BLOOMING MILL

The heated ingot are placed on the ingot buggy (two ingots at a time) by means of tongs crane which delivers it on to the receiving roller table of Blooming Mill.

The Blooming Mill is a 2-High horizontal stand, equipped with individually driven rolls. Each roll of the Blooming Mill is driven by 930 V, 8000 KW, 0-20-80 rpm motor.

Length of Roll - 2800 mm
Dia. of Roll - 1150 mm (Min.1100mm & Max.1180mm)

Rolls are used in pairs. Each roll set is ground with the required pass design (4 including the shaped beam pass). After rolling of about 1 lakh ton, the rolls are charged. The used rolls are sent for redressing in Roll Turning Shop. After redressing they are assembled and reused.

The Top Roll is balanced by counter weights. It is moved up and down by screw down mechanism driven by two motors mounted on the top of the stand. There are manipulator side guards on both sides of the Roll stand. This is to manipulate the rolling stock on to the required pass section of the roll. Tilters are fitted in the front manipulator for tilting the rolling stock whenever required. The total rolls from ingot to bloom is done in 11 - 17 passes.

After rolling, the bloom proceeds to the shear where the front and back ends are cropped off to eliminate defects and the bloom is cut into required length. Blooms intended for further rolling in Billet Mill are sent directly after cutting the front and back end. The shear is of the up-cut crank shaft type with maximum cutting force of 1000 Ton and operating speed of upto 10 cuts per minute. Crop ends are pushed down and conveyed to crop pit for cooling.
The Mill can roll square and rectangular blooms and also narrow width slab. Common Sizes of Blooms and Narrow Width Slabs

i) 320 x 320 mm
ii) 265 x 340 mm
iii) 260 x 300 mm
iv) Shaped blooms for Beam-450mm & Beam-600mm
v) Narrow Width Slab 200 x 320 mm
vi) Narrow Width Slab 200 x 420 mm