JPH0788562A - Forming roll apparatus - Google Patents

Abstract

PURPOSE:To form a light steel sheet pile with high dimension in the height direction, etc., with small diameter rolls and to enlarge the product size range to be used in common. CONSTITUTION:Plural feeding drive exclusive roll stands drive feeding a blank. The former bending roll stand 13 and its down stream side latter bending roll stand are arranged respectively between the former part and the latter part of the feeding drive exclusive roll stand groups. The first bending roll stand 13 has upper and lower freely rotating flat rolls 21a, 21b to clamp a web part 1a of a light steel sheet pile and upper and lower freely rotating horizontal V-bending rolls 23a, 23b to clamp a 2nd bending part 1d and bends a half of the final bending angle of a 1st bending part 1b and bends the final bending angle of a 2nd bending part 1d. The latter bending roll stand has upper and lower freely rotating flat rolls, freely inclining rolls and receiving rolls, and bends the 1st bending part 1b until the final bending angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll forming apparatus suitable for forming a lightweight steel sheet pile having a large height.

[0002]

2. Description of the Related Art In the conventional general roll forming method, a roll stand having a pair of upper and lower horizontal hole type rolls forming a hole type through which a material passes is arranged in a multi-stage tandem, and at least one roll stand is provided. By driving one of the upper and lower sides, the material feed drive and bending forming are performed simultaneously. In contrast to the above-mentioned general forming method, the feed driving of the material and the bending forming of the material are separated, and the feed driving is performed by a roll stand dedicated to the feed driving having upper and lower horizontal cylindrical material feeding rolls. As shown in FIG. 12, the molding was performed between the roll stands dedicated to each feed drive,
A method performed by a forming unit 7 having a plurality of idler rolls functioning as a roller die is known as a roller die forming method. This forming unit 7 includes cylindrical rolls 3 and 4 which contact the outer surface near the bent portion 2a on both sides of the bent portion 2a of the material 2 and an acute angled shape which contacts the inside of the bent portion 2a. It is a structure in which a set of three idle rolls together with the roll 5 is attached to the left and right movable face plates 6 which are movable and adjustable in the material width direction (left and right direction in FIG. 12)
Idling rolls 3, 4, 5 that function as roller dies
When the material passes through the gap of No. 5, the material is bent and formed at a predetermined angle (JP-A-51-2668, JP-A-55-55).
106630).

[0003]

By the way, as shown in FIG. 11, as a lightweight steel sheet pile, a flange extending downward through a central web portion 1a and first bent portions 1b at both ends of the web portion 1a. Part 1c and this flange part 1c
There is a light-weight steel sheet pile 1 having a cross-sectional shape having flat portions 1e extending outward in the horizontal direction through the second bent portions 1d at the lower ends of the flat portions 1e and having claws 1f at both ends of the flat portion 1e. This kind of lightweight steel sheet pile is usually the largest size and has a height H
However, in recent years, a large lightweight steel sheet pile having a height dimension of more than 200 mm has been demanded mainly in terms of cross-sectional performance. Conventionally, when forming a normal lightweight steel sheet pile that is not so large in height, the above-mentioned general method using a pair of upper and lower hole type rolls has been adopted. If a general method using rolls is attempted, the roll diameter is inevitably large and the roll weight is large, which is extremely disadvantageous in terms of roll replacement work, cost, and the like. In addition, the product size range that can be combined with the forming method using a hole-type roll is narrow.

Although it is conceivable to adopt the above-mentioned roller die forming method for forming this large-sized lightweight steel sheet pile, the roller die forming method is adopted for such a cross-sectional shape having two bent portions on each of the left and right sides. In such a case, if it is attempted to form two bent portions on each of the left and right sides in parallel, the adjustment of the position of each idler roll 3, 4, 5 becomes complicated and it is not easy to form the shape. It should be noted that such a problem will not occur if the bending portions are sequentially bent and formed one by one on the left and right sides, but this is not preferable because the number of roll stand steps increases.

The present invention has been made in view of the above background, and when forming a lightweight steel sheet pile or the like having a large height,
To provide a roll forming apparatus capable of reducing the roll diameter by reducing the roll diameter, having a wide range of product sizes that can be used in common, easily forming a shape, and not increasing the number of roll stand steps. With the goal.

[0006]

SUMMARY OF THE INVENTION According to the present invention for solving the above-mentioned problems, a central web portion, flange portions extending downward through first bent portions at both ends of the web portion, and a flange portion of the flange portion are provided. In a roll forming apparatus for forming a formed product having a cross-sectional shape having a flat portion extending outward in the horizontal direction through a second bent portion at the lower end, a pair of upper and lower horizontal material feed rolls for reducing only the web portion. Has
A roll stand dedicated to multiple feed drives that drives the material by driving only the upper material feed roll with the lower material feed roll as idle, and a pair of upper and lower horizontal idle rolls that sandwich the web part. Of the flat roll and the roll shaft of the flat roll, which is independent of the roll shaft of the flat roll, forms a V-shaped hole and bends the second bent portion. Bending rolls, which are arranged between the feed drive dedicated roll stands in the first half of the plurality of feed drive dedicated roll stands, and have a bending shape of about half the final bending angle of the first bent portion. A plurality of front half bend forming roll stands that perform bending forming of the final bending angle of the second bent portion in parallel, a pair of upper and lower horizontal flat rolls sandwiching the web portion, and an inclined roll The flange provided on the shaft Of the upper idle roll and the lower flat roll, which are in contact with the outer side of the lower roll, are provided on a roll shaft independent of the roll shaft of the lower flat roll and receive the lower side of the second bent portion. A plurality of roll receiving rolls, which are arranged between the feed drive roll stands in the latter half of the plurality of feed drive roll stands to perform bending forming of the final bending angle of the first bending portion. The second half of the bending forming roll stand, and a pair of upper and lower horizontal hole type rolls that are arranged in the final step after being bent into the almost final cross-sectional shape and form a hole shape of the final cross-sectional shape, at least one of the upper and lower sides And a driven roll stand for shaping.

[0007]

In the above structure, for example, in the case of a lightweight steel sheet pile, the claws at both ends are previously formed by the claw forming roll stand. As a result, a cross-sectional shape with a flat center and claws at both ends is obtained. Subsequently, the material is fed and driven by a plurality of roll stands dedicated to feed driving. Then, in the front half of the plurality of feed drive roll stands, the first bending part and the second bend part are formed by the first half bending roll stand arranged between the feed drive roll stands. . In this process, the second bend is bent to about the final bend angle and the first bend is bent to about half the final bend angle. In this case, the V-bending roll has a second bending portion from a shallow V-shape to a deep V-shape.
The first bent portion is bent while gradually increasing the bending angle into a shape. In the latter half of the group of feed drive-dedicated roll stands, the first bending portion is bent and formed to a final bending angle by the latter half bending roll stands arranged between the feed drive-dedicated roll stands. At this stage, the material has almost the final sectional shape. In this case, the flange portion is pushed down by the inclined roll to deepen the bending angle of the first bent portion. Then, the final shape is determined by passing through the perforated roll of the shape-forming roll stand.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, as shown in FIG. 11, the web portion 1a, the first bent portion 1b, and the flange portion 1 are provided.
c, second bent portion 1d, flat portion 1e, and claw 1f
This is a case where a large-sized lightweight steel sheet pile 1 having a cross-sectional shape having a height dimension H of more than 200 mm is formed.
FIG. 1 is an overall side view showing an embodiment of the roll forming apparatus of the present invention. Reference numeral 11 is a claw forming roll stand, reference numeral 12
Is a roll stand dedicated to feed drive, reference numeral 13 is a first half bending roll stand, reference numeral 14 is a second bending roll stand, and reference numeral 15 is a shape determining roll stand.

The pawl forming roll stand 11 is a roll stand for preliminarily forming pawls 1f on both ends of a flat material, and as shown in FIG.
6a, 16b, and drives at least one of the upper and lower sides. The number of stages of the claw forming roll stand 12 is eight in the illustrated example, and FIG. 2 shows the final stage. It should be noted that the roll hole mold itself in each of the claw forming roll stands 11 has been conventionally used, and the details thereof will be omitted. The roll diameter of each of the rolls 16a and 16b can be reduced, and no special consideration is required. However, it is necessary to adjust the rotational speed of the drive shaft in order to match the peripheral speed with the subsequent rolls. Further, the lightweight steel sheet pile 1 of FIG. 1 usually has a rib at the center of the web portion 1a as a reinforcement by a small groove, and this rib is formed before the pawl 1f, but it is omitted here.

The roll stand 12 dedicated to the feed drive is
In the illustrated example, five stages are provided. As shown in FIG. 3, the feed drive dedicated roll stand 12 is composed of a pair of upper and lower horizontal material feed rolls 17a and 17b for pressing down only the web portion 1a of the lightweight steel sheet pile, and the material feed roll 17b below the horizontal material feed rolls 17b. As the idle roll, and the upper material feed roll 17a
Only driving. In this case, the roll diameter of the upper material feed roll 17a to be driven (roll diameter in the web portion 1a) is set to the pass line diameter (roll diameter on the pass line, and the peripheral speed at that roll diameter is approximately the material feed rate). The roll diameter is set to the speed), and the roll diameter of the lower material feed roll 17b is set as small as possible. This reduces the roll weight. Material feeding roll 17 of this embodiment
The materials a and 17b serve to feed the material and determine the corner of the first bent portion 1b. That is,
The width of the lower material feeding roll 17b is approximately equal to the width of the web portion 1a, but the upper material feeding roll 17b
The width of a has such a width that it also contacts a part of the flange portion 1c.
The material feeding roll 17a on the upper side is the flange portion 1c.
Even if the lower material feeding roll 17b contacts the flange portion 1c, the upper and lower material feeding rolls 17a and 17b roll down only the web portion 1a. However, the upper material feeding roll 17a may be a simple cylindrical flat roll. Also,
The number of stages of the roll stand 12 dedicated to feed drive may be appropriately omitted if the feed drive force of the material is not insufficient. In that case, two front half bending roll stands 13 or two rear half bending roll stands 14 may be arranged in succession.

The first half bending roll stand 13 comprises:
In the illustrated example, three stages are provided. As shown in FIGS. 4 and 5, the first half bending roll stand 13 includes a pair of upper and lower horizontal flat rolls 21 sandwiching the web portion 1a.
a, 21b and the roll shafts 22a, 22b of the flat rolls 21a, 21b are independent roll shafts 24, respectively.
a pair of upper and lower horizontal V-bending rolls 23a and 23b for forming a V-shaped hole to bend and form the second bent portion 1d. The roll stands are arranged between the feed drive roll stands 12 in the front half of the group of feed drive roll stands 12 and are about half the final bending angle (82 ° in the illustrated example) of the first bent portion 1b (that is, 41). Bending) and the second bent portion 1d
And the final bending angle (82 ° in the illustrated example) are simultaneously performed. In this case, the V bending rolls 23a, 23
As for b, as shown in FIG. 8, the first bent portion 1b is bent while gradually increasing the bending angle of the second bent portion 1d from the shallow V shape to the deep V shape. The upper flat roll 21a and the upper V-bending roll 23a are attached to the upper frame 27 via holders 25 and 26, respectively, and the lower flat roll 21b and the V-bending roll 23b are attached via holders 28 and 29, respectively. Attached to the lower frame 30, the upper and lower frames 27, 30
Are connected to each other via a threaded rod 31 and their intervals can be adjusted. Although not described in detail, the V-bending roll 23
A and 23b can be moved and adjusted in the roll width direction (left and right direction in FIG. 4). Further, both the mounting height position of the upper V-bending roll 23a to the upper frame 27 and the mounting height position of the lower flat roll 21b to the lower frame 30 can be changed. Since the height position or the roll width direction position of each roll can be adjusted and changed in this way, each roll of the first half bending roll stand 13 can easily cope with a product size change. Note that this structure in which the upper and lower frames 27, 30 are connected by a screw rod 31 so that the distance between them can be adjusted is shown as a model, and various other structures can be adopted as the frame structure for holding each roll. it can.

The latter half bending roll stand 14 comprises:
In the illustrated example, three stages are provided. The latter half bending roll stand 14 is provided with a web portion 1 as shown in FIGS.
A pair of upper and lower horizontal flat rolls 35 sandwiching a
a, 35b, and an idle tilt roll 37a provided on the tilted roll shaft 38a and in contact with the outer surface of the flange portion 1c.
And the roll shaft 3 of the lower flat roll 35b.
A horizontal idle receiving roll 37b which is provided on a roll shaft 38b independent of 6b and receives the lower surface side of the second bent portion 1d.
And is disposed between the feed drive dedicated roll stands 12 in the latter half of the group of feed drive dedicated roll stands 12 to bend and form the final bending angle of the first bending portion 1b (in the illustrated example, approximately 41 mm). Bending from 0 ° to 82 °). The inclined roll 37a includes a first bent portion side portion 37'a and a second bent portion side portion 37 "a.
And a roll shaft 38a thereof is supported by a U-shaped holder 40 that sandwiches the first bent portion side portion 37'a and the second bent portion side portion 37 ". a is a shaft support base portion 40a below the holder 40 of the roll shaft 38a.
It is supported by a cantilever portion extending downward. With this configuration, the inclined roll 37a can be stably supported, and at the same time, it is possible to avoid the claw 1f and hit the second bent portion 1d, so that the second bent portion 1d can be reliably molded. It will be possible. In addition, when the product size is changed, the portion 37 "a on the second bending portion side of the inclined roll 37a.
Since only the one with a predetermined width needs to be replaced, the product size can be easily changed. The upper flat roll 35a and the inclined roll 37a are respectively attached to the holder 3
The lower flat roll 35b and the receiving roll 37b are attached to the upper frame 41 via 9, 40.
Is the lower frame 44 via the holders 42 and 43, respectively.
The upper and lower frames 41, 44 are connected to each other via a screw rod 45, and their intervals can be adjusted.
Although not described in detail, the tilt roll 37a and the receiving roll 37b can be moved and adjusted in the roll width direction (left and right direction in FIG. 6). Further, the sloping roll 37a which is divided into two parts can be replaced with one having a different width depending on the length of the flange part 1c. Also,
The mounting height position of the lower flat roll 35b to the lower frame 44 can be changed. In this way, the height position of each roll or the position in the width direction of the roll can be adjusted / changed, or some rolls can be replaced. Can be made. In the latter half bending roll stand 14, since the angle of the second bent portion 1d has already been bent and formed to the final shape, it does not change, and as shown in FIG. 9, only the first bent portion 1b is the final bent portion. It is bent and formed from half the normal bending angle to the final bending angle. Note that the receiving roll 37b may be omitted for some of the plurality of latter half bending roll stands 14.

The shape determining roll stand 15 is a dedicated roll similar to the conventional one, but as shown in FIG. 10, a pair of upper and lower hole rolls 50 forming a hole having a final sectional shape.
a, 50b, at least one of the upper and lower sides is driven,
It is arranged in the latter stage of the latter half bending roll stand 14. The pass line diameters of the hole-shaped rolls 50a and 50b are set to the intermediate height position of the flange portion 1c (the pass line is indicated by a one-dot chain line PL). The shape-determining roll stand 15 shapes the shape of the product, and further corrects warpage and bending as necessary.

The forming process in the roll forming apparatus having the above structure will be described. First, the claw forming roll stand 1
The claws 1f at both ends are previously formed by the upper and lower hole-shaped rolls 16a and 16b. As a result, as shown in FIG. 2, a cross-sectional shape having a flat center and claws 1f at both ends is obtained. The material is continuously driven by a plurality of roll stands 12 dedicated to feed drive.
In the first half of the second group, the first half bending roll stand 13
Thus, as shown in FIG. 8, the first bent portion 1b and the second bent portion 1b
The bending portion 1d is molded. In this process, the web portion 1a is constrained by the upper and lower flat rolls 21a and 21b, and the upper and lower V bending rolls 23a and 23b cause the second bending portion 1d to have a substantially final bending angle (about 82 ° in the illustrated example). ), The first bent portion 1b is bent to about half the final bending angle (about 41 ° in the illustrated example). In the latter half of the group of feed drive-dedicated roll stands 12, by the latter half bending roll stand 14, the first bending portion 1b is bent to a final bending angle (about 82 ° in the illustrated example) as shown in FIG. To be done. In this process, the web portion 1a has upper and lower flat rolls 35.
The bending angle of the first bent portion 1b is gradually deepened by the inclined roll 37a and the receiving roll 37b. At this stage, the material has almost the final sectional shape. Then, by passing through the upper and lower hole-shaped rolls 50a and 50b of the shape determining roll stand 15, final shape determination and, if necessary, correction of warpage and bending are performed.

Each roll stand 11, 12, 1
The number of stages 3, 14, and 15 is one example in the illustrated example, and may be increased or decreased as necessary. Further, in the embodiment, the case of forming the lightweight steel sheet pile 1 having the claws 1f at both ends has been described, but the present invention is not limited to the lightweight steel sheet pile, and can be applied to forming a cross-sectional shape having no claws at both ends.

[0016]

According to the present invention, in the region where the forming of the first bent portion and the second bent portion is performed concurrently (that is, the area of the first half bending roll stand), a pair of upper and lower horizontal portions is provided. Idling flat rolls and a pair of upper and lower horizontal V-bending rolls with independent roll axes,
In the area where only the second bent portion is formed after the first bent portion is finished (that is, the second half bending roll stand area), a pair of upper and lower horizontal flat rolls,
Since the upper and lower inclined rolls are inclined and the lower horizontal idler roll is used, the roll diameter can be significantly increased even when molding a cross-section with a large height. It was possible to make it smaller, and the weight of the roll could be greatly reduced.

Further, by adjusting the position of each idler roll, it is possible to deal with various product sizes, so that the product size range that can be combined is sufficiently wide. Also, the second
Since the first bent portion is also formed at the same time when the bent portion is formed, the number of roll stand stages is not unnecessarily increased. Also, in the process (bending roll forming roll stand area) in which the bending and forming of the two bent portions are performed in parallel, the forming is performed by the idle roll provided on the horizontal roll shaft. Compared with the roller die forming method that uses inclined rolls, etc., the adjustment is easier and the shape of the product is easier. In addition, the idle rolls in the first half bending roll stand and the second half bending roll stand are easy to transport because they are easy to be made into a cassette and lightweight, and the roll replacement work due to the product size change is easy, and the roll replacement time is shortened. To be done.

According to the third aspect, the portion on the first bending portion side of the two-divided inclined rolls is supported by the double-supported shaft (the both-supported portions of the roll shaft), and the second bending portion side is supported. Since the part is supported by the cantilever shaft (the cantilever part of the roll shaft), the inclined roll can be supported stably, and at the same time, the claw of the lightweight steel sheet pile is avoided and the second bent portion is struck. Therefore, the second bent portion can be reliably molded. Further, when the product size is changed, only the portion on the second bent portion side needs to be exchanged with the one having a predetermined width, so that the product size can be easily changed.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of a roll forming apparatus of the present invention.

FIG. 2 is a front view of a main part of a claw forming roll stand in the roll forming apparatus of the present invention.

FIG. 3 is a front view of a main part of a roll stand dedicated to feed drive in the roll forming apparatus of the present invention.

FIG. 4 is a front view of a main part of a front half bending roll stand in the roll forming apparatus of the present invention.

5 is a right side view of a main part in FIG. 4. FIG.

FIG. 6 is a front view of the main part of the second half bending roll stand in the roll forming apparatus of the present invention.

FIG. 7 is a right side view of a main part in FIG.

FIG. 8 is a diagram showing a material bending process in the former half bending roll stand.

FIG. 9 is a diagram showing a material bending process in the latter half bending roll stand.

FIG. 10 is a front view of a main part of a shaping roll stand for shaping in the roll forming apparatus of the present invention.

FIG. 11 is a cross-sectional view of a lightweight steel sheet pile, showing an example of a product to be formed by the roll forming apparatus of the present invention.

FIG. 12 is a diagram illustrating a roller die forming method as an example of a conventional roll forming method.

[Explanation of symbols]

 1 Light Steel Sheet Pile 1a Web Part 1b First Bent Part 1c Flange Part 1d Second Bent Part 1e Flat Part 1f Claw 11 Claw Forming Roll Stand 12 Feed-Drive Roll Stand 13 First Half Bending Roll Stand 14 Second Half Bending Forming roll stand 15 Forming roll stand 17a, 17b Material feeding roll 21a, 21b Flat roll 22a, 22b Roll shaft 23a, 23b V-bending roll 24a, 24b Roll shaft 35a, 35b Flat roll 36a, 36b Roll shaft 37a Inclined roll 37'a 1st bending part side part 37 "a 2nd bending part side part 37b receiving roll 38a, 38b roll shaft 50a, 50b hole type roll

Claims (3)

[Claims] 1. A horizontal direction through a central web portion, a flange portion extending downward through first bent portions at both ends of the web portion, and a second bent portion at a lower end of the flange portion. In a roll forming apparatus for forming a formed product having a cross-sectional shape having a flat portion extending to the outside, there is a pair of upper and lower horizontal material feed rolls that roll down only the web portion, and A plurality of dedicated roll stands for feed drive, which drives only the material feed roll on the upper side to drive the material, a pair of horizontal flat rolls that sandwich the web part, and a pair of flat idle rolls. It is provided on a roll shaft independent of the roll shaft,
A pair of upper and lower horizontal V-bending rolls that form a V-shaped hole and bend and form the second bent portion, and feed in the front half of the plurality of roll stand groups dedicated to feed drive. It is arranged between the roll stands for exclusive use of driving, and performs bending forming of about half the final bending angle of the first bending portion and bending forming of the final bending angle of the second bending portion in parallel. A plurality of front half bending roll stands, a pair of upper and lower horizontal flat rolls sandwiching the web portion, an upper idle tilt roll provided on the inclined roll shaft and contacting the outer surface of the flange portion, and The lower flat roll is provided on a roll shaft independent from the roll shaft of the lower flat roll, and includes a lower horizontal idle receiving roll that receives the lower surface side of the second bent portion, and is dedicated to the plurality of feed drives. Feeding in the second half of the roll stand group A plurality of latter half bending roll stands arranged between the dedicated roll stands to perform bending forming of the final bending angle of the first bending portion, and arranged in the final stroke after being bent into an almost final sectional shape And is provided with a pair of upper and lower horizontal hole-shaped rolls that form the hole shape of the final cross section
A roll forming apparatus comprising: a shaping roll stand in which at least one of upper and lower sides is driven. 2. A roll forming apparatus for forming a lightweight steel sheet pile having a cross-sectional shape having claws at both ends of the flat portion, wherein a pair of upper and lower horizontal hole molds are provided in front of the front half bending roll stand group. 2. The roll forming apparatus according to claim 1, further comprising a plurality of claw forming roll stands for forming the claws at both ends in advance by a roll. 3. An inclined roll in the latter half bending roll stand is divided into a first bending portion side portion and a second bending portion side portion, and the roll axis thereof is the first folding portion side portion. It is characterized in that it is supported by a U-shaped holder that sandwiches the portion on the side of the bending portion, and the portion on the side of the second bending portion is supported by a cantilever portion extending below the holder of the roll shaft. The roll forming apparatus according to claim 2.