JP6149820B2 - Hot working equipment and hot working method - Google Patents

Description

  The present invention relates to a hot processing facility and a hot processing method for processing a workpiece such as a slab manufactured by continuous casting in a hot state.

  In a continuous casting facility, a slab is continuously produced from molten steel, and the slab is cut to a length of about 10 m and sent to a hot rolling line in the next process as a rolling material. In this hot rolling line, the slab is usually heated in a heating furnace and then subjected to hot rolling.

  By the way, the slab has an inclusion defect that occurs in the casting stage. In particular, the inclusion defect existing up to several millimeters below the surface of the slab is formed on the surface of the steel sheet in the rolling process or the plating process after the next process. Generate a state defect. Such inclusion defects originate from deoxidation products such as mold powder and alumina used during continuous casting, and inclusions having a size of about several hundred microns are said to cause defects.

  For this reason, conventionally, the entire surface of the slab surface layer manufactured by the casting equipment is subjected to hot cutting (scarf), surface grinding with a grinder, and the surface of the steel plate is cut with a cutting blade to care for the surface of the slab. It is generally done.

  Among these, care with a cutting blade is attracting attention as a highly efficient care method with few surface defects. Conventionally, a technique of cutting a cold work material with a general-purpose gate-type machining facility has been used for cutting a work material with a cutting blade. The gate-type processing equipment is provided with a bed on which the work material is installed via a skid, a rail that is provided integrally with the bed, and that is provided on both sides of the work material, and is movable on the rail. A processing apparatus having a columnar frame, and cutting the workpiece while moving the processing apparatus along the rail through the columnar frame, and processing is normally performed in a cold state.

  On the other hand, the steel material in the hot state has a lower specific cutting resistance at the time of cutting than the steel material in the cold state, and particularly at 500 ° C. or higher, it is reduced to 2/3 to 1/2 in the cold state. The machinability (free machinability) is good, and the surface roughness of the cut surface is also good. Moreover, the thermal energy at the time of reheating a slab can be reduced by performing the surface care in a hot state. For this reason, performing surface care of the steel slab by cutting in a hot state has been studied (Patent Documents 1 to 4).

JP 2004-181561 A Japanese Patent Laid-Open No. 9-47913 JP 2010-125547 A JP 2010-149201 A

  When processing slabs in a hot state, it is conceivable to use a portal processing facility, but when performing a cutting process on a workpiece in a hot state with the portal processing facility, When the hot slab after continuous casting is used as the work material, the temperature reaches 800 ° C., so that the heat of the work material is transferred to the bed and the bed is thermally expanded. When the bed is thermally expanded, the rail is provided integrally with the bed, so that the rail interval is widened and it is difficult to run the processing apparatus. Moreover, even if the processing apparatus can run, the cutting accuracy is reduced due to thermal deformation of the bed or the like. For this reason, it is difficult to process a workpiece in a hot state using a general-purpose portal processing facility.

  The present invention has been made in view of such circumstances, and provides a hot working facility and a hot working method capable of suppressing inconvenience due to thermal expansion and hot working a workpiece with high accuracy. This is the issue.

  In order to solve the above problems, the present invention provides the following (1) to (10).

(1) a bed on which a hot workpiece is installed;
Rails provided integrally with the bed and provided on both sides with the work piece placed on the bed sandwiched between,
A processing device that is provided so as to be movable on the rail and that performs hot processing on a workpiece,
A dam member provided to surround a work material installation area for installing the work material on the bed, and a dam member for damming cooling water to form a cooling water pool on the bed;
A cooling water supply mechanism for supplying cooling water to the workpiece installation area,
In a state where the bed is cooled by the cooling water pool, the workpiece is installed at a predetermined position in the workpiece installation area, and the workpiece is moved on the rail, and the workpiece is subjected to predetermined hot working. Hot working equipment characterized by applying

  (2) The apparatus further includes a support member provided on the bed, the workpiece is installed on the bed via the support member, and the cooling water pool is immersed in a part of the support member. The hot working facility according to (1), wherein the work material is prevented from touching the cooling water when the work material is installed.

  (3) The hot working facility according to (1) or (2), further comprising movement restraining means for restraining movement of the workpiece in the workpiece installation area.

  (4) The hot working facility according to (3), wherein a part of the movement restraining means is immersed in the cooling water pool.

  (5) The hot processing facility according to any one of (1) to (4), wherein the workpiece is a hot slab manufactured by continuous casting.

  (6) The hot processing facility according to any one of (1) to (5), wherein the processing device includes a cutting mechanism that performs a cutting process on a surface of the workpiece.

(7) A bed on which a workpiece in a hot state is installed, a rail provided integrally with the bed, a rail provided on both sides of the workpiece to be installed on the bed, and a movement on the rail A hot working method in a hot working facility having a processing device that is provided and capable of performing hot working on a workpiece,
A cooling water pool is formed in the work material installation area for installing the work material on the bed, and then the work material is installed at a predetermined position in the work material installation area, and the processing device is moved on the rail. A hot working method characterized by subjecting a workpiece to predetermined hot working.

  (8) A support member that supports the workpiece is provided on the bed, and the cooling water pool is formed at a height that allows a part of the support member to be immersed, and then the workpiece is attached to the support member. The hot working method according to (7), wherein the work material is placed on the bed so that the workpiece does not touch the cooling water.

  (9) The hot working method according to (7) or (8), wherein the workpiece is a hot slab manufactured by continuous casting.

  (10) The hot working method according to any one of (7) to (9), wherein the hot working is a cutting work on a surface of the workpiece.

  According to the present invention, since the hot work material is installed on the bed with the cooling water pool formed in the work material installation area on the bed, the thermal expansion of the bed or the like due to the heat of the work material Therefore, it is possible to prevent the traveling of the processing apparatus from being hindered by the deformation of the rail, and the cutting accuracy from being lowered due to the thermal deformation of the bed or the like.

It is sectional drawing which shows the hot processing equipment which concerns on one Embodiment of this invention. It is a top view which shows the hot processing equipment which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a sectional view showing a hot working facility according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. In the present embodiment, a hot working facility that mills the surface of a hot slab after continuous casting will be described as an example of the hot working facility.

  A hot processing facility 100 according to the present embodiment is configured as a portal processing machine, and a bed 11 on which a hot slab 1 that is a workpiece in a hot state is installed via a skid 12, and the bed 11 are integrated. A rail 13 provided on both sides of the hot slab 1 installed on the bed 11, a processing device 14 provided movably on the rail 13, and the hot slab 1 on the bed 11 A slab that is provided so as to surround the slab installation region 17 to be installed, and that dams the cooling water to form the cooling water pool 15 on the bed 11 and the slab surrounded by the dam member 16 on the bed 11 A cooling water supply mechanism 18 that supplies cooling water to the installation area 17 and a drainage mechanism 19 that drains the cooling water are provided.

  The surface of the hot slab 1 has a high temperature of about 800 ° C., and the hot slab 1 is positioned with the longitudinal direction sandwiched between the fixed block 21a and the movable block 21b as shown in the figure, and the movement of the hot slab 1 is suppressed. The position of the movable block 21 b can be adjusted by the actuator 22. The fixed block 21a and the movable block 21b function as movement restraining means for restraining the movement of the hot slab 1. The hot slab 1 is installed at a predetermined position in the slab installation area 17 by an overhead crane (not shown). A block may also be provided on the side surface of the slab 1 in order to more reliably suppress the movement of the hot slab 1.

  The processing apparatus 14 includes a frame 31 that moves on the rail 13, a processing head 32 that is movable in the vertical direction and the width direction of the hot slab 1 with respect to the frame 31 by a driving mechanism (not shown), and the processing head 32. It has a cutting mechanism 33 that is rotatably provided by an internal rotation mechanism and that cuts the surface of the hot slab 1. The cutting mechanism 33 is movable in the vertical direction and the width direction of the hot slab 1 with respect to the frame 31 via the machining head 32.

  The frame 31 has two columnar portions 31a having a slider 34 fitted to the rail 13 via a roller 35 at the lower end portion, and a horizontal portion 31b connecting the two columnar portions 31a. As the slider 34 moves along the rail 13, the frame 31 is moved on the rail 13 in the longitudinal direction of the hot slab 1. Further, the cutting mechanism 33 has a disk shape, and a plurality of cutting tips (not shown) are attached and rotated to cut the surface of the hot slab 1 with the cutting tips.

  The cooling water supply mechanism 18 supplies the cooling water to the slab installation area 17 to form the cooling water pool 15 when the hot slab 1 that is the workpiece is processed. The bed 11 is cooled by the cooling water pool 15. At this time, the height (water depth) of the cooling water pool 15 is set such that a part of the skid 12 is immersed in the cooling water. As a result, the hot slab 1 separated from the surface of the head 11 by the skid 12 is not brought into contact with the cooling water pool 15. A part of the blocks 21 a and 21 b is also cooled by the cooling water pool 15.

  The height (water depth) of the cooling water pool 15 is set to a value that considers the cooling efficiency of the bed 11 and the like, and is about 200 mm, for example. The height of the weir member 16 is set to a height that is substantially the same as the set height (water depth) of the pool 15, and the cooling water that exceeds the height of the weir member 16 can overflow. Thereby, the height (water depth) of the pool 15 can always be maintained at a desired value without providing any special means.

  The drainage mechanism 19 can drain not only the cooling water in the cooling water pool 15 but also the cooling water overflowing the weir member 16.

  In the hot processing facility 100 configured as described above, first, cooling water is supplied from the cooling water supply mechanism 18 to the slab installation region 17 surrounded by the dam member 16 to form the cooling water pool 15. At this time, the height (water depth) of the cooling water pool 15 is set to a height at which a part of the skid 12 is immersed in the cooling water, for example, about 200 mm.

  In this state, the hot slab 1 is installed at a predetermined position in the slab installation area 17 where the cooling water pool 15 is formed by the overhead crane. At this time, the hot slab 1 is installed on the skid 12 in a state of being separated from the surface of the bed 11. Thereby, the hot slab 1 is not brought into contact with the cooling water.

  In this state, the position of the machining head 32 of the machining apparatus 14 is adjusted, the cutting mechanism 33 is rotated while the machining apparatus 14 travels along the rail 13, and heat is applied by a cutting tip (not shown) of the cutting mechanism 33. The surface of the intermediate slab 1 is cut.

  Thus, by cutting the hot slab 1 in a high temperature state, the specific cutting resistance at the time of cutting is smaller than that in the cold state slab, and good machinability (free machinability) is obtained. be able to. Moreover, the thermal energy at the time of reheating a slab can be reduced by performing the surface care in a hot state in this way.

  By the way, since the hot slab is at a high temperature of about 800 ° C., if the conventional gate-type processing equipment excluding the cooling pool is removed from the hot processing equipment 100, the bed 11 is made of steel. The bed 11 greatly expands due to the heat of the intermediate slab, and the rail 13 provided integrally with the bed spreads, making it difficult for the processing apparatus 14 to travel. Moreover, since the bed 11, the rail 13, the skid 12, the blocks 21a, 21b, and the like are also made of steel, they are thermally deformed by the heat of the hot slab and adversely affect the cutting accuracy.

  In contrast, in the hot processing facility 100 of the present embodiment, since the bed 11 is cooled by the cooling water pool 15, thermal expansion is suppressed, and the rail 13 provided integrally with the bed 11 is deformed. It is suppressed. For this reason, it can be avoided that the processing apparatus 14 is difficult to travel. Further, since the skid 12 and the blocks 21a and 21b are also immersed in the cooling water pool 15, thermal deformation of the skid 12 and the blocks 21a and 21b in addition to the bed 11 and the rail 13 can be suppressed, and cutting accuracy can be improved. Can be kept high. Further, since the cooling water is prevented from contacting the hot slab 1, it is possible to prevent the heat of the hot slab 1 from being lost by the cooling water.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the case where the hot slab after continuous casting is applied as a workpiece is shown, but the present invention is not limited to this as long as the workpiece is in a hot state. In the above embodiment, milling has been described as an example of hot working. However, cutting other than milling may be used, and the present invention is not limited to cutting. For example, hot cutting (scarfing), etc. Needless to say, the present invention can also be applied to hot working.

DESCRIPTION OF SYMBOLS 1 Hot slab 11 Bed 12 Skid 13 Rail 14 Processing apparatus 15 Cooling water pool 16 Weir member 17 Slab installation area 18 Cooling water supply mechanism 19 Drain mechanism 21a Fixed block 21b Movable block 22 Actuator 31 Frame 31a Column-shaped part 31b Horizontal part 32 Processing Head 33 Cutting mechanism 34 Slider 35 Roller 100 Hot working equipment

Claims (8)

A bed where hot work material is installed;
Rails provided integrally with the bed and provided on both sides with the work piece placed on the bed sandwiched between,
A processing device that is provided so as to be movable on the rail and that performs hot processing on a workpiece,
A dam member provided to surround a work material installation area for installing the work material on the bed, and a dam member for damming cooling water to form a cooling water pool on the bed;
A cooling water supply mechanism for supplying cooling water to the workpiece installation area ;
Movement restraining means for restraining movement of the workpiece in the workpiece installation area ;
In a state where the bed is cooled by the cooling water pool , and in a state where a part of the movement restraining means is immersed in the cooling water pool, a work material is installed at a predetermined position in the work material installation region, and A hot processing facility for performing predetermined hot processing on a workpiece while moving a processing device on the rail.   The apparatus further includes a support member provided on the bed, the work piece is installed on the bed via the support member, and the cooling water pool has a degree to which a part of the support member is immersed. The hot processing equipment according to claim 1, wherein the hot processing equipment is set to a height so that the work material does not touch the cooling water when the work material is installed. The workpiece is, hot working equipment according to claim 1 or claim 2, characterized in that a hot slab produced by continuous casting. The hot processing facility according to any one of claims 1 to 3 , wherein the processing apparatus includes a cutting mechanism that performs a cutting process on a surface of the workpiece. A bed on which a workpiece in a hot state is installed, a rail provided integrally with the bed, rails provided on both sides of the workpiece to be installed on the bed, and movable on the rail A processing device for hot-working the work material, a weir member provided so as to surround the work material installation area for installing the work material on the bed, and cooling to the work material installation area A hot working method in a hot working facility having a cooling water supply mechanism for supplying water and a movement restraining means for restraining movement of the workpiece in the workpiece installation area ,
A cooling water pool is formed in a work material installation area in which the work material on the bed is placed surrounded by the dam member, the bed is cooled by the cooling water pool, and the movement inhibiting means A part of the workpiece is immersed in the cooling water pool, and then the workpiece is installed at a predetermined position in the workpiece installation area, and the workpiece is moved on the rail while the workpiece is moved to a predetermined temperature. A hot working method characterized by performing processing. A support member that supports the workpiece is provided on the bed, and the cooling water pool is formed at a height enough to immerse a part of the support member, and then the workpiece is inserted through the support member. The hot working method according to claim 5 , wherein the hot working method is installed on a bed so that a workpiece does not touch cooling water. The hot working method according to claim 5 or 6 , wherein the workpiece is a hot slab manufactured by continuous casting. The hot working method according to any one of claims 5 to 7 , wherein the hot working is a cutting work on a surface of the workpiece.

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