MANDREL FOR MAKING TUBES IN DIE ROLLING MILLS

摘要

FIELD: tube production, possibly in mills for die rolling of tubes. SUBSTANCE: mandrel includes variable-conicity profile. Conicity value of back end of mandrel alphaH consists 0.7 alphaT and it is inversely proportional to wall thickness of rolled tube. Length value l of mandrel portion with less conicity consists l=(0.3 - 0.5)Ltot and it is proportional to wall thickness of rolled tube. alphaH - conicity value of portion with profile of less conicity; alphaT - conicity value of mandrel portion with profile of larger conicity; l - length of portion with less conicity; Ltot - total length of working portion of mandrel. EFFECT: enhanced accuracy of tube size due to reduced wall thickness difference, lowered metal consumption. 2 dwg