A Review Paper on Product Surface Defect Detection of Ironing Process

Abstract

The quality of product of manufacturing industries depends on dimension accurately and surface roughness quality. There are many types of surface defects and levels of surface roughness quality. Ironing process is one type of metal forming process, which aims to reduce the wall thickness of the cup-shaped or pipes products, thus increasing the height of the wall. Manually surface inspection procedures are very inadequate to ensure the surface in guaranteed quality. To ensure strict requirements of customers, the surface defect inspection based on image processing techniques has been found to be very effective and popular over the last two decades. The paper has been reviewed some papers based on image processing for defect detection. It has been tried to find some alternatives of useful methods for product surface defect detection of ironing process.

Formability of Polymer-coated Metals

“…Due to the aforementioned fine tolerances required in DWI, any sediment or contamination on the tooling can create various defects: such as trapped particulate propagating a silhouette during drawing (colloquially known as worm Trails). This kind of defect occurs as a result of the metal blank being ironed between surfaces which are no longer smooth, due to a trapped contaminant [20]. An unclean blank or residual contaminants can also prevent full adhesion between the fully formed metal can and the protective non-reaction layer of lacquer which is sprayed on during the final post-processing steps.…”

“…20 represents the changing Equivalent plastic strain experienced by 1 element at the tip of the trailing edge, on the side meeting the ironing ring. Figure3.20 clearly demonstrates similar plastic strain, until the final ironing stage where the advanced punch geometry shows significantly reduced plastic strain.…”