JPS58168435A - Straightening method of steel plate - Google Patents

Abstract

PURPOSE:To efficiently straighten a steel plate, by providing >=1 pinch rolls on the entry and delivery of a roll leveler, and >=1 leveling rolls on he horizontal face and vertical face so they can be tilted. CONSTITUTION:On the entry and the delivery of a roll leveler 11, an axial force adding pinch roll 12 and an axial force adding pinch roll 13 are provided, respectively, and by the pinch rolls 12, 13 and the roll leveler 11, plastic elongation is given to a material 14, and the flatness is reformed. Also, >=1 leveling rolls are provided on the horizontal face or the vertical face, or on both the horizontal and vertical faces so that they can be tilted, and by this leveling roll which can be tilted, plastic elongation to the left and right of the material 14 is varied, and the camber is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a roller leveler to improve the shape (flatness, etc.) of a steel plate.
Concerning methods for correcting warpage and camber.

As shown in Figure 1, poor flatness of a hot-rolled steel plate is caused by poor shape during b-medium stretching (a), re-stretching (b), mid-stretching + re-stretching (C), and L warping (d). ), C warpage (＠ri,
), and these are generally corrected using a roller leveler.

In straightening the flatness of a steel plate using a conventional roller leveler, a large number of leveling rolls (11) arranged in a staggered manner as shown in Fig. 2 repeatedly bend the steel plate to flatten it, thereby uniformizing and reducing the internal stress distribution. (This is a pinch roller.

However, since conventional roller levelers are correction devices that mainly focus on correcting warpage (especially L warpage) and reducing residual stress, corrections for shape defects such as mid-stretching and re-stretching are not sufficiently performed. The above shape defect is caused by the difference in the length of the plate, and cannot be corrected unless plastic elongation is applied.In conventional roller levelers, the residual stress in the plate wall and the frictional force between the roll and the steel plate act as a slight axial force. Basically, it is not possible to impart plastic elongation to the steel sheet, so it is medium elongation.

Shape modification ability such as re-stretching is low. Furthermore, since conventional roller levelers cannot change the curvature of the inside and outside of the steel plate during leveling, it is difficult to correct camber.

This invention was made in order to solve the above-mentioned conventional problems, and proposes a method for straightening steel plates that can improve the effect of correcting shape defects such as mid-stretching and re-stretching of steel plates, and can also correct camber using a leveler. It is something to do.

The gist of the invention is to provide at least one pinch roll for applying an axial force to the front or rear of the roller leveler, or both.
At least one of the leveling rolls is provided so as to be tiltable in a horizontal plane or a vertical plane,
The axial force of the pinch rolls and the bending of the leveler apply plastic elongation to the material to correct flatness, and the tiltable leveling roll changes the left and right plastic elongation to correct the camber, In addition, the pinch roll is provided so as to be tiltable in a horizontal plane, a vertical plane, or both horizontal and vertical planes, and the pinch roll and leveler apply plastic elongation to the material to correct flatness and change the left and right plastic elongation. In addition, the pinch roll and leveling roll are both tiltable in a horizontal plane or vertical plane, or both horizontally and vertically, and the pinch roll and repeller give plastic elongation to the material. A method for straightening a steel plate, which is characterized by correcting flatness and correcting camber by changing the elongation from side to side using a vinyl roll or a leveling roll.

This invention method will be explained in detail below.

In order to correct shape defects such as intermediate elongation and re-elongation of a steel plate using a roller repeller, it is sufficient to impart plastic elongation to the material. However, as mentioned above, with conventional roller levelers, residual stress and frictional force between the rolls and the material only act as a slight axial force, and basically they cannot impart plastic elongation, so shape correction cannot be achieved satisfactorily. . Therefore, in this invention, a method using pinch rolls was adopted as an axial force applying means for imparting dusty elongation to the material.

Pinch rolls are also installed in conventional roller levelers, but since conventional pinch rolls are used only to feed the plate, the rolling load is small and the plate feeding speed is the same as that of the leveling roll. Therefore, conventional pinch rolls cannot impart greasy elongation to the material during leveling. Therefore, in this invention, the pinch roll has a strength that increases the rolling load, and furthermore, the pinch roll circumferential speed is slower on the entry side than the leveler circumferential speed.
A method was adopted to give plastic elongation to the material by applying backward tension and/or forward tension early on the exit side.

FIG. 3 shows an embodiment of the present invention. (River indicates a roller leveler, α force indicates an input pinch roller, and Oat indicates an output pinch roller. In other words, in this invention, a roller leveler (input side of llj) Alternatively, a pinch roll for applying ζ-axis force on the exit side or both sides is provided to apply backward tension and/or forward tension to the material being leveled to give plastic elongation.In this case, the pinch roll αSaW and the material If the coefficient of friction with I is 0.2, it is necessary to use a rolling blade that is 5 times the additional tension. Therefore, if one pair of pinch rolls is insufficient, use multiple pinch rolls as shown in Figure 3. Axial force is applied by rolling down with a set of pinch rolls and changing the leveler and circumferential speed.

Next, to explain the camber control method, conventional leveling rolls are arranged perpendicular to the longitudinal direction of the material and cannot be tilted in the horizontal or vertical plane, so the material The inner and outer curvature of cannot be changed. For this reason, it was almost impossible to correct the camber during leveling. Therefore, in this invention, as a method of changing the inner and outer curvatures of the material, at least one leveling roll is provided so as to be tiltable in a horizontal plane or a vertical plane, and the amount of left and right plastic deformation is determined by this tiltable leveling roll. We adopted a method of leveling by changing the.

The diagram in Figure 4a shows the conventional leveler (50
This is the measurement result of the camber amount Δb when a tilting mechanism was installed on all 11 leveling rolls using φ From this chart, it can be seen that camber is generated by changing the amount of horizontal reduction of the leveler, and that camber correction is possible.

In addition, the inventors installed a pinch roll for applying axial force on the exit side of the leveler, and leveled the aluminum plate while applying axial force at a speed 0.2% faster than the leveler, and the leveling roller When the amount of camber was measured when the pinch roll was set at an angle θ in a horizontal plane, it was found that the camber could be controlled by adjusting the angle of inclination as shown in the 1st percent. In this experiment, the leveling roller and the pinch roll were tilted, but it goes without saying that camber control is possible with either one.

The above experimental results show that the camber control means may be either a method of changing the horizontal reduction amount of the leveler or a method of tilting the leveler or pinch roll. Therefore, there is a method of changing the amount of horizontal reduction of the leveler,
It goes without saying that if the method of tilting the leveler or pinch roll is combined, the camber control will be further increased.

Here, an example in which this invention method is applied to an actual machine will be described.

[Example 1] Pinch rolls for applying axial force having a roll tilting mechanism were installed on the entrance and exit sides of a 50φ x 11 roller leveler with a leveling roll tilting mechanism, and the thickness was 3 m x width 3
Q Q W
When leveling with a speed difference of 0.12%
plastic elongation was obtained and the flatness was significantly improved.

Next, when leveling was carried out under the same conditions as above with the leveler left and right reduction amount difference set to 1.5, a camber of 1.25 gg/4 m occurred.Subsequently, when the leveler was tilted 3 degrees in the horizontal plane, 1. A camber of 5W/4m occurred. When I leveled the material in Part B again with a difference in the amount of reduction between the left and right levelers of 1.5 degrees, the camber was almost corrected.

In addition, when a material with a camber of 1.2 Ml/4111 as described above was leveled by tilting the repeller 0.5 degrees in the vertical plane, a camber of 0.7111741111 was generated, and the material was lowered from side to side by the leveler. Volume difference 1.0
When leveling with 11g, the camber was almost corrected in this case as well.

[Example 2] Using the same equipment as in Example 1, an aluminum plate with good flatness obtained by leveling with plastic elongation under the same conditions was rolled with a pinch roll on the exit side in a horizontal plane while leaving the leveler as it is.
．． When I leveled it by tilting it 5 degrees, it was 0.8111
/4 solution camber occurred.

When this material was leveled again by tilting the pinch roller 1.8 degrees in the opposite direction within the horizontal plane, the camber was almost corrected.

In addition, when the same material with a camber of 0.8111/411 as above was leveled again by tilting the peak-side pinch roller twice in the vertical plane, the camber was almost corrected in this case as well.

[Example 3] Using the same equipment as in Example 1 and leveling with plastic elongation under the same conditions, an aluminum plate with good flatness was obtained with a difference in the amount of reduction between the left and right repellers of 1. When the material was leveled as OM and the difference in the left and right reduction of the Vinci roll was set to 1.0, a camber of 1.5 cm/4 m occurred. When leveling was carried out by setting the difference in the amount of roll reduction between the left and right sides at 1.2■, the camber was almost corrected.

As explained above, according to the method invented by Jin, it is possible to give plastic elongation to the material during leveling, so it is possible to obtain a much sharper shape correction effect than with conventional levelers, and also to reduce the inner and outer curvature of the material. Since it is possible to change the camber, it is possible to easily correct camber, which has been difficult in the past. The kerat makes it possible to straighten high-strength materials, which was previously impossible, and has a great effect on straightening steel plates.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of shape defects occurring in a steel plate, Fig. 2 is a side view schematically showing a conventional roller leveler, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 a. 114 is a chart showing the relationship between the leveler reduction fit difference and the camber amount in this invention, and FIG. 11...Roller leveler, 12.13...Vinch roll for applying axial force, 14...Material. Applicant Sumitomo Metal Industries Co., Ltd. Agent Push 1) Good Each "II Figure 1 Figure 2 Figure 3 Figure 4, Reduction amount difference Inclination angle e bar

Claims (1)

[Claims] l At least one or more pinch rolls for applying axial force are provided on the inlet side or the outlet side of the roller repeller, or at least one or more leveling rolls are provided in a horizontal plane, in a vertical direction, or horizontally. , is provided so as to be tiltable on both vertical sides, and the pinch roll and repeller apply gravity elongation to the material to correct flatness, and the tiltable leveling roll changes the gravity elongation on the left and right sides of the material to correct camber. A method for straightening a steel plate, which is characterized by a straightening hole. 2. Providing at least one pinch roll for applying axial force on the entry side or exit side of the roller repeller, or both, and providing the pinch roll so as to be tiltable in a horizontal plane or in a vertical direction, or in both horizontal and vertical directions, A method for straightening a steel plate, characterized in that the tiltable pinch roll and leveler apply gravity elongation to the material to correct flatness, and also correct camber by changing the amount of left and right plastic deformation. 3 At least one pinch roll for applying axial force is provided in front of or behind the roller leveler, or in front of the roller leveler, and the pinch roll is provided so as to be tiltable in a horizontal plane or in a heavy A, or in a horizontal or vertical direction, and also for leveling. At least one or more of the rolls is provided so as to be tiltable in a horizontal plane or in a vertical direction, or in both horizontal and vertical directions, and the pinch roll and leveler apply gravity elongation to the material to correct its flatness, and the pinch roll Alternatively, a method for correcting the shape of a steel plate, characterized in that the camber is corrected by changing the amount of left and right plastic deformation using a tiltable leveling roll.