METHOD OF ELECTRO-SLAG HARD-FACING OF COMPOSITE ROLLS WITH LIQUID METAL AND DEVICE FOR REALIZATION OF THIS METHOD

摘要

FIELD: foundry; methods and devices for electro-slag hard-facing of composite rolls; manufacture and repair of different rolls and roller tables provided with wear-resistant layer.;SUBSTANCE: proposed method consists in making diametral projection on billet and delivery of first portion of metal after fusion of this projection; rotary magnetic field is created on interface of slag and metal baths; direction of this magnetic field is changed periodically. Through slots in current-supply crystallizer are made in intermediate section; inner surface of current-supply section is narrowed downward. Device proposed for realization of this method is provided with bearing member mounted in opening of crystallizer for supporting the billet of roll by circular bead; provision is made for removal of crystallizer from operating position. Proposed method enhances quality of hard-facing layer due to accelerated rotation of liquid metal and stabilizes modes of starting hard-facing and separation of billet heating zone from zone of action of force electromagnetic field.;EFFECT: enhanced efficiency.;13 cl, 6 dwg, 1 ex