Dual drum type continous casting device and method for continuous casting

In a twin-drum continuous casting apparatus for casting a metal sheet by supplying molten metal to a pouring basin formed by a pair of cooling drums rotating in opposite directions, and side gates, to cool the molten metal by contact with surfaces of the cooling drums, thereby forming a solidified shell, a twin-drum continuous casting method characterized by

• forming the cooling drum from a drum body having shaft portions at opposite end portions, and a drum sleeve fitted on an outer peripheral portion of the drum body, and
• implementing means for preventing various adverse influences due to differences in thermal expansion of constituent members of the drum body during casting, said means being such that
• many hot water channels, each extending in a drum axis direction along joining surfaces of the drum body and the drum sleeve, are formed at least within the drum body at predetermined intervals in a circumferential direction, and
• supply and discharge of hot water into and from the hot water channels are performed via hot water jackets formed along an inner surface of the drum body in order to heat the inner surface of the drum body.

A twin-drum continuous casting method comprising:

• providing outer layer water channels in a portion of each of cooling drums along a circumferential surface of the cooling drum;
• providing inner layer water channels inwardly of the outer layer water channels;
• and
• casting a metal sheet while supplying cooling water to the outer layer water channels and the inner layer water channels, and characterized by:
• measuring a temperature of cooling water discharged from the inner layer water channels;
• and
• controlling a temperature of cooling water supplied to the inner layer water channels in accordance with the measured temperature, thereby controlling crown of the metal sheet.

A twin-drum continuous casting method comprising:

• providing outer layer water channels in a portion of each of cooling drums along a circumferential surface of the cooling drum;
• providing inner layer water channels inwardly of the outer layer water channels;
• and
• casting a metal sheet while supplying cooling water to the outer layer water channels and the inner layer water channels, and characterized by:
• measuring a profile in a plate width direction of the metal sheet delivered from the cooling drums;
• and
• controlling a temperature of cooling water supplied to the inner layer water channels in accordance with the measured profile, thereby controlling crown of the metal sheet.

A twin-drum continuous casting method comprising:

• providing outer layer water channels in a portion of each of cooling drums along a circumferential surface of the cooling drum;
• providing inner layer water channels inwardly of the outer layer water channels;
• and
• casting a metal sheet while supplying cooling water to the outer layer water channels and the inner layer water channels, and characterized by:
• measuring a temperature of cooling water discharged from the inner layer water channels, and a profile in a plate width direction of the metal sheet delivered from the cooling drums;
• and
• controlling a temperature of cooling water supplied to the inner layer water channels in accordance with the temperature of cooling water and the profile, thereby controlling crown of the metal sheet.