Method for controlling residual defects of leveling fluid
A leveling liquid and defect technology, applied in the direction of rolling mill control devices, metal rolling, manufacturing tools, etc., can solve the problem that the leveling liquid residue cannot be really eliminated, and achieve the effect of eliminating residual defects, reducing dosage, and improving surface quality
Active Publication Date: 2016-10-05
ANGANG STEEL CO LTD
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Problems solved by technology
In the past production process, the method of online treatment of leveling liquid residue without stopping the machine is to manually adjust the deviation correction system at the entrance of the leveling machine, manually control the position of the strip before entering the leveling machine on the DS side, and keep the defect area on the operating side out of the way , this control method can only be used as a measure to temporarily control the residual leveling liquid at the edge, and it has certain risks (when the sleeve is pulled at high speed, manual control of the deviation correction system will increase the risk of steel plate stamping), and it cannot really eliminate or control the leveling Occurrence of liquid residue
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[0017] The present invention is a method for controlling residual defects of leveling liquid, comprising:
[0018] 1) Adjust the distance between the air nozzle of the work roll gap blowing beam under the frame of the skin pass mill and the roll surface of the exit anti-wrinkle roll to 10-15mm;
[0019] 2) The flow rate of leveling liquid is controlled at 0.7-1.0L / min;
[0020] 3) Use constant rolling force to control the tempering machine mode;
[0021] 4) The skin-bending roll force is controlled between -10% and -5%;
[0022] 5) The pulling sleeve speed of continuous exit is ≤180m / min.
[0023] Clean all the air nozzles in the finishing area every time the finishing is stopped.
[0024] When replacing the skinning roll as required, replace the work roll first and then the intermediate roll. In addition to meeting the normal production requirements, it should also meet the work roll diameter ≥ 450mm and the intermediate roll diameter ≥ 530mm.
[0025] When producing EDDQ...
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The invention relates to a method for controlling residual defects of leveling fluid. The method comprises the steps that firstly, the distance between blowing air beam air nozzles of a roller seam of a lower working roller of a leveling machine rack and the roller face of an outlet crease-resisting roller is adjusted to range from 10 mm to 15 mm; secondly, the leveling fluid flow is controlled to range from 0.7L / min to 1.0L / min; thirdly, constant rolling force is adopted to control a leveling machine mode; fourthly, finishing roller bending force is controlled to range from -10% to -5%; and fifthly, the continuous annealing outlet sleeve pulling speed is smaller than or equal to 180m / min. Compared with the prior art, the method has the beneficial effects that the optimum positions of the blowing air nozzles are adjusted, technological process parameters are controlled, the aim that when cold rolling plates like EDDQ with the small rolling force are produced, the residual defects of the leveling fluid are controlled or removed is achieved, the cold rolling plate surface quality is improved, the use amount of the leveling fluid is reduced, the fault treatment time is shortened, and the production efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of cold rolling and continuous annealing, in particular to a method for controlling residual defects of leveling liquid when producing steel plates with low rolling force such as EDDQ. Background technique [0002] When producing EDDQ-grade automotive sheets and other steels that require high surface quality, it is necessary to pass skin-pass mills to achieve the following purposes: 1) Improve the flatness and flatness of the thin sheets to make the strip surface smooth , it is especially beneficial for subsequent deep drawing and other occasions with high precision; 2) The surface of the skinning roll used has been pre-ground and roughened, so the surface of the steel plate after skinning has a certain roughness, It can improve the adhesion of the coating and store a certain amount of grease, which is beneficial to the lubrication of the die during deep drawing; 3) Through smoothing, the yield platform can ...
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IPC IPC(8): B21B37/00
Inventor 王利国林森木孙晓宇洪天生陈思南
Owner ANGANG STEEL CO LTD