JP2915414B2 - Method and apparatus for preventing buckling of width reduction press in rolling line - Google Patents

Description

The present invention relates to a method and an apparatus for preventing buckling of a width reduction press in a rolling line.

[Prior Art] Conventionally, a buckling prevention means of a width reduction press in a rolling line presses both side surfaces of a material a such as a slab as shown in FIGS. In a width reduction press in which the molds b for performing the reduction are arranged opposite to each other so as to sandwich the conveying line of the material a, one press roll c is provided on each of the upper and lower surfaces between the molds b for the width reduction press. The width of the material a is reduced while the material a is pressed from above and below by the pressing roll c so as to prevent buckling of the material a during the width reduction.

[Problems to be Solved by the Invention] However, in the above-described buckling prevention means of the width reduction press,
Since only one press roll c is provided on each of the upper and lower surfaces of the material a, there is a limit to the width reduction that can prevent the buckling of the material a. Amount is 35
It is about 0 mm.

Therefore, when reducing the width of the material a by 350 mm or more, the width of the material a must be reduced a plurality of times repeatedly, which is an obstacle to improving the working efficiency.

An object of the present invention is to solve the above-mentioned problem and to prevent buckling of a material when the width reduction is increased.

[Means for Solving the Problems] In order to achieve the above object, a narrow pressing roll is selected when the material before width reduction is a narrow material, and a wide pressing roll is selected when the material before width reduction is a wide material. A method for preventing buckling of a width reduction press in a rolling line by selecting a presser roll to prevent buckling of a material, wherein when a width reduction of a material is performed by a width reduction press, the width of the material before width reduction and the width of the material are reduced. When the width reduction amount is within a predetermined value and the material before width reduction is a narrow material, the length is shorter than the width of the material after width reduction molding.
A pair of narrow pressing rolls are opposed to the upper and lower surfaces of the material near the position of the center of gravity of the width reduction force, and the material is pressed by a pair of narrow pressing rolls. If the amount of width reduction with respect to the width is within the prescribed value and the material before width reduction is a wide material, a pair of wide pressing rolls having a length shorter than the width of the material after width reduction molding is applied to the width reduction force. The material is pressed by a pair of wide pressing rolls while facing the upper and lower surfaces of the material in the vicinity of the position of the center of gravity, and the width of the material before width reduction and the width reduction amount for the material exceed a predetermined value. In this case, the two sets of wide pressing rolls having a length shorter than the width of the material after the width reduction are opposed to the upper and lower surfaces of the material in the vicinity of the position of the center of gravity of the width reduction force, and the two sets of wide pressing rolls are used. Press the material.

Further, in the buckling prevention device for the width reduction press in the rolling line of the present invention, it is possible to move along the rolling line upward and downward between the dies of the width reduction press arranged on both sides of the rolling line and to perform rolling. Narrow presser rolls are arranged facing each other so as to be able to approach and separate from each other with respect to the line, and can be moved along the rolling line to the downstream side of the narrow presser rolls above and below the rolling line. A first wide pressing roll is disposed so as to be able to approach and separate from the rolling line, and is disposed along the rolling line on the downstream side of the rolling line of the first wide pressing roll above and below between the dies. The second wide presser rolls are arranged so as to be movable and move closer to and away from the rolling line.

[Operation] In the method for preventing buckling of the width reduction press in the rolling line of the present invention, one set of narrow width presser rolls and one set of wide width presses are provided according to the width of the material before width reduction and the width reduction amount for the material. A roll and two sets of wide pressing rolls are selected, and the selected pressing rolls press the upper and lower surfaces of the material near the position of the center of gravity of the width reduction force to prevent buckling of the material.

In the buckling prevention device of the width reduction press in the rolling line of the present invention, one set of upper and lower narrow press rolls and two sets of upper and lower wide press rolls are selected or combined, and these rolls are positioned between the dies. Hold the material from above and below,
Prevents buckling of materials of various widths that are reduced in width by the die of the width reduction press.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In a width reduction press in which width reduction dies 35 are arranged on both sides of a rolling line S so as to be able to approach and separate from each other, a rolling line S between the dies 35 is used. A first rail 1 extending parallel to the rolling line S is provided above the first rail 1. A first frame 3 having a required shape with wheels 2 pivotally mounted on the first rail 1 is movably mounted on the first rail 1. A piston rod 4 which can be moved forward and backward at one end of the first rail 1;
A first cylinder 5 having a first cylinder 5 is fixed via a required member, and the piston rod 4 of the first cylinder 5
To the frame 3.

The first cylinder 5 is located below the first rail 1 and is arranged such that the piston rod 4 is parallel to the first rail 1.

A second frame extending parallel to the first rail 1 is attached to a leg 6 of the first frame 3 extending downward from the first rail 1.
A second frame 10 and a third frame 10 having wheels 8, 9 pivotally supported at required positions on the second rail 7, respectively.
Is mounted so that it can run.

The second frame 10 is arranged near the entry side of the rolling line S, and the third frame 11 is arranged near the exit side of the rolling line S.

At one end of the second rail 7 there is a second cylinder 13 having a retractable piston rod 12 and at the other end of the second rail 7 a third cylinder having a retractable piston rod 14. 15 is fixed via a member having a required shape so that the piston rods 12 and 14 face each other, the piston rod 12 of the second cylinder 13 is connected to the second frame 10, and the third cylinder 15 piston rods 14 third
To the frame 11.

The second and third cylinders 13 and 15 are connected to the second rail 7.
And the piston rods 12 and 14 are arranged so as to be parallel to the second rail 7.

An axle box in which a narrow press roller 17 is rotatably supported on a guide portion 16 of a second frame 10 extending below the second rail 7.
18 is slidably fitted in the vertical direction, and a piston rod 19 that can be moved forward and backward is mounted on the upper surface of the second frame 10.
Is fixed so that the piston rod 19 is directed vertically and downward, and the piston rod 19 is connected to the axle box.

The narrow press roll 17 is disposed so that its axis is parallel to the width direction of the rolling line S.

The fourth frame 22 is fitted to the guide portion 21 of the third frame 11 extending below the second rail 7 so as to be slidable in the vertical direction, and is moved forward and backward on the upper surface of the third frame 11. Securing a fifth cylinder 24 having a possible piston rod 23 such that the piston rod 23 is vertically and downwardly directed,
A piston rod 23 is connected to the fourth frame 22.

Axle boxes 29 and 30 rotatably supporting wide pressing rolls 27 and 28 on guide portions 25 and 26 of a fourth frame 22 extending downward,
A sixth cylinder 33 and a seventh cylinder 34 having vertically movable piston rods 31 and 32 fitted on the upper surface of the fourth frame 22 so as to be slidable, 31 and 32 are fixed vertically and downward, and are connected to the piston rod 31 and the axle box 29, and the piston rod 32 is connected to the axle box 30.

The wide pressing rolls 27 and 28 are disposed such that their axes are parallel to the width direction of the rolling line S.

Further, below the rolling line S between the dies 35, a device in which the above-described device is turned upside down is symmetrically arranged with respect to the rolling line S such that the narrow press roll 17 and the wide press roll face each other. I do.

In the present embodiment, the dimension of the narrow presser roll 17 is set to 750
φ 400 mm, and the width of the wide presser rolls 27 and 28 is 750 φ 7
50 mm.

 Next, the operation of the present embodiment will be described.

As shown in FIG. 3, slab thickness t = 250 mm, slab width W
= 1200mm, 1600mm material, the width of the material is 900mm, 130
When width reduction is performed with a width reduction amount ΔW = 300 mm so as to be 0 mm, a material having a slab thickness t = 250 mm and a slab width W = 1200 mm is converted into a width reduction amount ΔW = 4 such that the output width of the material is 750 mm.
When the width is reduced by 50 mm, buckling of the material is prevented by the narrow presser roll 17.

When the buckling of the material is to be prevented only by the narrow presser roll 17 when the width of the material is reduced, the piston rod 12 of the second cylinder 13 is moved forward, and the piston rod 14 of the third cylinder 15 is moved backward. The second frame 10 to the first
To the approximate center of the frame 3
11 is retracted to the first frame 3 near the exit side of the rolling line S.

When the third frame 11 is retracted to a position closer to the exit side of the rolling line S, the piston rod 23 of the fifth cylinder 24 is retracted, and is supported by the axle boxes 29, 30 via the fourth frame 22. The wide press rolls 27 and 28 are vertically separated from the rolling line S.

Further, the piston rod 4 of the first cylinder 5 is moved forward or backward to move the first frame 3 by a predetermined amount in the inward or outward direction of the rolling line S, and the width reduction force of the narrow presser roll 17 is reduced. After the position of the center of gravity of the fourth cylinder 20 is adjusted, the piston rod 19 of the fourth cylinder 20 is advanced to bring the narrow presser roll 17 supported by the axle box 18 close to the rolling line S vertically, and the narrow presser roll 17 The material is pressed from above and below to prevent buckling of the material during width reduction.

As described above, the width of the material is 900 mm, 130 mm
0 mm and 750 mm, so a narrow presser roll 17 with a length of 400 mm
And the mold 35 do not interfere with each other.

As shown in FIG. 3, slab thickness t = 250 mm, slab width W
= 2200 mm, and the width reduction ΔW = 300 mm so that the width of the material becomes 1900 mm, when the slab thickness t = 250 mm, the material of the slab width W = 1600 mm, the width of the material When width reduction is performed with a width reduction amount ΔW = 450 mm so that the slab thickness becomes 1150 mm, a slab thickness t = 250 mm and a slab width W = 1600 m.
When the width of the material m is reduced by the width reduction amount ΔW = 600 mm so that the width of the material becomes 1000 mm, the wide pressing roll 27 is used.
The material prevents buckling.

When the buckling of the material is performed only by the wide presser roll 27 when the width of the material is reduced, the piston rod 12 of the second cylinder 13 is retracted, and the piston rod 14 of the third cylinder 15 is advanced. 2nd frame 10 first
The third frame 11 is moved to a substantially central portion of the rolling line S of the first frame 3 while being retracted near the entry side of the rolling line S of the frame 3.

When the second frame 10 is retracted to a position close to the entry side of the rolling line S, the piston rod 23 of the fourth cylinder 20 is retracted, and the narrow pressing roll 17 supported by the axle box 18 is moved to the rolling line S. Away from the vertical.

Further, similarly to the case of using the narrow presser roll 17 described above,
By moving the piston rod 4 of the first cylinder 5 forward or backward, the position of the center of gravity acting on the width reduction force of the wide pressing roll 27 is adjusted.

When the position of the wide pressing roll 27 is determined, the piston rod 23 of the fifth cylinder 24 is advanced to make the fourth frame 22 approach the rolling line S substantially perpendicularly,
The piston rod 32 of the sixth cylinder 33 is vertically retracted from the rolling line S by retreating the piston rod 32 of the seventh cylinder 34 to separate the wide presser roll 28 supported by the axle box 30 from the rolling line S.
Is advanced, the wide pressing roll 27 supported by the axle box 29 is vertically approached to the rolling line S, and the material is pressed from above and below by the wide pressing roll 27 to prevent buckling of the material when the width is reduced.

At this time, the cylinders 33 and 34 in FIGS. 6 and 7 may be operated in reverse to press the material from above and below by the wide pressing roll 28 to prevent the material from buckling when the width is reduced. .

As described above, the width of the material is 1900 mm, 11
Wide presser roll 2 with a length of 750 mm because it is 50 mm and 1000 mm
7 and the mold 35 do not interfere.

As shown in FIG. 3, slab thickness t = 250 mm, slab width W
= 2200 mm, when the width reduction ΔW = 450 mm so that the width of the material becomes 1750 mm, the slab thickness t = 250 mm, the material of the slab width W = 2200 mm, the width of the material When the width reduction is performed with the width reduction amount ΔW = 600 mm so that the width becomes 1600 mm, the buckling of the material is prevented by the two wide pressing rollers 27 and 28.

When the buckling of the material is to be prevented by both of the wide pressing rolls 27 and 28, the second frame 10 is retracted near the entry side of the rolling line S, as in the case where only the wide pressing roll 27 is used. Then, the narrow presser roll 17 is vertically separated from the rolling line S, and the piston rod 4 of the first cylinder 5 is moved forward or backward, so that the wide presser rolls 27 and 2 are moved.
Adjust the position of the center of gravity for the width reduction force of 8.

Further, the piston rod 23 of the fifth cylinder 24 and the piston rods 31 and 32 of the sixth and seventh cylinders 33 and 34 are respectively advanced, and the fourth frame 22 is vertically brought close to the rolling line S. The wide presser rolls 27 and 28 supported by the axle boxes 29 and 30 are brought close to the rolling line S, and the material is pressed from above and below by the wide presser rolls 27 and 28 to prevent buckling of the material when the width is reduced. Do.

At this time, the wide pressing rolls 27 and 28 can be individually lifted and lowered by the sixth and seventh cylinders 33 and 34, so that even if the shape of the material in the height direction changes, the wide width is correspondingly increased. The material can be pressed from above and below by the press rolls 27 and 28.

As shown in FIG. 3, when a material having a slab thickness t = 250 mm and a slab width W = 900 mm, 1200 mm, 1600 mm, and 2200 mm is subjected to width reduction with a width reduction ΔW = 150 mm, the slab thickness t = 2
A material with a slab width W = 900mm for 50mm is also used to reduce the width reduction ΔW = 300.
In the case of width reduction with mm, the width of the material with slab thickness t = 250mm and slab width W = 1200mm is also reduced with the width reduction ΔW = 600mm.
Even if 27 and 28 are not used, buckling due to width reduction forming does not occur in the member.

As described above, in the buckling prevention device of the width reduction press in the rolling line illustrated in FIGS. 1 and 2, the width of the material to be width reduced by the die is slightly larger than the width of the material. The material to be formed in the width reduction is pressed from above and below between the dies by the short and narrow pressing rolls 17 or the wide pressing rolls 27 and 28 having a short length. The width reduction amount of a material having a width of at least one time can be increased, and therefore, the material can be efficiently rolled down.

Note that the method and apparatus for preventing buckling of the width reduction press in the rolling line of the present invention are not limited to only the above-described embodiment, and various changes can be made without departing from the gist of the present invention. Of course.

[Effects of the Invention] As described above, according to the method and the apparatus for preventing buckling of the width reduction press in the rolling line of the present invention, the following various excellent effects can be obtained.

(1) In the method for preventing buckling of a width reduction press in a rolling line according to the present invention, one set of narrow width press rolls and one set of wide width presses are provided according to the width of the material before width reduction and the amount of width reduction for the material. Rolls and two sets of wide presser rolls are selected, and the selected presser rolls press the upper and lower portions of the vicinity of the acting center of gravity of the material to be width-pressed by the die. It is possible to effectively prevent buckling of materials of various widths that are reduced in width by the mold without interference with the mold.

(2) In the buckling prevention device of the width reduction press in the rolling line according to the present invention, one set of upper and lower narrow press rolls and two sets of upper and lower wide presses are provided according to the material width after width reduction and the width reduction amount of the material. The rolls are selected or combined and moved in the direction of the rolling line, and this roll presses from above and below the vicinity of the working center of gravity of the material to be width-pressed by the die. It is possible to prevent buckling of materials of various widths that are reduced in width by the mold without interference with the mold.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
FIG. 3 is a plan view showing the relationship between the narrow and wide presser rolls and the mold of the apparatus shown in FIG. 3, FIG. 3 is a table showing the results of experiments using the apparatus shown in FIG. FIG. 5 is a view showing the buckling prevention device of the width reduction press shown in FIG. In the figure, 17 is a narrow presser roll, 27 is a wide presser roll (first
, 28 denotes a wide pressing roll (second wide pressing roll), 35 denotes a mold, and S denotes a rolling line.

Claims (2)

(57) [Claims] The buckling of a material is selected by selecting a narrow press roll when the material before width reduction is a narrow material and selecting a wide press roll when the material before width reduction is a wide material. A method for preventing buckling of a width reduction press in a rolling line for preventing a width reduction of a material before width reduction and a width reduction amount for the material within a predetermined value when the width reduction of the material by the width reduction press is performed. When the material before reduction is a narrow material, a pair of narrow press rolls having a length shorter than the width of the material after width reduction is placed on the upper and lower surfaces of the material near the position of the center of gravity of the width reduction force. At the same time, the material is pressed by a pair of narrow pressing rolls, and the width of the material before width reduction and the width reduction amount for the material are within a predetermined value, and the material before width reduction is a wide material. In such a case, a set of wide materials having a length shorter than the width of the material after width reduction molding is used. The pressing roll is made to face the upper and lower surfaces of the material in the vicinity of the position of the center of gravity of the action of the width reduction force, and the material is pressed by a set of wide width pressing rolls. Further, the width of the material before width reduction and the width reduction amount for the material are reduced. If the predetermined value is exceeded, two sets of wide pressing rollers having a length shorter than the width of the material after the width reduction are opposed to the upper and lower surfaces of the material near the position of the center of gravity of the width reduction force, A method for preventing buckling of a width reduction press in a rolling line, wherein a material is pressed by two sets of wide pressing rolls. 2. Narrowing upward and downward between the dies of the width reduction press arranged on both sides of the rolling line so as to be able to move along the rolling line and to be close to and away from the rolling line. The width press rolls are arranged to face each other, so that they can move to the rolling line downstream of the narrow press rolls above and below between the dies so as to be warped to the rolling line, and can be moved close to and away from the rolling line. A first wide press roll is disposed opposite to the first wide press roll, between the dies, on the downstream side of the rolling line of the first wide press roll, so that it can move along the rolling line and with respect to the rolling line. A buckling prevention device for a width reduction press in a rolling line, wherein second wide pressing rolls are arranged to face each other so as to be able to approach and separate from each other.