JPH073802U - Finish rolling machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a finishing rolling mill in which existing rolling equipment can be easily modified, the equipment cost is low, and maintenance is easy. [Structure] Two stands of a four-roll mill, the first stand S1 of the first pass consists of a pair of horizontal rolls and a pair of other vertical rolls, and the horizontal rolls are connected to a universal coupling by a shaft end portion. A drive roll having a drive shaft 7 having the vertical roll is an idler roll, and a second stand S2 of the second pass is an inclined stand having a roll axis inclined by 45 degrees with respect to the first stand S1. The roll is a drive roll having a drive shaft, and the other pair of tilt rolls is an idler roll, and a drive hydraulic motor 11 is directly connected to the drive shaft 7 of the tilt drive roll 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a finish rolling mill. More specifically, it relates to a finish rolling machine for precision rolling of steel bars and wire rods.

[0002]

[Prior art]

 FIG. 7 shows an example of a bar steel / wire rod rolling facility. 101 is a heating furnace, 102 is a row of rough rolling mills, 103 is a row of intermediate rolling mills, 104 is a row of finishing rolling mills, and each rolling mill row 102, 103, 104 is a two-roll mill alternately arranged horizontally and vertically. Is.

By the way, in recent years, two-roll mills are not used for finish rolling, two stands of four-roll rolling mills are installed, a large reduction is made by the rolling mill of the first pass and free-size rolling is performed, and finish rolling is performed by the rolling mill of the second pass. Is being considered. In the finish rolling mill used in this case, the first stand is a vertical stand S1 shown in FIG. 5, and the second stand is an inclined stand S2 in which the roll is tilted 45 degrees with respect to the vertical stand S2 shown in FIG. is there. The vertical horizontal stand S1 is composed of a pair of horizontal rolls and a pair of other vertical rolls. The horizontal roll is a drive roll having a drive shaft 7, and the vertical roll is an idler roll. Further, in the tilt stand S2, the pair of tilt rolls are drive rolls having the drive shaft 7, and the other pair of tilt rolls are idler rolls.

[0004]

[Problems to be solved by the device]

 When the above-mentioned 4-roll finishing rolling mill train is modified and installed in the existing rolling equipment as shown in Fig. 7, the vertical horizontal stand S1 of the first stand has the horizontal roll drive shaft 7 as shown in Fig. 5. Since it can be connected to the drive reducer 51 and the drive spindle 52 for the horizontal two-roll mill by the universal coupling 53, there is no problem in modification. However, in case of connecting the power source to the drive shaft 7 of the tilt roll, the tilt stand S2 of the second stand is inevitably a bulky facility. That is, as shown in FIG. 6, a complex gear train 54 is used to transmit power from the reducer 51 to the inclined drive shaft 7 unless the power transmission shaft is changed from horizontal to vertical and diagonally. Because you can't. Therefore, in this case, the equipment cost is high and maintenance is not easy.

In view of such circumstances, it is an object of the present invention to provide a finishing rolling mill that can be easily retrofitted into an existing rolling mill, has a low equipment cost, and is easy to maintain.

[0006]

[Means for Solving the Problems]

 The finish rolling mill of the present invention is a finish rolling mill for precision rolling of steel bars and wire rods, which comprises two stands of a four-roll mill, the first stand of the first pass is a pair of horizontal rolls and a pair of other vertical rolls. The horizontal roll is a drive roll having a drive shaft having a shaft end portion connected to a universal coupling, the vertical roll is an idler roll, and the second stand of the second pass is the first roll. In the stand in which the roll axis is inclined by 45 degrees with respect to one stand, the 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.

[0007]

[Action]

 According to the present invention, since the drive motor is directly connected to the tilt drive roll of the second stand, it is not necessary to take power from the drive source of the rolling equipment. Moreover, since the existing spindle can be directly connected to the horizontal drive roll of the first stand, there is no problem in modification. Therefore, since a complicated gear train is not required, it is possible to easily modify the existing rolling mill, obtain a finishing mill with low facility cost and easy maintenance.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. First, the basic configuration of the 4-roll mill will be described with reference to FIG. Reference numerals 1 and 1 denote a pair of horizontal rolls, which are axially supported by a casing 5 via bearings 3 and 3. Further, the horizontal rolls 1, 1 have drive shafts 7, 7 that are connected to a drive spindle (not shown), and serve as drive rolls. A pair of vertical rolls 2 and 2 are axially supported by a pair of idler roll brackets 6 and 6 via bearings 4 and 4, respectively. In addition, the bearing 4 of the vertical rolls 2 and 2 is provided with a sector gear 8 for adjusting the reduction amount, and when this is pushed and pulled by a rack 9 and rotated, an eccentric sleeve (not shown) in the bearing 4 is attached. A known reduction adjusting mechanism that rotates to adjust the reduction amount is provided. Note that the above is a vertical 4-roll mill, but in the case of the tilt stand, the roll axis is tilted at 45 degrees with respect to the one in Fig. 4, and the other configurations are substantially the same. You can think.

Next, the finish rolling mill of the present invention will be described with reference to FIGS. 1 is a plan view of the finish rolling mill, FIG. 2 is a front view of the finish rolling mill, and FIG. 3 is a view taken along the line III in FIG. As shown in FIG. 3, a hydraulic motor 11 is connected to a drive shaft 7 extending from the drive roll 1 of the tilt stand S2 via a transmission shaft 12, and the drive roll 1 is directly rotated by the drive force of the hydraulic motor 11. It is supposed to be done. Since the other pair of rolls are idler rolls as described above, they need not be connected to the drive unit. The hydraulic motor 11 described above may be directly connected to the hydraulic power source by a hose, or may be connected by using a fluid automatic coupling.

As shown in FIGS. 1 and 2, the tilt stand (second stand) S2 and the vertical stand (first stand) S1 are mounted on a common unit base 20, and the unit base 20 is a rolling mill. Mounted on the base 21. The illustrated example is a type that is hung by a crane and placed on the base 21 for the rolling mill, but it may be a type that can be automatically placed like a normal housing replacement. The drive shaft 7 of the first stand S1 is connected to the universal coupling 53 and is connected to the drive reducer as shown in FIG.

In the finish rolling mill shown in FIGS. 1 to 3, the material rolled by the first stand S1 is sent to the second stand S2 and driven by the hydraulic motor 11 of the second stand S2 and the idler roll. It is rolled in and comes out as a product. In this case, the rotation speed of the hydraulic motor 11 may be set to the rotation speed determined by the rolling pass schedule. The two hydraulic motors 11 are hydraulically operated synchronously, but if the drive rolls 1 and 1 are driven at a rotational speed slightly slower than the moving speed of the rolling material, both rolls can be driven. 1,1 are pushed around through the rolling material and driven synchronously.

During rolling, tension or compression force is generated between the first stand S1 and the second stand S2 depending on the set rotation speed of the hydraulic motor 11, but this does not affect the rolling accuracy. . 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 it is not necessary to use a servo valve or the like for the hydraulic unit, which is an advantage that the equipment is inexpensive.

In the above finish rolling mill, the required torque and the number of rotations change depending on the rolling size, so that the hydraulic motor 11 needs to be replaced with a hydraulic motor having a different specification as needed. Further, although the hydraulic motor is used in the above embodiment, an electric motor may be used instead.

Depending on the rolling size (especially large diameter size), all four rolls of the second stand S2 may be non-driving, and indent rolling may be performed by the driving roll of the first stand S1. In this case, since the tail end of the rolled material remains on the second stand S2, it is preferable to drive the pair of rolls 1 of the very second stand S2 of the present invention by the hydraulic motor 11.

[0015]

[Effect of device]

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

[Brief description of drawings]

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

2 is a front view of the finish rolling mill shown in FIG. 1. FIG.

FIG. 3 is a view taken along the line III in FIG.

FIG. 4 is a vertical sectional view of a 4-roll mill.

FIG. 5 is a side view of a vertical stand S1 and its drive device.

FIG. 6 is a side view showing a tilt stand S2 and a conventional drive device used for the tilt stand S2.

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

[Explanation of symbols]

S1 Vertical stand (1st stand) S2 Tilt stand (2nd stand) 1 Drive roll 2 Idler roll 7 Drive shaft 11 Hydraulic motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidenori Kondo, Hidenori Kondo 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Norio Kunida 5 Sokai-cho, Niihama City, Ehime Prefecture No. 2 Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Factory (72) Inventor Takeshi Tange 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Factory

Claims (1)

[Scope of utility model registration request] 1. A finish rolling machine for precision rolling of steel bars and wire rods, comprising two stands of a 4-roll mill, wherein the first stand of the first pass comprises a pair of horizontal rolls and a pair of other vertical rolls. The horizontal roll is a drive roll having a drive shaft having a shaft end connected to a universal coupling, the vertical roll is an idler roll, and the second stand of the second pass is a roll with respect to the first stand. The shaft is a stand inclined by 45 degrees, the pair of rolls is a drive roll having a drive shaft, the other pair of tilt rolls is an idler roll, and the drive shaft of the drive roll of the tilt stand is driven. A finishing rolling mill characterized by being directly connected to a motor.