KR970005457A - Control method of tundish nozzle and apparatus - Google Patents

Abstract

Control method and device of tundish nozzle to prevent intergranular quality defects in early castings due to the lack of floating separation of non-metallic inclusions contained in tundish inflow steel at the beginning of continuous casting plant It relates to a molten steel conveying process, which is contained in the ladle 10 to be transferred to the casting position of the continuous casting process, the process flowing into the tundish 20 through the long nozzle 12, and the main of the tundish 20 Passing between the dam 22 and the auxiliary dam 24 and flowing into the sliding nozzle 30 to be introduced into the mould 40, the process of spraying an appropriate amount of cooling water, and the molten steel totally transferred to the mold 40. When the filling amount reaches the predetermined position by the level sensor 42, the pinch roll 60 starts to drive the drawing of the cast steel, and the cast bar and the dummy bar 50 by the dummy bar separator 82 The process of separating and the cast In the continuous casting process passing through the cutting process to a certain length by the cutter (80), the stroke (openness) after the opening of the opening and closing of the sliding nozzle (30) 35 is calculated, the length of the tundish 20 Argon gas injection device is installed on the plate 33, the oscillator 35 of the sliding nozzle 30 is finely vibrated in the state of stroke 60mm or less when the auxiliary dam 24 flows into the switch 35 When the 200 starts to inject argon gas and the molten steel accumulates in the tundish of about 50 tons or more, the switch 35 of the sliding nozzle 30 is opened rapidly, and one second has elapsed from the sudden opening. Since it includes a step of adjusting the stroke of the switch of the sliding nozzle calculated by the width of the post slab manufacturing width, by controlling the opening degree of the sliding nozzle at the beginning of casting by a predetermined sequence In the tundish, the inclusions can be sufficiently injured and separated, and there is an effect of preventing the quality defects of the inclusions.

Description

Control method of tundish nozzle and apparatus

Since this is an open matter, no full text was included.

1 is a schematic explanatory view schematically showing a continuous casting apparatus for explaining the control method and apparatus of the tundish nozzle of the present invention, FIG. 2 is an enlarged cross-sectional view showing a tundish sliding nozzle, and FIG. Sequence diagram showing start control in sequence.

Claims (3)

The molten steel conveying process contained in the rad 10 to transfer to the casting position of the continuous casting process, the process flowing into the tundish 20 through the long nozzle 12, and the main dam 22 of the tundish 20 And a step of flowing into the sliding nozzle 30 through the auxiliary dam 24 to be introduced into the mould 40, the process of spraying an appropriate amount of cooling water, and the level of filling amount of molten steel totally charged in the mold 40. When the pinch roll 60 starts to drive when the predetermined position is reached by the sensor 42, the process of starting the drawing of the cast steel and the process of separating the cast steel and the dummy bar 50 by the dummy bar separator 82 And, in the continuous casting process that goes through the process of cutting the cast piece to a certain length by the cutter 80, the after-opening stroke (opening degree) of the opening and closing of the sliding nozzle 30, 35 is calculated, the tundish ( 20) overflows the auxiliary dam 24 and flows into the switch 35. When the switch 35 of the sliding nozzle 30 vibrates fine in the state of stroke 60mm or less, the argon gas injection device 200 which is installed on the plate 33 starts to inject argon gas, and the molten steel in a tundish. When the accumulation is about 50 tons or more, the switch 35 of the sliding nozzle 30 is opened sharply, and the stroke of the switch of the sliding nozzle calculated for each slab width after elapse of one second from the sudden opening is adjusted. A control method of a tundish nozzle comprising the step. The method of claim 1, wherein the stroke mold level setting value is gradually increased to a target level and determined according to a PID (proportion integral differentiation) control according to an error between the actual value of the level and the setting value. Ladle 10 and the ladle support for supporting the ladle 10, the tundish 20 at the bottom, the tundish support, the mold 40 to make the cast, the primary cooling in the mold 40 A device, a dummy bar 50 as a cast cooling support guide in the lower part of the mold, a pinch roll 60 for conveying the slab progressing from the surface to the center by cooling water spraying, and a plurality of for pulling and curving. In the control device of the tundish nozzle including a curved portion 70 having a roll 72, a cutting machine 80 for cutting the cast slab, and accessories such as correction post-treatment, installed in the lower portion of the tundish 20 Sliding nozzle 30 and the sliding nozzle 30 is composed of an upper nozzle 32 and a lower nozzle 34, the upper nozzle 32 is a plate 33, the lower nozzle 34 is a switch Each of the upper nozzle 32 and the plate 33 is fixed to the tundish 20, the lower nozzle 34 and the actuator 35 are connected to the hydraulic cylinder 36 through the coupler 37, the linear stroke of the hydraulic cylinder 36, the control device of the tundish nozzle, characterized in that 120mm .