JPH06262222A - Mill - Google Patents

Abstract

PURPOSE:To obtain a high-quality rolled product automatically and efficiently when a short material etc., is rolled. CONSTITUTION:1st and 2nd reversal revolution changeable pinch rolls 35, 45 are mounted before and behind a mill body 15. When a work W is sent from the side of the 1st pinch roll 35 into between rolling rolls 12,113, a controller to control the pinch rolls 35, 45 controls the speed of the 1st pinch roll 35 so that it is slower than those of the rolling rolls 12, 13 and controls the speed of the 2nd pinch roll 45 so that it is faster than those of the rolling rolls 12, 13. When the work W is sent from the side of the 2nd pinch roll 45 into between rolling rolls 12, 13, the speed of the 2nd pinch roll 45 is controlled so that it is slower than those of the rolling rolls 12, 13 and the speed of the 1st pinch roll 35 is controlled so that it is faster than those of the rolling rolls 12, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill suitable for rolling short material.

[0002]

2. Description of the Related Art When rolling a work with a rolling mill,
Good results can be obtained by rolling the work with back tension. Therefore, for example, in the case of a long strip-shaped work such as a coil, rolling the work while stretching the work between the drum for supplying the work and the rolling roll has a certain effect. Further, in the case of a work that cannot be wound on a drum like a short material, an auxiliary work such as a worker applying back tension to the work using a jig may be performed at the entrance side of the rolling roll. .

[0003]

However, not only is it dangerous for a worker to apply tension using a jig during rolling, it is also a heavy labor and requires skill.
Efficiency is also poor. In particular, when repeating the work of gradually narrowing the gap of the rolling rolls while alternately switching the feed direction of the work, such as when rolling a short strip thinly, a worker must be placed before and after the rolling rolls. This is an obstacle to labor saving. Therefore, it has been desired to develop a rolling mill capable of efficiently rolling even a short material.

Therefore, an object of the present invention is to roll, for example, a short material, in which a work can be automatically tensioned while the feed direction is alternately changed while tension is applied to the work, without relying on human labor. An object of the present invention is to provide a rolling mill capable of efficiently rolling and obtaining high-quality rolled products.

[0005]

A rolling mill of the present invention developed to achieve the above object has a rolling mill main body having a rolling mill stand and rolling rolls, and a motor for rotating the rolling rolls. And a rolling roll drive mechanism capable of rotating the rolling roll in either forward or reverse directions, and a first pinch member and a second pinch member, which are respectively arranged before and after the rolling roll and sandwich the work in the thickness direction. A pinch member, a first drive source capable of rotating the first pinch member in either forward or reverse directions, and capable of changing the rotation speed of the first pinch member; Of the first pinch member and a second drive source capable of rotating the pinch member of FIG. 2 in either forward or reverse directions and changing the rotational speed of the second pinch member. The first driving source is controlled so that the speed of the first pinch member is slower than the peripheral speed of rotation of the rolling roll when the second pinch member is fed from the peripheral part to the peripheral roll of the rolling roll. The second drive source is controlled so as to be faster than that, and when the work is fed from the second pinch member side to the rolling roll, the speed of the second pinch member is made slower than the rotational peripheral speed of the rolling roll. And the controller that controls the first drive source so that the speed of the first pinch member is faster than the peripheral speed of rotation of the rolling roll and the work passes between the rolling roll. And a work passage detecting means for detecting the end.

[0006]

Since the rolling roll and the first and second pinch members can be rotated in either forward or reverse directions,
The work can be rolled from either the front or the back of the rolling mill body. For example, when the work is sent from the first pinch member side to the rolling roll, control is performed so that the speed of the first pinch member located on the roll inlet side is slower than that of the rolling roll and the second pinch member located on the roll outlet side. Is controlled so that the speed of the pinch member is faster than that of the rolling roll. For this reason, back tension is applied to the work by the first pinch member, and a force for drawing the work from the rolling roll is exerted by the second pinch member.
That is, tension is applied from both the front and back of the work,
The fluttering of the work is prevented, the work is extended well, and the flatness is improved, so that the rolling property is dramatically improved.

The work passes between the rolling rolls and the second
When the work comes out to the pinch member side, the work passage detecting means detects that the rolling for one pass is completed.
After that, the rolling roll and the pinch member are rotated in reverse.
In that case, conversely to the above, control is performed such that the speed of the second pinch member on the roll inlet side is slower than that of the rolling roll, and the speed of the first pinch member on the roll outlet side is set to be lower than that of the rolling roll. Speedy control is performed. Therefore, even when rolling is performed in this direction, it is possible to perform rolling with tension applied from both front and rear directions of the work. In this way, by gradually changing the feed direction of the work and gradually narrowing the interval between the rolling rolls, it is possible to automatically roll until the desired plate thickness is reached.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Rolling mill 10 shown in FIG.
Is provided with a rolling mill stand 11 and rolling mill main bodies 15 having rolling rolls (work rolls) 12 and 13 similar to a normal rolling mill, and a work (material to be rolled) W is placed between the rolling rolls 12 and 13. It is designed to pass through. Rolling roll 1
2, 13 are supported by back rolls 16 arranged above and below the rolls.

The number of back rolls 16 is not limited to a pair of upper and lower rolls, and may be a multi-stage rolling mill having two or more back rolls. Before and after the rolling mill main body 15, tables 17 and 18 such as shelves for guiding the movement of the work W along the pass line are provided. A roller conveyor may be used for the tables 17 and 18 as needed. The tables 17 and 18 and the rolling mill stand 11 are provided on a rolling mill bed 19.

A rolling mechanism 20 is provided on the upper part of the rolling mill stand 11.
Is provided. The rolling-down mechanism 20 includes a rolling-down actuator 21 such as a motor, and a load cell 22 as an example of a rolling-down load detection sensor. The rolling-roll 12 has a desired rolling-down load based on a predetermined rolling schedule. The distance between the rolling rolls 12 and 13 can be variably set.
A hydraulic cylinder may be adopted as the actuator 21.

The rolling rolls 12 and 13 have a main motor 25 as shown in FIG.
By means of 6, it is possible to rotate in both forward and reverse directions. The rotating force of the main motor 25 is transmitted to the rolling rolls 12 and 13 via the power transmission mechanism 27, the universal joint 28, etc., and the rolling rolls 12 and 13 are rotated in the rotation direction according to the feed direction of the workpiece.

As shown in FIG. 4, a first pinch roll mechanism 30 is provided on the left side of the rolling mill body 15 in the drawing. The pinch roll mechanism 30 includes an upper pinch roll unit 31, a lower pinch roll unit 32,
Each of the pinch roll units 3 is provided with a lifting drive mechanism 33 using a hydraulic cylinder or the like capable of raising the upper pinch roll unit 31 to a desired height.
1, 32 are provided with a pinch roll 35 as an example of a first pinch member.

The pinch roll 35 provided on the upper pinch roll unit 31 and the lower pinch roll unit 3
The pinch rolls 35 provided on the No. 2 face each other so that the work can be sandwiched in the plate thickness direction. In the illustrated example, three pinch rolls 35 are provided on the upper and lower sides, but the number of pinch rolls 35 may be at least one on the upper and lower sides, and is not limited to the illustrated example. Each pinch roll 35 is rotated in the same direction at the same peripheral speed by an appropriate interlocking mechanism 36 using a gear, a chain, a belt or the like.

A second pinch roll mechanism 40 is provided on the right side of the rolling mill body 15 in the figure. The pinch roll mechanism 40 includes an upper pinch roll unit 41,
The pinch roll unit 42 on the lower side and the lifting drive mechanism 43 using a hydraulic cylinder or the like capable of raising the upper pinch roll unit 41 to a desired height are provided, and each pinch roll unit 41, 42 is provided with a first A pinch roll 45 as an example of the second pinch member is provided. Each pinch roll 45 is rotated in the same direction at the same peripheral speed by an appropriate interlocking mechanism 46 using a gear, a chain, a belt, or the like.

As shown in FIG. 1, the first pinch roll 35 can be rotated in either forward or reverse directions by a first drive source 50 using a motor or the like. As the drive source 50, for example, a drive source capable of controlling the rotation speed by an inverter or the like is adopted so that it can be rotated at at least two kinds of speeds. The rotational force of the drive source 50 is, for example, the power transmission mechanism 5 such as the winding transmission bodies 51 and 52, the clutch 53, the idle gear 54, and the like.
5 is transmitted to the pinch roll 35.

The second pinch roll 45 can be rotated in either forward or reverse directions by a second drive source 60 using a motor or the like. The drive source 60 also employs a drive speed controllable by, for example, an inverter so that it can be rotated at at least two types of speeds. The rotational force of the drive source 60 is transmitted to the pinch roll 45 via the power transmission mechanism 65 such as the winding transmission bodies 61 and 62, the clutch 63 and the idle gear 64, for example.

Each of the pinch roll mechanisms 30 and 40 is controlled by a controller 70 using a microcomputer or the like, in accordance with the feed direction of the work W, the pinch rolls 3 respectively.
The rotation directions and the feed rates of 5, 45 are controlled. The controller 70 is housed in, for example, the control panel 71 shown in FIG. 2 or the like, but may be provided at a position apart from the rolling mill main body 15 via an electric cable (not shown).

The controller 70 includes a sequencer for executing the processing illustrated in FIG. That is, the controller 70 is configured to move the work W in the direction of arrow A in FIG.
Is fed, the first drive source 50 is controlled so that the speed of the first pinch roll 35 becomes slower than the peripheral speed of rotation of the rolling rolls 12 and 13, and the speed of the second pinch roll 45 rolls. The second drive source 60 is controlled so as to be faster than the rotational peripheral speed of the rolls 12 and 13. Further, when the work W is fed in the direction of the arrow B, the second drive source 60 is controlled so that the speed of the second pinch roll 45 becomes lower than the peripheral speed of rotation of the rolling rolls 12 and 13, and The first drive source 50 is controlled so that the speed of the pinch rolls 35 is faster than the rotational peripheral speed of the rolling rolls 12 and 13.

The load cell 22 also serves as a work passage detecting means 75 for detecting that the work W has finished passing between the rolling rolls 12 and 13. That is, since the predetermined reduction load is detected by the load cell 22 while the work W is being rolled by the rolling rolls 12 and 13, the work W moves between the rolling rolls 12 and 13 when the reduction load is no longer detected. It can be determined that the object has passed through, and the signal (work passage detection signal) output at that time is input to the controller 70.
Therefore, in this case, it is not necessary to separately provide a sensor for detecting the passage of the work, and the structure can be simplified. A sensor for detecting the passage of the work using a photocell or the like may be provided in the rolling mill body 15.

Next, the operation of the rolling mill 10 having the above structure will be described. In FIG. 1, the work W is rolled into rolling rolls 12, 1
When starting the rolling by feeding from the left side of 3 (direction of arrow A), the main motor 25 is driven so that the rolling rolls 12 and 13 rotate in this direction, and the driving source so that the work W moves in this direction. The first pinch roll 35 and the second pinch roll 45 are rotated by 50 and 60. Moreover, in this case, the rotation is controlled so that the speed of the first pinch roll 35 on the roll inlet side is slower than the speed of the rolling rolls 12 and 13, and the speed of the second pinch roll 45 on the roll outlet side. Rolling roll 1
The control is performed so as to be faster than 2 and 13.

Therefore, in this case, the first pinch roll 35
Work W sent to rolling rolls 12 and 13 by
The back tension is applied by the first pinch roll 35, and a force is applied by the second pinch roll 45 in the direction of being pulled out from the rolling rolls 12 and 13. That is, since the rolling is performed in a state in which tension is applied from both front and rear directions of the work W, the work W extends well and the flatness is improved.

When the work W has finished passing between the rolling rolls 12 and 13 and completely exiting to the side of the second pinch roll 45,
Since the reduction load that has been detected by the load cell 22 is no longer detected, it can be seen that the rolling for one pass is completed based on the change in the reduction load. By inputting this work passage detection signal to the controller 70, the rotation of the rolling rolls 12 and 13 and the pinch rolls 35 and 45 is once stopped by the controller 70, and then the rolling rolls 12 and 13 and the pinch rolls 35 and 45 are stopped. Is rotated in reverse. Further, the reduction mechanism 20 is driven so that the interval between the rolling rolls 12 and 13 is narrowed based on a predetermined rolling schedule.

The work W moves in the B direction by the reverse rotation of the rolling rolls 12 and 13 and the pinch rolls 35 and 45 as described above. In this case, since the second pinch roll 45 is on the roll inlet side and the first pinch roll 35 is on the roll outlet side, the speed of the first pinch roll 35 is made faster than the speed of the rolling rolls 12 and 13, and The speed of the second pinch roll 45 is set to the rolling roll 12,
The control is performed by the controller 70 so as to be slower than 13. Therefore, also in this B-direction rolling, it is possible to perform rolling with tension applied from both front and rear directions of the work W, and good rolling with high flatness is performed.

The above series of steps can be automatically executed by using the controller 70, and rolling is performed while the work W is alternately fed in the A direction and the B direction based on a predetermined rolling schedule. At the same time, the distance between the rolling rolls 12 and 13 is gradually narrowed, and the rolling is completed when the rolling is finished to a desired thickness. The outline of the above steps is shown in FIG.

The upper pinch roll units 31 and 41 are moved up and down depending on the thickness of the work W.
By pushing the work W up and down, the pressing force is adjusted so as to sandwich the work W with an optimum force. In addition, at the time of maintenance and inspection or when foreign matter is caught, the upper pinch roll unit 31,
By raising 41 by the lifting drive mechanisms 33 and 43, the gap can be widened significantly.

According to the present invention, the pinch member 81 using the winding transmission body such as the endless belt 80 as shown in FIG.
82, the pinch roll mechanisms 30, 4 of the above embodiment
You may make it have the same function as 0. Belt 8
For 0, an elastic body having a large friction coefficient, such as urethane rubber, is suitable, but any material can be used as long as it can sandwich the work and apply the above-mentioned tension.

Further, in carrying out the present invention, it goes without saying that the embodiment of the components of the rolling mill can be variously modified without departing from the scope of the present invention, and the present invention is not limited to the above-mentioned embodiments. Needless to say. Further, the rolling mill of the present invention can be used not only for rolling a short material but also for rolling a long strip-shaped work such as a coil.

[0028]

EFFECTS OF THE INVENTION According to the present invention, even a short material can be rolled efficiently and in a state where tension is applied, and in order to automate the rolling operation and obtain a high-quality rolled product. It has a great effect.

[Brief description of drawings]

FIG. 1 is a side view of a rolling mill showing an embodiment of the present invention.

2 is a front view of the rolling mill shown in FIG. 1. FIG.

3 is a flowchart showing an example of control by a controller of the rolling mill shown in FIG.

FIG. 4 is a side view of a part of the rolling mill shown in FIG.

FIG. 5 is a side view showing a modified example of the pinch member.

[Explanation of symbols]

10 ... Rolling mill, 11 ... Rolling mill stand, 12, 13 ... Rolling rolls, 15 ... Rolling mill body, 20 ... Rolling down mechanism, 22 ...
Load cell, 25 ... motor, 26 ... rolling roll drive mechanism, 35 ... first pinch roll (first pinch member),
45 ... Second pinch roll (second pinch member), 50
... first drive source, 60 ... second drive source, 70 ... controller, 75 ... work passage detecting means, 81 ... first pinch member, 82 ... second pinch member.

Claims (2)

[Claims] 1. A rolling mill drive having a rolling mill main body having a rolling mill stand and rolling rolls, and a motor for rotating the rolling rolls, which can rotate the rolling rolls in either forward or reverse directions. A mechanism, a first pinch member and a second pinch member which are respectively arranged before and after the rolling roll and sandwich the work piece in the thickness direction, and the first pinch member is rotated in both forward and reverse directions. And a first drive source capable of changing the rotation speed of the first pinch member, and the second pinch member capable of rotating in both forward and reverse directions and the second A second drive source capable of changing the rotation speed of the pinch member, and when the work is fed from the first pinch member side to the rolling roll, the speed of the first pinch member is rolled. The first drive source is controlled so as to be slower than the rotational peripheral speed of the rolling roll, and the second drive source is controlled so that the speed of the second pinch member is faster than the rotational peripheral speed of the rolling roll. Further, when the work is fed from the second pinch member side to the rolling roll, the second drive source is controlled so that the speed of the second pinch member is slower than the peripheral speed of rotation of the rolling roll, and the first drive source is controlled. A controller for controlling the first drive source so that the speed of the pinch member is faster than the rotational peripheral speed of the rolling rolls; and a work passage detecting means for detecting that the work has finished passing between the rolling rolls. A rolling mill characterized by being equipped. 2. The work passage detecting means is a load cell for detecting a reduction load of the rolling rolls, and when the load cell stops detecting a predetermined reduction load, the work has passed between the rolling rolls. The rolling mill according to claim 1, wherein after making a determination, the rolling roll and the pinch member are reversely rotated.