JPH025488B2 - - Google Patents

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.

Warpage in strips of cold-rolled steel plates, stainless steel plates, aluminum plates, etc. rolled by rolling mills,
A tension leveler is used to correct partial elongation, distortion, etc. (generated by rolling).

Conventionally, the following tension levelers have been used. In FIG. 1, reference numeral 1 denotes a strip, that is, a material to be straightened, which is moved in the direction of the arrow under tension by a bright roll (not shown). Reference numeral 10 denotes a tension leveler which is arranged in a staggered manner vertically with respect to the material 1 to be straightened.

The tension leveler 10 is constructed as follows. 2 is a work roll, which corrects shape defects by repeatedly bending the material 1 to be corrected with a large processing curvature. The diameter of the work roll 2 gradually increases in the direction of movement of the material 1 to be straightened, and the processing curvature imparted to the material 1 to be straightened is gradually reduced to reduce residual stress in the material 1 to be straightened after straightening. There is. 3a, 3b are intermediate rolls, 4a, 4b, 4c
are back-up rolls, and these are used to reinforce the work roll 2 having a small diameter. 5
a and 5b are deflector rolls and each work roll 2
This prevents the adjustment from affecting other rolls and facilitates the adjustment and operation of the tension leveler 10. In addition, 6 is a roll bearing, 7 is a roll bearing support metal fitting, and 8 is a deflector roll bearing.

When the strip is straightened using the tension leveler as described above, the strip can be made into a good shape.

However, from time to time, very faint line-shaped clouding called a chatter mark occurs on the surface of the strip, and this chatter mark reduces the commercial value.

Therefore, the present invention provides a tension leveler in which such chatter marks do not occur. The structure of the present invention that achieves this object includes a work roll that presses the material to be straightened from one side of the material, an intermediate roll that receives a reaction force applied to the work roll, and a work roll that receives the reaction force applied to the intermediate roll. In the tension leveler, the tension leveler is composed of a back up roll that receives the material to be straightened, and a pair of deflector rolls that are provided on the other side of the material to be straightened and that receive the material to be straightened and are pressed by the work roll. It is characterized in that the center is arranged so as not to be located on the perpendicular bisector of the line segment connecting the axes of the pair of deflector rolls.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

Chat marks are caused by tension fluctuations in the strip, resulting in changes in the contact between each roll (between the work roll and the intermediate roll or between the intermediate roll and the back-up roll), the strip itself causing self-excited vibration, or each roll causing minute vibrations. Occurs by causing

FIG. 2 is an explanatory diagram showing the force applied to each roll in one tension leveler 10. In the figure,
If the force applied to the work roll 2 due to the tension of the strip 1 is F, then an equal force P is applied to each of the intermediate rolls 3a and 3b.

The force P applied to the intermediate roll is decomposed into Q and R, and an equal force Q is applied to each of the backup rolls 4a and 4c, and an equal force R is applied to the central backup roll 4b from above on both sides. The resultant force S ₀ due to the two R's lies on a straight line because the roll arrangement and the angle formed by the strip 1 are symmetrical with respect to the straight line passing through the center of the work roll 2 and the center of the backup roll 4b. However, due to a slight tension variation (tension imbalance) between the left and right strips 1, the direction of the force F varies, and therefore the direction of the resultant force _S0 also varies. Since the central back-up roll 4b has a bearing clearance 9, when the direction of the resultant force _S0 changes, the back-up roll 4b is displaced from side to side, and the contact of each roll changes minutely, causing roll vibration.

On the other hand, since the arrangement of the rolls as shown in FIG. 3 is symmetrical as described above, the center of the work roll 2 is located on the perpendicular bisector of the line connecting the centers of the deflector rolls 5a and 5b. The strip 1, the work roll 2, and the deflector roll 5 exist between the work roll 2 and the deflector roll 5a.
The length of strip 1 existing between b is equal,
The self-excited vibration of the strip 1 is assisted.

Since chatter marks occur on the strip due to the above two factors, in order to prevent this, the present invention has been developed so that even if the magnitude of the force applied from the left and right intermediate rolls to the center back-up roll changes somewhat, the center back-up roll remains on the left and right sides. In order to prevent vibrations, the structure is such that the magnitude of the force applied from the left and right intermediate rolls to the central backup roll is different in advance. Further, in order to prevent self-excited vibration of the strip, consideration is given to making the lengths of the left and right strips between the work roll and the left and right deflector rolls different.

Since the present invention is a partial improvement of the conventional tension leveler, the same parts are given the same reference numerals, and only the different parts will be explained.

As shown in FIG. 4, the components of the present invention are the same as those of the prior art. When the perpendicular bisector of the line segment connecting the center O ₁ of the deflector roll 5a and the center O ₂ of the deflector roll 5b is a straight line Y-Y, the center O ₃ of the work roll 2
is arranged so that it is not located on the straight line YY. That is, the deflector rolls 5a and 5b are arranged so that the straight line XX drawn parallel to the straight line Y-Y from the center _O3 and the straight line Y-Y are shifted by l. The deflector rolls 5a and 5b may be misaligned on the exit side (right side in Figure 4) or on the input side (left side in Figure 4), but in consideration of preventing the work roll 2 from popping out and the correction process, etc., it is set as shown in this embodiment. It is better to move it to the entrance side. In this case, work roll 2, intermediate roll 3
a, 3b, backup roll 4a, 4b, 4c
The positional relationship is symmetrical with respect to the straight line XX, as in the conventional case.

Next, the relationship between the forces acting on each roll will be explained based on FIG. 5. Due to the above-mentioned deviation amount l, the relationship between the wrapping angles α ₁ and α ₂ of the strip 1 on the input side and the output side is α ₁ <α ₂ , so the resultant force F due to the tension of the strip 1 is expressed by the straight line X-X It is applied to the work roll 2 from a direction inclined by β=α ₂ −α ₁ /2. (In the figure, β is greatly exaggerated for convenience of explanation.)
This force F is decomposed into P ₁ and P ₂ and applied to intermediate rolls 3b and 3a, respectively. Force applied to intermediate roll 3b
P ₁ is decomposed into Q ₁ and R ₁ and added to backup rolls 4c and 4b, respectively. On the other hand, the force P ₂ applied to the intermediate roll 3a is decomposed into Q ₂ and R ₂ and applied to the backup rolls 4a and 4b, respectively. In this way, forces of magnitude Q ₂ and Q ₁ act on the back-up rolls 4a and 4c on both sides, and the back-up rolls 4a and 4c are always
Since a large force is applied to push the strip in the direction of , the direction is stable even when the tension of the strip 1 changes. Since forces R ₂ and R ₁ of different magnitudes are applied to the central back-up roll 4b from above on the left and right sides, the resultant force R ₃ is also inclined with respect to the straight line XX. Therefore, even if there is some variation in the magnitudes of R ₁ and R ₂ , R ₂ >R ₁ will always hold, and the backup roll 4b will not vibrate from side to side.

Further, as can be seen from FIG. 4, since the lengths of the strip 1 existing between the work roll 2 and the deflector rolls 5a and 5b are different from each other, the self-excited vibration of the strip 1 is restrained, and as a result, the intermediate roll 3a , 3b and work roll 2 is also stabilized,
There is no dancing or vibration.

Because of this, a beautiful strip 1 can be obtained without the occurrence of chatter marks.

As described above with reference to the drawings, one embodiment of the present invention is arranged so that the axis of the work roll is not located on the perpendicular bisector of the line connecting the axes of the pair of deflector rolls. Vibration and self-excited vibration of the strip are prevented, and a beautiful strip without chatter marks can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 relate to a conventional tension leveler, where Figure 1 is a layout diagram, Figure 2 is an explanatory diagram of the force acting between each roll, and Figure 3 is an explanatory diagram of the positional relationship of each roll, FIGS. 4 and 5 relate to the present invention; FIG. 4 is a layout diagram of each roll, and FIG. 5 is an explanatory diagram of the force acting between each roll. In the drawing, 1 is a strip, 2 is a work roll,
3a, 3b are intermediate rolls, 4a, 4b, 4c are back-up rolls, 5a, 5b are deflector rolls, 6 is a roll bearing, 7 is a roll bearing support fitting,
8 is a deflector roll bearing, 9 is a play, and 10 is a tension leveler.

Claims (1)

[Claims] 1. A work roll that presses the material to be straightened from one side of the material to be straightened, an intermediate roll that receives the reaction force applied to the work roll, a back-up roll that receives the force applied to the intermediate roll, and a A tension leveler comprising a pair of deflector rolls provided on the other side and receiving the material to be straightened pressed by the work roll, wherein the axis of the work roll is aligned with the axis of the pair of deflector rolls. A tension leveler characterized in that it is arranged so as not to be located on the perpendicular bisector of the line segment connecting.