Abstract
The purpose of the study is to form $\Omega$-type bellows without any defect by specific rollers which are designed based on the volume distribution technique. In the present paper, we proposed a forming process of existing U-type bellows to a value-added $\Omega$-type in a progressive manner. It was developed to shape a perfect $\Omega$-type bellows after preforming from initial U-type bellows to final U-type bellows. To examine the suggested 'processing condition design' some experiments were performed in a real scale. It was found out that the spring back effect played a major role in deviating the geometry of formed bellows from the predicted one. The problems found in the experiment can be used as important information in manufacturing equipment for forming $\Omega$-type bellows.
