Characteristics of Wall Thickness Increase in Pipe Reduction Process Using Planetary Rolls

摘要

In recent years,global warming has become a worldwide problem.The reduction of carbon dioxide emissions is a top priority for many companies in the manufacturing industry.In the automobile industry as well,the reduction of carbon dioxide emissions is one of the most important issues.Technology to reduce the weight of automotive parts improves the fuel economy of automobiles,and is an important technology for reducing carbon dioxide.Also,even if this weight reduction technology is applied to electric automobiles rather than gasoline automobiles,reducing energy consumption remains an important issue.Plastic processing of hollow pipes is one important technology for realizing the weight reduction of automotive parts.Ohashi et al.[1-2] present an example of research on pipe formation in which a process was carried out to enlarge a pipe diameter using a lost core,achieving the suppression of wall thickness reduction and greater pipe expansion than hydroforming.