JP3091362B2 - Removal slag for fusing slag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crater for removing fusing slag generated in gas cutting of a slab.

[0002]

2. Description of the Related Art For example, in gas cutting of a thick slab produced by continuous casting or the like, fusing slag is generated at an edge of the back surface of the cut slab. That is, as shown in FIG. 5, when a flame 13 ′ is injected from the cutting crater 13 to the slab 12 to perform gas cutting from the front side (upper side in the figure) of the slab 12, the back surface 12 a of the slab 12 Fusing slag 14 is generated. Here, the adhesion state of the fusing slag 14 is about 10 mm in thickness and about 30 to 40 mm in width, and is fixed to the back surface 12a with the corner (edge) d as a root, and the part separated from the corner d is It is relatively lightly attached to the back surface 12a.
In the figure, the part of the other party (right side in the figure) that has been cut is omitted.

[0003] If this fusing slag 14 is left,
It is necessary to remove them because they hinder the process after cutting and cause rolling flaws, rolling roll flaws and the like to lower the production yield. The removal of the fusing slag 14 has conventionally been performed manually, but in recent years, as shown in FIG. 6, the removing crater 1 'is arranged in parallel with the back surface 12a, and the slag 14 Has come to be used.

However, in this method, as shown in FIG. 6 and FIG. 7, a part of the blown-off fusing slag 14 has a fin (also referred to as a secondary burr) on a portion of the back surface 12a adjacent to the slag attachment portion. .) F and adhered again. The fins f also have an adverse effect on the next step if left untreated, like the fusing slag 14.

Therefore, as shown in FIG. 8, the removal crater 1 is installed at an angle to the back surface 12a so as to be closest to the back surface at the corner d side, and the force of the flame hitting the fusing slag 14 is reduced by the corner d. Fusing slag 1
A method of preventing the generation of the fins f by removing 4 has been considered.

[0006]

However, in order to set the removal crater 1 'at an angle, the removal crater 1' is required.
A plurality of O-rings and the like for maintaining airtightness are mounted between a head block for holding airtightness and a manifold (both not shown) arranged in parallel with the back surface 12a to which the head block is connected. It was necessary to insert an inclination block and the like.

Further, in order to maintain the removal crater 1 'at an appropriate position, fine adjustment is required, and the number of parts is increased, so that a great deal of time is required for handling and maintenance. In particular, since loosening between parts due to heat is likely to occur,
Sufficient consideration must be given to a decrease in positional accuracy and gas leakage.

[0008]

SUMMARY OF THE INVENTION The present invention solves this problem and is a removal crater designed to efficiently remove the fusing slag. The jet outlets and the jet holes themselves are inclined so that the jet flow direction is pre-tilted at a certain angle with respect to the installation direction of the removal crater.

That is, according to the present invention, there is provided a cutting oxygen injection port having a slit shape, and a heating fuel gas injection hole group located above the oxygen injection port and arranged in parallel with the cutting oxygen injection port. A heating fuel gas orifice group and a shielding oxygen orifice group which are located below the lower block with the cutting oxygen port being interposed therebetween and which are arranged in parallel with the cutting oxygen port, respectively. In the removal crater provided with the upper block having, in the past, the cutting oxygen jet port, the heating fuel gas jet group and the shield oxygen jet group which were arranged in parallel to the back surface of the slab, were previously selected. The removal crater is easily and reliably installed by giving the same inclination to the main body of the removal crater based on the determined optimum inclination angle.

[0010]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 are side views from one and the other, respectively, of a removal crater suitable for describing the present invention. FIG. 3 is a front view of the removal crater shown in FIG.

Reference numeral 1 denotes a removal crater according to the present invention, reference numeral 2 denotes a head block thereof, reference numeral 2 'denotes an attachment portion to a manifold, and reference numeral 3 denotes an upper block firmly connected to the head block 2. The upper block 3 is composed of the head block 2 and the lower block 4 which is firmly connected.
End walls 5, 5 'are sandwiched and fixed on both sides,
As a result, a cutting oxygen injection port 6 having a slit shape is formed between the end walls 5 and 5 '.

Reference numeral 7 denotes a fuel gas injection hole group comprising a plurality of holes which are arranged in parallel with the long side of the cutting oxygen injection port 6 and open in the recess 8 at the tip of the upper block 3. Reference numeral 9
Is a shield oxygen outlet group which is opened in the same recess 8 in parallel with the fuel gas outlet group 7 and further outside (below). The direction of the shield oxygen orifice group 9 is slightly inclined upward toward the tip of the upper block 3,
As a result, the oxygen jetted from the shield oxygen jet holes 9 merges with the flow at the front while shielding the fuel gas jet holes 7 from the outside.

On the other hand, reference numeral 10 denotes a fuel gas injection hole group which is arranged in parallel with the long side of the cutting oxygen injection port 6 and opens in the recess 11 at the tip of the lower block 4. The symbol K denotes a flame when fuel gas, shielding oxygen and cutting oxygen are ejected from the fuel gas ejection holes 7 and 10, the shielding oxygen ejection holes 9 and the cutting oxygen ejection port 6, respectively. Is shown.

Further, in the case of the present invention, these jet ports (hole groups) 6, 7, 9, and 10 are provided with the cutting oxygen jet port 6 and the fuel gas jet port while the removal crater 1 is directly mounted on the manifold. Hole groups 7, 10 and oxygen vent hole group 9 for shielding
However, as shown in FIG.
Fusing slag 1 against back surface 12a so as to approach 2a.
4 is inclined at a constant angle θ along a direction orthogonal to the forming direction .

Here, the above-mentioned jet ports (hole groups) 6, 7,
The inclination angle θ of 9 and 10 is 10 ° to 2 with respect to the back surface 12a.
It is desirable to set the range to 5 °. As a result of various studies, θ
The best result is obtained at about = 17 °. Further, the distance L between the removal crater 1 and the slab 12 is suitably about 50 mm from the tip of the fuel gas ejection hole group 7.

In removing the fusing slag 14,
First, the removal crater 1 is mounted directly on the manifold. In this case, the removal crater 1 is inclined at a predetermined angle α (generally, the angle α is 30 °) along the corner d as shown in FIG. 1 so that the tip faces the back surface 12a.

Next, low-pressure oxygen is injected from the cutting oxygen jet 6 and fuel gas is jetted from the fuel gas jet holes 7 and 10 to form a heating flame. From the outside to start heating one end of the fusing slag 14 attached to the slab 12. Thereafter, the pressure of the fusing oxygen is switched to a high pressure to form an appropriate flame K, and the removal crater 1 is moved along the surface where the fusing slag 14 is attached to remove the fusing slag 14. In this case, the removal slag 14 is fixed by fixing the removal crater 1 and moving the slab 12 along the direction in which the fusing slag 14 is attached.
May be removed. The speed of movement in this case depends on the type of steel, but is suitably about 2 to 4 m / min.

Here, as described above, the fusing slag 14 is firmly fixed at the corner d at the lower end of the cut surface, and is relatively lightly attached at a portion apart therefrom and extending laterally on the back surface 12a. However, in the removal crater 1 according to the present invention, the flame hitting the fusing slag 14 is given by giving the cutting oxygen jet 6, the fuel gas jets 7, 10 and the shielding oxygen jets 9 a certain angle θ. Is gradually reduced as the distance from the corner d increases, and the generation of the fin f is prevented by removing the excess flame force.

Therefore, in the removal crater 1 of the present invention, it is not necessary to insert an inclination block or the like in consideration of airtightness between the head block 2 and the manifold in order to give the removal crater 1 an inclination. Therefore, the number of parts is small, and handling and maintenance are easy.
That is, when the removal crater 1 is used, similarly to the general removal crater 1 ′, the removal slag without fins f is reliably removed simply by mounting the removal crater 1 itself directly on the manifold. be able to.

The work using the removal crater 1 is mainly performed when the cast slab is in a hot state, but can also be applied in a cold state.

[0021]

As is evident from the foregoing description, removal crater of the present invention, the ejection direction of the fuel gas and oxygen, to the back side of the slab, soluble
Since it is inclined at a constant angle θ along the direction perpendicular to the forming direction of the cutting slag, the flame by each jet flow does not hit the fusing slag with the same force as before, and it also hits the removal crater. There is no insertion of a tilting block or the like for giving a tilt, and there is no deficiency during adjustment and use.

That is, in the case of using this removal crater, as in the case of a general fusing crater, simply removing the crater itself directly on the manifold can reliably remove the fusing slag without fins. The effect on the work is significant.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a partial cross-sectional view taken along an arrow I showing an entire removal crater.

FIG. 2, showing an embodiment of the present invention, is a side view along arrow II showing the entire removal crater.

FIG. 3 is an enlarged view of the removal crater shown in FIG. 1 along an arrow III.

FIG. 4 is a schematic view showing a position of a removal crater of the present invention with respect to a steel slab.

FIG. 5 is an explanatory diagram of gas cutting of a slab.

FIG. 6 is a schematic view showing a position of a conventional removal crater with respect to a steel slab.

FIG. 7 is a plan view taken along an arrow VII showing a fin formation state on the back surface of the billet.

FIG. 8 is a schematic view showing a position with respect to a steel slab when a conventional removal crater is inclined.

[Explanation of symbols]

 Reference Signs List 1, 1 'removal crater 3 upper block 4 lower block 5, 5' end wall 6 cutting oxygen injection port 7, 10 fuel gas injection group 9 shielding oxygen injection group 12 steel piece 12a back surface 14 fusing slag d corner f fins K flame

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Takanaka 11-1 Showa-cho, Kure-shi, Hiroshima Nisshin Steel Corporation Kure Works (72) Inventor Katsuyoshi Ishimura 11-1, Showa-cho, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. Kure Works (72) Inventor Tetsuya Fujimoto 11-1, Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Works (56) References Japanese Utility Model No. 2-109134 (JP, U.S.A.) ) Jikkai Sho 64-15042 (JP, U) Jiko 47-34756 (JP, Y1) Jiko 47-34757 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 7/06 B23K 7/10

Claims (2)

(57) [Claims] 1. A removal crater, which is mounted on a manifold and removes the slag by injecting a flame toward a fusing slag formed on a back edge of the backside of the slab as the slab is blown. Forming a cutting oxygen jet, a lower block having a fuel gas jet hole group for heating positioned above the oxygen jet and arranged in parallel with the cutting oxygen jet, and the cutting oxygen jet. An upper block having a heating fuel gas orifice group and a shielding oxygen orifice group arranged below the lower block and arranged in parallel with the abrasion oxygen outlet, respectively. The oxygen outlet, each fuel gas outlet hole group, and the shield oxygen outlet hole group, with the removal crater directly mounted on the manifold, so that the edge is closest to the back surface at the edge side, back The other hand, the fusing slide
A slag for removing fusing slag, the slag being provided at a constant angle along a direction perpendicular to the direction in which the slag is formed. 2. The angle between 10 ° and 2 ° with respect to the back surface.
The crater for fusing slag removal according to claim 1, wherein the slag is 5 °.