JPH08141714A - Device for removing burr of slab top - Google Patents

Abstract

PURPOSE: To surely cut and remove the burr of a slab top caused by gas cut-off and to instantially cut and remove the burr during carrying the slab without stopping the slab carrying, in the carrying line of the continuous cast slab. CONSTITUTION: On a bite base 3 vertically shakable while using the front side in the advancing direction of the slab between carrying rolls R in the slab carrying line, the bites 4 having a cutting bite 6 part cut deep into the burr B at the lower surface of the slab top and side bite 7 parts retreated and inclined toward the advancing direction of the slab, are arranged. The bite base 3 is depressed to the lower surface of the slab with an air cylinder 5 and the burr B at the lower surface of the slab top is surely cut and removed during carrying the slab, and after removing, the cut burr is apart from the lower surface of the slab so as not to damage the lower surface of the slab.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring device for mechanically removing burrs generated on the lower surface of the top of a gas-cut slab in a slab transfer line such as a continuous casting facility.

[0002]

2. Description of the Related Art In a continuous casting facility for slabs, continuously produced slabs are cut into slabs of a predetermined length by a cutting machine, and when melted by a gas cutting machine, the lower part of the cut surface is cut. Burr is generated. This burr can be removed in the slab maintenance process, but if the slab is rolled without any maintenance in recent years or by direct rolling that supplies it to the rolling process with some heating, it will damage the rolling roll if it is rolled with burrs attached. And problems such as surface defects of the product may occur.

For this reason, a deburring device for mechanically removing a burr generated on the lower surfaces of the top and bottom of the melted slab with a cutting tool is installed on the slab transfer line of the continuous casting facility. As a conventional deburring device of this type, there is the following device.

(I) General deburring device for slab top and slab bottom As shown in FIG.
The slab top deburring device 50 and the slab bottom deburring device 51 that can move the bite 52 extending in the width direction of the slab up and down and move in the slab conveyance direction are installed, and the slab S that has been conveyed is temporarily stopped. Let the byte 5
2 is moved from the inner side of the lower surface of the slab S toward the slab end surface, and the burr B on the slab top or the slab bottom is removed by cutting.

(II) Deburring device for slab top (Japanese Utility Model Publication No. 57-1029) As shown in FIG.
Is a slab stopper 61 in which the stopper plate 61a is urged by a spring 61b, an installation table 62 installed in front of the slab stopper 61, and an installation table 62.
A removal plate 64, one end of which is pivotally attached to the removal plate 64 and is urged up by a spring 63.
Tool 6 at the tip of the removal plate 64 when pushed back by a
The burr B is removed by cutting at 4a. Such a slab top deburring device 60 is installed at the end of the slab transfer line of the continuous casting equipment, and the slab bottom deburring device 51 of (I) is installed in another transfer line arranged at the rear stage side. Become.

[0006]

However, the conventional deburring device (I) for moving the cutting tool up and down has the following problems.

Since the cutting tool 52 is entirely in contact with the burr B and cuts, the cutting tool is heavily worn, and the burr may not be completely removed. Burrs that could not be removed must be removed manually, which is time-consuming and reduces production efficiency.

As shown in FIG. 7A, since the slab is temporarily stopped and the cutting tool is moved, the transport efficiency is poor and the production efficiency is reduced.

Further, the conventional deburring device (II) using a slab stopper and a removal plate with a cutting tool also has the following problems.

Since a spring is used for the mechanism that pushes up the removal plate with the cutting tool, the pushing force (elastic force)
Of the burr cannot be completely removed.

As shown in FIG. 8B, the slab S must be returned once to remove the burrs on the slab top, and after deburring, the slab must be laterally fed to a subsequent transport line by a pusher or the like, which improves the transport efficiency. Is bad, and the production efficiency is reduced.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to reliably cut and remove burrs on a slab top and to instantaneously remove the slab during transportation without stopping the slab. It is to provide a deburring device for a slab top that can be used.

[0013]

As shown in FIG. 1, a deburring device for a slab top according to the present invention is a deburring device for removing burrs B formed on the lower surface of the top of a gas-cut slab S. The bite table 3 installed so as to be movable back and forth with respect to the lower surface of the slab by a structure in which it is swingably supported between the transfer rolls R of the slab transfer line in the vertical direction with the front side in the slab traveling direction as a fulcrum. When,
The cutting tool 6 is provided on the upper surface of the cutting tool table 3 and has a cutting tool 6 part for cutting into the burr B on the lower surface of the slab top and a cutting tool 4 having a side bite 7 part which recedes and tilts in the traveling direction of the slab. It is characterized by being provided with actuators such as an air cylinder 5 and a hydraulic cylinder that are pressed against each other and separated from the lower surface of the slab.

[0014]

With the above-mentioned structure, as shown in FIG. 4, when the tool bit 3 is lifted by the actuator so that the tool bit 4 is pressed against the lower surface of the slab. The cutting tool 6 part bites into the burr B by the pushing force of the actuator to make a cut, and then the side bite 7 part expands the cut, and the contact part with the burr B sequentially moves toward the outer side in the slab width direction. B is removed by cutting. Then, when the cutting and removal of the burr B is completed, the tool base 3 is immediately retracted from the lower surface of the slab by the actuator and separated.

Since the cutting tool 4 consisting of the cutting tool 6 and the side tool 7 is pressed against the lower surface of the slab, the burr B can be instantly removed without stopping the conveyance of the slab S, and the pressing force is applied by the actuator. The burr B can be surely cut and removed without lowering. Further, the cutting bite 6 part can be provided with an appropriate biting angle, which makes it easier to bite into the burr B, and then the side bite 7 part comes into point contact with the burr B and the burr is gradually cut, and the slab is conveyed. The burr B can be surely removed therein, and the wear of the cutting tool 4 can be significantly reduced. Further, after the burr is removed, the cutting tool 4 is immediately separated from the lower surface of the slab and retracts until the slab S completely passes, so that the lower surface of the slab is not scratched.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an illustrated embodiment. 1, FIG. 2 and FIG. 3 are a perspective view, a side view and a plan view of the deburring device according to the present invention.
The deburring state by the deburring device is shown in order.

As shown in FIGS. 1 to 3, the deburring device 1 of the present invention is installed between the slab transfer rolls R in the slab S transfer line. The deburring device 1 mainly includes a bite base 3 installed on a base mount 2 so as to be vertically swingable, and a bite 4 mounted on the bite base 3.
It is composed of a pair of air cylinders 5 for tilting the bite base 3 in the vertical direction.

The bite base 3 has a substantially wing shape that is directed toward the downstream side (front side) in the slab advancing direction in a plan view, and the supporting member 10 is vertically hung downward at the center of the slab width direction on the downstream side in the slab advancing direction. Then, the lower end of the support member 10 is attached to the upper end of the fulcrum member 11 projecting on the base frame 2 and the fulcrum pin 12 is provided.
It can be mounted vertically and can be swung vertically. The support member 10 and the fulcrum member 11 are set so that a gap of about 5 to 10 mm is formed between the upper surface of the cutting tool 4 and the lower surface of the slab S (roll upper surface pass line) when the cutting tool base 3 is horizontal. The height can be adjusted by the shim 13 shown in FIG.

The air cylinders 5 are arranged in a pair below the upstream side (front side) of the bite table 3 in the slab advancing direction with a space in the slab width direction. This air cylinder 5 is supported by the base pedestal 2 as a center trunnion type,
The tip of the piston rod 5a is attached to the lower surface of the bite table 3 by a pin, and the extension of the piston rod 5a causes the bite 4 to slab-top with the bite 3 being tilted at a downward slope with respect to the advancing slab S. It can be pressed against the burr B on the lower surface, and can be separated from the lower surface of the slab in parallel by retracting the piston rod 5a.

In the air cylinder 5, as shown in FIG.
A generally used control circuit provided with a speed control valve 20, an electromagnetic switching valve 21 and the like is provided.
The pressing force F of 9.6 × 10 ³ N (2.0 tons) is obtained.

The cutting tool 4 is located at the central portion of the slab width direction and cuts into the burr B, and the side cutting tool 7 is V-shaped in plan view and recedes at an inclination angle α toward the upstream side in the slab traveling direction. It consists of. Each byte 6,
7 is an alloy tool steel (SKD), which is detachably inserted into a bite mounting groove formed on the upper surface of the bite base 3, and the side bite 7 is reinforced by a backup plate 14 with a rib arranged at the rear side, and a mounting plate. Secure with 15 and bolt 16 (see FIG. 1). The width of the cutting tool 4 is set to be larger than the maximum width of the slab.

As shown in FIG. 5, a cutting tool 6
Is a general bite shape or a triangular pyramid shape having a cutting edge along the slab advancing direction at the upper part, and a downward inclination angle β is attached toward the downstream side in the slab advancing direction. The biting angle β ′ into B is obtained. This biting angle β'is determined by the air cylinder 5
The stroke can be controlled by controlling the stroke, etc., and is appropriately adjusted depending on the steel type of the slab. In the case of ordinary steel, it is preferable to set it to around 16 °. The side bite 7
Is a general bite shape having a clearance angle γ on the rear side,
The inclination angle α with respect to the slab width direction is preferably about 11 to 12 °.

On the upstream side of the side bite 7 in the slab advancing direction, a pair of touch rollers 8 are arranged at intervals in the slab width direction. This touch roller 8 is a bite table 3
The slab S moves in parallel to the cutting tool base 3 by supporting the lower surface of the slab top at the same level as the upper surface of the cutting tool 4 while supporting it rotatably by a bearing while accommodating it in the notch. It can be so.

With the above construction, as shown in FIG. 6, the deburring device 1 for the slab top was installed in the middle of the slab carrying line, and the deburring of the slab top was performed as shown below. The deburring of the slab bottom is performed by a conventional method by installing a slab bottom deburring device 51 similar to the conventional one after the deburring device 1 of the slab top.

(1) The cut slab S has a deburring device 1
Before approaching the installation position, the piston rod 5a of the air cylinder 5 is extended and the bite table 3 is tilted downward with respect to the entering slab S. In this state, the cutting tool 6 is inclined and arranged at the biting angle β ′.

(2) When the top of the slab S passes in this state, the cutting tool 6 and the side tool 7 completely cut and remove the burr B of the slab top during conveyance of the slab (see FIG. 4). At the time of this deburring, the bite base 3 is pushed downward by the action of the air cylinder 5, and a moderate and sufficient pushing force is obtained upward.

(3) The complete removal of the burr B on the slab top is detected by the contact of the slab top with the touch roller 8, the slab top detection by a photoelectric sensor, a timer, etc., and the piston rod of the air cylinder 5 is detected. 5a
To retract the bite base 3 instantaneously downward so that the bite 4 does not scratch the lower surface of the slab. Further, by retracting, the influence of the slab radiant heat on the bearing portion and the like of the touch roller 8 can be reduced.

(4) When the slab completely passes over the bite 4, the bottom of the slab S is detected and the bite base 3 is moved to (1).
Return to the state of. The above is repeated to deburr the slabs S that are successively conveyed.

The biting angle β'of the cutting tool 6 is set to about 16 °, and the pushing force F of the air cylinder 5 is set to 2.
When deburring was performed with 0 ton (× 2), the conventional burr removal rate was 88%, but in the present invention, it was 98 to 99%.
Greatly improved. Further, when deburring a conventional slab top, the slab transportation was stopped for about 30 to 40 seconds, but in the present invention, the slab does not stop.

By using an air cylinder for the actuator, the lifting and lowering operation of the tool bar can be performed instantaneously,
Moreover, although there is an advantage that the load from above can be buffered by the compressibility of air, a hydraulic cylinder may be used for the actuator, and it is also possible to use a spring and an air cylinder together. In the latter case, an upward pressing force is obtained with a spring, and the air pressure of the air cylinder is used as a backup, and the air cylinder is used for lowering the bite table.

[0031]

As described above, according to the present invention, the bite base including the cutting bite part and the side bite part is pressed against the lower surface of the slab by the actuator, so that the following effects can be obtained.

(1) Burrs on the slab top can be instantly removed without stopping the slab transportation, and the slab transportation efficiency can be improved and the production efficiency can be improved.

(2) Since the tool holder is pressed against the lower surface of the slab by the actuator, the burr can be surely cut and removed without lowering the pressing force.

(3) After removing the burrs, the actuator can immediately retract the cutting tool downward so that the bottom surface of the slab is not scratched.

(4) Since the cutting bite portion has an appropriate biting angle, it easily bites into the burr,
After that, the side bite part comes into point contact with the burr and the burr is gradually cut, so that the burr can be reliably removed during the transportation of the slab, and the wear of the bite can be greatly reduced, which is stable for a long time. Can be used.

(5) The biting angle of the cutting bite part can be changed, and it can be applied to all kinds of steel.

[Brief description of drawings]

FIG. 1 is a perspective view showing a deburring device for a slab top according to the present invention.

FIG. 2 is a side view of the deburring device of FIG.

3 is a plan view of the deburring device of FIG. 1. FIG.

FIG. 4A is a schematic side view and FIG. 4B is a schematic bottom view showing the deburring state of the present invention in order.

FIG. 5 is a cutting tool according to the present invention, in which (a) is an overall plan view, (b) is a side view of a cutting tool, (c) is a front view of the cutting tool, and (d) is a sectional view of a side tool. .

FIG. 6 is a schematic plan view showing a slab transfer line according to the present invention.

FIG. 7A is a schematic plan view showing a conventional general slab transfer line, and FIG. 7B is a schematic side view showing a deburring device thereof.

FIG. 8A is a vertical sectional view showing a deburring device using a conventional slab stopper and a removal plate with a bite, and FIG. 8B is a schematic plan view showing the slab transfer line.

[Explanation of symbols]

 S ... Slab B ... Burr R ... Slab transport roll 1 ... Deburring device 2 ... Base stand 3 ... Bit stand 4 ... Bit 5 ... Air cylinder 6 ... Cutting bit 7 ... Side bit 8 ... Touch roller 10 ... Support member 11 ... Support point Member 12 ... Support pin 13 ... Shim 14 ... Backup plate 15 ... Mounting plate 16 ... Bolt

Claims (1)

[Claims] 1. A deburring device for removing burrs generated on the lower surface of the top of a gas-cut slab, the bit being installed between transfer rolls of a slab transfer line so as to be movable back and forth with respect to the lower surface of the slab. Table, a bite installed on the upper surface of this tool table, having a cutting tool part that cuts into the burr on the bottom surface of the slab top, and a side bite part that recedes and slopes in the slab advancing direction, and presses the tool table against the bottom surface of the slab. And a deburring device for a slab top, which is equipped with an actuator for separating it from the lower surface of the slab.