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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7. Design of devices for rolled products breaking As noted before, the process of breaking by cyclic bending requires that the end of the rolled bars is given to circular motion. Such motion can be carried out by devices of various designs. The operation scheme of one of them is presented in Fig. 9. The device consists of disk 1 with hole 2. At the initial moment the disk is installed in position I , in which the axis of the hole is aligned with the axis of the rolling. Then, the disc is set in position II until the disc axis is aligned with the rolling axis in clamp 3 in Fig. 1. The disc starts spinning at frequency  . The end of the rolling performs circular motion with bending by a symmetrical cycle. The disadvantage of the design is the need to stop the disk in a certain position to align the rolling and hole axes, as well as periodic shifting the disk from one position to another while breaking each workpiece.

Figure 9. Disc with hole.

Figure 10. Disk with load.

Figure 10 shows a design that does not have these disadvantages according to Poljanskij et al. (1984). The device consists of disc 1. It carries load 2 with hole 3, lever system 4 with springs 5 and a counterweight 6. When the disc is not rotating, the hole and the rolling are always coaxial. The roll end can be freely inserted into the hole. The rolled end bending is carried out by radial load movement along the disk guides under the action of centrifugal force as the disk rotates. The installation of the counterweight reduces dynamic loads. The lever system is used to synchronize the load and counterweight movements, and the springs are used to return the load and counterweight to their original position once the disk stops rotating. The roll end also makes a circular movement with bending by a symmetrical cycle. The disadvantages of this design are the need to stop the disk at each workpiece breaking, and the determination of device parameters and its settings for breaking rolled products of different ranges.

Figure 11. Grooved disc.