JP2567750Y2 - Finishing mill - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finishing mill. More specifically, the present invention relates to a finish rolling mill for precision rolling bar and wire rods.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a bar and wire rod rolling facility. 101 is a heating furnace, 102 is a row of rough rolling mills, 103
Denotes an intermediate rolling mill row, 104 denotes a finishing rolling mill row, and each of the rolling mill rows 102, 103, and 104 has a two-roll mill alternately arranged horizontally and vertically.

In recent years, a two-roll mill is not used for finish rolling, but two stands of four-roll rolling mills are installed. A large rolling reduction is performed by a first-pass rolling mill, free-size rolling is performed, and a finish rolling is performed by a second-pass rolling mill. That is being considered. The finishing mill used in this case has the first stand as shown in FIG.
And the second stand is an inclined stand S2 in which the rolls are inclined at 45 degrees with respect to the vertical stand S2 shown in FIG. The vertical and horizontal stand S1 includes a pair of horizontal rolls and another pair of vertical rolls. The horizontal roll is a drive roll having a drive shaft 7, and the vertical roll is an idler roll. Also, the tilt stand S2
Is a drive roll having a pair of inclined rolls having a drive shaft 7, and the other pair of inclined rolls is an idler roll.

[0004]

When the above-mentioned four-roll finishing rolling mill train is retrofitted to an existing rolling equipment as shown in FIG. 7, the vertical and horizontal stand S1 of the first stand is, as shown in FIG. Since the drive shaft 7 of the horizontal roll can be connected to the existing drive reducer 51 and drive spindle 52 for the horizontal two-roll mill by the universal coupling 53, there is no problem in remodeling. However, when the power source is connected to the drive shaft 7 of the inclined roll in the inclined stand S2 of the second stand, the equipment must be considerably bulky. That is, as shown in FIG. 6, using a complicated gear train 54, the power transmission shaft must be changed from horizontal to vertical and obliquely,
This is because power cannot be transmitted to the drive shaft 7 inclined from 1. Therefore, in this case, the equipment cost is high and the maintenance is not easy.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a finishing mill that can be easily retrofitted to existing rolling equipment, has low equipment costs, and is easy to maintain.

[0006]

The finishing mill according to the present invention comprises:
A finishing mill for precision rolling of steel bars and wires, comprising two stands of four roll mills, the first stand of the first pass comprises a pair of horizontal rolls and another pair of vertical rolls, and the horizontal rolls are universal. A drive roll having a drive shaft having a shaft end connected to the coupling, wherein the vertical roll is an idler roll, and
The stand is a stand in which the roll axis is inclined by 45 degrees with respect to the first stand, a pair of rolls is a drive roll having a drive shaft, and the other pair of inclined rolls is an idler roll, A drive motor is directly connected to the drive shaft of the drive roll of the stand .
One stand and the second stand share a common unit base.
And the unit base is orthogonal to the rolling line
It is mounted on a rolling mill base that moves in and out from the direction .

[0007]

According to the present invention, since the drive motor is directly connected to the inclined drive roll of the second stand, it is not necessary to take power from the drive source of the rolling equipment. The existing spindle can be directly connected to the horizontal drive roll of the first stand.
To the rolling line through the mill base
Disconnect from existing drive source by taking in and out from direction
can do. Therefore, it is necessary to add a complicated gear train
Since a simple remodeling is not required, the refining of the existing rolling equipment is easy, and a finishing mill with low facility cost and easy maintenance can be obtained.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. First, the basic configuration of the four-roll mill will be described with reference to FIG. 1, 1 is a pair of horizontal rolls, bearings 3, 3
Through the casing 5. The horizontal rolls 1, 1 have drive shafts 7, 7, which are connected to a drive spindle (not shown), and serve as drive rolls. 2,
Reference numeral 2 denotes a pair of vertical rolls, which are supported by bearings 4 and 4 on a pair of idler roll brackets 6 and 6, respectively. Further, a sector gear 8 for adjusting the amount of reduction is mounted on the bearing 4 of the vertical rolls 2 and 2. When this sector gear 8 is pushed and pulled by the rack 9 and rotated, an eccentric sleeve (not shown) in the bearing 4 is rotated. A known rolling adjustment mechanism is provided to adjust the rolling reduction. The above is a four-roll mill arranged vertically and horizontally, but in the case of an inclined stand, the roll axis is only inclined by 45 degrees as a whole with respect to that of FIG. 4, and the other configurations are substantially the same. You can think.

Next, the finishing mill according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view of the finishing mill, FIG. 2 is a front view of the finishing mill, and FIG. 3 is a view taken along line III in FIG. As shown in FIG. 3, the drive roll 1 of the tilt stand S2
A hydraulic motor 11 is connected via a transmission shaft 12 to a drive shaft 7 extending from the
It is designed to be directly rotated by the driving force. Since the other pair of rolls are idler rolls as described above, there is no need to connect them to the driving device. The hydraulic motor 1
1 may be connected directly to a hydraulic source by a hose, or may be connected using an automatic fluid coupling.

As shown in FIGS. 1 and 2, the inclined stand (second stand) S2 and the vertical and horizontal stand (first stand)
S1 is mounted on a common unit base 20, which enters and exits the rolling line from a direction perpendicular to the rolling line.
On the rolling mill base 21. The illustrated example is of a type that is suspended by a crane and mounted on the rolling mill base 21, but may be of a type that can be automatically mounted as in a normal housing exchange. The drive shaft 7 of the first stand S1 is connected to the universal coupling 53 and to a drive reducer as shown in FIG.

In the finishing mill shown in FIGS.
The material rolled on the stand S1 is sent to the second stand S2, where it is rolled by a drive roll and an idler roll driven by the hydraulic motor 11 of the second stand S2, and comes out as a product. In this case, the rotation speed of the hydraulic motor 11 may be set to a rotation speed determined on a rolling pass schedule. The two hydraulic motors 11 are hydraulically operated in synchronization with each other. However, if the drive rolls 1 and 1 are driven at a rotation speed slightly lower than the moving speed of the rolling material, both rolls can be driven. 1, 1 are pushed around through the rolling material and are driven synchronously.

During rolling, the first stand S1 and the second stand S2 depend on the set rotation speed of the hydraulic motor 11.
And a compression force are generated between them, but the rolling accuracy is not affected. Therefore, the rotation speed control of the hydraulic motor 11 does not need to be maintained at a predetermined rotation speed by feedback control, and there is no need to use a servo valve or the like for the hydraulic unit, so that there is an advantage that inexpensive equipment is provided.

In the above-mentioned finishing mill, the required torque and the number of revolutions vary depending on the rolling size. Therefore, it is necessary to replace the hydraulic motor 11 with a hydraulic motor having a different specification as required. Although the hydraulic motor is used in the above embodiment, an electric motor may be used instead.

Depending on the rolling size (especially the large diameter size), all four rolls of the second stand S2 may not be driven, and the indentation rolling by the driving roll of the first stand S1 may be used. In this case, Since the tail end of the rolled material remains in the second stand S2, the second stand S
It is preferable that the two pairs of rolls 1 are driven by the hydraulic motor 11.

[0015]

According to the present invention, since a complicated gear train is not required, it is easy to modify existing rolling equipment, and it is possible to obtain a finishing mill in which equipment cost is low and maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a plan view of a finishing mill according to an embodiment of the present invention.

FIG. 2 is a front view of the finishing mill shown in FIG.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a longitudinal sectional view of a four-roll mill.

FIG. 5 is a side view of the vertical / horizontal stand S1 and its driving device.

FIG. 6 is a side view showing an inclined stand S2 and a conventional driving device used for the same.

FIG. 7 is a block diagram of a conventional rolling facility.

[Explanation of symbols]

S1 Vertical and horizontal stand (first stand) S2 Inclined stand (second stand) 1 drive roll 2 idler roll 7 drive shaft 11 hydraulic motor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Norio Kunida 5-2, Sokai-cho, Niihama-city, Ehime Prefecture Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Works (72) Inventor Takeshi Tange 5-2, Sokai-cho, Niihama-shi, Ehime No. Sumitomo Heavy Industries, Ltd. Niihama Works (56) References JP-A-50-140354 (JP, A) JP-A-63-168202 (JP, A) JP-A-58-196108 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A finishing mill for precision rolling of steel bars and wires, comprising two stands of four roll mills, wherein the first stand in the first pass comprises a pair of horizontal rolls and another pair of vertical rolls, A drive roll having a drive shaft having a shaft end in which the horizontal roll is connected to a universal coupling, wherein the vertical roll is an idler roll, and a second stand in a second pass is rolled with respect to the first stand. A stand whose axis is inclined by 45 degrees, a pair of rolls is a drive roll having a drive shaft, another pair of inclined rolls is an idler roll, and a drive shaft of the drive roll of the inclined stand is driven. Motor is directly connected, and the first stand and the second stand share a common unit.
On a rolling base
Is mounted on the base for the rolling mill that enters and retracts from the orthogonal direction.
Mill finish, characterized in that is.