orange peel, inclusions, zinc layer defects, etc. Background technique [0002] Thin steel plates are mainly steel plates below 3mm. Thin plates mainly include automotive plates, home appliance plates, and construction plates. Before leaving the factory, thin plate products must undergo surface inspection, mechanical properties, and roughness measurements. The surface quality and basic mechanical properties of the front surface, while the sheet will have surface defects such as slip lines, orange peel, inclusions, and zinc layer peeling during use that ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for quickly detecting surface forming defects of thin plates such as automobile panels, home appliance panels, and building panels. The bulging test is added to the inspection items before leaving the factory, so as to overcome the surface forming defects of thin plates before leaving the factory. The shortcomings found, the bulging test can not only detect surface forming defects such as slip lines, orange peels, and inclusions on ordinary cold plates, but also detect forming defects such as inclusions on the surface of galvanized sheets, zinc layer peeling off, etc., and the measurement speed is fast and accurate High, greatly improving the qualified rate of products leaving the factory

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