A Roll Gap Control Method After Breakout Occurs in Slab Continuous Casting Machine
The technology of a slab continuous casting machine and a control method, which is applied in the field of continuous casting, can solve problems such as damage to mechanical equipment, cracks in the center of slabs, and aggravate damage to mechanical equipment, so as to reduce the difficulty of processing, avoid defects in the center of cracks, and alleviate The effect of damage
Active Publication Date: 2017-11-10
CISDI ENG CO LTD
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Problems solved by technology
[0004] The above method is not timely enough, and the molten steel flows out from the breakout, causing damage to the mechanical equipment, aggravating the damage to the mechanical equipment, increasing the difficulty of handling after the breakout, and causing crack defects in the center of the slab
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Embodiment 1
[0033] A steel factory uses a straight arc continuous casting machine to produce billets with a section of 250mm×1870mm, the steel type to be produced is X, the casting speed is 0.95m / min, and the casting temperature is 1539°C. Sections are arc sections, sections 7-8 are straightening sections, sections 9-14 are horizontal sections, and sections 1-14 are fan-shaped sections for remote roll gap control.
[0034] Specific steps are as follows:
[0035] 1) During the casting machine production process, the three-dimensional temperature field of the casting machine is tracked in real time through the three-dimensional temperature field simulation model;
[0036] 2) In this example, the position of the safety line of the continuous casting machine is 1.1m away from the meniscus of the crystallizer, and the fluidity coefficient δ of the cast steel grade is taken as 0.94 (that is, it satisfies T 铸坯 >=δ·T liq is molten steel with fluidity characteristics, where T 铸坯 is the temperat...
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The invention discloses a roll gap control method after bleed-out of a slab caster. The roll gap control method comprises the following steps: S1, monitoring a three-dimensional temperature field (Tfield) of a continuous casting billet online in real time; S2, obtaining the volume Vsafe of molten steel with liquidity characteristics between a meniscus of a crystallizer and a safety line position of the slab caster at the current moment, and obtaining the volume Vsegment of the molten steel with the liquidity characteristics in a fan-shaped segment with the capability of remotely adjusting the roll gap at the current moment; S3, assuming that the Vsegment is increased to Vsegment1, calculating a variable quantity delta Gapbreakout between a fan-shaped segment roll gap value corresponding to the Vsegment1 and a fan-shaped segment roll gap value corresponding to the Vsegment; and S4, if the bleed-out occurs, immediately increasing the variable quantity delta Gapbreakout of the fan-shaped segment roll gap value to the fan-shaped segment roll gap value corresponding to the Vsegment1, and otherwise, returning to the S1. According to the roll gap control method disclosed by the invention, the risk that a large amount of molten steel leaks from a bleed-out part during the bleed-out is avoided, the damage degree of mechanical equipment is reduced, and the handling difficulty after the bleed-out is reduced; and meanwhile, by reasonably controlling the fan-shaped segment roll gap, the defect that center bursts are generated on casting billets can be avoided.
Description
technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a roll gap control method after a steel breakout occurs in a slab continuous casting machine. Background technique [0002] Among all kinds of accidents in continuous casting production, the most serious damage is the steel breakout accident. Breakout refers to that after the solidified billet shell leaves the mold during continuous casting, the billet shell cannot withstand the action of hydrostatic pressure and billet drawing force, and breaks at the weak point to make molten steel flow out. Breakout will not only affect continuous casting production, damage machinery and equipment, increase maintenance volume and cost, but also endanger personal safety. [0003] With the development of technology, although the occurrence rate of steel breakout accidents has been greatly reduced at present, due to various reasons, it will still inevitably occur. When steel breakout o...
Claims
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IPC IPC(8): B22D11/20
CPCB22D11/202
Inventor 孔意文韩志伟刘强邓比涛
Owner CISDI ENG CO LTD