JPS6124333Y2 - - Google Patents

Description

[Detailed description of the invention] During cold roll forming, a metal strip is passed through multiple roll stands and sequentially bent into a predetermined tube shape. The material is bent into a tube shape before welding by passing through a series of fin pass rolls having a roll structure with protruding ring-shaped fins intervening to support the material.

The present invention relates to the structure of this fin pass roll.

A fin pass roll has a fin roll structure in which the strip is bent into a tube shape in the center, and fins are placed between the ends of the strip to support it, and the strip is bent into a tube shape with fins on both sides of the fins. The format has been conventionally used, and the three methods shown in FIGS. 1 to 3 are the most common.

The system shown in Figure 1 is fin 1 and fin rolls 2 and 3.
This is a system in which the belt rotates as a unit in response to the rotational force of the rotating shaft, and the strip is sent forward.

In this method, both ends of the strip, which has a semi-tubular shape, are tightly pressed to the fins and fin rolls.The fins are in contact with the fin rolls on both sides, and these are given rotational force by a rotating shaft, and the strip becomes semi-tubular. The strip moves forward due to the frictional force that accompanies the rotation of the rolls, but since the circumferential speed of the rolls varies depending on the diameter, there is always a difference in speed from a strip that advances at the same speed in all parts. , slippage will occur.

The parts where the roll is most strongly pressed against the strip are the parts 5 and 6 where they touch both ends of the strip, but if the strip slips while being strongly crimped, the roll will be noticeably damaged at parts 5 and 6 due to large friction. wear out. Due to the irregular progression of this wear and the irregularities of both ends of the strip, an impact force is applied to the roll, resulting in the disadvantage that the rolls near the contact portions 5 and 6 of both ends of the strip easily chip off. In addition, both ends of the strip were distorted due to slippage, resulting in poor welding performance and damage to the surface of the strip.

The structure shown in Fig. 2 was invented with the aim of improving the above-mentioned drawbacks, but in this structure, the fins are rotated independently and freely in order to eliminate slippage between the strip end portions 7 and the fins 8. Although the above-mentioned drawbacks of the band plate both end portions 7 have been solved by this idea, the slippage between the fin roll and the band plate still cannot be solved in the vicinity 11 of the dividing position between the fins and fin rolls 9 and 10, and the above-mentioned drawbacks have been solved. There were still problems that could not be resolved.

The structure shown in FIG. 3 is a structure in which the dividing position of the fin 12 is close to the intermediate position of the hole-shaped curved surfaces of the fin rolls 13 and 14. Since the fin 12 and the fin rolls 13 and 14 are usually fixed with bolts or the like, slippage between the rolls and both ends of the strip cannot be eliminated, resulting in large wear of the rolls, which distorts both ends of the strip and reduces welding performance. Another drawback was that the surface of the strip was damaged.

The present invention provides a fin pass roll that eliminates the drawbacks of the conventional structure described above.

The present invention allows the fin and the fin roll to freely rotate between side disks provided at both ends in the axial direction, thereby creating a fin in which the component force in the roll axis direction of the forming reaction force from the material to be formed is almost balanced. The fin roll rotates as the material to be formed advances, and the fin roll is supported by a side disk that rotates together with the drive shaft to absorb the forming reaction force of the material to be formed in the direction of the roll axis. It is designed to rotate at a speed determined by the speed of the material and the friction distribution. Therefore, friction is reduced in both cases. Furthermore, the fin roll is backed up to the side disk by the molding reaction force, thereby compensating for the decrease in strength and instability caused by narrowing the width and free rotation.

The present invention will be explained in detail below with reference to FIGS. 4 and 5.

In Fig. 4, 15 is a strip plate bent into a semi-tubular shape, 16 is a fin, 17 and 18 are fin rolls, 20 and 21 are side disks, 19 is a sleeve, and 22 is a lower roll. It's a fine pass roll.

The side disks 20, 21 and the sleeve 19 are usually joined together by a tightening device consisting of a group of bolts 23 and nuts 24, and the upper rotating shaft 25
and is fixed by a key 25. The upper rotating shaft is rotated by the rotational force transmitted through the key by a drive device built into the molding machine. Further lower roll 22
Similarly, it is fitted onto the lower rotation shaft 27 and fixed by a key 28. Then, the rotational force is transmitted through the key by the drive device and rotates, and the friction force between the lower roll and the band plate sequentially advances the band plate. At the same time, the fin 16 and the fin roll 1 are fitted to the upper rotating shaft.
7 and 18, it functions to bend and form the strip plate into a tube shape.

On the other hand, the fin rolls 17 and 18 are divided at a position including the hole-shaped outer diameter surface, are located at both left and right ends of the fin 16, and between the side rolls 20 and 21, and are fitted onto the outer peripheral surface of the sleeve 19. has been done. Therefore, the fins and fin rolls are structured so that they can freely rotate at different speeds independently of the sleeve and side rolls, which are integrally fixed to the upper rotating shaft and rotate in response to rotational force.

The parts where the strip and the roll are most strongly crimped are the parts 29 and 30 that contact both ends of the strip, and the fin rolls 17 and 18 have a large difference in diameter between the parts that contact the strip, so even at the same rotation speed, Even if there is a difference in circumferential speed due to the difference in diameter, since the above structure is configured, the side disks 20, 21 and sleeve 1
Since it can rotate at a free speed independent of 9, it can rotate while maintaining balance with minimal slippage with the band plate. Therefore, the wear of the fins 16 and fin rolls 17, 18 is significantly reduced compared to rolls with a conventional structure, and the deterioration of welding performance caused by distortion due to slippage at both ends of the fins and strip is improved, and the wear of the fins and fin rolls is improved. All defects such as damage to the surface of the strip due to slippage are eliminated.

In addition, the side disks 20 and 21 do not come into direct contact with the strip plate, and there is no need to use high-grade steel such as the fins and fin rolls that are in direct contact with the strip plates, which require wear resistance and heat resistance. It is also very beneficial in terms of resource saving as it is possible to replace and use only the unusable part of the roll because it is divided into side rolls.

Next, the embodiment shown in FIG. 5 will be described. The difference in structure from FIG. 4 is that the fins 16 and fin rolls 17, 18 were located on the outer peripheral surface with the sleeve 19 acting as a sliding bearing, whereas in this embodiment, the fins 16, fin rolls 17, 18
The only difference is that is located on the outer circumferential surface of the sleeve 19 via a needle roller bearing 31, and all other structures are the same. Therefore, the functions and effects produced by this embodiment are all the same as those of the embodiment shown in FIG. 4 described above.

As explained above, by configuring the fin roll and the fin sleeve, or the structure in which the fin rotates independently and freely through the sleeve and the bearing, not only damage to the strip surface, but also wear and partial chipping of the fin and fin roll can be avoided. It is highly effective to provide a fin pass roll that prevents welding, has a long life, and stabilizes welding performance. In addition, only the unusable part of the roll can be replaced and used, and high-grade steel can be used only to the minimum necessary extent, thereby contributing to resource conservation.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are sectional views of a conventional fin pass roll, and FIGS. 4 and 5 are sectional views of the fin pass roll of the present invention. 16: Fin, 17, 18: Fin roll, 2
0, 21: Side disk, 19: Sleeve, 2
9: Needle roller bearing.

Claims (1)

[Claims for Utility Model Registration] 1. Consists of a fin attached to a drive shaft used when bending a metal strip into a predetermined tube shape through multiple roll stands, and fin rolls arranged at both ends of the fin. In the split roll, the fin and the fin roll are rotatably mounted between left and right side disks fixed to the drive shaft, and the fin roll is driven by friction with the side disk at its end surface. Finpass roll. 2. Utility model registration claim 1, characterized in that the fins and fin rolls are rotatably supported by a bearing provided on the outer diameter of a sleeve whose inner diameter is fixed to the drive shaft between the side disks.
Fine pass roll as described in section.