JPS6072687A - Production of square shape steel - Google Patents

Abstract

PURPOSE:To reduce a square shape steel with good working efficiency by forming channel steels of which both flange parts are opened to the outside, disposing such channel steels to face each other and welding the joint parts while shaping continuously the channel steels with rollers. CONSTITUTION:Channel steels 2 formed by a finishing mill are formed to the wide angle at which the flange parts 3 thereof are opened toward the outside. The channel steels held to face each other from the right and left are passed between upper and lower press rollers 7 to make the flange parts 3 approximately perpendicular to web parts 4. The channel steels 2, 2 are further guided to the inside by guide rollers 11, 11... from the outside and the space between the steels 2 and 2 is assured by projecting lines 8 which are narrowed successively. When the steels 2, 2 arrive at a high-frequency resistance welding machine, high frequency current is passed to upper and lower electrode rollers 14, 14... and the top ends of the upper and lower flange parts 3, 3... are heated and are powerfully pressed, by which the flange parts are successively welded.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing square steel.

As is well known, when manufacturing the rectangular steel that is often used in buildings these days, it is usually produced by joining two U-shaped channel steel and welding the flange ends of each. Conventional forming methods such as hot rolling and cold bending of a thick plate with rolls are known, but the channel steel formed in these finishing forming processes has both flanges co-shaped. Because it is formed parallel to the shape, sliding contact occurs between the flange surface and the roll surface, which tends to cause W4 roughness on the flange surface, and has the disadvantage of severe roll wear. When joining together, if they are butted and pressed from the left and right, they will deform inward and the height of the flange end will be different, and it is not possible to correct the difference in the butt dimension, which causes a problem that a step will occur at the flange joint. However, because of these factors, conventional butt welding of the upper and lower flanges had to be performed separately using arc welding.

The present invention solves such problems, reduces the sliding contact between the flange surface and the roll surface, reduces the roll consumption rate, and eliminates the butt level difference at the end of the flange part, thereby creating a high-frequency resistor that can simultaneously handle the upper and lower parts with good work efficiency. This invention was invented for the purpose of providing a method for manufacturing square steel sections that can be welded together.

An example of the implementation of the present invention will be described below based on the drawings.
1.1 is a roll of a finishing mill, 2 is a roll L, a channel steel rolled and formed between 1, and left and right flange portions 3.
3 is achieved when the cross section is formed with respect to the web portion 4. When molding is performed, the cross section is formed in a state in which a wide angle θ0 is opened outward from the right angle. In this case, the value of θ is preferably about 1° to 5°. A thick plate may be cold bent and formed with rolls without using a rolling machine.

Next, the channel steel 2.2 obtained in this manner is placed on the left and right sides with the flange ends facing each other and placed on a support roller 5.
5.Movably placed on top. 6.6 is channel steel 2.2
Press rollers installed above and below at the advancing side position (right side in Fig. 7) press the channel steel 2.2, which is advancing from the left and right facing each other, from above and below to form the angle θ as described above.
The 7272 part 3.3 which is open to the outside with 0 is shaped approximately at right angles to the web part 4. 7.7 is a fin roller provided above and below the advancing side position of the groove g142 further than the pressing roller 6, and a protrusion 8.8 having a constant width and a larger diameter than the outer circumferential surface is provided at the center position of the outer circumferential surface of each fin roller 7.
are provided along the outer circumferential surface of each roller, and the channel steel 2.2 is advanced between the upper and lower fin rollers 7.7 facing each other from left and right with the protrusion 8 at the center. 9.9 is a fin roller provided above and below the advancing side position of the channel steel 2 further than the fin roller 7.7.
A protrusion 10.10 with a narrower protrusion width is provided along the outer peripheral surface of the roller, and the channel steel 2.2 is placed between the upper and lower fin rollers 9.9 on the left and right sides around the protrusion 1o. Let's proceed in a more face-to-face situation.

Reference numerals 11, 11, . . . designate guide rollers that rotate in contact with the outer surfaces of the respective web portions 4 of the channel steel 2.2 that advance in the facing state. Reference numeral 12 denotes a high frequency resistance welding machine installed at a position on the advancing side of the channel steel 2 from the fin roller 9, and is used to weld the outer surface of the web portion 4.4 of the channel steel 2, 2 advancing from the left and right facing each other. Channel steel 2 at the contacting left and right positions
．． Pressing roller 13 that strongly presses and presses 2 inward.
13... will be appointed as appropriate officials. 14.14 is a high-frequency resistor provided vertically in a substantially V-shape and inclined left and right, centering on the abutment of the upper and lower flange ends of the channel steel 2.2 that advances to the high-frequency resistance welding machine 12. This is the electrode roller of a welding machine.

Since the present invention has such a configuration, the feature of the present invention is that the flange portion 3 of the channel steel 2 formed by a finishing rolling mill is not formed in a parallel state perpendicular to the web portion A, but the flange portion is formed at an angle θ0 from the right angle to the left and right, respectively. Support rollers 5.5 are used to move the structural steel 2.2 formed into this wide angle from the left and right with the tips of the flange portions 3 facing each other. Then, with the channel steels 2.2 facing each other from left and right, they are simultaneously passed between the upper and lower pressing rollers 6 and pressed from above and below.

The channel steel 2.2 is simultaneously compressed and deformed from above and below so that the flange portion 3 with an open angle θ0 is approximately perpendicular to the web portion 4 and both flanges 3.3 are approximately parallel, and the protrusion 8 is
, move the deformed channel steel 2.2 to the fin roller 7 and fin roller 9 side having the protrusion IQ, guide the structural steel 2, 2 inward from the outside using the guide roller 11.11, and sequentially The narrowed protrusions 8 and 10 ensure a distance between the moving channel steel 2.2, and when the channel steel 2.2 reaches the high frequency resistance welding machine 12, the upper and lower electrode rollers 14.1
When a high-frequency current is applied to 4... to heat the tips of the upper and lower flange parts 3.3, and then the pressure rollers 13.13 press forcefully from the left and right sides, each flange part 3.3 of the channel steel 2.2 is heated. The tips of the can be welded in sequence.

Moreover, in this case, when the advancing rear end of the channel steel 2.2 passes the protrusion 10, the left and right channel steels 2.2 become unstable by the time they reach the pressure welding row 2-13 due to the pressing force from the left and right sides. Since they are in perfect contact, it is desirable to bend them outward as shown in Figure 7. Therefore, when the present invention is implemented, the channel steel is not at a right angle but at a wide angle when it is formed by a finishing mill, so wear due to slipping of the roll surface occurs.

The collapse has been resolved, and the channel steel 2 facing the pressing roller 6.6, fin roller 7.7, and fin roller 9.9
．． 2 are pressed from above and below at the same time to sequentially deform and mold the angle of the 7272 part, so there is no difference in level at the abutting part of the flange part tip, and there is no fear that it will deform inward even when pressed with a pressure roller for welding. , constantly channel steel 2.2
The butt parts can be reliably and continuously pressure-welded on the same level surface, so it is possible to weld the top and bottom simultaneously using high-frequency resistance welding, which has extremely high work efficiency, without having to weld the top and bottom separately using arc welding. This is an invention with great effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the forming state of the channel steel of the present invention. FIG. 2 is a perspective view showing the channel steel of the present invention. FIG. 3 is a front view showing the shaping state by the press roller. FIGS. 4 and 5 are front views showing the state in which the channel steel is brought together by the fin rollers. FIG. 6 is a front view showing the welding state. FIG. 7 is a layout diagram of the present invention. l・11 Rolls 2 of finishing rolling mill... Channel steel 3. ... Protrusions 9 and 11 Fin rollers 10 Yu... Protrusions 11 ・IIIe guide roller 12 ... High frequency resistance welding machine 13 ... Pressure roller 14 @ ... Electrode roller patent applicant Yamato Kogyo Co., Ltd.

Claims (1)

[Claims] (1) The cross-sectional shape of the channel steel to be formed into a square section steel before welding is formed into a channel steel in which both flanges are open to the outside with respect to the web section, and then the two channel steels are The flange parts are arranged facing each other from the left and right, and are continuously shaped using two pressing rollers at the same time so that each flange part is approximately perpendicular to the web part, and the two flange tip joints are simultaneously high-frequency resistance welded. A method for manufacturing square steel.