Wide-die/Non-overlap Bending Technique for JCO Forming Process

Elaborated here in the essay is a wide-die/non-overlap technique for JCO forming that is free of prebending and expanding,The said technique has brought about the formation of the LSAW pipe without subjecting to the overlap bending operation step owing to adopting the wide-die and the large stride length as well.The analysis result leads to such a conclusion that both sufficient bending force and the radius R of the upper die that meets the design requirement for the curvature of the cylindrical blank tube act as the two critical preconditions for pipe formation with the wide-die/non-overlap bending process.Quality of blank tube formation and the manufacture efficiency shall be improved by means of such measures as using die with the upper part’s radius R meeting the design requirement for the cylindrical blank tube,and adjusting the opening distance of the lower die,and the screwdown amount of the upper die so as to obtain the purpose of wide-die/non-overlap bending.