An upper clamping unit and a sub-clamping unit are respectively configured on the upper center of the main frame and on both sides of the front of the mounting portion, a side surface pad unit and a base surface pad unit are configured on one side and the front surface portion of the main frame so as to fix the upper part of a casting block, and the casting block is supplied from the upper portion through a gantry loader such that a separate transfer device is not necessary to make the fabrication process reasonable.