JPH05253605A - Rolling mill - Google Patents

Abstract

PURPOSE:To provide a rolling mill with which draft can be economically and easily increased without accompanying the modification of roll stand. CONSTITUTION:A pair of work rolls 1 and a pair of back-up rolls 2 with which these work rolls 1 are supported are provided, the ratio of the length to the diameter of the work roll is larger than 6 to 1 and the ratio of the diameter of the work roll to the diameter of the back-up roll is larger than 1 to 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage rolling mill.

[0002]

2. Description of the Related Art Some rolling mills have a pair of work rolls and a pair of support rolls for supporting the work rolls.

For example, since the clad material is manufactured by pressing different kinds of metals by cold rolling, a rolling mill used for the crimping is required to have a large reduction rate in order to perform sufficient crimping. It

In the conventional rolling mill used for such cold rolling, a roll stand of the rolling mill has a large size in order to cope with rolling that requires a large reduction ratio such as when cold rolling a clad material. In other words, the rolling mill itself is upsized to increase its mechanical strength to enable rolling with a large reduction rate. Here, the difference between the plate thickness at the roll inlet and the plate thickness at the roll outlet of the material to be rolled is called the reduction amount, and the ratio of this reduction ratio to the inlet thickness is called the reduction amount.

[0005]

However, a method of enlarging the roll stand to increase its mechanical strength and enable rolling with a large large reduction ratio is as follows. Since it needs to be remodeled on a large scale, there is a problem that it requires high cost and a lot of trouble.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a multi-stage rolling mill capable of easily and economically increasing the rolling reduction ratio without modifying the roll stand.

[0007]

Means and Actions for Solving the Problems The present inventor has conducted various studies on the improvement of the rolling reduction in a rolling mill. As a result, the following was found.

The diameter of the work roll and the size of the housing are factors that determine the size of the rolling reduction in the rolling mill. That is, if the diameter of the work roll is simply increased, the rolling load is increased, and the minimum plate thickness that can be rolled is also increased. Therefore, it is difficult to increase the reduction rate. Further, it is not possible to carry out rolling exceeding the maximum rolling load determined by the housing rolling size.

Therefore, based on the above circumstances, the inventors of the present invention provide a rolling mill capable of improving the apparent reduction without changing the housing size and thereby improving the rolling reduction. As a result of various studies on the dimensions and the ratio of the diameter of the work roll to the support roll, the present invention has been achieved.

That is, the rolling mill of the present invention comprises a pair of work rolls and a pair of support rolls for supporting the work rolls, and the work roll has a length-diameter ratio of 6: 1 or more. The ratio of the diameter of the work roll to the diameter of the support roll is 1: 4 or more.

If the ratio between the length and the diameter of the work roll is too small, the roll gap (between the rolls) cannot be set so much that the rollable range is reduced. The ratio of roll length to diameter was 6: 1 or more.

If the ratio between the diameter of the work roll and the diameter of the support roll is too small, the roll gap cannot be set so much that the rollable range is reduced and the roll is rolled.
It becomes difficult to remove the roll when changing the roll. Further, since the rolling load does not decrease and the desired rolling becomes difficult, the ratio of the diameter of the work roll to the diameter of the supporting roll is set to 1: 4 or more.

Therefore, when the ratio of the length of the work roll to the diameter is 6: 1 or more, and the ratio of the diameter of the work roll to the diameter of the support roll is 1: 4 or more, the ratio of the respective constituent elements is Indicates that becomes larger.

However, when the ratio of the length to the diameter of the work roll becomes large, the work roll is easily bent, and the dimensional accuracy of the processed material deteriorates. Further, the work roll is broken. Therefore, by adopting a configuration in which the shaft surface of the work roll can be displaced from the shaft surface of the support roll to the working material moving direction entry side or exit side, the force applied to the work roll is made uniform and deflection is prevented. be able to.

Also, the ratio of the diameter of the work roll to the diameter of the support roll becomes large. That is, when the diameter of the roll is reduced, if the roll is driven by the roll, the rolling torque of the rolling mill is limited due to the strength of the roll neck. The rolling limit occurs and the rolling reduction cannot be increased. For this reason, if the roll is driven by the support roll, it is possible to transmit a high rolling torque and it is not possible to obtain a target rolling reduction. Since the drive roll can be used as a support roll as it is, it is not necessary to modify the drive system of the rolling mill.

As described above, the means for improving the rolling reduction of the rolling mill of the present invention is only to specify the dimensions of the work roll and the supporting roll, and to determine the rolling stand of the rolling mill. No large-scale modification is required to increase the strength, and the economic burden and labor for increasing the rolling reduction are extremely small.

In the rolling mill of the present invention, the structure of the rolling mill is not specified as long as it has a pair of work rolls and a pair of support rolls supporting the work rolls.

[0018]

EXAMPLE A clad material was cold-rolled using a rolling machine having a schematic structure shown in FIG.

In FIG. 1, 1 is a pair of work rolls,
2 is a pair of support rolls, 3 is an outer support roll, 4 is a roll
It is Le Stand. A clad material 7 as a processed material is manufactured to have a thickness of 3.7 mm and a width of 250 mm by stacking a pair of copper plates 6 on both sides of a stainless steel plate 5 and passing them between a pair of work rolls 1 and press rolling. To do. The following
All rustands have the same dimensions. Example of the present invention

A pair of work rolls 1 having a diameter of 105 mm and a length of 760 mm were used, and a pair of support rolls 2 having a diameter of 420 mm and a length of 650 mm were used. The ratio of the work roll 1 length 760 mm to the work roll 1 diameter 105 mm is about 7: 1, and the work roll 1 diameter 1
The ratio of 05 mm to the diameter of the support roll 2 of 420 mm was 1: 4. This is within the range of the conditions specified by the present invention. When rolling the clad material, rolling load 4
With 70 tons, the required large reduction rate of 60% could be obtained. Further, the deflection can be prevented by slightly shifting the axial surface of the work roll 1 with respect to the axial surface of the support roll 2 in the advancing direction of the clad material. Comparative example

A pair of work rolls 1 having a diameter of 450 mm and a length of 650 mm were used, and a pair of supporting rolls 2 having a diameter of 800 mm and a length of 600 mm were used. The ratio of the work roll 1 length 650 mm to the work roll 1 diameter 450 mm is about 4: 1, and the work roll 1 diameter 4
The ratio of 50 mm to the diameter 800 mm of the support roll 2 is about 1:
It was 1.7. This means that the ratio of the length of the work roll 1 to the diameter of the work roll 1 deviates from the range of the conditions specified by the present invention. When rolling the clad material, the rolling load was 800 tons and the rolling reduction was 40%, which was small.

[0022]

As described above, according to the present invention, there can be obtained a rolling mill capable of economically and easily increasing the rolling reduction without remodeling the roll stand and ensuring the required rolling reduction. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of a rolling mill of the present invention.

[Explanation of symbols]

 1 ... work roll, 2 ... support roll.

Claims (3)

[Claims] 1. A pair of work rolls, and a pair of support rolls for supporting the work rolls, wherein the ratio of the length to the diameter of the work rolls is 6: 1 or more, and the diameter of the work rolls and the support. A rolling mill characterized in that the ratio to the diameter of the roll is 1: 4 or more. 2. The rolling mill according to claim 1, which is of a supporting roll drive type. 3. The rolling machine according to claim 1, wherein the work roll shaft surface is displaceable from the support roll shaft surface to the inlet side or the outlet side in the direction of movement of the workpiece.