8.13 By cautiously applying these relations, one can get a good estimate of the size, mass, and power requirements of a millin0 machine using its known power or mass as a starting point. The rolling mills presented in this report are based on actual mills, but when they had to be scaled down, or if data were missing, these relations for power to mass ratio and mean density were used. VIII.4.3.2: The Blooming Mill: The blooming mill is the first step in the manufacturing process after refining. It takes the ingots of refined steel which mass one ton and are 500 mm x 500 mm x 500 mm and rolls them to either blooms of cross section 125 mm x 125 mm or small slabs of thickness 75 to 125 mm by width of 400-700 mm. The mill is based on a standard 800 blooming mill (8.6). It has one main roller stand and it is a 2-high mill (see Figure 8.4). The rolls are reversible so that a work piece can be rolled through in one direction then rolled slightly thinner back in the other. This process continues until the desired thickness is reached. The main rolls have a diameter of 800 mm. The blooming mill also includes a large shear to crop the blooms and slabs and to cut them into pieces for the next stages of work. The following are the mill power, mass and required (not maximum) output per hour. The maximum output/per hour is also listed for reference. Power Mass Required Output Maximum Output 5000 kl-v 2700 tons 4. 4 T/hr 120 T/hr VIII.4.3.3: The Plate Mill: The plate mill receives the slabs after they come from the blooming mill. The plate mill used here is based on a 2800 mill (8.6), but has been reduced in width by one-half. While the basic 2800 mill can roll plate up to 2500 mm wide, the widest plate needed for the colony is about 1000 mm wide and therefore the basic mill is scaled down. The mill is a 1-stand, 3-high nonreversing mill with a roll diameter of 1150 mm. The
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