Lightly-pressed roll speed control method
A technology of roll speed control and soft reduction, which is applied in the field of roll speed control of tension leveling machine during continuous casting light reduction, which can solve the problem of overload, pressure roller light reduction accuracy and light reduction effect, tension leveler Problems such as the increase of the load moment of the drive roller 4, to avoid excessive load moment
Active Publication Date: 2013-04-24
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
When the production process of certain types of steel requires a large reduction, the load moment of the drive roller 4 of the tension leveler will further increase, and exceed the rated torque of the motor, resulting in overload
After the motor is overloaded, the driving roller 4 will be lifted up protectively, or even completely lifted due to a power outage, which will have a serious impact on the light-pressing accuracy and light-pressing effect of the pressing roller
Method used
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Embodiment Construction
[0045] The following will combine Figure 4 A typical implementation of the soft reduction roll speed control method of the present invention is introduced.
[0046] In this embodiment, the 3-strand stretching and straightening unit of the bloom continuous casting machine implements the soft reduction roll speed control, and the control method is as follows Figure 4 shown, including the following steps:
[0047] (1) According to the set value A of the drawing speed of the drawing and leveling unit, the linear speed of the driving roll of the last drawing and leveling machine in the light reduction range of the drawing and leveling unit is set as the reference value of the roll speed, and the reference value of the roll speed is set to Values are respectively given to the correctors provided in each tension leveler. The 3-strand tension leveling unit has 9 tension levelers in total. The soft reduction range is 3# to 8# driving rolls, and the soft reduction settings corresp...
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The invention discloses a lightly-pressed roll speed control method. The method comprises the following steps of: setting the linear speed of a driving roll of the last withdrawal and straightening machine in a plurality of withdrawal and straightening machines of a withdrawal and straightening unit as a reference value, correcting the set values of the linear speeds of the driving rolls of otherwithdrawal and straightening machines through a corrector based on the reference value, converting the linear speeds of the driving rolls into the revolving speed set value of motors through a converter, transmitting the revolving speed set value to a variable frequency transmission device, simultaneously detecting the revolving speed of the motor in real time through an encoder, and feeding the actual revolving speed of the motor back to the variable frequency transmission device so as to realize closed loop control of the revolving speed of the motors. According to the control method, the load distribution of the lightly-pressed withdrawal and straightening machines is more reasonable, and overload trip of the motors at high pressing quantity due to over high bearing torque of partial motors in the light pressing process of the withdrawal and straightening units can be avoided.
Description
technical field [0001] The invention relates to a continuous casting control method, in particular to a method for controlling the roll speed of a stretching and straightening machine during light reduction of continuous casting. Background technique [0002] The soft reduction technology refers to compensating the solidification shrinkage of the slab by applying a uniform external force at the end area of the liquid core of the continuous casting slab to form a certain amount of compression. On the one hand, it can eliminate or reduce the internal voids formed by the shrinkage of the slab, and prevent the solute-rich molten steel between the grains from flowing laterally to the center of the slab; The solute-enriched molten steel flows in reverse along the casting direction, so that the solute elements are redistributed in the molten steel, so that the solidification structure of the slab is more uniform and dense, and the purpose of improving center segregation and reduc...
Claims
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IPC IPC(8): B22D11/16
Inventor 金国平吴晔初
Owner BAOSHAN IRON & STEEL CO LTD