JPS5913507A - Correcting method of camber by edger - Google Patents

Abstract

PURPOSE:To correct easily cambers and to improve productivity by rolling a material with the right and left vertical rolls of an edger at different peripheral speeds in accordance with the camber quantity of the material. CONSTITUTION:The peripheral speeds of rolls 1, 2 are made different or equal according to the distribution condition of the camber of a material 4 in its longitudinal direction. More specifically, if only the preceding end of the material is bent transversely, the peripheral speeds are varied at that part alone and the material is rolled at an equal speed except for said part. If the entire part of the material 4 is bent transversely at the same curvature, the material is rolled at the fixed different peripheral rolls. In case of the curvature differs, the difference between the peripheral speeds is changed in accordance with the curvatures. The material 4 in this stage is edged in an arrow (a) direction with the vertical rolls 1, 2, whereafter the material is horizontally rolled with horizontal rolls 11, 12, then the mill is ideally suited as a hot strip mill. If the material is edged with the rolls 1, 2 after horizontal rolling with the rolls 11, 12, the mill is ideally suited as a thick plate mill with reverse rolling. The edger is further convenient for a thick plate mill with reverse rolling if the rolls 11, 12 are disposed between two sets of the vertical rolls 1, 2 and 13, 14.

Description

Detailed Description of the Invention The present invention performs etching by changing the peripheral speed of the left and right vertical rolls, and uses the difference in rolling speed between the left and right ends to modify the camber of the material. This invention relates to a camber correction method using an edger.

The conventional method for correcting the camber of rolling stock is to measure the amount of camber created by horizontal rolling, and then adjust the gears of the left and right rolls in the next horizontal rolling bus based on this measured amount. (leveling adjustment), (1) method 1 of adjusting the biting position in the next horizontal rolling pass using a side kite, and (2) a method of producing edge elongation or medium elongation by adjusting the amount of roll henting.

However, in the first method mentioned above, the gap adjustment amount is approximately 100%.
The diameter is less than microns, and since the left and right reduction screws are generally engaged with clutches, the amount of gear adjustment is stepwise (for example, 30, 60.90 microns), and the adjustment takes time. Furthermore, since rolling is performed with different roll gaps on the left and right sides, the plate thickness after rolling differs between the left and right sides, resulting in a decrease in yield. Further, in the second method, the correction effect is extremely small by simply changing the biting position, and setting of the side guide requires skill and is time consuming.

In addition, the sixth method is originally intended for roll bending to keep the plate crown within a certain shape, so if the plate crown changes during rolling, the subsequent plate shape is likely to be defective, so it cannot be put to practical use. Furthermore, as with the first method, there were drawbacks such as side-to-side deviation in plate thickness, resulting in a decrease in yield.

The present invention has been made in order to eliminate the drawbacks of conventional camber correction methods. - It is related to the correction method, and it is possible to easily correct the camber of the material without worrying about the occurrence of left-right plate thickness deviation or changing the plate crown ratio in the conventional method, and it also combines horizontal rolling. This has the advantage that it is possible to obtain a pressure plate with a good plate shape and no camber.

The present invention will be described in detail below, and then embodiments will be described with reference to the drawings. As shown in Figure 1, the left and right vertical rolls (1) and (2) of the edger have different roll peripheral speeds τl.
+”2 (however, '+71>υ2) to obtain a straight material (
When material (3) is rolled in the direction of arrow a, material (3) comes out curved toward the υ2 side (low speed side) as shown by the broken line. Therefore, as shown by the broken line in Fig. 2, a material (4) with a camber (sideways bend) on the edge entry side is used as a vertical roll (1) with a different roll circumferential speed vl + v2 (where υ1>υ2).
When rolled at different circumferential speeds by (2), the material (4) produces camber toward the low-speed roll (2) and corrects the entry side shape.
Straight material comes out on the exit side.

The present invention utilizes the above-mentioned rolling phenomenon to create different cambers (
However, during rolling at different circumferential speeds, dog bones (5) and (6) shown in FIG. 3 are generated as in the case of conventional constant speed rolling. Therefore, in order to obtain a product with a rectangular cross section, horizontal rolling is performed after rolling at different circumferential speeds. However, since the amount of dog bones generated by different circumferential speed rolling is different at the left and right ends of the material (4), this material is rolled horizontally to form a rectangular shape. If the cross-sectional shape is obtained, the amount of elongation on the left and right sides will be different and camber will occur again. Therefore, when rolling at different circumferential speeds, a camber correction wind is set so that the amount of camber after horizontal rolling is zero or a target value, and a difference in roll circumferential speed is applied corresponding to this. A general process for obtaining a rectangular cross-section material without camber is shown in FIG. That is,
First, the amount of camber is detected 7), then the circumferential difference between the left and right rolls of the edger is calculated 8), then the edger performs rolling at different circumferential speeds (9), and finally horizontal rolling 00) .

However, the gist of the present invention does not require all of the processes shown in Figure 4, and the core technology is to roll the material at different peripheral speeds by applying a peripheral speed difference between the left and right rolls during etching. The point is to correct the camber of.

In addition, in edger rolling at different circumferential speeds, the circumferential speed of the rolls is changed according to the distribution of camber in the longitudinal direction of the material.
Alternatively, it is natural to make the speed constant. Namely, if only the tip is horizontally curved, that part is rolled at different circumferential speeds and the rest is rolled at constant speed; ■If the metal body is horizontally curved with the same curvature, fixed rolling at different speeds is applied. (2) If the curvatures are different, change the difference in circumferential speed depending on the curvature. That is, since it is only necessary to set the roll circumferential speed difference in accordance with the camber amount, fine corrections can be made continuously and the productivity of the rolling operation can be improved.

Next, embodiments of the present invention are shown in FIGS. 5 to 7. Fifth
The figure shows the material (4) using the vertical roll (1) (21)
After edging in the direction, horizontal rolling is performed using a horizontal roll circle (12), and it is suitable for a Holatos lip mill, etc., and can also be applied as part of the rolling pass of a plate mill that performs reverse rolling.

Figure 6 shows material (4) being rolled horizontally in the direction of arrow α using horizontal rolls QIHI2) and then edged using vertical rolls (1) and (2), which is ideal for plate mills that perform reverse rolling. . Regarding the order of etching and horizontal rolling,
Generally, it is better to have the material bitten by horizontal rolling after being etched, and if it is bitted by an edger after horizontal rolling, there is a tendency for poor biting to occur. Therefore, in this case, either set the vertical roll opening wider than the required opening and close it after biting, or move the center of the edger while setting the vertical roll opening to the required opening. Some effort is needed.

Figure 7 is a combination of the arrangements in Figures 5 and 6, with two sets of vertical rolls (1), (2), (131αa) and horizontal rolls (Ql) (121) arranged between them. .

This arrangement is conveniently applied to plate mills that perform reverse rolling.

It should be noted that the present invention is not limited only to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

Since the camber correction method using an edger according to the present invention has the above-described configuration, it exhibits the following excellent effects.

(1) Since the roll circumferential speed of the left and right vertical rolls is changed to perform rolling at different circumferential speeds, it is possible to avoid deviations in left and right plate thickness in the conventional left and right gap adjustment method, and to change the plate crown ratio in the roll heading adjustment method. The camber can be easily corrected without any trouble, and a material with good plate shape and no camber can be obtained.

(1) Fine-grained camber correction can be made in response to camber accommodation, and camber correction settings can be made continuously, resulting in high productivity.

(iii) By combining different circumferential speed rolling and horizontal rolling, it is possible to simultaneously correct the camber and make the planar shape of the plate rectangular, thereby reducing side crop and end crop losses. . Therefore, it is possible to improve the yield of rolling work and contribute to energy saving and resource saving.

[Brief explanation of the drawing]

Figures 1 and 21 are explanatory diagrams showing the principle of the present invention, Figure 2 is an explanatory diagram showing the occurrence of dog bones, and Figure 4 is a general procedure for obtaining a rectangular cross-sectional material without camber. A block diagram showing the seventh step, and FIGS. 5 to 7 are plan views showing an embodiment of the apparatus to which the method of the present invention is applied. In the figure, (+) (2) 03) (14) is a vertical roll, (4) is a cambered material, (I ]) (12
) is the horizontal roll, υ1. τ2 is the roll peripheral speed. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Vl) V2 Vl) V2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1) An iE method for camber repair using an edger, which comprises changing the circumferential speeds of vertical rolls on the left and right sides of the edger to perform rolling at different circumferential speeds. 2) Adjust the camber of the material to the left and right vertical rolls of the edger.
A camber correction method using an edger, characterized in that the edger performs etching by applying a roll circumferential speed difference set based on the amount of roll, and then performs horizontal rolling.