DOI: 10.52150/2522-9117-2025-39-21

V. M. Samokhval^1,*, Ph. D. (Tech.), Assoc. Prof., ORCID 0000-0003-0585-7225
O. S. Vasyliev¹, Ph. D. Student
R. V. Kontsedal¹, Ph. D. Student
Ye. V. Stasko¹, Ph. D. Student

¹Dniprovsky State Technical University, Dniprobudivska St., 2, Kamiaanske, 51918, Ukraine

^*Corresponding author: volsamokhval@gmail.com

SUBSTANTIATION OF THE SELECTING OF ROLLS DIAMETER BY STANDS OF BAR AND ROD ROLLING MILLS

Abstract. One of the main directions of development of rolling production is to increase the efficiency of using rolls, as a significant component of operating costs. The efficiency of using rolls is laid at the stage of choosing their dimensional parameters. Therefore, the development of a methodology for a reasonable choice of dimensional parameters of rolls, in particular for long products rolling mills, is an extremely important task. The purpose of the work is to develop a methodology for a reasonable choice of roll diameters for the stands of bar and rod rolling mills. The development of the methodology includes the analysis of indicators in the form of the ratio of roll diameters and the current values of the initial and final thickness of the rolls and their cross-sectional area for existing rolling mills. The main task of the research is to identify parameters that with sufficient accuracy reflect the dependence of roll diameters on the geometric parameters of the workpiece. From the analysis of the ratios of roll diameters and dimensional parameters of the rolled workpiece of existing mills, a directly proportional relationship was found between the roll diameters and the logarithm of the cross-sectional area of the workpiece on the stands of bar and rod mills. This relationship can be used to determine the roll diameter using the proportionality coefficient, the average value of which is 60. For the conditions of bar and rod mills, the well-known design parameters in the form of the ratio of the roll diameter to the final (index A) and initial thickness of the workpiece (index B) cannot be used due to the significant variability of their values. According to the proposed method for determining roll diameters for the conditions of typical bar mills, the most optimal is the use of five standard roll sizes, in the range from 600 to 300 mm. This number of roll sizes is determined on the condition that the cross-sectional area of the workpiece for one roll size changes no more than three times. The value of the roll diameters of one roll size is determined as the average value of the calculated diameters for the corresponding subgroup of stands and technology features. According to a similar criterion, i.e. a change in the cross-sectional area of no more than three times for one roll size, it is recommended to use at least two roll sizes for rod mill blocks, in the range from 280 to 160 mm. The proposed methodology can be used when designing new bar and rod mills, as well as during the reconstruction of existing mills of this type.

Key words: roll diameter, bar rolling mill, rod mill, group of stands of the mill, wire block, cross-sectional area.

For citation: Samokhval, V. M., Vasyliev, O. S., Kontsedal, R. V., & Stasko, Ye. V. (2025). Substantiation of the selecting of rolls diameter by stands of bar and rod rolling mills. Fundamental and applied problems of ferrous metallurgy, 39, 333-346. https://doi.org/10.52150/2522-9117-2025-39-21

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Received 02.08.2025
Accepted 21.10.2025
Published online 01.12.2025