JPH0245926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Technical Field) The present invention relates to a shape correction device for a metal band plate.

(Prior Art) A shape straightening device for metal strips, which is used to treat metal strips, especially hard and relatively thin metal strips with distortions that are difficult to correct, is disclosed in the patent application filed by the applicant. It is disclosed in Publication No. 59-144525.

As shown in FIG. 7, a roll bending device 4 is installed upstream of the roller leveler 3 and includes work rolls 5, 5' for roll bending, which have a smaller diameter than the work roll 1 of the roller leveler 3 and are smaller in number than the work rolls 1 of the roller leveler 3. One or more work rolls 5, 5' for roll bending can be moved up and down, and the interval between the upper and lower work rolls 5, 5' can be adjusted.

By combining the improved roll bending device 4 with the ordinary roller leveler 3 in this way, it has become possible to effectively use the roll bending device even with a relatively thin metal strip.

(Problems with the Prior Art and Objects of the Invention) In the roller leveler having the work rolls 5, 5' for roll bending in the shape straightening machine for metal strips as described above, the work rolls 5, 5' for roll bending. Due to the strong processing curvature of the metal strip, warpage in the width direction as shown in FIG. 2 occurs. Even if the partial distortion can be corrected in this way, the shape will not be completely corrected because warpage in the width direction will occur. The present invention aims to provide a shape correcting device for a metal band plate that does not cause warping in the width direction and has roller specifications that can sufficiently correct partial distortion.

(Solution by the Invention) A small number of roll bending work rolls having a smaller diameter than the work rolls of the roller leveler are provided upstream of the roller leveler, and one or more of the roll bending work rolls can be moved up and down. , and among the work rolls for roll bending, a deflector roll is provided which has a larger diameter than the work roll on the most exit side, and this deflector roll has a dimensional range of 1.5 d when the diameter of the work roll on the outmost side is _d3 . ₃ ≦D≦5d ₃ ... (1) L≦3 (d ₃ + D) ... (2) However, D: diameter of the deflector roll, L: center-to-center distance between the work roll on the most exit side and the deflector roll is satisfied. It was installed in the position.

(Example) In FIG. 1, 11, 12, and 13 are work rolls of the roll bending device 10. These work rolls have approximately the same diameter for the purpose of roll management, compatibility, etc. (d ₁ ≒ d ₂ ≒ d ₃ ), and the diameter D on the exit side of the roll bending device 10 and the roll diameter d of the final work roll 13 Deflector rolls 14 larger than ₃ and less than 5 times are provided.

Deflector roll 14 is the final work roll 13
It is desirable to install it in the opposite direction beyond the sheet passing position, that is, below the sheet passing position. This is because when this deflector roll is not used, it can be used as a table roll.

The reason why the diameter of the deflector roll 14 is made larger than that of the final work roll 13 will be explained with reference to the graphs of FIGS. 3 and 4. Fig. 3 is a graph showing the relationship between the rolling reduction amount and the amount of width warpage, based on actual measurement results using a testing machine with a work roll diameter of 30 mm. Looking at the amount of warping in the width of each deflector roll with a diameter of 30, 45, 60, and 90 (mm), it is possible to obtain a product with a small amount of warping when using a deflector roll with a diameter of 90 mm, that is, three times the work roll. It tells the story of what is possible. However, if the diameter of the deflector roll greatly exceeds five times the diameter of the work roll, it is undesirable for reasons such as restrictions on equipment costs, installation space, or center-to-center distance L between the final work roll and the deflector roll.

Figure 4 shows the measurement results of width warping when the bending tension was changed in the opposite direction using three types of deflector rolls with diameters of 60 mm, 100 mm, and 160 mm after bending with a work roll of 60 mm in diameter. In this case, when the tension condition, that is, the bending tension changes from 1.0 Kg/mm ² to 3.5 Kg/mm ² to 10.8 Kg/mm ² , the roll diameter is the same, that is, the work roll is 60 mm, and the deflector roll is also 60 mm. It was found that the amount of width warpage was large, which was not desirable. On the other hand, it can be seen that if the diameter of the deflector roll is the maximum diameter, this is also undesirable.

Final work roll 13 and deflector roll 14
If the distance L between the centers exceeds 3 (d ₃ +D) at the longest, it is not preferable for the following reasons, and good flatness cannot be obtained.

(1) The curvature of the metal strip on the work roll 13 becomes smaller, and the number of effective rolls decreases, resulting in a decrease in shape correction effect.

(2) The bending of the metal strip by the deflector roll 14 becomes extremely small, and width warping tends to occur.

In general, it is very difficult to correct width warpage using a roller leveler, and the rolling reduction amount of a roller leveler is 0.8 at the entry side.
A yield range of more than 10% is required. On the other hand, longitudinal warping is relatively easy to correct, and it is sufficient to set the reduction amount to meet the yield range condition of 0.2 to 0.4 or more.

In this type of correction mechanism, it is important to increase the tension value between the roll bending part and the roller leveler part in order to improve the crowning effect. The roller leveler side bends the material to be processed by itself, so it must supply bending work to the material to be processed. The limit to which power can be transmitted is determined by the reduction amount conditions of the roller leveler. From these relationships, the tension that can be applied between the deflector roll portion and the deflector roll portion is obtained by subtracting the power consumed for bending work from the power that can be transmitted. A conceptual diagram is shown in FIG. Moreover, the measurement results of the maximum tension value depending on the rolling reduction amount conditions are shown in FIG.

As can be seen from these figures, it is not preferable to set a large rolling reduction amount for the roller leveler from the viewpoint of applying maximum tension. The optimum value is about 0.60 in the yield range for the roll group on the entry side of the roller leveler. Although it is possible to correct longitudinal warpage under such a light reduction amount condition, it is impossible to correct strong width warpage that occurs in the work roll portion for roll bending. Therefore, it is necessary to minimize the occurrence of width warpage in the work roll for roll bending and the deflector roll portion.

In FIG. 5, P and W are given by the following equations.

P: The maximum work that can be transferred from the roll to the material in a roller leveler, expressed in unit tension of the material P = 2 μF/tB (Kg/mm ² ) μ: Masatsu coefficient F: Main leveler reaction force (Kg ) t: Plate thickness (mm) B: Plate width (mm) W: Work consumed in bending work with a roller leveler expressed in terms of unit tension of the material W = w x 6120/V・t・B (Kg/mm ² ) w: Bending work (kw) V: Straightening speed (m/mm) (Effects of the invention) When the bending work roll diameters were the same, width warping occurred. In contrast, the present invention provides a deflector roll having a diameter larger than that of the work roll on the outermost side among the work rolls for roll bending, and the deflector roll has a diameter of 1.5d ₃ when the diameter of the work roll on the outermost side is d ₃ . ≦D≦5d ₃ L≦3 (d ₃ +D) However, since it is installed at a position that satisfies D: diameter of the deflector roll, and L: center-to-center distance between the work roll on the outermost side and the deflector roll, the The width warpage is stable and extremely low, making it possible to perform stable flatness correction with good operability.

[Brief explanation of the drawing]

FIG. 1 shows the orthodontic device of the present invention. FIG. 2 shows the width warpage of the metal strip. Figure 3 is a graph showing the relationship between the rolling reduction amount and the amount of width warping. Figure 4 is a graph showing the relationship between the roll diameter and the amount of width warping. Figure 5 is a conceptual diagram of allowable tension. Figure 6 is a graph showing the relationship between main leveler entrance conditions and allowable tension. Figure 7 shows a conventional orthodontic device. In the figure: 1... Work roll, 2... Backup roll, 3... Roller leveler, 4... Roll bending device, 5, 5'... Work roll for roll bending, 10... Roll bending device, 11, 12, 13...work roll, 14...deflector roll.

Claims (1)

[Claims] 1. A small number of roll bending work rolls having a smaller diameter than the work rolls of the roller leveler are provided upstream of the roller leveler, and one or more of the roll bending work rolls can be moved up and down. , and a deflector roll 14 having a diameter larger than the work roll 13 on the most exit side among the work rolls for roll bending is provided, and the deflector roll 14 has a diameter of 1.5d ₃ when the diameter of the work roll on the outmost side is d ₃ . ≦D≦5D ₃ ...(1) L≦3(d ₃ +D) ...(2) However, D: Diameter of the deflector roll 14, L: Center-to-center distance between the work roll on the most exit side and the deflector roll, Above A metal band shape correction device characterized by being installed at a position that satisfies formulas (1) and (2).