Method for heating blank for rolling production

Abstract

A method for heating a blank in a first heating furnace and a second heating furnace. The first heating furnace includes a first chamber and a second chamber communicating with the first chamber. The method includes: 1) heating the blank in the first chamber to the temperature of less than 300° C.; 2) transferring the blank heated in the first chamber to the second heating furnace, and heating the blank to the temperature of between 350° C. and 850° C., where the temperature of the second heating furnace is detected using a thermocouple, and the temperature of the blank is detected by an optical thermometer; 3) transferring the blank heated in the second heating furnace to the second chamber, and measuring the temperature of the blank using a contact thermometer; and 4) transferring the blank from 3) to a rolling mill.

What is claimed is: 
     
         1 . A method for heating a blank in a first heating furnace and a second heating furnace, the first heating furnace comprising a first chamber and a second chamber communicating with the first chamber, and the method comprising:
 1) heating the blank in the first chamber to a temperature of less than 300° C.;   2) transferring the blank heated in the first chamber to the second heating furnace, and heating the blank to a temperature of between 350° C. and 850° C., where a temperature of the second heating furnace is detected using a thermocouple, and the temperature of the blank is detected by an optical thermometer;   3) transferring the blank heated in the second heating furnace to the second chamber, continuously heating the blank in the second chamber to increase the temperature of the blank in a range of 0-200° C., and measuring the temperature of the blank using a contact thermometer, where an accuracy of temperature adjustment of the blank in second chamber of the first heating furnace is ±10° C.; and   4) transferring the blank from 3) to a rolling mill.   
     
     
         2 . The method of  claim 1 , wherein the first chamber and the second chamber are disposed side by side, and the first chamber communicates with the second chamber via a heat pipe so that waste heat in the second chamber is transported to the first chamber. 
     
     
         3 . The method of  claim 1 , wherein the blank is introduced in and out of the second chamber of the first heating furnace along an axial direction of the first heating furnace. 
     
     
         4 . The method of  claim 1 , wherein a plurality of blanks is consecutively heated in the first heating furnace and the second heating furnace; the plurality of blanks in the first heating furnace is disposed end to end; and the plurality of blanks in the second heating furnace is spaced and parallel to each other.