JP2674322B2 - Deburring method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mechanically removing burrs remaining on a lower edge of a cut surface of a slab after cutting a continuous cast slab into a slab having a predetermined length. It is.

[0002]

2. Description of the Related Art In a conventional method for removing burrs, a continuous cast slab cut to a predetermined length by gas cutting is stored, and slag is removed online by gas cutting.
In addition, a device was used to move the sticking part on-line along the lower surface of the slab with a blade in the slab transport direction, bending the protruding part, and hooking and removing it, but it was not possible to remove it completely. Was. In recent years, a hot charge method has been developed, and burrs cannot be completely removed by a conventional method, and rolling is performed while burrs are partially adhered. Had become. The apparatuses disclosed in Japanese Utility Model Publication No. 57-24445, Japanese Utility Model Publication No. 52-139212, Japanese Utility Model Publication No. 57-1029,
Although it can be used in a hot charge line, it is impossible to completely remove the slag if the hot charge slab has a warp and a warp.

On the other hand, in the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. Sho 56-24549, it is difficult to attach the copying roller to the hot charge line. Cannot be deleted. In addition, it leaves noro flaws.

When the grinder surface comes into direct contact with the slag, the slag is melted again and the molten slag on the grinder grindstone surface is likely to re-adhere to the bottom surface of the slab or cause troubles such as grinding failure. Further, when grinding is performed along only the lower surface, burrs project toward the slab end face side, and the burrs again cause flaws.

[0005]

The problem to be solved by the present invention is to remove completely the burrs remaining on the cut surface of the slab by the gas cutting on the hot charge line before and after the rolling process, and to remove the burrs. An object of the present invention is to provide a method and an apparatus that do not leave flaws.

[0006]

A method for removing burrs of the present invention is to provide a deburring device between a gas cutting machine and a rolling mill in a slab transfer line, and to remove a grinding wheel provided in the deburring device. The grindstone is capable of being engaged with and separated from the lower edge of the cut surface of the slab in an adjustable manner, and the grindstone grinds the corner portion of the lower edge of the cut surface in the forward stroke of the slab in the width direction to remove burrs. That is, the above problem is solved by means of the grindstone lightly grinding the burrs at the corners after the grinding in the grinding return stroke in the slab width direction.

The deburring apparatus of the present invention is a deburring apparatus installed between a gas cutting machine and a rolling mill in a slab transfer line, and a carriage that can move in a direction perpendicular to the transfer line and a top of the carriage. The above problem is solved by means of a plurality of table rollers installed on the carriage and a pair of grinding units installed on the carriage and movably supporting the grinding wheel vertically and longitudinally. There is.

[0008]

According to the method of the present invention, in grinding and removing burrs such as slag and base metal adhered to the lower end surface of the slab, grinding is performed in a direction in which the grinding wheel does not directly contact the slab. It is characterized in that burrs are completely removed by performing the process.

For this reason, the position of the grinding wheel can be adjusted for each grinding process (the abrasion of the grinding wheel can be dealt with). Since slab adhesion slags are generated at two points on the front and rear edges of the slab,
Two grinding units, one for front and one for rear, are arranged to improve grinding efficiency.

The deburring apparatus of the present invention is preferably provided immediately after gas cutting or in the transport path before charging the heating furnace.
In the case of rolling directly without using a heating furnace, etc., it should be installed in front of the rolling mill, and suitable positions such as slag condition (temperature) and processing equipment (scale sluice etc.) suitable for grinding and removal It is good.

[0011]

Embodiments of the present invention will be described with reference to FIGS.

First, the method for removing burrs of the present invention will be described with reference to FIGS.
As will be described later in detail with reference to the above, a deburring device 100 is provided in the hot charge line HL of the slab 1 between the gas cutting machine GC and the rolling machine RM. This deburring device 1
The grinding wheel 51 provided at 00 can be engaged with and separated from the lower edge of the cut surface of the slab 1 in an adjustable manner. The grindstone 51 grinds (51H) the corner portion 12 of the lower edge of the cutting surface in the grinding forward stroke (G2 → G4) in the width direction of the slab, and the slab 11
Is removed. The grindstone 51 lightly grinds (51L) the burrs 13 of the corner portions 12 after the grinding in the grinding back stroke (G4 → G2) in the slab width direction.

The deburring apparatus 100 of the present invention comprises a carriage 3 which can move in a direction perpendicular to the hot charge line HL,
A plurality of table rollers 4 installed on the dolly 3 and a pair of grinding units 5a, 5b installed on the dolly 3 and supporting a grinding wheel 51 so that it can be moved up and down and back and forth.
And made from.

Next, the operation will be described. As shown in FIG. 7, a slag 11 is left on the lower edge of the cut surface of the slab 1 gas-cut on the hot charge line HL. 1 to 4 show an apparatus 100 of the present invention. The gas-cut slab 1 is conveyed by the hot charge line table 2 and accurately stops at a predetermined position P1. The deburring apparatus 100 includes a table roller 4 and two grinding units 5a and 5b on a carriage 3 running at right angles to the line HL. The grindstone 51 is rotated by a motor 52 via a belt 53, and can be driven up and down by the cylinders 54a and 54b and back and forth in the line direction by the cylinder 55.

The burr removal method of the present invention will be described with reference to FIGS. FIG. 4 shows a grindstone movement flow, and FIG. 5 shows an enlarged view of grinding the slab 1. The tip of the slab 1 stopped at the position P1 in front of the carriage 3 is clamped by the side guide 6, then the carriage 3 traverses, and the grindstone 51 moves from the standby position G1 to the preparation position G2. At the position G2, the upper and lower cylinders 54a and 54b are operated to swing the grindstone 51 from the position G2 to the position G3 to move the grindstone 5 to the slab 11 at the lower edge.
Crimp 1 Next, the trolley 3 is further traversed, and staking is performed from the position G3 to the position G4. On the outward path (G2 → G4) of the trolley 3, heavy grinding 51H (FIG. 5) is performed in order to completely remove the slag.

When slag is removed by heavy grinding, large burrs 13 are generated as shown in FIG. Therefore, the grindstone position G
4, after lowering the grindstone 51 from the cylinders 54a and 54b, the grindstone 51 is advanced to the position G5 by the cylinder 55, and the grindstone 51 is pressure-bonded to the lower edge of the slab 1 again.
Perform 51 L (FIG. 5) of light grinding for removing burrs. On the return path (G4 → G2) of the carriage 3, light grinding is performed so that secondary burrs do not occur.

After the removal of the slab 1 is completed, the slab 1 releases the side guide 6 and passes over the table roller 4 on the dolly, and then the rear end of the slab 1 is again accurately stopped at a predetermined position P2 on the rear surface of the dolly 3. Then, similarly to the above, the burr removal is performed by the rear surface grinding unit 5b.

The slab from which the burrs at the front and rear ends have been removed is conveyed to the heating furnace or rolling mill by the rear surface line table 2.

Next, specific examples of the present invention will be described.

(1) Slab dimensions Thickness 235 mm x Width 2250 m x Length 4000 mm (2) Grinding conditions Grinding wheel Diameter 500 mm x Width 70 mm Peripheral speed 3800 m / min Forward stroke (first pass) Heavy grinding 30 mm chamfering at an angle of 45 degrees Motor load 85A Crimping force 450kgf Return stroke (2nd pass) Light grinding 10 × 5mm chamfer at 30 degree angle Motor load 40A Crimping force 150kgf (3) Grinding results Shown in FIG. In FIG. 6, (a) shows a conventional method in which the slag is removed by a bite (moving in the longitudinal direction of the slab). (B)
Is a comparative example in which only the first pass of the method of the present invention was carried out.
(C) is the method of the present invention.

In (a), a slag removing flaw having a depth of about 5 mm remains, and the slag partially remains. In (b), a slag removing flaw having a depth of about 5 mm remains, but the slag remaining is halved.
In (c), no slag or flaw remains.

[0022]

According to the present invention, slag remaining on the slab is completely removed, and no slag removal flaw is left.

[Brief description of the drawings]

FIG. 1 is a plan view of a burr removing device of the present invention.

FIG. 2 is a side view taken along line II-II in FIG.

FIG. 3 is a front view taken along line III-III in FIG. 1;

FIG. 4 is a grindstone moving path diagram showing a burr removal method of the present invention.

FIG. 5 is a partial side view of FIG. 4;

FIG. 6 is a graph showing the effect of the present invention.

FIG. 7 is an inclined view showing the slab after gas cutting.

[Explanation of symbols]

 1 Slab 2 Hot charge line table 3 Cart 4 Table roller 5a, 5b Grinding unit 6 Side guide 11 Noro 13 Carry 51 Grinding wheel HL Hot charge line 51H Heavy grind 51L Light grind

Claims (2)

(57) [Claims] 1. A deburring device is provided between a gas cutting machine and a rolling mill in a slab conveyance path, and a grinding wheel provided in the deburring device is adjustably engaged with a lower edge of a cutting surface of the slab.・ To allow separation, the grindstone grinds the corners of the lower edge of the cutting surface in a grinding stroke in the width direction of the slab to remove burrs, and the grindstone grinds back in the slab width direction. A burr removing method comprising lightly grinding the corner burrs after the grinding in the process. 2. A deburring device installed between a gas cutting machine and a rolling mill in a slab conveyance path, a trolley movable in a direction perpendicular to the conveyance path, and a plurality of trolleys installed on the trolley. Table roller, and is installed on the trolley,
A deburring device consisting of a pair of grinding units that support the grinding wheel so that it can be moved up and down and back and forth.