JP3440268B2 - Multi-straightening and cutting system in a strip rolling line - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple strip straightening / cutting system for a strip steel rolling line.

[0002]

2. Description of the Related Art A rolled steel bar rolled in a rolling mill generally reaches a length of several tens of meters to several hundreds of meters. However, since the product after rolling flows to the next cooling step, the length of the cooling floor is reduced. To a suitable length and cooled.
After cooling, the divided products may be cut and straightened again off-line, but in modern rolling mills, the main method is to straighten the product after cooling and then cut it into product lengths. Occupy

FIG. 36 is an explanatory view for explaining the outline of a general in-line straightening / running / cutting system for a steel strip rolling line. In the figure, 51 is a multiple-stripe straightening machine arranged on the outlet side of the cooling floor, 52 is an inter-machine table, 53 is a first measuring ring installed downstream of the multiple-strip straightening machine 1, and 54 is a first measure. The steel bar which is installed on the downstream side of the ring roll 53 and has slipped through the straightening straightener 51 is used as an engine table 52.
It is a pressing roller that presses to the side.

Reference numeral 55 denotes a traveling cutting machine installed on the downstream side of the entry side pressing roller 54, and 56 denotes a second measuring ring installed on the downstream side of the traveling cutting machine 55. Reference numeral 57 is a delivery side pressing roller installed downstream of the second measuring roll 56, and 58 is a rear face tilting table installed downstream of the delivery side pressing roller 57.

Further, (a) (b) (c) in FIG.
Shows the rear end of the steel strip to be straightened and cut in chronological order. (A) shows (n-) two cuts before the final cutting (n cutting).
2) Off, (b) is (n-
1) indicates off, and (c) indicates final off (n off). The product length is indicated by L and the rear end crop length is indicated by l _c .

Next, the cutting operation of the rear end of the steel strip will be described with reference to FIG. In the (n-2) cut state shown in (a), the steel strip is constrained by the multi-strand straightening machine 51 and sent out to the downstream side, cut into the product length L by the traveling cutting machine 55, and the remaining length is 2L + 1.
_c . The rear tilting table is tilted (tilted) in the cutting direction so that the steel bar is not bent during cutting. In the state of (n-1) cutting shown in (b), the steel strip is still constrained by the multi-strand straightening machine 51, and the traveling cutting machine 55.
In the remaining manager after cutting becomes L + l _c.

After that, since the rear end of the strip steel slips out of the multiple strip straightening machine before n cutting, before the strip steel slips out of the multiple strip straightening machine 51, the strip steel is first engineed by the entry side pressing roller 54. While being pressed against the table 52 side, it is sent to the downstream side in synchronization with the multi-strand straightening machine 51, and after the steel strip has slipped out of the multi-strand straightening machine 51, it is sent to the downstream side by the restraining force of only the entry side pressing roller 54 . Then, as soon as the head of the final cut product (length L + l _c ) is sent to the position of the delivery side pressing roller 57, this is immediately moved by the delivery side pressing roller 57 to the rear face tilting table 58.
Make a final n cut by pushing to the side.

Here, the reason why the steel strip is restrained by the entrance side pressing roller 54 and the exit side pressing roller 57 will be described.
The steel strip that has passed through the multi-strand straightening machine 51 is arranged so as to be conveyed out by the inter-machine table 52 and the rear face chilling table 58. However, in the conveyance between the inter-machine table 52 and the rear face chilling table 58, the actual feed is performed. Since the speed cannot be controlled and a speed difference occurs between the parallel steel strips that have passed through the multi-strand straightening machine 51, it becomes extremely difficult to cut the n-cut to within an allowable accuracy. Therefore, the steel strip that has passed through the multi-strand straightening machine 51 is provided with the inlet side pressing roller 54 and the outlet side pressing roller 5
Restrained by 7 and speed difference (deviation) between parallel steel bars
Is not occurring.

[0009] As described above, in order to accurately cut the multi-section steel up to the final cutting (n), a means is required before and after the traveling cutting machine 55 to feed the section steel while restraining it. On the other hand,
In order to restrain and cut the bar steel, it is necessary to move the tip side of the bar steel in the same direction as the blade at the time of cutting in order to prevent bending of the bar steel during cutting, and the rear face tilting table 58 is installed. It has been done.

FIG. 37 shows the above-mentioned in-line straightening /
It is an explanatory view of a system which is a concrete example of a traveling cutting system and is adopted by Company P. In the figure, parts having the same functions as those in FIG. 36 are designated by the same reference numerals. Hereinafter, a particularly characteristic one of the respective configurations will be specifically described based on FIG.

First, the traveling cutting machine 55 will be described.
The traveling cutting machine 55 adopted by Company P is of a type called a crank type shear. This crank type shear is provided with a pair of crank shafts above and below the product pass line, and crank arms are rotatably fitted to the shafts, respectively, and the crank arms are centered around the fitting portion. It has a key shape that is upside down and opposite. Then, one end of the key-shaped crank arm forms a blade holder for mounting a blade, and the other end is pivotally supported by a fan-shaped swingable arm.

The pair of crankshafts is rotated by a single driving device via gears, and when the crankshafts are rotated, the blade holder of the crank arm fitted to the crankshafts is vertically symmetrical with respect to the pass line. Perform an elliptical motion on Tsukku. Then, in one cycle of this movement, the product is cut by opening, closing and opening while running the upper and lower blades.

The upper and lower blades used in the traveling cutting machine 55 are open blades which are separately attached to the blade holders of a pair of crank arms, and can be opened and closed (moved up and down) in one revolution of the crankshaft. To do. FIG. 38 shows an example of this open blade. 38 (a) is an open blade for angle steel, FIG. 38 (b) is an open blade for channel steel, and FIG. 38 (c) is an open blade for H-section steel. 39 is a cross-sectional view taken along the line AA in FIG. As can be seen from FIG. 39, the upper and lower knives are independent and are separately attached to the cutting machine (shearing machine) so that the respective knives can overlap each other. The blade opens and closes (elevates) only in the vertical direction when viewed from the cut surface of the product.

FIG. 40 is a diagram showing another specific example of the in-line straightening / running / cutting system, which is adopted by Company D. The traveling cutting machine 55 adopted by company D
Is a pen drum type (pendulum type) shear. The pen drum type shear is composed of a crankshaft drive device for opening and closing a blade and a drive device for rotating a crankshaft different from the above for swinging a pen drum (pendulum) back and forth for traveling cutting. ing.

The blade is housed inside the pendulum, the lower blade is fixed on the base of the bottom of the pendulum by open blades for upper and lower, and the upper blade is attached to the ram connected to the crank arm for opening and closing the blade. Open and close (elevate).

In the system of Company D, the pressing roller is not used, and the product before "n-cut" after the straightening of the straightening machine is transported by a roller (table) with a built-in permanent magnet.
It is configured to.

[0017]

There are various problems in the conventional in-line straightening / running / cutting system configured as described above, and these problems will be described separately below. 1. Problems related to traveling cutting machine (1) Squareness of cutting surface In the case of the conventional crank type shear adopted by Company P, it is the cutting during the elliptical motion of the crank arm, and in the case of the pen drum type shear adopted by Company D Since the cutting is during the swing of the pendulum, the cutting angle in the longitudinal direction of the product is not constant in both cases, and the cutting starts from "90 ° -α ° (or 90 ° + α °)" and is completed at 90 °. Become. Therefore, the angle of the cut surface cannot be geometrically 90 °, the crank type shear adopted by P company has an uneven shape as shown in FIG. 42, and the pen drum type shear adopted by D company is shown in FIG. It becomes convex as shown. Such cut surfaces are never acceptable in the domestic market where quality is severe.

(2) Deformation of Cut Surface Both the crank type shear and the pen drum type shear are vertical guillotine shears with an open blade as shown in FIG. 38, and the blade (upper blade and / or lower blade) is a product. Seen from the traveling direction of, the product moves vertically to the product regardless of the shape of the product.

At this time, in the case of the angle steel shown in FIG. 38 (a), the blade moves vertically, but since it has an angle of 45 ° with respect to the product, the minimum plate from the start of cutting to the completion of cutting. It will be cut in thickness. Therefore, the cut surface of the angle steel is not deformed and is commonly used in Japan.

However, FIG. 38 (b) and FIG.
In the case of channel steel or H-shaped steel shown in (c), when the blade is moved vertically, the flat web portion is thin and does not deform, but the flange portion formed perpendicular to the web is several times thicker. Since it will be cut in the height direction, the part will buckle from the cutting start point to the cutting completion point,
There is a problem that it is combined with the above-mentioned concave / convex shape of the cut surface to cause S-shaped deformation as shown in FIG.

2. Problems with Press Roller When using the press roller of Company P to press the steel bar against the engine table or the rear table side, or the method of restraining the steel bar with the magnet roller of Company D, all of the multiple rows of steel bar are firmly secured. Therefore, there is a problem in that variations occur due to the deviation of the steel strip, which is not well sandwiched.

This point will be described more specifically. In the case of the pressing roller system, as shown in FIG. 44, it has a structure like a vertically opposed type pinch roller, but the lower roller is a flat table roller 58 that conveys all products.
It is also used as a (roller of the rear chilling table), and the surface becomes wavy due to wear. Furthermore, even if the product shape and dimensional error adverse conditions overlap and each product is sandwiched, FIG.
As shown in (a) and (b), point contact occurs, and gaps such as c, d, and e surrounded by circles in the figure occur between the product and the pressing roller 57. Further, in the case of a magnet roller, in addition to wear of the roller, instability of the restraining force of the magnet causes deviation of the product.

The present invention has been made in order to solve the above problems, and it is a multi-row straightening / running method in a steel strip rolling line in which the cut surface is not deformed and the product length of the final cut does not vary. The purpose is to get a cutting system.

[0024]

A multi-strand straightening / cutting system in a steel strip rolling line according to the present invention is provided with an orthogonal wafer.
A multi-start straightening device for multi-start straightening the long steel consisting blanking and the flange, is installed on the downstream side of the multi-strip straightening device, guided to the downstream side sandwiching the long steel wherein are corrected by the multi-condition correction device An entrance-side guide pinch roller, and a stationary blade and a movable blade that are installed on the downstream side of the entrance-side guide pinch roller and have a plurality of hole shapes that match the cross-sectional shape of the bar steel, For web and flange in cross section
And a multi-row running cutting device that cuts the bar while moving diagonally, and a delivery-side guide pinch roller that is arranged on the downstream side of the multi-row running cutting device and holds the bar, And a rear face tilting table that tilts in the moving direction of the blade in synchronization with the movement of the blade of the multi-row running cutting device.

Further, the inlet side guide pinch roller and the outlet side guide pinch roller are arranged between two first rollers arranged at a predetermined distance in the flow direction of the steel strip, and between the first rollers. One of the second rollers is provided, and the steel strip is sandwiched between the first roller and the second roller.

Further, the distance between the two first rollers can be adjusted.

The distance between the inlet guide pinch roller and the outlet guide pinch roller is determined from the product length after the tip of the bar steel reaches the position of the outlet guide pinch roller. The length is set to be shorter than the length obtained by subtracting the distance traveled by the bar until the roller clamps the leading end of the bar.

Further, a stopper for restricting the amount of reduction of the second roller is provided.

Further, before the strip steel slips out of the multi-strand straightening device, the strip steel is sandwiched by the entrance-side guiding pinch rollers and sent to the multi-strip running cutting device side, and the leading end side of the strip steel is guided to the exit side. When it is fed to the position of the pinch roller, the strip steel is sandwiched between the output guide pinch rollers, and then the input guide pinch roller is released.

Further, the rear tilting table is
The multi-row running cutting device is provided with a plurality of tilting direction defining means capable of defining a tilting direction according to the moving direction of the blade, and the plurality of tilting direction defining means can be used by switching according to the moving direction of the blade. It is the one.

The fixed blade is composed of at least two blades forming a hole shape, and these two blades are configured to be movable relative to each other. The cutting is performed by a moving blade.

[0032]

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is an explanatory view of an embodiment of the present invention, showing an in-line straightening / cutting system of a hot-rolled steel rolling line. In the figure,
1 is a multi-strand straightening machine arranged on the outlet side of the cooling floor, 3 is a first measuring roll installed downstream of the multi-strip straightening machine 1, and 5 is a downstream side of the first measuring ring 3. It is an inlet side induction pinch roller for sandwiching the steel strip that has slipped through the straightening straightener 1. The entrance-side guide pinch roller 5 includes two lower rollers 5a and 5b and these lower rollers 5a and 5b.
It is composed of three rollers, an upper roller 5c arranged above a and 5b. The details of the entrance-side guide pinch roller 5 will be described later.

Reference numeral 7 is a multi-running cutting machine installed downstream of the entry-side guide pinch roller 5, and 9 is a second measuring roll installed downstream of the multi-running cutting machine. Denoted at 11 is a delivery-side guide pinch roller installed downstream of the second measuring roll 9.
1 has the same structure as the entrance-side guide pinch roller 5, and 2
Lower rollers 11a and 11b, and the lower rollers 11
It is composed of three rollers, that is, an upper roller 11c arranged above a and 11b. Reference numeral 13 denotes a rear surface chilling table which is installed on the downstream side of the output side induction pinch roller 11, and the downstream side of the rear surface chilling table 13 is connected with a trimming equipment.

FIG. 2 shows the multi-row running cutting machine 7 shown in FIG. 1 and the entry / exit induction pinch rollers 5, 1 arranged in front of and behind it.
It is an enlarged view which shows an example of 1. The configuration of the multi-row running cutter 7 will be described below with reference to FIG. Multi-row cutting machine 7
Is a blade set 90 in which a movable blade 91 and a fixed blade 92 are set, a cutter driving device 70 that drives the movable blade 91 of the blade set 90, and a blade set moving device that moves the blade set 90 in the product moving direction. And 80.

The blade set 90 has a fixed blade 92 installed therein and a movable blade 91 which is in contact with the fixed blade 92 and is shearable together with the fixed blade 92.
A knocker 93 is provided on the upper part of the. The cutting machine driving device 70 is composed of a rectangular ram 74 attached to a casing so as to be vertically movable, connecting rods 73a and 73b for vertically moving the ram 74, crank arms 72a and 72b, and crankshafts 71a and 71b. Has been done.

The tool set moving device 80 includes a tool set base 81 on which the tool set 90 is installed, a rack 82 integrally installed on the tool set base 81, a pinion 83 meshing with the rack 82, and a tool set. The base 81 includes a blade set base travel rail 84 movably installed.

The multi-row running cutting machine 7 configured as described above
The operation of is outlined. From the cutting point, the product is measured by the measuring roll 9, the blade set 90 is accelerated by the blade set moving device 80, and runs at the same speed as the product. Then, when the length measurement reaches a preset product length, the cutting machine driving device 70 is driven and the ram 74 descends to hit the knocker 93 and move the moving blade 91 to cut the product. After cutting
The tool set moving device 80 decelerates and stops, and the tool set 90
Return to the original starting position within the cutting cycle.

According to such a multi-row running cutter 7, since the blade is always in contact with the product in a direction at a right angle, it is possible to solve the conventional problem concerning the perpendicularity of the cut surface.

Next, the structure of the blade set 90 will be described. As shown in FIG. 38, the blade in the conventional example is an open blade, and the moving direction of the blade is only the vertical direction as seen from the flow direction of the product regardless of the shape of the product. As described above, with such a blade, the angle steel can be cut with good quality, but other groove steels and H (I) steels are deformed. Therefore, in the present embodiment, a closed blade (hole-shaped blade) is used, and as shown in FIG. 3, angle steel (vertical cutting) and channel steel H (I) shaped steel (oblique cutting) are used for cutting directions. By changing to a rational direction, each product shape can be cut reasonably and reasonably. Here, the rational direction is a direction in which the average plate thickness (cutting distance) is minimized with respect to all cut surfaces.

FIG. 4 is a side view showing the blade set 90 in a partial cross section, and FIG. 5 is a front view. Here, a blade set 90 for three channel steels is illustrated. In FIGS. 4 and 5, reference numeral 100 denotes a grooved rope of the material to be cut, and each grooved rope is inserted into the blade set 90 in a normal posture and in parallel. The fixed blade 92 has a hole shape 92 adapted to the sectional shape of the channel steel 100.
a is provided. The movable blade 91 has a hole shape 91a having the same shape and size as the hole shape 92a of the fixed blade 92,
Each movable blade 91 can be moved diagonally downward to the left. Reference numeral 95 is a guide block that regulates the moving direction of these moving blades 91. Reference numeral 96 is a return spring provided below each movable blade 91 for returning each movable blade 91.

The fixed blade 92 is fixed to the blade set 90,
Each movable blade 91 is provided on the front surface of the fixed blade 92 between a plurality of guide blocks 95 fixed to the fixed blade 92,
Move in the defined direction. This movement is performed by pushing down the knocker 93 by the ram 74. by this,
The three channel steels 100 can be obliquely cut at the same time.

As described above, according to the blade set 90 of the first embodiment, the product can be instantaneously cut with the average minimum plate thickness of each surface while keeping the product in the normal posture. Therefore, the S-shaped deformation as shown in FIG. 43 in the conventional example does not occur.

Next, the inlet / outlet side pinch rollers 5 and 11 introduced to solve the problem that the product length varies in the final n-cut will be described. First, the arrangement of the inlet guide pinch roller 5 and the outlet guide pinch roller 11 will be described with reference to FIG. Since the exit-side guide pinch roller 11 pinches what has slipped out of the entrance-side guide pinch roller 5, the narrower the distance between the two, the better.
Since a multi-row cutting machine 7 is installed between the two, there is a limit naturally. However, in order to satisfy the condition of always pinching the steel bar, there is an absolute condition that the maximum distance between them is determined by the shortest product length to be cut and must be at least less than this.

That is, if the product length is L, the distance between them is represented by L-α. Here, α is defined as the length that the product runs after the leading end of the steel strip reaches the position of the delivery-side guide pinch roller 11 and before the upper roller 11c of the delivery-side guide pinch roller 11 descends and sandwiches the steel strip. It is what is done. Generally, if the shortest product length is L _MIN , the distance between the entrance and exit pinch rollers 5 and 11 is L _MIN- (1.0 m to
Within 1.4 m)

Next, the construction of the input / output side pinch rollers 5 and 11 will be described. FIG. 6 is an explanatory diagram of the entrance-side guide pinch roller 5. The left guide pinch roller 11 is opposite to the left guide pinch roller 5 in the left-right direction, but the other configuration is the same as the left guide pinch roller 5. The entrance side guide pinch roller 5 is the two lower rollers 5 as described above.
It is composed of three rollers a, 5b and one upper roller 5c. The upper roller 5c descends only during use to sandwich the bar steel between the lower rollers 5a and 5b.

The lower rollers 5a and 5b are installed at a level at which the steel strip horizontally runs between the upstream multiple-strip straightening machine 1, the downstream multiple-strip running cutting machine 7 and the cutting machine rear roller table 13. Further, the two lower rollers 5a and 5b are configured so that the distance between them can be adjusted. Upper roller 5c is arm 2
It is attached to the front end side of 0, and the arm 20 is rotatably attached to the fixed side at an intermediate portion 21 thereof. 23
Is an expandable and contractible hydraulic actuator that is installed on the fixed side and has a distal end side connected to the arm 20. By driving this hydraulic actuator 23, the arm 20 rotates about the intermediate portion 21. The upper roller 5c moves up and down. Also, the hydraulic actuator 2
By adjusting the hydraulic pressure of 3, it is possible to adjust the pressing force of the upper roller 5c, and it is possible to adjust the pinch force to match the product size.

Reference numeral 25 is a reduction adjusting stopper, which is used for the arm 20.
By restricting the rotation of the base end side of the above, the lowering limit position of the upper roller 5c can be adjusted, and the reduction amount ΔH can be arbitrarily determined. Here, the reduction amount ΔH is a value that is determined for each type of product, and must be at least the following value or more in order to firmly sandwich all the multi-row steel bars. That is, when the target product thickness is t mm and the thickness of the product rolled with the maximum allowable roll gap is t _max mm,
The difference between the product thickness t mm and t _max mm needs to be at least Δt (t _max −t).

However, if the stress generated in the product exceeds the yield point when the product is sandwiched by the reduction amount ΔH, plastic distortion occurs in the product, and the product suitability is lacking. Therefore, it is necessary to secure the amount of reduction ΔH and prevent the stress generated in the product from exceeding the yield point.
In this regard, in the present embodiment, the lower rollers 5a, 5b
By adjusting the distance between them, the stress generated in the product can be easily adjusted so as not to exceed the yield point. In short, if the reduction amount ΔH is set by the stopper 25 for each type of product and the distance between the lower rollers 5a and 5b is set to a predetermined length, the pressing force of the upper roller 5c can secure the reduction amount ΔH. It is sufficient if it is at least as high as possible, and fine pressure adjustment is unnecessary.

However, as a method of ensuring the amount of reduction ΔH and preventing the stress generated in the product from exceeding the yield point, the distance between the lower rollers 5a and 5b is fixed and the amount of reduction is set at that distance. It is also possible to measure the pressing force that can secure ΔH and do not exceed the yield point, and adjust the pressing force of the upper roller 5c so as not to exceed this measured value.

By using the guide pinch roller 5 on the entrance side having the above-mentioned structure, a large number of steel strips having different thicknesses can be simultaneously sandwiched, and at most 1 mm per 1 m of traveling.
It is possible to feed the steel strip at a substantially constant speed within an error within the range. That is, by rolling down the steel strip arranged between the two lower rollers 5a and 5b by the upper roller 5c, the steel strip is bent to some extent, and there is a difference in thickness between the multiple steel strips. Even if it does, all the steel strips will be securely sandwiched.

7 to 9 are explanatory views of the positional relationship between the lower rollers 5a and 5b and the upper roller 5c. FIG. 7 shows a standby state, and the upper roller 5c is arranged above the lower rollers 5a and 5b. FIG. 8 shows the upper roller 5c and the lower roller 5
It is placed in the middle of a and 5b to show the use state. Further, FIG. 9 shows a use state in which the upper roller 5c is arranged closer to the lower roller 5a by moving the lower rollers 5a and 5b from the state shown in FIG. in this way,
The relative positions of the upper roller 5c and the lower rollers 5a and 5b can be arbitrarily changed, and the nipping can be appropriately performed according to the type of bar steel.

Next, the cutting process of the steel strip using the above-mentioned inlet / outlet side guide pinch rollers 5, 11 will be concretely described with reference to FIG. Assuming that the bar steel on the cooling floor is cut into n products of product length L, (a) in FIG.
The figure shows (n-2) cut, the (b) shows (n-1) cut,
(C) The figure shows each of n cuts. Further, the product length is L, the crop length of the rear end is l _c. In the state of (n-2) cutting shown in (a), the strip steel is restrained by the multiple strip straightening machine 1 and sent out to the downstream side, cut into the product length L by the multiple strip running cutting machine 7, and the remaining part length becomes 2L + l _c.

In the state of (n-1) off shown in FIG.
Long products is restrained yet by multiple-start straightening machine 1, the remaining director after cutting in multiple-start an inter-running cutter 7 becomes L + l _c. After that, since the rear end of the strip steel slips out of the multi-strand straightening machine before n cutting, before the strip steel slips out of the multi-strand straightening machine 1, first it is pinched by the entry-side guide pinch roller 5, and at first It is fed to the downstream side in synchronism with the strip straightening machine 1, and after the strip has slipped out of the multi-strand straightening machine 1, it is fed to the downstream side by the restraining force of only the entry side induction pinch roller 5. At this time, since the entry guide pinch roller 5 is configured as shown in FIG. 6 and sandwiches the steel strip in the state of FIG. 8 or 9, even if there is a difference in thickness between the multiple steel strips, The strips are securely sandwiched, and there is no deviation in the running speed between the strips.

[0055] Immediately After passing through the final cut product (length L + l _c) of the head exit side induction pinch roller 11, giving it a scissors by egress induction pinch roller 11. At this time, as described above, the distance between the inlet-side and outlet-side guide pinch rollers 5 and 11 is set within L-α, so that after the outlet-side pinch roller 11 clamps the head of the final cut product, When the entrance-side guide pinch roller 5 is opened, the rear end deformed portion does not reach the position of the entrance-side guide pinch roller 5, and the rear-end deformed portion is not pinched by the entrance-side guide pinch roller 5. It is possible to avoid the adverse effect of sandwiching the deformed portion.

As described above, by using the inlet / outlet side guide pinch rollers 5 and 11 of the present embodiment, the variation in the final cutting (n cutting), which is conventionally fatal in the traveling cutting system, is suppressed, and the product length is reduced. It is possible to improve the accuracy of the same as the accuracy from the first cut to the n-1 cut.

Next, the structure of the rear tilting table 13 will be described. First, the rear tilting table 13
Describe the purpose of introducing. Since the strip steel is cut while being pinched by the exit side guide pinch roller 11, it is necessary to move the strip steel in the same direction as the cutting direction (moving blade moving direction) at the time of cutting by the same amount as the moving amount of the cutting portion. In order to make this possible, it is necessary to chill the exit-side guide pinch roller 11 in synchronization with the cutting. Further, since the angle steel is cut in the vertical direction and the channel steel and the H (I) shape steel are cut in the diagonal direction, it is necessary to switch the tilting direction between the vertical direction and the diagonal direction according to the cutting direction. There is. Therefore, the rear surface chilling table 13 having such a function was developed, and by placing the exit side guide pinch roller 11 thereon, it is possible to prevent the occurrence of bending at the time of cutting.

FIG. 10 is a side view of the rear face tilting table applied to this embodiment. The rear face tilting table 13 is provided on a lower portion of the table 29, a base end side (upstream side) of the table 29, and a copying device 34 which guides the tilting direction in a constant tilt direction, and a copying device which also guides the vertical direction. 60, an output side guide pinch roller 11 provided integrally with the table 29 on the base end side of the table 29, and a tilting drive device 40 installed below the output side guide pinch roller 11. The details of each configuration will be described below.

FIG. 11 is a sectional view taken along line CC of FIG. 10, showing a pivot portion for tilting. The tilting pivot portion will be described with reference to FIGS. 10 and 11. In the figure, 28 is a lower base, 27 is a bearing box fixed to the lower base 28, and 26 is a self-aligning bearing which is installed in the bearing box 27 and is rotatable in three-dimensional directions. The self-aligning bearing 26 rotatably supports the table 29 via the shaft 30a and the bearing 30b. Reference numeral 31 denotes a cushion for balancing, which is provided on both sides in the width direction of the table 29 in the same cross section as the self-aligning bearing 26, for stabilizing the table 29 against pitching.

FIG. 12 is a sectional view taken along the line G--G in FIG. 10, and FIG. 13 is a sectional view taken along the line H--H in FIG.
First, the configuration of the copying apparatus 34 will be described with reference to FIGS. 10 and 12. As shown in FIG. 12 (a), the copying apparatus 34 includes an inclined rail 35 fixed to the lower portion of the table 29 at an inclined angle and a left and right of the inclined rail 35 so that the inclined rail 35 can be moved. To guide 4
It is provided with individual guide rollers 37. The guide roller 37 can be moved by an actuator 38 so that it can come into contact with or separate from the inclined rail 35. Further, a tapered wedge type actuator 39 for fixing the position of the guide roller 37 in contact with the inclined rail 35 is provided.

In the copying apparatus 34 configured as described above, the table 29 can be guided in the direction of inclination of the inclined rail 35 by bringing the guide roller 37 into contact with the inclined rail 35, so that the guide roller 37 can be guided. By separating from the inclined rail 35, the regulation by the inclined rail 35 can be released, as shown in FIG.

Next, the structure of the copying apparatus 60 will be described with reference to FIGS. The copying apparatus 60 is shown in FIG.
As shown in FIG. 3A, a vertical rail 61 fixed to the lower portion of the table 29, and four guide rollers 63 arranged on the left and right of the vertical rail 61 and movably guiding the vertical rail 61 are provided. There is. Then, the guide roller 63
Is movable by an actuator 64,
The vertical rail 61 can be contacted with and released from the vertical rail 61.

In the copying apparatus 60 configured as described above, the guide roller 63 is brought into contact with the vertical rail 61 so that the table 29 is vertically moved along the vertical rail 61 as shown in FIG. 13A, the regulation by the vertical rail 61 can be released by removing the guide roller 63 from the vertical rail 61, as shown in FIG.

FIG. 14 shows a cross section taken along the line EE in FIG. 10 and shows a main part of the driving device 40 for tilting. 15 is a sectional view taken along the line FF in FIG.
The configuration of the tilting drive device 40 will be described below with reference to FIGS. 10, 14 and 15. In the figure, reference numeral 41 denotes an eccentric shaft, which rotates the table 29 up and down by rotating the eccentric shaft. Are set to match. The eccentric shaft 41 is fixed to the base frame 43 via two bearings 42 at the perfect circles at both ends.

Bearings 46 are incorporated into both ends of the eccentric portion of the eccentric shaft 41, and sliders 47 are installed above the bearings 46. The slider 47 is housed in a rail 48 formed integrally with the tilting table, and its vertical movement is restricted. That is, the table 29 is supported by the bearing 46 via the slider 47 in a state where movement in the vertical direction is restrained, and is also movable in the width direction of the table 29 (direction perpendicular to the longitudinal direction).

The eccentric shaft 41 is connected to a drive motor 45 via a coupling 44. Then, the drive motor 45 is driven in synchronization with the cutting cycle of the cross-cutting machine, and makes one rotation in each cycle. As a result, the table 29 descends by the same amount as the descending amount of the blade at the same timing as the blade of the traveling beveler to be described later.

The operation in the case of performing the traveling oblique cutting of the steel strip by using the rear surface chilling table 13 configured as described above will be described with reference to FIGS. 10 to 15. In the case of oblique cutting, in order to make the copying apparatus 34 function,
As shown in FIG. 1A, the actuator 38 causes the guide roller 37 to contact the inclined rail 35, and
As shown in FIG. 3A, the guide roller 63 is separated from the vertical rail 61 by the actuator 64.

On the contrary, when the copying apparatus 60 is made to function in the case of vertical cutting, the guide roller 63 is moved by the actuator 64 to the vertical rail 6 as shown in FIG. 13B.
1 and a guide roller 37 is detached from the inclined rail 35 by an actuator 38 as shown in FIG.

The basic operation of running and cutting is the same as that described in the section of the input / output side guide pinch rollers 5 and 11 described above. The guide steel is pinched by the side guide pinch roller 5 and fed in the pinched state to the downstream side while being synchronized with the multiple straightening machine 51. Send to the downstream side with binding force. Then, as soon as the head of the final cut product (length L + l _c) it is fed to the position of the exit-side induction pinch rollers 11, which pinch the outlet side induction pinch roller 11.

In this state, the moving blade 91 of the traveling cutting machine 7 is moved to cut the bar steel, and at the same time, the driving device 40 for tilting is driven to synchronize with the movement of the moving blade 91 and the moving amount of the moving blade 91. The table 29 is tilted by the amount. As a result, the steel strip can be cut without bending or the like, and the plurality of steel strips are not displaced. As described above, according to the rear face tilting table of the present embodiment, the rear face tilting table applicable to oblique cutting and vertical cutting can be realized with a simple structure.

In the above description, the case of so-called downcut in which the movable blade 91 as shown in FIG. 3 is moved obliquely downward has been described, but the present invention is not limited to this.
It goes without saying that the present invention can be applied even in the case of so-called up-cut in which 1 is moved diagonally upward. In this case, the eccentric shaft 41 in FIG. 14 may be rotated to raise the table 29 from the standby state for a moment to return it to the standby state. To do so,
In the standby state of No. 4, the eccentric side of the eccentric shaft 41 may be arranged on the lower side.

Embodiment 2. Before describing the contents of the second embodiment, the purpose of the second embodiment will be described. The steel strip drawn by the rolling mill is divided into cooling floor lengths on the exit side of the rolling mill. The front and rear ends of the rolled bar steel are shown in FIGS.
As shown in FIG. 7 (a side view of FIG. 16 viewed from the direction of arrow A), the protrusions are commonly called “bello”, and are slightly sagging. In addition, in the intermediate dividing portion, as shown in FIGS. 18 to 20 (FIG. 19 is a side view of FIG. 18 viewed from the arrow B, FIG. 20 is a view of FIG. 18 viewed from the arrow C), and the cutting is performed. The surface tends to widen (see FIG. 20) and can be caught (warped) called “burr” (see FIG. 19). As shown in FIG. 21, a plurality of steel strips having the thus deformed ends must be lined up and simultaneously inserted into the hole shape of the cutter set 90 repeatedly. And, the clearance C ₁ between the bar steel to be cut and the hole-shaped blade in the known technology which is currently put into practical use,
C ₂ (see FIG. 22) is extremely small, and is about 2 mm even in the largest case.

However, with such a small clearance, it is very difficult to insert the tip of the bar into the hole even if the tip of the bar and the bar is provided with a trumpet-shaped guide, which results in very high productivity. It cannot be used as an actual machine for the required hot-rolled steel rolling line. Therefore, as a result of verification by the inventors of the present invention, how much clearance is required to smoothly insert into the hole shape and to enable efficient production.
It was found that about mm is necessary (see FIG. 23 C ₃ =
C ₄ = about 10 mm Incidentally, FIG. 23 is a view in which the hatched portion in FIG. 22 is removed to increase the clearance. ). However, if the diagonal cutting with the clearance of about 10 mm is executed, the flat horizontal portion (web) is deformed as shown in FIGS. 24 (a) and 24 (b), and the product becomes unusable. is there.

In view of this, the second embodiment provides a blade set in which the front end of the steel strip can be easily inserted and the steel strip is not deformed during oblique cutting. Figure 2
5 is an explanatory diagram of the configuration of the fixed blade 97 of the second embodiment. In FIG. 25, a fixed blade having a single hole shape is shown for simplification of description, but actually, a plurality of hole shapes are provided as shown in the first embodiment. Less than,
The structure of the fixed blade 97 will be described with reference to FIG.

The fixed blade 97 is composed of a first fixed blade 97a and a second fixed blade 97b, and the second fixed blade 97b is installed so as to be vertically movable with respect to the first fixed blade 97a. A hole-shaped gap is formed in the facing portion between the first fixed blade 97a and the second fixed blade 97b. A knocker 98 is attached to the second fixed blade 97b, and a pressing spring 99 is installed between the knocker 98 and the second fixed blade 97b.

The operation of the fixed blade 97 configured as described above will be described. By pressing the upper end of the knocker 98 with the ram 74, the second fixed blade 97b moves downward and
The fixed blade 97b comes into contact with the steel strip 100 to sandwich the steel strip. When the knocker 98 further descends, the pressing spring 99 contracts, and the second fixed blade 97b further presses the bar steel 100. On the other hand, when the ram 74 separates from the knocker 98, the second fixed blade 97b is configured to return to its original position.

26 to 29 are operation explanatory views of the blade set 110 using the fixed blade 97 described above. The movable blade 91 and the fixed blade 97 are arranged so as to overlap with each other in the front-back direction with respect to the traveling direction of the steel bar. It is shown in the same manner as. In the figure, H ₁ is the distance between the ram 74 and the knocker 98 of the second fixed blade 97b, H ₂ is the distance between the ram 74 and the knocker 93 of the moving blade 91,
There is a relationship of H ₁ <H ₂ . Further, the hole-shaped clearance of the movable blade 91 is about the same as that shown in FIG. 23, and the bar steel 100 can be easily inserted.

The operation will be described below with reference to FIGS. The state shown in FIG. 26 is a state in which the steel strip 100 has been threaded and the cutting operation has not yet started (step 1). Next, as shown in FIG. 27, when the length measurement is completed and the ram 74 is lowered, the knocker 98 of the second fixed blade 97b is pushed by the ram 74 and the second fixed blade 97b is lowered. Then, the second fixed blade 97b contacts the web of the bar steel 100, and the bar steel 100 is sandwiched between the second fixed blade 97b and the first fixed blade 97a (step 2). In this state, there is a gap H ₂ 'between the ram 74 and the knocker 93 of the movable blade 91,
The moving blade 91 has not started moving yet.

Next, as shown in FIG. 28, when the ram 74 is further lowered, the ram 74 contacts the knocker 93 of the movable blade 91, the movable blade 91 starts skewing, and the hole-shaped blade of the movable blade 91 is moved. The strip 100 comes into contact with the strip 100 and is pushed in an oblique direction. Therefore, the steel strip 100 is pushed by the moving blade 91 and moves in the horizontal direction, so that the relative position with respect to the fixed blade 97 is as shown in FIG.
(Step 3). At this time, the knocker 98 of the second fixed blade 97b is pushed further downward by the ram 74, but the downward movement of the knocker 98 due to this is absorbed by the pressing spring 99 being compressed. The pressing force at this time can be adjusted by adjusting the pressing spring 99.

[0080] In the state of FIG. 28, the clearance between and long products 100 Web X ₁ side and the second fixed blade 97b of the X ₂ side of the first fixed blade 97a has become zero, long products 10
It is possible to prevent the 0 web from being deformed. In addition, steel bar 10
The clearance between the No. 0 flange and the Y ₁ and Y ₂ surfaces of the first fixed blade 97a and the Y ₃ and Y ₄ surfaces of the movable blade 91 is 2 mm or less.

Next, as shown in FIG. 29, when the ram 74 further descends, the movable blade 91 obliquely moves and obliquely cuts the steel strip 100 (step 4). Note that the downward movement of the knocker 98 at this time is absorbed by the pressing spring 99, as in the case of FIG. 28. After the slope is completed,
Both the movable blade 91 and the second fixed blade 97b return to the state of FIG.

As described above, according to the blade set of the second embodiment, it is easy to insert the bar steel into a hole shape, and the bar steel can be obliquely cut without being deformed.

Third Embodiment Since the cold-formed bar is manufactured from the coil, the web thickness t ₁ and the flange thickness t ₂ are the same as shown in FIG. However, the strip steel formed by hot rolling has different web plate thickness t ₁ and flange plate thickness t _2, and as shown in FIG.
₁ <t ₂ . As described above, when the steel strip formed by the web and the flange having different plate thicknesses starts to be obliquely cut on both surfaces at the same timing, the web bends as shown in FIG.

This curvature is caused by the gap between the web surface and the flange surface when the cutting is completed. This point will be described with reference to FIG. 33, which graphically shows the relationship between shear resistance and time. In FIG. 33, the vertical axis represents shear resistance and the horizontal axis represents time. In FIG. 33, t _w indicates the time required for breaking the web, and t _f indicates the time required for breaking the flange. As shown in FIG. 33, when the cutting of the web surface and the flange surface are started at the same time, the rupture of the thicker flange (completion of substantial cutting) is delayed by the time t _D. For this reason, the flange is sheared in a state where the web is not restrained, and at this time, the web is bent by the force exerted by the blade on the flange. In other words, time t
_{During (D} ), the moving blade in contact with the web surface deforms (amount).

Therefore, in the third embodiment, it is intended to prevent the bending of the web by matching the break timings of the web and the flange. That is, as shown in FIG. 34, the starting point of cutting the web is shifted from the starting point of the flange cutting by t _s time so that the breaking time of the web and the flange coincide with each other.

FIG. 35 is an explanatory view of the movable hole-shaped blade of the present embodiment. FIG. 35 (a) shows a state before the cutting operation by inserting the steel strip 100 into the hole-shaped blade, and FIG. The state just before the flange cutting of the steel strip 100 is shown. As shown in FIG. 35, the clearance C _{6 of} the flange and the clearance C ₅ of the web have a relationship of C ₆ <C ₅ , and the clearance C ₇ of the web is present at the cutting start point of the flange. Then, this C ₇ is determined so as to correspond to the time difference t _s for matching the timing of breaking the web and the flange.

According to the time difference cutting of the present embodiment, even in the case of a steel strip formed by hot rolling in which the web and the flange have different plate thicknesses, the web can be obliquely cut without bending and the band saw and the friction. A good hot-rolled bar product located in the middle of the saw can be stably manufactured regardless of the shape.

[0088]

As described above, according to the present invention, a plurality of straightened steel strips are sandwiched by the guide pinch rollers on the entrance side and the exit side, and the rear tilting table is synchronized with the tool and tilted in the moving direction of the tool to be inclined. Since the cutting is performed, the multiple cuts can be straightened and cut without the cut surface being deformed and the product length of the final cut being varied.

Further, two first rollers arranged at a predetermined distance from each other and one second roller arranged between the first rollers.
Since the roller is provided and the bar steel is sandwiched by the first roller and the second roller, even if there are variations in thickness among the plurality of bar steels to be sandwiched, all the bar steels can be firmly pinched. it can. Therefore, the conveyance speed of each bar is constant, and the variation in cutting length can be suppressed to a small value.

Furthermore, since the distance between the two first rollers can be adjusted, it is possible to perform appropriate sandwiching according to the type of bar steel.

Further, the distance of the guide pinch roller on the entrance / exit side is set to
From the product length, the distance traveled by the bar steel was subtracted after the tip of the bar steel reached the position of the output-side guide pinch roller and before the output-side guide pinch roller pinched the tip of the bar steel. Since the length is set shorter than the length, the steel strip can be always sandwiched by the upstream or downstream pinch rollers according to the product length.

Further, since the stopper for restricting the amount of reduction of the second roller is provided, the amount of reduction when the steel strip is sandwiched between the first roller and the second roller can be easily regulated to a predetermined amount.

Further, at least before the bar steel slips out of the straightening machine, the bar steel is sandwiched by the inlet side guide pinch rollers and fed to the multi-row running cutting device side, and the leading end side of the bar steel is fed to the position of the outlet side guide pinch roller. Since the guide steel strip is sandwiched between the guide pinch rollers on the exit side and the guide pinch roller on the entry side is released when the guide rail is released, the steel strip can be clamped by the guide pinch rollers on the input or output side depending on the product length. At the same time, it is possible to prevent the entrance-side guide pinch roller from pinching the trailing end crop, and prevent the entrance-side guide pinch roller from being adversely affected by the trailing end crop being caught.

Further, since the direction of tilting of the rear face tilting table can be regulated in accordance with the moving direction of the blade of the multi-running running cutting device, various angles such as angle steel, channel steel, H-shaped steel and rails can be specified. It is possible to cut the types of steel strips according to the shape of each steel strip.

Further, the fixed blade is composed of at least two blades forming a hole shape, and these two blades are configured to be movable relative to each other. Since the cutting is performed by using, it is possible to set a large clearance for the hole shape, facilitate the work of inserting multiple hole steels into multiple hole shapes, and enable efficient multiple straightening and cutting. .

[0096]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of the first embodiment of the present invention, and is a diagram showing an in-line straightening / cutting system of a hot-rolled steel rolling line.

FIG. 2 is an explanatory diagram of the traveling cutting device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a cutting method according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of a blade set according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of a blade set according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a pinch roller according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram of a standby state of the pinch roller according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a usage state of the pinch roller according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram of a usage state of the pinch roller according to the embodiment of the present invention.

FIG. 10 is a side view of the rear chilling table according to the embodiment of the present invention.

11 is a cross-sectional view taken along line CC of FIG.

12 is a sectional view taken along line GG of FIG.

13 is a sectional view taken along line HH of FIG.

14 is a cross-sectional view taken along line EE of FIG.

15 is a cross-sectional view taken along the line FF of FIG.

FIG. 16 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 17 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 18 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 19 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 20 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 21 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 22 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 23 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 24 is an explanatory diagram for explaining the problem of the second embodiment.

FIG. 25 is an explanatory diagram of a fixed blade according to the second embodiment.

FIG. 26 is an operation explanatory diagram of the second embodiment.

FIG. 27 is an explanatory diagram of the operation of the second embodiment.

FIG. 28 is an operation explanatory diagram of the second embodiment.

FIG. 29 is an operation explanatory diagram of the second embodiment.

FIG. 30 is an explanatory diagram for explaining the problem of the third embodiment.

FIG. 31 is an explanatory diagram for explaining the problem of the third embodiment.

FIG. 32 is an explanatory diagram for explaining the problem of the third embodiment.

FIG. 33 is an explanatory diagram for explaining the problem of the third embodiment.

FIG. 34 is an explanatory diagram of the third embodiment.

FIG. 35 is an explanatory diagram of the third embodiment.

FIG. 36 is an explanatory diagram illustrating an outline of a general inline straightening / traveling cutting system for a steel strip rolling line.

FIG. 37 is an explanatory diagram of a device of a conventional in-line straightening / traveling cutting system.

FIG. 38 is an explanatory diagram of a blade of a conventional device.

FIG. 39 is an explanatory diagram of a blade of a conventional device.

FIG. 40 is an explanatory diagram of a device of a conventional inline straightening traveling cutting system.

FIG. 41 is an explanatory diagram of a conventional problem.

FIG. 42 is an explanatory diagram of a conventional problem.

FIG. 43 is an explanatory diagram of a conventional problem.

FIG. 44 is an explanatory diagram of a conventional problem.

[Explanation of symbols]

1 Multi-row straightening machine 5 Entry side induction pinch roller 5a, 5b Lower roller 5c Upper roller 7 Multi-row cutting machine 11 Output side pinch roller 11a, 11b Lower roller 11c Upper roller 13 Rear chilling table

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-2-262909 (JP, A) JP-A-9-136213 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 39/00 B21B 15/00 B21B 39/22 B21D 3/02 B23D 15/04 B23D 25/04 B26D 1/56

Claims (8)

(57) [Claims] 1. A multi-strand straightening device for multi-straightening a strip steel consisting of orthogonal webs and flanges, and a strip steel which is installed on the downstream side of the strip straightening device and which is straightened by the multiple strip straightening device is sandwiched. And a fixed blade and a movable blade that are installed on the downstream side of the inlet-side guide pinch roller and that have a plurality of hole shapes that match the cross-sectional shape of the steel strip. A multi-row running cutting device for moving a moving blade in an oblique direction with respect to a web and a flange in a cross section of the steel bar, and a multi-run running cutting device disposed downstream of the multi-run running cutting device. A strip steel having a delivery-side guide pinch roller for sandwiching the strip steel, and a rear face tilting table for performing tilting in the moving direction of the blade of the multi-run running cutting device in synchronization with the movement of the blade. Multi in rolling line Straightening / cutting system. 2. The inlet-side guide pinch roller and the outlet-side guide pinch roller are arranged between two first rollers arranged at a predetermined distance in the flow direction of the steel strip, and between the first rollers. The multi-strand straightening / cutting system in a steel strip rolling line according to claim 1, further comprising one second roller, wherein the steel strip is sandwiched between the first roller and the second roller. 3. The multi-strand straightening / cutting system for a steel strip rolling line according to claim 2, wherein the distance between the two first rollers can be adjusted. 4. The distance between the inlet-side guide pinch roller and the outlet-side guide pinch roller is determined from the product length after the tip of the strip reaches the position of the outlet-side guide pinch roller, and then the outlet-side guide pinch roller. 4. The multi-roll rolling line according to claim 1, wherein the length is set to be shorter than a length obtained by subtracting a traveling distance of the strip before the roller clamps the leading end of the strip. Straightening / cutting system. 5. The multi-strand straightening / cutting system for a steel strip rolling line according to claim 2, further comprising a stopper that regulates a reduction amount of the second roller. 6. The strip steel is sandwiched by the inlet side guiding pinch rollers before being fed out of the multi-strand straightening device and sent to the multi-run running cutting device side, and the leading end side of the strip steel is guided to the exit side. 6. The delivery guide pinch roller sandwiches the bar steel when fed to the position of the pinch roller, and then releases the entry guide pinch roller. Multi-strand straightening / cutting system in the steel strip rolling line described in. 7. The rear surface chilling table is provided with a plurality of tilting direction defining means capable of defining a direction of tilting in accordance with a moving direction of a blade of the multi-row running cutting device, and the plurality of tilting direction defining means are provided. 7. The multi-strand straightening / cutting system for a steel strip rolling line according to any one of claims 1 to 6, wherein the multi-strand straightening / cutting system can be used by switching according to the moving direction of the blade. 8. The fixed blade comprises at least two blades forming a hole shape, and these two blades are configured to be movable relative to each other, and the fixed steel bar is sandwiched between the two blades, The multi-strand straightening / cutting system in a strip steel rolling line according to any one of claims 1 to 7, wherein cutting is performed by a moving blade.