Industrial mastering the technology of surfacing of continuous casting machine rolls
DOI:
https://doi.org/10.31498/2225-6733.38.2019.181363Keywords:
continuous casting machine rolls, schemes of surfacing, differentiated approach, selection of material and technology, functional control systemAbstract
It has been established that differentiated approach to the choice of surface layer design, materials, technology, and equipment for surfacing makes it possible to increase the efficiency of the continuous casting machine rolls (CCMR) reconditioning. This involves the selection of the materials for surfacing of the rolls depending on their position in the secondary cooling zone, the intensity of wear, and thermomechanical fatigue cracking of surface layer. It has been shown that the breaks in the continuity of the surface layer formed from separated weld beads with gaps between adjacent welds results in the increase of the cracking resistance of the rolls without changing the chemical composition of the surface layer. Developing the continuous casting machine rolls surfacing technology, one should take into account that the optimum ratio of weld bead width to the diameter of the roll depends on the angle of inclination of the weld bead to the generatrix of the cylinder. The recommended limits of the angle of inclination changes have been identified and it has been shown that for each value of the angle there is a certain ratio of the weld bead width to the diameter of the roll; the ratio being independent of the diameter. The schemes of surfacing of the continuous casting machine rolls proposed and mastered in industrial conditions provide a differentiated approach to the choice of the weld bead width, the gap between them, and the angle of bead inclination in multiple directions from the middle of the barrel to the edges. To implement the proposed schemes of surfacing, a functional control system of surfacing installation has been developed. Fitting the control system with limit switches provides the given angle of the weld deposition pass to the generatrixReferences
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