JP2002035847A - Roll forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll forming device that forms a square column for building from a lengthy steel sheet by means of roll forming process. SOLUTION: A pipe-shaped section A that is formed from a lengthy steel sheet at a preceding process is fed between a lower roller 1 and an upper roller 2, a mandrel 3 that arranges a caulking roller 4 and feeding rollers 51, 51 in front-and-rear of the caulking roller 4 is put into the pipe-shaped section A, and a lapped part A3 of both edges of the lengthy steel sheet that constitutes the pipe-shaped section A is caulked with the caulking roller 4 and the upper roller 2 to join both edges. The pipe-shaped section is fed by the front-and-rear feeding rollers 51, 51 and the lower roller 1, and a corner part roller 8 that corrects the corner of the pipe-shaped section A to a preset value form its inside is mounted in the mandrel 3.

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 for forming a long metal plate into a prism for building by roll forming.

[0002]

2. Description of the Related Art A roll forming apparatus for forming a long metal plate into a building prism by roll forming is disclosed in Japanese Patent Laid-Open No. 50-6136.
No. 5, JP-A-54-112776, and the like.

[0003] However, none of the prior arts has a configuration capable of correcting the corner of a cylindrical body to be a building prism after roll forming, to an intended set angle. Therefore, the angle of the completed building prism was often not a right angle. It is also conceivable to provide the mandrel with a corner correcting die for correcting the corner of the cylindrical body from the inside to a desired set value. However, there is a problem that the mold is worn out due to friction with the cylindrical body and cannot be used for a long time.

[0004] The present invention has been made to solve such problems of the prior art.

[0005]

First, a cylindrical body is gradually formed from a long metal plate in a previous step, and the cylindrical body in this state has a slightly sweet corner. That is, it is not formed at the desired set corner.

Accordingly, the present invention provides a mandrel provided with a caulking roller provided with a corner correcting roller, and in the caulking step, the corner of the cylindrical body can be corrected from inside to a desired set corner. Accordingly, the problems of the prior art have been solved.

[0007]

In order to achieve the above object, the roll forming apparatus according to the present invention has two edges of a long metal plate constituting a cylindrical body formed from a long metal plate in a previous step. Are adjacent to each other, one edge is bent in a U-shape inward and the other edge is bent in a U-shape outward, and these U-shaped bent edges are entangled. Attach and polymerize, attach this polymerized part to a mandrel placed inside the cylindrical body, caulk with a caulking roller and send the cylindrical body to form a prism for building, but this mandrel has a caulking roller and a feed roller respectively. Arranged independently and freely rotatable, caulking the overlapping portion with the caulking roller and the upper and lower rollers and joining both edges, and forming the cylinder with the feed roller and the upper and lower rollers. Send this cylinder across the long metal plate that constitutes it Uninashi, further to the mandrel is provided with a corner for correction roller for correcting the angular portion of the cylindrical body to the desired setting from the inside.

The operation of this means for solving the problems is as follows.

[0009] A mandrel provided with a caulking roller is placed inside the cylinder, and the overlapped portion is caulked while feeding the cylinder to form a prism for construction. In this caulking step, the corners of the cylinder are simultaneously corrected to the desired set values from the inside.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a pre-process, a cylindrical body A is gradually formed from a long metal plate. When the cylindrical body A is formed in this manner, both ends of the long metal plate constituting the cylindrical body A are close to each other. One edge A1 is bent in a U-shape inward, and the other edge A2 is bent in a U-shape outward, and these U-shaped bent edges A1, A2 are entangled. By polymerizing and caulking the polymerized portion A3, a prism is formed.

The roll forming apparatus according to the present invention relates to a technique for correcting a corner of a cylindrical body A having a slightly sweetened corner only by roll forming, to an intended set angle.

A cylindrical body A formed from a long metal plate is sent between lower rollers 1 and 1 and an upper roller 2. One upper roller 2 is provided, but two lower rollers are provided. The two lower rollers 1 and 1 are arranged below the upper roller 2 with a space therebetween in the feeding direction of the cylindrical body A. Contrary to this embodiment, the arrangement of the rollers is such that two upper rollers are provided and one lower roller is provided.
It may be an individual. Further, a roller may be further provided below the upper roller 2. In this way, the cylinder A can be securely caulked without bending.

When the cylindrical body A is passed between the lower rollers 1, 1 and the upper roller 2, the overlapping portion A3 formed by entanglement of the U-shaped bent edges A1, A2 is swaged.

A mandrel 3 is placed inside the cylinder A as shown in FIG. The mandrel 3 has a gear-shaped caulking roller 4 and feed rollers 51 before and after the caulking roller 4.
51 are independently and freely rotatable. The overlapping portion A3 of the cylindrical body A is caulked by the caulking roller 4 and the upper roller 2 to join both edges A1 and A2 of the cylindrical body A.
When the overlapping portion A3 is swaged by the swaging roller 4 in this way, the feed rollers 51, 51
Can be fed while the horizontal state of the cylindrical body A is stabilized.

The attachment of each roller to the mandrel 3 is performed using a shaft. Recess 31 in place of mandrel
The caulking roller 4 and the feed rollers 51, 51 are fitted into the recess 31, and the caulking roller 4 is
The feed rollers 51, 51 are rotatably mounted on the mandrel 3 on the shaft 7, respectively. Part of the peripheral surface of each roller protrudes from the upper and lower surfaces 32 of the mandrel 3. The shaft 6 of the caulking roller 4 and the shafts 7, 7 of the feed rollers 51, 51 are respectively disposed at the vertices of an isosceles triangle when viewed from the side. In other words, the shaft 6 is mounted slightly above the mandrel 3 in the height direction, and the shafts 7 and 7 are similarly mounted slightly below the mandrel 3 in the height direction. A connecting rod 33 is provided on the mandrel 3, and the connecting roller 33 allows the lower rollers 1, 1.
The mandrel 3 is cantilevered at a predetermined position between the mandrel 3 and the upper roller 2. Of course, if the arrangement of the lower rollers 1 and 1 and the upper roller 2 is upside down as described above, the mandrel 3 may be used upside down. The caulking roller 4 and the feed rollers 51, 51 are both arranged at the center of each shaft 6, 7. The caulking roller 4 is provided in a wide width so as to be able to cope with the overlapping portion A3 at the center of the cylindrical body A in the width direction.

The mandrel 3 is provided with a corner correcting roller 8 at any position before and after the caulking roller 4. The corner correcting roller 8 is configured so that the corner of the cylindrical body A can be corrected to a desired set value from the inside of the cylindrical body A. When the cylindrical body A is a quadrangular prism, four corresponding corner correction rollers 8 are provided so that the four corners can be particularly corrected to the desired set values. A roller projection 81 is provided on the corner correction roller 8. Of course, the corner correcting roller 8 is detachable from the mandrel 3 by using a fixing means such as a screw or a shaft.

[0017]

Since the mandrel is provided with a corner correcting roller for correcting the corner of the cylindrical body from the inside, the corner of the completed building prism can be set as the desired set value. In addition, when the cylinder is being fed, it can be caulked almost simultaneously with the caulking, so that the corner can be easily and quickly corrected.

Since the rollers are used for correcting the corners, the wear due to abrasion is less than that of the fixed-type corner-repairing dies, and there is no shavings on the cylindrical body or peeling of the plating. Can withstand enough driving.

Since the corners are set to the desired set values, a high-quality building prism can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a main part of a roll forming apparatus of the present invention.

FIG. 2 is a plan view of a mandrel.

FIG. 3 is a sectional view of a main part of the mandrel.

FIG. 4 is a longitudinal sectional view of a mandrel placed inside a tubular body, showing a corner correcting roller.

FIG. 5 is a longitudinal cross-sectional view of a mandrel placed inside a cylindrical body, showing a caulking roller portion.

FIG. 6 shows a feed roller portion in a longitudinal sectional view of a mandrel placed inside a cylindrical body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower roller 2 Upper roller 3 Mandrel 4 Caulking roller 51 Feed roller 8 Corner correction roller 81 Roller protrusion A Cylindrical body A1, A2 Edge A3 Overlapping part

Claims (1)

[Claims] 1. An apparatus for manufacturing a building prism by sending a cylindrical body formed from a long metal plate in a previous step between upper and lower rollers, wherein the long metal forming the cylindrical body is provided. Both edges of the plate are close to each other, one edge is bent in a U-shape inward and the other edge is bent in a U-shape outward, these U-shaped folds. The bent edge is entangled and polymerized, and this polymerized part is attached to a mandrel placed inside the cylinder and caulked with a caulking roller to send the cylinder and form a prism for construction, but this mandrel has a caulking roller and A feed roller is independently rotatably disposed, and the overlapped portion is caulked by the caulking roller and the upper and lower rollers to join both edges, and the feed roller and the upper and lower rollers described above. This cylinder is transported across a long metal plate that constitutes the cylinder with The roll forming apparatus further comprising a corner correcting roller for correcting the corner of the cylindrical body from the inside to a desired set value.