JPS58364A - Fettling method for continuously cast ingot by gas cutting - Google Patents

Abstract

PURPOSE:To eliminate sticking of fins completely and to improve productivity by providing fittings for inhibiting the rotation of fins on the front surface of cutting blades, and cutting the fins while inhibiting the rotating behavior of the fins. CONSTITUTION:Fittings 14a, 14b for inhibiting rotation are mounted to upper, lower cutting blade holders at the front surfaces of upper, lower cutting blades 10a, 10b. Fins 5a, 5b contact the fittings 14a, 14b and the behavior of the rotation beyond these is inhibited. Therefore, the cutting or stripping effect by the blades 10a, 10b acts to cut melt-stuck points 13a, 13b, and the fins 5a, 5b fall downward by gravity through the clearances between the blades 10a, 10b and the fittings 14a, 14b. Therefore, the sticking of fins is completely eliminated, productivity is improved and direct feed rolling rate is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves gas-cutting strands that have been continuously cast to produce slabs of a predetermined length. Concerning how to remove (remove) Paris that occurs.

Strand 2 continuously cast in mold l as shown in Figure 1
is cut into slabs 4 of a predetermined length by the gas cutting device 3 (for example, the length of the slab is 4 to 1Qm depending on the order), and sent to the next end heating device or rough rolling process for processing. Ru.

By the way, it is known that the gas cut section 6 of the slab 4 generates a deposit (referred to as "paris") formed by re-solidifying a part of the melted body due to the heat of the melt. As shown by 5a to 5d in the side view of the slab 4 in Fig. 182(a), the paris adheres quite firmly to the cut portion, that is, the tail 6 of the slab 4, and the upper and lower surfaces of the head 7. This part is welded to a part of the slab 4.

FIG. 2(b) is a bottom view of the slab 4, and the bars J15b and 5d are elongated in the width direction d of the slab 4, and the size thereof is, for example, a thickness of 5.
~10m, length 20~70m, and the width of the sheet is approximately equal to the radius of the slab 4 (for example, 400~2200cm).

Since it has such a large shape and cannot be easily separated from the slab 4, its removal becomes a difficult task. If the product is sent to the rolling process with the flakes still attached, not only the product will have specific rolling defects, but also the rolling rolls may be damaged. Therefore, normally, as shown in Fig. 3≦2, a cylindrical housing 9 is provided in the middle of the conveying rolls 8a to 8d of the slab 4, and the lower cutting side blade 10 and the lower cutting side blade 10b are connected to the cylinders 11a and llb, respectively, to the horizontal scraping 9. , the cylinder 11
A method has been proposed for removing the particles J15a to 5d by operating the upper and lower cutting blades 10 and 10b, pressing the upper and lower cutting blades 10 and iob against the surface of the slab 4, and rubbing the slab with the upper and lower cutting blades tOa and 10b.

By the way, the inventors of the present invention, who have carried out the burr removal work using such means, have found that there are many points that need to be improved. That is, FIGS. 4 to 7 are schematic diagrams explaining the progress of deburring step by step.
, 1.10b are pressed against the upper and lower surfaces C of the slab 4.
When the is moved (transported), the Paris 5
1.5b is peeled off as a whole while remaining partially attached, and rises from the surface of the slab 4, forming a welding point 131 as shown in FIG.
Paris 51.5b shows a turning behavior around 1.13b, and if the welding strength of this welding point 13b is high,
The passing bars 95m and 5b shown in FIG. 7 pass through the deburring device while remaining attached to the slab 4 and go to the next process, causing rolling defects or damage to the rolling roll (as described above). If the welding strength of the welding points 13m, 13b is low, the pars 5m, 5b are easily removed due to friction with the upper and lower cutting blades 10m, 10b, but the welding points 13m, 13b are easily removed.
It is very common for 5crow and 5b to stick and be difficult to remove.

Therefore, the inventors of the present invention et al. have worked on the front surfaces of the upper and lower cutting side blades 10m and 10b as shown in Figure wi8.
Rotation prevention fittings 14, 14b were attached to the holders (not shown) of the upper and lower cutting side blades 10m, 10b parallel to ζ. The rotation restraining metal fittings 14m and 14b are, for example, band-shaped, and the upper and lower cutting side blades 10! , 10b so as to maintain a set separation distance. The separation distance is set appropriately depending on the thickness, length, and width of the bars 95 m and 5b, but the inventors have determined that the separation distance is 6 to 12 m in Example C of FIG.
■, width lO~2uwg.

Drilling a 1500cm long band from the lower cutting side blade 15~30mm
■ Release it and attach it to the front of it.

Now, after installing such a rotation prevention metal fitting 141.14b, the situation when deburring was started is shown in Figure 8 at bar 95m.
The peeling of 5b is similar to the state shown in FIG. 5 above.

Now, in the next step, that is, the step shown in FIG. 9, the paris 51.5b comes into contact with the rotation prevention metal fittings 14m, 14b, and further rotation behavior is inhibited, so that the upper and lower cutting side blades 10m, 10
Due to the cutting or peeling action of b, the welding points 13a, i3b are cut, and the welding points 13a, i3b are cut off, and the welding points 5m, 5b are at the 1st θ.
As shown in the figure, it falls downward (-) due to its own weight from the gap between the upper and lower cutting side blades 10 and 10b and the rotation prevention metal fittings 14m and 14b.

Thus, the adhesion rate of 50 to 60% before the installation of the rotation prevention fittings was completely eliminated by the present invention≦2, productivity was significantly improved, and the direct rolling rate was also significantly increased.

Therefore, the rotation prevention fitting according to the present invention has the above-mentioned 14a and 1.
4bI:II is not specified, and various forms can be used. For example, as shown in FIG.
Blade-like hardware 18 having a balance weight 17 via 6
To prevent the turning behavior of the bar with the blade-shaped metal fitting 18, as shown in FIG.
Alternatively, as shown in FIG. 13, a rectangular band fitting 21 may be welded to the lower cutting side blade 10b and the paring removed. In the present invention, the front surface of the cutting blade is defined as the front surface of the cutting blade in the vicinity of the cutting blade, where one end of the metal band 21 is in contact with the metal band 21 to prevent the turning behavior. Refers to a range.

Fig. 14 shows a partially cutaway perspective view of a further different rotation prevention fitting according to the present invention, 10b is the lower cutting side blade and 14b
' is a belt-shaped rotation prevention metal fitting whose both ends are welded to the side surface of the lower cutting side blade 10b, and the lower cutting side blade 10b and rotation prevention metal fitting 14b'
There is a space 22 in between.

FIG. 15 is a perspective view showing a further different rotation prevention metal fitting 23, and the rotation prevention metal fitting 23 is provided with a reinforcing lip 24. The rotation prevention metal fittings of the present invention can have various cross-sectional shapes, such as cylindrical, rod-shaped, triangular, comb-shaped, etc., and can be cut, cut not only on the entire blade but also partially (even if two pieces are attached), it is quite effective. It has been confirmed that there are many cracks on the bottom surface of the slab, so the cutting edge can be used not only on the top and bottom, but also only on the bottom, or if two stripes occur on the top, it can be used only on the top. According to the experience of the present inventors, it is highly reliable to provide cutting blades on the upper and lower sides.In this case, it is natural that the rotation prevention metal fittings are also attached to the earth cutting side blade 5.

Detail C: As explained above, the present invention provides a means for performing paris excision after gas cutting (two significant effects).

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the state of gas cutting of the strand, Figure 2
Figure (agriculture), (b) is a schematic diagram explaining the gas cutting s1 of a cast slab: the generated paris, Fig. 3 is a schematic explanatory diagram of the paris removal (cutting) situation, and Figs. Figs. 8 to 9 are explanatory diagrams of the situation in which the rotation is not removed, and Figs.
FIG. 13 is an explanatory diagram of the installation situation of the rotation prevention metal fitting according to the present invention, and FIGS. 14 and 1J15 are schematic perspective views showing still different installation situations of the rotation prevention metal fitting. DESCRIPTION OF SYMBOLS 1... Mold, 2... Strand, 3... Gas cutting device 4... Slab, 52-5d... Paris, 6...
Tail, 7... Spatula)', 81-8d... Conveyance roll, 9... Housing, 10t... Earth cutting side blade, 10b
...Lower cutting side blade, l1m. 11 b-... cylinder, 13fi, 13b-...
Welding point, 141, 14b14b', 18, 19, 21
, 22.23... Turning prevention fitting. Ya / Lada 3rd country 4th year Daio 2 Fire 6th country Dai 7th prisoner # 8th year / country Ke / 2rA Ya / J same JO tob procedure amendment book (method) % formula % 2 Title of the invention Method for cutting continuous cast slabs by cutting holes 1 Relationship between the person making the amendment and O Applicant (TS5) Representative of the new β main side iron removal type company Representative 11, Konomon-cho, Minato-ku, Tokyo Kengo &
Date of amendment order Showa shoulder gamma 9th east Subject of amendment @
■lll0 cylinder single *si* column in the application form. 7. Correction details IHIII Off 3 lines from the bottom - “Situation l!
To add Situation Explanation Diagram J after adA attack -

Claims (1)

[Claims] A cutting blade 1- that scrapes the surface after gas cutting that has adhered to the upper or lower surface of the continuously cast slab or both.
Therefore, in the cutting method, a turning-preventing metal fitting is provided on the front surface of the cutting blade, and the cutting action C of the cutting blade is performed while suppressing the turning behavior of the turning behavior of the continuous slab. Gas cutting paris removal method.