MANDREL WITH VARIABLE TAPER OF WORKING SURFACE FOR CRYSTALLISER OF MACHINE FOR CONTINUOUS CASTING OF HOLLOW BILLETS Russian patent published in 2014 - IPC B22D11/04 

FIELD: metallurgy.

SUBSTANCE: mandrel of a crystalliser comprises a conical cartridge 1, having vertical supply and drain channels 2 to let cooling water through, installed on a cross beam 3, via channels of which cooling water is supplied into the cartridge. In the lower part of the cartridge there are through vertical slots 4 arranged evenly along the perimeter and forming cantilever "tabs" 5. The inner surface 6 in this part of the cartridge is made as conical, the length of the conical surface makes 0.1-0.2 from the slot length 4. The pipe 8 is installed coaxially to the cartridge 1 and may move along the axis by means of a hydraulic cylinder 9 of the axis. On the external surface of the pipe 8 there is a conical section 7, interacting with the conical section 6 of the cartridge 1. The travel of the pipe 8 does not exceed 0.5 of length of the conical section 6 of the cartridge 1. During movement of the pipe 8 as a result of interaction of conical sections 6 and 7 cantilever "tabs" 5 of the cartridge 1 are elastically deformed, and the taper of the external working surface of the cartridge is changed.

EFFECT: increased stability of a pouring process and improved quality of cast hollow billets.

4 cl, 4 dwg