JPH04283064A - Method and device for removing burr - Google Patents

Abstract

PURPOSE:To grind and remove burrs, adhered to the cut surface of a slab, on a hot charge line without forming no flaw by effecting grinding in a direction in which a grinding stone does not make direct contact with slag and performing two processes of a slag cutting and a burr removing process. CONSTITUTION:In a hot charge line for a slab 1, a burr removing device 100 is located between a gas cutter and a rolling mill. A first grinding stone 51 is regulatably engaged with and disengaged from the lower edge of the cut surface of the slab 1. In a grinding outbound process in the direction of the width of the slab, heavy grinding is made on the corner part of the lower edge of a cut surface to remove slag. In a grinding inbound process in the direction of the width of the slab of the grinding stone 51, light grinding is applied on a corner part after grinding. During removal of burrs, burrs may be further produced. In which case, burrs are removed in a way that a disc grinding stone 71 is moved following the grinding stone 51 which carries out light grinding.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method and apparatus for mechanically removing burrs remaining on the lower edge of the cut surface of a continuous cast slab after cutting it into slabs of a predetermined length. It is.

0002

2. Description of the Related Art In a conventional method for removing burrs, continuously cast slabs cut into predetermined lengths by gas cutting are stored, and slag is removed online by gas cutting. In addition, some cases have been dealt with online using a device that moves the slag-attached parts with a knife relatively along the bottom surface of the slab in the slab transport direction, bends the protruding parts, and removes them by hooking them, but it has not been possible to completely remove them. Ta. In recent years, the hot charging method has been developed, and conventional methods cannot completely remove burrs, so rolling is performed with some burrs still attached, and the slag peels off during rolling, resulting in surface flaws. It had become. The devices disclosed in Publication of Utility Model Publication No. 57-24445, Publication of Utility Model Publication No. 52-139312, Publication of Utility Model Publication No. 1029 of 1977, etc.
Although it is practical in a hot charge line, it is impossible to completely remove slag if the hot charge slab is warped in length and width.

On the other hand, in the device disclosed in Japanese Utility Model Application Publication No. 56-24549, it is difficult to attach the copying roller to the hot charge line, and even if the slag removal is performed by grinding in the direction of slag adhesion, the slag cannot be removed completely. cannot be removed. In addition, slag removal leaves scratches.

[0004] Japanese Patent Laid-Open No. 63-30207 discloses an apparatus for grinding a cast slab while automatically detecting end face adhesion sagging that occurs during cutting by melt cutting. Japanese Unexamined Patent Publication 1986-14
No. 0987 discloses a two-head grinding device for rough grinding and finish grinding in the grinding of pipes and bar materials.

[0005] When the grinder surface comes into direct contact with the slag, the slag becomes molten again, and problems such as the molten slag on the grinder whetstone surface re-attaching to the lower surface of the slab and the inability to grind are likely to occur. Furthermore, if the slab is ground only along the lower surface, the burr will protrude toward the end face of the slab, and this burr will again cause flaws.

[0006]

[Problems to be Solved by the Invention] The problem to be solved by the present invention is to completely remove the burrs remaining on the cut surface of the slab by gas cutting on a hot charge line before the rolling process, and to remove the burrs. The object of the present invention is to obtain a method and apparatus that do not leave any defects.

[0007]

[Means for Solving the Problems] The burr removal method of the present invention includes providing a burr removal device between a gas cutter and a rolling mill in a slab conveyance line, and a grinding wheel provided in the burr removal device. Adjustably engages with the lower edge of the cut surface of the slab.
The grinding wheel is capable of removing burrs by heavy grinding at the corner of the lower edge of the cut surface during the forward grinding process in the width direction of the slab, and the grinding wheel is in the return process of grinding in the width direction of the slab. The above-mentioned problem is solved by means of lightly grinding the burrs of the corner after the grinding and further lightly grinding the lightly ground corner using another disk grindstone that follows the grindstone. The burr removal device of the present invention is a burr removal device installed between a gas cutting machine and a rolling mill on a slab conveyance line. a plurality of table rollers, and a first grinding wheel installed on the cart and supporting the first grinding wheel so as to be movable up and down and back and forth.
Means comprising a pair of first grinding units and a pair of second grinding units installed on the cart and supporting a disc grindstone so as to be movable up and down in conjunction with the first grinding wheel. This solves the above problem.

[0008]

[Operation] The method of the present invention, when removing burrs such as slag and base metal attached to the lower end surface of a slab, involves two steps: grinding in a direction where the grinding wheel does not come into direct contact with the slag, and slag grinding and burr removal. The process is characterized by complete removal of burrs.

[0009] In the forward stroke of the groove grinding, the corners of the slab are heavily ground. Although the slag is removed by this grinding, new burrs are created. Therefore, light grinding is performed on the backward stroke to remove this burr. Further burrs may occur during this deburring process. Therefore, the disc grindstone is moved to follow the grindstone that is performing light grinding to remove this burr.

[0010] Therefore, the position of the grinding wheel can be adjusted for each grinding process (it can also cope with wear of the grinding wheel). Slab adhesion slag occurs in two places, the front and rear ends of the slab.
Two grinding units, one for the front and one for the rear, are arranged to simultaneously grind the rear end of the leading slab and the tip of the trailing slab, increasing grinding efficiency.

The burr removal device of the present invention is preferably installed in the conveyance path immediately after gas cutting or before loading into the heating furnace.
In cases where direct rolling is performed without using a heating furnace, a slag condition (temperature) shall be installed in front of the rolling mill to ensure that the slag condition (temperature) is suitable for removing the abrasive material.
, a suitable location such as equipment for processing removed slag (scale sluice, etc.) may be used.

0012

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 9.

First, the burr removal method of the present invention is shown in FIGS.
, 7, but in the hot charge line HL of the slab 1, the gas cutting machine GC and the rolling mill RM
A burr removal device 100 is provided between the two. The first grinding wheel 51 provided in this burr removing device 100 is made to be able to adjustably engage and separate from the lower edge of the cut surface of the slab 1. Whetstone 5
In the grinding step (G2→G4) in the width direction of the slab, the corner portion 12 of the lower edge of the cut surface is heavily ground to remove the slag 11 (FIG. 7(A)). The grindstone 51 grinds the corner 1 after grinding in the return stroke (G4→G2) in the slab width direction.
Lightly grind the burr 13 of No. 2 (FIG. 7(B)). Further burrs may occur during this deburring process. There, the disc grinding wheel 7 follows the grinding wheel 51 that is performing light grinding.
1 to remove this burr 14 (FIG. 5) (FIG. 7(B)).

As shown in FIG. 1-4, the burr removal device 100 of the present invention includes a cart 3 that can move in a direction perpendicular to the hot charge line HL, a plurality of table rollers 4 installed on the cart 3, , is installed on trolley 3, and the first
1 that supports a grinding wheel 51 so that it can be moved up and down and back and forth.
A pair of first grinding units 5a and 5b, and a pair of second grinding units that are installed on the trolley 3 and support a disc grindstone 71 so as to be movable and adjustable up and down in conjunction with the first grindstone 51. It consists of 7a and 7b.

The second grinding units 7a, 7b include a disc grindstone 71, a support arm 72, as best shown in FIG.
, a cylinder 73, and a support stand 74. The operation of the cylinder 73 causes the support arm 72 to swing up and down.

Next, the operation will be explained. As shown in FIG. 9, slag 11 remains on the lower edge of the cut surface of the slab 1 that has been gas cut on the hot charge line HL. A device 100 of the present invention is shown in FIGS. 1-4. The gas-cut slab 1 is transported by a hot charge line table 2 and stopped at a predetermined position P1 with high accuracy. The burr removing device 100 is comprised of a table roller 4 and two grinding units 5a and 5b mounted on a cart 3 that runs perpendicular to the line HL. Further, the grindstone 51 is rotated by a motor 52 through a belt 53, and can be driven up and down by cylinders 54a and 54b, and back and forth in the line direction by a cylinder 55.

The burr removal method of the present invention will be explained with reference to FIGS. 5, 6 and 7. 6 and 7 show the grindstone movement flow, and FIG. 5 shows an enlarged view of the grinding of the slab 1. Position P1 in front of trolley 3
The tip of the slab 1 that has stopped at
to the preparation position G2. At position G2, the upper and lower cylinders 54a and 54b operate to move the grindstone 51 to position G2.
11 on the lower edge of the slab.
The whetstone 51 is pressed onto. Next, the trolley 3 is further moved laterally to remove slag from position G3 to position G4. On the outward journey of the truck 3 (G2→G4), heavy grinding (Fig. 5) is performed to completely remove the slag.

[0018] When the slag is removed by heavy grinding, large burrs are generated. Therefore, at grindstone position G4, cylinder 5
After lowering the grindstone 51 from 4a and 54b, the cylinder 55
The grinding wheel 51 is advanced to position G5 by pressing Slab 1 again.
A grindstone 51 is pressed onto the lower edge of the holder, and light grinding is performed to remove burrs. On the return trip of the truck 3 (G4→G2), light grinding is performed to prevent secondary burrs from occurring.

Considering the occurrence of secondary burrs, the secondary burrs are removed by a disc grindstone 71 following the grindstone 51.

After the slab 1 has been slag-removed, the side guide 6 is released, and after passing over the table rollers 4 on the cart, the rear end of the slab 1 is again precisely stopped at a predetermined position P2 on the rear surface of the cart 3. Then, burrs are removed by the rear surface grinding unit 5b in the same manner as described above.

After deburring the leading end of the first slab, it is also possible to simultaneously grind the trailing end of the preceding slab and the leading end of the trailing slab.

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

[0023]

According to the present invention, the slag remaining on the slab can be completely removed, and no slag removal scratches remain. An example of the results of implementing the present invention is shown in FIG.

[Brief explanation of the drawing]

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

FIG. 2 is a side view taken along line II-II in FIG. 1;

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

FIG. 4 is a side view of the deburring grindstone mechanism as seen from line IV-IV in FIG. 1;

FIG. 5 is a partial cross-sectional view of the lower end of the slab showing a slab deburring procedure.

FIG. 6 is a grindstone movement path diagram showing the burr removal method of the present invention.

7 is an explanatory diagram of each outbound and return trip in FIG. 6. FIG.

FIG. 8 is a graph showing the effects of the present invention.

FIG. 9 is a perspective view showing the slab after gas cutting.

[Explanation of symbols]

1 Slab 2 Hot charge line table 3 Trolley 4 Table roller 5a, 5b First grinding unit 6 Side guide 7a, 7b Second grinding unit 51 Grinding wheel 71 Disc whetstone

Claims (2)

[Claims] Claim 1: A burr removal device is provided between a gas cutting machine and a rolling mill in a slab conveyance path, and a grinding wheel provided in the burr removal device is adjustably engaged with the lower edge of the cut surface of the slab.・The grinding wheel should be able to remove burrs by heavy grinding on the corner of the lower edge of the cut surface during the forward grinding process in the width direction of the slab, and the grinding wheel should be able to grind back in the slab width direction. A method for removing burrs, which comprises lightly grinding the burrs on the corner after the grinding in the process, and further lightly grinding the lightly ground corner with another disk grindstone following the grindstone. 2. A burr removal device installed between a gas cutting machine and a rolling mill on a slab conveyance path, comprising a cart that can move in a direction perpendicular to the conveyance path, and a plurality of deburrs installed on the cart. a pair of first grinding units which are installed on the cart and support a first grinding wheel so as to be movable up and down and back and forth, and a disc which is installed on the cart; A burr removal device comprising a pair of second grinding units supporting a grindstone so as to be movable up and down in conjunction with the first grinding wheel.