Main features
Description of function
After the casting process the continuous strand is cut into shorter pieces called blooms. The cutting operation is done with gas torch cutting. A waste by-product of this cutting process is known as “burrs or beards” which can be found on the underside of the bloom at the torch cut positions.
These burrs or beards can cause considerable problems in downstream operations. To eliminate these problems, rotary deburring equipment can be installed in-between two of the roller-table rolls and will carry out in-line bloom deburring at roller-table speed.
The in-line removal of burrs is carried out by a series of symmetrical (double edged) hammers made of forged alloy steel. These hammers hang loosely on five axles positioned at 72 degree intervals around the deburrer roll. When the roll rotates the centrifugal force causes the hammers to extend to their deburring diameter. Due to the roll speed and the mass of the hammers they hit the burrs several times at high speed before the burr is removed from the product and guided via chutes into a scrap container.
Advantages
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Deburring on the fly. The deburring will be done during transportation of blooms at the roller table. The bloom must not be stopped or transported into reverse direction.
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Advantage for further process. The burr is beat with extended hammers. With this method the bloom edges will be flattened and this minimises damage to roller-tables and therefore the life time of rolling tools will increase.
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High reliability and low maintenance because the equipment is manufactured using standardised modules.
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Perfected machines. More than 200 deburring machines running in the world-wide steel industries.
Functional sequence
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As the Bloom is transported in casting direction along the roller-table the front of the Bloom passes the Bloom detection device. The controls system receives this signal and gives an output for the deburrer roll to start rotation (rotary direction is in casting direction of the Bloom).
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After a previously defined delay (depending on the speed of the roller-table) the roll is given the signal to lift. The time taken to lift the roll and the time for the Bloom to reach the roll are syncronised so they meet together and deburrs the Bloom. The vertical travel of the roll is adjusted so that the hammers project approx. 3 mm (adjustable) above the roller table pass line so that sufficient contact is made with the burrs to remove them. After approx. 50mm deburring surface, the roll is lowered to it’s idling position and rotation is stopped.
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The Bloom continues to move along the roller-table, the tail of the Bloom passes now the Bloom edge detection. The control system receives this signal and gives the output for the roll to rotate in the opposite direction (now opposite to the casting direction of the Bloom).
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After a previously defined delay (depending on the speed of the roller-table) the roll is given the signal to lift. The time taken to lift the roll and the time for the Bloom to reach the roll are synchronised so they meet together and deburr the Bloom
After another short delay the roll is lowered to it’s idling position and rotation is stopped.
Technical data:
| General Data |
| Usual applications |
Continuously cast products (slabs, blooms and billets) |
| Temperature range of product |
Up to 1.000°C |
| Machine Data |
| Rotor diameter |
480 mm |
| Rotation speed of roll |
Approx. 900 rpm |
| Production speed (on the fly) |
Up to 40 m/min |
| Electrical |
| Mains supply |
3 x 400 V, 50 Hz (other voltages also possible) |
| Power consumption |
15 to 112 kVA |
| Control voltage |
24 VDC |
| Hydraulic |
| Medium |
Mineral oil or water glycol |
| Pressure |
Min. 110 bar |
| Consumption (flow rate) |
Max. 50 l/min |
Image Gallery:
References
