JP3150907B2 - Chock fixing device for lower intermediate roll of hexahedral mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rearrangement of rolls in a six-roll mill used in a hot rolling process or the like, and movement of a lower intermediate roll of the six-roll mill in the direction of a pass line. The present invention relates to a chock fixing device for a lower intermediate roll of a hexalayer rolling mill provided with a rearrangeable rail for rearranging rolls.

[0002]

2. Description of the Related Art As a method of changing a work roll and an intermediate roll in a six-rolling mill, a method of pulling out a set of upper and lower work rolls and an intermediate roll in a four-stage stack as a lump from a rolling housing is usually used. is there.

In this method, a special rearrangement rail is provided below the lower intermediate roll, and the rearrangement roll is moved up and down at the time of rearrangement, so that a turntable or a work table equipped on the work side is provided. According to the height of the side shift device, a set of four rolls is extracted and assembled.

[0004] However, in this four-stage roll change method, even when only the upper and lower work rolls are changed, it is necessary to change the lower intermediate roll that does not need to be changed at the same time.

[0005] In addition, the rolling housing is provided with a re-arrangement rail dedicated to a work roll and a re-arrangement rail dedicated to a lower intermediate roll, and a work-side turntable and a side shift device are installed in a rolling mill. For each rail height of
A method of changing the rolls by adjusting the lifting and lowering is also conceivable, but it becomes a very complicated device such as a height adjusting mechanism for raising and lowering the turntable and the side shift device is required.

On the other hand, only the upper and lower work rolls, the upper and lower work rolls, the upper intermediate roll, the upper and lower Rolling mills that can be re-arranged with an arbitrary combination of rolls among three combinations of a work roll and a lower intermediate roll have appeared.

[0007] In this type of rolling mill, as shown in Fig. 4 as viewed from the roll axis direction, a rail support member 51 is provided in a rolling housing 50, and the rail support member 51 includes a lower intermediate roll 52 and a lower intermediate roll 52. Chock 5 for 52
3 is arranged in parallel with the roll axis so as to face the pass line direction (only one side is shown in FIG. 4).

A rearrangement rail 55 for the lower work roll 54 is provided on the upper surface of the rail support member 51, and the rearrangement rail 55 extends in parallel with the roll axis. A concave portion 51a having a U-shaped vertical section is formed below the rail support member 51, and a rearrangement rail 56 for the lower intermediate roll 52 is provided on a lower surface in the concave portion 51a. Rearrangement rail 56 for the lower intermediate roll 52
Are also extended parallel to the axis of the roll.

The rail support member 51 is vertically movably guided by a guide portion 50a provided in the rolling housing 50, and is vertically movable by a cylinder device 57.

In FIG. 4, reference numeral 58 denotes a lower work roll 54.
Chocks 59, wheels for the lower work roll 54, 6
0 indicates wheels for the lower intermediate roll 52, respectively.
Then, for example, the upper surface of the rail support member 51 is moved up and down to a common rail for replacement, and is adjusted.
Then, the inner lower surface of the concave portion 51a of the rail support member 51 is raised to the rearranging rail surface, and the lower intermediate roll 52 is pulled out along the rearranging rail 56 for the lower intermediate roll 52. Do.

Thus, the work roll 54 and the lower intermediate roll 52 can be replaced on the common rail surface without changing the height of the work-side turntable or the side shift.

Further, in the above-described rearrangement method, the upper side surface 51b of the rail support member 51 faces the chocks 53 for the lower intermediate roll 52 in the pass line direction with a predetermined gap δ1, and the lower intermediate roll 52 Is restricted in the direction of the pass line.

[0013]

However, in the rail support member 51 in the above-described rearrangement method, the rearrangement rail 56 for the lower intermediate roll 52 moves to the position of the common rearrangement rail surface. In addition, as a result of being able to move up and down along the rolling housing 50, there is a play δ2 in the pass line direction between the rail support member 51 and the rolling housing 50.

As a result, during rolling, the lower intermediate roll 52
Is such that in addition to the gap δ1 between the chocks 53 for the lower intermediate roll 52 and the rail support member 51, the play δ2 between the rail support member 51 and the rolling housing 50 can also be displaced in the pass line direction. Therefore, there is a problem that the accuracy of restraining the chock 53 for the lower intermediate roll 52 in the direction of the pass line is increased, and the sheet passing becomes unstable (squeezing).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a lower intermediate roll chock fixing device that improves the restraining accuracy of the lower intermediate roll chock.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a chock fixing device for a lower intermediate roll of a six-roll mill according to the present invention restrains the lower intermediate roll chock in a pass line direction and lowers a work piece. A choke fixing device for a lower intermediate roll of a hexa-rolling mill, comprising: a rail support member having a rail for rearranging a roll and a lower intermediate roll; and elevating means for vertically moving the rail support member. The member is fixed to the rolling housing at a portion that can oppose the lower intermediate roll chock in the pass line direction,
It is characterized in that only the other parts can be raised and lowered independently.

In the present invention, the portion that can oppose the lower intermediate roll chock in the pass line direction is fixed to the rolling housing. Therefore, when the lower intermediate roll chock is constrained in the pass line direction, the rail support member and the rolling support are fixed. The play with the housing is set to zero.

Further, since the other rail supporting members can be raised and lowered, the lower work roll and the lower intermediate roll can be shared as in the related art by supporting the wheels for the lower intermediate roll at the liftable portion. Can be moved up and down to the rail surface for replacement.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a schematic configuration diagram viewed from the roll axis direction, FIG. 2 is a schematic configuration diagram viewed from the pass line direction, and FIG. 3 is a schematic configuration diagram viewed from above (the upper portion of the rail support member main body is omitted).

First, the overall configuration of the rolling mill will be briefly described. Work rolls 2 and 12 and intermediate rolls 3 and 1 are arranged in a rolling housing 1 in a vertical direction across a pass line.
3 and a backup roll 4 are provided. In FIG. 1, only the lower roll is shown.

Chockes 5, 6, 7 are provided at both ends of each roll, and the rolls are constrained by the chocks 5, 6, 7 being supported by the rolling housing 1.

Each of the chocks 5, 6, and 7 is provided with a wheel for replacement. As shown in FIG. 2, the wheel 11 provided on the lower intermediate roll chock 6 is disposed inward of the roll shaft with respect to the position of the chock 6, and the wheel support member 14.
Is connected to the chock 6 via a. In the figure, 15 is
The wheel for the lower work roll 2 is shown.

In addition, the main intermediate roller chock fixing device according to the present embodiment includes a rail support member 8 and a cylinder device 16 as an elevating means for elevating the rail support member 8 as main components.

The rail support member 8 is arranged to extend between the lower intermediate roll 3 and the chocks 6 for the lower intermediate roll 3 and the rolling housing 1 in the pass line direction P (only one side in FIG. 1). Is illustrated).

The rail support member 8 includes two fixed block portions 9 facing each chock 6 and a rail support member main body 10 disposed between the two fixed block portions 9 and capable of facing the lower intermediate roll 3. Has been split.

The left and right fixed block portions 9 are respectively fixed to the rolling housing 1 and face the lower intermediate roll chock 6 in the pass line direction P with a predetermined gap δ1 therebetween, and a rail surface is formed on the upper surface thereof. On the rail surface, a common rearranging rail 17 is laid in the roll axis direction. In FIGS. 2 and 3, the right fixed block is the working side, and the left fixed block is the drive side.

The rail supporting member main body 10 is a member having a U-shaped vertical cross section with a concave portion facing the chock 6 side, a rail surface is formed on an upper surface thereof, and a set for the lower work roll 2 is formed on the rail surface. A replacement rail 18 is laid. Both ends of the rearranging rails 18 can be connected to the respective common rearranging rails 17 of the fixed block section 9.

A rail surface is also formed on the lower surface in the concave portion of the rail support member main body 10, and a rearrangement rail 19 for the lower intermediate roll 3 is laid on the rail surface in the roll axis direction. The rearrangement rail 19 for the lower intermediate roll 3 is
By moving the rail support member body 10 upward, the rail support member main body 10 can be connected to the common rearranging rails 17 of the fixed block portion 9 at the same height.

The rail support member main body 10 is vertically movably guided by a guide portion 1a provided on the rolling housing 1, and is vertically movable by a cylinder device 16.

In FIG. 2, reference numeral 1b denotes a rolling housing 1.
And a contact portion with the rail support member main body 10 provided at the first position, and contacts the lower surface of the rail support member main body 10 installed at a fixed position to support the rail support member main body 10.

Next, the operation and the like of a rolling mill provided with the lower intermediate roll chock fixing device having the above configuration will be described. When the lower work roll 2 is extracted in the above-described six-high rolling mill, the height of the rearrangement rail 18 for the lower work roll 2 of the rail support member main body 10 is provided on the fixed block portion 9. After adjusting by raising and lowering to the same height as the common rearranging rail 17, the wheels 15 for connecting the lower work roll 2 on the rearranging rail 18 and the common rearranging rail 17 to the lower work row chock 5 are moved. The lower work roll 2 is pulled out by running and moved to a work-side turntable (not shown) or the like.

Subsequently, when the lower intermediate roll 3 is to be extracted, the rail supporting member main body 10 is raised, and the wheels 11 connected to the lower intermediate roll chock 6 are placed on the lower intermediate roll changing rail 19. The height of the rearrangement rail 19 for the lower intermediate row 3 is placed on the fixed block 9 as it is.
Until it is the same height as the common rearranging rail 17 provided in
Further, the rail support member main body 10 is raised.

Next, the lower intermediate roll 3 is run on the lower intermediate roll changing rail 19 and the common
From the rolling housing 1 and moved to a work-side turntable or the like.

Incorporation of the roll is performed by performing the operation opposite to the above operation. As a result, as before,
The lower work roll 2 and the lower intermediate roll 3 can be extracted and assembled at the same height without having a height adjusting mechanism for a device such as a turntable on the working side.

The lower work roll 2 and the lower intermediate roll 3
When the rolling operation is performed by incorporating the upper and lower work rolls 2, 1
Rolling of a material to be rolled such as a steel plate biting between the two is performed.

At the time of this rolling, the lower intermediate roll 3 tries to move in the pass line direction P under the load in the pass line direction P, but the lower intermediate roll chock 6 hits the fixed block portion 9. Touching restricts further movement.

At this time, in the present embodiment, since the fixed block portion 9 is fixed to the rolling housing 1 in a state in which it cannot move, even if it receives a load in the pass line direction P from the lower intermediate roll chock 6. Never move like.

As a result, the play of the lower intermediate roll 3 at the time of rolling is reduced as compared with the related art, and the instability of the threading is less likely to occur as compared with the related art.
Further, since the load at the time of rolling is not input to the rail supporting member main body 10, which is a movable portion, the durability of the device is improved and the maintenance interval of the device can be lengthened.

[0039]

EXAMPLE In fact, the ratio of replacement due to an abnormality of the lower intermediate roll 3 was reduced from 0.2% in the past to 0.2%. This is presumably because the play of the lower intermediate roll 3 in the pass line direction P was reduced.

The mechanical failure rate of the device is 0.2%
Was 0.0%. This is because a portion (fixed block portion 9) that receives a load during rolling from the lower intermediate roll chock 6 is fixed to the rolling housing 1, and a load during rolling is not input to the movable portion (rail supporting member body 10). It seems that it became. here,
The machine failure rate refers to (machine failure time) / (rolling work time).

From the above results, the replacement cost of the lower intermediate roll 3 is increased, and the failure of the rolls and the devices is reduced, so that the repair cost is reduced.

[0042]

As described above, when the chock fixing device for the lower intermediate roll of the six-layer rolling mill of the present invention is employed, the play of the lower intermediate roll in the pass line direction during rolling is smaller than in the past. Thus, there is an effect that the threading instability is reduced as compared with the related art.

Further, since the load during rolling is not applied to the movable portion of the fixed device, the durability of the device is improved, and there is also an effect that the maintenance cost is reduced, for example, the failure is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a chock fixing device for a lower intermediate roll according to an embodiment of the present invention as viewed from a roll axis direction.

FIG. 2 is a schematic configuration diagram showing a chock fixing device for a lower intermediate roll according to an embodiment of the present invention, viewed from a pass line direction P.

FIG. 3 is a schematic configuration diagram showing a chock fixing device for a lower intermediate roll according to an embodiment of the present invention as viewed from above.

FIG. 4 is a schematic configuration diagram showing a conventional lower intermediate roll chock fixing device as viewed from the roll axis direction.

[Explanation of symbols]

 P Pass line direction 1 Rolling housing 2 Lower work roll 3 Lower intermediate roll 4 Lower backup roll 5 Chock for lower work roll 6 Chock for lower intermediate roll 8 Rail support member 9 Fixed block 10 Rail support member body 11 Lower intermediate roll Wheels for lower work rolls 16 Wheels for lower work rolls 16 Cylinder device 17 Rails for common rearrangement 18 Rearrangement rails for lower work roll 19 Rearrangement rails for lower intermediate roll

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21B 31/02 B21B 13/14 B21B 31/10

Claims (1)

(57) [Claims] 1. A rail support member having a lower work roll and a lower intermediate roll reassignment rail for restraining a lower intermediate roll chock in a pass line direction, and elevating means for vertically moving the rail support member up and down. The chock fixing device for a lower intermediate roll of a six-layer rolling mill comprising: A chock fixing device for a lower intermediate roll of a six-layer rolling mill, which can be moved up and down.