PIERCING MILL GUIDE RULER Russian patent published in 2018 - IPC B21B19/04 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to pipe rolling. Guide ruler includes the input and output sections divided by the crest, made in longitudinal section with a slope of the working surface. Contour of the ridge of the guide ruler in the longitudinal section is formed by a convex arc, smoothly conjugated with the contours of the input and output sections, the arc point located at the smallest distance from the longitudinal axis of the workpiece corresponds to the greatest value of the ratio of the distance between the rulers to the distance between the rolls. Contour of the contour of the ridge of the guide ruler in the longitudinal section with the contour of the input section corresponds to the point of capture of the workpiece by the rollers, and the conjugation with the outline contour of the output section is the point of exit of the sleeve from the rolls. Contours of the input and output sections in the longitudinal section can be formed by concave arcs that smoothly couple to the arc that forms the contour of the ruler's ridge and are calculated by the calculated radii according to the formulas given. Distances in the longitudinal section of the ruler are determined from the beginning of the contour of the input section of the ruler to the axis of the workpiece and from the end of the contour of the output section to the axis of the sleeve.

EFFECT: invention can be used in cross-helical rolling mills to produce liner billets.

5 cl, 6 dwg