JP3178544B2 - Method and apparatus for forming width of slab by pressing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method and an apparatus for forming a slab width by a press, and more particularly, to changing the feed speed of a continuously fed slab and the moving speed of a die of a running width press to change the slab width. The width is formed while applying a compressive stress in the feeding direction, and the inside of the slab is compressed to improve the quality.

[0002]

2. Description of the Related Art In order to improve the yield reduction due to the spread of continuous casting of slabs and the accompanying slab width type reduction, it is necessary to strongly reduce the slab width. became. In this reverse width rolling, as the number of reverse passes increases, a crop portion such as a fish tail is formed at the front and rear ends of the slab, which may lower the yield.

Therefore, it has been proposed to perform slab width forming using a press machine instead of a sizing mill. The slab is fed intermittently to a press die, and the slab is stopped during pressing. In addition, a start-stop type width forming press device in which the pressing die is pressed while moving the slab according to the slab feed speed while continuously feeding the slab has been developed. . For example, in a running width forming press device, FIG.
As shown in FIG. 2, a pair of dies 1, 1 are arranged on both sides in the width direction of the slab S, and the moving direction L of the moving speed of the dies 1, 1 is synchronized with the speed Vs of the slab S in the feeding direction L. Component V of
a is set to Va = Vs, and while moving toward the downstream of the feed direction L, the molds 1 and 1 are brought close to each other to perform a wide-range reduction.

According to such a running width forming press apparatus, a large width reduction can be obtained as compared with a sizing mill, and a table roller and a metal roller can be formed as compared with a start-stop type width forming press apparatus. Since the slab S can be fed by the molds 1 and 1 itself, there is no need for a feed device for rapidly accelerating and decelerating the slab, and there are features such as no problem of temperature drop due to contact with the slab feed device.

[0005]

According to such a sizing mill or a traveling-type width forming press apparatus, since the slab is strongly pressed down in the width direction, internal defects such as zaku generated in the slab in continuous casting are produced. Was thought to contribute to improving the quality by pressing. However, under the width pressure of the sizing roller, a compressive stress was not generated in the feeding direction at the center of the slab in the width direction, but rather a tensile stress was generated, and it was impossible to crimp the zig. On the other hand, according to the running type width forming press, the tensile stress generated in the feed direction at the center in the width direction of the slab is reduced in each step because the width reduction amount is larger than that of the sizing mill, but the width forming press is not used. It was impossible to completely compress the backpack by compressive stress.

The present invention has been made in view of the above-mentioned problems of the prior art, and the width of the slab is formed by applying a compressive stress in the slab feed direction by a running width press so as to reduce the inside of the slab. An object of the present invention is to provide a method and apparatus for forming a slab width by a press capable of improving the quality by pressing.

[0007]

SUMMARY OF THE INVENTION In order to solve the problems of the above prior art, a method for forming a width of a slab by a press according to the present invention comprises:
When performing width forming by moving the slab, the compressive stress is generated in the feed direction by pushing the slab between the dies by making the feed speed of the slab larger than the moving speed component of the die in the slab feed direction. It is characterized by width forming.

The slab width forming apparatus using a press according to the present invention comprises: a slab feeder for continuously feeding a slab;
A mold moving mechanism for performing width forming by moving down a slab continuously fed between the molds while moving the slab; and a slab feed speed of the slab feeder and a slab feed direction of the mold of the mold moving mechanism. Adjusting the moving speed component and the slab feed speed
Is larger than the speed component of the die in the slab feed direction.
Press the slab between the molds to
And a speed adjusting mechanism for generating a width by generating a force .

[0009]

According to the slab width forming method by the press, the press die is moved while the slab is continuously fed.
When performing width forming with the slab, the feed speed of the slab
Make the slab larger than the moving speed component in the
Compressive stress is generated in the feed direction by
Allowed and to perform the width molding, to generate a compressive stress in the feed direction of the widthwise central portion of the slab, such as by crimping the internal Zaku slab so that improved quality.

Further, according to the slab width forming apparatus by the press, a slab feeding apparatus for continuously feeding the slab,
A mold moving mechanism for performing width forming by moving down a slab continuously fed between the molds while moving the slab; and a slab feed speed of the slab feeder and a slab feed direction of the mold of the mold moving mechanism. Adjusting the moving speed component and the slab feed speed
Is larger than the speed component of the die in the slab feed direction.
Press the slab between the molds to
A speed adjusting mechanism for generating width by forming force is provided, and the feed speed of the slab is changed by changing the feed speed of the continuously fed slab and the moving speed of the die of the running width press. The width is increased by pushing it between the molds, and a compressive stress is generated in the feed direction at the center in the width direction of the slab, and the inside of the slab is compressed to improve the quality. I have.

[0011]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing an embodiment of a slab width forming apparatus using a press according to the present invention, and FIG. 2 is a diagram illustrating the principle of a slab width forming method using a press according to the present invention. In the slab width forming apparatus 10 by this press, a pair of dies 11 are installed to face both sides in the width direction of the slab S, and each of the dies 11 has a tip end portion of a cylinder rod 13 constituting a width adjustment mechanism 12. Mounted on This cylinder rod 13 is the cylinder 1
4 is mounted so as to be able to reciprocate via a worm mechanism, and the width of the mold 11 can be adjusted by rotating the worm from outside.

A main crank mechanism 15 is connected to the end of the cylinder 14 of the width adjusting mechanism 12 so that the slab S
The die 11 can be extruded in the width direction to apply a rolling reduction force. further,
A mold moving mechanism 16 is connected to the side of the cylinder 14 so that the mold 11 can be reciprocated in the feed direction L of the slab S and the width of the slab S can be continuously fed while the slab S is continuously fed. , And is reciprocated by a crank mechanism.

A number of table rollers 18 are disposed below the slab S in the feeding direction L of the slab S of the slab width forming device 10 and are driven by a driving device (not shown). It has become.

A speed adjusting mechanism 19 is connected to a die moving mechanism 16 for reciprocating the die 11 in the feed direction L and a slab feeder 17 for feeding the slab S, and controls a rotation speed of a driving motor and the like. Feed speed Vs of slab S and mold 1
The moving speed component Va in the first feeding direction L can be adjusted.

The width reduction press of the slab S by the slab width forming apparatus 10 by the press constructed as described above is performed as follows. First, the width of the pair of molds 11 is adjusted by rotating the worm from the outside by the width adjusting mechanism 12, and the amount of reduction is set. Thereafter, the die 11 is reciprocated in the width direction of the slab S by the main crank mechanism 15 while the slab S is fed by the slab feeder 17, and at the same time, the die 11 is moved by the die moving mechanism 16 in the feed direction of the slab S. L is reciprocated, and the width reduction press is performed while continuously feeding the slab S while moving the mold 11 along the ellipse.

At the time of the press during the running, the driving motor of the die moving mechanism 16 and the driving motor of the table roller 18 of the slab feeder 17 are adjusted by the speed adjusting mechanism 19 to adjust the feed speed Vs of the slab S to the die. The width press is performed such that the speed component Va of the slab S in the feed direction is made larger than the slab S 11 and the slab S is pushed between the molds 11. Then
As shown in FIG. 2, a compressive stress .sigma.y acts in the width direction of the slab S and a compressive stress .sigma.x also acts in the feed direction L at the central portion of the slab S as shown in FIG. An internal defect such as a backpack caused by casting is pressed.

The feed speed Vs of the slab S and the mold 11
The feed speed Vs of the slab S is increased by adjusting the speed component Va in the feed direction of the slab (Vs> Va). In this case, the speed adjustment by the speed adjusting mechanism 19 is performed by adjusting only the mold moving mechanism 16. Or by adjusting only the slab feeder 17, or by adjusting both.

The feed speed Vs of the slab S is set to be larger than the speed component Va in the feed direction of the mold 11 so that the slab S
A compressive stress .sigma.x in the feed direction L is generated at the center in the width direction of the slab S. The ratio (Va / Vs) of the feed speed Vs of the slab S to the speed component Va in the feed direction of the mold 11 and the width Ws of the slab S
Whether it becomes a tensile stress or a compressive stress depends on the value of the width reduction amount ΔW and the width reduction amount ΔW. For example, the width reduction ΔW is 300 mm
And the width Ws of the slab S is 1000 m
If the relationship between the speed ratio Va / Vs and the generated stress is determined for the case of 000 m, the relationship shown in FIG. 3 is obtained.
As can be seen, the width Ws of the slab S is 1000 m.
In the case of (1), when the ratio Va / Vs of the feed speed Vs of the slab S to the speed component Va in the feed direction of the mold 11 becomes about 0.8 or less, a compressive stress σx is generated, and the width Ws of the slab S becomes 2000.
m, Va / Vs is about 0.6 or less and the compressive stress σ
x occurs and the width Ws of the slab S increases,
If the difference between the feed speed Vs of the mold 11 and the speed component Va in the feed direction of the mold 11 is made larger and the slab S is pushed more strongly into the mold 11, no compressive stress is generated.

In this manner, the width of the slab S can be formed by generating a compressive stress σx in the feed direction L at the center of the slab S in the width direction. Are crimped, and the internal quality can be improved.

In the above embodiment, the case where the table roller is used as the slab feeding device for feeding the slab has been described. However, the present invention is not limited to this, and may be constituted by another mechanism such as a pinch roller. Further, the speed adjusting mechanism for adjusting the feed speed of the slab and the moving speed of the mold is not limited to the case where the rotation speed of the driving motor is changed, and another speed adjusting mechanism may be used. Further, it goes without saying that each component may be changed without departing from the scope of the present invention.

[0021]

As described above in detail with the embodiment, according to the slab width forming method using the press of the present invention, the die of the press is moved while the slab is continuously fed.
When performing width forming by moving, the slab feed speed is
Slab by making it larger than the moving speed component in the slab feed direction
Press between the molds to generate compressive stress in the feed direction.
Since the width is formed by forming the slab, a compressive stress is generated in the feed direction at the center of the slab in the width direction, and the slab inside the slab is compressed to improve the quality.

Further, according to the slab width forming apparatus by the press of the present invention, the slab feeding apparatus for continuously feeding the slab, and the width forming by pressing down the slab continuously fed between the molds while moving the slab. a mold moving mechanism that adjusts a movement speed component of the mold of the slab feeding direction said slab feeding apparatus according to the feed speed of the slab the die moving mechanism feeding the slab
Speed is greater than the speed component in the mold slab feed direction.
In the feed direction, push the slab between the molds
Since a speed adjusting mechanism for generating width by generating compressive stress is provided, the feed speed of the slab is changed by changing the feed speed of the continuously fed slab and the moving speed of the die of the running width press. The width can be increased by pushing the mold between the molds.

Thus, a compressive stress is generated in the feed direction at the center in the width direction of the slab, and the internal quality of the slab can be improved by compressing the inside of the slab.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an embodiment of a slab width forming apparatus using a press according to the present invention.

FIG. 2 is a diagram illustrating the principle of a method for forming a slab width by a press according to the present invention.

FIG. 3 is an explanatory view showing a relationship between a ratio (Va / Vs) of a slab feed speed Vs to a speed component Va in a die feed direction and a stress generated in a feed direction at a center portion of the slab in the width direction.

FIG. 4 is an explanatory view of width forming by a conventional press.

[Explanation of symbols]

 L feed direction S slab Vs slab feed speed Va speed component in slab feed direction of die 10 slab width forming device in press 11 die 12 width adjustment mechanism 15 main crank mechanism 16 die moving mechanism 17 slab feed device 18 table Roller 19 Speed adjustment mechanism

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-258103 (JP, A) JP-A-3-81006 (JP, A) JP-A-63-2501 (JP, A) JP-A-62- 81241 (JP, A) JP-A-2-52106 (JP, A) JP-A-4-266404 (JP, A) JP-A-61-10843 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 1/02 B21B 15/00

Claims (2)

(57) [Claims] When a width of a press die is moved while a slab is continuously fed to form a width, a feed speed of the slab is made larger than a moving speed component of the die in a slab feed direction to feed the slab . A width forming method for a slab by a press, wherein a width is formed by generating a compressive stress in a feed direction by being pressed between molds. 2. A slab feeding device for feeding the slab in continuous, and the mold moving mechanism by reduction performs width forming between a die while moving the slab sent continuously, slab by the slab feed device The slab feed is adjusted by adjusting the feed speed and the speed component of the die moving mechanism in the slab feed direction.
Speed should be greater than the speed component in the die slab feed direction
And press the slab between the molds in the feed direction.
An apparatus for forming a width of a slab by a press, comprising a speed adjusting mechanism for generating a width by generating a compressive stress .