JPH0445770Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an apparatus for removing slag by fusing steel slabs.

``Prior art'' For example, slabs manufactured by continuous casting equipment are melt-cut into steel slabs of a predetermined length, but the melting slag generated during melt-cutting adheres to the lower surface of the ends of the steel slabs, causing so-called torch sag. It is formed.

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

Conventionally, as a means for removing the cutting slag, as described in, for example, Japanese Utility Model Application Publication No. 54-64139, there is a method for removing the cutting slag from the center of the front part to both sides of the rear part of the tool rest, which is moved up and down by a hydraulic cylinder. The blades are arranged at the required angle with respect to the traveling direction of the steel piece and at the required distance from each other, and the ends of adjacent blades are lapped together and arranged backwards, so that the protrusion level of each blade is adjusted from the center to the blades on both sides. There is a device that gradually lowers the height as you go.

However, since the blades of this device are arranged as described above, if the ends of the steel piece are warped in the width direction, the disadvantage is that the welding slag in the warped part cannot be sufficiently cut. Along with there being
When it comes into contact with a piece of steel, a large impact force is applied to the cutter, which shortens the life of the cutter.As a countermeasure, a cutter that can move up and down, as described in Japanese Utility Model Publication No. 60-39147, has been developed. On the table, there is a dog-shaped fixed tip cutter with the apex at the center of the front part on the entrance side of the steel piece, a spring-interposed cutter part that is at a required distance from the tip cutter and wraps with the tip cutter, and this cutter. A middle cutter having fixed cutter parts arranged adjacently on both sides of the spring-interposed cutter part, a spring-interposed cutter part which is arranged in the same way as the middle cutter and overlaps with the front fixed cutter part, and this spring-interposed cutter part. A steel billet fusing slag removal device has been proposed which includes a rear cutter having fixed cutter portions disposed adjacent to both sides of the cutter portion.

``Problems to be solved by the invention'' By the way, the device described in the above-mentioned Japanese Utility Model Publication No. 60-39147 cuts and removes the welding slag from the center of the lower surface of the end of the steel piece to both ends at once. However, the turret bounces due to the impact when the central part of the fused slag is removed by the tip knife, and the blades in the rear row go under the fused slag, causing the fused slag at both ends of the steel piece to be removed. There is a problem in that the cut slag remains without being removed, and in order to remove the slag on both sides, the cutting operation must be performed again, resulting in a decrease in productivity and a decrease in the life of the cutter.

It is an object of the present invention to provide a fusing slag removal device for steel billets, which is designed to solve the above-mentioned problems.

``Means for Solving the Problems'' The gist of the present invention is that the turret is installed in the process of conveying the steel billet cut to a predetermined length, and is equipped with a tool rest that can move up and down. A fusing slag removal device for steel slabs that removes slag using cutlery blades includes a dogleg-shaped tipped knife arranged only on both sides of the steel billet on the entry side, and with the apex at the center of the front end, and tipped knives on both sides. This device is for fusing and cutting slag from steel pieces, and includes a dog-shaped rear cutter with the apex at the center of the front end.

"Operation" First, the cutters on both sides remove the cutting slag on both sides of the bottom surface of the end of the steel piece, but in this case, the cutting slag collides with the cutters on both sides. The force causes the steel piece to be largely torn off from each side end toward the center, and then the ends of the steel piece are removed by a rear cutter located between the front cutters on both sides. The welding slag in the center of the lower surface is easily removed by the force of collision with the rear cutter.

``Example'' Next, an example of the apparatus for removing slag by melting a steel billet according to the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a roller table for conveying a steel billet 2 cut to a predetermined length to, for example, a hot rolling mill. A tool rest 4, which is moved up and down by a lifting means 3 using a cylinder, is installed perpendicular to the roller table 1.

As shown in FIG. 2, on both sides of the front part of the upper surface of the tool rest 4 (inlet side of the steel piece 2), the center of the front end is the apex, and the direction is preferably 5°±1° in both directions. is provided with planar dog-shaped tip blades 5 and 6 having a receding angle θ of about 5°.

On the upper surface of the tool rest 4 located at the rear between the tip cutters 5 and 6 on both sides, the center of the front part is the apex,
Further, a rear cutter 7 is provided which has a dogleg shape in plan view and has a receding angle θ of preferably about 5° in both directions.

Distance between the outer ends of the tip cutters 5 and 6 on both sides
For example, if the maximum width of the steel piece 2 is 1920 mm, L ₁ is 2100 mm, and the length (width) of each blade 5, 6, and 7.
L ₂ is, for example, L ₁ /3, or 700 mm.

Also, the distance L ₃ between the front cutters 5 and 6 and the rear cutter 7
Since the width of the cutting slag 2a is generally about 20 to 40 mm, the width may be about 100 mm. In addition, in the case of removing the welding slag, since the roller table 1 for conveying the steel slab 2 is controlled to rotate in forward and reverse directions to reciprocate the steel slab 2, the tool rest 4 equipped with the cutters 5, 6, and 7 is shall be installed symmetrically at the front and back positions in the traveling direction of the steel slab 2 with a required distance between them.

As shown in FIG. 3A, the cutting slag 2a on both sides of the lower surface of the end of the steel slab 2 is first removed by the cutters 5 and 6 on both sides. The slag 2a is removed as if being largely torn off from each side end toward the center by the force of collision with the cutting edges 5 and 6 on both sides, and then, as shown in FIG. 3B, the slag 2a is removed. By the rear cutter 7 disposed rearward between the tip cutters 5 and 6 on both sides, the welding slag 2a at the center of the lower surface of the end of the steel piece 2 is easily cut by the force of collision with the rear cutter 7. It will be removed.

"Effects of the Invention" As described above, according to the apparatus for removing fusing slag from a steel billet according to the present invention, first, the cutting slag on both sides of the lower surface of the end of the steel billet is removed by the cutting tools at both ends. Therefore, it is possible to remove the welding slag on both sides of approximately 2/3 or more of the entire width of the welding slag on the lower surface of the end of the steel billet, and then remove the welding slag in the center of the lower surface of the end of the steel billet as described above. Since it is removed by the rear cutter located between the front cutters on both sides, it is possible to remove approximately 1/3 or less of the remaining welding slag, and therefore the welding slag can be completely removed in one cutting operation. It can be removed by
It can contribute to improving productivity and reducing the unit consumption of cutlery.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the device of the present invention, FIG. 2 is a schematic plan view showing the arrangement of cutters in the tool post, and FIGS. 3A and B are views taken along arrow A-A in FIG. It is an explanatory view of the removal situation of the cutting slag. DESCRIPTION OF SYMBOLS 1... Roller table for conveying steel billet, 2... Steel billet, 2a... Cutting slag, 3... Lifting means, 4...
...Turret rest, 5, 6... Tip blades on both sides, 7...
Rear knife.

Claims (1)

[Scope of utility model registration request] A steel billet melt slag removal device is installed during the conveyance process of steel billets cut to a predetermined length, and removes the melt cut slag from the steel billets using a cutter provided on a vertically movable tool post. A dog-shaped tip blade that is arranged only on both sides and has the apex at the center of the front end, and a dog-shaped rear blade that is arranged at the rear between the tip blades on both sides and has the apex at the center of the front end. A steel billet fusing slag removal device consisting of.