Abstract
In this paper, cold plastic forming of ABS plastic pipe was operated for the purposes of improving productivity and lowering manufacturing cost. The parts of ABS plastic pipe is generally produced by injection molding of hot working. The processes need the cooling time, and it takes much time. In addition, expensive mold die is needed for each application. Thus, cold plastic forming of ABS plastic pipe was proposed. Product ability of cold plastic forming is higher than the injection molding or hot working. And the punch and die shape is simple comparing to these process. In this study, pipe expansion process at room temperature was operated. The ABS plastic pipe has a 10 mm diameter and 1 mm thickness. At first, true stress and true strain curves at any strain rate were measured by ring compression test. Obtained flow stresses was used to FEM analysis. Experimental device for pipe expansion process was made by Dip Inc.. Objective inner diameter was 10 mm. FEM analysis was operated to clarify the deformation behavior such as load-stroke diagram. It was possible to produce the expanded ABS pipe. The whitening of worked pipe was observed. Analysis result was indicated the good agreement comparing to experimental result in load-stroke diagram. Heat treatment was effective for reduction of whitening.
