Continuous caster and automatic casting process for automatically casting billet pouring box

Abstract

The invention discloses a continuous caster for automatically casting a pouring box in a billet production process. The continuous caster comprises a large ladle, a support device, a pouring box, a pouring box turning device, a crystallizer, a vibrating device, a secondary cooling spray cooling system, a tension leveler system, a dummy bar, a storing device, a steel billet cutting device, a conveying roller way and a steel billet pushing device. Key points are that: a half-hung penetration protective casing is arranged in the sprue gate of the crystallizer; a swinging flow groove is formed between the pouring box and the crystallizer; a hydraulic cylinder is connected to the swinging flow groove; an overflow tank is connected behind the swinging flow groove; a liquid surface control isotope emitting source is arranged in the crystallizer; a controller which is matched with the isotope emitting source is arranged, and is connected with the hydraulic cylinder; an automatic covering slag adding device is provided; and the pipe orifice of an output guide pipe of the automatic covering slag adding device faces a gap between a crystallizer wall and the outer wall of the protective casing. The continuous caster has the advantages of convenience in installing and overhauling, reduction in manual labor force, elimination of high-temperature manual slag dredging, increase in control accuracy and reduction in accident rate.

Description

technical field [0001] The invention relates to equipment for continuous casting of steel, in particular to an automatic production line for continuous casting machines for small billets (sections below 150mm*150mm square). Background technique [0002] According to the existing literature in the metallurgical industry bloom (200*180mm 2 Billets above), slabs (600*150 mm 2 The unmanned automatic casting technology of the above billet) has been realized by foreign manufacturers (voestalpine, SMS Germany, Continuo Italy, etc.). [0003] Only in billet continuous casting machine production has no successful examples. Billet refers to 150*150mm 2 Square, 120*120 mm 2 Steel billets with cross-sections below square, but precisely these small-section billets are the largest consumables for building materials in market demand, such as channel steel, angle steel, round steel, screw steel, φ8mm wire rod round steel, φ6.5mm wire rod round steel, etc. [0004] Usually, the continuo...

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Problems solved by technology

[0010]The open casting mode of steel flow has the following disadvantages: due to the high temperature molten steel fluid exposed in the air, severe secondary oxidation occurs, so that 3Fe+2O2 = Fe3O4 , Fe is oxidized to Fe3O4 impurities and produces a large amount of Waste solid oxides, in order to prevent impurities and oxides from entering the billet, manually remove them one by one with a thin iron rod, usually adjust the casting speed knob with the left hand, and a thin steel bar in the right hand continuously scoops out the slag in the crystallizer Operation, keep your eyes fixed on the fluctuation range of the molten steel level

When pouring open, if solid mold slag is added, the molten steel directly impacts the mold slag and wraps it into the molten steel. It will be wrapped in the steel by the molten steel during the crystallization period without time to liquefy, which will not only fail to lubricate, but also cause a lot of inclusions. If the content exceeds the standard, the purity of the steel will be greatly reduced. Therefore, adding mold slag during open casting is a violation of process discipline. Usually, open casting is lubricated with oil. The oil lubrication method is unstable and the thickness of the oil film is uneven, which is reflected in the surface quality of the billet. upper, (corner and inner arc surface cracks)

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