JPS5940522B2 - Thick plate rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate rolling machine equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and particularly relates to a plate rolling machine that is equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and particularly relates to a plate rolling apparatus that is equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and particularly relates to a plate rolling apparatus that is equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and particularly relates to a plate rolling machine that is equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and particularly relates to a plate rolling machine that is equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls. The present invention relates to a thick plate rolling apparatus that can obtain a rolled product that does not require finishing by cutting side edges, which is suitable for rolling a rolled material.

In general, when rolling thick plates, especially thick steel plates, the slab produced in continuous casting equipment or a blooming mill is first subjected to 1 to 3 passes of so-called forming rolling to adjust the thickness of the slab, and then this After turning the sheet by 90 degrees and performing tentering rolling the required number of passes to obtain the desired sheet width, the sheet is further turned by 90 degrees and returned to its original direction, so-called so-called rolling to obtain the desired sheet thickness. Finish rolling is performed the required number of passes to obtain a thick steel plate with the desired width and thickness.

However, in this rolling process, due to the difference in rolling conditions between the front and rear ends and the center of the slab, the thickness of the thick steel plate, that is, the rolled product 1.
The width shape of 0 is as shown in FIG.
It may be shaped like a drum with a narrow central part in the longitudinal direction.

This is particularly caused by tentering rolling, and its shape varies depending on the relationship between slab dimensions and finished dimensions, and as shown in Figure 3, the tentering ratio (rolling width/slab width) is approximately 1.5.
In the following, the board width difference S (the average difference between the board thickness M at the center in the longitudinal direction, the average difference between the board widths T and B at the front end in the longitudinal direction, M--) is a negative value, and the width It is known that when the extension ratio is about 1.5 or more, the plate width difference S becomes a drum shape with a positive value.
The amount can be predicted quantitatively as shown in FIG.

Note that this plate width difference has already occurred immediately after tentering rolling, and this amount does not change much until finishing rolling.

Conventionally, a rolled product 10 having a round or drum-shaped planar shape having such a plate width difference is cut into a required width dimension using a shearing machine or gas, as shown in FIG. 1 or 2. It was designated as product 12.

In order to reduce such cutting allowance and improve the yield of rolled products, improvements in bus schedules, diagonal rolling, or correction rolling have been proposed.

Among these, even in the most advanced technology of reduction correction rolling, rolled products (hereinafter referred to as edge plates) that do not require finishing by cutting the side edges at all due to the following reasons.
could not be manufactured.

That is, (1) it is not possible to obtain the precision required to produce a finished product as is with the rolling width.

The width dimension is managed by simply rolling it to a predetermined width by a tentering pass at the initial stage of rolling, as in the past, and there is no means for correcting subsequent changes.

(2) Although the planar shape is approximately rectangular compared to conventional products, it is impossible to obtain a strictly constant width over the entire length.

Further, the cross-sectional shape of the side edge portion 10a of the rolled product 10 as rolled is convex or concave as shown in FIG. 4 or FIG. 5, and since this portion does not touch the roll, the surface is rough. In any case, it had to be cut and removed.

Therefore, in manufacturing edge plates, it is necessary to have not only a thickness reduction device but also a width reduction device to achieve good width dimension accuracy and a good width shape.

On the other hand, conventionally, in hot strip rolling lines and some plate rolling lines, rolling apparatuses called edge yards equipped with vertical rolls that roll down in the width direction have been put into practical use.

However, the functions of these are to perform a width reduction called a width killing pass when obtaining a product width narrower than the slab width, and to perform width adjustment at the initial stage of rolling. As shown in FIG. 6, the shape was a so-called dogbone shape, and it was not possible to manufacture a product with good width precision and good width shape.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and it is possible to reduce the width difference in the longitudinal direction of a rolled product and to improve the shape of the side edge. An object of the present invention is to provide a thick plate rolling apparatus that can obtain a rolled product that does not require finishing by cutting.

The present invention provides a plate rolling apparatus equipped with a flat rolling mill that flat-rolls a material to be rolled using horizontal rolls, and a pair of vertical rolls that roll down the side edges of the material to be rolled from the width direction of the material, and each vertical roll on both sides. It has two pairs of horizontal rolls adjacent to the rolls that sandwich the regular edge of the material to be rolled from the front and back surfaces and roll it down in the plate thickness direction, and the rotation axes of the vertical rolls Yoshimizu Sen rolls are arranged in the same vertical plane. By doing so, the above objective has been achieved.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 7 and FIG.
2, a pair of vertical rolls 22a, 22b that are located close to the exit side of the flat rolling mill 12 and roll down both side edges of the material to be rolled 10 in the board width direction; 22a.

The edging rolling mill 20 is provided with a pair of left and right horizontal rolls 24a, b and 24c, d, which are arranged coaxially with the rolling mill 22b and roll down both side edges of the material to be rolled in the thickness direction. .

In the figure, 16 is a backup roll, and 18 is a conveyance roller.

As shown in detail in FIG. 9, the etching rolling mill 20 includes a vertical roll 22a rotatably supported by a bearing 23, which rolls down the side edge of the material to be rolled 10 in the width direction of the material, and the vertical roll. A vertical roll drive motor 30 that rotationally drives the vertical roll 22a via a bevel gear 26 and a speed reducer 28 is arranged coaxially and close to the vertical roll 22a with almost no gap between the vertical roll 22a and the vertical roll 22a. , the side edges of the material to be rolled 10 are rolled down in the thickness direction.

A horizontal roll 24a and a lower horizontal roll 24b rotatably supported by bearings 25a and 25b, which have a width sufficient to restrict the dogbone-like bulge of the rolled material 10;
a horizontal roll 1 driving motor 38 that rotates and drives the upper horizontal roll 24a and the lower horizontal roll 24b in opposite directions via universal joints 32a, 32b, /'7 Mwaltz gears 34 and a reduction gear 36; In order to move the upper horizontal roll 24a in the vertical direction according to the thickness of the material to be rolled 10, a rolling device includes a bearing 25a1, a screw 40, a nut 42, a worm wheel 44, a worm 46, and a horizontal roll rolling motor 48; A housing 52 that accommodates each of the components and is movable in the width direction of the material to be rolled 10 on the guide surface 50, and a hydraulic cylinder 54 or an electric screw nut for moving the housing 52 in the width direction. A pair of similarly configured width direction moving devices are arranged on the left and right sides of the rolled material 10.

In this embodiment, the lower horizontal roll 24b is attached to the bearing 2.
Although the housing 521 is fixedly supported via the housing 521, if it is necessary to adjust the pass line, the lower horizontal roll 24b can also be moved in the vertical direction by providing a lowering mechanism.

In this embodiment, the left and right housings are adjusted to move in the width direction according to the width of the material to be rolled 10 and a predetermined widthwise reduction amount.

Also, upper and lower horizontal rolls 24a. Between 24b and 24c, 24
The distance between d is adjusted according to the thickness of the material to be rolled 10, the amount of bulge at the end, and the like.

According to this embodiment, the side edges and side edges of the material to be rolled flat-rolled by the horizontal rolls 14 of the flat rolling mill 12 are simultaneously rolled down in the width direction and the thickness direction, respectively. It is possible to adjust the width of the rolled material and shape the side edge end face without creating a dog-bone-shaped end bulge at the edge, and the difference in width of the rolled material in the longitudinal direction is extremely small. It is possible to obtain an edge plate that has an excellent cross-sectional shape of the edge and does not require finishing by cutting the side edges.

In the above embodiment, the horizontal rolls were also driven seven times, but the horizontal rolls may not be driven.

Further, in the above embodiment, only one set of vertical rolls and horizontal rolls were disposed on the exit side of the flat rolling mill 12, but depending on the usage, multiple sets of vertical rolls and horizontal rolls may be disposed on both sides of the flat rolling mill. It is also possible.

As explained above, according to the present invention, it is possible to reduce the width difference in the longitudinal direction of a rolled product and to improve the shape of the side edges, thus eliminating the need for finishing by cutting the side edges. It has an excellent effect of being able to obtain a sharp edge plate.

[Brief explanation of drawings]

1 and 2 are plan views showing examples of the planar shape of rolled products in conventional thick plate rolling, and FIG. 3 is a diagram showing the relationship between width ratio and plate width difference in thick plate rolling. Figures 4 and 5
The figure is a cross-sectional view showing the cross-sectional shape of the side end marriage part of the rolled product at the end of rolling in conventional thick plate rolling, and FIG. 6 is a cross-sectional view showing the cross-sectional shape of the rolled material during edge rolling in thick plate rolling. FIG. 7 is a side view showing the configuration of an embodiment of the thick plate rolling apparatus of the present invention, FIG. 8 is a plan view, and FIG. 9 is a
FIG. 9 is an enlarged sectional view taken along the line N-IX in FIG. 8, showing the configuration of the etching rolling mill used in the embodiment. 10... Material to be rolled, 12... Flat rolling mill, 14... Horizontal roll, 20... Edge rolling mill, 22a. b... Vertical roll, 24 a, b y Cz
d...Horizontal roll.

Claims (1)

[Claims] 1. In a plate rolling machine equipped with a flat rolling mill that rolls the material to be rolled flat from horizontal rolls ζ, a pair of vertical rolls rolls down the side edges of the material to be rolled from the width direction of the plate, and a pair of vertical rolls on both sides. It has two pairs of horizontal rolls which sandwich the side edges of the material to be rolled from the front and back sides and roll it down in the plate thickness direction, and the rotation axes of the vertical roll and the horizontal roll are arranged in the same vertical plane. Features of thick plate rolling equipment.