JPS6397345A - Slab tracking method - Google Patents

Abstract

PURPOSE:To prevent the temp. drop of slab cutting face and to save the energy for an edge heater by shifting a first slab at casting speed after cutting it and shifting the first slab at high speed after cutting a second slab. CONSTITUTION:The proceeding first slab 4 is shifted at low speed of casting speed even after cutting by a cutter 3, while holding the interval (d) between the mutual slabs to the narrow interval. In this way, the temp. drop of slab cutting face is prevented by the radiation heat and the energy for the edge heater 5 is saved. Next, at the time of cutting the second slab 4A as the same way, the first slab 4 is shifted at high speed to the next process and the interval between it and the second slab 4A is gradually moved away. And, the second slab 4A is shifted at high speed, at the time of cutting the next third slab.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for tracking slabs in continuous casting.

[Conventional Technique iA:i] A conventional slab tracking method will be explained with reference to FIG. That is, the continuously cast slab 1 is conveyed to the slab cutting section at the casting speed. At the slab cutting section, the slab 4 is cut into a predetermined length by a cutter 3 comprising a pair of torches 2 movably disposed in the slab width direction. In order to compensate for the lowest temperature of the cut surface and the longitudinal end surface of this slab 4, edge heaters 5 are provided on both sides of the slab cutting section 117r.The cutting of the first slab 4 at the front is completed. Then, the next second slab 4A is transferred at a low speed, that is, the casting speed, until the cutting is completed. Therefore, during this time, the first slab 4 and the next second slab 4A, which are being paid out at high speed, are The distance Ω reaches as much as 7 to 8 m.Therefore, the temperature of the tip end face of the second slab 4A is 100-odd degrees lower than that of the central part due to heat dissipation from the cut surface.

[Problems to be Solved by the Invention] Therefore, the edge heater must compensate for the lowest temperature at the tip of the slab, but energy is wasted for other parts.

In addition, since the temperature of the slab tip surface is low, HDR (1-1
(abbreviation of ot Dircct Rolling), the shock torque at the time of biting of the mill in the next process (hot rolling) increases.

[Means for Solving the Problems] In the slab tracking method according to the present invention, when cutting slabs in continuous casting, after cutting the first slab, the slabs are moved at the casting speed so that the slabs are mutually separated. The first slab is then moved at high speed after cutting the second slab.

[Function] In the present invention, since the first slab is transported at a slow casting speed after being cut, the distance between the slabs is several tens of IIwl (4
0 to 60 m) while maintaining a narrow distance. Therefore, temperature drop at the cut surface of the slab can be prevented as much as possible due to radiant heat. Then, when the next second slab is cut, the first slab is almost inside the edge heater, so it is moved at high speed in order to perform the subsequent steps smoothly.

[Jikho Awakening M] The method of the present invention will be explained below with reference to the drawings.

FIG. 1 is an explanatory diagram of the method of the present invention, showing a low-speed transition state of the first slab, and FIG. 2 similarly showing a high-speed transition state of the first slab, with the same reference numerals as in FIG. 3. Therefore, the same reference numerals are given and the explanation will be omitted.

As shown in FIG.
Even after the slabs are cut at one place, the casting process continues at a low casting speed, and the casting process continues while maintaining the spacing d between the slabs at a narrow interval of 40 to 60 m. As a result, the temperature of the cut surface of the slab can be prevented from decreasing due to radiant heat, so that the energy of the edge heater 5 can be saved. Specifically, in the conventional case, the temperature drop at the cut surface of the slab was about 50°C, but according to the method of the present invention, the drop was only about 20°C. The energy savings for this was therefore approximately 5%.

Next, as shown in FIG. 2, when the second slab 4A is cut in the same way, the first slab 4 is transferred to the next process at high speed and the distance between it and the first slab 4A is gradually widened. , and the second slab 4A is transferred at high speed when the next third slab is cut.

[Effects of the Invention] As described above, according to the present invention, the interval between the slabs is kept narrow during the low speed transition of the first slab.
Radiant heat can prevent temperature drop at the cut surface of the slab as much as possible. Therefore, the energy of the edge heater can be saved, and even in the case of I-[DR, the tip of the slab can be maintained at a high temperature.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the low speed transition state of the first slab according to the method of the present invention, FIG. 2 is an explanatory diagram showing the high speed transition state of the first slab, and FIG. 3 is an explanatory diagram of the conventional method. . 1... Continuously cast piece, 3... Cutter, 4... First slab, 4A... Second slab. Agent Patent Attorney Muneharu Sasaki Procedural Amendment (Voluntary) November 21, 1986

Claims (1)

[Claims] In cutting slabs in continuous casting, after cutting the first slab, the first slab is moved at the casting speed to keep the interval between the slabs small, and then after cutting the second slab, the first slab is moved at the casting speed. A slab tracking method characterized by transferring slabs at high speed.