Maximum Reduction in Power Spinning of Tubes

Abstract

An experimental technique is described for determining the maximum reduction in forward tube spinning as a function of the process variables. Results have indicated that for materials with tensile reduction of area above 45 percent a maximum spinning reduction of about 80 percent in one pass is the limit. Of all the process variables considered, only the feed had any appreciable influence on spinnability. In comparing maximum reduction with tensile reduction of area complete similarity was observed between shear (cone) and tube spinnability of metals. An approximate analysis is made to determine maximum reduction in tube spinning as a function of process variables and material properties. A brief discussion is presented on coefficient of friction in metal-forming processes.