JPH05123701A - Slab width forming method and device by press - Google Patents

Abstract

(57) [Summary] [Purpose] To improve quality by performing width forming while applying compressive stress in the feed direction of the slab with a running width press and crimping the zaku inside the slab. [Constitution] Slab feeder 17 for continuously feeding slab S
And a die moving mechanism 16 for performing width forming by pressing down the continuously fed slab S between the dies 11, respectively, and a feed velocity Vs of the slab S and a velocity component Va of the die 11 in the slab feed direction L. A speed adjusting mechanism 19 for adjusting and is provided. Then, the feeding speed Vs of the slab S continuously fed is set to the mold 1
The mold 11 is made larger than the moving speed Va in the feeding direction L of 1
The width molding is performed by pushing in between, a compressive stress is generated in the feed direction L at the widthwise central portion of the slab S, and the zaku inside the slab S is pressure-bonded.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In order to improve the reduction in yield due to the spread of continuous casting of slabs and the accompanying subdivision of slab width types, a strong reduction of the slab width is required and reverse width rolling is performed by a sizing mill. became. In this reverse width rolling, as the number of reverse passes increases, crop portions such as fish tails are formed at the front and rear ends of the slab, which may cause a reduction in yield.

Therefore, it has been proposed to perform width forming of the slab by using a pressing device instead of the sizing mill. The slab is intermittently fed to the press die part, and the slab is stopped at the time of pressing. A start-stop type width forming press device that keeps the state and a running type width forming press device that continuously presses the slab while moving the press die according to the feed speed of the slab have been developed. .. For example, in a running type width forming press device, as shown in FIG.
As shown in the principle of FIG. 1, a pair of molds 1, 1 are arranged on both sides of the slab S in the width direction, and the moving speed L of the molds 1, 1 is synchronized with the speed Vs of the slab S in the feed direction L. Ingredient V of
With a being Va = Vs, the molds 1 and 1 are moved closer to each other while moving toward the downstream in the feed direction L to perform strong reduction.

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

[0005]

According to such a sizing mill or running type width forming press device, since the slab is strongly pressed down in the width direction, internal defects such as zaku which occur in the slab during continuous casting. It was thought that it would contribute to the improvement of quality by crimping. However, under the width reduction by the sizing roller, the compressive stress is not generated in the width direction central portion of the slab in the feeding direction, but rather the tensile stress is generated, and the Zaku crimping is impossible. On the other hand, according to the running type width forming press, although the amount of width reduction is larger than that of the sizing mill, the tensile stress generated in the feeding direction at the widthwise center of the slab becomes smaller in each step, but the width forming press It was impossible to completely crimp the Zaku by compressive stress.

The present invention has been made in view of the above-mentioned problems of the prior art. In the running width press, width forming is performed while applying compressive stress in the feed direction of the slab, thereby removing the zaku inside the slab. An object of the present invention is to provide a method and an apparatus for forming a width of a slab by pressing, which can be pressure-bonded to improve quality.

[0007]

In order to solve the problems of the above-mentioned prior art, the method of forming the width of a slab by the press of the present invention is such that when the width of the slab is continuously formed by the die of the press while continuously feeding the slab, The width of the slab is formed by making the feed speed of the slab larger than the moving speed component of the mold in the slab feed direction and applying a compressive stress in the slab feed direction.

Further, the slab width forming apparatus by the press of the present invention comprises a slab feeder for continuously feeding the slab,
A mold moving mechanism that performs width forming by pressing down a slab that is continuously fed between molds, a slab feed rate by the slab feeder and a moving velocity component in the slab feed direction of the die of the mold moving mechanism. And a speed adjusting mechanism for adjusting and.

[0009]

According to the slab width forming method by this press, the feed speed of the slab continuously fed and the moving speed of the die of the running width press are changed to increase the feed speed of the slab to a metal mold. The width is formed by pressing it between the molds.Compressive stress is generated in the feed direction at the center of the slab in the width direction, and the zaku inside the slab is crimped to improve quality. There is.

According to the slab width forming device by this press, a slab feeding device for continuously feeding the slab,
Speed for adjusting the slab feed speed and the slab feed direction movement speed component of the die moving mechanism of the running width press that performs width forming by pressing down the slab that is continuously fed between the dies An adjustment mechanism is provided so that the feeding speed of the slab that is continuously fed and the moving speed of the die of the running width press can be changed to increase the feeding speed of the slab and push it between the dies. Width forming is performed to generate a compressive stress in the feed direction at the center of the slab in the width direction, and the inner surface of the slab is crimped to improve the quality.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view according to an embodiment of a slab width forming apparatus by a press of the present invention, and FIG. 2 is a principle explanatory view of a slab width forming method by a press of the present invention. In the slab width forming device 10 by this press, a pair of molds 11 are installed so as to face each other in the width direction of the slab S, and each mold 11 constitutes a tip end portion of a cylinder rod 13 that constitutes a width adjusting mechanism 12. Installed on. This cylinder rod 13 is a cylinder 1
4 is reciprocally mounted via a worm mechanism, and the width of the mold 11 can be adjusted by rotating the worm from the outside.

A main crank mechanism 15 is connected to the end of the cylinder 14 of the width adjusting mechanism 12 to form a slab S.
A pressing force can be applied by extruding the respective dies 11 in the width direction. further,
A mold moving mechanism 16 is connected to a side portion of the cylinder 14 so that the mold 11 can be reciprocally moved in the feeding direction L of the slab S to continuously feed the slab S to perform width pressing between the runs. The crank mechanism is designed to reciprocate.

A plurality of table rollers 18 are arranged as a slab feeder 17 for feeding the slab S below the slab S in the feed direction L of the slab width forming device 10 and are driven by a driving device (not shown). It is like this.

A speed adjusting mechanism 19 is connected to a mold moving mechanism 16 that reciprocates the mold 11 in the feed direction L and a slab feeder 17 that feeds the slab S, and controls the rotation speed of a drive motor. Slab feed rate Vs and mold 1
The moving speed component Va in the feeding direction L of 1 can be adjusted.

The width reduction pressing of the slab S by the slab width forming device 10 by the press configured as described above is performed as follows. First, the width adjusting mechanism 12 externally rotates the worm to adjust the width of the pair of molds 11 to set the amount of reduction. After that, while the slab S is being fed by the slab feeder 17, the die 11 is reciprocally driven in the width direction of the slab S by the main crank mechanism 15, and at the same time, the die moving mechanism 16 moves the die 11 in the feeding direction of the slab S. The width reduction pressing is performed while the slab S is continuously fed by reciprocally driving the L and moving the die 11 along the ellipse.

At the time of this running width press, the drive motor of the mold moving mechanism 16 and the drive 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 mold. The width press is performed by making the slab S into the space between the molds 11 by making it larger than the velocity component Va of the slab S in the feed direction of the slab 11. Then,
As shown in FIG. 2, a compressive stress σy acts in the width direction of the slab S in the widthwise center of the slab S, and a compressive stress σx also acts in the feed direction L, so that the slab S continues in the center of the slab S. Internal defects such as Zaku caused by casting are crimped.

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 of the slab in the feed direction (Vs> Va). In this case, the speed adjustment by the speed adjusting mechanism 19 is performed by adjusting only the mold moving mechanism 16. It may be determined as appropriate, such as performing the adjustment, adjusting only the slab feeder 17, or adjusting both.

The feed velocity Vs of the slab S is set to be larger than the velocity component Va of the die 11 in the feed direction.
A compressive stress σx in the feed direction L is generated in the central portion in the width direction of the slab S. The ratio (Va / Vs) of the feed velocity Vs of the slab S to the velocity component Va of the die 11 in the feed direction and the plate width Ws of the slab S are set.
Depending on the value of the width reduction amount ΔW, whether the stress is tensile stress or compressive stress changes. For example, the width reduction ΔW is 300 mm
When the width Ws of the slab S is 1000 m and 2
When the relationship between the speed ratio Va / Vs and the generated stress is obtained 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 this case, when the ratio Va / Vs of the feed velocity Vs of the slab S and the velocity component Va of the die 11 in the feed direction becomes about 0.8 or less, the compressive stress σx occurs and the width Ws of the slab S is 2000.
In the case of m, Va / Vs is about 0.6 or less and compressive stress σ
When x occurs and the width Ws of the slab S increases, the slab S
The compressive stress does not occur unless the difference between the feeding speed Vs of V and the velocity component Va in the feeding direction of the die 11 is made larger and the slab S is pushed into the die 11 more strongly.

In this way, since the compressive stress .sigma.x in the feed direction L is generated in the widthwise central portion of the slab S to perform the width forming, internal defects such as zakus generated in the central portion of the slab S due to continuous casting. Can be crimped to improve the internal quality.

In the above embodiment, the table roller is used as the slab feeding device for feeding the slab, but the present invention is not limited to this, and it 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 drive motor is changed, and another speed adjusting mechanism may be used. Further, it goes without saying that each constituent element may be changed without departing from the scope of the present invention.

[0021]

As described above in detail with reference to the embodiments, according to the slab width forming method by the press of the present invention, the feeding speed of the continuously fed slab and the die of the running width press can be improved. By changing the moving speed and increasing the feed speed of the slab to push it between the molds, width forming was performed.Therefore, compressive stress was generated in the feed direction at the center of the slab in the width direction, and It is possible to improve the internal quality by crimping the inside zaku and the like.

Further, according to the slab width forming apparatus by the press of the present invention, the slab feeder for continuously feeding the slab and the die for performing the width forming by pressing down the continuously fed slab between the dies. Since the moving mechanism and the speed adjusting mechanism for adjusting the feed speed of the slab and the moving speed component of the mold in the slab feed direction are respectively provided, the feed speed of the slab continuously fed and the running width press It is possible to perform width forming by changing the moving speed of the mold and increasing the feed speed of the slab so as to push it between the molds.

As a result, a compressive stress is generated in the feed direction at the center of the slab in the width direction, and the inner surface of the slab can be crimped to improve the internal quality.

[Brief description of drawings]

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

FIG. 2 is an explanatory view of the principle of the slab width forming method by the press of the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a ratio (Va / Vs) of a feed velocity Vs of a slab and a velocity component Va of a mold in a feed direction, and a stress generated in a feed direction at a widthwise central portion of the slab.

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

[Explanation of symbols]

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

Claims (2)

[Claims] 1. When performing width forming with a press die while continuously feeding the slab, the feed rate of the slab is made larger than the moving velocity component of the die in the slab feed direction and compressed in the slab feed direction. A width forming method for a slab by pressing, which is characterized in that a width is formed by applying stress. 2. A slab feeder for continuously feeding slabs, a die moving mechanism for width-forming the slabs continuously fed between the dies, and a slab feed rate by the slab feeder. A slab width forming apparatus by a press, comprising a speed adjusting mechanism that adjusts a moving speed component of the mold moving mechanism in the slab feed direction of the mold.