JP4366825B2 - Crop shear for joining, hot rolling equipment line and hot rolling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a cropping joint for steel slabs (refers to a cropper used for cutting off the crops at the ends of steel slabs when joining the ends of steel slabs together), hot rolling. With regard to the equipment row and the hot rolling method, it is intended to realize a stable operation by minimizing the warp generated in the steel slab conveying process.
[0002]
[Prior art]
On the entry side of the finish rolling mill, the equipment line of hot rolling that can join the preceding rolled material and the subsequent rolled material and finish-roll several to dozens of rolled material continuously is as follows. A configuration in which a winding, unwinding device, leveler, joining cropper, joining device, and cropping device are sequentially arranged between the finish rolling mill and the rough rolling mill disposed upstream from this. It is common to become. Furthermore, the installation which installed the heating apparatus which heats a steel piece between the said joining apparatus and the said cropper is also proposed.
[0003]
In such an equipment row, when continuous finish rolling of a steel slab is performed, the unrolled steel slab is flattened by a leveler, and then the front and rear ends of the steel slab are crop-cut by sha, The joining device is used to join the trailing edge of the preceding steel slab and the leading edge of the succeeding steel slab, and the heating device selectively heats the portion of the steel slab where the temperature has decreased, and then finishes it in the finish rolling mill. I try to guide you.
[0004]
In addition, when steel slabs are processed as batch materials in such an equipment row (herein, batch material refers to the case where steel slabs are finished and rolled one by one) It is not carried out, it is passed without using the joining cropper and the joining device, and the finish rolling mill is cut off at the front and rear ends of the steel slab by the cropper arranged just before the entrance of the finishing mill. To be guided to. In addition, when a heating device is arranged between the joining device and the cropping device, the steel piece is guided to the cropping device after the temperature is locally increased in the heating device with a temperature drop. Is done.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 7 showing the configuration of the joining cropper 4 described above, a crop composed of a pair of upper and lower rotating drums 14 having cutting blades 13 attached to the outer peripheral surface and a frame 15 that supports the rotating drums. It has a main body 15 and an output apron 11 that is disposed on the outlet side of the crop main body 15 and has a support 11a that supports a steel piece (rolled material) 16 through which the crop main body 15 is passed from below. . The outlet apron 11 has a structure in which the support 11a is inclined at an inclination angle of about 30 ° toward the upstream side downward direction so as to ensure a space A for dropping the cut crop downward. .
[0006]
In continuous hot finish rolling, the steel slab is rewound at a relatively low speed in order to secure the time for joining, and the plate passing speed when passing through the joining cropper is about 120 mpm at the maximum. Although there is no particular problem, when the steel slab is processed as a batch material, the plate passing speed is 150 mpm or more, and the highest speed is as high as 350 mpm. When the tip of the steel collides with the apron on the exit side, a large warp (upward warp) may occur at that time, which may hinder the subsequent finish rolling, and particularly when the above-described heating device is provided. However, from the viewpoint of heating efficiency, it is impossible to pass a heating device having a very small frontage, and it is necessary to evacuate the heating device from the line, which increases useless time. It may adversely affect inconvenient for the production of, and if woefully severe, there is a problem such as the tip of the steel pieces would defeat such collides device to the heating device.
[0007]
[Problems to be solved by the invention]
The object of the present invention is to propose a joining cropper, a hot rolling equipment row, and a hot rolling method that can solve the above-mentioned problems that have occurred when the steel slabs are processed as batch materials that are individually passed through. It is in.
[0008]
[Means for Solving the Problems]
That is, this invention concerning Claim 1 is arrange | positioned at the entrance side of the steel piece joining apparatus which joins the rear-end part of a preceding to-be-rolled material, and the front-end | tip part of a transition material to be rolled, A cropping cutter for cutting the crop at the tip of the part and the subsequent rolled material, and having an outlet apron having a support for supporting the rolled material from below, on the outlet side of the cropped body. The exit apron is characterized in that an inclination angle of the upstream support toward the upstream downward direction of the upstream support can be changed to 10 ° or less or 30 ° or more .
[0009]
Further, the present invention according to claim 2, prior disposed entrance side of the steel slab joining apparatus for joining the distal end portion of the rear end and the following material to be rolled in the rolled material, after the preceding material to be rolled Crop shear for joining which cuts the crop of the end portion and the tip portion of the subsequent rolled material, and has an output side apron which can be pushed out to the output side of the cropped shear body having a support for supporting the material to be rolled from below. And when the exit apron is pushed into the crop body main body exit side, the inclination angle toward the lower side on the upstream side of the support is 10 ° or less with respect to the pass line of the material to be rolled. It is characterized by becoming.
[0010]
Furthermore, the present invention according to claim 3 is a hot rolling equipment row in which a joining cropper and a steel piece joining device are arranged from the upstream side to the inlet side of the hot finish rolling mill, The joining cropper is the joining cropper according to claim 1 or 2.
[0011]
Here, it can have a heating apparatus which heats a steel piece between the said steel piece joining apparatus and the said hot finish rolling mill. Furthermore, in this case, it is particularly preferable to have a guide for guiding the steel slab into the heating device above the entrance side of the heating device.
[0012]
Moreover, this invention concerning Claim 6 is hot rolling using the hot rolling equipment row | line | column which arrange | positions the cropper for joining and the steel piece joining apparatus from the upstream to the entrance side of a hot finish rolling mill. In the method, the material to be rolled can be supported from below by an output apron in which the inclination angle of the support body directed downward at the upstream side is 10 ° or less on the output side of the cropper body of the joining cropper. In this state, the material to be rolled is passed through the bonding cropper without cutting the tip of the material to be rolled by the bonding cropper, and then the material to be rolled to the hot finish rolling mill. And batch rolling.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, when processing a batch material to strip passing a steel strip in 150mpm or faster at the outlet side of the crop Sha disposed entrance side of the steel strip joining apparatus, supporting the front end of the steel strip Since the tip side of the steel slab collides with the output side apron because it is supported by the output side apron whose angle of inclination toward the upstream side of the body is 10 ° or less with respect to the conveyance path line, warping occurs. It never happens.
[0014]
Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 schematically shows a configuration of a hot rolling equipment train according to the present invention. In the figure, 1 is a rough rolling machine, 2 is a steel bar such as a sheet bar, and a rewinding and unwinding device, 3 is a leveler for flattening the unrolled steel slab, and 4 is a crop for joining. As shown in FIG. 2, the crop shear 4 has a steel piece to be conveyed on the exit side of the crop shear body 15 having the same configuration as that shown in FIG. An output apron 17 for supporting from below is disposed, and the output apron 17 has a steel piece support 17a capable of changing the inclination angle θ toward the lower side on the upstream side. That is, the support body 17a can move up and down around a rotating shaft 17c provided at a downstream position of the output apron. And the inclination | tilt angle (theta) toward the upstream lower side of this support body 17a can be set to 10 degrees and 30 degrees with respect to the pass line P of a steel piece.
[0015]
Reference numeral 5 denotes a joining device, and the joining device 5 can heat and join the rear end of the preceding steel slab and the front end of the succeeding steel slab while running.
[0016]
Reference numeral 6 denotes a heating device (induction heating or the like) used when raising the temperature of the whole or a part of the steel slab, and 7 is a guide disposed on the entrance side of the heating device 6. The guide 7 is a steel slab. It has a function of correcting the upward warping at the tip of the lead and guiding it into the heating device.
[0017]
Reference numeral 8 denotes a cropper for cutting the front and rear end crop parts when processing the steel slab as a batch material, 9 is a descaling device, and 10 is a finish rolling mill.
[0018]
As shown in FIG. 7, the side face of the conventional type cropper is arranged so that the outlet apron 11 disposed on the outlet side faces downward with respect to the conveyance path line P from the viewpoint of prompt discharge of the cropped portion. It is arranged at a fixed angle of 30 °, and when the steel sheet is conveyed and passed at a high speed in order to treat the steel slab as a batch material, its tip collides with the outgoing apron 11 and the warpage occurs. It was inevitable.
[0019]
In the present invention, when passing a steel piece at a speed of 150 mpm or more, the inclination angle θ of the support 17a of the outlet apron 17 is set 10 ° upstream of the tip of the steel piece with respect to the transport path line P. It is possible to support downward toward the side, and thereby, it is possible to suppress a large upward warp that has conventionally occurred, and it is possible to smoothly convey a steel piece.
[0020]
On the other hand, when the leading steel piece and the trailing steel piece are joined, when the leading end of the steel piece is cut using the joining cropper 4, the inclination angle of the support 17a of the outlet apron 17 is set to 30. If set to °, cropping will not be disturbed.
[0021]
In the above-described embodiment, the inclination angle of the support 17a can be set to 10 ° and 30 ° . However, the present invention is not limited to this, and the side of the cropper 4 at the time of not using the joining cropper is used. The setting of the inclination angle can be freely selected according to the warp occurrence state and the crop discharge state when the joining cropper is used. However, according to the investigation results of the present inventors, when passing the tip of the steel slab at 50 mpm or more, the inclination angle θ needs to be 10 ° or less. It was found that when the tail end is sheared and the crop is discharged downward, the inclination angle must be 30 ° or more. Therefore, the inclination angle of the support 17a needs to be changeable to 10 ° or less or 30 ° or more . In addition, the inclination angle of the support 17a can be set to 2 ° or more in order to smoothly pass the steel piece without passing the tip when the tip of the steel piece is passed without using the cropping joint. preferable. Further, when cutting the leading end of the steel slab with the joining cropper, the support 17a can be used to ensure that the steel strip is discharged downward and the steel slab tip does not stick. Is preferably set to 45 ° or less.
[0022]
FIG. 3 shows another configuration example of the cropper 4 that can be arranged in the hot rolling equipment row according to the present invention on the side surface.
[0023]
In such a cropsha 4, the conventional output apron 11 is arranged as it is, and a separate output apron 18 is connected to the insertion / removal mechanism 12 including the hydraulic cylinder s and the link L to support the output side. The body 18a itself is moved up and down by the operation of the insertion / removal mechanism 12 so that it can be brought online or offline. By arranging the outgoing apron 18 having such a configuration, a steel piece can be obtained as necessary. Can be accurately supported. Such an output apron 18 also has its support 18a inclined downward on the upstream side, and an inclination angle θ with respect to the transport path line P is 10 ° or less.
[0024]
In the removable apron 18 of the type shown in FIG. 3 above, the inclination angle θ of the support 18a may be fixed, but it may be variable. Moreover, although the insertion / removal mechanism of FIG. 3 was shown as an example which can be moved up and down, this may be a swing type, for example, and the type is not particularly limited. The raising / lowering amount may be set so that there is no hindrance to the passing plate of the billet when the outlet apron 18 is taken offline.
[0025]
By configuring the joining cropper as described above, the amount of warpage of the steel slab can be reduced even if the tip of the steel slab is made to pass through at high speed, especially when the above-described heating device is provided. In this case, the effect of avoiding the trouble of passing through the plate is tremendous.
In addition, when providing the heating apparatus 6, the guide 7 can be added to the entrance side.
[0026]
As shown in FIG. 4, the guide 7 is enlarged to 5 ° to 30 ° downward with respect to the pass line so that it can be guided and guided into the heating device by correcting the warp at the tip of the steel slab. ° angle theta ₂ good idea to provide a, its installation position is placed appropriately in accordance with the thickness or the like of the billet.
[0027]
【Example】
In the rolling equipment example shown in FIG. 1 above, the cropping shaft as shown in FIG. 2 is arranged so that the inclination angle θ of the support 17a of the output apron 17 is 10 ° (conformance example 1) and 2 ° (conformance). Example 2) and a case where a cropper having an output apron in which the inclination angle θ of the support is fixed at 30 degrees is arranged on the output side of the cropper body as shown in FIG. 3 (comparative example). Sheet bar warpage when the rolled material (sheet bar) after rough rolling with a thickness of 27 mm to 45 mm and a temperature of 900 ° C. to 1100 ° C. is fed as a batch material one by one at a speed of 40 mpm to 350 mpm The situation of occurrence was investigated.
[0028]
FIG. 5 shows the result. In the comparative example of the conventional type, even when the sheet bar passing speed is less than 150 mpm, the amount of warpage at the end of the bar is as large as 50 mm (the amount of warpage increases as the plate thickness decreases). ), Because it is larger than the opening of the heating device 6, it is impossible to pass through.
[0029]
On the other hand, in the conforming examples 1 and 2, even when the sheet passing speed is about 250 mpm, the warpage of the sheet bar is smaller than the opening of the heating device, and the sheet passing stability is remarkably improved.
[0030]
FIG. 6 shows a guide that guides and guides the upper end of the sheet bar at the entrance side of the heating device, and guides and guides it into the heating device (with a 2 ° angle downward) at a height of 65 mm from the pass line. The result of having investigated the usefulness at the time of providing about the example 2 of conformity is shown.
[0031]
As is clear from FIG. 6, by providing such a guide, it was confirmed that the warping of the sheet bar can be stably passed because it stays at about 30 mm even at a high speed passing plate exceeding 300 mpm and is smaller than the opening of the heating device.
[0032]
【The invention's effect】
According to the present invention, it is possible to suppress warpage (upward warpage) that has occurred in high-speed threading when steel slabs are processed as a batch material, so that not only the frequency of equipment evacuation due to such warpage is drastically reduced. In addition, there is no damage to equipment and stable operation can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of an equipment row according to the present invention.
FIG. 2 is a side view of a cropper arranged in an equipment row according to the present invention.
FIG. 3 is a view showing another example of the cropper arranged in the equipment row according to the present invention.
FIG. 4 is a view showing a side surface of a guide.
FIG. 5 is a diagram showing the relationship between warpage and plate passing speed.
FIG. 6 is a graph showing the results of investigating the effectiveness of guide installation.
FIG. 7 is a side view of a cropper arranged in a conventional equipment row.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coarse rolling mill 2 Winding rewinding device 3 Leveler 4 Crop shear for joining 5 Steel piece joining device 6 Heating device 7 Guide 8 Crop shear 9 Descaling device 10 Finishing rolling mill 15 Cropsha main body 16 Steel slab (rolled material)
17 Output side apron 17a Support body 17c Rotating shaft 18 Output side apron 18a Support body P

Claims (6)

It is arrange | positioned at the entrance side of the steel piece joining apparatus which joins the rear-end part of a preceding to-be-rolled material, and a subsequent to-be-rolled material, The crop of the rear-end part of the said to-be-rolled material and the front-end | tip part of a following to-be-rolled material A cropping joint for cutting,
An exit apron having a support that supports the material to be rolled from below, on the exit side of the cropsha body,
The output apron is made of a joint cropper characterized in that an inclination angle of the support body in the downward direction on the upstream side can be changed to 10 ° or less or 30 ° or more . It is arranged on the entry side of the steel piece joining device for joining the rear end portion of the preceding rolled material and the front end portion of the subsequent rolled material, and the rear end portion of the preceding rolled material and the leading end portion of the subsequent rolled material A cropping cutter for cutting a crop,
A pull-out apron having a support body supported from the lower side of the material to be rolled is provided on the outlet side of the cropsha body, and when the outlet apron is pushed into the outlet side of the cropsha body, the support is provided. Crop shear for joining, characterized in that an inclination angle toward the lower side on the upstream side of the body is 10 ° or less with respect to a pass line of the material to be rolled. On the upstream side of the hot finish rolling mill, from the upstream side, it is a hot rolling equipment row formed by arranging a cropping shear for joining and a steel piece joining device,
3. The hot rolling equipment row according to claim 1, wherein the joining cropper is the joining cropper according to claim 1 or 2.   4. The hot rolling equipment train according to claim 3, further comprising a heating device for heating the material to be rolled between the steel slab joining device and the hot finish rolling mill.   The hot rolling equipment row according to claim 4, further comprising a guide for guiding the material to be rolled into the heating device above the entrance side of the heating device. On the upstream side of the hot finish rolling mill, from the upstream side, it is a hot rolling method using a hot rolling equipment line in which a cropping shear for joining and a steel piece joining device are arranged,
In the state where the material to be rolled can be supported from the lower side in the output side apron with the inclination angle of the support facing the lower side on the upstream side being 10 ° or less, on the exit side of the cropper body of the joining cropper, The material to be rolled is allowed to pass through the joining cropper without cutting the tip of the material to be rolled by the joining cropper, and then the material to be batched by the hot finish rolling mill. A hot rolling method characterized by rolling.

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