JPH0327728Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) This invention relates to a device that can efficiently remove cutting slag (also referred to as cutting burr or slag) that adheres to the back surface of the cut during gas cutting of thick metal materials. (Prior art) For example, when gas cutting a thick steel material such as a continuously cast slab, cutting slag protrudes and adheres to the edge of the back side of the cut, which can cause roll flaws and product flaws during rolling in the subsequent process. This becomes a major cause, leading to a decrease in yield. Therefore, it is required to reliably remove this adhered slag after cutting. As a measure to remove the adhered slag that occurs during cutting, instead of offline cutting or mechanical means using a grinder, online methods can be used to efficiently remove slag almost simultaneously with or following the cutting process. A method has been developed (Japanese Patent Publication No. 48-32492, Japanese Utility Model Application Publication No. 115134/1983, etc.). (Problems to be Solved by the Invention) However, even with these conventional online slag removal means, it is not possible to completely remove only the adhered slag due to the structure of the slag removal crater, the properties of the flame, and the arrangement state. It was difficult to do so, and there was a problem of damaging the base material. This invention solves these problems and provides a device that can follow the cutting operation or run parallel to the cutting line to reliably remove only the cutting slag without melting the base material. purpose. (Means for Solving the Problems) The gist of this invention to achieve this objective is to provide an apparatus for removing cutting slag produced on the back side of a workpiece by cutting with a cutting nozzle.
A pair of slag removal crater blocks are placed across the cutting line on the back side of the material to be cut and shifted in position in the cutting direction, and each of the slag removal crater blocks is connected to a plurality of craters arranged in parallel in the cutting direction. This is a cutting slag removal device characterized in that it is formed from. (Function) Since the slag removal nozzle block can be made to follow the cutting nozzle, the adhering slag can be removed before the temperature drops immediately after cutting.Moreover, the slag removal nozzle block can be placed across the cutting line and shifted in position. Since the slag removal nozzle blocks are arranged so that they do not interfere with each other, each of the slag removal nozzle blocks can effectively remove the slag generated on both side edges of the cut back surface. Furthermore, since the slag is thermochemically melted with a flame of fuel gas and oxygen, the base material is not damaged. Furthermore, since the slag removal nozzle block is constructed by arranging a plurality of nozzles in parallel, the adhered slag is reliably removed in stages. (Example) An example of this invention will be described below based on the drawings. FIG. 1 is a perspective view of the slag removal device, and FIG. 2 is a front view of the gas cutting nozzle and the slag removal nozzle.
As shown in the figure, a cutting base 3 is installed so as to straddle the metal material to be cut (base material) 1, and a lateral movement table 4 is mounted on the base 3 so as to be movable in the width direction of the base material 1. A gas cutting nozzle 2 is vertically provided on one end side of the horizontally moving table 4. Further, an L-shaped base 7 is attached to the other end side of the horizontal moving table 4 and extends to the back surface 1A of the base material 1. Slag removal nozzle blocks 6A and 6B are provided. As shown in FIG. 2, these slag removal nozzle blocks 6A and 6B are arranged so as to face each other across the cutting line formed by the cutting nozzle 2, and to face the slags 5A and 5B adhering to the cut back surface on the nearer side. . Furthermore, the cutting nozzle 2, the slag removal nozzle blocks 6A, 6B, and the slag removal nozzle block 6A,
6B in the cutting direction, as shown in FIG. 4, the center line of the cutting nozzle 2 and the tip of the slag removal nozzle block have a distance B, and the slag removal nozzle blocks 6A and 6B have a distance B in the cutting direction. The leading crater block 6 is placed at a shifted position.
There is a distance C between A and the trailing crater block 6B. The arrangement of the slag removal nozzles 6A and 6B is shifted so that the slag removal gas flames do not interfere with each other. In addition, distance B is 100 mm or more, and C is approximately 100 mm.
Approximately mm is suitable. In addition, each slag removal crater block 6A, 6B
are three craters 6A- each along the cutting direction.
1,6A-2,6A-3 and 6B-1,6B-
2 and 6B-3 are arranged in parallel. Each of these three craters 6A-1, 6A-2, 6A-3 and 6
B-1, 6B-2, 6B-3 are for preheating, for example.
It is used for melting and removal, and is used to remove adhering slag in stages. Note that the number of craters constituting the crater block may be arbitrary as long as it is plural. FIG. 3 shows the details of one slag removal nozzle and the relationship between the nozzle and the slag. The crater 6 has a fuel gas nozzle 20 in the middle and oxygen nozzles 21 and 2 on both sides.
2, which are connected to the fuel gas pipe 10 and the oxygen pipes 11 and 12, respectively. Each of the jet holes has a jet cross section shaped like a flat slit, which is more effective in removing slag than a conventional round cross-section crater, and it is also possible to adjust the width of the crater as necessary. Furthermore, the angle θ at which the flame produced by each of these jet holes collides with the slag 5 of the material to be cut is approximately 25
A range of ˜40° is preferred, but this angle may vary slightly depending on the number of vents forming the crater block. For example, the crater 6A in the illustrated example
-1, 6A-2, and 6A-3, the angle θ from the leading side to the trailing side gradually becomes an acute angle. That is, the flame nozzle 6A-1 is used for preheating the slag, and the flame target position (indicated by distance A from the slag attachment point on the side edge of the material to be cut in Figure 3) is 15 mm, aiming at the back end of the slag. (line in Figure 3) is crater 6A.
-2, for melting, the distance A is 8 mm, aiming at the almost center of the slag (line), and for crater 6A-3, for removal, the distance A is 0 mm, aiming at the slag adhesion point (line), and so on. I'm letting you do it. This angle change can be achieved, for example, by increasing the supply pressure of the outer oxygen pipe 11 or by increasing the pore diameter to increase the flow rate. Table 1 is an example of changing the supply pressure of fuel gas and oxygen to the craters 6A-1, 6A-2, and 6A-3, and each number is expressed as a pressure ratio with the pressure of the crater 6A-1 being 1, for example. . By adjusting the flame by gradually increasing the pressure, especially by gradually increasing the external oxygen supply pressure, the slag is sequentially preheated, melted, and removed. Moreover, since the present invention uses an oxygen flame instead of pure oxygen for slag removal, unlike melt cutting, it does not damage the base material. Note that the pressure setting is performed appropriately taking into consideration the steel type, temperature, time schedule, etc. In the illustrated example, the pair of slag removal nozzle blocks are configured to be movable following the cutting nozzle, but the present invention is not limited to this, and can also be used off-line, for example, to separate cut material. It is also possible to carry it to the line and fix it, and then install the crater of the present invention on the back side of the line, and perform the removal work while moving.

[Table] (Effects of the invention) According to the slag removal crater of this invention explained above, the slag generated and adhered during gas cutting of metal materials can be removed quickly and reliably without melting the base material. This contributes to an improvement in yield, and its practical effects are extremely large. According to experiments conducted by the present inventors, when removing slag from cold pieces using the device of this invention, 400 to 1000
mm/min, it has become possible to process hot pieces at high speeds of 800 to 2000 mm/min.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an embodiment of the crater according to this invention, Figure 2 is a front view showing the relationship between the cutting crater and the slag removal crater, and Figure 3 is a front view showing the relationship of the removal crater to the slag. , Figure 4 is Figure 2 A-A
It is an arrow view. 1... Material to be cut, 2... Gas cutting nozzle, 3... Cutting base, 4... Lateral moving table, 5... Adhesive slag, 6A, 6B
...Slag removal crater block, 7...Base.

Claims (1)

[Scope of utility model registration request] In a device that removes cutting slag produced on the back side of a thick metal material to be cut due to cutting with a cutting tip, a pair of slag removers are placed across the cutting line on the back side of the material to be cut and shifted in the cutting direction. A cutting slag removal device characterized in that a crater block is arranged, and each of the slag removal crater blocks is formed from a plurality of craters arranged in parallel in the cutting direction.