ANALYSIS OF OPERATION OF THE CCM CRYSTALLIZER ROLLING MECHANISM WITH APPLICATION OF ELASTIC PNEUMATIC ELEMENTS IN JOINTS OF KINEMATIC PAIRS

Influence of various factors on quality of metallurgical products is considered. It is shown that quality of technological machines and aggregates, determined by their reliability and accuracy of operations performed during the operation of technological machines, depends on complex of their parameters. Relationship between the quality of technological machines and quality of manufactured products, characterized by accuracy of manufactured products, is determined. This relationship between the indicators of accuracy of manufactured products and quality of technological machine, in this case, depends on rigidity of machine design as a whole. This is due to the fact that the greater the rigidity of machine design, which also determines reliability of the machine, the higher is accuracy of technological operation and, accordingly, the higher is quality of the products. The influence of clearances in joints of kinematic pairs of crank machines on occurrence of dynamic loads leading to rapid failure of the sliding bearing liners is analyzed. Negative influence of clearances in kinematic pairs on reliability of technological machines and the accuracy of operations performed makes it necessary to develop constructive measures to create a gap-free connection of elements of kinematic pairs. Studies have shown that necessary effect can be obtained by using small-sized elastic pneumatic elements embedded in a kinematic pair. Constantly acting on the movable framework with an anti-friction liner attached to it, the elastic element selects clearance between the trunnion and the liner. The design of an elastic pneumatic device for sampling clearances in sliding bearings during operation of the rolling mechanism of the mold is described and reduction of the vibration level due to elimination of clearances is experimentally proved.

1. Boitsov B.V., Krainev Yu.V. Quality prob-lems in Russia. Kuznechno-shtampovochnoe proizvodstvo. 1997, no. 12, pp. 2–4. (In Russ.).

2. Ivanov A.P. Dynamics of systems with mechanical collisions. Мosсow: Mezhdunarodnaya programma obrazovaniya, 1997, 336 с. (In Russ.).

3. Brach R.M. Moments between impacting rigid bodies. Trans. ASME. I. Mech. Design. 1981, vol. 103, no. 10, pp. 812–817. (In Russ.).

4. Budd C., Dux F. The effect of frequency and clearance variations on single-degree-of-freedom impact oscillator. J. Sound and vibrations. 1995, vol. 184, no. 3, pp. 475–502.

5. Haines R.S. A theory of contact loss at revo-lute joints with clearance. Journal of Mechanical Engineering Science. 1980, vol. 22, no. 3, pp. 129–136.

6. Machines and units of metallurgical plants. Vol. 3. A.I. Tselikova red. Moscow: Metallurgiya, 1988, 680 p. (In Russ.).

7. Nikitin A.G., Abramov A.V., Gredina A.A., Garyashin V.V. Analysis of the operation of the crank-main bearing of crank-rocker mechanism of a jaw crusher. Izvestiya. Ferrous Metallurgy. 2016, vol. 59, no. 12, pp. 875–878. (In Russ.).

8. Orlov P.I. Basics of machine design. Vol. 1. Moscow: Mashinostroenie, 1988, 560 p. (In Russ.).

9. Zhivov L.I., Kolesnik F.I., Mishchanin V.G., Bulat V.I. Influence of clearances in the crank-slider mechanism on vibration and noise of the nailing machine. Kuznechno-shtampovochnoe proizvodstvo. 1974, no. 5, pp. 29–31. (In Russ.).

10. Nikitin A.G., Abramov A.V., Bazhenov I.A. Calculation of the parameters of an elastic pneumatic element made in the form of a cylinder with limited radial deformation. Izvestiya. Ferrous Metallurgy. 2018, vol. 61, no. 8, pp. 620–624. (In Russ.).