JPH09192703A - Rolling method for steel bar and wire rod and rolling equipment used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of equipment in a rolling line for steel bars and wire rods. SOLUTION: In this method, a stock for steel bars and wire rods is successively rolled and its area is reduced with 2-roll mill train 100 in which 2-roll mills are continuously arranged in multistage at 90 deg. phase and the finish rolling of the stock is executed with two 4-roll mills S1, S2 which are arranged in the fixed positions of the rearmost stage of the 2-roll mill train 100. When the diameter of a product is small, all stand No.1-No.l6 of the 2-roll mill train and 4-roll mills S1, S2 are operated at high speed and, when the diameter of the product is large, arbitrary stands No.9-No.16 of the poststage of the 2-roll mill train are stopped and the stands No.1-No.8 of the stage preceding the stopped stands and the 4-roll mills S1, S2 are operated at low speed. To change the speed of the 4-roll mills S1, S2, a gear speed-changers are put between rolls and roll driving motors and these changers are switched between the high-speed position and the low-speed position with spline type engaging mechanisms.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rolling steel bars and wire rods and rolling equipment used therefor.

[0002]

2. Description of the Related Art FIG. 8 shows an example of conventional bar steel / wire rod rolling equipment. 101 is a heating furnace, 102 is a row of rough rolling mills, 103
Is an intermediate rolling mill train, 104 is a finishing rolling mill train, and each rolling mill train 102, 103, 104 is a multi-stage two-roll rolling mill train in which two roll mills are alternately arranged horizontally and vertically. The number of stands in this rolling mill train depends on the size of the billet, but is generally 10 or more (20 in the figure). By the way, in recent years
Do not use a 2-roll mill for finish rolling, and use a 4-roll mill for 2
Free-size precision rolling has been proposed in which a finishing rolling mill installed side by side is used to perform precision rolling to a finish size on a stand for the first pass and a stand for the second pass (for example, JP-A-5-38501 and JP-A-6-501). 63601). In the finish rolling mill configured by the 4-roll mill used here, the first stand is a vertical horizontal stand composed of a pair of horizontal rolls and another pair of vertical rolls, and the second stand is a vertical horizontal roll with respect to the vertical horizontal stand. It is a tilt stand that tilts 45 degrees.

In the rolling line as shown in FIG. 8, the finishing dimensions of the steel bars and wire rods are various. For example, there are several types within the range of 16 mm to 85 mm in diameter. Typical examples of the finishing dimensions are 19 mm and 30 mm shown in FIG. , 48 mm, 65 mm, 85 mm, etc. Therefore, when the product diameter is small (for example, 19 mm or 30 m
m) has a large amount of rolling (area reduction), so rolling is performed using all stands and the product is taken from the final stand. When the product diameter is large (for example, 48 mm, 65 mm, 85 mm), the amount of rolling (reduction amount) is reduced. Since the surface area is small, the latter stand is pulled out of the line and the product is taken out from the middle stand. Therefore, when the product diameter is large, the finishing rolling mill 105 composed of a 4-roll mill is moved to the bed of the No. 13 stand (forward fixed position) by the pulling-out device, and the driving device at that position is moved to that position. When connected and the product diameter is small, finishing mill 10
6 is moved to the bed of the No. 17 stand (fixed position in the rear) by the pull-in / pull-out device, connected to the drive device at that position, and the free-size precision rolling as described above is performed. Therefore, a pull-in / draw-out device for moving the finish rolling mills 105, 106 between the front fixed positions and the rear fixed positions is required.

Further, roll driving devices for the front fixed position and the rear fixed position are provided for the finish rolling mills 105 and 106 installed at the front fixed position and the rear fixed position, respectively, but these drive speeds are different from each other. Must be Because the production amount of the whole rolling equipment is fixed, the rolling speed will change if the size of rolling is different. That is, the rolling speed of the large-diameter material is low because the number of used stands is small, and the rolling speed of the small-diameter material is high because the number of used stands is large.

[0005]

As described above, in the conventional rolling equipment, when trying to roll steel bars and wire rods of several kinds of sizes, even in the standard rolling line, the pulling-out / drawing device for pulling in the finish rolling mill is used. Since the roll driving device installed at two fixed positions is required, the equipment cost is high.

In view of the above circumstances, it is an object of the present invention to provide a rolling method and rolling equipment capable of reducing the equipment cost in a bar steel / wire rod rolling line.

[0007]

The rolling method of the present invention comprises two steps.
The bar and wire rod materials are sequentially rolled by the two-roll rolling mill row in which the rolling mills are continuously arranged in multiple stages at 90-degree phase to reduce the surface, and the rolling mill is placed at a fixed position in the last row of the two-roll rolling mill row. It is a method of finish rolling the material with two or more 4-roll rolling mills, and when the product diameter is small, all stands of the 2-roll rolling mill row and the 4-roll rolling mill are operated at high speed, and the product diameter is When the diameter is large, the optional stand at the latter stage of the two-roll rolling mill train is extracted to the outside of the line, and the stand at the preceding stage and the 4-roll rolling mill are operated at a low speed. In the above rolling method, the finish rolling by the two or more four-roll rolling mills is performed by inclining the rolling direction of the second pass by 45 degrees about the pass line with respect to the rolling direction of the first pass.

The rolling equipment of the present invention comprises a two-roll mill 90
A row of two-roll rolling mills continuously arranged in multiple stages in degrees and
It comprises two or more four-roll rolling mills installed at fixed positions at the final stage of the rolling mill train, and the driving rolls of the two or more four-roll rolling mills are connected to a roll driving device via a gear transmission. It is characterized by In the above rolling equipment, the two or more four-roll rolling mills are arranged such that the second-roll four-roll rolling mill is inclined by 45 degrees about the pass line with respect to the first-pass four-roll rolling mill. Further, in the above rolling equipment, the gear transmission includes an input shaft and an output shaft arranged in parallel with each other, and an input side small diameter gear meshed with each other and rotatably held on the input shaft via a bearing. A low-speed gear train consisting of an output-side large-diameter gear fixed to the output shaft, an input-side large-diameter gear meshed with each other and rotatably held on the input shaft via a bearing, and an output-side fixed to the output shaft It is preferable that the high speed gear train including a small diameter gear and a spline type meshing mechanism that selectively connects the input shaft to the input small diameter gear or the input large diameter gear.

According to the rolling method and the rolling equipment of the present invention, the raw material of the steel bar and the wire rod is sequentially rolled by the row of the two-roll rolling mill to reduce the surface, and is rolled from the billet to the stage immediately before the product diameter, and finally. A product is made by finish rolling with two or more 4-roll rolling mills. When the outer diameter of the product is small, it is rolled by all the stands of the two-roll rolling mill row until just before the product diameter, and then finish rolling by the four-roll rolling mill. In this case, since the number of rolling mill stands to be used is large. High-speed rolling is performed, and the 4-roll rolling mill is operated at a high speed by increasing the gear ratio by a gear transmission. When the outer diameter of the product is large, pull out the optional rear stage stand of the two-roll rolling mill row to the outside of the line, and roll to the product diameter just before the stand by the front stage stand that is a part of all stands. In the same manner as above, finish rolling is performed with a 4-roll rolling mill at the latter stage of the rolling line. Further, in this case, since the number of stands of the rolling mill to be used is small, rolling is performed at a low speed, and the 4-roll rolling mill is operated at a low speed by reducing the gear ratio by a gear transmission. In short, according to the present invention, two or more four-roll rolling mills need only be installed at fixed positions at the final stage of the two-roll rolling mill train, and are installed in the middle of the two-roll rolling mill train as in the prior art. You don't have to. Therefore, the number of pull-in / draw-out devices and roll driving devices of the 4-roll rolling mill can be small, and the facility cost can be reduced.

And according to a preferred embodiment of the present invention,
Rolls with the same roll hole diameter are rolled into several sizes of circular cross-section finishing materials by adjusting the roll reduction amount, so several sizes of finishing materials are rolled by one set of finishing mills (two or more 4-roll mills) The advantages are that the number of rolling mills themselves can be reduced, the storage space around the rolling line can be reduced, and the drawing and withdrawing device can be downsized.

Further, according to the gear transmission, the spline type meshing mechanism allows easy and smooth gear shifting and is suitable for transmitting a large power.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of the present invention, in which 101 is a heating furnace, 102 is a row of rough rolling mills, 103 is a row of intermediate rolling mills, and 104 is a row of finish rolling mills. Each rolling mill row 102, 103,
In each of the 104, the two-roll rolling mills are alternately arranged horizontally and vertically at a 90-degree phase to form a two-roll rolling mill train 100. In addition, FIG. 1 is an explanatory diagram showing a stand and a pass shape used when rolling a square billet b having a side of 150 mm to product diameters of 19 mm, 30 mm, 48 mm, 65 mm, and 85 mm, respectively. Number of stands in machine row 100 (20 in the illustration)
The number of stands varies depending on the size of the billet b.

In the present invention, the small diameter and the large diameter of the product diameter are relative, and in the following examples, the product diameters of 19 mm and 30 mm are used.
Are classified into small diameters, and product diameters of 48mm, 65mm, and 85mm are classified into large diameters.
Depending on the size or the like, it is appropriately changed whether it is classified into a small diameter or a large diameter. Anyway, in the example shown in the figure, if the product diameter is small (19 mm, 30 mm), it is a 2-roll rolling mill train.
If all 100 stands (up to No. 16 stand) are used and the product diameter is large, up to No. 10 stand is used for 48 mm, and No. 11 to No. 16 stands are pulled out from the line. Replaced with roller table, 65mm and 85mm No.8
Up to the stands are used, and the No. 9 to No. 16 stands are taken out of the line and replaced with a roller table to form a rolling line. The finish rolling mill 1 consisting of two 4-roll rolling mills S1 and S2 has a fixed position on the bed of the No. 17 stand. No.17 The retracting / drawing device that puts the finishing rolling mill 1 on the bed of the stand is optional, and it may be moved by suspending it with a crane. It is slidably mounted on the rail like a normal housing replacement, hydraulic cylinder, etc. You can slide it with. In this embodiment, the number of four-roll rolling mills is two, but it may be three or more.

The small-diameter products (19 mm, 30 mm) are all stands of the 2-roll rolling mill train 100 and the 4-roll rolling mills S1 and S1.
Rolled at high speed with large diameter products (48mm, 65mm, 85
mm) is the front stage stand (up to No. 10 stand or up to No. 8 stand) of the 2-roll rolling mill row 100 and the 4-roll rolling mill.
S1 and S2 are used for low speed rolling, and the second-stage stand (No. 11 to No. 16 stand or No. 9 to No. 16) of the 2-roll rolling mill train 100 is used.
Stand). As described above, in the rolling method of the present invention, since the finish rolling mill 1 including the four-roll rolling mills S1 and S2 is used only at the fixed position at the last stage of the rolling line, the driving device is installed at one place. One set is sufficient, and the equipment cost can be reduced as compared with the one using two sets as in the prior art of FIG.

In the finish rolling mill 1 described above, it is preferable to dispose the 4-roll rolling mill of the second pass with respect to the 4-roll rolling mill of the first pass with an inclination of 45 degrees about the pass line. And
By adjusting the amount of roll reduction and rolling several sizes of finished material with rolls of the same roll hole diameter, while rolling many sizes of steel bars and wire rods with fewer rolling rolls,
The roundness can be maintained at the same level as the conventional rolling method. Therefore, for example, the finishing of the steel bar in the range of 19 to 85 mm can be finished with one finishing rolling mill. However, after rolling a certain range of sizes, it is necessary to modify the roll die diameter for the next rolling of a larger size.

The finish rolling mill 1 has a large-diameter product,
The transmission speed is switched to obtain a rolling speed corresponding to a product having a small diameter, but it is more preferable to use an electric motor rotation speed control together because an optimum rolling speed corresponding to the product diameter can be obtained.

By the way, when the rolling speed is variable as described above, a transmission is required. Then, the finish rolling mill 1 provided with the gear transmission will be described next with reference to the drawings.
FIG. 2 is a plan view of the finish rolling mill 1 and its roll drive device, and FIG. 3 is a front view of the finish rolling mill 1 as seen from the pass line direction. Figure 2
In No. 3, the finish rolling mill 1 is a four-roll rolling mill in the first pass.
It consists of S1 and second pass 4-roll rolling mill S2. The first-pass 4-roll rolling mill S1 is a vertical stand.
The fourth roll rolling machine S2 of the pass is an inclined stand. The vertical stand S1 comprises a pair of horizontal rolls and a pair of other vertical rolls. The horizontal roll is a drive roll having a drive shaft 3, and the vertical roll is an idler roll. Further, in the tilt stand S2, the roll axis is tilted by 45 degrees with respect to the vertical stand S1, the pair of tilt rolls is a drive roll having the drive shaft 4, and the other pair of tilt rolls is an idler roll. is there. The drive shaft 3 of the vertical stand S1 is connected to the drive motor M1 via the speed reducer 5A, the transmission shaft 6A, the gear transmission 7A, and the transmission shaft 8A, and the drive shaft 4 of the tilt stand S2.
Is connected to a drive motor M2 via a gear box 9, a speed reducer 5B, a transmission shaft 6B, a gear transmission 7B, and a transmission shaft 8B for changing the power transmission direction between oblique, vertical and horizontal. The gear transmissions 7A and 7B are transmissions that change the rotational speeds of the drive motors M1 and M2 and transmit them to the 4-roll rolling machines S1 and S2.

Next, the gear transmission 7A will be described. FIG. 4 is a plan view of the gear transmission 7A, and FIG. 5 is an explanatory view of a shifter. In FIG. 4, reference numeral 11 denotes an input shaft, which is rotatably supported by the machine frame 10 by bearings 12 and 13. An external toothed central spline tooth 14 is formed at the center of the input shaft 11, and bearing portions 15 and 16 are provided on both sides of the central spline tooth 14. The right end 17 in the drawing is a joint portion. The joint portion 17 is connected to the transmission shaft 8A (see FIG. 2) by an appropriate coupling. A small-diameter gear 18 on the input side is rotatably held in the left bearing 15 of the input shaft 11 via a bearing, and a large-diameter gear 19 on the input side is sized on the right bearing 16.
Are rotatably held via bearings. Further, an output shaft 31 is rotatably supported on the machine frame 10 by bearings 32 and 33 in parallel with the input shaft 11, and an output large diameter gear 38 is provided on the left side of the output shaft 31 in the drawing. Output side small diameter gears 39 are fixed to the right side, and a joint portion 37 is provided at the left end in the figure. The joint portion 37 is connected to the transmission shaft 6A (see FIG. 2) by an appropriate coupling. The output large diameter gear 38 meshes with the input small diameter gear 18 (low speed gear train), and the output small diameter gear 39 meshes with the input large diameter gear 19 (high speed gear train).

The following spline meshing mechanism is provided for shifting operation between the high speed gear train and the low speed gear train. External right toothed first spline teeth 18a are integrally formed on the right side surface of the input side small diameter gear 18, and external tooth shaped second spline teeth 19 are formed on the left side surface of the input side large diameter gear 19.
a is integrally formed, and these spline teeth 18
Reference numerals a and 19a have the same pitch circle diameter and tooth profile as those of the central spline tooth 14 of the input shaft 11.

A spline boss 21 having internal tooth-shaped spline teeth is slidably fitted on the outer periphery of the central spline tooth 14 (center position).
Slides to the left side in the drawing to simultaneously mesh with the central spline tooth 14 and the first spline tooth 18a (low speed position), and slides to the right side to simultaneously mesh with the central spline tooth 14 and the second spline tooth 19a. The state (high speed position) can be selectively taken. A shifter 22 is engaged with the outer periphery of the spline boss 21 as shown in FIG.
It is connected to a shift cylinder 25 shown in FIG. 4 via a link 24. By expanding and contracting the shift cylinder 25, the shifter 22 can be operated and the meshing position of the spline boss 21 can be arbitrarily changed. It should be noted that whether or not the shift cylinder 25 is used is arbitrary, and the switching operation may be performed by other power means, or the manual operation may be performed without using the power means.

Therefore, as shown in FIG. 6, when the spline boss 21 is set to the low speed position where it is simultaneously engaged with the central spline tooth 14 and the first spline tooth 18a of the input side small diameter gear 18, it is transmitted from the transmission shaft 8A to the input shaft 11. The rotating torque is
The central spline teeth 14, the input side small diameter gear 18, and the output side large diameter gear 38 are transmitted to be transmitted from the output shaft 31 to the transmission shaft 6A.
Further, as shown in FIG. 7, the spline boss 21 is connected to the central spline tooth 14 and the second spline tooth 19a of the large gear 19 on the input side.
When a high-speed position in which the transmission shaft 8A and the input shaft 11 are simultaneously engaged with each other, the rotational torque transmitted to the input shaft 11 from the transmission shaft 8A is
It is transmitted to the input-side large-diameter gear 19 and the output-side small-diameter gear 39 to be transmitted from the output shaft 31 to the transmission shaft 6A. Of course, the former (FIG. 6) is slower and the latter (FIG. 7) is faster. Therefore, when the product diameter is small, it is preferable to switch to high speed as shown in FIG. 7, and when the product diameter is large, to switch to low speed as shown in FIG.

The above-described gear transmission 7A is for the vertical stand S1 shown in FIG. 2, but it is for the tilt stand S2.
Also, substantially the same configuration can be adopted. However, as shown in FIG. 2, the input shaft 8B and the output shaft of the gear transmission 7B are
When the center-to-center distance between 6B is large, it is preferable to insert an idle gear 40 between them to transmit torque. That is, the idle gear 40 is inserted between the large diameter gear 19 on the input side and the small diameter gear 39 on the output side, and the small diameter gear 18 on the input side and the large diameter gear 38 on the output side are inserted.
The idle gear 40 is also inserted between and. Even in this case, the spline type meshing mechanism and the shift mechanism on the input shaft can be configured substantially the same as in FIG. The gear transmissions 7A and 7B described above are preferable for shifting the rolling speed of the rolling mill because they can reliably transmit a large drive torque and can easily shift gears.

[0023]

According to the present invention, since only one set of the pull-in / pull-out device and the roll driving device of the finish rolling mill consisting of the four-roll rolling mill in the rolling line is sufficient, the equipment cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a rolling method of the present invention.

FIG. 2 is a plan view of the finish rolling mill 1 and its gear transmission.

FIG. 3 is a front view of the rolling equipment of FIG. 2 as viewed from the pass line direction.

FIG. 4 is a plan view of a gear transmission 7A.

FIG. 5 is an explanatory diagram of a shift mechanism.

FIG. 6 is a plan view of the low speed shift state of the gear transmission 7A.

FIG. 7 is a plan view of the gear transmission 7A in a high speed switching state.

FIG. 8 is a conceptual diagram of a conventional rolling method.

[Explanation of symbols]

1 Finishing mill S1 Vertical stand S2
Tilt stand 7A Gear transmission 7B Gear transmission 11
Input shaft 14 Center spline tooth 18 Small gear on input side 19
Large gear on input side 21 Spline boss 22 Shifter 25
Shift cylinder 31 Output shaft 38 Large gear on output side 39
Output small gear

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B21B 37/00 BBG 9154-4E B21B 37/00 BBG (72) Inventor Takahiro Komiya Sokai, Niihama, Ehime Prefecture 5-2 Machi Sumitomo Heavy Industries Machinery Co., Ltd. Niihama Works (72) Inventor Hidenori Kondo 1-chome, Mizushima Kawasaki Dori, Kurashiki City, Okayama Prefecture (No house number) Kawasaki Steel Co., Ltd. Mizushima Works (72) Inventor Ryo Takeda Okayama 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Japan (without street number) Kawasaki Steel Works Mizushima Works

Claims (3)

[Claims] 1. A two-roll rolling mill train in which two-roll rolling mills are continuously arranged in multiple stages of 90 degrees phase to sequentially roll and reduce the material of a steel bar and wire rod, and the last stage of the two-roll rolling mill train. Is a method of finishing rolling the material with two or more 4-roll rolling mills arranged at fixed positions. When the product diameter is small, all stands of the 2-roll rolling mill and the 4-roll rolling machine are operated at high speed. When the product is operated and the product diameter is large, it is characterized in that an arbitrary rear stand of the two-roll rolling mill row is pulled out of the line, and the front stand and the four-roll rolling mill are operated at a low speed. Rolling method for steel bars and wire rods. 2. A two-roll rolling mill train in which two-roll rolling mills are continuously arranged in multiple stages at 90-degree phases, and two or more four-roll rolling mills installed at fixed positions at the final stage of the two-roll rolling mill train. And a driving roll of the two four-roll rolling mills is connected to a roll driving device via a gear transmission. 3. The gear transmission includes an input shaft and an output shaft, which are arranged in parallel with each other, and an input-side small-diameter gear and an output shaft, which are meshed with each other and rotatably held by a bearing on the input shaft. A low-speed gear train consisting of a fixed output-side large-diameter gear, an input-side large-diameter gear meshed with each other and rotatably held on the input shaft via a bearing, and an output-side small-diameter gear fixed to the output shaft. And a high-speed gear train and a spline type meshing mechanism for selectively coupling the input shaft to a small gear on the input side or a large gear on the input side. .