JPS6037156Y2 - Fusing slag removal equipment for steel billets - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for removing slag from melt cutting of a steel billet.

For example, a slab manufactured by continuous casting equipment is melt-cut into steel slabs of a predetermined length, but molten slag generated during the cutting adheres to the lower surface of the steel slab, forming so-called torch sag.

If a steel billet with melting slag (referred to as torch sag) still attached is hot-rolled, bite flaws in the rolling rolls, lamination flaws on the surface of the rolled product, etc. will occur. needs to be removed.

Conventionally, as a device for removing the fusing slag, a hydraulic cylinder is used to move the steel billet to be melted to a predetermined length vertically by a hydraulic cylinder at an arbitrary position below between the rollers of the conveying roller table, perpendicular to the conveying roller table. Some machines are equipped with a turret for cutting steel pieces by melting and cutting slag on the turret.

With this conventional device, the cutting slag that has been cut and removed by the cutter adheres to the cutting tool, and when cutting and removing the cutting slag again, the cutting tool and the steel piece do not come into complete contact with each other, so it is difficult to completely remove the cutting slag. It may not be possible to remove it by cutting.

This is particularly likely to occur when cutting off slag from a high-temperature steel piece whose surface temperature exceeds 500°C.

In addition, a scale layer is normally formed on the surface of the steel piece, but when the cutting slag is cut and removed, this scale flakes off and accumulates around the cutter, causing the cutter and the steel piece to no longer be in complete contact, as described above. Sometimes.

On the other hand, the work of cutting and removing the melting slag is usually done at a cycle of one steel slab every 1 to 2 minutes, depending on the casting speed of the steel slab, and the contact time between the cutter and the high-temperature steel slab is calculated at a calendar rate. It becomes more than 20%.

Therefore, the life of the cutter is shortened due to the thermal fatigue experienced at this time, but in the conventional device, the cutter has to be replaced at least once a week.

The present invention is intended to solve the problems of the conventional device as described above, and an embodiment thereof will be described below with reference to the drawings.

In Fig. 1, 1 is a steel piece 2 cut to a predetermined length.
A roller table for transporting, for example, to a heating furnace,
A concave pedestal 3 is installed between the rollers at arbitrary positions on the roller table 1, straddling the roller table 1.

Between the pillars 3a on both sides of the gate-shaped pedestal 3, a roll-shaped cutter mount 4 is rotatably supported horizontally by bearings 5, perpendicular to the roller table 1 and located below between the rollers.

A cutter 4a for cutting the fusing slag 2a of the steel piece 2 is removably provided on the outer surface of the cutter mount 4 in a symmetrical position of at least 180 degrees in the longitudinal direction.

The blade mount 4 is controlled to rotate by, for example, 180 degrees by a rotary drive means 6, such as a fluid pressure type or an electric type, so that the blades 4a at 180 degrees symmetrical positions are alternately used to cut the welding slag 2a. It is.

Further, each bearing 5 of the knife mount 4 is provided on the pillar 3a of the gate-shaped pedestal 3 so as to be able to move up and down, and is controlled to move up and down by a fluid pressure cylinder 7. Move the blade mount 4 up and down.

That is, by raising the blade mount 4, the cutting edge of the blade 4a is projected to the pass line of the steel piece 2, cutting the welding slag 2a, and after cutting the welding slag 2a, the blade mount 4 is lowered. , the cutting edge of the cutting tool 4a is placed below the pass line, and in order to cut the welding slag 2a on the next piece of steel 2, the rotation of the cutting tool mounting base 4 is controlled by the rotation driving means 6, and the cutting tool 4a in the symmetrical position is moved upward. Then, the blade mount 4 is raised again by the fluid pressure cylinder 7.

Although the cross-sectional shape of the cutter mount 4 may be circular, it is preferable to have a rectangular cross-section as shown in FIG. 2 in order to facilitate attachment of the cutter 4a.

Further, as shown in FIG. 3, a blade 4a is provided on each outer surface of the blade mount 4 having a square cross section in the longitudinal direction, or as shown in FIG. A cutter 4a may be provided for each.

Furthermore, each cutter 4a may be an integral piece as shown in FIG.
As shown in FIG. 6, the blade mount 4 corresponds to the width of the steel piece 2
It is better to provide each in a divided array along the longitudinal direction of the outer surface of the
This is preferable because the impact force on the cutter 4a can be reduced.

Furthermore, in order to cut and remove the cutting slag, the roller table 1 for transporting the steel billet 2 is controlled to rotate in forward and reverse directions to move the steel billet 2 back and forth, thereby cutting the bottom surface of both ends of the steel billet. In order to cut and remove the slag 2a, the knife mount 4 equipped with the knife 4a is installed symmetrically at the front and rear positions in the advancing direction of the steel piece 2 with a required distance, as shown in FIG. 7, for example. As shown in FIG. 4, by providing the blades 4b opposite to the cutting edges of the blades 4a at 180° symmetrical positions in one direction of the square cross-section blade mount 4, at 180° symmetrical positions in the other direction of the blade mount 4, one unit This is extremely preferable in terms of saving installation space and equipment costs.

In the examples shown in FIGS. 3, 4, and 7, the rotation drive means 6 of the blade mount 4 is appropriately controlled so that the desired blade 4a or 4b is projected onto the pass line. It goes without saying that the blade mount 4 should not rotate during cutting.

Furthermore, it may be possible to remove adhering slag, scale, etc. by spraying high-pressure water onto the cutter 4a or 4b that has completed cutting the slag 2a.

As mentioned above, the present invention has a roller table for conveying a steel piece cut to a predetermined length, at an arbitrary position below between the rollers.
A roll-shaped blade mount whose vertical movement and rotation are controlled is horizontally mounted perpendicular to the conveying roller table, and a blade for cutting slag for melt cutting of steel billets is installed at least in a symmetrical position in the longitudinal direction of the outer surface of the blade mount. By lowering the cutter mount and rotating the cutter that has finished cutting the cutter slag, the cutter slag, scale, etc. accumulated on the cutter mount can be dropped and removed, and the cutter can therefore be kept clean at all times. Therefore, it is possible to achieve extremely good adhesion between the cutter and the steel piece, and to completely cut off the cutting slag.

In addition, by using each cutter alternately, thermal fatigue is reduced, which contributes to extending the life of the cutter, and even if one of the cutters is damaged, the other cutter can continue cutting the fused slag. This eliminates the need to change cutters during casting, contributing to improved productivity.

Furthermore, by installing cutters with different cutting edge directions on the cutter mount, it is no longer necessary to install fusing slag removal devices symmetrically at the front and back positions in the traveling direction of the steel billet, with a required distance between them. Since this can be done with a removal device, it can contribute to saving installation space and equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic front view showing an embodiment of the device of the present invention, Figs. FIG. 6 is a plan view showing each side of the array of cutlery on the cutter mount surface, and FIG. 7 is a cross-sectional view showing an example in which cutlers with different cutting edges are installed on the cutter mount. 1...Roller table for conveying steel pieces, 2...
... Steel billet, 2a ... Cutting slag, 3 ...
・・Gate type mount, 3a・・Pillar, 4・・・・
Knife mount, 4a, 4b...Knife, 5...
... Bearing, 6 ... Rotation drive means, 7 ... Curved fluid pressure cylinder

Claims (1)

[Scope of utility model registration request] A roll-shaped cutter mount whose vertical movement and rotation are controlled is horizontally mounted below between the rollers at arbitrary positions on the roller table for conveying the steel billet cut to a predetermined length, and perpendicular to the conveying roller table. , a steel billet melt cutting slag removal device comprising a cutter for cutting steel billet melt cutting slag provided at least in a symmetrical position in the longitudinal direction of the outer surface of the cutter mount;