TEST AND ANALYSIS ON SURFACE ROUGHNESS AND MICRO-PROFILE OF COLD-ROLLED STEEL SHEET

There are three kinds of cold-rolled steel sheet with different surface, as they were rolled by three types of cold-rolls whose surface were textured respectively by shot blasting, electro-discharge and laser. Using GBS-60 cupping test press to stamp the above-mentioned steel sheets, and the surface roughness and micro-profile of sheets before and after stamping were surveyed by SEM. Make a comparison between the surface roughness and micro-profile before and after deformation show that SEM image are in good accordance with measured roughness, and the distribution of roughness can be observed directly. The plastic deformation of the sheets can be analyzed by SEM images.