JPS5950961A - Continuous casting method of beam blank - Google Patents

Abstract

PURPOSE:To produce economically plural kinds of beam blanks with a single continuous casting device by determining sizes with the flanging width kept at a specified value with all kinds of beam blanks and performing continuous casting. CONSTITUTION:The spacing distance 9a (flanging width) between the web surface 7a and flange end 8a of a beam blank 1a as well as the spacing distance 9b (flanging width) between the web surface 7b and flange end 8b of a beam blank 1b are made the same. There is therefore no need for moving the positions of flange end support rolls 4b, 4d and a web support roll 2b even if the size of the beam blank differs. Flange end support rolls 4a, 4c and a web support roll 2a need be moved in position in the stage of changing the blank 1a to 1b, but the widths 9c, 9d are the same and therefore the rolls 4a, 4c and the roll 2a are moved in position without breaking the mutual positional relation.

Description

[Detailed description of the invention] The present invention relates to a continuous casting method for beam flanks.

Especially curved! , I, iI provides a continuous casting method for offshore continuous casting.

Well-known process HJl': Beam blank with +5 profit, such as steel or T-shape 41゛4. A method of creating νj has been tried and some have been put into practical use.

By the way, since the H-section steel and upper section steel that are the final products have various dimensions and there are many restrictions on If and elongation conditions, many types of beam blank slabs are also required. However, in continuous casting, if there are many types of beam blank slabs, it becomes necessary to prepare many types of molds, and the roll guide device must also be replaced, which increases equipment costs. Undesirable.

Furthermore, because the order quantities for each type of steel section 3 and section steel 1 are generally small, frequent mold changes are often required; therefore, continuous casting of beam blanks has been seen as uneconomical. .

Therefore, the present inventors investigated various casting conditions and rolling conditions, and from one type of beam blank to many types of n, ■Jl'
Although we have developed a rolling method that can produce Z-shaped steel, there are many types of steel, including II-shaped steel, so current rolling technology requires multiple types of beams in order to handle all types of H-shaped steel. It was found that blank slabs were required.

By the way, in order to cast multiple types of beam blanks,
It is sufficient to prepare a corresponding number of molds, but the slab support roll (flange support port =
All rollers, web support rolls, pinch rolls, pending rolls, etc.) must be of variable position type or must be replaced, resulting in extremely high equipment costs, so economic efficiency is the key point. The advantages of continuous casting are 11
It will be done.

Therefore, in order to overcome the above-mentioned difficulties, we have carried out repeated research, and as a result, we have developed the present invention, in which multiple types of beam blanks are continuously cast using a single continuous casting device, for all types of beam blanks. We developed a continuous casting method by setting the flank width to a constant value and determining the J method, and succeeded in manufacturing beam blanks economically.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of an eight-sided roll support device that supports a slab of mold type 1. Since the solidified layer of the beam blank 1 immediately after casting is thin, as shown in FIG.
2b-flange support roll 3a;

3b, flange tip support rolls 4a, 4b,
4c.

4d is closely supported to prevent bulging. 5a to 5h are the approximate details of the roll position moving device.

As mentioned above, each time the dimensions of the beam flank slab 1 change, the position moving device is operated to move each of the o-rolls to a predetermined position. Providing the movable devices 5a to 5h increases the initial amount of cast iron, complicates the equipment, and makes maintenance difficult. That is, the key to improving economical efficiency is to reduce the number of position moving devices as much as possible.

Therefore, the present inventors investigated various casting conditions and rolling conditions, and succeeded in significantly reducing equipment costs and maintenance costs by setting the flange width of the beam blank to a constant value as described above.

FIG. 2 is a schematic diagram showing half cross-sections of the beam blank la with a thin web on the left and the beam blank 11 with a thick web on the right from the center line 6, and shows the web surface 7a of the beam blank 1a and the tip of the flange. Separation distance 9a from 48a
(that is, one side width of the flank) and the distance between the web surface 7b of the beam blank 1b and the flange tip 8a! I'1. ! *
1t91) (that is, flank width) are the same.

Therefore, there is no need to move the positions of the flange tip support rolls 4b, 4d and the beam blank to be manufactured by the web support roll 2bdMf, even if the distance between the two is 100 mm or 100 mm. Therefore, there is no need to provide a position moving device for iCare IE, and both equipment costs and maintenance costs can be reduced significantly.

In addition, the flange tips in FIG. 2 (1-rules 4.a, 4c and web support roll 2a must be moved in position when changing from casting of beam blank 1a to construction of beam blank lb).1. However, since the flange single widths 9c and 96 are the same in this case, the flange support roll 4a
, 4c and the web support roll 2a can be moved without disrupting their mutual positional relationship, making it possible to simplify the structure of the one-position moving device.

In other words, since the three types of rolls mentioned above can be moved simultaneously using a single position moving device, it is extremely simple in terms of equipment and maintenance.

FIG. 3 is a schematic front view of the eight-sided roll support device.

The beam blank la includes web support rolls 2a and 2b + flange tip support rolls 4a to 4 as shown in FIG.
d and supported by flange support rolls 10a, 10b. lla to 11j] are the ##l+ bearing fittings of the respective rolls, and the bearing fittings 11a,
llc, lld are transferred to Niframe J3 via pedestal 12, bearing fitting 1], b, lle,
llf is fixed to a lower frame 15 via a pedestal 14. - The upper frame 13 is removably fixed to a fixed frame of the continuous casting apparatus via a support device (not shown), and the upper frame 13 is connected to the case metal fittings 16a,
It is attached to the columns 1'7a, 17b through 16bf so that it can slide up and down, and the lower frame 15 rigidly supports the columns 17a, 17b. 18 is a rotating shaft that is reversely driven by a drive device (not shown), and is connected to the case metal fitting 16 via worm mechanisms 19a and 19b.
a, 16b and the upper frame 13 are raised and lowered. 2
0a and 20b are the capitals of the pillars 17a and 17b.

Now, in the beam blank 1a according to the present invention, one width of the flange is constant even if the type is different, so the web support roll 2b and the flange tip support holes 4b and 4d can remain fixed, and the web Support roll 2a - flange tip support opening=ru 4al 4C is connected to the worm mechanism 19a
, 19b, the position can be changed in one movement. In other words, without constant flange width h-: 1 opening =
- The guide system is very simple, has fewer failures in terms of equipment, and is easy to maintain.

FIG. 4 shows a 4
Since the beano blank 1a is at an advanced stage of solidification in the surface roll support device, the flange tip support roll is not reliable. When this method is changed, the worm mechanism is activated and only the web support roll 231, which is fixed to the upper frame 13 via the bearing fitting 11a, is All you have to do is change the position.

As explained in detail below, in continuous casting of beam blanks, one side width of the flange is fixed to a certain value, that is, a specific fixation that can be selected as appropriate depending on the type of beam blank to be manufactured by the continuous casting equipment. If the value is 1", the equipment can be simplified to 1", making it possible to manufacture beam blanks extremely economically.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of slab support rolls for beam blank casting, and Fig. 2 is a conceptual explanatory diagram explaining the relationship between -J゛ method changes of beam blanks and the 1d change history of support rolls. , FIG. 3, and FIG. 4 are schematic front views of an eight-sided roll support device and a four-sided roll support device according to the present invention. 1, la, lb; beam blanks 2a, 2b;
Web support rolls 3a, 3b; flange support rolls 4a, 4b, 4c, 4d; 7 lange tip support rolls 5a to 5h; position moving device 6; center line 7a; web surface 8a; flange tip 9a; flange single width 10a, 10b ;Flange support roll 11a-11
h;Bearing bracket ■3;Upper frame 15;'I□Frame HJa, 19+);Worm mechanism-3rd flight 2nd 9n Fig. 3

Claims (1)

[Claims] When producing multiple types of beam blanks in rapid succession using a single continuous casting device, the flange single width of all types of beam blanks is constant ((determine the size as li) and cast as !lj). Continuous casting method for high to medium ranks.