JP3350448B2 - Removal method of cutting burrs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently removing cutting burrs adhering to a steel material end face.

[0002]

2. Description of the Related Art In the process of manufacturing a steel sheet from a steel material such as a slab, the upper and lower surfaces of a slab to be cast are cut by a gas cutting machine, as shown in FIGS. 5 (a) and 5 (b). As shown in the figure, the burrs 3 are generated by the erosion and hang down on the end face (side surface) 2 of the slab 1, or at the same time, extend upward from below and cool down to adhere to the burrs 3 when cooled. This cutting burr is melted in the base material,
Consists of sagged and raised metal oxide.

[0003] If the cutting burrs remain attached to the slab end face in this way, in the next slab rolling step or the like, the burrs are directly caught and cause flaws, which causes quality problems. It is necessary to remove the burrs almost completely. Conventionally, the removal of the burrs was carried out by a worker using a hand scarf nozzle to perform ablation or grinding using a grinder. As a method that does not rely on erosion, a means for removing the cutting burrs with a normal cutting crater is also conceivable.

As shown in FIG. 3, the above-described burring deburring means uses a preheating jetting from a crater oriented in the advancing direction while advancing the crater 4 along the side surface (end face) of the steel material 1. The burr 3 is heated by a flame and oxidized to remove the burr 3 by ejecting oxygen. In this case, as shown in FIG. 4, the fusing crater 4 proceeds in the horizontal direction along the side of the steel material (in the direction of the arrow) to continue the fusing operation, but becomes a main heat source for continuing the fusing. Slag (unsolidified metal) is generated ahead in the traveling direction. However, since the generated slag hangs down due to gravity, the subsequent cutting becomes insufficient in heat source, resulting in that the side cutting does not proceed over the entire surface, and the cutting burrs remain on the rear half side as shown in FIG. Will be done.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and almost completely removes a cutting burr on a steel material end face without using a normally used cutting crater. It is an object of the present invention to provide a method for removing burrs which can obtain a smooth end face by cutting.

[0006]

According to the present invention, there is provided a method for removing burrs according to the present invention, which comprises using an erosion crater having an oxygen injection port between an upper nozzle and a lower nozzle.
It occurred when scarfing the upper and lower surfaces of the steel, the scarfing burrs adhering to the steel edge, a method of removing by ejecting scarfing oxygen from the oxygen spout is placed horizontally Rutotomoni scarfing Bali The edge of the steel material to which is adhered is characterized in that the erosion crater is inclined upward at an angle (θ) of 5 ° to 30 ° and relatively horizontally moved with respect to the steel material to perform the abrasion cutting. I do.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a specific example of a cutting crater used for carrying out the method of the present invention, in which 5 is an upper nozzle (upper unit), 6 is a lower nozzle (lower unit), 7 is an end wall, and 8 is a cutting The shoe 9 in contact with the steel material is a head block, and these form a cutting crater. Reference numeral 10 denotes a slit-shaped oxygen outlet provided at the position of the end wall 7;
Are arranged in the lower nozzle 6 and the upper nozzle 5, respectively, so that the fuel gas holes are interposed therebetween, and 13 and 14 are oxygen orifices for heating and shielding formed on the upper nozzle 5 side, and 15 is an oxygen orifice group for these oxygen orifices. It is a group of fuel gas holes provided at the sandwiched position. The ejection of oxygen and fuel is performed while maintaining a constant ejection angle with respect to the surface of the material to be cut, and although not shown, these oxygen and fuel supply means are connected to the upper and lower nozzles and the head block as appropriate. Is established.

In the present invention, the burrs on the side (end face) of the steel material are removed by using such a crater.
In this case, as shown in FIG. 2, while the cutting crater 4 is advanced in the direction of the arrow from one end of the end face of the horizontally placed steel material 1 to the other end, heating by the heating flame from the crater and slit-shaped oxygen Deburring work is performed by oxygen spouting from the spout.
In the present invention, in performing the burr removal operation, the cutting crater 4 is advanced in a state in which the direction of the cutting crater 4 is inclined upward by an angle θ to perform the cutting.

By simply moving the crater horizontally to remove the burrs, the generated slag, which is a heat source for continuing the erosion, hangs down from the end face of the steel material due to gravity. As the heat source becomes insufficient, it becomes difficult to perform abrasion over the entire end face. If the cutting crater is inclined upward at an angle of θ as in the present invention, the generated slag on the upper side of the steel material end surface is relatively increased, and a sufficient amount of slag is secured on the upper end surface of the steel material. Even if the slag hangs, a shortage of heat source does not occur, and continuous burrs can be removed over the entire end face.

If the inclination angle θ of the cutting crater is too small, there is no effect. On the contrary, if the inclination angle θ is too large, there is a problem in removing the cutting burrs.
It is necessary to be in the range of ３０30 °. This inclination angle θ is 5
If it is less than °, it is substantially the same as the case where the cutting crater is horizontal, and a sufficient amount of slag cannot be secured on the upper side of the end surface of the steel material, making it difficult to continue deburring cutting. If the inclination angle θ exceeds 30 °, the area of the steel material necessary for the generation of the molten slag in the forward direction of the cutting crater decreases and becomes small, so that the deburring operation cannot be continued.

The thickness of the cutting burr is usually 5 to 20 mm.
However, for relatively thin cutting burrs, the moving speed of the cutting crater can be increased (that is, the cutting speed can be increased). Therefore, it is necessary to increase the angle θ in order to slow down the crater advancing speed for thick burrs. In any case, in the present invention, an optimum angle for removing burrs may be selected within the above-mentioned inclination angle range in consideration of conditions such as the type of steel and the depth of cutting, not limited to the cutting speed.

Further, in the operation of removing the cutting burrs, fine burrs scattered on the upper and lower surfaces of the steel material side are removed by, for example, blowing off air, pressure water, etc., which are blown out from air nozzles provided above and below the steel material side. It is desirable. further,
As the crater used in the present invention, the utility model registration No. 25
It is preferred to use the 21550 "melting crater".

[0013]

As described above, according to the method of the present invention, it is possible to effectively and efficiently remove the burrs on the end face of a steel material such as a slab to obtain a smooth end face on the entire surface, and to separately obtain another end face. It is only necessary to operate while maintaining the directional angle of the crater within a predetermined range without replenishing the amount of heat by means or modifying the eroding crater itself, so the effect on equipment and operation is also very large .

[Brief description of the drawings]

FIG. 1 is a partial sectional explanatory view showing a specific example of a fusing crater used for carrying out the method of the present invention.

FIG. 2 is an explanatory front view showing an embodiment of the method of the present invention.

FIG. 3 is a plan view for explaining a process of removing the burrs from the slab.

FIG. 4 is a front view of FIG. 3;

FIGS. 5A and 5B are a perspective view and a front view, respectively, showing the state of adhesion of the burrs on the end surface of the slab.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Slab (steel material) 2 End face of steel material 3 Cutting burr 4 Cutting crater 5 Upper nozzle (upper unit) 6 Lower nozzle (lower unit) 7 End wall 8 Shoe 9 Head block 10 Slit-shaped oxygen outlet 11, 12, 15 Fuel gas vents 13,14 Oxygen vents

Claims (1)

(57) [Claims] 1. An oxygen jetting crater having an oxygen jetting port between an upper nozzle and a lower nozzle, wherein the fusing burrs generated during the upper and lower surface cutting of a steel material and attached to the end face of the steel material are removed by the oxygen jetting port. a method of removing by ejecting scarfing oxygen from relative end <br/> surface of steel is horizontally placed on Rutotomoni scarfing burrs are attached, the angle the scarfing crater upward (theta) 5 ° -30
A method for removing burrs, which comprises performing erosion while moving in a horizontal direction relative to steel with an inclination of °.