PSI - Issue 40

Aleksey Antimonov et al. / Procedia Structural Integrity 40 (2022) 17–26 Aleksey Antimonov, Nadezhda Pushkareva / Structural Integrity Procedia 00 (2019) 000 – 000

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In order to implement the continuous breaking process, we propose a design in which the bending of the end is carried out by the groove disc rotation (Fig. 11) by Antimonov et al. (1985). The disc is installed with offset  relative to the rolling axis. When the rotating disk is in position 1, there is a capture of the rolled end by a groove with its subsequent bending and moving on a circle of radius r . In disk positions 2 and 3, the rolled end is deformed with minimum  min and maximum  max amplitudes. The disadvantage of the design is loading by asymmetric cycle, which is less dangerous than a symmetric cycle. 8. Practical application of the results The results obtained were used for breaking of pointed ends during in-line production of thick-walled fuel line pipes by coil drawing according to Antimonov and Bersenev (2009), Antimonov and Pushkareva (2018), Antimonov and Pushkareva (2019). For this purpose, designing, manufacturing and testing of various designs devices have been carried out by Poljanskij, Antimonov and Sokolovskij (1986). During the drawing process, the pipe end has to be sharpened in order to insert it into the die with subsequent capture by a pulling device. With multi-pass drawing on a self-aligning mandrel, at each passage the pipe end has to be cut off for the introduction of lubricant and a mandrel, and then sharpened again. In this case, it is necessary to ensure appropriate pipe cross section geometry. As it has been noted before, using bladed and abrasive tools for cutting pipes has several disadvantages. That’s why it is reasonable to use a chipping to remove the pointed end. The scheme of the mechanism for breaking pipe ends from a coil is shown in Fig. 12.

Figure 12. Scheme of a mechanism for breaking pipe ends from a coil.

Coil 1 is located on the unwinding table with fixation by rollers 2. The pipe is pulled out from the coil by driving rollers 3, 4, and is straightened by bending under the pressure of roller 5 that is installed on cylinder rod 6 and is passed through hole 7 for notch tool with stop on the end face of the rotating disk 8. The pipe movement is stopped due to slipping in rollers. When coinciding with the disc groove, the pipe is moved to the bottom of the groove, deformed by a circular bend and broken. If necessary, the breaking process can be repeated continuously without interruption.