JPH0446610A - Operation stand for cold tube roller - Google Patents

Abstract

PURPOSE: To improve the mounting and setting precisions of rolls, and to make it possible to remarkably shorten the changing time of the rolls by connecting compactors each other so that the joint movements of the compactors approaching each other, can be performed. CONSTITUTION: By providing wedge shape compactors 8 connected each other so that the joint movements of the compactors 8, can be performed in the approaching direction each other, when mounting a pair of the new rolls 5 and 6, a sufficiently large gap can be secured between a chock 7 and the opening part of a movable housing 2. By this gap, the mounting of the rolls 5 and 6 into the movable housing 2, is remarkably simplified, and this gap can be immediately removed by making the movable compactors 8 perform the joint movements in the approaching direction each other. Also, the nongap seal of the chock 7 can be secured over the whole contact surface. Consequently, the vibrations of the rolls 5 and 6, can be eliminated, and the original mounting states of the rolls 5 and 6, can be held.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tube rolling machine, and more particularly to a work stand for a cold rolling mill.

The present invention can be most efficiently used in cold rolling mills with movable housings.

(Prior Art) At present, in the field of tube rolling, cold tube rolling machines with a large length deformation region are widely used. The roll grooves gradually wear out, so the rolls must be replaced when switching to a new size of rolled tube.

However, it is difficult to install new rolls in the movable housing of a rolling mill, and adjusting the rolls and setting the passes is time consuming and lengthy. Is it necessary to stop the rolling mill? This situation is even worse in the case of work stands with several pairs of rolls for multi-strand rolling.

Therefore, it is an urgent issue to improve the working accuracy and speed and to improve the maintenance conditions of the stand.

West German Patent No. 1527752 (DEC152) is a work stand for a conventionally known cold tube rolling machine.
No. 7752B21B21/100), the work stand comprises a movable housing containing a vertically mounted roll drive rack, a movable housing with a connecting slot fixing pin, a chock and a drive pinion. It has vertical rolls with a chocks compactor and screwdowns for adjusting the position of the rolls. A drive pinion is located on one side of the movable housing, and each pair of work rolls is offset in the rolling direction with respect to an adjacent pair.

The rolls of the conventional stand are replaced one by one,
It requires a considerable amount of manual labor. Adjusting the roll in the axial direction by adjusting the adjustment bolt after replacing the roll is difficult because the roll groove cannot be seen;
Therefore, the adjustment work requires a long time and good results cannot be obtained.

In this work stand and other work stands, the radial adjustment of the roll position after roll change is primarily carried out by means of a wedge-shaped screw tightening device.

Each roll is provided with a pair of such screwing devices, the wedges of which can be moved individually by means of two screws.

In stands with vertical rolls, access to the screws of the screwing device below is difficult and requires a complete stoppage of the rolling mill, which leads to further wastage of time.

The roll can be compacted in the rolling direction simply by changing the thickness of the sealing strip.

There is always an assembly gap between the strip and the roll chock, and during operation, the roll vibrates when the movable housing is opened and is prone to hitting the backplace. This results in high dynamic loads that wear the strips and chocks, hinders the initial installation and setting of the rolls, and results in poor product tube quality.

As long as the roll drive rack is placed on one side of the pair of rolls and the connecting rod pin is placed so that it does not coincide with the center of gravity of the movable housing, the circumferential forces of the rack and pinion gearing and the connecting The vertical component of the force acting on the grod produces an overturning moment in the rolling direction. This reduces the smoothness of the movement of the work stand, wears out the guideways due to increased dynamic loads, prevents the initial installation and setting of the rolls, and reduces the quality of the product tube. .

(Problems to be Solved by the Invention) Therefore, the main object of the present invention is to provide a work stand for a cold tube rolling mill, which can improve roll mounting and setting accuracy, considerably shorten roll replacement time, and An object of the present invention is to provide a work stand for a cold tube rolling mill designed to improve the maintenance conditions of the work stand.

(Means for Solving the Problems) The above objects of the present invention include a fixed housing, a movable housing having a pin for attaching a connecting rod of a stand drive device, and at least one pair of vertical rolls. The vertical roll is equipped with a rack and pinion drive device consisting of a chock and a vertically fixed rack and a pinion fixed to the roll, and further includes a wedge-shaped screw tightening device for adjusting the roll gap. in a working stand of a cold tube rolling mill having a bar, the bar interconnecting the upper chocks of said pair of rolls, said bar being disposed within a movable housing and having a turntable provided therein; one end of the turntable is fixed to the fixed housing via a vertical shaft, the other end of the turntable is fixed to the fixed housing via a movable wedge lock, and the turntable is fixed to the fixed housing via a vertical shaft. , supports a rack of a rack and pinion drive of one roll of the pair of rolls, and the rack is diagonally symmetrical with respect to a rack of the rack and pinion drive of the other roll of the pair of rolls. (skewsymmetrical
ly), and a wedge-shaped compactor is arranged between the chock of each roll and the movable housing, the compactors being interconnected so as to allow joint movement toward each other. This is achieved by the work stand of a cold tube rolling mill.

This design of the work stand makes it possible to carry out preliminary work for changing the rolls, and it is also possible to install part of the rolls on the rolling mill during operation. Rolls prepared for exchange are preliminarily mounted with their chocks on a bar remote from the work stand and adjusted axially. This allows the axially adjusted rolls to be replaced in pairs rather than one by one, thus providing accurate adjustment and reducing roll change times.

By attaching a turntable to a fixed housing and attaching a fixed shaft and a movable wedge lock to the turntable, it is easy to free up the working space of the fixed housing for maintenance and roll changes, and at the same time, it is possible to easily remove the work space from the roll pinion to one rack. can be disengaged. This means that rotation of the turntable allows partial disassembly of the work stand.

By arranging the gear rack of one roll on the turntable diagonally symmetrically with respect to the rack of the other roll, the overturning moment in the rolling direction caused by the circumferential force of the rack and pinion gear device is eliminated. can do.

Joint motion in the direction of approaching each other (joint mov
By providing wedge-shaped compactors interconnected such that -ement) a sufficiently large gap can be ensured between the chock and the opening of the movable housing when installing a new pair of rolls. . This gap considerably simplifies the installation of the rolls into the movable housing and can be immediately removed by joint movement of the movable compactors towards each other.

In addition, the above configuration makes it possible to ensure a gapless seal (tight seal) of the chock over all contact surfaces, thereby eliminating roll vibration and maintaining the original mounting state of the roll. .

In practice, the wedge-shaped compactor and wedge-shaped screw tightening device of said chock are each configured in the form of two pairs, each of which consists of a wedge arranged vertically opposite each other, each in a multi-pair. wedges are in contact with each other on an inclined surface, one of the wedges being fixed to the movable housing and having a longitudinal slot and a guide, the guide being disposed on the inclined surface. said movable wedge, said movable wedge having a longitudinal projection fitted into a longitudinal slot of said fixed wedge, said movable wedge of said two pairs disposed opposite each other; The wedges are interconnected by screw-nut pairs to allow joint movement. The threads of the screw-nut pair of each wedge-shaped screwdriver may be arranged vertically on the pin attaching the connecting slot, and the pin is arranged vertically in a vertical plane passing through the center of gravity of the movable housing. It is press-fitted into a boss provided in the housing.

This configuration of the compactor and wedge-shaped screw tightening device allows radial adjustment and compaction of the chocks of one pair of rolls with a significantly smaller number (4 times) of screws, thus: Stand maintenance, roll setting time can be reduced, and adjustment accuracy can be improved. Further, by providing a special boss in a vertical plane passing through the center of gravity of the movable housing, the pin of the connecting rod is press-fitted into the boss so that the axis of the pin of the connecting rod coincides with the center of gravity of the movable housing. I can do it. Thereby, the pin can be used on the one hand as a support for the screw of a screw tightening device, and on the other hand as a member for removing the overturning moment of the movable housing in the rolling direction. Therefore, the gap between the joint between the connecting slot and the pin becomes smaller, and the smoothness of the movement of the stand can be improved and dynamic loads can be reduced.

(Embodiments) Hereinafter, embodiments of a work stand for a cold tube rolling mill according to the present invention will be described in detail with reference to the accompanying drawings.

The working stand of a cold tube rolling mill according to the invention comprises a fixed housing l (FIG. 1) and a connecting slot 4.
a movable housing 2 with pins 3 for attaching the chocks 7, a pair of vertical rolls 5.6 with upper and lower chocks 7 (Fig. 2), and a wedge-shaped compactor 8 of the chocks 7 (Fig. 1).
, a wedge-shaped screw tightening device 9 for adjusting the gap between the rolls 5 and 6, and a rack-and-pinion drive for rotating both rolls 5,6.

The rack and pinion drive for the roll 5 (FIG. 2) has a rack 10 fixed to a fixed housing l and a pinion 11 fixed to the lower end of the roll 5.

The rack and pinion drive device for roll 6
It is formed by a rack 12 and a pinion 13 fixed to the upper end of the rack. The rack 12 is arranged diagonally symmetrically with respect to the rack 10. This means that the engagement line between the pinion and the rack is aligned with the rolling axis.
xes) 0, -0. It means that they are placed at the same distance on both sides of the vertical plane O-O passing through.

The stand is also provided with a bar 14 (FIGS. 1 to 3) fixed to the movable housing 2.
4 supports a chock 7 above the pair of rolls 5.6 and a turntable 15 supporting a rack 12.

One end of the turntable 15 (FIG. 3) is attached to the fixed housing 1 by a vertical shaft 16, and the other end is a movable motor moved by a fluid cylinder 18 (the shell of which is fixed to the fixed housing 1). wedge lock 1
7 to the fixed housing 1.

Each wedge-shaped compactor 8 of the roll chock 7 consists of two wedges 19, 20 arranged oppositely in a vertical plane.
The wedges 20 have the form of two pairs A and B, and the multiple pairs of wedges 20 are interconnected so that they can jointly move toward each other.

The wedges 19, 20 of the multiple pairs A and B have inclined surfaces facing each other. Each wedge 19 is fixed to the movable housing 2 and is provided with a longitudinal slot 21 (FIG. 4). On the other hand, the wedge 20 (FIG. 3) is movable in a direction perpendicular to the wedge 19, and has a longitudinal projection 2 which is fitted into a slot 21 of the wedge 19.
2 (Figure 4). In order to allow the wedge 20 members of pairs A and B to move toward each other,
The movable wedge 20 is connected by a screw-nut pair consisting of a stud 23 and a nut 24,25. The movable wedge 20 is a wedge-shaped screw clamp that is movable relative to the wedge 19 in a guide 26 (FIG. 3) formed by a strip fixed to the inclined surface of the wedge 19 by a bolt 27. The device 9 (FIGS. 1 and 2) is constructed similarly to the compactor 8, each screwing device 9 consisting of two wedges 28, 29 arranged vertically and opposite each other. It is formed by pair C and D. The sloping surfaces of the wedges 28, 29 are opposite each other, and the wedges 28 are fixed to the movable housing 2 and have longitudinal slots 30 (FIGS. 1 and 5). On the other hand, the wedge 29 is movable in a direction perpendicular to the wedge 28 and is provided with a longitudinal projection 31 that fits into a slot 30 of the wedge 28 . The wedge 29 is moved by a screw-nut pair, the screw 32 of which passes through the protrusion 31 of the wedge 29.

A bush 33 is arranged on the protrusion 31 of the wedge 29 of pair C. As shown in FIG. 5, the bushing 33 has a female thread that engages with the screw 32, a circular shoulder provided at one end of the bushing 33 that abuts the outside of the protrusion 31, and a bushing. 33 and a threaded portion provided on the outside of the other end.

A nut 34 is supported on the threaded portion of the bush 33,
The nut 34 axially fixes the bushing 33 to the wedge 29. This means that the bushing 33 moves together with the wedge 29.

A lock nut 35 attached to the screw 32 fixes said screw 32 to the bushing 33.

With this design of the wedge pair C, the wedges 29 of the pair C, D
You can move them together or separately.

Each movable wedge 29 (FIG. 2) is movable relative to the fixed wedge 28 in a guide 36 formed by a strip, which is fixed by a bolt 37 on the inclined surface of the fixed wedge 28. I can do it. The screw 32 is arranged vertically and is fixed on the pin 3 which fixes the connecting rod 4. Pin 3 is connected to movable housing 2
The pin 3 is press-fitted into a boss 38 disposed on the movable housing 2 in a vertical plane passing through the center of gravity of the housing 2, and the axis of the pin 3 also passes through the center of gravity of the housing 2.

A cover 39 is attached to the turntable 15 to protect the work space of the fixed housing 1 of the work stand, while a cover 40 disposed above the rack 10 is attached to the turntable 15.
protects the roll drive gear.

The roll 5.6 is held to the bar 14 by bolts 41. An adjustment shim 42 is arranged between the chock 7 of the roll 5 and the bar 14.

Bar 14 is fixed to stationary housing 2 by bolts 43.

The embodiment of the stationary housing shown in FIG. 6 has two roll pairs 44,45, and the multi-channel has individual roll pairs vertically offset from each other. The roll pairs 44, 45 are arranged similarly to the stands of FIGS. 1-5. The screw of the wedge-shaped screw tightening device 9 of each roll pair 44,45 (FIG. 7) is connected to the connecting rod pin 3 (the eighth It is fixed in the vertical direction by a beam 46 attached to the end of the figure.

The roll of the work stand according to the invention is mounted and set up as follows.

The movable housing 2 stops midway through its travel distance (FIG. 1), the cover 39 opens (FIG. 2), and the fluid cylinder 1
8 (FIG. 3) is actuated, the rod of the fluid cylinder 18 rises, and the fixed nozzle 1 housing 1 and turntable 1
The wedge lock 17 is pulled out of the slot formed by 5. The turntable 15 is connected to the rack 12 and cover 39 of the rack and pinion drive device for the roll 6 (
(FIG. 2) by 80-100° relative to the fixed housing l around the axis 16 (FIG. 3), thereby
Access to the working space of the fixed housing 1 is made possible. Cover 40 (FIG. 2) is moved to the right. roll 5
To release the chock 7 of the compactor 8 nut 2
4 (FIG. 3) and move the movable wedge 20 of pair B downward together with the stud 23. When the movable wedge 20 moves downward, the guide 26 prevents the movable wedge 20 from being pulled out of the inclined surface of the fixed wedge 19, and at the same time prevents the movable wedge 20 from being pulled out from the inclined surface of the fixed wedge 19 by the projection 22 (FIG. 4) fitted in the slot 21. The movable wedge 20 is moved vertically and the movable wedge 20 is raised relative to the fixed wedge 19 (co
cking) is prevented. As a result, a guaranteed gap of 1 to 3 mm is created between the lower chock and the movable wedge 20.

Next, the movable wedges 20 of pair A are moved upwards by means of a setting (not shown). The setting screw is screwed into the threaded hole 47 of the movable wedge 20 and is held against the wedge 19 as in pair B. As a result,
A guaranteed gap of 1 to 3 mm is formed between the chock 7 above the roll 5 and the movable wedge 20. In the same way, the roll 6 is freed from the action of the chock 7 or the compactor 8.

To create a guaranteed gap between the screw tightening device 9 of the roll 6 and the chock 7, loosen the locking nut 35 of pair C (FIG. 5) and turn the pressure screw 32, so that the lock nut 35 of pair C, D
Orient the movable wedge 29 in the opposite direction. Fixed wedge 28
The position of the movable wedge 29 relative to the slot 30 of the strip 36 (second
) is prevented from being pulled out of the inclined surface of the fixing wedge 28 according to the method described for the pair A, B of the compactor 8. As a result, the upper and lower chocks 7 of the roll 6
A gap is formed between the movable wedges 29 of pairs C and D.

When the gap between the movable wedge 29 of the screw tightening device 9 and the roll chock is 3 to 5+ nm, the bolt 4 of the bar 14
3 is loosened and the rotary handling machine (load
-handling machine) or any other device, the pairs of rolls 5.6 are pulled out of the movable housing. The compactor 8 and screwing device 9 remain fixed to the movable housing.

Before stopping the rolling mill, a new pair of similar rolls 5.6 is assembled while being advanced away from the rolling mill in the following manner.

Bar 14 is arranged upright (not shown)1. The new roll 5.6 is fixed to the bar 14. roll 5
is adjusted axially relative to the roll 6 by means of a setting screw (not shown).

This allows access to the channel groove. Next, a set of adjusting shims 42 of the desired thickness is placed between the chock 7 of the roll 5 and the bar 14, and the bolts 41 of both rolls 5.6 are tightened. The roll pairs pre-assembled in this way are assembled by a load lifting mechanism (LOA) after the used upper roll pair is pulled out of the housing.
d-1 lifting mechanism) into the movable housing 2. The gaps are then removed by a compactor 8 for both rolls simultaneously or separately.

A setting screw (not shown) is removed from the screw hole 47 of the person's movable wedge 20. The nut 24 is then rotated along the stud 23 to bring the movable wedges 20 of the pair A, H together with the fixed wedge 19 of the pair A, B. The nut 24 has a movable wedge 20 with a chock 7 of roll 5.6.
rotated until it is in close contact with the

As a result, the roll chocks are maintained in a position with no gaps, so they are not subjected to vibration or large wear during operation. The next step is to tighten the bolts 43 to tighten the intermediate bar 14.
(Figure 2).

Next, the screw tightening device 9 is used to adjust the radial gap between the rolls. By rotation of the screw 32, both rolls 5.
6 until the required gap is set between screw tightening devices 9
Both movable wedges 29 of the wedge pair C, D are brought closer to each other. If the gaps between the rolls on the upper and lower sides of the wedge of the screw tightening device 9 are different,
These gaps should be further adjusted by bushings 33.

For this purpose, the screw 32 (FIG. 5) is held in place and the bushing 33 is rotated to move the movable wedge of pair C to equalize the roll gap.

Next, the lock nut 35 is tightened, and when the stand is operated, the gap between the two rolls 5.6 can be adjusted by retracting the lock nut 35 and rotating only the setting screw 32. After this adjustment, the cover 40 (FIG. 2) is moved rearward to a predetermined position, and the turntable 15 is rotated to its original position. This brings the rack 12 into engagement with the pinion 13, actuating the fluid cylinder 18 (FIG. 3) and moving the wedge lock 17.

This wedge lock 17 enters a slot between the turntable 15 and the fixed housing 1, and the turntable 15 is rotated relative to the fixed housing 1. Next, by lowering the cover 39 (FIG. 2), the stand is ready for operation. Connecting rod 4 from the drive mechanism
A reciprocating movement is transmitted to the movable housing 2 via the movable housing 2, and an oscillating movement is transmitted to the work roll 5.6 by means of a drive pinion 1113 rotating on the rack l0112.

A work stand with a movable housing consisting of two pairs of rolls (FIGS. 6, 7 and 8) operates on the same principle. Both stands can be used for jingle stand rolling and double stand rolling.

(Effects of the Invention) Compared to known devices, the work stand designed according to the invention can improve roll mounting and setting accuracy and stand maintenance requirements, and can significantly reduce the time required for changing and setting rolls. Therefore, the output of the rolling mill can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view of a work stand of a cold tube rolling mill according to the present invention. FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1,
For convenience, it is shown in different directions. FIG. 5 is a cross-sectional view taken along line 1--v in FIG. 1, and is shown in a different direction for convenience. FIG. 6 shows a movable housing with two pairs of rolls offset from each other in a vertical plane. FIG. 7 shows the structure of the screw tightening device. FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. DESCRIPTION OF SYMBOLS 1... Fixed housing, 2... Movable housing, 3... Pin, 4... Connecting rod, 5.6... Vertical roll, 7... Chock, 8... Compactor, 9. ... Wedge-shaped screw tightening device for adjusting roll gap, 1
0...Rack, 11...Pinion, 12
...Rack, 13...Pinion, 14.
...Bar 15...Turntable, 16
...Shaft, 17...Wedge lock, 1
8... Fluid cylinder, 19... Fixed wedge, 2
0... Movable wedge, 21... Longitudinal slot, 22... Longitudinal protrusion, 23... Stud,
24.25...Natsuto, 26...Guide, 27
...Bolt, 28...Fixing wedge, 29
... Movable wedge, 30... Longitudinal slot, 31... Longitudinal protrusion, 32... Screw, 33...
...Bush, 34...Natsuto, 35...
Lock nut, 36...Guide, 37...Bolt, 38...Boss, 39.40...Cover 41...Bolt, 42...Adjustment shim,
43... Bolt, 44.45... Roll pair, 46... Beam, 47... Hole, A and B,
C and D...pair of wedges.

Claims (4)

[Claims] (1) having a fixed housing (1), a movable housing (2) with a pin (3) for attaching a connecting rod (4) of a stand drive, and at least one pair of vertical rolls (5, 6); and the vertical rolls (5, 6)
chocks (7) and vertically fixed racks (10
, 11) and pinions (
In the work stand of a cold tube rolling mill, the work stand of a cold tube rolling mill is equipped with a rack and pinion drive device consisting of the rolls (5 , 6), a bar (14) is provided interconnecting the upper chocks (7) of the pairs, said bar (14) being arranged in the movable housing (2), the turntable (15) being one end of the turntable (15) is connected to a vertical shaft (16).
is fixed to the fixed housing (1) via
The other end of the turntable (15) is fixed to the fixed housing (1) via a movable wedge lock (17), and the turntable (15) is connected to the pair of rolls (5, 6). It supports the rack (12) of the rack and pinion drive of one of the rolls, which rack (12) supports the rack (12) of the rack and pinion drive of the other roll of the pair of rolls (5, 6). 10)
A wedge-shaped compactor (8) is arranged between the chock (7) of each roll and the movable housing (2);
A work stand for a cold tube rolling mill, characterized in that the stands are interconnected so as to allow joint movement toward each other. (2) Wedge-shaped compactor (8) of the chock (7)
and the wedge-shaped screw tightening device (9), each of which
Each is configured in the form of two pairs (A, B and C, D) of wedges arranged vertically opposite each other, with each wedge in each pair (A, B and C, D) (19, 20 and 28, 29) are in contact with each other on an inclined surface, one of said wedges (19 or 28) is fixed to said movable housing (2) and a longitudinal slot (21 or 30) and guide (26 or 36
), the guide (26 or 36) is arranged on the inclined surface and the movable wedge (20 or 29
), the movable wedge (20 or 29) enclosing the longitudinal slot (2
1 or 30), the longitudinal projections (22 or 31) being fitted in the two
2. Refrigerator according to claim 1, characterized in that the movable wedges (20 or 29) in two pairs (A, B and C, D) are interconnected by screw-nut pairs to allow joint movement. Inter-tube rolling machine work stand. (3) The screws (32) of the screw-nut pair of each wedge-shaped screw tightening device (9) are attached to the connecting rod (4).
The working stand of a cold tube rolling mill according to claim 2, characterized in that it is arranged vertically on the pin (3) for mounting. (4) The pin (3) of the connecting rod (4)
is press-fitted into a boss (38) provided on the movable housing (2) in a vertical plane passing through the center of gravity of the movable housing (2).
and 2. A work stand for a cold tube rolling machine according to 2.