![]() ![]() In: Abstracts 1st international conference on Rotary Metalworking Processes pp. Noble CF, Sarantidis TM (1979) A study of cold roll forming. Taylor & Francis, LondonĪngel RT (1949) Designing tools for cold roll forming. Halmos GT (ed) (2006) Roll forming handbook. This trend is in agreement with previous experimental observations, suggesting that the analytical model proposed may be applied for early process design and optimisation before time-consuming numerical analysis is performed. It shows that the lowest level of shape defect in the part is achieved when the trajectory of the strip edge follows the shortest line length between the start and finish of forming, leading to the least longitudinal strain introduced in the flange. The concept is applied to several cases available in the literature. The model is purely geometric, as is the original flower pattern approach, and does not include the effect of material behaviour. This new diagram, which apparently has not been used previously, provides a useful initial method of examining the roll forming process and optimising the flower pattern. ![]() It is shown that at any stage in the process, the axial strain and the curvature of the sheet adjacent to the point are dependent on the slope of the trajectory in this plane projection. This surface is unwrapped to give its plane development and important features of the forming process can be determined and are readily interpreted from this plane curve. The forming path is a surface curve that lies on a cylindrical surface having its axis along the machine axis. To demonstrate the method, the forming path or trajectory of a point at the edge of the strip during forming a V-section is considered. In the present work, the flower pattern is extended into three dimensions. In this diagram, the cross sections of the strip at each roll stand are superimposed on a single plane the diagram is a 2D representation of the 3D process. The initial process design of a roll forming system is often based on the traditional ‘flower pattern diagram’. ![]()
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