On-line roll grinding method for carbon jacket hearth roll

Abstract

The invention provides an on-line roll grinding method for a carbon jacket hearth roll. According to the invention, for great accretion, temperature of each furnace segment is set to be 20 to 25 DEG C higher than normal temperature, a transitional coil which has been used less than 4 times and has a thickness of 0.5 to 0.7 mm is put in a furnace, tension in the furnace is eliminated, the roll is allowed to revolve for 8 to 12 min in a manner of combined inching after revolution for 4 to 5 min, then heating is carried out so as to control furnace temperature, and the above mentioned procedures are repeated for 3 cycles; for fine accretion, temperature of each furnace segment is set to be 10 to 15 DEG C higher than normal temperature, a transitional coil which has been used less than 4 times and has a thickness of 0.35 to 0.5 mm is put in a furnace, tension in the furnace is eliminated, and the roll is allowed to revolve for 1 to 3 min. According to the invention, accretion in the carbon jacket hearth roll can be rapidly removed; for the fine accretion, it is guaranteed that no accretion occurs any longer within 16 h after removal of the fine accretion; for the great accretion, it is guaranteed that no accretion occurs any longer within 30 h after removal of the great accretion; and therefore, an operating rate of a unit and rolling yield of products are greatly improved, and production cost and energy consumption are reduced.

Description

technical field

[0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for rapidly processing oriented silicon steel with a carbon sleeve hearth roll nodule on-line grinding roll treatment method for a continuous annealing furnace. Background technique

[0002] The continuous annealing furnace for intermediate annealing of oriented silicon steel generally uses a horizontal annealing furnace. The continuous annealing furnace is divided into 7 sections. The set temperature of 5 heating sections is 930 ° C, and the remaining 2 sections are cooling sections. At present, most silicon steel sheet manufacturers use graphite carbon sleeve rolls as the hearth rolls of continuous annealing furnaces. The carbon sleeve hearth rolls are prone to "nodules" after long-term use in the high-temperature environment of the continuous annealing furnace, which will cause defects such as bright marks, scratches and bruises on the str...