JPS6055247B2 - Gas cutting burr removal method for continuously cast slabs - Google Patents

Description

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

As shown in Fig. 1, a strand 2 continuously cast in a mold 1 is cut into a slab 4 of a predetermined length by a gas cutting device 3 (for example, the length of the slab is 4 to 10,771 cm depending on the order). ) and sent to the next end heating device or rough rolling process for processing.

By the way, it is known that due to the above-mentioned gas cutting, deposits (referred to as burrs), which are formed by re-solidifying a part of the main body melted by high heat, are generated at the gas cut portion of the slab 4.

The burrs are 5a to 5d in the side view of the slab in Fig. 2a.
As shown in , it is quite firmly attached to the cut portion, that is, the tail 6 of the slab 4 and the upper and lower surfaces of the head 7, and one part is welded to a part of the slab 4. Figure 2 is a bottom view of the slab 4, and the burr 5
b and 5d extend in the width direction of the slab 4, and have a thickness of, for example, 5 to 10 m. n, length 20 to 7 - and width approximately equal to the width of the slab 4 (for example, 400 to 2200 Tm). 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 burrs attached, not only will the product develop rolling flaws, but the rolling rolls may also be damaged. Therefore, as shown in FIG. 3, a housing 9 is usually provided in the middle of the conveying rolls 8a to 8d of the slab 4, and the upper cutting blade 10a and the lower cutting blade 10 are connected to the housing 9 to the cylinders 11a and llb, respectively. , operate the cylinders 11a and llb, press the upper and lower cutting blades 10a and 10b against the surface of the slab 4, and rub the upper and lower cutting blades 10a and 10b to remove burrs 5a to 10b.
5d has been proposed.

By the way, the inventor of the present invention, who has carried out deburring work using such means, has 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. As shown in FIG. 4, the upper and lower cutting blades 1
0a and 10b are pressed against the upper and lower surfaces of the slab 4 and the slab 4 is moved (transported) in the direction of the arrow 12 with a conveyor roll (not shown), burrs are formed as shown in FIG. 5a
, 5b is peeled off as a whole while a part remains attached to the slab 4.
It rises from the surface of the welding point 13a, as shown in FIG.
The burrs 5a and 5b exhibit rotational behavior about the center 13b.
In this case, if the temperature of the slab 4 is as low as 500 to 700°C, the welding points 13a, 13
b is broken, and the burrs 5a and 5b are removed. However, the slab 4 immediately after gas-cutting the continuously cast strand 2 as in the present invention is usually at an extremely high temperature of 700 to 900°C or higher, and for example, the welding points 13a, 13
When the welding strength of b is high, the burr 5a is formed as shown in Fig. 7.
, 5b pass through the deburring device while remaining attached to the slab 4 and proceed to the next process, causing rolling defects or damaging the rolling rolls as described above. Moreover, even if the welding strength of the welding points 13a, 13b is low, the burrs 5a, 5b are formed due to friction with the upper and lower cutting blades 10a, 10b.
Although they are easily removed, the burrs 5a and 5b often adhere and cannot be removed. The present invention aims to fundamentally solve the above-mentioned problems and provides an efficient and reliable method for removing the burrs.

Now, as shown in FIG. 8, the inventor brought a cutting receiving plate 14 into contact with the cut surface 4a of the slab 4 during deburring.

The cutting receiving plate (hereinafter referred to as receiving plate) 14 is a plate-shaped body, and is formed to protrude from the cut surface 4a by a set height h and cover the cut surface 4a. The protrusion height h is the burr 5a, 5
Although the thickness, length, and width of b are appropriately set, the inventor has set the thickness to 20Tfr! in the example shown in FIG. A receiving plate 14 having a protruding height of n1 and H5O7rgn was brought into contact with the cut surface 4a. FIG. 8 shows a situation where deburring is started after the receiving plate 14 is brought into contact with the cut surface 4a, and the burrs 5a,
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 burrs 5a and 5b come into contact with the receiving plate 14 and further rotation behavior is inhibited, so that cutting or peeling by the upper and lower cutting blades 10a and 10b is prevented. As a result of this action, the welding points 13a, 13b are cut. Upper and lower cutting: When the cutting blades 10a and 10b reach the receiving plate 14, the cutting ends and only the slab 4 is sent in the direction of the arrow 12, and together with this, the upper and lower cutting blades 10a and 10b are also cut as shown in FIG. As a result, the burrs 5a and 5b fall downward under their own weight. Thus, the adhesion rate of the present invention is 50
~60% was completely eliminated by the present invention, productivity was significantly improved, and direct rolling rate was also significantly increased.

Now, as mentioned above, when starting deburring, the receiving plate 14 is brought into contact with the cut surface 4a of the slab 4, but the receiving plate 14 is moved as shown in FIG. 10, for example. It is possible to bring it into contact with the cut surface 4a by the movement associated with this.

In other words, in FIG. 10, when the cutting blade 10 stops at a predetermined position and the slab 4 is moved in the direction of the arrow 12, the relative
The cutting blade 10 scrapes on the surface of the cast slab, and a receiving plate 14 is provided.
is held by an arm 16 that is rotatably supported on a rotating shaft 15. The arm 16 is connected to a cylinder 17, and by controlling and driving the cylinder 17, the receiving plate 14 is cut just before the upper and lower cutting blades 10a and 10b start cutting off the burrs 5a and 5b. It adheres evenly to the surface 4a and suppresses the turning behavior of the burrs 5a and 5b. As described above, the main purpose of the receiving plate 14 of the present invention is to suppress the rolling behavior of burrs, and as long as it can exhibit the above-mentioned function, it has good adhesion to the cut surface 4a and 4a
Although the protrusion height h of the cross section is not particularly limited, for example, when the receiving plate 14 is in contact with the cut section 4a, the cut section 4a
When the gap between the burrs 5a and 5b becomes larger,
When the length of the burrs 5a and 5b is short, or when the burrs 5a and 5b do not peel off from the surface of the cast slab and are crushed as shown in FIG. 11, the burrs 5a and 5b enter the gap,
Reliable resection may not be possible.

However, the cut surface of slabs is not necessarily smooth;
Furthermore, due to the drive mechanism of the receiving plate 14, etc., it may be difficult to bring the receiving plate 14 into close contact with the entire surface. However, in the experience of the present inventor, the receiving plate 14 is brought into contact with the cut surface 4a so that the gap may partially be about 207 m or less, but preferably within 2 to 5 m. It was effective to configure it as follows.

Furthermore, since burrs are often generated on the lower surface of the slab, the receiving plate 14 is constructed into separate plate-like bodies 14a and 14b corresponding to the upper and lower cutting surfaces 4a1 and 4a2, respectively, as shown in FIG. It is also possible to contact only the lower side, or if it occurs more frequently on the upper side, it is also possible to contact only the upper side, but in the experience of the present inventor, it is more reliable to provide cutting blades and receiving plates on the upper and lower sides. In the present invention, the term "receiving plate covering the cut surface" and "bringing the receiving plate into contact with the cut surface" are used in this sense.

As a means for bringing the receiving plate 14 into contact with the cut surface 4a, in addition to the embodiment shown in FIG. 10, for example, as shown in FIG. As shown in FIG. 14, a traveling cylinder 20 is mounted on a pedestal 19 that moves up and down to the slab transfer path via an elevating cylinder 18, and is connected to the traveling cylinder 20. A structure in which the receiving plate 14 is held at the tip of the holding rod 21 and the receiving plate 14 is moved in parallel with the direction of conveyance of the slab 4, or a structure in which the slab 4 is stopped and the upper and lower cutting blades 10a, 10b are moved. In the case of deburring by moving, the function of the present invention can also be achieved by configuring the receiving plate 14 so that it can be raised and lowered via the lifting device 22 at the cutting surface stop position as shown in FIG. It is possible to demonstrate this.

As described above in detail, the present invention is highly effective in removing burrs after gas cutting.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the state of gas cutting of the strand, Figure 2
Figures A and b are schematic diagrams explaining the burrs that occur in the gas cut section of slabs, Figure 3 is a schematic diagram of the deburring (cutting) situation,
FIGS. 4 to 7 are explanatory diagrams of the situation when burrs are not removed, FIGS. 8 and 9 are explanatory diagrams of the situation of deburring according to the present invention, and FIGS. 10 and 13 to 15 are diagrams of the present invention. These show different embodiments of the receiving plate holding structure based on the invention,
Fig. 10 is a plan structural view, Figs. 13 to 15 are side sectional structural views, Fig. 11 is an explanatory view of the situation when the burr is not removed, and Fig. 12 is a perspective view showing another embodiment of the receiving plate. It is. 1... Mold, 2... Strand, 3.
... Gas cutting device, 4 ... Slab, 5a ~
5d...burr, 6...tail, 7...
... Head, 8a to 8d ... Conveyance roll,
9...Housing, 10a...Upper cutting blade, 10b...Lower cutting blade, 11a, 11b...
... Ulinder, 13a, 13b... Welding point, 14, 14a, 14b... Cutting receiving plate, 15,
15a... Rotating shaft, 16, 16a...
Arm, 17... Ulinder, 18...
Lifting cylinder, 19... Frame, 20...
... Traveling cylinder 21 ... Holding rod, 22
······lift device.

Claims (1)

[Claims] 1 In a method of removing burrs after gas cutting adhering to the upper or lower surface of a continuously cast slab, or both, by using a cutting blade that scrapes on the surface, the cut surface is covered with the cut surface of the slab. A method for removing burrs by gas cutting from continuously cast slabs, characterized in that the burrs are removed while suppressing the turning behavior of the burrs caused by the cutting action of the cutting blade.