METHOD FOR MOUNTING ROD WITH SHORT MANDREL IN PIERCING MILL Russian patent published in 2000 - IPC

FIELD: rolled stock production, namely tube rolling mills, particularly method for adjusting rod with mandrel at outlet side of piercing mill with lateral delivery of rolled pieces. SUBSTANCE: turning of stem of rod with short mandrel engages with fork-like clamping member mounted in transporting unit. Before beginning of piercing process rod with mandrel is preliminarily moved (when head of arresting-regulating mechanism is open) to position in which tip of mandrel is spaced from piercing position by value Δ₁<Δ, where Δ - total gap between fork-like clamping member and turning of rod stem; Δ₁ - gap value between turning of rod stem and front end of fork-like clamping member. Then head of arresting-regulating mechanism is closed and simultaneously rod is moved by value Δ₁ in piercing position. It provides reduced cycle period. At piercing process there are gaps between surfaces of fork-like clamping member and surfaces of turning of rod stem allowing to realize piercing at large revolution number of rod. EFFECT: enlarged assortment of pierced sleeves, reduced time period of operation cycle. 8 dwg