Defects in Drawing Process
Most of the defects in drawing process are similar to those observed in extrusion, specially centre cracking. The tendency of cracking increases with the increase in die angle. Another type of defect in drawing is the formation of seams, which are longitudinal scratches of folds in the material. |
Besides several advantages, these metal forming processes can also lead to undesirable defects in the processed parts. Defects can be avoided by proper design of the parts as well as by the appropriate selection of the process parameters. For example, depths of impression, draft allowance, minimum web thickness of the parts are some of the critical issues associated with typical forging operations. |
