JPS6149708A - Wrapping different-speeds rolling mill - Google Patents

Abstract

PURPOSE:To obtain a titled mill capable of rolling a material into a rolled product having an excellent shape by using a small motor, by making a large-diameter roll placed at the high speed side and made to wrap a rolling material around it drivable, and making a small-diameter roll, placed at the low speed side and made not to wrap the material, idle, in case of rolling a rolling material by a pair of upper and lower different-speed work rolls. CONSTITUTION:In case of rolling a rolling material S by a pair of upper and lower different-speed rolling rolls 1, 2; the material S is rolled by keeping the small roll 1, made not to wrap the material S and to be idle, at low speed, and driving the large roll 2, made to wrap the material S around it and to be driven by a motor 3, at high speed. The frictional forces of the opposite directions are produced at the upper and lower surfaces of material S to reduce a load, because of the difference between the peripheral speeds of both rolls 1, 2, but the effect of different speeds is reduced because the roll 1 is not driven. But, by making the diameter of roll 1 small, said reduction portion is compensated by the reduction of an equivalent roll diameter. Further, an excellent sheet shape and a high tension-difference are obtained by wrapping the material S around the roll 2 of outlet side, and the rolling can be performed by a small motor capacity.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to a winding method in which a rolled material is rolled only on the high-speed work roll of a pair of upper and lower work rolls having different circumferential speeds. relates to a different speed rolling mill.

[Prior Art] A different speed rolling method is known in which the circumferential speed of two work rolls is stopped and frictional forces are generated in opposite directions on the upper and lower surfaces of the rolled material to reduce the rolling load. There is. Among this different speed rolling, in the different speed rolling method, the rolled material is wound around the high speed side work rolls, as shown in Fig. 2, the high speed side neutral point N1 is aligned with the exit of the gap between the upper and lower work rolls a and b. Since the rolling load reduction effect can be stably obtained, the exit side plate speed in the width direction matches the peripheral speed of the upper work roll a, which is the high speed side, and the plate shape is good. have.

Therefore, the relationship between the net power and the rolling reduction ratio when the load is limited in the above-mentioned winding is as shown in the graph of Figure 3.
When a motor is attached to each roll, the power on the high speed side becomes positive as shown in curve A, the power on the low speed side becomes negative as shown at the beginning of the curve, and the power consumption is shown on the straight line that combines curve A and the end. It becomes like this. Therefore, in such a rolling method, a motor having a large power is required in terms of equipment. If only the high-speed side is driven and the low-speed side is idle, the equipment power may be sufficient, but in this case, the rolling load will increase by the amount of reduction in the speed-up effect.

Problems to be Solved by the Invention The present invention has been made in order to solve the above-mentioned problems by lowering the rolling load by making the work roll on the low speed side a small diameter idle.

Means for Solving Problems] In the present invention, the high-speed work roll on which the rolled material is wound is made driveable, and the low-speed work roll on which the rolled material is not wound is made into a small-diameter idle.

[Operations] Therefore, in the present invention, the rolled material is wound around a drivable high-speed work roll, and rolling is performed by the high-speed work roll and the low-speed work roll.

Example of excuse Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the winding and different speed rolling mill of the present invention.
In the figure, 1 is the inlet (low speed) side work roll of the small diameter idler, 2 is the out (high speed) side work roll that can be driven by the motor 3, 4 is the back roll of the work roll 1, and the rolled material S is the work roll. The sheet is passed between the rolls 1 and 2 and wound around the work roll 2.

In a different speed rolling mill, such winding occurs because there is a difference in the circumferential speed of the work rolls 1°2, so a frictional force is generated in the opposite direction on the upper and lower surfaces of the rolled material S, reducing the rolling load. is not driven, so the different speed effect is reduced. However, the reduction in the different speed effect is compensated for by the reduction in the equivalent roll diameter due to the smaller diameter of the working roller 1. Further, by winding the rolled material S around the work roll 2 on the exit side, a good plate shape and a high tension difference can be obtained, and the neutral point can be stabilized.

The good plate shape is due to the constant volume velocity.

It is for reason. That is, the inlet side plate thickness at one width end of the rolled material S is H+, the outlet side plate thickness is h+, the inlet reference length is L+, the outlet reference length is 11, and the other width end Then, corresponding to the above, respectively - H2, hz, Lz, Iz
Then, L+ H+ -! +h+・Lz Hz
-Iz hz holds true. The exit plate speed is equal to the second circumferential speed of the work roll on the high-speed side, so ! +-12=V+-t (t: between Ii)
Since the length of the plate after rolling is constant in the width direction of the plate, the shape of the plate is good.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the rolling mill of the present invention, the winding has various effects due to different speed rolling, namely, the shape of the plate is improved, a high tension difference can be obtained, and the neutral point is stabilized. In addition, since the motor capacity is small, equipment costs and operation and maintenance costs can be reduced, and other benefits can be achieved.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of a different speed rolling mill with the winding of the present invention, Fig. 2 is an explanatory diagram of a different speed rolling mill with conventional winding, and Fig. 3 is an explanatory diagram of an embodiment of a different speed rolling mill with the winding of the present invention. It is a graph showing the relationship between the net power and the rolling reduction rate when the load of a different speed rolling mill is limited. In the figure, 1.2 indicates a work roll, 3 indicates a motor, and 4 indicates a backup roll. Patent application Hitoshi Kawajima Ban M Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) A winding and different speed rolling mill in which rolling material is wrapped only around the work rolls on the high speed side for different speed rolling, characterized in that the work rolls on the low speed side are made into small diameter idles.