An Experimental Study of Flexible Skew Rolling Bar Process

When manufacturing bars with multi-specification and small-batch production, the traditional longitudinal bar rolling process brings a high tooling cost due to the complex and long process production line. In previous studies, authors have proposed a flexible skew rolling (FSR) process. This process has the advantages of universal mold, low production cost and suitable for small batch parts production. The author successfully rolled different shapes of shafts by this process. In this study, the flexible skew rolling process was used to produce bar, and a physical investigation corresponding was undertaken with a \(\varnothing \) 60 LZ50 steel billet. It can be concluded that, the main defects of FSR formed bar mainly have the defects of concavity and surface spiral marks. The depth of concavity is reduced by 27.56 mm when using 40° cone angle billet, and the height of surface threads is reduced by 0.26 mm when using 15° unloading circular chamfer.