JP2002052458A - Cold roll forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently provide formed products having no problem on the surface quality, if formed using a steel strip (a slit coil) affected by rust due to long-time storage. SOLUTION: A continuous steel strip polishing device 7 is installed at a position where the steel strip 10 is in a flat condition before entering a forming stand for polishing the steel strip 10 at, for example, its lower face. The continuous steel strip polishing device 7 has a rolled brush 12 to be rotationally driven in contact with the lower face of the steel strip 10 and two front and rear backup rolls 13 to be loosely rotated in contact with the upper face. The two front and rear backup rolls 13 applies pressure to the steel strip 10 along the outer periphery of the rolled brush 12. The rolled brush 12 has contact with the steel strip 10 being fed at a stable and uniform contact pressure for polishing the steel strip 10 at its surface while removing rust or the like. The surface quality of the steel strip 10 is efficiently improved and the coating quality of a product, if coated, is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold roll forming machine for a steel strip, and more particularly, to a method for efficiently forming a molded product having no problem in surface quality even when a steel strip having a deteriorated surface quality due to rust or the like is used as a material. The present invention relates to a cold roll forming machine which can be obtained in a desired manner.

[0002]

2. Description of the Related Art When a lightweight rolled steel or ERW pipe is manufactured by a cold roll forming machine, a raw material coil such as a hot rolled steel strip, a cold rolled steel strip, or a galvanized steel strip is packed. Unwind,
After slitting the raw material coil to a predetermined width, the slit coil (slit steel strip) is stored in a coil storage place until the time of molding. However, when the package is unpacked, rust easily occurs. In many cases, the storage period from the time of molding to the time of molding is long, so that a slit coil having deteriorated surface quality is used, and the level of product quality is sometimes reduced.

[0003]

Conventionally, with respect to the deterioration of the surface quality of the slit coil which has been stored for a long period of time, the molded product is checked using the slit coil as it is, and the molded product is checked, and the rusted portion is removed with a wire. Although removal was performed manually with a brush or the like, the removal of the rust was complicated, time-consuming, and costly. Further, when the rust has progressed remarkably, there have been cases where the rust cannot be used as a material for molding.

[0004] The present invention has been made in view of the above circumstances, and even if a slit coil having a deteriorated surface quality due to rust or the like is used as a material for long-term storage, a molded product having no problem in the surface quality can be efficiently produced. Another object of the present invention is to provide a cold roll forming machine which can be obtained without increasing the cost.

[0005]

According to the present invention, there is provided a cold roll forming machine for contacting one side of a steel strip between an uncoiler and a forming stand in the steel strip cold roll forming machine. The continuous strip polishing device includes a roll-type brush that is driven to rotate in a rotating manner, and two backup rolls before and after the roll-type brush that contact the opposite surface of the steel strip at a position facing the roll-type brush.

According to a second aspect of the present invention, in the cold roll forming machine of the first aspect, the roll-type brush is formed by laminating a plurality of thin and thin roll-type brushes and pressing them from both sides with pressing plates. It is characterized by.

According to a third aspect of the present invention, in the cold roll forming machine of the first aspect, a backup roll pressing mechanism for pressing the backup roll toward the steel strip is provided.

[0008]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. FIG. 4 shows an upstream portion of a cold roll forming machine according to an embodiment of the present invention. This example is a cold roll forming machine as a steel pipe manufacturing facility. That is, in FIG. 4, 1 is an uncoiler, 2 is a pinch roll, 3 is a leveler, 4 is a shear, 5 is an endwelda,
6 is an accumulator, 7 is a steel strip continuous polishing apparatus of the present invention, and 8 is a forming stand. Reference numeral 10 denotes a material, which is a steel strip (slit coil) obtained by slitting a raw material coil to a predetermined width. The illustrated forming stand 8 is a portion of a breakdown roll of the tube forming machine main body, and forms both ends of the steel strip in a downwardly convex arc shape. Although not shown, a fin pass roll, a squeeze roll, a high frequency welding machine, a cooling zone, a sizing roll, a running cutting machine, a take-out table, and the like are provided downstream of the breakdown roll (forming stand 8). .

The steel strip continuous polishing apparatus 7 is installed immediately before the forming stand 8 in the illustrated example, but is in a flat state between the uncoiler 1 and the forming stand 8, that is, before the forming of the steel strip 10 is started. It is installed at the position. As shown in detail in FIGS. 1 and 2, the steel strip continuous polishing device 7 includes a frame 11, a roll-shaped brush 12 that is driven to rotate in contact with the lower surface of the steel strip 10, and a roll-shaped brush 12. It has two backup rolls 13 before and after contacting the upper surface of the steel strip 10 at opposing positions.

As shown in FIG. 3, for example, the roll-type brush 12 is formed by superposing a plurality of small-width roll-type brushes 15 each having a small width and having a large number of wires 15b radially implanted on the outer periphery of a disk portion 15a. Holding plate 1 from both sides
6 and is fixed together with a spacer 19 to a brush drive shaft 18 supported by a bearing 17. As the wire 15b, for example, a copper wire or a steel wire having a wire diameter of about 0.15 to 0.3 mm is preferably used. The size of the roll brush 12 is, for example, 250 mm in outer diameter,
The diameter of the disk part 15a is 150 mmφ, and the thickness (width)
25 mm or the like. As described above, since the roll-type brush 12 is divided into a plurality of thin roll-type brushes 15, by increasing or decreasing the number of the thin roll-type brushes 15,
The width of the roll-type brush 12 can be adjusted, and the width of the steel strip 10 can be easily adjusted. The brush drive shaft 18 is
The drive brush 21 is connected via a coupling 22 to rotate the brush 12 in the counterclockwise direction in FIG. 1 (ie, the direction opposite to the moving direction of the steel strip 10). Therefore, a large relative speed is obtained for the contact between the roll-type brush 12 and the steel strip 10. The rotation speed of the roll-type brush 12 may be appropriately set in consideration of the line speed (feed speed of the steel strip 10) and other various conditions, and by experiments. The rotation direction of the roll-type brush 12 is preferably opposite to the feed direction of the steel strip 10, but is not excluded, but is not excluded. 1 and 2, illustration of the holding plate 16 and the like is omitted.

The shafts 13a of the front and rear two backup rolls 13 are rotatably mounted on a support plate 24 mounted on an elevating frame 23, and the elevating frame 23 has a slide portion 23a at the base end thereof on a guide rail on the frame 11 side. Guided by 25, it can be moved up and down. Also, frame 1
1, an elevating cylinder 26 for elevating the elevating frame 23
Is provided, and the piston rod 2 of the lift cylinder 26 is
The tip of 6 a is connected to the lifting frame 23. Further, a pressure adjusting screw 28 screwed to a nut 27 fixed to the upper end surface of the frame 11 is provided. The pressure adjusting screw 28 regulates the upper limit of the lifting frame 23 and pressurizes the backup roll 13. To adjust. The lifting frame 23, the support plate 2
4. The guide rail 25, the lifting cylinder 26, the pressure adjusting screw 28, and the like constitute a backup roll pressing mechanism 29 for pressing the backup roll 13 toward the steel strip 10. The portion of the support plate 24 is located on the upstream side (FIG. 1).
Is provided so as to be able to swing up and down about the shaft 13a of the backup roll 13 on the left side, and the distal end side (right side in FIG. 1) of the support plate 24 is pushed down by the piston rod 26a of the elevating cylinder 26. A configuration for applying a pressing force may be employed. With this swinging method, the adjustment of the pressing force is further facilitated. Although not shown, it is preferable to install a dust collector close to the roll-shaped brush 12 and facing the suction port so that the polishing debris by the roll-shaped brush 12 is not scattered.

In the above-mentioned steel pipe manufacturing equipment, the steel strip 10 fed from the uncoiler 1 is rolled by the roll-shaped brush 12 of the steel strip continuous polishing device 7 installed at a flat plate position before entering the forming stand 8. The lower surface is continuously polished. In this steel strip continuous polishing apparatus 7, the front and rear two backup rolls 13 maintain the contact pressure of the roll-shaped brush 12 against the steel strip 10 at an appropriate constant pressure, thereby enabling the surface to be uniformly polished. That is, the steel strip 10 is not directly polished and sandwiched between one backup roll and a roll-shaped brush whose axis is on a vertical line.
Since the steel strip 10 is curved and pressurized along the outer periphery of the roll-shaped brush 12 with the two backup rolls 13, the contact area of the roll-shaped brush 12 with the steel strip 10 can be increased, and the pressing force can be controlled. Easy. Therefore, a uniform and stable pressing force can be maintained, and uniform and appropriate surface polishing can be performed. In addition, the pressing force by the backup roll 13 is
Adjust appropriately according to the degree of surface rust, etc.
Adjust appropriately, taking into account the line speed that usually varies depending on the product size. In addition, since the roll type brush 12 restrains the wire 15b from both sides by the pressing plate 16, the wire 15b is prevented from escaping (deflecting) to the side by the pressing force. And maintain a sufficient abrasive power.

The steel strip 10 whose lower surface has been polished by the steel strip continuous polishing device 7 is formed into a downwardly convex shape by a tube forming machine (equipment below the forming stand 8), and then formed into a circular shape and welded. It becomes a pipe. Therefore, the outer peripheral surface of the product (pipe), that is, the appearance portion is polished, and the product quality is improved. For example, in the case of a coated steel pipe, coating is usually applied only to the outer peripheral surface in a process after forming into a pipe. Therefore, if the surface quality of the outer peripheral surface is improved, the coating quality is improved and a good product is obtained. In this case, the polishing of the surface of the steel strip 10 by the roll-type brush 12 not only removes rust but also gives the surface of the steel strip 10 an appropriate roughness to improve the adhesion of the paint. Thus, the coating quality can be improved in this respect as well. When a galvanized steel strip is used as the material (steel strip 10), white rust on the outer peripheral surface of the product (pipe) can be removed, and a good product can be obtained.

The above-mentioned roll-type brush 12 is a wire brush (a brush made of a metal wire) and is suitable for polishing the surface of the steel strip 10, but is not limited to the wire brush, and may be a roll-type brush using a plastic wire as the wire. A brush can also be used. For example, a synthetic resin wire rod coated with fine abrasive grains, or a synthetic resin wire rod carbonized at the tip and coated with abrasive grains, etc., can be used.

Although the above embodiment is applied to a steel pipe manufacturing facility, it is naturally applicable to a cold roll forming machine for forming a lightweight section steel or the like. In this case, if both sides of the steel strip 10 need to be polished, the steel strip continuous polishing apparatus 7 in FIG. 1 may be turned upside down, that is, an apparatus for polishing the upper surface of the steel strip 10 may be separately arranged. As described above, the polishing using the roll-type brush 12 is preferably dry polishing without using a polishing liquid in terms of easiness of processing of polishing dust, but it is also possible to perform polishing while supplying a polishing liquid. Further, in the embodiment, the backup roll 13 is moved with respect to the roll brush 12 having a fixed position to obtain the pressing force. It is also conceivable to get Further, the roll-type brush 12 is suitably of a divided type in which a plurality of thin roll-type brushes 15 are stacked as in the embodiment, but may be an integral roll-type brush. The posture of the steel strip 10 at the time of polishing is generally horizontal as in the embodiment, but a steel strip having a vertical posture may be polished. In the present invention, two backup rolls are provided before and after, but this does not exclude the provision of extra backup rolls.

[0016]

According to the present invention, between the uncoiler and the forming stand in a steel strip cold roll forming machine, a large number of metal wires or synthetic resin wires in a radial arrangement contacting one side of the steel strip. Since the steel strip continuous polishing device including the roll type brush and the two backup rolls before and after the roll type brush is provided at the position facing the roll type brush, the following effects can be obtained. Even if a slit coil (steel strip) with deteriorated surface quality such as rust is used as a material for long-term storage, rust etc. is removed by the steel strip continuous polishing device to obtain a molded product with no problem in surface quality. Can be. The polishing process at that time is performed between the uncoiler and the forming stand, that is, when the steel strip is in a flat state, so that the polishing is easily and efficiently performed,
The polishing device also has a simple structure. Since the surface polishing is performed on the running steel strip, the polishing operation is extremely efficient, and the surface quality can be improved efficiently. Since the pressing force is applied using the two backup rolls before and after the position opposite to the roll-type brush, the pressing force of the roll-type brush can be uniformly and accurately controlled, and the polishing is unnecessarily polished excessively or insufficiently. Does not occur, and good surface quality can be obtained. Even if it can not be used as a molding material in the past, it can be used as a material by improving the surface quality,
Material loss can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a steel strip continuous polishing apparatus installed in a cold roll forming machine according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view of a portion of a roll-type brush in FIG.

FIG. 4 is a schematic side view of a main part of a cold roll forming machine (in the illustrated example, a steel pipe manufacturing facility) provided with the steel strip continuous polishing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Uncoiler 7 Continuous steel strip polishing device 8 Forming stand 10 Steel strip 11 Frame 12 Roll type brush 13 Backup roll 13a Shaft 15 Thin roll type brush 15a Disk part 15b Wire 16 Holding plate 17 Bearing 18 Brush drive shaft 21 Drive motor 23 Elevating Frame 23a Slide portion 24 Support plate 25 Guide rail 26 Elevating cylinder 26a Piston rod 28 Pressure adjusting screw

Continued on the front page F term (reference) 3C058 AA06 AA09 AA12 AB03 AB06 BA05 CA02 CB03 CB05 3C063 AA07 AB03 BA17 BG07 EE28 FF08 4E063 AA01 BB05 GA20 MA02 MA07

Claims (3)

[Claims] 1. A roll-shaped brush which is driven to rotate in contact with one side of a steel strip between an uncoiler and a forming stand in a steel strip cold roll forming machine, and at a position opposed to the roll-shaped brush. A cold roll forming machine comprising a steel strip continuous polishing device having two backup rolls before and after contacting the opposite surface of the steel strip. 2. The roll type brush according to claim 1, wherein a plurality of thin and thin roll type brushes are superimposed and pressed and fixed by pressing plates from both sides.
The cold roll forming machine as described. 3. The cold roll forming machine according to claim 1, further comprising a backup roll pressing mechanism for pressing the backup roll toward a steel strip.