JP2021137845A - Deburring method, cooling setup, and method for manufacturing deburring setup and work-piece - Google Patents

Abstract

To provide a deburring method that can achieve a sufficient deburring rate even where a work-piece such as a slab or billet is in a high temperature state.SOLUTION: A deburring method includes injecting a cooling liquid from cooling means to a burr existing at a lower end of a worked face of a work-piece in a high temperature state so as to cool the burr and thereafter removing the burr.SELECTED DRAWING: None

Description

The present invention applies to a deburring method for removing burrs, which are protrusions generated on a machined surface of a work piece, for example, by cutting, during the production of a work piece, for example, a slab, bloom, or billet, and the method. The present invention relates to a cooling facility, a deburring facility, and a method for manufacturing a workpiece using the deburring facility.

For example, when molten steel is continuously cast and cut to a predetermined length with a gas cutting machine to manufacture a slab or billet, so-called burrs are generated on the lower edge of the cut surface toward the cut surface. There is. That is, since a slab or billet is produced by cutting (fusing) a steel ingot by the flame of a gas cutting machine, the slab is mainly on the bottom edge, and the billet is on the lower side. A part of the melted steel material remains as burrs on the side edge. If the slab or billet is rolled as it is in the next process without removing the burrs, there is a high possibility that defects due to the burrs will occur in the product, so it is necessary to remove the burrs after the gas cutting. Become. In addition, if deburring is incomplete, the slab needs to be re-maintained, which reduces production efficiency.
Deburring can be carried out especially while the slab or billet is hot, which is advantageous from the viewpoint of productivity.

As a conventionally proposed method for removing burrs from a slab, it has been proposed to advance the cutting edge of a cutter along the lower surface of the slab to remove burrs (see, for example, Patent Document 1).

As another method for removing burrs from the slab, a rotor for holding the hammer is provided, and the head of the hammer is rotated by the rotor to give the hammer an envelope-like movement so that the hammer can be moved to the lower end surface of the slab. A method of removing burrs by contacting with a hammer has been proposed in Patent Document 2.

Further, Patent Document 3 includes a deburring blade for scraping burrs and an arm for swinging the blade left and right, and moves forward or backward along the burr attachment direction while swinging the blade left and right. A method of removing burrs has been proposed.

Japanese Patent Application Laid-Open No. 11-277322 Japanese Patent Application Laid-Open No. 7-205000 DE 3515111 A1

In the technique described in Patent Document 1, a high removal rate can be achieved by deburring a slab having a low C equivalent, that is, relatively soft, represented by a low carbon steel, while a steel type having a high C equivalent, that is, a hard steel type. However, there is a problem that the removal rate is remarkably lowered.

Further, in the technique described in Patent Document 2, since the equipment configuration is complicated and it takes a long time to replace the hammer of the deburring part, the equipment operating rate and maintenance are particularly high when the equipment is installed in the route of the in-line equipment. There was a problem in that respect.

In this respect, the technique described in Patent Document 3 has a simple equipment structure and the jig can be easily replaced in a short time. It is advantageous in terms of manufacturing efficiency that this deburring device is arranged between the slab manufacturing process and the hot rolling process. However, when a deburring device is installed downstream of a continuous casting machine and a gas cutting machine to remove burrs from high-temperature slabs, the burrs are also in a soft state at high temperatures, so when removing with a jig, the burrs themselves will be removed. The problem was that it would bend or stretch, causing poor removal. This also poses a problem in the techniques described in Patent Documents 1 and 2.

An object of the present invention is to provide a deburring method and deburring equipment capable of achieving a sufficient deburring rate even when a workpiece such as a slab or a billet has a high temperature.

In order to solve the above-mentioned problems, the inventors examined a method for solving the problem of deburring a slab, which is particularly hot. We have found that it is effective in removing burrs in hot slabs.

That is, the gist of the present invention is as follows.
(1) A method for removing burrs, which removes the burrs after cooling the burrs by injecting a cooling liquid from the cooling means onto the burrs existing at the lower end of the machined surface of the work piece in a high temperature state.

(2) The deburring method according to (1) above, wherein the total supply amount of the coolant ejected from the cooling means is 50 L / min or more and 700 L / min or less.

(3) A cooling facility provided with cooling means having a plurality of injection ports for injecting a cooling liquid into burrs existing at the lower end of the machined surface of the work piece.

(4) The cooling equipment according to (3) above, wherein the total supply amount of the coolant ejected from the cooling means is 50 L / min or more and 700 L / min or less.

(5) The cooling equipment according to (3) or (4), further comprising a positioning means for adjusting the position of the workpiece.

(6) The positioning means has a shaft portion rotatably provided across a transport line for transporting the workpiece, and a workpiece whose base end side is attached to the shaft portion and whose tip end side is the workpiece on the transport line. The cooling equipment according to (5) above, further comprising an arm that abuts on the machined surface of the machine and adjusts the position of the workpiece on the transport line.

(7) The positioning means has a plurality of the arms arranged in parallel at predetermined intervals, and has a flow path for ejecting the coolant from the injection port to the burr through between the arms. The cooling equipment according to (6) above.

(8) The cooling equipment according to any one of (3) to (7) above, wherein the ejection angle of the coolant with respect to the axis of the injection port is 15 ° or less.

(9) A cooling facility provided with a cooling means having a plurality of injection ports for injecting a coolant to burrs existing at the lower end of the machined surface of the work piece, and a positioning means for adjusting the position of the work piece. , A burr removing device comprising a burr removing means for removing the burr.

(10) A work piece transport facility provided with the deburring facility according to (9) above.

(11) A method for manufacturing a work piece, which removes burrs on the work piece using the deburring equipment according to (9) above.

By removing the burrs after cooling the burrs according to the present invention, it is possible to dramatically increase the removal rate of the burrs. Therefore, for example, when hot rolling, which is a step following the production of the slab, is carried out, it is possible to reduce the defect occurrence rate due to burrs. Even more remarkable effect is obtained when hot rolling is performed without slab maintenance. Further, the apparatus of the present invention can be easily incorporated into, for example, a slab production line.

It is a figure which shows the outline of the deburring equipment of this invention. It is a figure which shows the outline of another deburring equipment of this invention. It is a figure which shows the structure of the positioning means and the nozzle of the deburring equipment. It is a figure explaining the operation of the positioning means of the deburring equipment. It is a figure which shows the ejection flow path of the coolant. It is a figure which shows the ejection flow path of the coolant. It is a figure which shows the ejection flow path of the coolant.

[First Embodiment]
Hereinafter, the deburring method of the present invention will be described in detail with reference to the drawings. The deburring method of the present invention can be applied to slabs, blooms, billets and the like, but the case where it is applied to slabs will be described below as an example.
First, as shown in FIG. 1, the deburring equipment of the present invention includes a deburring means 2 that advances and retreats with respect to the slab 1. As mentioned above, the slab is in a hot state. Here, the high temperature state is a temperature of about 500 ° C. to 700 ° C. Therefore, it is characterized in that it further includes a cooling means 3 for injecting the cooling liquid 4 toward the portion where the burr 10 of the slab 1 remains. The device configuration is not particularly limited as long as the deburring means 2 has a structure capable of advancing and retreating the deburring jig with respect to the burr generation region on the bottom surface side of the slab 1. Therefore, the deburring means 2 may have any of the configurations described in Patent Documents 1, 2 and 3 described above, for example. Alternatively, it does not have to have the configuration described in Patent Documents 1, 2 and 3.

Further, the cooling means 3 does not need to be particularly limited in configuration as long as the cooling liquid 4 can be injected toward the burr 10 existing at the lower edge of the cut surface of the slab 1 to cool the burr 10. For example, a method of spraying the coolant through a plurality of holes provided in the pipe through which the coolant passes, or injecting the coolant through a plurality of nozzles connected to the pipe of the same coolant can be adopted. Water may be used as the coolant, and other suitable coolants can also be used.

The deburring equipment having the above configuration transports the slab 1 to the installation location of the deburring equipment, or moves the deburring equipment to the slab 1 that has been cut and processed on the transport line to move the slab 1. 1. The deburring means 2 and the cooling means 3 are arranged as shown in FIG. 1 (a). Next, as shown in FIG. 1B, the cooling liquid 4 is injected toward the burr 10 of the slab 1 in a high temperature state by the cooling means 3 to cool the burr 10. Here, it is preferable to sufficiently supply the coolant 4 to sufficiently cool the burr 10.

When the burr 10 is cooled by the above-mentioned cooling treatment, as shown in FIG. 1C, the burr removing means 2 is advanced toward the slab 1, and the burr removing means 2 is moved along the burr 10 generation region. To remove the burr 10. During this deburring operation, the supply of the coolant 4 may be stopped, but the deburring may be performed while continuing the supply of the coolant 4.

Here, it is desirable that the total amount of coolant supplied to the burr portion is 50 L / min or more and 700 L / min or less. This is because if it is less than 50 L / min, cooling will not be performed sufficiently and deburring will be incomplete. On the other hand, if it exceeds 700 L / min, the cooling effect will be saturated and the deburring rate will change so much. Because there is no. A more preferred lower limit is 100 L / min and a more preferred upper limit is 500 L / min. Since the properties of burrs differ depending on the steel type of the slab, the total supply amount may be appropriately determined depending on the steel type of the slab.

The total supply amount of the coolant may be specified anywhere, but it is convenient to provide a measuring means in the middle of the piping from the coolant supply means (not shown) to the cooling means 3 for measurement. be. Any measuring means can be used without particular limitation as long as the total amount of the coolant supplied from the supply means can be measured.

Further, the slab to be cooled has a steel type in which the viscosity of burrs does not easily decrease even at a high temperature. In such a case, the degree of cooling can be adjusted according to the steel type. For example, the degree of cooling is adjusted according to the C equivalent of the slab. That is, the relationship between the C equivalent of the slab, the slab temperature, and the burr removal rate is investigated in advance, and the degree of cooling is supplied as the coolant according to the slab temperature at which the increase in the burr removal rate derived from these relationships is saturated. Adjust by adjusting the amount. Therefore, if the burr removal rate does not increase so much, it is also an option not to supply the coolant.

When the coolant 4 hits the cut surface of the slab widely, the cutting temperature becomes low. If the temperature of the cut surface becomes too low, problems such as uneven temperature distribution in the cut surface and the temperature difference between the cut surface and the inside of the slab may cause cracks in the slab depending on the steel type. Sometimes. Therefore, it is preferable that the coolant 4 mainly hits the burr 10 and the range of hitting the slab cut surface is minimized.

As described above, the deburring method of the present invention is characterized in that the burr 10 is cooled by using the cooling means 3 to reduce the viscosity of the burr prior to the removal of the burr. That is, since the burrs are hardened by cooling when the burrs are removed, the burrs themselves can be reliably removed without stretching or being greatly curved when the deburring jig comes into contact with the burrs. In this way, the burrs whose viscosity has decreased are removed, so that the burr removal rate is significantly increased.

[Second Embodiment]
Next, as another form of the deburring equipment of the present invention, a deburring equipment suitable for being deployed on a transport line in the slab manufacturing process will be specifically described with reference to FIGS. 2 and 2.
That is, reference numeral 5 in FIG. 2 is a transport line of the slab 1, and a burr removing means 2 is installed on the transport line 5 so as to be able to advance and retreat in a direction orthogonal to the transport direction. Reference numeral 5a is a roll for transporting the slab 1, and the transport line 5 is composed of a plurality of arrays of the rolls 5a. Further, the slab 1 has cut surfaces at both ends in the longitudinal direction.
In this illustrated example, the burr removing means 2 is a swing-type deburring device described in Patent Document 3 described above, and is a device main body 2a that advances and retreats toward the transfer line 5 and a transfer line from the device main body 2a. It has a swing arm 2b extending toward 5, and a deburring jig 2c attached to the tip of the swing arm 2b. Needless to say, another deburring device can be applied to the deburring means 2.

Here, it is necessary to position the front end or the rear end of the slab 1 on the transport line 5 on the movement path of the swing arm 2b of the deburring means 2. Therefore, in the deburring equipment shown in the figure, the deburring means It has a positioning means 6 for adjusting the position with respect to 2. Then, cooling means 3 are installed on each of the entry side and the exit side of the positioning means 6 in the slab transport direction. The positioning means 6 and the cooling means 3 will be described in detail below with reference to FIGS. 3 and 4.

First, as shown in FIG. 3, the positioning means 6 includes a shaft 6a that straddles the upper part of the transport line 5 and is installed in a direction orthogonal to the transport line 5, and a plurality of positioning means 6 fixed to the shaft 6a at equal intervals. In the illustrated example, it has six L-shaped arms 6b. These shafts 6a and arms 6b are provided on the front side and the rear side in the slab transport direction so as to remove burrs on the cut surfaces at both ends in the longitudinal direction of the slab. As for the arm 6b, since the front arm 6b is used for aligning the tip of the slab 1 and the rear arm 6b is used for aligning the rear end of the slab 1, as shown in FIG. 6b has a similar shape. The shaft 6a may be installed independently as shown in the drawing, or may be installed by being attached to the structure of the transport equipment.

The alignment of the slab 1 by the arm 6b will be described by taking the tip end side of the slab as an example. That is, as shown in FIG. 4A, when the slab 1 is transferred to the installation location of the deburring means 2, the shaft 6a is rotated to move the arm 6b downward, and the tip portion of the arm 6b Is pressed against the tip surface of the slab 1. After that, as shown in FIG. 4B, the arm 6b is stopped at the position where the tip end portion becomes the lowest point. The position where the tip of the arm 6b is the lowest point is the position where the lower end edge of the tip surface of the slab 1 is on the movement path of the swing arm 2b of the deburring means 2 described above. Therefore, the slab 1 is arranged at a position suitable for deburring.
The above alignment operation is the same for the rear end surface of the slab 1, and as shown in FIG. 3, the moving direction of the arm 6b is opposite to that of the front end surface of the slab 1.

As described above, once the slab is aligned with the predetermined position, it is necessary to cool the burr 10 prior to deburring by the deburring means 2. In the illustrated example, the cooling means 3 used here has a pipe 3a through which the coolant 4 is passed and a nozzle 3b connected to the pipe 3a. That is, the cooling means 3 of the illustrated example has an ejection flow path 4a for injecting the cooling liquid 4 from the nozzle 3b into the slab 1 between the above-mentioned arms 6b, and is provided in the gap between the six arms 6b. In order to arrange one nozzle 3b, a total of five nozzles 3b are installed. These pipes 3a and nozzles 3b are provided on the front side and the rear side in the slab transport direction, respectively.

Here, the direction of the nozzle 3b is appropriately adjusted so that the ejection flow path 4a of the coolant 4 from the nozzle 3b faces the burr 10 of the slab 1. For example, when the cooling means 3 is provided at the position shown in FIG. 3, as shown in FIG. 5, the ejection flow path 4a of the coolant 4 from the nozzle 3b extends diagonally downward from the nozzle 3b and reaches the burr 10. It becomes a route. Cooling the burr 10 and its adjacent areas has the advantage of avoiding reheat from the slab to the burr.

In the example of FIG. 5, the direction of the nozzle 3b when the cooling means 3 is arranged above the transport line 5 of the slab 1 is shown. For example, as shown in FIG. 6, a branch extending from the pipe 3a of the cooling means 3 is shown. The pipe 3c may be expanded and contracted so that the ejection flow path 4a from the nozzle 3b is in the horizontal direction. Alternatively, if a space can be secured below the transport line 5 of the slab 1, a cooling means 3 is installed in this space, and as shown in FIG. 7, the ejection flow path 4a from the nozzle 3b is directed upward or diagonally upward. May be good.

Further, since the cooling efficiency decreases when the injection of the coolant 4 from the nozzle 3b diffuses, the cooling liquid 4 is 15 ° with respect to the axis of the nozzle 3b, although it depends on the distance from the nozzle 3b to the slab 1 and the injection pressure. It is preferable to have an ejection angle that falls within the following radiation range. More preferably, it is 10 ° or less. However, since the number of nozzles 3b installed is limited, if the ejection angle is too narrow, the cooling range of the burr 10 may become too narrow and some parts may not be cooled. Therefore, the ejection angle should not be too narrow. Better. The distance from the nozzle 3b to the slab 1 and the injection pressure are preferably adjusted appropriately in consideration of restrictions on the installation location of the deburring equipment.

As described above, the total amount of the coolant supplied from the nozzle 3b is preferably 50 L / min or more and 700 L / min or less in the pipe 3a, for example, regardless of the number of nozzles.

As described above, after the burrs are cooled by the cooling means 3, the burrs are removed by using the burr removing means 2. When applying the burr removing means 2 of FIG. 2, first, the apparatus main body 2a is moved toward the slab 1 placed at a predetermined position, and the swing arm 2b is swung while the tip of the swing arm 2b is swung. The deburring jig 2c is brought into contact with the burr to remove the burr.

An example in which the present invention is applied to deburring a slab will be described below.
A plurality of slabs having a width of 1200 to 2300 mm and a surface temperature of 500 ° C. or higher immediately after cutting were prepared, and deburring work was performed on the lower end surface of the slab using a swing-type deburring means. At that time, the deburring equipment shown in FIGS. 2 to 5 is applied, and after positioning the tip surface of the slab, cooling water is supplied from the nozzle 3b as a coolant 4 to the lower end of the tip surface to cool the burr portion. After that, the burrs were removed by the deburring means. When the burr was removed by using the burr removing means when the burr portion was sufficiently cooled, the burr removal rate, which was about 80% in the past, could be increased to 90% or more. Here, the temperature of the burr was measured with a radiation thermometer, and if the measured temperature dropped to 300 ° C., it was judged that the cooling was sufficient.
The burr removal rate was defined as the ratio of the number of slabs in which burrs remained to the number of slabs in which burrs were removed. The presence or absence of burrs was visually confirmed, and the slab determined to require further deburring was determined to have burrs remaining.

As a comparison, when a similar slab was prepared and deburring work was performed on the lower end surface of the slab using the same swing-type deburring means without cooling, the deburring rate was 82%. rice field.

Incidentally, in the above-described embodiment, an example of deburring for a high-temperature slab has been described, but the present invention is not limited to this, and can be carried out even when removing burrs on the cut surface of a high-temperature bloom or billet. Is.

1 Slab 2 Deburring means 2a Device body 2b Swing arm 2c Deburring jig 3 Cooling means 3a Piping 3b Nozzle 4 Coolant 5 Conveying line 6 Cooling means 6a Frame 6b Shaft 6c Arm

1 Slab 2 Deburring device 2a Device body 2b Swing arm 2c Deburring jig 3 Cooling means 3a Piping 3b Nozzle
3c branch pipe 4 coolant 5 transport line 6 positioning means 6a axis 6b arm

Claims (11)

A method for removing burrs, which removes the burrs after cooling the burrs by injecting a cooling liquid from the cooling means onto the burrs existing at the lower end of the processed surface of the work piece in a high temperature state. The deburring method according to claim 1, wherein the total supply amount of the coolant ejected from the cooling means is 50 L / min or more and 700 L / min or less. A cooling facility provided with a cooling means having a plurality of injection ports, which injects a cooling liquid into a burr existing at the lower end of a machined surface of a work piece. The cooling equipment according to claim 3, wherein the total supply amount of the coolant ejected from the cooling means is 50 L / min or more and 700 L / min or less. The cooling equipment according to claim 3 or 4, further comprising a positioning means for adjusting the position of the workpiece. The positioning means includes a shaft portion rotatably provided across a transport line for transporting the work piece, a base end side is attached to the shaft portion, and the tip end side is a machined surface of the work piece on the transport line. The cooling equipment according to claim 5, further comprising an arm that abuts on and adjusts the position of the workpiece on the transport line. 6. The positioning means has a plurality of the arms arranged in parallel at predetermined intervals, and has an ejection flow path of the cooling liquid from the injection port to the burr through between the arms. Cooling equipment described in. The cooling equipment according to any one of claims 3 to 7, wherein the ejection angle of the coolant with respect to the axis of the injection port is 15 ° or less. A cooling facility provided with cooling means having a plurality of injection ports for injecting a coolant to burrs existing at the lower end of the machined surface of the work piece, a positioning means for adjusting the position of the work piece, and the burr. Deburring means, which removes burrs, and deburring equipment. A work piece transport facility comprising the deburring facility according to claim 9. A method for manufacturing a work piece, which removes burrs on the work piece using the deburring equipment according to claim 9.

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