JP3091078B2 - Rolled material guiding method and roller guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for guiding a rolled material for accurately rolling a rolled material by applying a preload to a guide roller to guide the rolled material accurately by a rolling mill. The present invention relates to a roller guide device.

[0002]

2. Description of the Related Art A rolled material guiding and guiding apparatus described in Japanese Patent Application Laid-Open No. 61-266114 has been proposed by the present applicant. In this publication, a guide roller is provided on one end side of a pair of roller holders that are swingably provided, and a mechanism that adjusts the gap between the guide rollers on the other end side according to the size of the rolled material, In order to slightly widen the interval between the guide rollers from the interval adjusted according to the dimensions of the rolled material, using an induction guide device provided with a guide roller interval opening and closing mechanism driven by a hydraulic cylinder, the rolled material is Until the guide rollers are engaged, the intervals between the guide rollers are widened and made to stand by. When the rolled material is engaged with the guide rollers, the interval opening / closing mechanism narrows the interval between the guide rollers to embrace the rolled material and accurately guide the rolled material to the rolling rolls. Techniques are disclosed.

[0003]

A pair of roller holders, which are provided with a spring effect by bending, are pivotally supported on a guide box so as to be openable and closable, and guide rollers are rotatably supported on one end side of these roller holders. In the so-called "roller holder / fulcrum pin type" roller guide device of the type in which the guide rollers are caused to follow the rolled material by the above-mentioned spring effect to guide the rolled material, the rolled material may fall to some extent and the distance between the guide rollers may be reduced. Until the roller holder is bent by being pushed and expanded, no stress is generated in the roller holder. Therefore, when rolling a rolled material having a large deformation resistance, the rolled material tends to fall. Once the rolled material bites into the rolling mill in the state where it has fallen, it is not easy to correct the fall of the rolled material and return it to its original state with the embracing force of the guide rollers. It is preferable that a preload that can be prevented at the stage is applied to the guide roller from the beginning. In the guide device described in the above-mentioned publication, the interval between the guide rollers having the same configuration as that of the “roller holder / fulcrum pin type” roller guide device is narrowed by a hydraulic cylinder to hold the rolled material, and the rolled material falls down. In the case of doing, although it is effective in erecting and guiding by the rolled material tying force according to the hydraulic pressure applied to the hydraulic cylinder, since a preload in the direction of tying the rolled material is not given to the guide roller, In the initial stage, when the rolled material slightly collapses, the problem is that the embracing force of the guide roller to prevent the rolled material from falling is weak, and the cost of building a control system to control the roller guide interval by hydraulic pressure Turned out to be expensive. It is an object of the present invention to prevent rolling of a rolled material by always tying the rolled material with an optimal guide roller tying force without increasing the cost, accurately guiding the rolled material to a groove of a rolling mill, and dimensioning the rolled material. An object of the present invention is to enable a highly accurate rolled material to be rolled.

[0004]

According to the present invention, there is provided a preload applying mechanism for applying a preload in a direction in which the distance between the roller holders supporting the guide rollers is expanded, and the preload applying mechanism is provided through the preload applying mechanism. At the time of guiding the rolled material, deflection is generated in advance in the roller holder in a continuously increasing direction, and it is attempted to prevent the rolled material from falling from an initial stage by using a reaction force against the deflection, that is, a preload. Things. The optimal range of the preload for obtaining the optimal embracing force is the combination of the fulcrum pin and the roller holder and the shaft.
Eliminate play caused by mechanical tolerances in bearings and other parts
The preload is set to at least 250 kg, and the preload applied to the guide roller is selected within this range. If the preload is less than about 250 kg, the object of the present invention cannot be achieved. In the method for guiding a rolled material according to the present invention, a pair of roller holders are provided on the guide box so as to be openable and closable with fulcrum pins, and rotatably support a guide roller at one end, and one end of the roller holder. Using a roller guide device provided with a guide roller interval adjustment mechanism provided on the side of the roller and a preload applying mechanism capable of applying a load in a direction in which the roller holder provided on the other end of the roller holder is spread. The rolled material is guided after the roller holder is bent in advance and a preload of about 250 kg or more is applied to the guide roller. In order to smoothly perform the preload applying operation, it is desirable to adjust the distance between the guide rollers first before applying the preload. The roller guide device of the present invention rotatably supports a guide roller 4 on one end side of a pair of roller holders 2 provided on a guide box so as to be openable and closable with a fulcrum pin,
On the other end side, a tension spring is provided in the direction of pulling the roller holder, and it is provided on the guide box, and adjusts the interval between a pair of spindles that are inscribed on one end side of the roller holder and have opposite screws and are opposite each other. A guide roller spacing adjustment mechanism provided with a turnbuckle mechanism consisting of a nut and a pair of spindles provided in the guide box and inscribed at one end side of the roller holder and having mutually opposite screws and a gap between these spindles And a preload applying mechanism having a turnbuckle mechanism comprising a nut for adjusting the load. The preload applying mechanism is provided to the guide roller through the roller holder and to a set of a fulcrum pin and a roller holder.
Due to mechanical tolerances of mating parts, shaft and bearing parts, etc.
At least about 2 to the extent that backlash can be removed.
A preload of 50 kg or more can be applied. If the tension spring is provided in the roller guide device, the tension spring serves to prevent the roller holder from rattling.

[0005]

The guide roller gap is adjusted to a required distance by the guide roller gap adjusting mechanism, and at least about 250 mm is applied to the roller holder holding the guide roller by the preload adjusting mechanism.
Preload of more than kg is given. About 25 for roller holder
When a preload of 0 kg or more is applied, it is possible to remove backlash caused by machining tolerances such as a combination portion of a fulcrum pin and a roller holder, a shaft and a bearing portion, which constitute a part of the roller guide device, and a roller. A region where the amount of bending of the holder and the characteristics of stress are non-linear can be removed. When the rolled material is guided, even if the rolled material is slightly inclined, since the hiding force of the preload of about 250 kg or more is applied to the guide roller from the beginning, the rolled material is less likely to fall. Even if the roll starts to fall, the roller holder is pressed by the guide roller and bends, so that the rolled material has a preload of about 250 kg or more, and the applied embracing force gradually increases according to the amount of bending of the roller holder. Is added, it is possible to accurately guide the rolled material without causing collapse from the initial stage.

[0006]

An embodiment of the present invention will be described with reference to the drawings. The method for guiding a rolled material according to the present invention uses a roller guide device capable of applying a preload. For example, using a roller guide device shown in FIGS. The distance between the guide rollers is adjusted to a required size according to the size of the material, and a load is applied to the roller holder 2 by the preload applying mechanism B to at least about 250 k.
By applying a preload of g or more to the guide roller,
This guides the rolled material accurately to the groove of the rolling mill.

A roller guide device according to the present invention will be described with reference to FIGS. A pair of roller holders 2 are rotatably supported on a guide box 1 by fulcrum pins 3 so as to be openable and closable. A guide roller 4 is rotatably supported by roller pins 4a at the front end (right end in FIG. 1) of the roller holder. It is. A guide roller interval adjusting mechanism A is provided on the front end side of the guide box 1, and a preload applying mechanism B is provided on the rear end side (the left end side in the figure). The guide roller interval adjusting mechanism A is provided with a pair of spindles 5 and nuts 6 having mutually opposite screws, and the spindle and the nut constitute a turnbuckle mechanism. A male screw part (not shown) of the spindle 5 is engaged with a female screw part (not shown) of the nut 6, and by rotating this nut, the spindle 5 comes in and out, and the interval between the spindles is adjusted. In addition, the distance between the roller holders 2 that are in contact with the respective spindles via the pressure screw 7 can be opened and closed, and therefore the distance between the guide rollers 4 can be adjusted. The preload applying mechanism B has the same mechanism as the guide roller interval adjusting mechanism A, and is provided with a pair of spindles 15 and nuts 16 having mutually opposite threads, and the spindle and the nut constitute a turnbuckle mechanism. Make up. A male screw part (not shown) of the spindle 15 meshes with a female screw part (not shown) of the nut 16. By rotating this nut, the spindle comes in and out, and the pressure screw 17 is connected to these spindles. By pressing the roller holder 2 that is in contact therewith, the roller holder can be bent. By this bending, a preload can be applied to the guide roller 4 provided on the roller holder 2. Further, the roller holder 2 is pulled by a tension spring 18 stretched between its rear ends, and the pressure screw 1
7 is in contact with the spindle 15. In FIG. 2, R
Is a rolling roll.

Here, a case where a rolled material is guided by the roller guide device shown in the above example will be described. According to the calculation based on the test data at the time of rolling, as shown in FIG. 3, when the torque arm guides an oval-shaped rolled material of d = about 16 mm, a roller holder having a rigidity of about 300 kg / mm is used. It has been found that applying a preload of about 250 kg to the guide roller can prevent the rolled material from falling down.
In the hugging force of the roller guide device capable of applying a preload shown in this example, a preload of about 250 kg is generated in a state where the amount of increase in the interval between the guide rollers is zero as shown by a straight line P shown by a solid line in FIG. On the other hand, in a roller guide device that does not have a mechanism for applying a preload that cannot be applied, that is, a preload cannot be applied,
When a roller holder having a rigidity of about 300 kg / mm is used in a state where the preload is zero, the increase in the interval between the guide rollers is 0.5 mm as indicated by a straight line P1 shown by a dashed line in FIG.
It was confirmed that no embracing force was generated until. This is because even if the distance between the guide rollers is wide, there is play due to machining tolerances such as a combination of a fulcrum pin and a roller holder, a shaft and a bearing, which constitute a part of the roller guide device. It is considered that the roller holder does not bend until the distance between the rollers increases beyond a certain distance. The following can be considered as reasons why the rolled material frequently collapses in the roller guide device to which no preload is applied. First, if the distance between the guide rollers adjusted as described above does not widen by 0.5 mm, the roller holder does not bend, so that the holding force of the rolled material as a reaction force does not occur. Secondly, in the roller guide device not provided with the mechanism for applying the preload, a reaction force of about 300 kg / mm is applied until the rolled material falls down and the amount of increase in the distance between the guide rollers becomes 1 mm. Since the rolled material is not generated as the embracing force of the rolled material, it is considered that the embracing force at the time when the rolled material starts to fall is insufficient due to the combination with the first reason, and the rolled material is caused to fall.

In FIG. 3, the torque arm is d = about 16 mm.
Although the case of inducing the oval-shaped rolled material has been described, even if it is smaller or larger than about 16 mm, the preload is set to at least about 250 kg or more, and rolling is performed by referring to past rolling data or predicted rolling load. The optimum preload is set according to the steel type of the material. In this way, at the time of guiding the rolled material, the optimal preload is applied to the guide roller according to the rolled material, and at the time of application, the optimal preload is applied to the guide roller in a range of at least about 250 kg or more, and gradually increased. With this preload, it is possible to always guide the rolled material with an optimum embracing force and to accurately guide the rolled material to the groove of the rolling mill.

[0010]

According to the present invention, a combination of a fulcrum pin and a roller holder is provided to a guide roller through a roller holder.
Backlash due to mechanical tolerances of parts, shafts and bearings
By applying a preload that is sufficient to remove the rolled material, the embracing force accompanying the optimal preload is always applied. The rolled material can be reliably prevented from falling from the initial stage by tying the rolled material, and the rolled material can be accurately guided to the groove of the rolling mill, and therefore, a rolled material with high dimensional accuracy can be rolled. Will be possible.

[Brief description of the drawings]

FIG. 1 is a plan view of a roller guide device according to the present invention.

FIG. 2 is a front view of the roller guide device according to the present invention.

FIG. 3 is an enlarged front view showing a guide roller and an oval shape during guidance.

FIG. 4 is a graph showing a relationship between a guide roller interval increase amount and a load applied to a guide roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide box 2 Roller holder 3 Support pin 4 Guide roller 4a Roller pin 5 Spindle 6 Nut 7 Pressure screw 15 Spindle 16 Nut 17 Pressure screw 18 Tension spring A Guide roller interval adjustment mechanism B Preload applying mechanism

Claims (3)

(57) [Claims] 1. A rolled material is formed into a groove of a rolling mill by a roller guide device in which a guide roller is rotatably supported at one end side of a pair of roller holders provided on a guide box so as to be opened and closed with fulcrum pins. A method for guiding, wherein a guide roller interval adjusting mechanism provided on one end side of the roller holder adjusts the interval between the guide rollers to a required size in accordance with the dimension of the rolled material, and the other end of the roller holder A load is applied to the roller holder by a preload applying mechanism provided on the side of the unit, and the roller holder is preliminarily bent so that the guide roller is combined with the fulcrum pin / roller holder combination part, shaft and base.
To eliminate backlash caused by mechanical tolerances such as
A method for guiding a rolled material, wherein a rolled material is guided after a preload is applied to such an extent as possible. 2. The method for guiding a rolled material according to claim 1, wherein a preload is applied to the roller holder by a preload applying mechanism after adjusting a distance between the guide rollers. 3. A pair of roller holders provided on a guide box so as to be openable and closable with a fulcrum pin, and a guide roller rotatably supported on one end side, and one end of the roller holder provided on the guide box. A guide roller spacing adjustment mechanism provided with a turnbuckle mechanism comprising a pair of spindles inscribed on the sides and having opposite threads and a nut for adjusting the spacing between these spindles; A preload applying mechanism having a turnbuckle mechanism including a pair of spindles inscribed on the other end side and having mutually opposite threads and a nut for adjusting the interval between these spindles; mechanism is a possible applying a load in a direction to widen press the roller holder, and the guide rollers, the pivot pin and the roller holder assembly Combined portion and the shaft
To eliminate backlash caused by mechanical tolerances of bearings and bearings
A roller guide device capable of applying a preload to the extent possible.