JP2003053530A - Scarfing device for steel product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality by eliminating scarfing defects, such as drooping or remaining of steel products without being scarfed for the purpose of removing the defects on the surface of bloomed steel products, continuous slabs, etc., by scarfing (known as hot scarfing). SOLUTION: This scarfing device for steel products is constituted by forming a plurality of communication ports 3a to 3i communicating with a nozzle 6 apart prescribed intervals along the longitudinal direction of a manifold 1, providing the base end side of the manifold with a supply port 8 for scarfing oxygen and providing the inside of the manifold with a piston 9 advancing and retreating in the longitudinal direction and is constituted in such a manner that the width of the nozzle for discharging the scarfing oxygen is adjusted according to the width size of the steel products 16 by adjusting the set position of the piston. A baffle board 11 facing the front of the supply port is disposed on the base end side of the manifold, by which the discharge pressure of the scarfing oxygen is made uniform.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel material for removing surface defects such as slab-rolled steel material and continuous slab by hot cutting (referred to as hot scarf). It relates to a fusing device. BACKGROUND OF THE INVENTION Oxygen is blown from the crater unit onto the surface of relatively moving steel such as slab-rolled steel, continuous slab, and the like. A steel material cutting apparatus for melting and removing impurities is known from Japanese Patent Application Laid-Open No. 9-94656 and Japanese Patent Application Laid-Open No. 9-210320. In addition, a piston that moves forward and backward along the longitudinal direction is provided inside the hold communicating with the plurality of craters, and the crater that discharges cutting oxygen by adjusting the setting position of the piston is adjusted according to the width dimension of the steel material. Some are made known. [0003] By the way, in the above-described fusing apparatus in which the crater for discharging the fusing oxygen is adjusted, a conventional manifold is used to secure the adjustable range. Since the supply port of the cutting oxygen is provided at the base end side, the discharge pressure of the cutting oxygen becomes non-uniform in the crater width direction, so that the molten metal cannot be In some cases, sagging occurred, or there was residual cutting. Therefore, the present invention is intended to eliminate such a poor cutting and improve the quality. [0004] For this purpose, the present invention provides a method for forming a plurality of communication ports communicating with a crater at regular intervals along a longitudinal direction of a manifold. In addition to providing an oxygen supply port, a piston that moves forward and backward along the longitudinal direction is provided in the manifold, and the width of the crater that discharges cutting oxygen by adjusting the set position of the piston depends on the width of the steel material. In the steel material cutting apparatus that is adjusted by adjusting the pressure, the discharge pressure of the cutting oxygen is made uniform by disposing a baffle plate facing the front of the supply port on the base end side in the manifold. It is characterized in that. Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a steel material cutting apparatus according to the present invention, and FIG. 2 is a transverse sectional view. In the figure, reference numeral 1 denotes a straight tubular manifold whose base end 2 is closed, and a plurality of communication ports 3a to 3i are formed on one side of the manifold at regular intervals along a longitudinal direction, and each of the communication ports is a crater. It communicates with the crater 6 via communication paths 5 a to 5 i provided in the unit 4. Reference numeral 7 denotes a buffer transverse passage provided in the middle of the communication passages 5a to 5i. Reference numeral 8 denotes a supply port for cutting oxygen provided on the base end portion 2 side of the manifold 1, and reference numeral 9 denotes a setting cylinder 10 which is provided so as to advance and retreat in the manifold along the longitudinal direction by operating the setting cylinder 10. It is a piston. Reference numeral 11 denotes a baffle plate disposed on the base end side in the manifold 1. The baffle plate is formed by welding a pair of support plates 13 on a mounting plate 12, as shown in FIG. And the baffle plate body 14 is fixed to the support plate by welding so that a space 15 is formed between the support plate 12 and the upper surface of the mounting plate 12, so that the baffle plate body 14 faces the front of the supply port 8. It is bolted in the manifold 1. In addition, fuel gas ejection ports are formed on both sides of the crater 6, but are not shown. As shown in FIG. 4, in this steel material ablation apparatus, four sets are arranged as a set so that the crater 6 is opposed to each surface of the bulk-rolled steel material 16 having a substantially square cross section. By supplying cutting oxygen into the manifold 1 from the port 8, the oxygen is blown from the crater 6 to each surface of the steel material 16 through the communication ports 3a to 3i and the communication paths 5a to 5i to burn the metal. The surface of the steel material is cut by the reaction. In addition, as shown in FIG. 5, the position setting of each cutting device is adjusted according to the size of the steel material 16, and the setting position of the piston 9 in the manifold 1 is adjusted by operating the setting cylinder 10. Since the oxygen in the manifold 1 does not reach the communication port behind the piston 9, the width of the crater 6 for discharging oxygen can be adjusted according to the width of the steel material. Since the baffle plate 11 is opposed to the supply port 8, oxygen is uniformly dispersed in the manifold 1.
Discharge from the crater 6 is prevented. By the way, FIG.
The piston of the cutting device having a crater width of 330 mm was set at a position 240 mm from the base end, and a pressure gauge was provided at a point 80 mm from the crater to measure the discharge pressure of the cutting oxygen, and a baffle plate was provided. These are shown in the graph for those not provided. As can be seen from the figure, while the conventional fusing apparatus without the baffle plate has a large fluctuation in pressure distribution, the provision of the baffle plate makes the pressure fluctuation gentle and the discharge pressure can be made uniform. Since the baffle plate 11 has a gap 15 formed between the baffle plate 11 and the upper surface of the mounting plate 12, the flow of oxygen into the communication port 3a closest to the base end is promoted, and the communication ports 3b, 3b. The direct inflow of oxygen into the vicinity of 3c is prevented by the baffle plate body 14, the discharge pressure of the communication ports 3a is increased, and the discharge pressure is made uniform at the communication ports 3b and 3c and thereafter. For this reason, the molten metal accumulates at the corner of the material where the discharge pressure is low, so that the molten metal does not sag or the uncut residue is not generated, thereby enabling uniform cutting. As described above, according to the present invention, a plurality of communication ports communicating with the crater are formed at regular intervals along the longitudinal direction of the manifold, and the supply of cutting oxygen to the base end side of the manifold is performed. In addition to providing a port, a piston that moves forward and backward along the longitudinal direction is provided in the manifold, and the width of the crater that discharges cutting oxygen by adjusting the setting position of the piston is adjusted according to the width dimension of the steel material. In the steel material ablation apparatus, the discharge pressure of the ablation oxygen is made uniform by disposing a baffle plate facing the front of the supply port on the base end side in the manifold. Eliminate defective cutting,
There is a beneficial effect of improving quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of a steel material cutting apparatus according to the present invention. FIG. 2 is a transverse sectional view of the steel material ablation apparatus of FIG. 1; FIG. 3 is a perspective view showing an embodiment of a baffle plate of the steel material ablation apparatus according to the present invention. FIG. 4 is a transverse sectional view of a steel material showing an embodiment of the steel material ablation apparatus according to the present invention. FIG. 5 is a cross-sectional view of a steel material showing an embodiment of the steel material ablation apparatus according to the present invention. FIG. 6 is a graph showing the distribution of the discharge pressure of cutting oxygen in the steel cutting apparatus according to the present invention. [Description of Signs] 1 Manifold 2 Base end 3a-3i Communication port 6 Crater 8 Supply port 9 Piston 11 Baffle plate 14 Baffle plate body 15 Interval 16 Steel material

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shoji Fujiwara             39 Motomoto-cho, Tokai-shi, Aichi Prefecture Daido Steel Co., Ltd.             Chita factory (72) Inventor Katsumi Kikuchi             39 Motomoto-cho, Tokai-shi, Aichi Prefecture Daido Steel Co., Ltd.             Chita factory F term (reference) 3K017 CB01 CE01 CH04                 4E002 AB03 BD20 CB03

Claims (1)

Claims: 1. A plurality of communication ports communicating with a crater are formed at regular intervals along a longitudinal direction of a manifold, and a supply port for cutting oxygen is provided at a base end side of the manifold. ,
A steel material in which a piston that moves forward and backward in the longitudinal direction is provided in the manifold, and a width of a crater for discharging cutting oxygen by adjusting a setting position of the piston is adjusted according to a width dimension of the steel material. In the fusing apparatus, a steel material characterized in that a baffle plate facing the front of the supply port is disposed on a base end side in the manifold so that a discharge pressure of fusing oxygen is made uniform. Cutting equipment.