Pulling-up-type continuous casting method

Abstract

A pulling-up-type continuous casting method according to an aspect of the present disclosure is a pulling-up-type continuous casing method for pulling up molten metal held in a holding furnace by using a starter. When the starter is accelerated to a predetermined pulling-up speed at a start of casting, the pulling-up-type continuous casting method includes a first acceleration section in which the starter is accelerated from a standstill state to a first speed at a first acceleration, a second acceleration section in which the starter is accelerated from the first speed to a second speed at a second acceleration, and a constant speed section in which the starter is pulled up at the first speed, the constant speed section being positioned between the first and second acceleration sections.

1 . A pulling-up-type continuous casting method for pulling up molten metal held in a holding furnace by using a starter, wherein
 when the starter is accelerated to a predetermined pulling-up speed at a start of casting, the pulling-up-type continuous casting method includes:   a first acceleration section in which the starter is accelerated from a standstill state to a first speed at a first acceleration;   a second acceleration section in which the starter is accelerated from the first speed to a second speed at a second acceleration; and   a constant speed section in which the starter is pulled up at the first speed, the constant speed section being positioned between the first and second acceleration sections.   
     
     
         2 . The pulling-up-type continuous casting method according to  claim 1 , wherein
 the first acceleration is an acceleration that will cause a tearing in the molten metal pulled-up by the starter before the pulling-up speed of the starter reaches the predetermined pulling-up speed when the starter is continuously accelerated from the standstill state at that acceleration, and   the second acceleration is an acceleration that will cause a tearing in the molten metal pulled-up by the starter before the pulling-up speed of the starter reaches the predetermined pulling-up speed when the starter is continuously accelerated from the standstill state at that acceleration.   
     
     
         3 . The pulling-up-type continuous casting method according to  claim 1 , wherein the first and second accelerations are equal to each other. 
     
     
         4 . The pulling-up-type continuous casting method according to  claim 3 , wherein each of the first and second accelerations is a maximum acceleration that a pulling-up machine that pulls up the starter can deliver. 
     
     
         5 . The pulling-up-type continuous casting method according to  claim 1 , wherein the pulling-up-type continuous casting method further includes:
 a third acceleration section in which the starter is accelerated from the second speed to a third speed at a third acceleration; and   a constant speed section in which the starter is pulled up at the second speed, the constant speed section being positioned between the second and third acceleration sections.   
     
     
         6 . The pulling-up-type continuous casting method according to  claim 1 , wherein the second acceleration is higher than the first acceleration. 
     
     
         7 . The pulling-up-type continuous casting method according to  claim 6 , wherein the second acceleration is a maximum acceleration that a pulling-up machine that pulls up the starter can deliver.