JPH09192709A - Method for grinding roll of four-roll mill, four-roll mill and roll cutting equipment used in the same method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and sure method by which a roll is rotated for grinding even when the roll is a nondriven roll without a driving shaft. SOLUTION: When the driving rolls 1, 1 of a four-roll mill are cut, by connecting the roll driving shafts of a roll driving device to the driving shafts 5 of the driven rolls, the driven rolls 1, 1 are rotated and the surfaces of the rolls are cut with cutting machine. When the nondriven rolls 2, 2 are cut, driving gears of the roll driving devices are engaged with driven gears 16 on the side faces of the nondriven rolls 2, 2, the non-driven rolls 2, 2 are rotated by revolving the driving gears and the roll surfaces are cut with the cutting machine. The driving gear is projected from one end of a gear box which is mounted in a slide unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll cutting method for a 4-roll mill, a 4-roll mill used for the method, and roll cutting equipment. A rolling mill used for rolling steel bars, wire rods or the like needs to cut the roll surface to correct the deformation when the roll is worn. The present invention relates to a roll cutting technique in such a case.

[0002]

2. Description of the Related Art When re-cutting a roll, disassembling the rolling mill, pulling out the roll, setting it on a large lathe, and cutting it will be very troublesome and reduce the operating rate of the rolling line. . Therefore, a method and an apparatus for re-cutting a roll without disassembling the rolling mill is disclosed in JP-A-63-
It is proposed in Japanese Patent No. 237801 and Japanese Patent Laid-Open No. 104404/1989. In the above-mentioned conventional example, a housing accommodating a pair of drive rolls (that is, a two-roll mill) is extracted from a rolling line, set on a cutting machine, and a roll drive device is connected to a drive shaft of the drive roll to rotate the roll, The cutting tool bit cuts the roll surface. When the cutting of one drive roll is completed, the cutting of the other drive roll is performed in the same procedure.

[0003]

By the way, the present applicants have proposed to carry out rolling by a 4-roll mill twice and perform precision rolling in a free size. The 4-roll mill used for this purpose is the first pass. In both the vertical stand and the second-pass tilt stand, the pair of rolls is a drive roll, and the other pair of rolls is a non-drive roll. However, if the roll has a drive shaft as in the conventional example, it is possible to rotate the two rolls by connecting the roll drive device.
If the rolling mill has a non-driving roll that does not have a driving shaft, such as the four-roll mill, the non-driving roll cannot be rotated. In this case, if the non-driving roll is pulled out from the housing and is to be cut, it takes time and labor as described above, and the operating rate of the rolling line is reduced.

In view of such circumstances, it is an object of the present invention to provide a simple and reliable method which can rotate even a non-driving roll having no drive shaft for cutting. To do. Another object of the present invention is to provide a 4-roll mill and roll cutting equipment suitable for carrying out the cutting method.

[0005]

The roll cutting method of the present invention is a roll cutting method for a 4-roll mill having a pair of driving rolls and another pair of non-driving rolls, and the 4-roll mill is extracted from a rolling line. Installed at the cutting position of the roll cutting equipment, and when cutting the drive roll of the 4-roll mill, the roll drive shaft of the roll drive device is connected to the drive shaft of the drive roll to rotate the drive roll,
When the roll surface of the drive roll is cut with a cutting machine and the non-drive roll of the 4-roll mill is cut, the drive gear of the roll drive device is engaged with the driven gear mounted on the side surface of the non-drive roll. The non-driving roll is rotated by rotating the driving gear, and the roll surface of the non-driving roll is cut by a cutting machine.

The four-roll mill of the present invention comprises a pair of drive rolls having a drive shaft and a pair of other non-drive rolls having no drive shaft. The pair of drive rolls are provided in the upper casing and the lower casing, respectively. The pair of non-driving rolls are rotatably supported, and each of the pair of non-driving rolls is rotatably supported by a pair of idler roll brackets connected to an intermediate casing between the upper casing and the lower casing. Is provided with a driven gear for transmitting a rotation torque to the non-driving roll, and the idler roll bracket meshes with the driven gear,
It is characterized in that a space is formed to allow the drive gear for rotating it to enter.

The roll cutting equipment of the present invention is a cutting machine having a bed on which a 4-roll mill for cutting rolls is installed, and a cutting tool which can be moved toward and away from the 4-roll mill on the bed, and which has a cutting tool for cutting the roll surface. And a first roll driving device and a second roll driving device whose position can be freely changed between a working position for rotationally driving the rolls of the four-roll mill on the bed and a retracted position distant therefrom. The roll driving device is connected to a driving shaft of a driving roll of a four-roll mill, and has a driving roll rotating unit for rotating the driving shaft and a power source thereof, and a driven roll of one non-driving roll of the four-roll mill. A non-driving roll rotating unit having a driving gear that meshes with and rotates the working gear, wherein the second roll driving device is a four-roll mill. Meshes with the square of the driven gear of the non-driven rolls, characterized in that it comprises a non-driven roll rotation unit with a driving gear to rotate it. The non-driving roll rotation unit in the roll cutting equipment of the present invention is a slide unit on the base frame,
A gear box mounted on the slide unit, the gear box including a drive gear protruding from the tip thereof, a drive motor, and a gear train for transmitting the power of the drive motor to the drive gear. It is preferable to have. Further, the gear box of the non-driving roll rotation unit has a contact plate that is brought into contact with the end surface of the idler roll bracket of the 4-roll mill, and a screw rod that connects the box body of the gear box to the idler roll bracket. preferable.

According to the cutting method of the present invention, even in a four-roll mill having a non-driving roll, the driven gear provided on the side surface of the non-driving roll is meshed with the driving gear of the roll driving device, When the driving gear is rotated, the driven gear rotates and the non-driving roll also rotates. Therefore, the surface of the driven roll can be cut by the cutting machine. Therefore, it is not necessary to disassemble the mill housing and take out the non-driving roll from the mill housing, so that the roll cutting in the 4-roll mill can be easily and quickly performed.

In the four-roll mill of the present invention, the driven gear is attached to the side surface of the non-driving roll, and the driving gear that meshes with the driven gear is inserted into the space formed in the idler roll bracket. Because you can
The roll cutting method of the present invention enables roll cutting.

According to the roll cutting equipment of the present invention, the 4-roll mill for cutting the rolls is installed on the bed, the first roll driving device is set at the working position, and the roll driving shaft is the driving shaft of the 4-roll mill. Since the drive roll rotates when it is connected to and rotated, the surface of the drive roll can be cut by the cutting machine. Further, the first and second roll driving devices were set to the work position, the driving gears of the respective non-driving roll rotating units were made to enter the space of the idler roll bracket, and fixed to the side faces of the pair of non-driving rolls. When the gears to be driven are respectively engaged and rotated, the non-driving roll rotates, so that the surface of the non-driving roll can be cut by the cutting machine. In this way, according to the roll cutting equipment of the present invention, the roll surface of both the driven roll and the non-driven roll can be cut on the bed, so that the roll cutting can be performed efficiently. Since the non-driving roll rotating unit according to a preferred embodiment of the present invention has a gear box in which a driving gear is projected on a slide unit that reciprocates on a base frame, it is installed on a bed of a roll cutting facility. The drive gear of the gearbox can be inserted into the space formed in the idler roll bracket of the 4-roll mill, which is suitable for carrying out the roll cutting method of the present invention. According to the gear box which is a preferred embodiment of the present invention, if the position of the contact plate with respect to the gear box is provided at a position where the driven gear of the non-drive roll rotation unit meshes with the driven gear in the 4-roll mill, the idler By moving the slide unit forward until the contact plate comes into contact with the end surface of the roll bracket, the driving gear can be easily and surely engaged with the driving gear, so that the cutting preparation work can be easily performed.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a 4-roll mill according to an embodiment of the present invention. 1, 1 are a pair of drive rolls, 2 and 2 are a pair of non-drive rolls, and a total of four rolls are provided. The drive rolls 1 and 1 have horizontal support shafts 3 and 3, and drive shafts 5 and 5 integrally connected to the support shafts 3 and extending in the lateral direction. The support shafts 3, 3 are bearings 7,
The upper casing 11 and the lower casing 12 are axially supported via the shaft 7, respectively, and the upper casing 11 and the lower casing 12 are firmly connected to the intermediate casing 13 by studs or the like. Further, the tip end of the drive shaft 5 is connected to a roll line roll drive device and a drive roll rotation unit 40 at the time of roll cutting, which will be described later, via a joint portion 5a.

A pair of left and right idler roll brackets 15 are connected to the intermediate casing 13 with studs or the like. The non-driving rolls 2 and 2 have vertical support shafts 4 and 4, and the support shafts 4 and 4 are supported by left and right idler roll brackets 15 and 15, respectively. And the support shaft 4,
A roll sleeve 6 is fitted around the outer circumference of the roll sleeve 4 via a bearing, and the non-driving roll 2 is mounted on the outer circumference of the roll sleeve 6.
Is fitted.

A driven gear 16 is provided on the side surface on the upper surface side of the non-driving roll 2 which is rotatably supported by the idler roll bracket 15. This driven gear 16 is designed to be inserted in a narrow space and to receive a large rotational torque by meshing with a driving gear to be described later that is inserted from the outside in the radial direction. A spur gear that does not generate is preferable.

The non-driving roll 2 is fitted in the roll sleeve 6 with a key, and the driven gear 16 is also fitted in the roll sleeve 6 with a key, and torque transmission is performed by the key. . In the present invention, as long as torque can be transmitted from the driven gear 16 to the non-driving roll 2, the driven gear 16 is not limited to the above configuration, and the driven gear 16 is bolted to the side surface of the non-driving roll 2, for example. Arbitrary means such as fixing by means of the like can be adopted. The phrase "a driven gear is provided on the side surface of the non-driving roll to transmit a rotational torque to the non-driving roll" in the claims should be broadly construed to the above meaning.

A space 17 is formed in the idler roll bracket 15 to allow a driving gear 54, which will be described later, to approach the driven gear 16 from the outside of the non-driving roll 2. Further, a pre-drive spray 18 and a roll cooling spray 19 are attached to the outer end portion of the idler roll bracket 15, but these are removable.

FIG. 2 is a plan view of roll cutting equipment according to an embodiment of the present invention. In FIG. 2, 20 is a cutting machine,
Reference numeral 31 is a first roll driving device, 32 is a second roll driving device, and M is a 4-roll mill installed on the bed. The cutting machine 20 can slide on a rail 21 to move closer to and away from the 4-roll mill M on the bed, and can slide on a rail 22 orthogonal to the approaching / separating direction to traverse. The first roll driving device 31 is a slide base
The drive roll rotation unit 40 and the non-drive roll rotation unit 50 are mounted on the 33.
It reciprocates above. The position shown in the drawing is a retracted position and can be brought to a work position where each roll of the 4-roll mill M is rotated by traveling to the left in the drawing. The second roll driving device 32 has only the non-driving roll rotating unit 50 mounted on the slide base 35.
The 35 is adapted to reciprocate on the rail 36. The position shown in the drawing is a retracted position and can be brought to the working position where the non-driving rolls of the 4-roll mill are rotated by traveling to the right in the drawing.

FIG. 3 is an enlarged view taken along the line III--III in FIG. 2. As shown in FIG. 3, the cutting machine 20 has a cutting tool 23 for cutting a roll, and the cutting tool 23 is moved up and down. It has a lifting device 24 composed of a cylinder with a position detector for vertical positioning, a ball screw screw driven by an AC servomotor, and the like. 37 is a bed on which the 4-roll mill M is installed. The 4-roll mill M is firmly fixed so that chattering etc. does not occur during cutting, and it fits with the reference seat etc. of the 4-roll mill M for accurate positioning. Preferred are

The drive roll rotation unit 40 is a roll drive shaft 4 having two upper and lower stages rotatably supported by the slide base 33.
1 and 42 and drive motors 43 and 44 for the roll drive shafts 41 and 42, respectively. The non-driving roll rotation unit 50 is mounted on the same slide base 33, the details of which will be described later.

FIG. 4 is a partially enlarged sectional view of the drive roll rotating unit 40. Roll drive shafts 41 and 42 are both main shafts
45 and a coupling 46 that is slidably engaged with the tip of the main shaft 45 by a spline or the like so as to rotate integrally.
And a pulley 47 fixed to the other end of the main shaft 45 so that the belt 48 or the like receives the torque of the drive motor 43 (44). The coupling 46 of the upper roll drive shaft 41 is a joint portion 5a of the drive shaft 5 of the 4-roll mill installed on the bed.
Shows the state in which they are not coupled to each other, and shows the state in which the coupling 46 of the lower roll drive shaft 42 is coupled. The coupling 46 can be slid manually or by any sliding mechanism.

FIG. 5 shows the non-driving roll rotating unit 50 of the first roll driving device 31 and the non-driving roll rotating unit 50 of the second roll driving device 32. Since the non-driving roll rotation unit 50 of both of them has substantially the same configuration, they will be described below without distinction.

On the slide bases 33 and 35, the rail 3 is provided.
A slide unit 51 that reciprocates in a direction orthogonal to 4, 36 (see FIG. 2) is mounted, and a gear box 53 is attached to an upper frame 52 thereof. The slide unit 51 is a manual type, but may be an automatic type that slides with an air cylinder or the like. The gear box 53 is provided with a drive gear 54 protruding from the front end surface thereof and a drive motor 55 thereof.

Details of the gear box 53 will be described with reference to FIGS. 7 is a partial sectional side view of the gear box 53, and FIG. 8 is a plan view of the gear box 53. The gear box 53 has a box body 53a, and the drive gear 54, which is a spur gear, is attached to a support shaft 56 at the tip thereof.
Is installed. As described above, more than half of the drive gear 54 projects from the tip of the box 53a. And
An idle gear 59 meshes between the transmission gear 57 fixed to the support shaft 56 and the transmission gear 58 fixed to the support shaft of the drive motor 55. The torque of the drive motor 55 is transmitted to the drive gear 54 by the gear train.

Reference numeral 60 shown in FIG. 8 is a contact plate. This contact plate 60 is attached to the tip of the box 53a and has an appropriate thickness.
By using 60, the driving gear 54 and the driven gear 16
Is engaged with an appropriate clearance, and the engagement is neither too shallow nor too deep, and an appropriate engagement can be easily obtained. The screw rod 61 is rotatably supported by a bracket 62 attached to the box 53a, and a manual handle 63 is attached to the base end of the screw rod 61. This screw rod 61
When is screwed into the end face of the idler roll bracket 15 and advances, the bracket 62 is pushed by the flange 61A formed on the screw rod 61, and the box body 53 to which the bracket 62 is attached 53
A is pressed against the idler roll bracket 15. Note that FIG. 5 shows a state in which the drive gear 54 is advanced to the meshing position.

Next, the 4-roll mill shown in FIG.
A roll cutting method using the roll cutting equipment of FIG. 8 will be described. As shown in FIG. 2, the cutting machine 20 and the first roll driving device
With the 31 and the second roll driving device 32 in the retracted position, the 4-roll mill M on the rolling line is pulled out and installed on the bed. Then, the pre-driving spray nozzle 18 and the roll cooling spray nozzle 19 shown in FIG. 1 are removed in advance. Next, as shown in FIG. 9, the cutting board 20 is brought close to the 4-roll mill M, and the cutting tool 20 is advanced to a position where the pair of upper and lower drive rolls 1 can be cut. Further, the drive roll rotation unit 40 of the first roll drive device 31 is moved leftward in the drawing until it coincides with the work position Ps (arrow a). Here, as shown in FIG. 4, the coupling 46 of the drive roll rotation unit 40 is connected to the joint portion 5a of the drive shaft 5 of the drive roll 1,
When the roll drive shafts 41 and 42 are rotated, the pair of upper and lower drive rolls 1 and 1 are rotated, so that the bite 23 of the cutting machine 20 acts on the roll caliber as shown in FIGS. Deformations can be corrected by cutting the 1,1 roll surface.

The cutting of the roll surface by the cutting tool 23 is performed by changing the direction of the cutting tool 23 after the cutting of one roll is completed. The shape of the cutting edge of the cutting tool 23 may be the cutting tool 23 matched to the roll caliber to be modified, but the cutting tool 23 may be two-dimensionally moved so as to match the curve of the caliber and then cut.

When the cutting of the driving rolls 1 and 1 is completed as described above, the cutting of the non-driving rolls is started. As shown in FIG. 10, the first roll driving device 31 is further moved to the left in the figure (arrow b), and the non-driving roll rotation unit mounted therein is installed.
Position 50 at the working position Ps and at the same time drive the second roll
32 is moved to the right in the figure (arrow c), and the non-driving roll rotation unit 50 is positioned at the working position Ps. Then, Fig. 5
As shown in (2), the two non-driving roll rotating units 50 are moved forward (arrow d), and the driving gear 54 thereof is meshed with the driven gear 16 of the non-driving roll 2. Then, as shown in FIGS. 7 to 8, the screw rod 61 is screwed into the idler roll bracket 15 to fix the box body 53 a to the idler roll bracket 15. Here, when the drive motor 55 of the gear box 53 is rotated, the rotational torque is transmitted to the driving gear 54 → the driven gear 16 → the non-driving roll 2 and the non-driving roll 2 rotates, and in this state, the cutting machine By cutting 20 rolls on the roll recover, the roll surface can be cut to correct the deformation. The cutting order of the roll surface by the cutting tool is the same as that described above, and when the cutting of one roll is completed, the direction of the cutting tool is changed and the cutting of the other roll may be performed.

When all the rolls have been cut in the above manner, the cutting machine 20, the first roll driving device 31, and the second roll driving device 32 are returned to their original retracted positions, and the 4-roll mill M
Can be lifted by a crane or the like and moved to the rolling line. The non-driving rolls 2 and 2 may be cut first, and the driving rolls 1 and 1 may be cut later.

The above cutting method was for a 4-roll mill with a vertical stand.
As shown in FIG. 6, the tilt stand 70 itself has a horizontal placement surface 72 separately from the tilt placement surface 71 with the same size as the vertical stand, and the tilt stand 70 is placed on the bed 37 on the horizontal placement surface.
Place and place at 72. In this case, since the drive shaft of the tilt stand 70 and the driven gear are positioned horizontally, the rolls can be cut by the same operation by the first roll driving device 31 and the second roll driving device 32.

[0029]

According to the roll cutting method of the present invention, even a four-roll mill having a non-driving roll can cut the roll without disassembling the roll in the housing. Further, according to the 4-roll mill and the roll cutting equipment of the present invention, the roll cutting method described above can be performed, and the roll cutting can be performed accurately without any trouble.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a 4-roll mill according to an embodiment of the present invention.

FIG. 2 is a plan view of a roll cutting facility according to an embodiment of the present invention.

3 is an enlarged view taken along the line III-III in FIG.

FIG. 4 is a partially enlarged cross-sectional view of a drive roll rotation unit 40.

FIG. 5 is a diagram showing a state in which a drive gear 54 has entered a meshing position.

FIG. 6 is a view showing a state in which a 4-roll mill M of an inclined stand is placed on a bed 37.

FIG. 7 is a partial cross-sectional side view of a gear box 53.

FIG. 8 is a plan view of a gear box 53.

FIG. 9 is an explanatory diagram of a driving roll cutting method.

FIG. 10 is an explanatory diagram of a method for cutting a non-driving roll.

FIG. 11 is an explanatory diagram of a cutting state of a drive roll.

12 is a side view taken along the line XII-XII of FIG.

[Explanation of symbols] 1 driven roll 2 non-driven roll 5 drive shaft 15 idler roll bracket 16 driven gear 17 space 20 cutting machine 31 first roll drive device 32 second roll drive device 37 bed 40 drive roll rotation unit 41 roll Drive shaft 42 Roll drive shaft 50 Non-drive roll rotation unit 53 Gear box 54 Drive gear 55 Drive motor 60 This plate

Front page continued (72) Inventor Takahiro Komiya 5-2 Sokai-cho, Niihama-shi, Ehime Sumitomo Heavy Industries, Ltd. Niihama Works (72) Inventor Hidenori Kondo 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama ) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Ryo Takeda 1-chome, Mizushima Kawasaki Dori, Kurashiki City, Okayama Prefecture (no street address) Kawasaki Steel Co., Ltd. Mizushima Steel Works

Claims (5)

[Claims] 1. A roll cutting method for a 4-roll mill having a pair of driving rolls and another pair of non-driving rolls,
When the 4 roll mill is extracted from the rolling line and installed at the cutting position of the roll cutting equipment, and when cutting the drive roll of the 4 roll mill, the roll drive shaft of the roll drive device is connected to the drive shaft of the drive roll. , Rotating the drive roll, cutting the roll surface of the drive roll with a cutting machine,
When cutting the non-driving roll of the 4-roll mill, the driving gear of the roll driving device is engaged with the driven gear mounted on the side surface of the non-driving roll, and the non-driving roll is rotated by rotating the driving gear. A roll cutting method for a 4-roll mill, comprising rotating a roll and cutting the roll surface of a non-driving roll with a cutting machine. 2. A pair of drive rolls having a drive shaft and another pair of non-drive rolls having no drive shaft are provided, and the pair of drive rolls are axially supported by an upper casing and a lower casing, respectively. The pair of non-driving rolls are axially supported by a pair of idler roll brackets coupled to an intermediate casing between the upper casing and the lower casing, and the non-driving rolls are provided on the side surfaces of the respective non-driving rolls. A driven gear that transmits a rotational torque is provided, and a space that allows the drive gear that engages with the driven gear and that rotates the idler roll bracket is formed in the idler roll bracket. A 4-roll mill characterized by. 3. A bed on which a 4-roll mill for cutting rolls is installed, a cutting machine that can be moved toward and away from the 4-roll mill on the bed, and has a cutting tool for cutting the roll surface, and a bed on the bed. It comprises a first roll driving device and a second roll driving device whose positions are freely changeable between a working position for rotationally driving the rolls of a four-roll mill and a retracted position separated therefrom. It is connected to the drive shaft of the drive roll of the roll mill and meshes with the drive roll rotating unit equipped with the roll drive shaft and its power source for rotating it, and the driven gear of one of the non-drive rolls of the four roll mill. , Equipped with a non-drive roll rotation unit with a drive gear to rotate it,
The second roll driving device includes a non-driving roll rotation unit including a driving gear that meshes with a driven gear of the other non-driving roll of the 4-roll mill and rotates the driven gear. Roll cutting equipment for roll mills. 4. The non-driving roll rotation unit comprises a slide unit on a base frame and a gear box mounted on the slide unit, the gear box including a drive gear protruding from a tip thereof and a drive gear. 4. The roll cutting facility according to claim 3, further comprising: a drive motor and a gear train that transmits the power of the drive motor to the drive gear. 5. The gear box is provided with a contact plate for contacting an end surface of an idler roll bracket of a 4-roll mill and a screw rod for connecting the box body of the gear box to the idler roll bracket. The roll cutting equipment according to claim 4.