JPH0760352A - Method and device for straightening camber of plate - Google Patents

Abstract

PURPOSE:To accurately straighten an initial camber through a single correcting action by deciding a bending quantity based on the initial shape measured and imparting to a plate a four point bend or five or more points of bend. CONSTITUTION:A plate 10 whose camber is to be straightened is transported by a pinch roller 4. Both ends of the plate 10 are clamped by clamping devices 1a, 1b, 1c, 1d at both sides of the plate. Then, in accordance with the initial conditions such as the measured quantity of camber, dimension of the plate and property of the plate, and in control of the pressurizing force or thrusting quantity to be applied to two points or more and a position in the line direction, the plate 10 is imparted with four point bend or five or more points of bend. As a result, the initial camber is accurately and uniformly straightened with a single action. Moreover, there is an effect of preventing the local lowering in the strength of the plate 10 since deformation is evenly spread on the entirety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate camber straightening method and apparatus.

[0002]

2. Description of the Related Art Generally, the following method is used for correcting the camber of a plate. (A) 3-point repeated bending method As shown in FIG.
It is sandwiched by 12 and fed sequentially in the longitudinal direction, two reduction devices 13 and 14 are arranged on the concave side of the camber, and one reduction device 15 is arranged on the convex side of the camber to sequentially correct the camber. . That is, the plate thickness t, the plate width W, the Young's modulus E of the material,
The rolling load P determined by the yield stress σ is set, and the plate 10
While sequentially transporting, the three-point bending in which two relatively close points on the concave side of the camber are supported and one point on the convex side of the camber at the center is pressed down is repeated many times in the longitudinal direction of the plate, and after that, the camber amount is measured. Repeat the three-point bending correction for the entire length of the plate until the measured value falls within the set allowable value. (B) A straightening method using a leveler with a flange.

As shown in the side view of FIG. 7 (a) and the plan view of FIG. 7 (b), the flanges 22 are alternately mounted and the straightening is performed by the flange of the leveler roller 21 having the thrust bearing 23 mounted thereon. , Is used when the plate 10 is a narrow material.

[0004]

The conventional three-point repeated bending method has the following problems. (1) Although the camber can be locally corrected, the camber of the entire length of the plate cannot be corrected by one time. Therefore, work efficiency is poor. (2) A three-point bending cannot obtain a uniform bending moment distribution that is optimum for straightening. It also causes a plate break. (3) Since it is necessary to repeat the correction many times, it takes a long time to correct one plate. (4) The rolling load is often determined by the experience of the operator, but the setting error of the rolling load P greatly affects the plate shape after correction.

Further, the bending straightening method using the leveler with the flange has the following problems. (1) The bending accuracy is poor and cannot be corrected accurately. (2) For wide materials, the deformation does not reach the center of the plate, so it cannot be corrected.

[0006]

The present invention has been proposed in order to solve the above-mentioned problems, and in correcting a plate camber, it supports both ends in the longitudinal direction of the plate on the camber concave side and the camber convex side. In the plate camber straightening method, the pressing force or the pressing amount applied to two or more points is determined according to the camber amount, the size of the plate and the physical properties of the plate, and the pressing force or the pressing amount is applied at one time. is there.

The apparatus of the present invention which can suitably carry out this method is characterized by comprising a clamp for clamping both ends of the plate and a reduction device for pressing two or more points on the convex side of the camber. It is a plate camber straightening device. This device can be adapted to the plate length by making the clamp position and the position of the reduction device variable according to the plate length.
Further, it is possible to determine the position and size to which an appropriate pressing force or displacement is applied according to the specifications of the plate and the amount of camber, and to apply this.

[0008]

According to the present invention, the bending amount is determined based on the measured initial plate shape, and the plate is bent at four points or at five points or more, so that the initial camber is accurately corrected by one correction operation. It is the one. The method for correcting the plate camber of the present invention will be specifically described with reference to FIG. (A) From the measured initial plate shape y ₀ , the initial curvature 1 / ρ
_Ask for ₀ . (B) Determine an optimum bending moment M for making the corrected curvature 1 / ρ = 0. The bending moment M is determined from the initial curvature 1 / ρ ₀ , the rolling position, and the plate size and physical properties, that is, the plate length L, the plate thickness t, the plate width W, the yield stress σ, and the Young's modulus E of the material. In the case of four-point bending, the bending moment M ₀ is uniform at the center. When the initial curvature 1 / ρ ₀ can be regarded as constant, ideal correction is possible. (C) The pressing device pushing amount Δy and the pushing position L ₁ in the line direction that obtain the bending moment distribution closest to the bending moment M obtained in (b) within the specifications of the rolling device are obtained. The pressing force P to be applied may be obtained instead of the pressing amount Δy. (D) The pressure is reduced by the pressing amount Δy by the pressure reducing device or by a constant pressure P, and then the load is removed.

By the straightening method according to the steps (a) to (d), a plate having an initial plate camber shape with a constant curvature in the longitudinal direction is accurately and uniformly corrected with a single correction operation. can do.

[0010]

1 is a plan view showing an apparatus according to an embodiment of the present invention,
FIG. 2 is an elevation view of a part thereof. The plate 10 for correcting the camber is conveyed by the pinch roller 4. Both ends of the plate 10 are clamped on both sides of the plate 10 by the clamp devices 1a, 1b, 1c and 1d. The position of the clamp device can be adjusted according to the length of the plate. For example, the clamp devices 1b and 1d on the right side in FIG. 1 move left and right to fix the position according to the length of the plate 10. It is supposed to do. The rolling down devices 2a and 2b are movable left and right by the positioning device 6, and adjust the distance from the clamp position to determine the rolling down position.

A plate camber was straightened using this apparatus. As shown in FIG. 4A, the plate length L and the center of the plate having the initial camber amount C ₀ are clamped in the vicinity of both ends of the plate, and the rolling down devices are arranged at two points L ₁ from the center from the clamp portion. Next, the pushing amount (rolling displacement) Δy shown in FIG. The pushing amount Δy is given as shown in FIG. 5, for example. In Figure 5, the plate material is HTP540, Young's modulus E
= 21000 kgf / mm ² , yield stress σy = 54 kg
When f / mm ² , plate width W = 400 mm, plate thickness t = 8 mm, and pressure device position is 500 mm from the clamp part, the initial camber amount C ₀ for plate lengths L = 5 m and 10 m, respectively.
It shows the relationship of Δy (mm) with respect to (mm). Table 1 is a table showing this numerically.

[0012]

[Table 1] ──────────────────────── L C ₀ (mm) Δy (mm) ───────────── ──────────── 10m 10 37.0 10m 5 34.7 10m 2 32.9 5m 10 21.2 5m 5 18.7 5m 2 16.8 ───────── ──────────────── For this plate, when L = 10 m and C ₀ = 10 mm Δ
The pressure was set to y = 37 mm, and it was corrected by one correction operation. After unloading, as shown in FIG. 4C, the post-correction camber amount δ _c ≅ ± 1 mm could be corrected with accuracy.

As described above, with the apparatus shown in FIG. 1, the clamping devices 1c, 1d,
By applying 4-point bending by the reduction devices 2a and 2b, the initial camber amount C ₀ = + 10 mm to the post-correction camber amount δ _c = ± 1 mm could be achieved. On the other hand, in the conventional three-point bending repeating method, C ₀ = 10 mm
At that time, the plate was fed with a pressing force of 35 tonf of the pressing device and was straightened 20 times for each pitch of 500 mm, and the camber amount after straightening was δ _c = ± 1 mm.

In the prior art, in one correction, the initial camber amount C ₀ = ± 10 mm to the post-correction camber amount δ _c = ±.
It was possible to make it only about 5 mm and it was necessary to repeatedly correct it. However, in the embodiment, the amount of camber δ after correction is one correction operation.
It was possible to be within _c = ± 1 mm. In addition, in the above embodiment, the case where one of the rolling down devices is movable according to the plate length has been described, but both rolling down devices may be movable devices, and a large number of devices of the same type are installed, depending on the plate length. It may be a device adapted to select and use the device.

In the above embodiment, the case where the distance between the clamp position and the reduction device is variable has been described, but the distance between the clamp and the reduction device may be fixed.

[0016]

According to the present invention, when the plate camber is straightened, both ends are clamped and pressed at two or more points, and the pressing amount of the pressing device and the pressing position in the line direction are controlled by the initial shape, and four points are applied to the plate. Since the bending is performed or the bending is performed at five points or more, the initial camber can be accurately and uniformly corrected once. Further, since the deformation is uniform over the whole, there is also an effect of preventing a local reduction in the strength of the plate.

[Brief description of drawings]

FIG. 1 is a plan view showing a plate camber straightening device of the present invention.

FIG. 2 is an elevational view showing a plate camber straightening device of the present invention.

FIG. 3 is an explanatory view showing the operation of the plate camber straightening device.

FIG. 4 is an explanatory diagram showing plate camber correction according to the embodiment.

FIG. 5 is a graph showing an example of the amount of reduction applied for straightening a plate camber.

FIG. 6 is a plan view showing a conventional plate camber straightening device.

7 (a) is a side view and FIG. 7 (b) is a plan view showing a conventional plate camber straightening device.

[Explanation of symbols]

1a, 1b, 1c, 1d Clamping device 2a, 2b Rolling down device 4 Pinch roller 6 Positioning device 10 Plate 11, 12 Pinch roller 13, 14, 15
Reduction device 21 Leveler roller 22 Flange

Claims (3)

[Claims] 1. When correcting a plate camber, both ends of the plate on the camber concave side are supported in the longitudinal direction, and two camber convex sides are supported.
A plate camber straightening method characterized in that the pressing force or the pressing amount applied to the above points is determined according to the camber amount, the plate size and the physical properties of the plate, and the pressing force or the pressing amount is applied at one time. 2. A plate camber straightening device comprising a clamp for clamping both ends of the plate and a pressing device for pressing two or more points on the convex side of the camber. 3. The plate camber straightening device according to claim 2, wherein the clamp position and the position of the reduction device are variable in accordance with the plate length.