Abstract
The technology of the shell case rolling into the rough pipe on an automatic mill of the pipe-rolling plant PRP 220 was considered. In case of the pipe rear end stability losing for a special thin-walled assortment of rolling products the theoretical research was carried out based on the FEM. As the result of the research the nature of such flaw as a “fin” on the end of the pipe was investigated, the evaluation of the loading on the automatic mill for the PRP 220 was obtained for different process parameters.
Highlights
In order to analyze the shape change of the pipe billet when rolling through an automatic mill, threedimensional modeling of the process was performed with a help of FEM software [4]
The performed theoretical study made it possible to observe a loss in the lateral stability of the end of the pipe when rolling, which begins with ovalization of the cross section of the billet, followed by the transition of metal into the roll gap and rolling of the metal into the “fin” (Figure 2)
The graph of axial forces is of a similar nature, which is accompanied by a characteristic peak at the moment of “wrinkling” at the end of the pipe (14.2-22.9% of the average values of axial force for various ratios of the outer diameter of the pipe to the wall thickness)
Summary
In order to analyze the shape change of the pipe billet when rolling through an automatic mill, threedimensional modeling of the process was performed with a help of FEM software [4]. Rolling of the pipes through an automatic mill with a ratio of the outer diameter to the wall thickness of more than twenty five is accompanied by the formation of a defect at the end of the pipe in the form of a longitudinal fold [3].
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