JPS6083723A - Shape reforming device of metallic strip plate - Google Patents

Abstract

PURPOSE:To reform greatly a bending effect by pinching a plate by a holding roll whose surface is constituted of an elastic material, and a bending roll. CONSTITUTION:When bending a plate 2, a bending roll (made of steel) is used, this bending roll 1 is brought into sufficient contact with the plate 2, and the plate 2 is pinched by a holding roll whose surface is constituted of an elastic material such as rubber, and the bending roll 1, so that substantial bending can be executed. In this way, the surface of the soft side roll 9 is deformed elastically, and the plate 2 is pressed against the hard bending roll 1, by which contact of the plate 2 and the bending roll is becomes surface contact, and the plate 2 is bent to a curvature which is equal to a curvature of the roll.

Description

[Detailed description of the invention] [Usage for ordinary work” υ The present invention relates to a shape correction device for a metal band plate.

[Prior art]

When using a leveler for shape correction of metal strips, cutting plates (hereinafter referred to as plates), and crimp steel strips, if the target plates are thin and hard, plastic strain may occur in the plates unless the diameter of the bending roll is made smaller. I can't get into it and correct it. For example, steel sheets with a thickness of about 0.2 mm, used for beverage cans, etc., as-rolled steel sheets (full hard materials) that are galvanized and used on the r side of roofing materials, etc. In this case, it is necessary to use a small-diameter bending roll with a diameter of 20 to 30.7 cm, and to increase the tension from the yield point of the plate, which is a few tens of inches, to several tens of inches.

By the way, when straightening a plate, there is a big difference between the curvature of the roll used for bending and the actual curvature of the plate, and in general, the curvature of the plate is much smaller than the curvature ( It is normal for the board to not fit into the roll. Since the plate is difficult to fit into this roll, it is necessary to make the roll diameter smaller than that required by bending theory.
It becomes necessary to apply excessive tension.

Applying this excessive tension causes the plate to break easily, and the number of pridle rolls increases, resulting in an increase in equipment costs.

In addition, by using small diameter rolls, multiple backup rolls are required to prevent deflection of the small diameter rolls, which necessitates widening the distance between the rolls and significantly reducing the amount of insertion of the bending rolls. Since the distance between the rolls is very large, the winding angle to the rolls must be sufficient, otherwise the winding angle must be set to a small diameter roll using tension. Instead, there is a known fluid repeller that sprays high-pressure fluid onto the board to bend it and correct its shape. This method of spraying fluid 1l-1 has the advantage of making it easy to obtain a large curvature with the same tension, but the energy required to spray the fluid is extremely large, and the fluid thickens on the plate, making it difficult to prevent sagging. However, the present invention has disadvantages such as requiring equipment such as a layer for removing fluid from the plate. [Object of the Invention] The present invention is directed to a tension repeller for bending plates using thin and hard materials. Trouble! In addition to solving problem 4, we provide a complete straightening machine (repeller) for hot-rolled steel strips with large thicknesses, and a straightening machine (repeller) for cold-rolled ψ (1 N) that can also be used as a roller repeller for 1N steel strips. do.

[Configuration 1 of the Invention] The feature of the present invention is that, as shown in Fig. 1, a bending roll (manufactured by...
A press roll 9 whose surface is made of an elastic material such as rubber is sandwiched between the bending roll and the plate so that the plate can be sufficiently brought into contact with the plate to perform substantial bending.

In FIG. 1, 3 is the elastic body of the presser roll 9, 4 i,
J: Axial center.

That is, in the present invention, a bending roll is arranged on one of the pass lines of the plate, and the elastic modulus of the material of this bending roll (general rolls use steel, so the elastic modulus of 21000 kpf/TI
The board is sandwiched between the bending roll and an FC roll (referred to as a press roll) whose surface is made of a coating material (for example, rubber such as urethane rubber, or synthetic resin such as polypropylene) having an elastic modulus smaller than J). The bending roll and presser roll constitute a set of rolls.
This is a shape straightening device for metal plates, which plastically bends the plate by passing the plate through the gap between the two rolls.

For example, as shown in FIG. 3, the roll pairs of the present invention include upper and lower rolls l with respect to the pass line of the steel plate.

By arranging multiple sets of 9 with opposite elastic coefficients, repeated bending can be performed and a repeller can be constructed.

With this repeller, even a straight ξ line can be bent, unbended, and reversed.

The principle of sheet bending using a pair of rolls according to the present invention is that the surface of the soft roll is elastically deformed and pressed against the root-hard bending roll, so that the contact between the sheet and the bending roll becomes surface contact, albeit in a rough manner, and the sheet is rolled. It is to bend to a curvature equal to the curvature.

In the conventional repeller, the winding force of the plate on the bending roll is generated in proportion to the product of 5 inO of the contact angle θ between the roll and the plate and 1 additional force T, but in the present invention, it is Regardless of tension or contact angle, desired bending conditions can be achieved simply by adjusting the pressing force of the presser roll. In particular, in the conventional ・＼rah, when the degree of deformation of a song changes, it affects the tension, and the tension gives a cedar # to the degree of bending, so it is difficult to calculate i4 for control, but with the present invention, The bending deformation becomes a function only of the pushing force (depending on the plate material, plate thickness,
(assuming the material of the elastic body is constant), it can be controlled accurately with very simple calculations.

The 6th M shows the results of an example in which the sheet was bent in the KL direction using the roll configuration of the present invention. In this example, the small diameter of the bending roller is 250 mm, the presser roll diameter lj is 260 fins, and the surface material of the presser roll is 6 if it is neosolene rubber, 7 if it is urethane rubber, and 8 if it is polypropylene. . As can be seen from this figure, as the pressing force of the rolls increases, the board begins to warp (enters the plastic ridge area) and the height of the ridge increases, and eventually the height of the warp increases. It changes to a constant value and becomes saturated. In this way, the first thing to do is to bend the board into the bending roll, and then bend it to the roll.
The fact that the height of the heel at saturation remains constant even if the elastic modulus of the surface material of the presser roll is different also facilitates control in the straightening device of the present invention.

By changing the pressing force, you can make fine adjustments of about 5 degrees of bending by using the parts where the plate warps.

Next, the roll diameter of the present invention will be described.

First, the bending roll diameter DI must be smaller than the yield roll diameter determined by the following formula based on plate bending theory.
(, f), < 1),) where t: thickness of plate ++o
n), E: elastic modulus of the plate (kq f /rtrA) σ. : Yield stress of plate (kgf/IllΔ), De: Yield roll diameter (throat) There is no particular restriction on the minimum roll diameter as long as it is within the range that allows the backup roll to prevent roll deflection. With conventional levelers, the curvature was set to a smaller diameter than necessary because the curvature of the plate did not match the roll diameter, but with the present invention, this can be done by 1 inch.

Next, the diameter D2 of the presser roll will be described. Same pushing amount 5 and presser roll diameter Dz? The contact width t between the plate and the elastic body when given/is the bending of the plate i, 1.11.
l,, simple geometry '4 if you ignore the filling of the elastic body
: Target:V:] From the staff L 2r1 汀-Tj-,-(
2) Multiply by Therefore, if D2 becomes thicker, t becomes larger. The bending moment 1 that causes bending deformation on the plate is proportional to the contact width t and the pressing force P, so the roll diameter D
2id larger one is the same - push 1~include lr, t)
U is easy to bend 5 Therefore, there is no limit to I011 where the presser roll has a large diameter. As D,... becomes a small path.

As the contact width becomes smaller, the bending moment decreases, but the pushing amount and pressing force are increased by that amount, and the stability is good, so there is no restriction on the small diameter side unless there are problems in manufacturing the roll. .

Next, the elastic modulus of the elastic body that is the surface material of the presser roll will be described. If the elastic deformation of the roll is small on the bending roll side and large on the presser roll side, the width of contact with the plate changes between the front and back of the plate, creating a bending moment', causing the plate to bend toward the bending roll. If this bending moment is the bending moment required to yield the plate, it is possible to give a plastic surface to the plate, and it can be used as the basis for plate straightening devices and bending devices. For this reason, it is necessary that the elastic modulus of the surface material on the pressure roll side is smaller than that of the five-bending roll. This condition can be easily met by using an organic material such as rubber or synthetic resin as the surface material of the presser roll. Further, even gold-based materials can be used if the structure is such that the elastic modulus is sufficiently smaller than that of two bending rolls.

As can be seen from the results described above, the basic shape of the present invention is a sheet bending machine, which can replace the conventional 30-rule bending machine. In a 30-roll bending machine, the bending moment is applied by three rolls, but in the present invention, the bending moment is applied within the contact width between the two rolls. For this reason, even if the bending moment given to 1.1-ton (4λ1) is the same in the conventional bending 4λ1 and the present invention, the length of the bending moment Diii is significantly different. Since the length is determined by the shape of the plate between the three rolls, bending of plates with a strong yield point phenomenon (such as those before skin pass rolling of hot or cold-rolled steel plates) causes buckling.

1iN 41r21 Phenomenon 1. When the strain concentrates on a certain point on the board and bends n1, the bending moment suddenly decreases and bends n1.
The plate around fc does not deform, but when the bent part advances to a certain extent, the bending moment suddenly increases again.
The next point is a cyclical phenomenon in which the bending point υ continues for a while, and the bending point n2 can be recognized with the naked eye using a conventional bending machine. In contrast, in the present invention, the bending moment is applied in a very small range, and since the arm length of the bending moment is short and the length of the arm is -, the bending does not occur (even if it does occur, the bending moment does not occur). This f
Even if a board with a conventional roll bender has a bend f, the present invention does not cause a bend n in the 2'L.

Table 1 shows the results of each bending process. The metal strips used in this example and comparative examples were made of continuous low carbon steel. The yield point elongation before the skin pass was 3φ for the blunt warped material.

Moreover, the implementation conditions are as follows.

Next, an example of the configuration of a correction device using the basic shape of the present invention will be described.

First, the roll repeller device shown in FIG. 3 described above can be constructed. In this figure, the diameter of the bending roll 1 is increased in order from the entrance side, but good correction can also be achieved by reducing the pressing force of the presser roll instead of changing the diameter of the bending roll.

Next, Fig. 2 shows a configuration in which there is only one pressing roll 9 and bending rolls are arranged in a planetary manner on the presser roll 9, and it is said that by combining such devices, it is possible to construct a repeller that occupies less space. There are advantages.

FIGS. 4 and 5 show an example of a backup roll 5 that prevents the bending roll 1% pressing roll 9 from deflecting in the sheet width direction. In FIG. 5, the presser roll 9 side is made larger in diameter and the backup roll is omitted, resulting in 7t [IJ]. In the present invention, the presser roll side can be made larger as described above, which is advantageous in terms of preventing roll deflection. Further, since the deflection of the presser roll can be predicted if the presser roll is operated with a constant pushing force, it can be substantially prevented by providing a crown to the roll in advance.

Embodiment 2 The conventional tension leveler shown in Fig. 7 has a configuration in which 'ag' is inserted, and it is composed of R, -R5 and mounts shown in Fig. 8.
Table 2 shows the results of shape correction examples using the repeller of the present invention, which bends the plate at tl, respectively.

In this example of correction, in order to eliminate the plate groove in the longitudinal direction, at the original tension level 2-, the push-in valve (intermesh) of the fifth roll R5 is inserted.

In the present invention, the pressing force of the fifth roll, the pressing roll 1t6, is adjusted.

The steepness of the board before straightening (the value obtained by dividing the height of the waves in the longitudinal direction by the period of the waves) is the same as that of the board before straightening. 05 folds begin to appear at 20% or more of the yield point of the plate, but in the present invention, the shape improves from a point where the tension is extremely low.

The bending effect of the present invention is sufficiently strong within the board,
It is thought that the bending deformation has occurred up to IS.

Table 2 Steepness (%) after correction using a tension repeller [Effects of the invention] The metal band shape correction device according to the present invention has a large bending effect even when the shape is corrected with low tension, resulting in a large shape correction. This is extremely advantageous.

[Brief explanation of the drawing]

Company 11 An explanatory diagram showing a pair of A rolls, which are a bending roll and a pressing roll whose surface is made of an elastic body, in the basic shape of the present invention. Figure 2 shows one elastic roll. An example of the configuration of the shape correction device in the book ``Il'isu 4'', in which bending rolls are arranged in a planetary manner on the windshield, is shown in Figure 3. Figure 4 is an explanatory diagram of the configuration of the other side of the shape straightening device of the present invention, and Figure 4 is an explanatory diagram of the configuration in which multistage backup rolls are installed to prevent deflection in the straightening machine of the present invention. In the straightening machine,
To prevent deflection, increase the axis of the elastic roll to 1
+4 H, No. 61-1 (-A diagram showing the relationship between the 1-plate groove 9 and the pressing force of the elastic roll. Figure 7 shows the conventional tension as a comparative example. FIG. 8 is an explanatory diagram showing the roll arrangement r# of the leveler, and FIG. ...Press roll! (Blood material, 9...Press roll agent, Patent attorney Masa Akizawa, Mitsugai 2 persons, 1 day soup, 2 drawings, 3 drawings, 4 drawings, 5 UiU, 6 square bullets) Raw Ihon Roll O Ko Discipline sword 7 days A'8 drawing p.

Claims (1)

[Claims] (1) A metal band plate characterized in that a bending roll and a pressing roll whose surface is made of a material having an elastic modulus lower than that of the bending roll surface are provided at positions that sandwich the metal band plate. shape correction device.