METHOD OF ENCASING PROFILE PRODUCTION Russian patent published in 2008 - IPC B21B17/14 

FIELD: technological processes.

SUBSTANCE: invention may be used for production of encasing steel profiles from welded tubular billets by method of cold sink drawing-down. Method includes deformation of hollow billet in rollers of cages and creation of longitudinal pulling force at identical speeds of rollers' rotation in all cages until profile with required dimensions is obtained. Deforming is carried out by anti-crossbreaks with preservation of perimeter without account of billet thickness and further calibration of profile. Formation of sections that are hard-to-reach for technological tool is performed by their exposure to neighbouring active parts, which are subjected to rollers effect. Angles of bent end during deformation of profile elements are selected based on condition of equality of ratio of bent end angles values for smoothly deformed sections and for intensively deformed sections 3-5. Directions of deformations are selected so that centres of masses of sequentially produced profile during billet displacement from cage to cage are located along single straight line that matches rolled metal axis.

EFFECT: invention allows to expand technological resources of rolling mill; to increase quality of articles; to simplify design and reduce mill material intensity and power inputs.

2 cl, 4 dwg