JPS617038A - Slab width decreasing device - Google Patents

Abstract

PURPOSE:To decrease the width of a slab stock which changes over a wide range to various slab widths by installing screw down devices for adjusting the slab width to a press type width decreasing device which oscillates synchronously a pair of press dies at a specified amplitude and presses the transverse direction of the slab stock to decrease the width thereof. CONSTITUTION:The hot slab stock 101 is fed from an arrow into the press type slab width decreasing device. The width of the slab stock 101 which changes over a wide range is decreased by the press type width decreasing device constituted by installing the screw down devices 202 for adjusting slab width constituted of screws and nuts for moving the dies 105 installed at both ends in the transverse direction of the slab or oscillation generating parts 103 contg. the dies 105 so as to meet the change in the slab width.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a width reducing device for hot slab material, and more particularly to a device for responding to changes in the width of a material slab.

[Background of the invention]

In recent years, most hot slab materials have been produced using continuous casting machines. However, current continuous casting machines have the drawback of not being able to efficiently produce slabs of various widths. Therefore, an effective method is to produce slabs with a constant width using a continuous casting machine, and reduce the width of the slabs to the required width using a hot rolling line. To achieve this, a technology that allows for wide range adjustment of board width is required. As a known technique for this width reduction method, a method in which intensive width rolling is performed using a pair of vertical rolls using a vertical rolling mill is known, but it has the following drawbacks.

(1) A raised portion of thickness called a dog bone occurs near the end in the width direction, which increases the amount of width return after horizontal rolling.

(2) It is not possible to significantly reduce the width in one pass, and it is necessary to reduce the width in 3 to 5 passes.

(3) Irregular shaped parts called fishtails occur at the leading and trailing ends, resulting in poor yield.

Further, as another known technique, there is a front/back end U press method. In this method, the front and rear ends of the slab are press-formed in advance using a pair of press tools having a tapered or rounded part and a straight part, and then the width is reduced using a vertical rolling machine.

Of the disadvantages (1) to (3) above, this method has the effect of preventing fishtail (3), but the other (1)
The drawback of (2) cannot be compensated for.

For this reason, a press-type width reduction method is proposed in which both widths of the slab are periodically compressed and reduced using a pair of press tools that form pressing surfaces parallel to the sides of the slab while continuously moving the slab in the longitudinal direction. Attempted. When this method is used, the raised portion of the dog bone thickness will be closer to the center and its amount will be smaller. It is also possible to significantly reduce the width. However, this method has the disadvantage that a tongue-shaped crop called a tongue is produced at the leading and trailing ends of the slab.

[Purpose of the invention]

In order to reduce the width of a slab material, which is a material for hot rolling, the present invention aims to reduce the cropped portion at the front and rear ends of the slab. In a press-type slab width reduction device that vibrates a pair of opposing press surfaces including a section, the purpose is to perform effective width reduction in response to changes in the width of a base material slab that changes over a wide range.

[Summary of the invention]

In the present invention, while a slab as a rolling material is fed in the longitudinal direction before rolling, an opposite A press-type slab width reducing device that synchronously vibrates a pair of press molds with a constant amplitude in the slab width direction, periodically presses both end faces of the slab material in the board width direction, and reduces the width over the entire length of the slab. In order to respond to changes in the material slab width that changes over time,
A plate width adjustment rolling device consisting of a screw and a nut that moves a mold installed at both ends of the slab width direction, or a vibration generating part including the mold, in the slab axis direction is installed at both ends of the slab width direction. It is characterized by being installed between a mold and a vibration generating section, or between a vibration generating section including a mold and a fixed structure.

[Embodiments of the invention]

The principle of the press-type width reduction device is shown in FIG. Hot slab material 01 is fed into the press type width reduction device from the arrow. In the press type width reducing device, a press die 105 is attached to a block 104 which is reciprocated and vibrates by a hydraulic cylinder 03 fixed to a housing 102. 1
06 is a vibration generation control device, 107 is a control amplifier, 108
indicates the hydraulic system. With this method, there is a limit to the stroke of the hydraulic cylinder, so from 1000 mm to 2
It becomes impossible to effectively reduce the width in response to a change in the base material slab width, which varies up to 200 mm. For example, if the stroke of the hydraulic cylinder is 150 strokes, the maximum width that can be reduced is 3t)Omm. If the maximum slab width on the equipment is 2200 mm, a slab with a base material slab width of 2200 mm can be reduced in width to 1900 myyn, but the width cannot be reduced at all for a slab with a base material slab width of 1900 m+n or less. In order to compensate for this drawback, as shown in FIG.
In between, the worm jack type plate width adjustment lowering device 202
Set up. In this case, if the maximum slab width on the equipment is 2200InI11, the base material slab width is 10100
For O+ width slab material, by symmetrically moving the plate width adjustment rolling down devices 202 on both sides of the slab width, the width of the slab with a base material width of 10.00 mm is reduced to 700 mm (hydraulic cylinder stroke 150 mm). I can do it.

203 and 204 are pinch holes for feeding the material slabs.

Further, the second claim will be explained with reference to FIG. The plate width adjusting rolling device shown in FIG. 2 is installed only on one side in the slab width direction, and the plate width adjusting rolling device 30 of only this one
1 corresponds to a change in the base material slab width. Therefore, as above, the maximum slab width 2
When reducing the width of a slab material of 200mm, base material slab width], 000mm, the plate width adjustment screw is 12
It is necessary to move 00mm. However, the amount of movement of 1200 mm in the screw device is achieved by a blooming mill or the like, and there is no problem at all. Rather, it becomes possible to install the worm jack type plate width adjustment screws 202, which were installed on both sides of the slab in the width direction in FIG. 2, on only one side.

However, since the hot slab material normally runs at the center of the rolling line, it is impossible to insert the slab material into a press device that moves asymmetrically with respect to the center of the rolling line, as shown in FIG. Therefore, for a press-type width reducing device as shown in Fig. 3, the center of the rolling slab is placed on the entry side of the device at the center of the rolling line, and the center of the rolled slab is placed on the opposite side from where the rolling device for plate width adjustment is installed. A side guide with off-center functionality that can be moved is required. Fig. 4 shows the combined configuration of a site guide with an off-center function and a press-type width rolling device. Normal site guides open and close symmetrically around the rolling line using a single drive device, but the
The figure shows two sets of drive devices that enable asymmetrical opening and closing. 401, 402 to side guy 1, 403.40'4
Reference numeral 405 and 406 indicate a cytokite drive motor, and 405 and 406 rank devices for driving side guides, which are opened and closed completely independently in the slab width direction.

Although the present invention has been described above using a hydraulic cylinder as the vibration generating section, there is no problem with the equipment configuration even if a motor-driven crankshaft is used.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a press-type width reducing device, and Fig. 2 is a plan view of a press-type width reducing device according to an embodiment of the present invention.

Claims (1)

[Claims] 1. While feeding a slab as a rolling material in the longitudinal direction before rolling, an opposing surface is formed, which is composed of a surface parallel to the side surface of the slab and a surface including a radiused portion that is inclined toward the entrance side of the slab with respect to this surface. In a press-type slab width reduction device that synchronously vibrates a pair of press dies at a constant amplitude in the slab width direction and periodically presses both end faces of the slab material in the board width direction to reduce the width over the entire length of the slab. , to accommodate changes in material slab width over a wide range.
A board width adjustment rolling device consisting of a screw and a nut that moves the mold installed at both ends of the slab width direction, or a vibration generating part including the mold, in the slab width direction is installed at both ends of the slab width direction. A slab width reducing device characterized by being installed between a mold and a vibration generating section, or between a vibration generating section including a mold and a fixed structure.