JPH0596310A - Method for adjusting roll gap of rolling mill - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Rolling in which one roll 1 is held by an eccentric cartridge 6 and the eccentric cartridge is rotated by a trunnion nut 9 screwed onto a roll gap adjusting screw shaft 15. In the roll gap adjusting method of the machine, the roll can be used until the roll diameter becomes smaller than the minimum axial distance defined by the mechanism. [Structure] A stopper 17 for preventing movement of the trunnion nut 9 is attached to the screw shaft 15 in a positionally adjustable manner,
The position of the stopper is set so that the distance between the roll center axes is in the state where the trunnion nut is in contact with the stopper, and both rolls can approach each other until the trunnion nut contacts the stopper. Secure a distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting roll intervals in a rolling mill, and more particularly to rotating an eccentric cartridge for rotatably supporting a roll by means of a screw shaft and a trunnion nut screwed onto the screw shaft. The present invention relates to a method of adjusting the roll gap by translating the roll in the radial direction.

[0002]

2. Description of the Related Art For example, when rolling a wire rod or a wire material, a sleeve having a hole type (caliber) is fitted to each of a pair of rotating shafts which are connected to each other by meshing gears. The rolling rolls are combined to form a rolling roll, and one rolling shaft is driven to rotate the rolling rolls in mutually opposite directions. The distance between the rolling rolls must be adjusted accurately according to the purpose, and a mechanism using an eccentric cartridge has been conventionally used as an adjusting mechanism for that purpose depending on the type of rolling mill. This is because the eccentric cartridge that rotates around a position eccentric from the axis of the rotating shaft directly holds the rotating shaft or holds a bearing that supports the rotating shaft, and the eccentric cartridge is attached to the trunnion nut and its trunnion. By rotating the rolling roll in the radial direction by rotating it with a screw shaft that is screwed into the nut, the roll interval is changed.

[0003]

By the way, in the above-mentioned rolling roll, since it is necessary to ensure the proper meshing state of the gears, even if the rolling rolls are brought close to each other, the minimum distance between them is regulated by the gear. In this specification, the minimum distance between the axial centers of the rolling rolls, which is regulated to ensure the proper meshing state of the gears, is referred to as the minimum axial distance.

On the other hand, generally, in a rolling facility, when the rolling roll is worn or the rolling roll is shaved again, the screw shaft is gradually tightened to reduce the axial distance between the rolling rolls. .. As a conventional adjustment method in this case, a so-called roll touch method is applied. That is, the screw shaft is tightened to bring the rolling rolls into contact with each other, and the axial center distance in this state (which is equal to the roll diameter) is the minimum axial center distance regulated from the proper meshing state of the gears. If so, the rolling roll is being discarded as the end of its life. Therefore, in the conventional method, the rolling roll is discarded because it has reached the end of its life in a state where the roll diameter is equal to the minimum inter-center distance.

[0005]

Generally, at the time of rolling, it is necessary to set a predetermined gap between rolling rolls, that is, a roll gap, and perform rolling. Therefore, as described above, the axial center distance during actual rolling in the rolling mill of the rolling roll, which is expected to reach the end of its life, is set to the distance obtained by adding the roll gap to the roll diameter. Even with a rolling roll that is wider than the distance and thus has reached the end of its life, it is actually possible to further tighten the screw shaft for adjusting the roll gap to bring the rolling roll closer. That is, even a rolling roll that has reached the end of its life can actually be used continuously until the roll diameter reaches the diameter obtained by subtracting the roll gap from the minimum inter-axis distance. The service life of the roll can be further extended.

When the life of the rolling rolls is extended by so-called diversion, the roll diameter becomes smaller than the minimum inter-center distance, so that the rolling rolls are brought into contact with each other as in the conventional roll touch system. If the axial center distance is secured, the axial center distance at the time of contact with the rolling roll becomes smaller than the minimum axial center distance. In that case, the screw shaft for roll gap adjustment will be screwed in more than expected in the design, which will hinder the proper meshing of the gears, and the screw shaft will remain screwed into the trunnion nut. Since the screw shaft largely tilts as it is tightened, there is a risk that the screw shaft may hit the casing and be bent.

As described above, such inconvenience can be solved if the life of the roll is reached by making the roll diameter the same as the minimum center-to-center distance. However, this extends the roll life more than ever before. Can not do.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a roll gap adjusting method which does not hinder the extension of roll life.

[0009]

According to the present invention, in order to achieve the above object, one of a pair of rolls in which gears are meshed and connected to each other is eccentric with respect to its central axis. A roll gap adjusting screw shaft, which is rotatably held by an eccentric cartridge that rotates about a position, and is arranged in a direction substantially orthogonal to the axis of the roll, and a trunnion that is screwed to the screw shaft. In a roll gap adjusting method for a rolling mill, wherein the one roll is moved closer to and separated from the other roll by rotating the nut with a nut, the stopper for preventing the trunnion nut from moving along with the rotation of the screw shaft. Is installed so that the position can be adjusted, and the distance between the axes of both rolls is set in advance with the trunnion nut in contact with the stopper. By setting the position of the stopper so that the distance between the minimum axes is the same and rotating the screw shaft to bring both rolls closer to each other, both rolls are allowed to approach until the trunnion nut contacts the stopper. The feature is that the distance between them is secured.

[0010]

Also in the present invention, the roll gap is adjusted by rotating the screw shaft, for example, by tightening the screw shaft, the eccentric cartridge is rotated by the action with the trunnion nut, and as a result, one of the rolling rolls is rotated. Moves toward or away from the other rolling roll. When the rolling roll is approached by operating the screw shaft, the trunnion nut hits the stopper attached to the screw shaft to prevent the screw shaft from being tightened, that is, the rotation of the eccentric cartridge. The distance is the predetermined minimum distance between the axes. Therefore, even if the rolling roll is continuously used until it is worn out further, the rolling roll does not come closer than the above minimum inter-center distance, so that the proper meshing state of the gears is maintained, and the screw shaft is the casing. It does not cause any trouble such as hitting.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 are schematic sectional views showing an example of a rolling mill for carrying out the method of the present invention,
A pair of rolls 1 and 2 which are parallel to each other and rotatably attached to a casing 3, one roll 1 of which is a driven roll, and the other roll 2 is a drive roll which is rotated by receiving power from the outside. Has been done. That is, the driven roll 1 rotatably supports the rotating shaft 5 having the gear 4 in the middle portion with respect to the casing 3 through the eccentric cartridge 6 so that one end of the rotating shaft 5 projects from the casing 3, and Hole type (caliber) sleeve 7 on the protruding end
Is attached. Here, the eccentric cartridge 6 is
While holding the rotating shaft 5 rotatably,
Is mounted on the casing 3 so as to rotate about a position eccentric to the shaft center of the driven roll 1, i.e., the center of the driven roll 1, and a pair of left and right rotary shafts 5 are provided. By doing so, the driven roll 1 is moved in parallel in the vertical direction. The left and right eccentric cartridges 6 are connected by a plate 8 as shown in FIG. 3, and a trunnion nut 9 is held by the plate 8.

On the other hand, the drive roll 2 is rotatably attached to the casing 3 so that both ends thereof protrude from the casing 3, and a rotary shaft 11 having a gear 10 meshing with the gear 4 at an intermediate portion thereof is rotatably attached. A bevel gear 13 is attached to one of the protruding ends of the bevel gear 13 and a bevel gear 13 is attached to the other protruding end of the bevel gear 14. To enter.

The adjustment of the roll gap G in the above rolling mill is performed by rotating the eccentric cartridge 6 to move the driven roll 1 up and down, and the mechanism therefor is constructed as follows. That is, the screw shaft 15 for adjusting the roll gap is arranged in a direction substantially orthogonal to the axis of the driven roll 1.
As shown in FIG. 4, the lower end has a threaded portion, which is rotatably attached to the casing 3 via the bearing cartridge 16 in a state where the threaded portion is screwed into the trunnion nut 9. .. A cylindrical stopper 17 that defines the upper limit position of the trunnion nut 9 is detachably fitted to the upper end of the threaded portion so that the position of the trunnion nut 9 can be adjusted, and is fixed by a female screw 18.

The screw shaft 15 has a bearing flange (or step) 20 formed below the bearing 19 in a portion located in the bearing cartridge 16, and the bearing 1
9 has a configuration in which a threaded portion 21 into which a bearing nut (not shown) is screwed is formed on the upper side.
According to this, since the bearing 19 can be attached after the threaded portion is screwed into the trunnion nut 9, the work is facilitated.

In the above rolling mill, the screw shaft 15 is rotated to raise or lower the trunnion nut 9,
As the eccentric cartridge 6 rotates, the driven roll 1 moves up and down, and the roll gap G is adjusted. When the rolls 1 and 2 are worn, the screw shaft 15 is tightened to raise the trunnion nut 9 and the eccentric cartridge 6 is rotated to bring the driven roll 1 closer to the drive roll 2 to reduce the roll gap G. Maintain an appropriate value.

Here, when the driven roll 1 is made to approach the drive roll 2 by rotating the screw shaft 15 and raising the trunnion nut 8, it can be approached until the trunnion nut 9 comes into contact with the stopper 17. .. In the method of the present invention, the position of the stopper 17 is set such that the trunnion nut 9 is attached to the stopper 17 in a state where the axial center distance l of the rolls 1 and 2 becomes the minimum axial center distance l ₀ which is predetermined by the mechanism. The position of the stopper 17 is preset so as to abut. Therefore, when the screw shaft 15 is further tightened in a state where the roll diameter is smaller than the minimum inter-center distance l ₀ , the trunnion nut 9 comes into contact with the stopper 17 to further tighten the screw shaft 15. In that state, the inter-axis center distance l of the rolls 1 and 2 becomes the minimum inter-axis center distance l ₀ , and further reduction of the inter-axis center distance 1 is prevented. In the above-described state, the actual axial distance is the minimum axial distance l ₀ , and in that state, the roll gap G is generated (that is, the axial gap includes the roll gap G). Therefore, the roll diameter is ( _10- G). Therefore, in the conventional roll touch method, the roll diameter is the minimum interaxial distance l _0.
While the life has reached the end when the diameter is the same, the service life of the present invention becomes longer. Further, when the actual inter-axis distance becomes the predetermined minimum inter-axis distance l ₀ , the screw shaft 15 cannot be tightened any more, and therefore the screw shaft 15 does not incline more than expected in advance. The bending of the screw shaft 15 due to the interference with the case of the cartridge 16 does not occur.

[0018]

As described above, according to the method of the present invention, even if the roll is worn until its diameter becomes smaller than the minimum inter-center distance, the screw shaft for adjusting the roll gap is provided with Since it can be tightened only until the distance reaches the predetermined minimum center-to-center distance, there is no danger of inconvenience such as bending due to excessive tightening of the screw shaft, and the same diameter as the conventional minimum center-to-center distance. As a result, it is possible to continue to use the roll that has reached the end of its life, and as a result, it is possible to extend the life of the roll and consequently reduce the equipment cost.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an example of a rolling mill for carrying out the method of the present invention.

FIG. 2 is a sectional front view of the rolling mill of FIG.

FIG. 3 is an enlarged view taken along the line III-III of FIG.

FIG. 4 is an enlarged view showing an example of a screw shaft.

[Explanation of symbols]

 1 roll 2 roll 4 gear 9 trunnion nut, 10 gear 15 screw shaft 17 stopper

Claims (1)

[Claims] One roll of a pair of rolls that are meshed with each other and meshed with each other is rotatably held by an eccentric cartridge that rotates around a position that is eccentric with respect to its central axis.
By rotating the eccentric cartridge with a roll gap adjusting screw shaft arranged in a direction substantially orthogonal to the roll axis and a trunnion nut screwed to the screw shaft, the one roll is rotated with the other roll. In the method for adjusting the roll gap of a rolling mill that approaches and separates from each other, a stopper that prevents movement of the trunnion nut due to rotation of the screw shaft is attached to the screw shaft in a positionally adjustable manner, and the trunnion nut serves as the stopper. Set the position of the stopper so that the distance between the axes of both rolls in the abutting state becomes the predetermined minimum distance between the axes,
When the screw shaft is rotated to bring both rolls closer to each other, both rolls are allowed to come close to each other until the trunnion nut comes into contact with the stopper, so that the minimum center distance can be secured. Roll gap adjustment mechanism.