DESIGN OF SPM WITH ROLL TOOL FOR MUDGUARD HEMMING

Abstract

Hemming is a forming operation in which the edges of the sheet are folded or folded over another
part in order to achieve a tight fit. This paper deals with the design of special purpose machine for hemming
operation in mudguard. Present hemming process of mudguard by press forming are analyzed, tool improvement
are made based on the results. Press forming operation has severe impact on cycle time, quality and aesthetics of
the mudguard like wrinkling, line marking.
The objective is to design a special purpose machine for hemming operation in mudguard to improve productivity
and quality. Roll forming tool is designed for hemming the edges of mudguard. In this process, the edges of
mudguard are bent steadily as it passes between a set of rolling tools. This steady bending of rolling tool
eliminates the stepping in press forming, which in turn reduces the cycle time. Gradual loading allows roll
forming tool to take greater control over spring back, which in turn improves the quality and aesthetics of the
mudguard. Special purpose machine is designed for developed tool by using CAD package