JP4958667B2 - Scarfing device and slag removal method - Google Patents

Description

  The present invention relates to an apparatus and a method for removing (scarfing) slag generated in a cut portion in a slab cutting operation.

As shown in FIG. 1, the slab cutting work is often mechanically performed by a swarf crater 2 arranged on the slab 1. At this time, slag S is generated from an oxidation reaction site (welded portion 1b) on the surface 1a of the slab 1.
The slag S is removed by injecting high-pressure water or compressed air from the direction perpendicular to the cutting direction to the cutting part 1b. For example, in Patent Document 1, generation of slag S at the end point of the welding is prevented by a method such as gradually decreasing the oxygen supplied to the welding crater 2 before the end point of the cutting, and the previous cutting portion 1b The generated slag S is removed with high-pressure water.
Japanese Patent No. 657166 (2nd and 3rd pages, FIG. 1)

  However, the above-mentioned conventional slag removal method is effective for removing partial slag, but in the case where the entire surface of the slab is subjected to cutting or when the amount of cutting is large, a large amount of slag is removed. Since the slag is generated, the slag cannot be completely removed. As a result, there are problems that the unevenness of the welded portion 1b is increased and fins are generated. In addition, the method using high-pressure water has a problem that capital investment for drainage facilities, dust collection facilities, etc. is expensive because a large amount of water is used for removing slag.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an apparatus and a method for removing slag at low cost and with certainty.

The present invention is an apparatus for removing slag generated in a slab in a slab shave, and includes a nozzle that injects a fluid formed by mixing air and water toward the slab. the nozzle is characterized that you have been formed at the rear end of the conduit extending along the scarfing direction of the slab.

  In this case, it is desirable that the nozzles are respectively provided on the left and right sides of the welding portion.

Further, the nozzle, it is further desirable that respect scarfing direction of the slab is bent inwardly by a predetermined angle alpha, in particular, that the predetermined angle alpha is at 35 ° to 45 ° More desirable.
In this case, it is further desirable that the nozzle bends downward by a predetermined angle θ with respect to the surface of the slab, and in particular, the predetermined angle θ is 10 ° or more and 20 ° or less. Is more desirable.

Further, the present invention is a method for removing slag generated in a welded portion in a slab slabing operation , wherein a fluid formed by mixing air and water in the direction of slab cutting. On the other hand, it is sprayed from the front outer side in the cutting direction toward the cutting portion at an angle of not less than 35 ° and not more than 45 ° .

  In this case, it is desirable to inject the fluid from the left and right toward the cut material.

Further, the fluid, in 20 ° angle of less than 10 ° or more with respect to the surface of the slab, it is further desirable to inject toward the scarfing object from the front upper side of the scarfing direction.

  The pressure of the air supplied to the fluid is preferably 0.35 MPa or more and 0.45 MPa or less. Similarly, it is desirable that the pressure of water supplied to the fluid is 0.12 MPa or more and 0.20 MPa or less. The mixing ratio of air and water in the fluid is more preferably 0.38 to 0.42 of water with respect to air 1.

  According to the scarfing device of the present invention and the slag removing method using the same, it is possible to reliably remove the slag in the welded portion while reducing the amount of water used. Therefore, according to the scarfing device of the present invention and the slag removing method using the same, it is possible to remove the slag cheaply and reliably.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
An example of the structure of the scarfing device according to the present invention is shown in FIG. In addition, in FIG. 1, what is used conventionally is used as the cutting crater 2.
The welding crater 2 is provided with a slit-like injection port 3 formed in parallel with the surface 1a toward the surface 1a of the slab 1, and is supported by the slider 5 through the manifold 4 so as to be movable up and down. . Further, the oxygen supply pipe 6 and the fuel supply pipe 7 for cutting are connected to the injection port 3, and the mixture of oxygen and fuel supplied from the oxygen supply pipe 6 and the fuel supply pipe 7, respectively, is injected into the injection port. 3, the surface 1 a of the slab 1 is heated by a flame obtained by injecting the slab 1 toward the surface 1 a of the slab 1 and igniting the air-fuel mixture. In this direction, the slab 1 is relatively moved parallel to the surface 1a of the slab 1 to perform the cutting. In the present invention, the direction of cutting by the welding crater 2 (direction of arrow A in FIG. 1) is defined as the front, and the extending direction of the injection port 3 (direction of arrow B in FIG. 1) is defined as the left and right.

  In the case of the present invention, the cutting crater 2 includes a scarfing device 10 that removes the slag S after the cutting. The scarfing device 10 is a pair of left and right members disposed on both sides of the welding crater 2 so as to sandwich the welding crater 2 from the left and right, and an air pipe 11 that extends downward, and water that joins the air pipe 11 obliquely from above. After extending further downward from the joining portion of the pipe 12, the air pipe 11 and the water pipe 12, it bends backward in the vicinity of the surface 1 a of the slab 1, The pipe 13 extends in parallel with the surface 1a, and the nozzle 14 opens at the rear end of the pipe 13 respectively.

  Each nozzle 14 is bent inward and downward. Specifically, as shown in FIG. 1, each nozzle 14 is bent inward so as to face the side of the welded portion 1 b by a predetermined angle (horizontal angle) α with respect to the front-rear direction. Here, it is desirable to set the range of the angle α to 35 ° or more and 45 ° or less. Further, as shown in FIG. 2, each nozzle 14 is bent downward so as to face the surface 1 a side by a predetermined angle (vertical angle) θ with respect to the surface 1 a of the slab 1. Here, the range of the angle θ is preferably set to 10 ° or more and 20 ° or less. The reason why the angles α and θ are set in the above range is that when the angles α and θ are set in the above range, a fluid formed by mixing air and water is injected from the nozzle 14 toward the slag S, as will be described later. Furthermore, the unevenness of the welded portion 1b is maintained within an appropriate range (for example, when the surface 1a of the slab 1 is used as a reference surface (horizontal plane), the reference surface is within ± 3 mm), and a smooth welded portion 1b is obtained. Because.

  Further, the distance between the left and right of the pair of pipes 13 and the length of each pipe 13 are determined by bending the individual nozzles 14 at the angles α and θ and ejecting the fluid from the nozzles 14. These are set so as to be sprayed from the outer oblique front side to the cutting portion 1b.

Next, the slag removal method using the scarfing apparatus 10 having the above configuration will be described below.
When removing the slag S, air is supplied from the air pipe 11 and water is supplied from the water pipe 12, and a fluid obtained by mixing both is supplied from the individual nozzles 14 through the pipes 13 to the cutting part 1 b. Inject each towards. As a result, the slag S of the welded portion 1b is removed while being appropriately crushed by the injected high-pressure fluid, the welded portion 1b is smoothed, and generation of fins is also prevented. Moreover, since the high quality cast piece 1 which has the smooth cutting part 1b is obtained, generation | occurrence | production of the flaw on the surface of the processed goods which passed through post processes, such as rolling, is also prevented, and a high quality processed goods can be obtained. .

Here, the pressure of the air supplied from the air pipe 11 is 0.35 MPa to 0.45 MPa, the pressure of the water supplied from the water pipe 12 is 0.12 MPa to 0.20 MPa, and the air and water The mixing ratio is desirably set to 0.38 to 0.42 of water with respect to the air 1. The reason why the pressure ratio of air and water and the mixing ratio of air and water are set in the above range is that when the pressure and mixing ratio are set in the above range, a fluid formed by mixing air and water as will be described later. When the nozzle 14 is sprayed from the nozzle 14 toward the cut portion 1b, the unevenness of the cut portion 1b is maintained within an appropriate range (when the surface 1a of the slab 1 is set as a reference plane (horizontal plane), the reference plane is within ± 3 mm). This is because a smooth cut portion 1b is obtained. The amount of water used is, for example, 11 m ³ / hour at a pressure of 1.2 MPa in the conventional slag removal method (the method disclosed in Patent Document 1), whereas in the method of the present invention, the pressure is 0.5 MPa. At 1.4 m ³ / hour. The amount of air used is 3.6 Nm ³ / hour at a pressure of 0.4 MPa.

  That is, according to the slag removal method using the scarfing apparatus 10 of the present invention, the slag S of the welding part 1b is reliably removed with a small amount of water used, and the welding part 1b is smoothed. Further, since the amount of water used is small, the capital investment required for installing the scarfing device 10 can be reduced. Therefore, according to the slag removal method using the scarfing apparatus 10 of the present invention, the slag S can be removed inexpensively and reliably.

Next, an example is shown and the effect of the present invention is explained.
A fluid formed by mixing air and water is sprayed toward the slag S using the cutting crater 2 and the scarfing device 10 shown in FIG. 1, and the horizontal angle α and vertical angle θ of the nozzle 14, air piping 11, the pressure of water supplied from the water pipe 12, the mixing ratio of air and water, and the removal effect of the slag S in the welding part 1 b (the unevenness of the welding part 1 b after injection) ).

(1) Examination of horizontal angle α of nozzle 14 The horizontal angle α of the nozzle 14 was changed within a range of 30 ° to 53 °, the fluid was sprayed toward the slag S, and the unevenness of the welded portion 1b was measured. . The result is shown in FIG.
As shown in FIG. 3, when the range of the angle α is 35 ° or more and 45 ° or less, the unevenness of the welded portion 1b is within an appropriate range (when the surface 1a of the slab 1 is a reference plane (horizontal plane), the reference plane ± 3 mm Within).

(2) Examination of the vertical angle θ of the nozzle 14 The vertical angle θ of the nozzle 14 was changed in the range of 5 ° to 28 °, the fluid was sprayed toward the slag S, and the unevenness of the welded portion 1b was measured. . The result is shown in FIG.
From FIG. 4, if the range of angle (theta) is 10 degrees or more and 20 degrees or less, the unevenness | corrugation of the welding part 1b is maintained in the said appropriate range.

(3) Examination of the pressure of the air supplied from the air pipe 11 The pressure of the air supplied from the air pipe 11 is changed in the range of 0.30 MPa to 0.47 MPa, and the pressure of the water supplied from the water pipe 12 is changed. The fluid was sprayed toward the slag S at 0.16 MPa, and the unevenness of the welded portion 1b was measured. The result is shown in FIG.
From FIG. 5, if the pressure of the air supplied from the air piping 11 is 0.35 MPa or more and 0.45 MPa or less, the unevenness of the welded portion 1b is maintained within the above-described appropriate range.

(4) Examination of the pressure of the water supplied from the water pipe 12 The pressure of the water supplied from the water pipe 12 is changed in the range of 0.08 MPa to 0.25 MPa, and the pressure of the air supplied from the air pipe 11 is changed. The fluid was sprayed toward the slag S at 0.40 MPa, and the unevenness of the welded portion 1b was measured. The result is shown in FIG.
From FIG. 6, if the pressure of the water supplied from the water pipe 12 is 0.12 MPa or more and 0.20 MPa or less, the unevenness of the welded portion 1b is maintained within the above-mentioned appropriate range.

(5) Examination of mixing ratio of air and water The pressure of air supplied from the air pipe 11 is 0.35 MPa to 0.45 MPa, and the pressure of water supplied from the water pipe 12 is 0.12 MPa to 0.20 MPa. Furthermore, the mixing ratio of air and water was changed in the range of water 0.34 to 0.45 with respect to air 1, the fluid was sprayed toward the slag S, and the unevenness of the welded portion 1b was measured. . The result is shown in FIG.
From FIG. 7, if the mixing ratio of air and water is 0.38 to 0.42 of water with respect to air 1, the unevenness of the welded portion 1 b is maintained within the appropriate range.

In the above, preferred embodiments and examples of the present invention have been described. However, the present invention is not limited to these embodiments and examples, and addition of configurations without departing from the spirit of the present invention, Omissions, substitutions, and other changes are also included in the present invention.
For example, in the present embodiment, the split-type cutting method is adopted to suppress capital investment, but a full-width type cutting method may be adopted.
Further, the scarfing device 10 may be constituted by one air pipe 11, water pipe 12, pipe 13 and nozzle 14 provided only on one side of the cutting crater 2, but the slag S is reliably removed. In order to do this, as shown in the present embodiment, the scarfing device 10 is constituted by a pair of left and right air pipes 11, water pipes 12, pipe lines 13, and nozzles 14 arranged on both sides of the machining process 2. It is desirable.

It is an upper perspective view of a cutting crater provided with the scarfing device concerning the present invention. It is an enlarged view along arrow II in Drawing 1 explaining the nozzle perpendicular angle of the scarfing device concerning the present invention. It is a graph which shows the relationship between the horizontal angle of a nozzle and the unevenness | corrugation of a welding part in the scarfing apparatus which concerns on this invention. It is a graph which shows the relationship between the vertical angle of a nozzle and the unevenness | corrugation of a welding part in the scarfing apparatus which concerns on this invention. It is a graph which shows the relationship between the pressure of the air supplied from air piping, and the unevenness | corrugation of a welding part in the slag removal method which concerns on this invention. It is a graph which shows the relationship between the pressure of the water supplied from water piping, and the unevenness | corrugation of a welding part in the slag removal method which concerns on this invention. It is a graph which shows the relationship between the mixing ratio of the air supplied from air piping, and the water supplied from water piping, and the unevenness | corrugation of a welding part in the slag removal method which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cast slab, 1a ... Slab surface, 1b ... Cutting part, 2 ... Cutting crater, 10 ... Scarfing device, 11 ... Air piping, 12 ... Water piping, 13 ... Pipe line, 14 ... Nozzle, (alpha) ... Horizontal angle of nozzle, θ ... Vertical angle of nozzle

Claims (12)

An apparatus for removing slag generated in a cut portion in a slab cutting operation,
A nozzle for ejecting toward the fluid obtained by mixing air and water to the scarfing unit, the nozzle, that you have been formed at the rear end of the conduit extending along the scarfing direction of said slab Features a scarfing device.   The scarfing device according to claim 1, wherein the nozzle is provided on each of the left and right sides of the welding portion. The scarfing device according to claim 1 , wherein the nozzle is bent inward by a predetermined angle α with respect to a cutting direction of the cast slab. The scarfing device according to claim 3 , wherein the predetermined angle α is not less than 35 ° and not more than 45 °. The nozzle, the cast strip scarfing apparatus according possible to 4 claims 1, characterized in that bent downward by a predetermined angle θ to the surface of the. The scarfing device according to claim 5 , wherein the predetermined angle θ is not less than 10 ° and not more than 20 °. It is a method for removing slag generated in the welded part in the slab melting work,
A fluid formed by mixing air and water is sprayed from the front outer side in the cutting direction toward the cutting portion at an angle of 35 ° to 45 ° with respect to the cutting direction of the slab. And slag removal method. The slag removing method according to claim 7 , wherein the fluid is sprayed from the left and right toward the workpiece. Said fluid, at 20 ° angle of less than 10 ° or more with respect to the surface of the slab, from the front upper side of the scarfing direction according to claim 7 or 8, characterized in that injecting toward the scarfing product Slag removal method. Deslagging process according to claims 7 to 9, characterized in that the pressure of air supplied to said fluid is less than 0.45MPa least 0.35 MPa. Deslagging process according to claim 7 to 10, wherein the pressure of the water supplied to the fluid is less than 0.20MPa least 0.12 MPa. Deslagging process according to 11 to claims 7, wherein the mixing ratio of air and water in said fluid, to the air 1 is water from 0.38 to 0.42.

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