JP2017070965A - Roller guide for compact mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller guide for a compact mill which prevents the occurrence of guide clogging or the like accompanied by falling of steel material to be rolled and biting defection, improves quality of the steel material to be rolled and simplifies the constitution.SOLUTION: A pair of pressure pins 71A, 71B and a pair of disc springs 72A, 72B which constitute a falling prevention mechanism 7 of steel material to be rolled are assembled onto a position corresponding to a rear part of respective roller holders 3A, 3B having a spring constant in the range of 25 to 300 kN/mm as the rear part side of a guide box 1 and, thereby, a cohesive force of the steel material to be rolled equal to a roller guide for general purpose mills used when a distance between conventional stands is long is retained by combination of flexure of the respective disc springs 72A, 72B and flexure of the respective roller holders 3A, 3B when the steel material passes through the guide roller.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a roller guide for a compact mill that guides and guides a rolled steel material.

  The roller guide used for guiding the steel material to be rolled is attached to the guide box through a fulcrum pin so that it can be opened and closed, and in order to maintain the posture of the steel material to be rolled, a pair of beam-shaped roller holders are installed in the longitudinal direction. Provided. And the guide roller which hold | maintains the said to-be-rolled steel material in the front-end | tip part of each roller holder, respectively, and the opening degree adjustment mechanism which consists of an adjustment screw and a tension spring in the rear-end part side. The steel material to be rolled is held by an elastic force due to the bending of the distance between the fulcrum pin of the roller holder and the guide roller (for example, JP-A-6-15334).

JP-A-6-15334

Generally, the roller gap of the roller guide is set to be negative with respect to the size of the steel material to be rolled, and the steel material to be rolled is held by the elastic force due to the opening of the roller holder when the steel material is rolled.
However, in the compact mill roller guide between the stands, since the distances between the fulcrum pin and the guide roller and the fulcrum pin and the adjusting screw in each of the roller holders are short, the rigidity becomes high. A slight change in the bending amount of each roller holder causes a large change in the load for bending these roller holders. Therefore, it is difficult to set a roller gap to ensure an appropriate holding force for the steel material to be rolled. In other words, if the roller gap is wider than the steel material to be rolled, the above holding force cannot be obtained, and the steel material to be rolled becomes easy to fall. On the other hand, if it is narrow, the load that causes the roller holder to bend becomes an overload. There is a problem that the steel material to be rolled buckles due to resistance when the steel material to be rolled is bitten, and so-called guide clogging occurs.
An object of the present invention is to provide a roller guide for a compact mill that prevents the occurrence of guide clogging due to a fall of the rolled steel material and a biting failure, improves the quality of the rolled steel material, and has a simple configuration. is there.

In the present invention, the guide box is provided with a pair of roller holders with the fulcrum pin as the rotation center, the guide roller is attached to the tip of each of the roller holders via the roller pin, and each roller holder on the rear side of the guide box. Incorporating a pair of pressure pins and a pair of disc springs that constitute a fall prevention mechanism of the rolled steel material at a position corresponding to the rear portion, the bending of each disc spring when the rolled steel material passes through the guide roller And the bending of each of the roller holders described above are combined to hold the conjugation force of the steel material to be rolled equivalent to that of a general-purpose mill roller guide used when the distance between conventional stands is long. That is, at the front end portion and the rear end portion that are unsteady portions of the steel material to be rolled, the load applied to the roller holder when they pass between the pair of guide rollers, Receiving with both deflections of the roller holder, the space between the surfaces of the both guide rollers is widened, and even in the body of the rolled steel material excluding the leading end and the trailing end, which are stationary portions, the deflection of the roller holder and the disc spring The steel material to be rolled can be conjugated between regular surfaces through bending. That is, in the present invention, the steel material to be rolled is guided and guided over the entire length through both the bending of the disc spring and the bending of each roller holder.
The central distribution mechanism includes a pair of screw spindles provided opposite to each other in the guide box and opposite to each other, and a square bar that is screw-coupled at both ends of both screw spindles and serves as a rotating means thereof. Become. By rotating the square bar, the pair of guide rollers located at the tip of each roller holder through the pair of pressure pins and the square bar of the roll-up prevention mechanism of the steel material to be rolled via the screw spindles. Can be opened and closed by center allocation.
The disc springs are formed by laminating a plurality of disc springs, and the number of these can be changed.
Each screw spindle is in contact with the contact portion of each pressure pin, and the spring force of each disc spring is biased.
The spring constant of each roller holder can be changed by changing the number of the disc springs, that is, the spring constant can be selected. The range of the spring constant of each roller holder is 25 kN / mm to 300 kN / It is good that it is mm.

  According to the compact mill roller guide according to the present invention, since the steel material to be rolled is held by the combination of both the deflection of the disc spring and the deflection of each roller holder over the entire length of the steel material to be rolled, Can hold the same strength of the rolled steel as the roller guide, prevents the rolled steel from falling and biting failure, and can improve the quality of the rolled steel. It is possible to provide a roller guide for a compact mill that is simple.

It is a top view which shows the roller guide for compact mills concerning this invention. It is a front view which shows the roller guide for compact mills concerning this invention. It is a side view which shows the roller guide for compact mills concerning this invention. It is sectional drawing which shows the installation state of the center distribution mechanism in the roller guide for compact mills based on this invention, and the fall prevention mechanism of a to-be-rolled steel material. It is a side view in which a guide roller in a roller guide for a compact mill according to the present invention shows an enlarged conjugated state of a steel material to be rolled.

The compact mill roller guide according to the present invention will be described with reference to the drawings.
1 to 3 includes a guide box 1, a pair of roller holders 3A and 3B attached to the guide box so as to be openable and closable around a fulcrum pin 2, and a roller pin 4 at the tip of each roller holder. Are provided with a pair of guide rollers 5A and 5B which are rotatably provided, a central sorting mechanism 6 disposed on the rear side of each roller holder, and a fall prevention mechanism 7 for the rolled steel material.

1 to 3, each fulcrum pin 2 serving as the rotation center of the pair of roller holders 3 </ b> A and 3 </ b> B is inserted into the upper and lower portions of the guide box 1 in FIG. 2. With respect to the guide box 1, the roller holders 3A and 3B are opened and closed in a substantially “C” shape in plan view via the respective fulcrum pins 2.
Each roller pin arranged at the tip of the pair of roller holders 3A and 3B makes the pair of guide rollers 5A and 5B rotate smoothly by the bearing 8.

As shown in FIGS. 1 to 4, the center distribution mechanism 6 disposed on the rear side of the pair of roller holders 3 </ b> A and 3 </ b> B is provided in the guide box 1 with mutually opposite screws and facing each other in the vertical direction in FIG. 1. A pair of screw spindles 61A and 61B, and a square bar 62 as a rotating means of these screw spindles. Each screw spindle 61 </ b> A, 61 </ b> B is incorporated in the upper rear part of the guide box 1. Each of the screw spindles 61A and 61B is covered with a bush 63 in order to rotatably support them on the guide box 1. As shown in FIG. 4, each bush 63 is fixed to the upper part of FIG. 3 at the rear end of the guide box 1 by a lock nut 64.
Further, as shown in FIG. 4, male screw portions are formed at both ends of the square bar 62, and the respective male screw portions are engaged with the female screw portions of the screw spindles 61A and 61B. As described above, the left and right screw spindles 61A and 61B are slidably connected by the square bar 62, and by rotating the square bar, the guide rollers 5A and 5B are opened and closed by the central distribution through the rotation of the left and right male screw portions. .

As shown in FIGS. 1, 2, and 4, the steel roll toppling prevention mechanism 7 disposed on the rear end side of the pair of roller holders 3A and 3B includes a pair of pressure pins 71A and 71B and a disc spring 72A. , 72B.
The pressure pins 71A and 71B are disposed in spring cases 73A and 73B that are fitted and fixed to the upper part of FIG. The spring cases 73A and 73B are opened on the roller holders 3A and 3B side, and the openings are opposed to the screw spindles 61A and 61B at the rear ends of the roller holders 3A and 3B with a slight gap therebetween. . The pressure pins 71A and 71B are formed in a “mushroom” shape, and the abutting portions 71A1 and 71B1 corresponding to the umbrellas abut against the opposing end surfaces of the screw spindles 61A and 61B. The base end side of each pressure pin 71A, 71B is screwed into the spring case 73A, 73B. Therefore, by pressing the pressure pins 71A and 71B, the pressing force can be adjusted with respect to the screw spindles 61A and 61B through the contact portions 71A1 and 71B1.

Each disc spring 72A, 72B plays a role as an impact relaxation spring. As shown in FIG. 4, the disc springs 72A and 72B are located in the spring cases 73A and 73B, and between the inner bottom portions of the spring cases and the contact portions 71A1 and 71B1 of the pressure pins 71A and 71B. A plurality of sheets are assembled in a laminated state so as to surround the pressure pin. The disc springs 72A and the disc springs 72B facing each other are curved in a convex shape in the opposing direction and apply spring force to the contact portions 71A1 and 71B1. For this reason, the disc springs 72A and 72B are in contact with the abutting portions 71A1 and 71B1 of the pressure pins 71A and 71B, respectively, on the opposing end surfaces of the screw spindles 61A and 61B with a predetermined pressure.
In other words, the spring force of the disc springs 72A and 72B is directed toward the direction of opening between the tip ends with respect to the pair of roller holders 3A and 3B through the pressure pins 71A and 71B, and both rear end portions on the opposite side. A spring force is applied in the direction of closing the gap. For this reason, when the steel material S (FIG. 5) passes through the guide rollers 5A and 5B, the space between the guide rollers resists the spring force of the disc springs 72A and 72B, and the deflection of the disc spring increases. And spread. As a result, the impact of the rolled steel S and the guide rollers 5A and 5B is alleviated by the disc springs 72A and 72B. After the tip of the steel material S to be rolled passes through the guide rollers 5A and 5B, although the deflection of the disc springs 72A and 72B is smaller than that before passing, the holding action by the deflection is maintained, and the deflection of the disc spring and the roller holder 3A, Based on the cooperative action with the bending of 3B, the guide rollers 5A and 5B can tie the rolled steel material S between regular surfaces.

Regarding the rigidity of the roller holders 3A and 3B, the above-described disc springs 72A and 72B are overlapped to form the rigidity. And the spring constant of roller holder 3A, 3B is made variable by changing the number of the disk springs 72A, 72B. That is, this spring constant can be selected. The range of the spring constant of the roller holders 3A and 3B is preferably 25 kN / mm to 300 kN / mm. If it is less than 25 kN / mm which is the lower limit, there is a possibility that the roller guide cannot be formed from the movable space surface. If the upper limit of 300 kN / mm is exceeded, there is a risk that buckling will occur when the steel material to be rolled enters the roller guide.
In addition, regarding the usage ranges of the disc springs 72A and 72B, the maximum deflection of the disc springs should be 80% or less of the height of the disc springs in order to obtain a stable long life (1 year or more). . This is because if the disc spring is compressed to near maximum deflection, the load increases cumulatively and the life is shortened.

As shown in FIGS. 2 and 3, an entry guide 9 is provided in the guide box 1 for auxiliary guidance of the steel material S to be rolled. A pair of push bolts 10 penetrates the holes formed in the thickness direction of the roller holders 3A and 3B from the left and right sides of the guide box 1 at substantially the middle position in the top and bottom of FIG. 3 and are screwed into the guide box. The tip portion is in contact with both sides of the entry guide 9. The entry guide 9 is fixed to the guide box 1 by screwing each push bolt 10. In the guide box 1, a pair of holding bolts 11 is disposed immediately below the pair of push bolts 10. Each holding bolt 11 passes through a hole formed in the thickness direction of each roller holder 3A, 3B, and the tip thereof is screwed into the guide box. The pair of holding bolts 11 bears a role of assisting the guide box 1 in holding the roller holders 3A and 3B.
A spring 12 is wound around the head side of each holding bolt 11 located inside each roller holder 3A, 3B. The rear end side of each roller holder 3 </ b> A, 3 </ b> B is pressed by the spring force of the spring 12 so as to contact the rear part of the guide box 1.

Since the roller guide for a compact mill according to the present invention has the above-described configuration, as shown in FIGS. 1 to 4, the square bar 62 in the center distribution mechanism 6 is appropriately rotated in advance so that the pair having a reverse screw relationship with each other. The screw spindles 61A and 61B are moved away from or approaching each other. As the screw spindles 61A and 61B move, the rear end portions of the roller holders 3A and 3B open and close, and the central distribution of the intervals between the guide rollers 5A and 5B provided on the front end portions is adjusted.
In the process in which the rolled steel material passes between the guide rollers 5A and 5B at the time of guiding the rolled steel material S, the tip side of each roller holder 3A, 3B bends and spreads, and at the same time, the roller holder rotates around the fulcrum pin 2 Since the rear end side is narrowed, the disc springs 72A and 72B are bent, and the space between the surfaces of the guide rollers is further expanded and expanded (opened), so that the impact of the guide rollers 5A and 5B and the like is reduced as described above. The And after the front-end | tip part of the to-be-rolled steel material S passes between the guide rollers 5A and 5B, since the elastic force by the bending of the disc springs 72A and 72B gradually weakens, the rear end sides of the roller holders 3A and 3B are separated from each other. Rotating around the fulcrum pin 2 in the direction and returning to its original position, the steel to be rolled is brought into contact with the normal surfaces of the guide rollers 5A and 5B through the appropriate holding force by the bending of each roller holder and the bending of the disc springs 72A and 72B. It will be conjugated between.
In any case, in the compact mill roller guide according to the present invention, the bending of the disc springs 72A and 72B and the bending of the roller holders 3A and 3B in the process of guiding and guiding the entire length of the steel material S to be rolled. By combining both of these, it is possible to ensure an appropriate holding force for the steel material to be rolled.

By the way, the transition of the individual bending changes of the roller holders 3A and 3B and the disc springs 72A and 72B and the transition of the bending change of the combination of both are shown in Table 1 below, respectively.
The horizontal axis of the graph indicates the deflection, and the vertical axis indicates the load (stress).
Regarding the roller holders 3A and 3B, it can be understood that the bending line α of the roller holder indicated by a thin line is not so large even when a load is applied, and the inclination angle is small.
As for the disc springs 72A and 72B, the deflection line β of the disc spring indicated by the dotted line gradually increases as the load is applied, compared with the inclination angle of the deflection lines of the roller holders 3A and 3B. Draws a straight line that increases, but eventually reaches the position where the two-dot chain line δ1 indicating the maximum load of the disc spring and the two-dot chain line δ2 indicating the maximum deflection of the disc spring intersect, the amount of load and deflection thereafter changes in amount. I can understand that there is no.
The combined deflection line γ of both the roller holders 3A, 3B and the disc springs 72A, 72B gradually inclines to the right side from the deflection line α of the roller holder and the deflection line β of the disc springs. It can be understood that the inclination angle of the bending line is reduced.
The maximum load of the disc springs 72A and 72B is received by both the roller holders 3A and 3B and the disc springs 72A and 72B so as to hold the conjugation force of the steel material S to be rolled. As described above, when the front and rear ends, which are unsteady portions of the rolled steel material S, pass between the guide rollers 5A and 5B, the deflection of both the roller holders 3A and 3B and the disc springs 72A and 72B is used. Then, the guide rollers 5A and 5B are widened, and even in the stationary part, which is the main body excluding the front and rear ends, the roller holder is bent and the disc spring is bent as well as the proper holding force. The steel material to be rolled can be conjugated.

S Rolled Steel 1 Guide Box 2 Supporting Pin 3A, 3B Roller Holder 4 Roller Pin 5A, 5B Guide Roller 6 Center Distribution Mechanism 61A, 61B Screw Spindle 62 Square Bar (Rotating Means)
7 Rolling prevention mechanism 71A, 71B Pressure pin 71A1, 71B1 Pressure pin contact part 72A, 72B Belleville spring 9 Entry guide

Claims (3)

A guide box, a pair of roller holders rotatably attached to the guide box via a fulcrum pin, a pair of guide rollers rotatably provided around the roller pin at the tip of each roller holder, It is equipped with a central sorting mechanism arranged on the rear side of the roller holder and a fall prevention mechanism for the rolled steel material consisting of a pair of pressure pins and a pair of disc springs,
The central distribution mechanism includes a pair of screw spindles provided opposite to each other and opposite to each other on the guide box, and a square bar that is screw-coupled to both screw spindles at both ends and serves as a rotating means thereof. Become
Each of the screw spindles is rotatably incorporated in the upper rear portion of the guide box,
Each of the pressure pins is disposed in a state of being opposed to each other in the rear portion of the guide box, and the tip side is a contact portion,
Each of the disc springs is disposed in the rear end portion of each of the roller holders so as to face each other, is provided so as to surround each of the pressure pins, is formed by laminating a plurality of sheets, and Can be changed,
Each screw spindle is in contact with the contact portion of each pressure pin, and the spring force of each disk spring is biased,
It is possible to change the spring constant of each roller holder by changing the number of disc springs.
By rotating the square bar, the guide roller can be centrally distributed through each screw spindle, each pressure pin, and each roller holder.
A roller guide for a compact mill of a steel to be rolled, wherein the steel to be rolled can be guided through the cooperative action of both the bending of each roller holder and the bending of each disc spring over the entire length.   2. The roller guide for a compact mill of a steel material to be rolled according to claim 1, wherein a range of a spring constant of each roller holder is 25 kN / mm to 300 kN / mm.   The roller guide for a compact mill of a steel material to be rolled according to claim 1 or 2, wherein the maximum deflection of the disc spring is 80% or less of the height of the disc spring.

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