WO2002018070A1

WO2002018070A1 - Ring roll replacing method in bar steel rolling mill and device therefor

Info

Publication number: WO2002018070A1
Application number: PCT/JP2001/000665
Authority: WO
Inventors: Ryo Takeda; Yoshihiro Shinkai
Original assignee: Kawasaki Steel Corporation
Priority date: 2000-08-29
Filing date: 2001-01-31
Publication date: 2002-03-07
Also published as: US20020134127A1; EP1184095A2; TW480194B; AU2001232224A1; EP1184095A3; KR20020060719A

Abstract

An easy ring roll replacing method in a bar steel rolling mill and a device therefor, the method using an optimal process of replacing a ring roll without disassembling a housing. A ring roll replacing method, in a bar steel rolling mill having a plurality of roll assemblies incorporated in a housing equiangularly in a circumferential direction, comprising the steps of freeing the tight-fitting between a used ring roll and a roll shaft, moving the roll shaft axially to pull it off the used ring roll, replacing the used ring roll with a new one in the housing, thrusting the roll shaft through the new ring roll, and coupling them together by tight-fitting. In addition, provided are a bar steel rolling mill body and a roll shaft hoisting device both having mechanisms suitable for this method.

Description

Specification

How to change the ring roll of a strip rolling mill

The present invention relates to a method and an apparatus for easily replacing a ring roll of a strip steel rolling mill, which are easy to perform. In addition, the ring roll exchanging device is composed of a main body of a strip rolling mill having a roll exchanging mechanism and a roll shaft suspending device. Background art

Several sizing mills are installed at the last stage of a continuous rolling mill row for hot rolling of rods and bars such as steel bars. The sizing mill uses a strip rolling mill in which a plurality of roll assemblies are arranged at equal angular intervals around the center of the path and supported by a housing. The roll assembly is a composite of a ring roll that comes into contact with the material to be rolled and a roll shaft that fits in a ring hole of the ring roll and supports the ring roll. Japanese Patent Application Laid-Open No. H11-104706 discloses a strip rolling mill having a structure in which a ring roll exchange operation is easy. This is a roll rolling mill in which a plurality of roll units and an eccentric cartridge type rolling reduction device for the roll units are attached to a housing. The roll unit has the same meaning as the roll assembly. The housing is formed of a split housing that can be freely coupled and separated, and includes a first housing and a second housing. A half bearing portion is formed on a mating surface of the first housing and the second housing. The shaft portion of each roll unit is held between the first and second housings via an eccentric cartridge in a bearing in which two half bearing portions are combined. The jaw exchanging operation in this strip rolling mill is performed in the following procedure.

(1) Remove the second housing from the first housing. (2) Take out the roll cutout from the first housing as it is.

(3) Replace the roll unit of the roll unit that has been taken out.

④Assemble the roll unit into the first housing.

取り付ける Attach the second housing to the first housing.

In this way, the rolling mill can be disassembled and assembled with a small number of man-hours, so that roll exchange is also easy.

However, the roll replacement work of this strip rolling mill still had the following problems.

(1) If the same roll shaft is used before and after the roll change, it is necessary to use a special device to change the ring roll of the shaft shaft, and this work takes a long time.

(2) If separate roll axes are used before and after the roll change, it is necessary to have many roll axes, which increases costs. Also, a large storage space is needed.

(3) When replacing the roll, the housing must be disassembled in half and the bearing surface, etc., is open. Therefore, it is easy for garbage and water to enter and induce mechanical trouble. There has been a demand for a roll replacement method capable of solving these problems, and a strip and bar rolling mill main body and peripheral devices that are advantageous for performing the method. Disclosure of the invention

Therefore, the inventors studied a method of replacing only the ring roll without dismantling the housing, and found a method using an optimal procedure. Further, the present inventors have developed a method for tightening and tightening the roll and roll shaft main body, which has a mechanism capable of replacing only the ring roll without disassembling the housing, which is suitable for the invention method. We have developed a port shaft suspension device that can be used for hydraulic pressure supply and port shaft suspension required for release. That is, the present invention relates to a method for controlling a plurality of roll assemblies at equal angular intervals in the circumferential direction. In the steel bar rolling mill incorporated in the jig, the used ring roll and the roll shaft are tightened and released, and the roll shaft is moved in the axial direction to be pulled out from the used ring roll, and the used ring roll and the new This is a ring roll replacement method that consists of replacing the ring roll, inserting the roll shaft into the new cylinder roll, and tightening the new ring roll and the roll shaft together.

According to this method, only the ring roll can be replaced without dismantling the housing.

Further, the present invention provides a ring roll and a housing capable of releasing the interference fit and the interference fit, which are suitable for the above-mentioned ring mouth changing method, and which can be moved in the axial direction within the housing. A strip rolling mill in which a plurality of roll assemblies consisting of roll shafts are arranged at equal angular intervals around the center of the path and supported by a housing.

In this strip rolling mill, the roll shaft can be pulled out of the ring roll by gripping and pushing and pulling the roll shaft end. In this way, after freely replacing the ring roll with a new one, the roll shaft can be inserted into the ring roll, and the interference fit can be performed.

The roll assembly has a mechanism for hydraulically releasing the interference fit between the ring roll and the roll shaft. The inner diameter of the ring roll and the ring roll mounting portion of the roll shaft are tapered. It is more preferable that the surface has a surface formed, a hydraulic pipe pass from one end of the roll shaft to the inside of the roll shaft, and an oil inlet and a suspension jig receiver are provided at one end of the roll shaft.

This is because both tapered surfaces can be closely contacted and separated by hydraulic pressure applied from the roll shaft end through the inside of the roll shaft, and the roll shaft and the ring roll can be tightly fitted and fastened. In addition, the ring mounting part of the roll shaft and the ring nozzle are made to adhere or separate with a tapered surface, so a tapered surface is also required. (4) The effect makes the interference fit stronger, and the separation can be performed more smoothly.

In addition, since the roll shaft end on the hydraulic pressure input side is located outside the housing, hydraulic pressure is applied to all the roll assemblies in sequence from outside the housing, and both tapered surfaces can be freely adjusted. It can adhere or separate.

Note that all of the plurality of roll assemblies may be driven, and some may be driven and the rest may be non-driven.

Further, from the viewpoint of versatility, the strip rolling mill according to the present invention is preferably a four-roll mill in which four roll assemblies are arranged at equal angular intervals around the center of the path and supported by a housing.

Further, the present invention provides a nozzle for injecting oil into an oil injection port provided at one end of a roll shaft of a roll assembly, which is suitable for the above-mentioned ring roll exchange method, A rod through which an oil supply passage is passed, a cylinder that holds the rod and hydraulically drives the rod to move forward and backward, and a hanging jig provided at one end of the roll shaft at the tip of the rod. This is a single-port shaft suspension device having a suspension jig that engages with the receiver. It is more desirable that the rod has a mechanism for holding the nozzle via an elastic seat.

By applying this roll shaft suspension device to the method of the present invention, the roll can be changed more reliably and quickly. This is because, before the loose fit between the used ring roll and the roll shaft is released, the roll shaft of the roll assembly to be replaced must be vertical, and before the used ring roll is pulled out of the mouth shaft, This is because the ends of the woolen shaft can be connected to each other, and the hydraulic pipe in the woolen shaft can be connected to the hydraulic source via the one end of the woolen shaft. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a main part of the structure of a strip rolling mill according to the present invention.

FIG. 2 is a sectional view showing a means for applying oil pressure to the tapered surface.

FIGS. 3 (a) to 3 (j) are diagrams for explaining the procedure of the method of replacing a ring roll of a strip rolling mill according to the present invention with reference to FIGS. 3 (a) to 3 (j).

FIGS. 4 (a) to 4 (e) are diagrams illustrating a procedure of a ring roll changing method using the roll shaft suspension device according to the present invention in accordance with (a) to (e).

FIG. 5 is a cross-sectional view of a tip end of a mouth showing an example of a groove fitting claw plate. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in further detail with an application example to a strip rolling mill (hereinafter abbreviated as a four-roll mill) in which four roll assemblies are arranged at equal angular intervals around the center of the path and supported by a housing.

FIG. 1 is a sectional view showing a main part of the structure of a four-roll mill according to the present invention. FIG. 1 shows a part 1-4 around the center 16 of the path. By connecting Figure 1 rotated 90 °, 180 °, and 270 ° around the path center 16, the whole image can be obtained.

The roll assembly is configured by attaching a ring roll 2 to a ring mounting portion 1A located at the lower end side of a roll shaft 1. The outer peripheral surface of the ring roll 2 forms the work roll surface. A tapered surface is formed on the outer peripheral surface of the ring mounting portion 1A, which is an engaging portion between the roll shaft 1 and the ring roll 2, and on the inner diameter side of the ring roll 2, and both tapered surfaces are tightly fitted to each other. Note that, in this example, the outer peripheral surface of the ring mounting portion 1A forms a male tapered surface that is inclined upward toward the upper end side of the roll shaft 1. A tapered sleeve 3 having a female tapered surface on the inner diameter side that fits with the male tapered surface is fitted on the inner diameter side of the ring roll 2. Tightening fit between roll shaft 1 and ring roll 2 The removal is performed by, for example, applying hydraulic pressure to close or separate the male and female tapered surfaces.

The bearings 4A and 4B are mounted at two locations sandwiching the ring mounting portion 1A at the lower end of the roll shaft 1, and the bearing 5 is mounted at one location at the upper end. The lower end bearings 4A and 4B are supported by the housing 8 via the lower eccentric cartridge 6A. The upper end bearing 5 is supported by a housing 8 via an upper eccentric cartridge 6B and a thrust adjusting screw 7. The upper end of the roll shaft is exposed outside the housing 8.

The lower eccentric cartridge 6A supports the bearings 4A and 4B, and the upper eccentric cartridge 6B supports the bearing 5 so as to be slidable in the roll axis direction. The lower eccentric cartridge 6A and the upper eccentric cartridge 6B are supported by a housing 8 so as to be rotatable around their own axes. By rotating the lower eccentric cartridge 6A around its own axis, the center of the roll shaft 1 rotates around the center of the lower eccentric cartridge 6A. The same applies to the upper eccentric cartridge. As described above, the eccentric cartridge 6 moves the roll shaft 1 in a direction orthogonal to the shaft, and is used for adjusting the distance from the center of the ring roll 2 to the center 16 of the path, that is, the roll-down position. The lower eccentric cartridge 6A and the upper eccentric cartridge 6B are connected so that the interval between them is variable. The bearing 5 is screwed to the upper eccentric cartridge 6B with a lock screw 9.

In this structure, the outer diameters of the bearings 4A and 4B are less than the inner diameter of the tapered sleeve 3, and the tapered surfaces of the roll shaft 1 and the ring roll 2 are separated from each other. Then, release the lock screw 9 and move the roll shaft 1 in the roll axis direction. As a result, the roll shaft 1 can be extracted from the ring roll 2.

The thrust adjustment screw 7 moves the upper eccentric cartridge 6B around its own axis Support rotatably. The thrust adjusting screw 7 is screwed into a screw receiver 10 screwed to the housing 8 on the outer peripheral side. Further, the thrust adjusting screw 17 is locked to the screw receiver 10 by the clamp port 11. Therefore, the position of the roll assembly in the roll axis direction can be adjusted by loosening the clamp port 11 and turning the thrust adjustment screw 7.

FIG. 2 is a cross-sectional view showing a means for applying oil pressure to the tapered surface. The oil supply passage 12 passes from the oil inlet 12A opening at the roll shaft end face to the oil outlet 12B through the inside of the roll shaft. The roll shaft end where the oil inlet 12A opens is exposed outside the housing, and has a circumferential groove 22 in the exposed roll shaft end portion. The circumferential groove 22 serves as a receiving portion of a suspending jig for suspending the roll shaft 1. The oil outlet 12B is open at a plurality of locations on the tapered surface of the ring mounting portion 1A.

When the high pressure oil is injected from the oil inlet 12A when the initial state is the state where both taper surfaces are in close contact, the inner diameter of the taper sleep 3 expands within the elastic deformation due to the oil pressure from the oil outlet 12B. In addition, a repulsive force is generated between the two tapered surfaces due to the reaction of expanding the inner diameter, and the tapered surfaces are easily separated. Thereafter, when the oil pressure is reduced and the inner diameter of the tapered sleeve 3 returns to the original state, the tapered sleeve 3 is in the separated state. As a result, the roll shaft 1 can be pulled out of the housing and pulled out of the ring roll 2.

On the other hand, when the initial state is the double tapered surface separation state, when high pressure oil is injected while pressing the roll shaft 1 into the housing with a pressing force enough to overcome the double tapered surface repulsion, the inner diameter increases due to hydraulic pressure The portal shaft 1 enters the smaller diameter side of the taper sleep 3. Thereafter, when the oil pressure is reduced and the inner diameter of the tapered sleeve 3 returns to its original state, a strong double tapered surface close contact state can be obtained.

As described above, in the strip rolling mill according to the present invention, the interference fit between the ring roll and the shaft can be canceled and the interference fit can be released within the housing. That is, Only the ring roll can be replaced without dismantling the housing. Next, a method for exchanging rolls of the above-mentioned 4-roll mill will be described. This method is performed according to the following procedure, and this is shown in Fig. 3 (a;) to (j).

1. Housing preparation work

(1) Set the housing on the exchange table using a crane or the like.

(2) Remove the rolling mill guide (on-line installation jig, etc.).

(3) Set the eccentric position of the eccentric cartridge to a predetermined position.

2. Roll change work

(Removal work)

(1) Operate the exchange platform to rotate the housing and make the roll axis vertical. The exposed end of the shaft is the upper side.

(2) Loosen the clamp port 11 (Fig. 3 (a)).

(3) Turn the thrust adjustment screw 7 to lower the roll assembly, and bring the lower end surface of the ring hole 2 into contact with the lower eccentric cartridge 6A (Fig. 3 (a)).

(4) Remove the lock screw 9 (Fig. 3 (b)).

(5) Put the press ring 13 on the roll shaft 1 (Fig. 3 (b)).

(6) Set the oil injection device 14 to the working position (Fig. 3 (c)).

(7) Connect the injection nozzle 14B to the oil inlet at the end of the roll shaft (Fig. 3 (d)).

(8) Press the push ring 13 with the buffer cylinder 14A (Fig. 3 (d)).

(9) Raise the oil pressure of the injection nozzle 14B and lower the oil pressure of the buffer cylinder 14A (Fig. 3 (e)). → The taper surface is separated.

(10) Pull up the buffer cylinder 14A and release the push ring (Fig. 3)).

(11) Remove the injection nozzle 14B from the oil inlet at the end of the roll shaft (Fig. 3 (f)). (12) Return the oil injection device 14 to the standby position.

(13) Remove the push ring 13 from the roll shaft 1 (Fig. 3 (g)).

(14) Set the lifting device 15 to the working position (Fig. 3 (g)).

(15) Lower the lifting tool 15B using the lifting cylinder 15A (Fig. 3 (h)).

(16) Fix the hanging tool 15B to the roll shaft 1 (Fig. 3 (h)).

(17) The roll shaft 1 is lifted by the lifting cylinder 15A via the lifting tool 15B, and is removed from the ring roll 2 (FIG. 3 (i)).

(18) Remove the ring roll 2 from the housing (Fig. 3 (j)).

(Installation work) ·

(19) Insert a new ring roll 2 into the housing.

(20) Using the lifting cylinder 15A, lower the roll shaft 1 into the ring roll via the lifting tool 15B.

(21) Remove the hanging tool 15B from the shaft 1.

(22) Lift the lifting tool with the lifting cylinder 15A.

(23) Return the lifting device to the standby position.

(24) Put the push ring on the roll shaft.

(25) Set the oil injection device to the working position.

(26) Connect the injection nozzle to the oil inlet at the end of the roll shaft.

(27) Increase the oil pressure of the injection nozzle while pressing the push ring with the buffer cylinder. → The taper surface is in close contact.

(28) Raise the buffer cylinder and release the pushing ring.

(29) Remove the injection nozzle from the end of the mouth shaft.

(30) Return the oil injection device to the standby position.

(31) Remove the push ring from the roll shaft. (32) Lock the hook screw.

(33) Turn the thrust adjustment screw to roughly adjust the position of the roll assembly in the roll axis direction, and tighten the clamp port.

3. Rotate the housing by 90 ° on the exchange table, and repeat the procedure in section 2.

4. Final roll position adjustment work

(1) Position the housing so that it can be set on the projector.

(2) Set the projector. The projector is a device that projects the shadow of the outer peripheral surface of the ring roll on a monitor.

(3) Loosen the clamp port and align the roll with the thrust adjustment screw 5 o

(4) Tighten the clamp bolt to fix the thrust adjustment screw.

(5) Turn the eccentric cartridge to set the roll gap.

(6) Remove the projector.

(7) Remove the housing from the exchange base.

Next, an example of the roll shaft suspension device according to the present invention will be described with reference to FIG. 4 (a). The upper half of FIG. 4 (a) is the roll shaft suspension device according to the present invention, and the lower half is a part of the strip rolling mill. The roll shaft suspension device includes a nozzle 115 for injecting oil into an oil injection port 131 provided at an upper end portion of a roll shaft 101 of a strip steel rolling mill, a nozzle 115 that holds the nozzle 115 at a tip end, and an oil supply path to the nozzle 115. It has a mouth 116 through which the inside 117 is passed, and a cylinder 118 which holds the rod 116 and hydraulically drives the rod 116 to move forward and backward.

The high-pressure oil is injected from a high-pressure oil inlet 126 of an oil supply passage 117. It is preferable that the injection pressure of the high-pressure oil is about 2000 kgf / cm ² (196 MPa) at the maximum, and the deformation of the tapered surface is set to a pressure within the elastic range. During high-pressure oil injection, the rod 116 holds down the roll shaft 101. Also, after the interference fit between the ring roll 102 and the roll shaft 101 is released, the mouth 116 is rolled. Lift the shaft 101. In order to perform this pressing and lifting, it is preferable that the driving pressure of the rod 116 of the hydraulic cylinder 118 is set at a maximum of about 700 kgf / cm ² (69 MPa) and the pressure at which the roll shaft moves smoothly.

The way of holding the nozzle 115 at the tip of the rod 116 may be by screwing or the like. However, as shown in this example, it is preferable to hold through a resilient seat 125 such as a push spring or a fluid pressure cylinder, because the impact during high-pressure oil injection can be more effectively reduced.

If it is difficult to push the roll shaft end directly with the rod tip, a pushing jig for transmitting the pushing force may be used. The push ring 119 in FIG. 4 (b) is an example. In this case, it is preferable to provide a push jig receiver that engages with the push jig at the distal end of the rod 116. For the push ring 119, the ring fitting hole 121 corresponds to a push jig receiver.

The roll shaft suspending device according to the present invention further includes a suspending jig that is engaged with a suspending jig receiver provided at an end of the roll shaft. In FIG. 4 (a), a circumferential groove 122 is shown as a hanging jig receiver, and a groove fitting claw plate 123 is shown as a hanging jig that engages therewith. With this suspending jig, it becomes possible to lift the shaft 101 after the tight fit with the ring mouth 102 has been released by the pulling force of the hydraulic cylinder 18.

The groove fitting claw plate 123 is preferably, for example, a half-arc shape as shown in FIG. Further, from the viewpoint of workability and safety, the roll shaft suspension device according to the present invention is used by being attached to a mounting base 127 shown in FIG. 4 (a), which is immovable and rigidly constituted by a steel frame or the like. Is preferred.

Hereinafter, a method for replacing a ring roll of a strip steel rolling mill using the roll shaft suspension device according to the present invention will be described with reference to FIGS. 4 (a;) to (e). The description of the operation before and after this step that does not use the roll shaft suspension device is omitted. I. Rotate the exchange table (rotatable: not shown) on which the housing 111 is mounted, and move the roll assembly 120 directly below the nozzle 115. After the center axis of the nozzle 115 is aligned with the center axis of the oil inlet 131, the lock port 112 is released. Then, the screw 107 is turned to lower the roll assembly 120 to a position where the roll assembly 120 comes into contact with the eccentric cartridge 106 of the ring roll 102. (Fig. 4 (a))

Π. Loosen the clamp port 110 and release the screw holder 109 from the housing 111. Then, set the push ring 119. (Fig. 4 (b))

IH. Set the cylinder 118 to “push” and advance the rod 116 to the position where it comes into contact with the push ring 119. Here, the nozzle 115 is automatically connected to the oil inlet 131. Next, the groove fitting claw plate 123 is fitted into the circumferential groove 122. (Fig. 4 (c))

IV. High-pressure oil is injected from the high-pressure oil inlet 126. Here, the tapered surfaces of the ring mounting portion 101A and the tapered sleeve 102A are deformed in the elastic region, and the interference fit is released. The roll shaft 101 moves up slightly away from the ring roll 102. (Fig. 4 (d))

V. Pull the cylinder 118 to pull the rod 116 backward. Here, the roll shaft 101 is pulled upward from the ring roll 102 (FIG. 4 (e)).

VI. Remove the ring roll 102 from the housing 111 and insert a new ring roll. Thereafter, steps I to v are performed in reverse. Since the operation is reversed, for example, “pull” becomes “push”.

Then, the above steps I to VI are executed for each of the plurality of bar steel rolls in the housing. Industrial applicability

Thus, according to the present invention, the following various excellent effects can be obtained.

• The housing dismantling process can be omitted, reducing the roll change time and reducing labor costs Wear.

• Since there is no dismantling of the housing, mechanical trample is reduced, and operation capacity and equipment capacity are improved.

'Since it is not necessary to replace the roll shaft, the number of roll shafts held can be reduced and the roll storage space can be saved.

• In the conventional roll change with housing disassembly, a housing disassembly device and a roll changer were required. However, in the present invention, only a roll changer is sufficient, so that the number of equipments can be reduced.

• The handling target was a roll assembly in the past, but in the present invention, it is a binder roll, which reduces the weight and improves work safety.

Further, if the roll shaft suspension device of the present invention is used, the ring roll replacement operation can be performed by a single device. Therefore, workability, operability and work efficiency are improved, and work space can be saved.

Furthermore, since oil injection is applied to the inner surface of the ring roll and the tapered surface of the ring roll mounting portion of the roll shaft, the sliding surface pressure is low and lubrication is good. Therefore, the tapered surface has almost no wear and deformation, and the fitting allowance can be maintained in a healthy state for a long time. As a result, the life of parts is prolonged, and there is less trouble due to insufficient conduction torque.

Claims

The scope of the claims

1. Tighten and release the used ring roll and roll shaft, move the roll shaft in the axial direction, pull out the used ring roll, replace the used ring roll with a new ring roll in the housing, and Inserting a roll shaft into a ring roll and tightening and tightening the new ring roll and roll shaft. A method for replacing a roll roll in a bar rolling mill that incorporates multiple roll assemblies into the housing at equal angular intervals in the circumferential direction.

2. Use the hydraulic pressure to tighten and release the interference fit between the ring roll and roll shaft.

3. Before tightening and releasing the used ring roll and the roll shaft, replace the roll. Make the roll axis of the mouthpiece vertical, and before pulling out the mouth shaft from the used ring roll, remove The method described in 2. above, in which one end of the roll shaft is connected, and the hydraulic pipe in the roll shaft is connected to a hydraulic source through one end of the roll shaft.

4. Tight fit to the roll shaft. A ring roll that can release the tight fit and a plurality of port assemblies consisting of a port shaft that can move in the housing in the axial direction, around the center of the path, etc. Strip rolling mills arranged at angular intervals and supported by a housing

5. The roll assembly has a mechanism for hydraulically engaging and releasing the interference between the ring roll and the roll shaft and releasing the interference fit. The tapered surface is formed, a hydraulic pipe is provided from one end of the roll shaft to pass through the inside of the roll shaft, and an oil injection port and a jig support are provided at one end of the roll shaft. Strip rolling mill

6. There are four roll assemblies to be arranged.

7. Inject oil into the oil inlet provided at one end of the roll shaft of the roll assembly A nozzle, a port for holding the nozzle at the tip and an oil supply passage to the nozzle inside, a cylinder for holding the rod and hydraulically driving the advance and retreat, and a tip for the rod, A roll shaft suspending device having a suspending jig engaged with a suspending jig receiver provided at one end of the roll shaft.

8. The roll shaft suspension according to 7, wherein the rod holds the nozzle through a resilient seat.