JP5410268B2 - Slab deburring device - Google Patents

Description

The present invention relates to a slab deburring device. More specifically, the present invention relates to a deburring device that removes burrs generated by cutting when a slab continuously cast in a continuous casting facility is cut to a predetermined length.
As the slab continuously cast becomes higher speed casting, the slab temperature rises and the ratio of remaining burrs increases, so the product loss in the rolling process increases and the yield deteriorates. However, if the casting speed is lowered to suppress the generation of burrs, the production volume will not increase. The present invention relates to a deburring apparatus that removes burrs that greatly affect productivity in this way before entering the rolling process.

There are various types of slabs cast in a continuous casting facility, such as large slabs and blooms and small billets.
In slabs and blooms with a large slab size, the slab is often cut by gas. For this reason, the amount of burrs is large, and the deburring device uses a hammer method, a peristaltic blade method, etc. (Patent Documents 1 to 4).

  All of these conventional techniques are methods for removing burrs adhering to the lower surface of the slab, but when gas cutting is performed with a torch, burrs (especially sagging due to gas fusing) concentrate on the lower side of the slab. Therefore, there is no particular problem with the method of scraping the lower surface with a hammer or a blade.

By the way, billets with a small slab size are subjected to high-speed casting from the viewpoint of productivity and product conditions. Since short cutting is important, a hydraulic shear (cutlery shear) is not used, which requires time-consuming gas cutting. Machine)).
This hydraulic shear is cut by two upper and lower blades, and depending on the temperature of the slab, cutting sag and surface nose often remain on the cut surface and the lower surface. In this case, there are many examples in which these burrs are bitten into product ridges (eg, scabs) when rolled directly after billet transport or after reheating.

  FIG. 8 shows a prior art that does not include a deburring device. The slab C drawn out from a continuous casting facility (not shown) is conveyed by the subsequent roller table 110 via the tilting roller table 101. A guillotine type hydraulic shear 100 is arranged on the entrance side of the tilting roller table 101. Since the tilting table 101 needs to be inclined in accordance with the descending operation of the slab C cut by the lowering of the upper blade of the hydraulic shear 100, the rear end is supported by the pin 104 and the front end is supported by the cylinder 105. Yes. The cutting with the hydraulic shear 100 is due to guillotine type shear (guillotine type), so that no fusing sag occurs. There are many cases where burr to the corner occurs.

  In this specification, cutting sagging, surface cutting, residual burrs, burr and the like are collectively referred to as “burrs”. In the drawing, the burr on the cut surface is denoted by reference numeral b1, and the burr on the lower surface of the slab is denoted by reference numeral b2. Moreover, a cut surface and the slab lower surface following it are called cutting parts.

  As described above, the burr generating element when the billet slab is cut is that the gap between the blades in the hydraulic shear 100 is increased, the sharpness is deteriorated, and the slab temperature is high (900 ° C or higher). For example, burrs may adhere to both the surface and the bottom surface.

The burrs generated in the billet slabs as described above are too small, the generation positions differ among individual slabs, or adhere to the cut surface itself. In the method of scraping off the burrs protruding from the bottom surface of the slab, burrs adhering to the cut surface of the slab cannot be removed.
For this reason, an apparatus for removing burrs peculiar to billet cast pieces is desired.

JP-A-10-156498 JP-A-11-254111 JP 2000-52007 A JP 2001-205404 A

  An object of this invention is to provide the deburring apparatus which can remove the burr | flash adhering to the slab cut surface and its lower side in view of the said situation. Another object of the present invention is to provide a deburring device that can perform a deburring operation smoothly and efficiently.

The deburring device for a slab of the first invention is a deburring device that removes burrs generated in a cut portion of a long slab, and a deburring roller that removes burrs of a slab that is sent on a transport table; A motor that rotationally drives the deburring roller, a deburring head that includes the deburring roller and a mounting base that supports the motor, and a swing that pivotally supports the deburring head to rotate along an arcuate locus. It comprises a mechanism and urging means for urging and pressing the deburring roller on the deburring head against the cut portion of the slab with a desired contact pressure.
The slab deburring device according to a second aspect of the present invention is the slab deburring device according to the first aspect of the present invention, wherein the swing mechanism includes a pin that rotatably supports the deburring head with respect to a fixed member, and a swing mounted on the deburring head. The urging means comprises a rocking cylinder, and the rocking cylinder tilts the deburring head to bring the deburring roller into contact with the cut surface and the lower surface of the slab being conveyed. It is characterized by being able to.
The slab deburring device according to a third aspect of the present invention is the slab deburring device according to the first aspect, wherein the swing cylinder is a hydraulic cylinder, and a hydraulic oil supply / discharge circuit is connected to the hydraulic cylinder. Is provided with a pressure control unit that adjusts the pressure to generate a pressing pressure necessary to sequentially press the deburring roller against the cut surface and the lower surface of the slab being conveyed.

According to the first invention, if the deburring roller on the deburring head is rotated when the slab is fed on the conveying table, the deburring roller is moved while the slab moves while pushing the deburring roller. Makes contact with the cut surface and the lower surface of the slab with a necessary pressing force, so that the burrs at the slab cut portion can be removed.
According to the second aspect of the invention, the deburring roller rotates downward along the arcuate locus so that the operation is performed smoothly and is not likely to fail, and the deburring roller is smoothly moved from the cut surface to the lower surface of the slab. Since it contacts while moving, the burr | flash which follows the slab lower surface from the cut surface of a slab can be removed completely.
According to the third invention, while the deburring roller for removing the burr on the cut surface of the slab is pushed by the slab and moves in the slab conveying direction, the swing cylinder is adjusted by the pressure control unit. Since the deburring roller is pressed with an appropriate pressing force, the burrs can be surely removed.

It is a side view of the deburring apparatus A which concerns on one Embodiment of this invention. It is a front view of the deburring apparatus A of FIG. It is a hydraulic circuit diagram of a rocking cylinder. It is operation explanatory drawing at the time of separation of a rocking cylinder. (I)-(V) figure is explanatory drawing of a deburring operation | work. FIG. A is a diagram for explaining the deburring operation of the slab cut surface, and FIG. B is a diagram for explaining the state of the deburring device A. FIG. FIG. A is a diagram for explaining the deburring operation on the bottom surface of the slab, and FIG. B is a diagram for explaining the state of the deburring device A. It is explanatory drawing of the problem of the conventional slab conveyance equipment.

Next, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 101 denotes a tilting table which is a kind of a transport table, and the deburring apparatus A according to the present invention is provided by partially cutting the tilting table 101. In addition, you may install between the tilting table 101 and the roller table 110 similarly to FIG.
The slab C to be deburred according to the present invention is typically a small billet, but any slab can be used as long as the slab C is guillotine cut by the hydraulic shear 100 (see FIG. 8). It can also be applied to.
The tilting table 101 is provided with a large number of rollers 102 for conveying the slab C, as in the known table, and each roller 102 is provided with a pulley 103 for driving it through a shaft. Yes.

  1 and 2, reference numeral 1 denotes a deburring head, which includes a roller mounting base 11 and a motor mounting base 13, and an inclined base 12 is provided at the upper end of the roller mounting base 11. The deburring roller 2 is rotatably supported on the base 12. That is, the deburring roller 2 is a roller in which a plurality of rollers 22 are inserted into a shaft 21 and fixed with a key or the like, and both ends of the shaft 21 are supported by bearings 23 and fixed on the pedestal 12. Each roller 22 has irregularities on its outer periphery and is made of a tool steel or the like having high hardness. In addition, about the roller 22, it is not restricted to said structure, A grindstone type and a various thing can be especially used without a restriction | limiting.

  The motor 3 is attached to the motor mount 13. A timing belt 32 is wound around a pulley 31 attached to the main shaft of the motor 3 and a pulley 24 attached to the shaft 21 of the deburring roller 2. Therefore, when the motor 3 rotates, the deburring rotor 2 rotates, and the burrs of the slab C can be hit or rubbed to be removed.

As long as the deburring roller 2 can be rotated, various motors such as a general-purpose motor may be used as the motor 3 without particular limitation, but an inverter motor is particularly preferable. In the case of an inverter motor, forward and reverse rotation direction conversion is possible, and the number of rotations can be increased and decreased, and the control can be easily realized by using an inverter control device.
When the motor 3 is rotated in the forward and reverse directions and the rotational speed is increased or decreased in this way, the deburring roller 2 can be rotated in the forward and reverse directions and the rotational speed can be increased or decreased. It is possible to realize a deburring operation that can appropriately remove burrs depending on the size.

Next, the swing mechanism will be described.
A bracket 15 is attached to the side portion of the deburring head 1. On the other hand, a bracket 91 is also attached to the reinforcing frame 90 in a portion where the tilting table 101 is cut out, and the support shaft 16 is inserted into both the brackets 15 and 91. For this reason, the deburring head 1 rotates around the support shaft 16, and the rotation locus of the deburring roller 2 at that time is an arc.

A swing lever 17 is attached below the deburring head 1, and a swing cylinder 4 is attached to the base portion of the fixed frame 90.
The swing cylinder 4 is attached to the fixed frame 90 so as to be tiltable with a trunnion 45, and the piston rod 41 of the swing cylinder 4 is pivotally supported by a lower end of the swing frame 17 with a pin 46.

The operation circuit of the swing cylinder 4 will be described with reference to FIGS.
The swing cylinder 4 is a hydraulic cylinder, and has a rod-side oil chamber 43 and a piston-side oil chamber 44 before and after the piston 42 inside the cylinder. A first oil passage 51 is connected to the rod side oil chamber 43, and a second oil passage 52 is connected to the piston side oil chamber 44. On the other hand, a supply passage 53 from the hydraulic pump 50 is connected to the first oil passage 51 and the second oil passage 52. A return path 54 is connected between the second oil path and the tank 55. A proportional electromagnetic relief valve 56 is interposed in the first oil passage 51, and a direction control valve 57 is interposed between the second oil passage 52, the supply passage 53, and the return passage 54.

A proportional electromagnetic relief valve 56 is interposed in the first oil passage 51, and the control pressure of the proportional electromagnetic relief valve 56 can be variably controlled by a controller 59 built in the control panel. Yes. The proportional electromagnetic relief valve 56 and the controller 59 constitute a pressure control unit 60 as defined in the claims. In this embodiment, the pressure control unit 60 sets three set pressures of the proportional electromagnetic relief valve 56: P1 (19 kg / cm ² ), P2 (20 kg / cm ² ), and P3 (21 kg / cm ² ). And it can be changed sequentially.

  The proportional electromagnetic relief valve 56 is in a position where both the return oil from the piston-side oil chamber 44 of the swing cylinder 4 and the supply oil of the hydraulic pump 50 flow, and both hydraulic fluids flow into the interior. There are two internal oil passages through which the hydraulic oil passes, and the internal oil passages are connected to the return passage 54 by an external oil passage 58.

  The direction control valve 57 is an electromagnetically driven 4-port 2-position control valve, which is in the I position when the solenoid is excited and is in the II position when the solenoid is demagnetized and the spring is energized. This direction control valve 57 controls the swinging direction of the deburring head 1 by the swinging cylinder 4 to be changed.

  As shown in FIG. 3, when the directional control valve 57 is energized, the piston side oil chamber 44 of the oscillating cylinder 4 communicates with the tank 55 via the second oil passage 52, and the rod side oil chamber. 43 is supplied with hydraulic oil from a pump 50 through a supply passage 53 and a first oil passage 51. The pressure of the hydraulic oil is one of P1, P2, and P3 selected by the pressure control unit 60 when passing through the proportional electromagnetic relief valve 56, and the deburring head 1 is counteracted by each pressure. It can be rotated clockwise, that is, in the pressing direction.

  When the directional control valve 57 is in the demagnetized II position as shown in FIG. 4, the hydraulic oil from the pump 50 passes through the supply passage 53 and the second oil passage 52, and the piston side oil chamber 44 of the swing cylinder 4. The hydraulic oil in the piston-side oil chamber 44 enters the proportional electromagnetic relief valve 56 through the first oil passage 51. In this proportional electromagnetic relief valve 56, both the return oil from the rod side oil chamber 43 and the supply oil from the pump 50 flow in, but the hydraulic oil flows from the internal oil passage in the valve to the external oil passage 58. Then, it is sent to the return path 54. At this time, since the piston side pressure receiving area of the piston 42 of the swing cylinder 4 is larger than the rod side pressure receiving area, the piston 42 tries to move forward. Further, a clockwise moment due to the weight of the deburring head 1 is also added. For this reason, the piston rod 41 of the swing cylinder 4 extends, and the deburring head 1 rotates in the clockwise direction.

In this embodiment, since the deburring head 1 tends to rotate downward due to its own weight, the piston rod 41 of the rocking cylinder 4 is urged to always extend. In this embodiment, when the hydraulic oil pressure in the rod-side oil chamber 43 is 16 kg / cm ² , the balance with the weight of the deburring head 1 is maintained, and the piston rod 41 is maintained in a stopped state. Accordingly, when the pressure of the hydraulic oil supplied to the rod side oil chamber 43 of the swing cylinder 4 is made higher than the pressure at the time of balancing (16 kg / cm ² ), the piston rod 41 is retracted and the deburring roller 2 is moved to the slab side. When pressed and the hydraulic oil pressure is lowered, the piston rod 41 is extended by the weight of the deburring head 1 and the deburring roller 2 is separated from the slab.

The set pressures P1 to P3 described above are set higher than the balance pressure, and have the following technical significance.
P1: The deburring roller 2 hits the slab C, and the burr b1 on the cut surface can be removed.
P2: The deburring roller 2 hits the slab C, the pressing force is stronger than P1, and the deburring of the corner portion from the cut surface to the lower surface of the slab can be removed.
P3: The deburring roller 2 hits the slab C, the pressing force is higher than P2, and the burr b2 on the lower surface of the slab can be removed.

Next, the deburring operation of the deburring apparatus A in the present embodiment will be described with reference to FIGS.
FIG. 5 shows steps I to V of the deburring operation.

Process I is a state in which the deburring roller 2 hits the cut surface of the slab C, and from here to the process II, an operation of scraping off the burr b1 on the cut surface is performed. That is, as the slab C advances, the deburring roller 2 rotates downward along the arcuate locus, and the deburring roller 2 rotates to drop the burr b1.
In the hydraulic circuit of the oscillating cylinder 4, as shown in FIG. 3, the directional control valve 57 is switched to the I position, and the deburring roller 2 presses the cut surface of the slab C.

  From the end of the II process to the III process, as the slab C further advances, the deburring roller 2 rotates downward, and the deburring roller 2 starts from the lower end of the cut surface of the slab C. It moves while keeping the contact state to the lower surface of C. Of course, the deburring roller 2 scrapes off the burr b1 and burr b2 during this time.

In the IV process, the deburring roller 2 comes into contact with the lower surface of the slab C, and the lower surface burr b2 is scraped off following the III process.
In the steps so far, the directional control valve 57 remains in the I position, and the deburring roller 2 presses the cut portion of the slab C.
When all the deburring is completed, the deburring roller 2 moves further downward as shown in the step V, and the deburring roller 2 is separated from the slab C.
This operation is performed by switching the direction control valve 57 to the II position as shown in FIG.

FIG. 6 shows the operation of the deburring apparatus A in steps I to II in FIG. During this time, the pressing force of the deburring roller 2 against the slab C is P1 (see FIG. 5), for example, 19 kg / cm ^{2 is} set.
For this reason, when the slab C moves forward, the deburring roller 2 rotates downward along the arcuate locus while maintaining a state in contact with the cut surface of the slab C, and the piston rod 41 of the swing cylinder 4 is pulled out. It will be.
During this time, since the deburring roller 2 is rotated by the motor 3, the burr b1 on the cut surface of the slab C is scraped off.

  During the steps II to III in FIG. 5, the pressing force changes to P2, and is set to be stronger than the pressing force P1 in the steps I to II. For this reason, even when moving from the lower end edge of the cut surface of the slab C to the lower surface, contact that can remove the burrs b1 and b2 is obtained.

FIG. 7 shows the operation of the deburring apparatus A in steps III to IV in FIG. The pressing force during this time is P3, and is set so that the strongest contact force can be obtained.
When proceeding from step III to step IV, the slab advance distance increases, the deburring roller 2 swings downward, and the deburring roller 2 contacts the lower surface of the slab C upward. A large contact force is required to scrape the burr b2 by making an upward contact, but since the pressing force P3 at this time is strong, the burr b2 can be scraped off sufficiently.

As shown in step V of FIG. 5, when the deburring roller 2 is separated from the lower surface of the slab C, the slab C is not subjected to any resistance and is conveyed toward the back of the tilting table 101 (not shown). Is done.
Then, after the rear end of the slab C has passed, when the swing cylinder 4 is contracted by the set pressure at the time of pushing back, the deburring head 1 is pushed back to the original state, that is, the position shown in FIG.

  As described above, according to this embodiment, since it can be sent to the subsequent process in a state where the burrs of the slab C are completely removed, no product defects are generated. Therefore, the casting speed of the continuous casting equipment can be increased, and productivity can be maintained high. Moreover, since deburring can be performed while the slab C is being conveyed, this point can also contribute to the improvement of productivity.

In the above-described embodiment, the deburring device A is installed in the middle of the tilting roller table 101. However, it may be arranged on the entry side or the exit side of the tilting roller table 101.
Further, it may be installed on a conveyance table downstream of the tilting roller table 101. That is, the deburring device A may be installed on the entry side or exit side of the roller table 110 that is one of the downstream conveyance tables.
In these installation examples, the same effects as in the above embodiment can be exhibited.

DESCRIPTION OF SYMBOLS 1 Deburring head 2 Deburring roller 3 Motor 4 Oscillating cylinder 56 Proportional electromagnetic relief valve 57 Directional control valve 59 Controller 60 Pressure control part

Claims (3)

A deburring device that removes burrs generated in the cut part of a long slab,
A deburring roller that removes burrs from the slab that is sent on the conveying table, a motor that rotationally drives the deburring roller, and a deburring head that includes the deburring roller and a mounting base that supports the motor;
A swing mechanism that pivotally supports the deburring head to rotate along an arcuate locus;
A deburring device for a slab comprising urging means for urging and pressing a deburring roller on the deburring head against a cut portion of the slab with a desired contact pressure. The swing mechanism includes a pin that rotatably supports the deburring head with respect to a fixed member, and a swing lever attached to the deburring head,
The biasing means comprises a swing cylinder,
2. The deburring of a slab according to claim 1, wherein the oscillating cylinder tilts the deburring head to bring the deburring roller into contact with a cut surface and a lower surface of the slab being conveyed. apparatus. The swing cylinder is a hydraulic cylinder, and a hydraulic oil supply / discharge circuit is connected to the hydraulic cylinder,
The hydraulic oil supply / discharge circuit is provided with a pressure control unit that adjusts to generate a pressing pressure required to sequentially press the deburring roller against the cut surface and the lower surface of the slab being conveyed. 3. A deburring apparatus for a slab according to claim 2, wherein

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