JPS6376717A - Camber corrector for tension leveler - Google Patents

Abstract

PURPOSE:To efficiently obtain products having accurate flatness by providing a camber corrector with a device having bend and press rolls for a metallic strip in an upper and a lower position and oppressing the metallic strip with the upper and lower rolls. CONSTITUTION:Deflector rolls 5 movable in the vertical direction are installed in the front and back of a camber corrector and the rolls 5 are moved up by a lifter 7 to run a metallic strip 1 along a bend roll 2. An oppressing force is given by pushing up a press roll 3 by a pressing device 6. In the case that the roll 2 is small, the roll 2 is supported with reinforcing rolls 4 and those rolls are fixed to an upper fixing bed 10.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tension leveler warp correcting device for correcting warpage in the longitudinal direction and width direction of a metal strip and flattening the metal strip.

<Prior art> -i, the tension leveler is the material to be straightened, and
+ ,, -' +Voice-Iff-h l+Bending gives rare bamboo Δ stress and is a device that corrects flatness defects caused by rolling by stretching the metal strip by about 0.2 to 1.5%. . However, the metal strip whose flatness has been corrected by such tension and bending warps in the longitudinal and width directions due to slight elongation between the upper and lower surfaces and differences in widthwise shrinkage.

Therefore, in the conventional tension leveler, as shown in FIG. A warp correction device suitable for thin high-strength steel sheets has been proposed, which corrects only the warp in the longitudinal direction after correcting the warp in the width direction while preventing the rolls 2 from interfering with each other. Furthermore, as shown in Japanese Patent Publication No. 61-14895, by appropriately selecting the roll diameter for correcting warp in the width direction and the roll diameter for correcting warp in the longitudinal direction with respect to the total plastic bending moment of the metal strip, A simple warpage correction device has also been proposed in which one correction roll is used for warpage and one widthwise warpage, and the deflation roll is also omitted.

In addition, in FIG. 7, 1 is a metal strip, 4 is a reinforcing roll, 7 is a vertical movement device for a warping correction device, 8 is a bending roll support frame, 9 is a roll support frame, 10 is a fixed wall of the upper i, 12 is the stand for the roll.

<Problems to be Solved by the Invention> However, the warpage in the width direction and the warp in the longitudinal direction of the metal strip are not independent; in order to correct the warp in the longitudinal direction, the metal strip is bent in the opposite direction to the warp, and When the inner circumferential side of the fabric is stretched in the longitudinal direction, only the stretched portion will shrink in the width direction, so correcting the warpage in the longitudinal direction will always cause warpage in the width direction. In this way, with conventional means, each roll has a single function, that is, only the function of bending in the longitudinal direction, so there is a problem in that it is not possible to correct warpage in the width direction and warpage in the longitudinal direction at the same time. .

As a result of researching the causes of warpage in the metal strip in the Tensimin Repeller, the inventor found that most of the areas in the cross section of the metal strip that yield under tension and bending are Shrinkage distortion occurs in the plate thickness and width direction due to the elongation, and uneven shrinkage in the width direction within the cross section causes widthwise warping, and similarly uneven longitudinal bowing causes longitudinal warpage. It has become clear that this will occur. Of these, warpage in the longitudinal direction can be easily corrected by bending the metal strip in the opposite direction to the direction of warpage, allowing the side with insufficient elongation to yield and stretch, but the shrinkage in the width direction at this time is Due to the influence of residual stress in the direction, the bending is not the same as in the previous bending, and warpage in the width direction remains. The most effective way to solve this problem is to provide a new means that does not cause shrinkage in the width direction even when elongation is applied in the longitudinal direction.

Means for Solving the Problems> The configuration of the present invention for solving the above problems is such that in the warp correction device for a tension leveler, there are fewer warp correction devices (one of which is installed relatively later). It is characterized in that it has upper and lower rolls for bending and pressing the metal strip, and is equipped with a device for tightening the metal strip with the upper and lower rolls.

To specifically explain the effect, the increment of stress and strain in the rolling direction is expressed as σ and Δε, and the increment of stress and strain in the width direction and thickness direction is expressed as σ2. Δε7. σ2. Δε
Set it to 2. From the formula of plastic mechanics, there is the following relationship between the amount of increment of strain and stress.

Δε=a(2σ.-σ,-σZ)...(1)
Δε=a(2σ−σ−σ) ...(2) Δε=
a (2σ2-σ2-σy) ...(3)
Here, a is a positive proportionality constant.

Since the plastic strain when bending is minute, the relationship between the longitudinal stress σ8 and the width direction stress σ is similar to that of elastic mechanics and is given by the following equation.

σ、nijiσu
...(4) Here, ν is called Poisson's ratio and is 0.3 to 0.33 for metals.

In order to prevent shrinkage in the width direction, in equation (2), it is sufficient if 2σ - σ - σ = 0 ・(5) < , (Substituting equation 41 into equation (5), the following equation is obtained. obtain.

σ2=(2c1)σ8 ・(6)
In other words, consider that Poisson's ratio is 0.3 to 0.33! Then, σ is 10,4σ8 to -0,34cr.

It is necessary that

When a thin metal strip is bent under tension along a roll, the stress σ2 in the thickness direction is almost 0, and it is clear that the above conditions are not satisfied.

Jumokumei I+ Maekana Hashiki Kyu 17 Stand/l l) A? The warp correcting device has a bending roll and a press roll as a means for applying compression rolls in the thickness direction of the sheet, and is also equipped with a device for tightening the metal strip with the upper and lower rolls.

Since the longitudinal stress σ of the yielding part in the plate thickness section is almost the yield stress of the metal strip, the tightening force is such that the plate thickness direction stress is -0.4 to -0.34@ of the yield stress. By simply keeping it constant, shrinkage in the width direction can be prevented and warping in the width direction will hardly occur.

In addition, when tightening a metal strip, the force is −0 of the yield stress,
Since it is about 4 to -0.34 times, there will be no problem that the metal strip or lip will be rolled and the plate U will be significantly reduced.

To explain further, since the longitudinal stress f8 of the yielding part in the plate cross section is almost the yield stress σ of the metal strip, σ8zσy, and as can be seen from equation (6), the tightening force is in the plate thickness direction. Stress is -0,4 to -0 of yield stress
, 34 times. However, if the yield stress varies in the longitudinal direction of the metal strip, warping will occur even if the optimum tightening force for warping correction is initially set to a force.

At this time, the relationship between warpage in the sheet width direction and yield stress is as follows.

Now, assume that the tightening force is set to the optimum value for the yield stress σ of the metal strip.

When B, σ=(2c1)σy, ...(7
) holds true. When the yield stress of the metal strip decreases from σ7° to σ−Δσ, σ=σ−Δσ ... (8) σ,
=ν(σ,.−Δσ2.) ・(
9), so it can be seen from equation (2) that Δε, = a(2ν(σ,.−Δσyp)−(σ21:,
−Δσy, )−(2cy1)σ7. ) = a (1-2ν)Δσ22〉0...(1
u), the lower surface side of the yielded plate cross section also extends in the width direction, and the metal strip warps downward in a convex manner as shown in FIG. 8(a).

For exactly the same reason, when the yield stress of the metal sl-IJ tube increases from σ to σ0Δσ, Δε=a(2c1)Δσ<0...(ll),
The lower surface side of the yielded metal strip shrinks in the width direction and curves upward in a convex manner as shown in FIG. 8 (bl).

In other words, when the presser roll is at the bottom, the tightening force decreases when the metal strip curves downward convexly in the width direction, and the tightening force increases when the metal strip curves upwardly. Must be.

The opposite is true if the presser foot roll is on top.

Embodiments Hereinafter, embodiments according to the present invention will be described based on FIGS. 1 to 6.

FIG. 1 shows a first embodiment, in which deflector rolls 5 movable in the vertical direction are installed before and after the warp correction device,
The deflector roll 5 is moved upward by a transfer device 7 to cause the metal strip 1 to lie along the bending roll 2. Tightening can be achieved by pressing down on the force and pushing up the roll 3 with the M6. In addition, if the bending roll 2 has a small diameter,
Bending roll 2? I! It is supported by one strong roll 4, and these are fixed to the fixed wall 10 on the upper surface.

FIG. 2 shows a second embodiment, in which a group of rolls for correcting warpage is housed in a housing 11, and a pressing device 6 is provided between a recess in the housing and a roll support frame 8. Then, the housing 11 is further moved upward by the moving device 7, so that the metal strip 1 can be aligned with the bending rolls 2.

FIG. 3 shows a third embodiment, in which a plurality of warp correction devices are arranged.

FIG. 4 shows a fourth embodiment, in which the pressing force of the pushing roll 3 may be controlled by hydraulic pressure using a hydraulic cylinder, or the amount of pushing up may be controlled using a screw. Further, in this embodiment, the bending roll 2 is supported by two reinforcing rolls 4, and these are fixed to the fixed wall 10 on the upper surface. The reinforcing roll 4 may be omitted, or if the bending roll 2 has a smaller diameter, it may be supported by two or more reinforcing loaves 1. Two deflation crawlers 51 are provided on the exit side of the warpage correction device,
During this time, the width direction Ji of the tongue 1 is measured by the detector 13, and the calculator 14 calculates whether the force to be applied by the presser roll 3 increases or decreases, and Activate device 6.

FIG. 5 shows a fifth embodiment, in which a detector 13 for warpage in the width direction of the metal strip 1 is connected to a prydle roll 15 for applying tension to the metal strip 1 and a metal strip 1
It is installed between the winding devices 16.

Figure 6 shows the sixth embodiment, in which the warpage correction device is
The device 6 is actuated by the pressing of the plurality of cull III normal devices based on the signal detected by the widthwise deflection detector 13 at the outlet.

Note that the width direction warp detector includes a reflected light deviation angle measuring device, a width direction deviation distance @@@@, and others. Reflected light deviation angle measuring device: For example, it is a device that irradiates a laser beam from a fixed light source in the width direction of a metal strip, and detects the warpage of the running metal strip as the deviation angle of the reflected light using an array of light receivers. For example, the deflection distance measuring device measures the distance between the tip of the detector and the surface of the metal IJ tube by changing the impedance of an oscillation coil in a high frequency oscillation circuit, but other methods may be used.

Further, the gist of the present invention is that when bending the metal strip along the rolls, the metal strip is held down by the left roll to generate compressive stress in the thickness direction and eliminate shrinkage in the width direction of the metal strip. The purpose of this invention is to prevent warping in the width direction of the metal strip and obtain a flat He, and the present invention is limited by the structure of the device for tightening the metal strip, the arrangement of the warp correction device, the number of rolls, etc. isn't it.

<Effects of the Invention> As described above, according to the present invention, when correcting warpage using a tension leveler, it is necessary to correct only the warpage in the width direction (usually kept at almost zero, so only the warp in the longitudinal direction is corrected). ,
Products with high efficiency and high flatness can be easily obtained.

4 Brief Description of the Drawings Figures 1 to 6 show embodiments of the present invention. Figure 1 is a side view of the first embodiment, Figure 2 is a side view of the second embodiment, and Figure 2 is a side view of the second embodiment. 3 is a side view of the third embodiment, FIG. 4 is a side view of the fourth embodiment, FIG. 5 is a side view of the fifth embodiment, and FIG. 6 is a side view of the fourth embodiment.
A side view of the embodiment, FIG. 7 is a side view of the conventional example, and FIG.
) is a perspective view of a conventional metal strip, and FIG. 8(b) is a perspective view of the same conventional metal strip.

In addition, the symbols in the figure are: 1 is a metal nut trip, 2 is a bending roll, 3 is a presser roll, 4 is a reinforcing roll, 5 is a deflation crawl, 6 is a pressing device, 7 is a vertical moving device,
11 is the housing, 13I +)S Iτ T, '4
K: ++ ++ +u 几PO i
A ++J ft ttn 1
c+-hw ride roll, 16 is a winding device.

Patent applicant Mitsubishi Heavy Industries, Ltd Revenge generation person Patent Attorney Hikari Ishi Department (1 other person)

Claims (1)

[Claims] In the warp correction device for a tension leveler, at least one of the warp correction devices installed at a relatively later stage has upper and lower rolls for bending and pressing the metal strip, and is equipped with a device for tightening the metal strip with the upper and lower rolls. This is a tension leveler warpage correction device that is characterized by: