JP3239318B2 - Roll alignment adjustment device for rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roll alignment adjusting device for a rolling mill. More specifically, in a wire rod rolling mill that rolls a bar or wire rod with a plurality of grooved rolls, a roll that adjusts the alignment of each roll when assembling the rolling mill, or when exchanging rolls during size change or wear. The present invention relates to an alignment adjusting device.

[0002]

2. Description of the Related Art As a conventional roll alignment adjusting method, there is a method described in Japanese Utility Model Publication No. Hei 8-10423 in which a shim (thin plate for adjusting the thickness) is sandwiched between a roll side surface and a housing (conventional example I). ). In the conventional example I using this shim, first, it is predicted and set, and after measuring the presence or absence of misalignment, disassemble and replace the shim again, repeat this work, and perform final assembly when there is no misalignment. is there. However, in the conventional example I, the disassembly, the measurement, and the assembling must be performed many times, which is very troublesome. Further, an adjusting device (conventional example II) described in Japanese Patent Publication No. 4-16243 discloses a method of rotating two operation shafts,
By pushing and pulling the pin, the two boxes are moved in parallel with the eccentric axis, and the roll is adjusted to match the pass line. However, in the conventional example II as well, the two operation axes on both sides of the roll must be operated at the same time, and different operations must be performed to pull one and push the other. If there is any gap between the boxes, there is a problem that the misalignment occurs immediately.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present inventors
One side of the roll shaft was pressed by a spring, and the taper shaft was arranged in the orthogonal direction on the opposite side, and the center of the roll shaft was adjusted by inserting and removing the taper shaft. However, according to this structure, the axial holding force of the roll is reduced due to the wear of the tapered surface or the contact surface of the pressing spring, so that the axial rigidity is reduced and the roll position may be shifted. In addition, a structure in which the end of the roll shaft and the end of the adjustment shaft are connected by a keeper plate and the advance / retreat of the adjustment shaft is transmitted to the roll shaft via the keeper plate was also studied. However, this structure also requires a gap to be provided at the end face of the keeper plate from the beginning in order to enable rotation of the roll shaft, so that the roll position accuracy cannot be kept high.

As described above, if the cores of two, three, or four hole-shaped rolls are not perfectly aligned around the pass line, if the cross-sectional shape of the bar obtained by rolling is circular. Needless to say, the dimensional accuracy also decreases.
Therefore, the present invention can adjust the alignment of a plurality of hole-type rolls accurately with extremely simple operation, and further, there is no wear, deformation, etc. against the axial force for a long time, and there is no axial play of the roll unit, It is another object of the present invention to provide a roll alignment adjusting device that can rotatably support an axial force.

[0005]

According to a first aspect of the present invention, there is provided a roll alignment adjusting device for a rolling mill, comprising: a plurality of hole-shaped rolls arranged at equal circumferential intervals around a pass line through which a rod or wire passes. And a roll shaft rotatably supporting each of the grooved rolls, wherein an alignment adjusting device for the grooved rolls is screwed into a casing or a member integral with the casing so as to be capable of screwing. An intermediate shaft for transmitting the screwing operation of the adjusting screw to the roll shaft, a free-rotation coupling for rotatably connecting the adjusting screw and one end of the intermediate shaft via a thrust bearing, And a centering coupling that is centered and coupled to the roll shaft. According to a second aspect of the present invention, in the roll alignment adjusting device for a rolling mill according to the first aspect, the first thrust bearing has the free rotation type coupling axially separated at one end of the intermediate shaft. A second thrust bearing; and a bearing holder accommodating the first and second thrust bearings and connecting one end of the intermediate shaft to the adjusting screw, the bearing holder being coupled to an end of the adjusting screw. The inner wall surface is screwed into the holder main body from the intermediate shaft side with the holder main body abutting on the first thrust bearing,
The inner wall surface is formed of a retainer that contacts the second thrust bearing. According to a third aspect of the present invention, in the roll alignment adjusting device for a rolling mill according to the first aspect, the centering-type coupling is formed at a coupling portion formed at the other end of the intermediate shaft and at an end of the roll shaft. And a half-coupling composed of a pair of coupling halves connecting these two coupling parts,
Each of the coupling portions has a flat end surface that is in contact with each other and a tapered surface on the back side. Each of the pair of coupling halves has a semicircular coupling groove formed therein. A feature is that both side surfaces of the groove are formed as tapered surfaces.

According to the first aspect of the present invention, the thrust bearing incorporated in the free-rotation type coupling enables the rotation of the roll shaft even when the axial interval is reduced to zero, thereby reducing the axial force. In contrast, wear and deformation are eliminated, high reliability is obtained, and play in the axial direction of the roll unit can be eliminated. According to the invention of claim 2, when the retainer of the bearing holder is screwed into the holder main body, the first thrust bearing and the second thrust bearing are fixed to the bearing holder without a gap, and as a result, the intermediate shaft is in a state where there is no axial gap. Coupled to the adjustment screw. However, the first and second thrust bearings allow rotation of the intermediate shaft. For this reason, there is no abrasion or deformation due to the axial force, and the backlash in the axial direction of the roll unit can be eliminated. According to the invention of claim 3, when the coupling portion of the intermediate shaft is put into the coupling groove of the coupling half together with the coupling portion of the roll shaft, and the pair of coupling halves are tightened together, the taper on the back side of both coupling portions is obtained. The surfaces are guided by the tapered surfaces on both sides of the coupling groove of the coupling half and are guided so that their axes coincide. For this reason, the intermediate shaft is centered with respect to the roll shaft only by coupling with the half-coupling, so that assembling is not required. In addition, since the resistance force to separate in the axial direction is extremely large, there is no play in the axial direction during operation, and the reliability is improved.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a roll alignment adjusting device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the alignment adjusting device, FIG. 3 is an exploded perspective view of a centering type coupling 70, and FIG. FIG. 5 is a front view of the four-roll rolling mill to which the present invention is applied, and FIG. 5 is also a front view of the same four-roll rolling mill.

First, the basic configuration of a four-roll rolling mill to which the present invention is applied will be described with reference to FIGS. Reference numerals 1 and 2 denote a pair of horizontal rolls arranged above and below the pass line.
4 is a vertical roll installed on the left and right of the pass line.
The horizontal rolls 1 and 2 and the vertical rolls 3 and 4 are arranged orthogonally to each other, and are rolled by the grooved rolls 1 to 4 so that the rod wire is reduced in diameter and finished to a desired final diameter. Each of the rolls 1 to 4 is rotatably supported by a housing 6 by an eccentric roll shaft 5.

A worm wheel 11 is integrally formed at one end of the roll shaft 5, and a worm 12 meshes with the outer periphery of the worm wheel 11. When the adjusting shaft 22 provided with the worm 12 is rotated by the adjusting levers 20 and 30 via the connecting shaft, the worm wheel 11 is rotated.
Rotates at a speed of several tenths, and the roll shaft 5 also rotates. In this case, since the roll shaft 5 is eccentric, the rolling reduction of the rolls 1 to 4 is adjusted with the revolution of the center of the shaft. In the present invention, the reduction amount adjusting mechanism is
It is optional and does not prevent adoption of various other mechanisms.

Next, the details of the roll alignment adjusting device will be described with reference to FIGS. As shown in FIG.
The journal portions 5a at both ends of the roll shaft 5 are
The shaft center portion 5b is rotatably held by a roll holding cylinder 9 via two bearings 8, and the roll holding cylinder 9 has a hole-shaped roll 1
To 4 are held one by one. The two bearings 8 are pre-loaded so that the axial clearance is zero. An external gear 10 for receiving a rotational driving force from the outside is formed at one end of the roll holding cylinder 9. And this roll 1
4 and the roll holding cylinder 9 always rotate during rolling. In addition,
O1 is the axis of the journal portion 5a of the roll shaft 5;
Reference numeral 2 denotes an axis of the shaft center portion 5b.
Is separated from the rotation center O1 of the roller 1 and the rotation center O2 of the rolls 1 to 4, so that the roll shaft 5 is configured as an eccentric shaft.

Next, an outline of the roll alignment adjusting device will be described. The adjusting device includes an adjusting screw 40 and an intermediate shaft 50.
A free-rotation coupling 60 rotatably connecting the adjusting screw 40 and the intermediate shaft 50;
Coupling 70 for connecting the shaft to the shaft end of the roll shaft 5
It is composed of

The details of the alignment adjusting device will be described with reference to FIG. An end plate 6a is integrally fixed to the housing 6, and the gap between the housing 6 and the end plate 6a in the axial direction of the roll shaft 5 is zero. The adjusting screw 40 is screwed into the end plate 6a, and is fixed by a lock nut 41.
A recess 42 for inserting and turning a tool is provided at the tip.
Are formed. The intermediate shaft 50 is provided with the adjusting screw 4
0 and the extension shaft 5 c of the roll shaft 5. A free rotation type coupling 60 connects the intermediate shaft 50 and the adjusting screw 40, and mainly includes first and second thrust bearings 61 and 62 and a bearing holder 63. That is, a bearing mounting bracket 51 is provided at the end of the intermediate shaft 50,
Fixed at 2. A first thrust bearing 61 is attached to the distal end side of the bearing attachment bracket 51, and a second thrust bearing 62 is attached to the back side thereof. The bearing holder 63 includes a holder main body 64 and a retainer 65. The holder main body 63 is a cylindrical member having a deep hole, and a top surface thereof is integrally fixed to the adjusting screw 40. The retainer 65 is a shallow-hole cylindrical member, and has a top surface formed with a hole 66 through which the intermediate shaft 50 passes. A male screw 67 is formed on the outer periphery of the distal end of the holder body 64, and a female screw 68 is formed on the inner periphery of the distal end of the retainer 65. The retainer 65 is screwed into the holder main body 64 and fixed. . Reference numeral 69 denotes a locking screw for fixing the retainer 65.

The first and second thrust bearings 61,
For the bearing 62, any bearing can be used as long as it is strong against a thrust load. For example, a needle bearing having a large load capacity is preferable. As shown in the drawing, when the first and second thrust bearings 61 and 62 are put in the holder body 64 and tightened in the axial direction by the retainer 65,
The first thrust bearing 61 is in contact with the inner wall surface of the holder body 64, and the second thrust bearing 62 is
5 in contact with the inner wall surface, with no gap in the axial direction,
The adjustment shaft 40 and the intermediate shaft can be connected. Moreover, the intermediate shaft 50
Is free to rotate.

The intermediate shaft 50 and the extension shaft portion 5c extending from the roll shaft 5 are detachably connected by an alignment type coupling 70. As shown in FIG. 3, the centering type coupling 70 includes a coupling portion 53 formed on both the intermediate shaft 50 and the extension shaft portion 5 c of the roll shaft 5, and a half coupling 71 for coupling the coupling portion 53. Have been. The connecting portion 53 has a flat end surface 54 and a tapered surface 55 on the back side. A connecting portion 53 having the same shape is also formed on an extension shaft portion 5c extending from the roll shaft 5.

On the other hand, the half coupling 71 is composed of a pair of coupling halves 72, and the coupling halves 72 can be detachably connected by bolts or the like. Each coupling half 72 has a semicircular connecting groove 73 for receiving the connecting portion 53, and both side surfaces thereof are formed as tapered surfaces 74 corresponding to the tapered surfaces 55 of the connecting portion 53. Have been. Therefore, when the coupling portions 53 are inserted into the coupling grooves 73 of the coupling halves 72 to couple the coupling halves 72 together, the coupling portions 5
3 is guided by the tapered surface 55 and the tapered surface 74, and when the connection is completed, as shown in FIG. 2, the intermediate shaft 50 and the extended shaft portion 5c, and furthermore, the roll shaft 5 are aligned so that their axial centers coincide with each other. Is done. In addition, since the end surfaces 54 of the two connecting portions 53 are in perfect contact with each other, there is no gap in the axial direction, and there is a large resistance to the force in the direction away from each other. Does not occur.

As described above, in the roll alignment adjusting device of the present embodiment, the adjusting screw 40, the intermediate shaft 50, and the roll shaft 5 are connected so that no play or gap is generated in the axial direction. The rotation of 50 and the roll shaft 5 is free. Therefore, there is no part that is worn or deformed, so that it can be used for a long period of time.

The above embodiment is a four-roll rolling mill, but the alignment adjusting device of the present invention can be applied to a two-roll rolling mill or a three-roll rolling mill.

[0018]

According to the first aspect of the present invention, the roll shaft can be rotated even if the axial distance is reduced to zero by the thrust bearing incorporated in the free rotation type coupling. Abrasion and deformation with respect to force are eliminated, high reliability is obtained, and play in the axial direction of the roll unit can be eliminated. According to the second aspect of the present invention, the first thrust bearing and the second thrust bearing are fixed to the bearing holder without a gap, and the intermediate shaft is coupled to the adjusting screw without any gap in the axial direction. Since the bearing allows rotation of the intermediate shaft, there is no abrasion or deformation due to the axial force, and the play of the roll unit in the axial direction can be eliminated. According to the third aspect of the present invention, the intermediate shaft is aligned with the roll shaft only by coupling with the half-coupling, so that the assembling work is not required, and the resistance force to separate in the axial direction is extremely large. Without any backlash in the axial direction during operation,
Increases reliability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a roll alignment adjusting device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the alignment adjustment device.

FIG. 3 is an exploded perspective view of the centering type coupling 70. FIG.

FIG. 4 is a front view of a four-roll rolling mill to which the present invention is applied.

FIG. 5 is a front view of the four-roll rolling mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal roll 2 Horizontal roll 3 Vertical roll 4 Vertical roll 5 Roll shaft 40 Adjustment screw 50 Intermediate shaft 53 Both connecting parts 60 Free rotation type coupling 61 First thrust bearing 62 Second thrust bearing 63 Holder body 70 Centering type coupling 71 Half coupling

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Iwahiro Shinkai 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. (No address) Inside the Mizushima Steel Works of Kawasaki Steel Corporation (56) References JP-A-11-57823 (JP, A) JP-A-11-47809 (JP, A) JP-B-4-16243 (JP, B2) JP-B-51-10192 (JP, B1) 10423 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 13/10 B21B 31/18

Claims (3)

(57) [Claims] 1. A plurality of perforated rolls arranged at equal circumferential intervals around a pass line through which a rod or wire passes, and a roll shaft rotatably supporting each of the perforated rolls. In the rolling mill provided with the above, the alignment adjusting device for the grooved roll has an adjusting screw screwed into the casing or a member integral with the casing, and an intermediate shaft for transmitting the screwing operation of the adjusting screw to the roll shaft. A free-rotation coupling that rotatably connects the adjusting screw and one end of the intermediate shaft via a thrust bearing; and an alignment cup that aligns and connects the other end of the intermediate shaft to the roll shaft. A roll alignment adjusting device for a rolling mill, comprising a ring. 2. A free-rotation type coupling, wherein one end of the intermediate shaft is axially separated from a first end of the intermediate shaft.
A thrust bearing and a second thrust bearing;
A bearing holder accommodating the first and second thrust bearings and connecting one end of the intermediate shaft to the adjusting screw; the bearing holder is coupled to an end of the adjusting screw; The holder body contacting the first thrust bearing, and a retainer screwed into the holder body from the intermediate shaft side and having an inner wall surface contacting the second thrust bearing. Roll alignment adjustment device. 3. The coupling according to claim 1, wherein the centering type coupling includes a coupling portion formed at the other end of the intermediate shaft and a coupling portion formed at an end of the roll shaft, and a pair of cups coupling the two coupling portions. Each of the coupling portions has a flat end face that is in contact with each other, and a rear face side thereof is formed as a tapered face. The roll alignment adjusting device according to claim 1, wherein a semi-circular connecting groove is also formed, and both side surfaces of the connecting groove are formed as tapered surfaces.