Development of integrated stub end by spinning process

The stub end is used to connect pipes in piping arrangement. Generally the components are manufactured by welding two subcomponents. But this method requires a large amount of time and money and also has a problem due to welding process like thermal deformation or embrittlement at heat affected zone. The spinning process, eco-friendly incremental process, was adopted to develop stub end without weld. It allows the component to be produced by non-welding with low cost and short process time. The major goal of this study is to develop optimum spinning process for manufacturing integrated stub end in keeping with the dimensions presented in the code. The suitable multi-step spinning process and rollers which can set required shapes and dimensions at each location of the component were designed by simulation. Base on the result of analysis and test, the 4 inch’s stub end specified in the code was developed. The spinning machine was also developed to manufacture specimens. Hardness was measured to predict the strength of flange part. Along with the shapes, all dimensions at each part were satisfied the required values.