Abstract. The article discusses a method for calculating the strength of the roll collars for section mills, based on known formulas for the resistance of materials. The use of this technique, in contrast to the choice of recommended collar widths, which is common in practice and proposed in the literature, makes it possible to determine the minimum allowable collar width with the condition of maintaining its strength. The scope of calculations, in contrast to the finite element method, makes it possible to determine the width of the shoulder immediately at the design stage, taking into account the variation of the entire complex of roll pass design parameters. On the example of the calibration of a 30P channel used on a rail and beam mill, the calculation of the allowable width of the strength of the collars for each pass was made. According to the results obtained, the allowable width of the collars is not directly proportional to the depth of the groove, as is simply accepted in practice. The analysis of the results of calculations and practical data on the destruction of collars was carried out. The application of the developed technique makes it possible to more rationally use the working space of the roll.
Keywords: collar strength condition, rolling roll, calibre, groove, channel pass design.