JPH0761484B2 - Shaped steel rough rolling method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rough rolling method for a shaped steel, particularly a large H-shaped steel, using a breakdown rolling mill (rough rolling mill) having horizontal hole type rolls. The present invention relates to a rough rolling device. More specifically, the present invention relates to a shaped steel rough rolling method and shaped steel rough rolling apparatus capable of reducing the number of edging rollings and the turn operation before and after edging rolling by installing vertical rolls.

(Prior Art) First, conventional rough rolling of H-section steel will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a cross section of a hole-type roll of a conventional breakdown rolling mill. The upper and lower horizontal hole type rolls 1a and 1b are hole type I, II, IV, V and box type hole type II for forming H-shaped steel.
I have. FIG. 3 (a) shows the position of the cross section of the rolled material 2 at the time of shaping rolling by the hole types I, II, IV and V, and the biting-out portion A caused by the gap between the rolls 1a and 1b at the time of shaping rolling.
Indicates. On the other hand, FIG. 3 (b) shows the position of the rolled material during the edging rolling by the hole type III. In this way, in rough rolling of H-section steel, the bite portion produced in shaping rolling is reduced by edging rolling each time, and the beam blank or slab is gradually rolled to a predetermined cross-sectional shape while reversing a large number of rolling passes. (Fig. 2 shows a part of the path with an arrow).

Therefore, in the conventional rough rolling of H-section steel, the ratio of the number of passes of edging rolling is large, and it may reach 60% depending on the rolling method. Moreover, when the edging rolling is performed after the shaping rolling, it is necessary to rotate the rolled material at the position shown in FIG. 3 (a) by 90 ° to the position shown in FIG. 3 (b). Conversely, when shaping rolling is performed after edging rolling, it is necessary to return the rolled material from the position shown in FIG. 3B to the position shown in FIG. Therefore, the edging rolling not only increases the number of passes, but also takes time to turn (rotate) the rolled material before and after the rolling, which is extremely inefficient.

Therefore, the present applicant has already proposed in JP-A-53-56145 a universal breakdown rolling method and rolling apparatus in which a vertical roll is arranged immediately before or after a hole-type horizontal roll. The proposal of this publication aims at omitting the edging pass by carrying out edging rolling by a vertical roll at the same time as shaping rolling by a horizontal roll.

(Problems to be Solved by the Invention) It has already been explained that the efficiency of the conventional shaped steel rolling method, which requires a large number of edging passes, is very poor. That is, not only a large number of edging passes are required, but also it takes time to turn the rolled material before and after the edging pass, which is extremely inefficient.

On the other hand, in Japanese Patent Laid-Open No. 53-56145, the side guides on the front and rear surfaces of the rough rolling mill are eliminated to add a vertical roll housing, and the housing itself is moved.
Therefore, application to existing equipment requires significant modification and is costly.

Therefore, an object of the present invention is to provide a rough rolling method and a rough rolling apparatus for a shaped steel capable of omitting a part of the edging path and significantly improving the efficiency with a simple configuration that can be easily applied to existing equipment. Is.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present inventor has conducted experiments and researches and has paid attention to the fact that the edging rolling in the rough rolling of shaped steel is sufficiently effective even under a light pressure. For example, the rolling load of the edging rolling in the H-shaped steel rough rolling using the beam blank as a material is about 50 tons to 150 tons, which is lower than the load of the general shaping rolling (1000 to 1500 tons).
Therefore, in this case, it is sufficient for the vertical roll for edging rolling to have a load capacity of 200 tons or less. With this level of load, it is sufficient to withstand vertical rolls on the manipulators on the front and back of the existing breakdown mill.

The present inventor has conducted further research based on the above idea, and completed the present invention. Thus, the gist of the method of the present invention is to provide a flat non-driven vertical roll on each manipulator on the front and rear surfaces of the breakdown rolling mill, and use the horizontal hole-type rolls to form the hole-shaped biting portions produced on the rolled material during shaping rolling. It is a shaped steel rough rolling method characterized by rolling with a vertical roll.

Further, the gist of the apparatus of the present invention is to provide a breakdown rolling machine provided with a pair of driving horizontal rolls having a rough-rolling hole die, and to move and roll the rolled material laterally on the front and rear surfaces of the breakdown rolling machine. In the rough rolling apparatus for shaped steel, which comprises one to two sets of manipulators, a pair of flat non-driven vertical rolls protruding from the guide surface are provided on the rolling mill side of each of the manipulators. It is a shaped steel rough rolling device.

(Operation) The operation of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the vertical rolls 3a and 3b according to the present invention are
The bite-out portion A generated in the rolled material 2 as a result of the shaping and rolling by the horizontal hole rolls 1a and 1b is pressed. The edging rolling with the vertical rolls 3a and 3b rolls down only the range shown by the symbol 1 in FIG. 4, and the rolling load is about 50 to 150 tons. Therefore, the vertical roll installed in the manipulator can sufficiently withstand. Since the vertical rolls are non-driving, the edging rolling is the inward rolling by the driving horizontal rolls.

As shown in FIG. 5, the vertical rolls 3a and 3b should be installed as close to the breakdown rolling mill 4 as possible. This is because the vertical rolls are not driven and rolling can be performed only while the rolled material is being pushed in by the breakdown rolling mill. Still, near the leading and trailing edges of the rolled material, there is a portion that cannot be edging rolled in one pass, but by providing vertical rolls on the manipulators on the front and rear surfaces of rolling mill 4, either vertical roll can be used during reversible rolling (Fig. 5). Then, only the manipulators 5a and 5b on one side of the rolling mill 4 are shown).

The rolling force P of the vertical rolls 3a and 3b uses the opening / closing driving force of the manipulators 5a and 5b and is adjusted by suppressing the output of the drive motor.

As described above, the rolling load of the vertical rolls according to the present invention is about 50 tons to 150 tons, so the present invention is suitable for the raw rolling of the section steel made of the beam blank.

(Examples) Next, rough rolling of H-section steel with product size H600 × 300 using a breakdown rolling machine having horizontal hole type rolls 1a and 1b shown in FIG. Compare your pass schedules.

The following table is an example of the pass schedule in the conventional rough rolling of H-section steel.

In the rough rolling according to the present invention, in the above pass schedule table, the light rolling edging pass by the hole type II marked with * is omitted, and instead of this, vertical rolls 3a, 3b (Fig. 5)
The edging rolling by can be performed simultaneously with each previous pass. Therefore, 6 of the conventional 19 passes are omitted and rough rolling is completed in 13 passes. Furthermore, the turn process marked with * becomes unnecessary. As a result, the rolling time, which conventionally required 244 seconds, can be reduced to 150 seconds. This is a reduction in rolling time of 38.5%.

The present invention can be applied to edging rolling with a rolling load of 200 tons or less even in general shaped steel rolling, and is suitable not only for H-shaped steel but also for raw rolling of general shaped steel.

(Effects of the Invention) Since the present invention is configured as described above, it has the following effects.

The edging path and turn operation of conventional breakdown rolling can be omitted. Therefore, the rolling time can be shortened by 25% to 45% and the efficiency can be greatly improved.

The equipment cost is low because it is sufficient to add a simple vertical roll to the existing rolling mill.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a vertical roll and a horizontal hole type roll of the present invention; FIG. 2 is a cross sectional view of a hole type portion of a horizontal hole type roll of a conventional breakdown rolling mill; FIG. 4A is a cross-sectional view of a rolled material, in which FIG. 4A shows a position at the time of shaping rolling, and FIG. 4B shows a position at the time of edging rolling; FIG. 4 shows a rolling region by a vertical roll of the present invention. Fig. 5 is a partial sectional view of the material; Fig. 5 is a plan view of the manipulator showing the installation position of the vertical roll of the present invention; and Fig. 6 is the breakdown rolling used when comparing the present invention with the conventional rolling pass schedule. FIG. 3 is a sectional view of a hole forming portion of a horizontal hole forming roll of the machine. 1a, 1b: Horizontal hole type roll 2: Rolled material 3a, 3b: Vertical roll 4: Breakdown rolling machine 5a, 5b: Manipulator

Claims (2)

[Claims] 1. A flat non-driving vertical roll is provided on each of the manipulators on the front and rear surfaces of the breakdown rolling mill, and the hole-shaped biting portion generated in the rolled material during the shaping and rolling by the horizontal hole-type roll is rolled by the vertical roll. A method for roughly rolling shaped steel. 2. A breakdown rolling mill provided with a pair of driving horizontal rolls having a rough-rolling hole die, and a pair of pairs for laterally moving and rolling rolled material on the front and rear surfaces of the breakdown rolling mill. And a pair of flat non-driving vertical rolls protruding from the guide surface on the rolling mill side of each of the manipulators.