JP2680503B2 - Universal rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal rolling machine used for hot rolling H-section steel, and more particularly to a universal rolling machine which uses the same rolling line and has different flange widths.
In the case of rolling shaped steel (roll chance free rolling of flange width), the roll center of the vertical roll of the rolling mill is quickly matched with the center of the flange width of the H-shaped steel to be rolled, and the rolling line stop time is reduced. It is intended to further shorten the

[0002]

2. Description of the Related Art In order to produce H-section steel by hot rolling mainly from blooms and beam blanks produced by continuous casting, the material to be rolled is efficiently finished to a target size and shape, and a break generally occurs. A dedicated production facility is used which is a combination of a rough universal rolling mill group consisting of a down rolling mill, a universal rolling mill and an edger rolling mill and a finishing universal rolling mill arranged downstream of this (Figs. 6 and 7). reference).

In such equipment, rolled materials such as slabs, blooms or beam blanks (see FIGS. 8a-c)
Are sequentially passed through a roll having a plurality of hole shapes (see Fig. 9) until a shape suitable for the subsequent intermediate rolling is obtained, and the roughly-rolled material is then subjected to one or more rough universals. Intermediate rolling was performed in one pass or in multiple passes by a rolling mill and one or more edger rolling mills, and further finished in one pass in a finishing universal rolling mill (see FIGS. 10a to 10c).

The rough and finish universal rolling mill used during hot rolling of H-section steel is equipped with a pair of horizontal rolls and vertical rolls for sandwiching the material to be rolled vertically (see FIG. 11). The center of the flange width of the shaped steel matches the roll center of the vertical roll, and the vertical distance from the roll center of the vertical roll to the roll surface of the roller table placed before and after the rolling mill is 1/2 of the flange width. They are almost in agreement (see Figure 12).

[0005] Here, for example, rolling in which the inner width of the web of H-section steel (dimension of the height of the web minus the thickness of the flange) is left unchanged and only the flange width is changed (for example, the height of the web is 700 mm, the width of the flange is 300 mm). For example, when rolling H-section steel with a web height of 700 mm and a flange width of 250 mm from H-section steel, the center of the flange width of the H-section steel and the center of the vertical roll are displaced (horizontal roll). However, the web biting position is displaced, but the position can be adjusted easily.) It is therefore essential to remove the rolling mill from the line and adjust the vertical level of the vertical rolls at the roll shop. It takes a lot of time and labor to change the number of items or the rolling mill.
You have to stop the rolling line for a long time,
There has been a demand for further shortening of the time required for this.

As an attempt to cope with such a problem, Japanese Patent Laid-Open No. 59-174205 discloses a vertical roll by arranging a liner between a projection formed on a roll chock of a vertical roll and a chock guide, and inserting and removing the liner appropriately. An apparatus having a mechanism for moving the up and down is disclosed (see FIG. 13).

[0007]

However, the technique disclosed in this publication is a so-called off-line type in which the vertical level of the vertical roll cannot be adjusted unless the vertical roll is taken out from the housing of the rolling mill together with the roll chock. However, the level adjustment still has a problem that it is troublesome, and the level adjustment range is very narrow because the level adjustment can be performed only by the thickness of the liner, and the practicality is poor.

In this regard, in the newly established rolling mill, table rollers are arranged in front of and behind the rolling mill so that the material to be rolled can be moved up and down according to the change in the flange width of the H-section steel, and the rolling mill main body An Elevator was installed between this rolling mill and the sole plate on which it is mounted and fixed, and this device eliminated the deviation of the center of the bunge width. Although measures have been taken to enable rolling, in existing equipment, it is easy to cause a significant increase in equipment cost if an expensive lifting mechanism is installed for the entire table roller corresponding to the as-roll length of the material being rolled. It cannot be modified. Moreover, in the existing rolling equipment, there is a limit to the space for arranging the vertical roll elevating device, and the present situation is to deal with it by partially changing the rolls or the stands. .

An object of the present invention is to propose a universal rolling mill in which the level (pass line) above and below a vertical roll incorporated in a rolling mill is newly installed, and can be arbitrarily and quickly changed online regardless of existing equipment. Where it is.

[0010]

The present invention provides a universal rolling mill in which a pair of horizontal rolls and a pair of vertical rolls are incorporated in a housing, wherein the universal rolling mill has a housing of the universal rolling mill via a liner plate. Of the sole plate, the lifting mechanism for moving the housing up and down together with the rolls, and the gap between the housing and the liner plate caused by the operation of the lifting mechanism, or the liner plate and the sole plate. Equipped with a spacer liner mounting mechanism that controls the insertion and removal of the spacer liner into and from the gap, and sandwiches the sole plate via the liner plate in cooperation with the housing on the side opposite to the side on which the housing of the sole plate is placed. A detachable mechanism for fixing and holding the housing is arranged. A universal rolling mill, wherein.

1 and 2 show the structure of a universal rolling mill according to the present invention in terms of its side surface and front face, respectively. In FIG. 1, reference numeral 1 denotes a housing of the universal rolling mill, and this housing 1 has a horizontal roll a ₁ , A ₂ and vertical rolls v ₁ , v ₂ are incorporated. Reference numeral 2 is a sole plate on which the housing 1 of the rolling mill is mounted, and 3 is a detaching mechanism for firmly fixing and holding the housing 1 placed on the sole plate 2. The detaching mechanism 3 is a guide provided on the housing 1. The slide block 3a is configured to be capable of moving back and forth along the la 1a, and a plurality of liners 3b fixed to the slide block 3a with bolts B and connecting the sole plate 2 and the slide block 3a. 4 is a hydraulic cylinder which is connected to the slide block 3a through a mounting metal fitting 4a and drives the slide block 3a. A pressure cylinder, 6 is a rail for pulling out the rolling mill from the rolling line, 7 is a wheel provided at the bottom of the housing 1, and 8 is a wheel.
Is an elevating mechanism (a hydraulic cylinder or the like is applied) for moving the housing 1 up and down together with the rolls a ₁ , a ₂ , v ₁ and v ₂ , and the elevating mechanism 8 is, in this example,
It is shown as an integral structure connected to the bottom of the rail 6.
Further, 9 is a liner plate for adjusting the upper and lower levels of the rolling mill, and this liner plate 9 is arranged between the sole plate 2 and the housing 1. Reference numeral 10 denotes a spacer liner mounting mechanism composed of a spacer liner 10a and a hydraulic cylinder 10b. The mounting mechanism 10 creates a gap between the housing 1 and the sole plate 2 (in this example, the liner plate 9 is arranged). Therefore, in practice, it is arranged in either the gap formed between the housing 1 and the sole plate 2 or the gap formed between the liner plate 9 and the sole plate.)
The spacer liner 10a is inserted into or removed from the spacer liner 10a. Reference numeral 11 is a roller table for conveying the material S to be rolled, 12a and 12b are roll chocks of horizontal rolls a ₁ and a ₂ , and 13a and 13b are roll chocks of vertical rolls v ₁ and v ₂ .

The material S to be rolled, which has been roughly shaped by performing the breakdown rolling, is conveyed to the rough universal rolling machine by the roller table 11 and rolled to a predetermined sectional shape. At this time, as shown in FIG. 1, the lower end of the flange S _f of the material S to be rolled is on the roller table 11, and the center of the flange width b and the center of the roll cylinder of the vertical rolls v ₁ and v ₂ of the rough universal mill are It is supposed to match. That is, the distance H ₁ from the lower end of the housing 1 until the center of the roll body of the vertical rolls v _1, v _2, the distance of H ₂ from the upper surface of the sole plate 2 up to the upper surface of the roller table 11 become constant ing. Therefore, when rolling such that the width b of the H-section steel is changed, the dimension H ₃ changes. Accordingly, it is necessary to vertically move the vertical roll in the housing of the rolling mill. The horizontal rolls a ₁ and a ₂ do not pose a particular problem because they can be moved freely and relatively quickly up and down within the housing by adjusting the roll roll down mechanism.

Here, for example, in a rolling facility for rolling H-section steel having a web height of 700 mm and a flange width of 200 mm, when only the flange width of the H-section steel is changed to 250 mm, It is necessary to move the horizontal roll as well as the vertical roll by 1/2 of the flange width difference, that is, (250-200) / 2 = 25 mm.

If each roll can be quickly moved in the housing by the above amount, it is not necessary to change the rolls or the stands, and the line down time can be shortened to significantly improve the operation rate. Of.

According to the present invention, the housing 1 of the rolling mill is lifted by the elevating mechanism 8 so that the gap between the housing 1 and the sole plate 2 has an appropriate thickness (flange width of 200 mm to 250 mm).
When changing to mm, use those with a thickness difference of 25 mm. It is intended to adjust the roll centers of the left and right vertical rolls v ₁ and v ₂ online by inserting or withdrawing the spacer liner 10 a which becomes Since rolling is possible, there is no need to change rolls, and line down time can be shortened as much as possible. Also, the vertical roll lifting mechanism is extremely compact and has a simple structure, so that there is no major modification to existing equipment.

To set the roll center of the vertical rolls v ₁ and v _{2 above} the current roll center (when the flange width is wider than the current roll center), as shown in FIG. 3, the hydraulic cylinder 4 is used. Slide block 3a
Is retracted in a direction away from the sole plate 2 to release the fixedly held state between the housing 1 and the sole plate 2 which are firmly connected by the clamping pressure between the liner 3b and the liner plate 9 arranged on the lower surface of the housing 1.

Next, after the housing 1 of the rolling mill is lifted by the lifting mechanism 8, as shown in FIG. 4, the spacer liner mounting mechanism 10 changes the flange width in the gap between the housing 1 and the sole plate 2. While inserting the spacer liner 10a having an appropriate thickness according to the above, it is necessary to adjust the height of the liner 3b by the amount of insertion of the spacer liner 10a, so that the spacer plate 5a previously inserted is liquid. It is pulled out by the operation of the pressure cylinder 5.

Then, the slide block 3a is again returned to the initial position by the hydraulic cylinder 4, and the sole plate 2 is pinched by the liner plate 9 and the liner 3b so that the housing 1 is firmly fixed and held on the sole plate 2. In this state, the H-section steel having the next size is rolled.

As described above, according to the present invention, the distance from the upper surface of the roller table 11 to the vertical rolls v ₁ and v ₂ is changed by properly using the liner plate 9 and the spacer liner 10a and the liner 3b and the spacer plate 5a. Therefore, if the rolling mill with such a configuration is placed in the rough rolling process and the finish rolling process in advance, it is not necessary to replace the rolling mill, and the roll chance-free rolling of the flange width of H-section steel is possible. Can be easily realized. Although FIGS. 1 and 2 above show the exchange type in which the main body of the rolling mill can be drawn completely from the rolling line, it is needless to say that it can be applied to a stationary type rolling mill.

Since the edger rolling machine is composed of only the upper and lower horizontal rolls, the roll position can be freely changed so that there is no particular problem.

In the rolling machine having the above construction, when the roll centers of the vertical rolls v ₁ and v ₂ are set lower than the present condition (when the dimension of the flange width of the H-section steel is small), As shown in FIG. 3 above, the connection between the housing 1 and the sole plate 2 is released, the housing 1 is lifted up to remove the spacer liner 10a, and then the spacer liner between the liner 3b and the slide block 3a of the attaching / detaching mechanism 3 is removed. The spacer plate 5a having the same thickness as 10a may be inserted. In addition, in order to easily insert the spacer plate 5a between the liner 3b and the slide block 3a when making such a setting, the liner 3b and the spacer plate 5a should be shaped as shown in FIGS. 5a and 5b. Is preferred.

The spacer liner 10a and the spacer plate 5a described above are prepared in various thicknesses in advance, thereby greatly expanding the types of H-section steel that can be rolled by one rolling mill. It is advantageous to

[0023]

[Example] Rolling of H-section steel in which only the flange width is changed by applying a rolling mill having a universal rolling mill configured as shown in Figs. 1 and 2 above (flange width is 200 m
m, 250 mm). As a result, in the conventional method that requires the work of completely replacing the rolling mill, it took about 20 to 25 minutes, but when the rolling mill according to the present invention is applied, the setting time of the roll position required for the size change is about It can be done in about 5 minutes and is 15 ~ per chance
It was confirmed that the time could be shortened to about 20 minutes, and that the quality of the obtained product had no problem. The number of reassembling of rolling mills is about 30-40 when compared with the same throughput.
It was possible to reduce the number of times / month.

[0024]

As described above, according to the present invention, it is not necessary to change the rolling mill when performing rolling such that only the width of the flange is changed using the same equipment. The time required for rolling can be shortened by about 15 to 20 and the production efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a rolling mill according to the present invention.

FIG. 2 is a diagram showing a configuration of a rolling mill according to the present invention.

FIG. 3 is an explanatory diagram of how to attach and detach the housing.

FIG. 4 is an explanatory diagram of how to attach and detach the housing.

5 (a) and 5 (b) are views showing a relationship between a spacer liner 5a and a liner 3b.

FIG. 6 is a diagram schematically showing rolling equipment for H-section steel.

FIG. 7 is a diagram schematically showing rolling equipment for H-section steel.

FIG. 8A is a view showing a cross section of a slab. (b)
FIG. 4 is a view showing a cross section of a bloom. (c) is a view showing a cross section of the beam blank.

FIG. 9 is a view showing a shape of a hole type used in rolling H-section steel.

FIG. 10 (a) is a diagram showing a rolling situation by a rough rolling mill. (b) is the figure which showed the rolling condition by an edger rolling mill. (c) is a diagram showing a rolling situation by a finish rolling mill.

FIG. 11 is a diagram showing an arrangement state of rolls of a universal rolling mill.

FIG. 12 is a diagram showing the relationship between the center of the flange width of H-section steel and the roll center of a vertical roll.

FIG. 13 is a diagram showing an example of a vertical roll elevating mechanism of a universal rolling mill.

[Explanation of symbols]

1 Housing 2 Sole Plate 3 Detaching Mechanism 3a Slide Block 3b Liner 4 Hydraulic Cylinder 4a Mounting Bracket 5 Hydraulic Cylinder 6 Rail 7 Wheels 8 Lifting Mechanism 9 Liner Plate 10 Spacer Liner Mounting Mechanism 10a Spacer Liner 10b Hydraulic Cylinder 11 Roller Table 12a Roll chock 12b Roll chock 13a Roll chock 13b Roll chock 14 Breakdown rolling mill 15 Rough universal rolling mill 15a Rough universal rolling mill 15b Rough universal rolling mill 16 Edger rolling mill 17 Finishing universal rolling mill 18 Slab 19 Bloom 20 Beam blank 21 Hole 22 Horizontal roll 23 vertical roll 24 edger roll 25 horizontal roll 26 vertically roll 27 horizontal roll 28 vertical roll 29 the material to be rolled 30 roller guides 31 edger roll a ₁ horizontal roll a ₂ horizontal roll v ₁ vertical row v ₂ vertical roll S material to be rolled

Claims (1)

(57) [Claims] 1. A universal rolling mill in which a pair of horizontal rolls and a pair of vertical rolls are incorporated in a housing, wherein the universal rolling mill has a sole plate on which the housing of the universal rolling mill is mounted via a liner plate, An elevating mechanism for moving the housing up and down together with each roll, and a spacer liner in the gap between the housing and the liner plate generated by the operation of the elevating mechanism or in the gap between the liner plate and the sole plate. A spacer liner mounting mechanism that controls the loading and unloading of the sole plate, and an attachment / detachment mechanism that sandwiches the sole plate via the liner plate under the cooperation of the housing on the side opposite to the side on which the housing of the sole plate is mounted, and holds the housing in place. Universal that is characterized by arranging Rolling mill.