JPS60121020A - Tension leveler - Google Patents

Abstract

PURPOSE:To prevent the generation of a chatter mark by making deflector rolls freely movable in the line direction and adjusting freely the center distance between a work roll and the deflector roll at the outlet side. CONSTITUTION:A tension leveler presses work rolls against a strip 1 which is a material to be straightened and is stretched between deflector rolls 15a, 15b located at the outlet and inlet sides, to straighten the strip 1 by bending it. The deflector drolls 15a, 15b are arranged independently and freely movably in the line direction, and the work rolls 12a, 12b are arranged in series in the line direction. Therefore, both spans S2 and S3 at the outlet side of work roll can be shortened, and the generation of a chatter mark is prevented even when the strip 1 is moved at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tension leveler for correcting deformation of a material to be straightened, such as a strip.

cold-rolled steel sheets, stainless steel sheets, rolled by rolling mills;
Conventionally, the first
A tension leveler lO as shown in the figure is used. As shown in the figure, each tension leveler lO is arranged in a staggered manner vertically with respect to the material to be straightened 1, and these have the following configuration. That is, 1. The material to be straightened is moved in the horizontal direction by applying tension to the priddle roll (not shown), and the entry and exit deflector rolls 5 are placed above or below the material to be straightened. a l
Llb is rotatably supported by a bearing 8. On the opposite side of the deflector rolls 5a and 5b, a small-diameter work roll 2 that repeatedly bends the material 1 with a large processing curvature is pressed against the material 1 stretched between the inlet and outlet deflector rolls 5a and 5b. .

The work roll 2, the intermediate rolls 3a, 3'l) supporting the reaction force acting on the work roll 2, and the lift-up rolls 4a, 4b, 4c are rotatably supported by a roll bearing 6. It is supported by a support fitting 7.

If a tension leveler with such a configuration is used to straighten a strip, it can be made into a strip with a good shape, but at times very faint line-shaped cloudy marks called chatter marks may appear on the strip surface. There was an inconvenience that the product value decreased due to this Chatta mark.

The cause of the chatter marks is that when the material to be straightened 1 undergoes plastic processing by bending from the work roll 2, the work roll 2 and the outlet deflector roll 5 are bent at a certain line speed or higher.
It is thought that this is because tension vibration of the material 1 to be straightened during the period b is induced, and this remains in the form of marks such as wrinkles called chatta marks on the New Year 1 to be melted. Tsumashi.

It can be seen that the center-to-center distance between the work roll 2 and the outlet deflector roll 5b has a great influence on the occurrence of chatter marks.

Based on the above findings, the present invention provides a tension leveler that freely adjusts the center-to-center distance between the work roll and the exit side deflector roll and prevents the occurrence of chatter marks by making the deflector roll movable in the line direction. The purpose is to provide. The present invention, which achieves the above object, is a tension level system that straightens a temporary straightening material by pressing a work roll against the material stretched between the entrance and exit deflector rolls. The inlet deflector roll and the outlet deflector roll are arranged to be movable independently in the line direction, while the work roll is comprised of two work rolls arranged in front and behind each other.

An embodiment of the tension leveler of the present invention will be described below in detail with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 2 and 3.

As shown in the figure, an entrance deflector roll 15a and an exit deflector roll 15b are each independently supported by bearings 18a and 18b so as to be movable in the zigzag direction above the horizontally moving material 1. . On the lower side of the material to be straightened 1, the work rolls 12a and 12b on the entry and exit sides are pushed against the material to be straightened 1 which is stretched between the deflector rolls 15a and 15b on the entry and exit sides.

These inlet and outlet work rolls 12a and 12b are supported by roll bearings 16 side by side. Intermediate rolls 13a, 13b that support reaction forces acting on the entry and exit work rolls 12a, 12b.

13, e and backup port, k14a, 14b.

14c and J4d are supported by a roll bearing 16, and this roll bearing 16 is also movable in the line direction. Any suitable known device can be used to make the bearings 18a, 18b and the roll bearing 16 movable; for example, a wedge force or screw type (none of which is shown) may be used.

In the tension leveler of the present invention having the above configuration, the center-to-center distance S3 between the output work roll 12b and the output deflector roll 18b can be adjusted freely, so chatter marks on the material to be straightened can be prevented from occurring. can. That is, as described above, the center-to-center distance S3 greatly influences the occurrence of chatter marks. If this center-to-center distance S8 is shortened to increase the rigidity of the material 1 to be straightened in the direction perpendicular to the pass line during this period, the natural frequency of tension vibration of the material 1 to be straightened will increase as shown in FIG. 4(a). The top is 9. The material to be straightened becomes less likely to vibrate. Therefore, if this natural frequency is set above a certain value, the material to be straightened will not vibrate and chatter marks will not be generated on the material to be straightened. Also.

As shown in Fig. 4(b), which shows the relationship between the center-to-center distance S3 and the limit line speed for chatter generation, the limit line speed increases when the center-to-center distance s3 is shortened, so the material to be straightened can be processed at a higher line speed. Chatter marks do not appear even when driving.

Incidentally, in order to shorten the distance between the work roll and the outlet deflector roll, there is a method different from that of the present invention.

Reduce the diameter of the entrance and exit deflector rolls.

It is conceivable to shorten these center-to-center distances.

However, when the diameter of the deflector roll is made small in this way, the roll does not bend easily, does not serve to cut the line between adjacent levelers, requires a backup roll for reinforcement, and the bearing becomes larger. A new problem arises. Therefore.

In the present invention, in order to avoid such problems, the diameters of the inlet and outlet deflector rolls are set to the conventional diameters υ.

The deflector rolls 15a, 15br (which are independently movable in the lie/direction, and two work rolls 12a)
, 12b are placed side by side in the front and rear so that it can be used as a movable type with a center-to-center distance of S2 and the delta roll 15a+t5b.

In addition, the distance between the centers of the work rolls 12a and 12b is S2,
There is no fear that shatter marks will occur due to vibration between the conventional work roll and the exit deflector roll diameter-rolls 12a, 12b. or.

Since there are two work rolls, there is an advantage that the bending ability is improved compared to the conventional method. The reason why the entrance deflector roll 15a is made movable is that the center-to-center distance S□ from the entry-side deflector roll 15a to the entry work roll 12a is set to the center-to-center distance S2. This is because there are mandatory items that will be changed depending on S3.

As described above in detail based on the embodiments, the tension leveler of the present invention has a work roll exit side spa, that is, S,
, S can be made shorter, so even if the material to be straightened is moved at a higher speed than a conventional leveler, chatter marks do not occur, and product quality can be improved.

[Brief explanation of the drawing]

Figure 11 is a side view of a conventional tension leveler. 2 to 4 relate to one embodiment of the present invention, FIG. 2 is a side view of the tension leveler, and FIG. 3 is the arrangement of the rolls of the tension leveler. S
Graph showing the relationship between 3 and the natural frequency, Figure 4 (b)
is a graph showing the relationship between center-to-center distance S3 and chatter generation limit line speed. In the drawing. l is the material to be straightened. 12a and 12b are work rolls. 13a, 13b, 13c are intermediate I calls. 14a, 14b, 14c, 14dld are back-and-rolls, 15a, 15b are deflector rolls. 16 is a roll bearing. 18at IBb is a bearing. Sl, S2. S3 is the distance between centers. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Patent Attorney Sub-Representative Patent Attorney: Shibu Mitsuishi (and 1 other person) Fig. 2 () 1 needle to 1 needle S3 Fig. 3 4 Fig. 16 Distance between S3

Claims (1)

[Claims] In a tension leveler that bends and straightens the material to be straightened by pressing a work roll onto the material stretched between the entry and exit deflector rolls, the entry and exit deflector rolls are A tension leveler comprising two work rolls which are arranged to move independently in the line direction, and where the work rolls are installed front and rear.