JPS60196204A - Edging method of plate material - Google Patents

Abstract

PURPOSE:To produce a plate material which is small in width fluctuation and bending and has an excellent sectional shape by subjecting only the rear end to edging in the final several passes by edgers provided on the front and rear of a reversible horizontal rolling mill. CONSTITUTION:Edgers having edger rolls E1, E2 are disposed on the front and rear of horizontal rolls H of a reversible horizontal rolling mill. A steel plate material is moved back and forth and is rolled down by the rolls H to reduce the thickness. Said material is reduced down transversely by the edger rolls E1, E2. After such stage is executed for about 8 passes back and forth, only the rear end 4 of the plate material corresponding to the distance between the rolls H and the roll E1 is subjected to edging by the roll E1 in the 9th pass and only the rear end 5' is subjected to required edging in the same way in the succeeding final 10th pass.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for rolling a plate material, such as a thick steel plate.
The present invention relates to a rolling method for obtaining a regular product with a small can, a cross section of 7E, and a sheath shape of 11.

In rolling plate materials, it is important to obtain a product with a uniform width in the longitudinal direction, no upward slope (camper), and a rectangular cross-sectional shape at the edge of the width, in order to ensure the quality of the steel plate and improve yield. extremely important.

(Prior art) Generally, when edgers are used to edge the width edges of a plate with the rolls partially opened, the front and rear edges of the plate are less constrained in the longitudinal direction than the center, resulting in a reduction in the width direction. Despite this, it is pushed out in the longitudinal direction, resulting in a width drop (narrowing of the width) as shown in Figure 1, resulting in a fishtail shape, and the rolling blade in the width direction does not cover the entire width of the board. Therefore, the cross section in the width direction has a dogbone shape as shown in FIG. This is the board thickness. When this plate material is subjected to flat rolling using horizontal rolls following edge rolling, the fishtail shape is enlarged and, at the same time, width reversal (a dog bone partially appears in the width direction) occurs in the center of the plate material. This results in a planar shape as shown in FIG.

t is the length of the plate material.

In this way, plate materials subjected to edge rolling and flat rolling have large width fluctuations in the longitudinal direction, resulting in a significant decrease in yield.

To solve this problem, many types of edging compression have been developed. For example, in the technique disclosed in Japanese Patent Application Laid-Open No. 56-50726, the amount of reduction in the cutting reduction is made substantially zero at both the front and rear ends of the plate material where the width drop occurs, and the etching is applied only to the central part. However, if the edger roll is not driven, the leading edge of the plate must be bitten by the horizontal rolling roll before etching is applied, so the distance between the horizontal roll and the edger roll is There is a portion at the rear end of the long plate that is not etched, and therefore the width fluctuation behavior is different, so even if this technique is applied as is, it cannot be expected to improve the width accuracy in the longitudinal direction.

The front end and the rear end are always the front end with respect to the traveling direction of the board (since the board is rolled with a reversible horizontal roll mill, the board is moved back and forth, and the direction of travel of the board is reversed every pass). side (front end), rear side (rear end), leading edge,
The length from the trailing edge corresponds to the distance between the edger and the horizontal roll mill.

Further, Japanese Patent Application No. 58-88993 discloses a technique for using a non-drive type edger. According to this, the next ξ
At the front end of the plate material (the rear end of each step), which is subjected to strong etching in the pass, an extra edge reduction is applied in consideration of the amount of etching in the next pass and the amount of width return during horizontal roll rolling. It is said that it will add However, when the leading edge of the plate material is subjected to etching reduction after being bitten by the horizontal rolling rolls, the inventors have found that the central part of the plate material is not etched in each pass. On the other hand, because the front and rear edges are only etched once every 2 steps, and because tension is applied to the center of the board, the center of the board is edged as shown by the solid line in Fig. 8(a). Width (1
400ms) is smaller than the width at both ends (1410m), so the width accuracy does not improve at all, and the process of determining the timing and amount of edging is very difficult because the amount of edging reduction must be changed midway through the pass. The problem was that it was cumbersome, bulky, and lacked practicality.

(Objective of the Invention) The present invention solves the above-mentioned problems in the prior art in rolling root blades using a reversible horizontal roll rolling mill and roll non-driving edgers disposed on the front and rear surfaces thereof. However, the object of this invention was to provide a rolling method for producing rolled products with extremely small width fluctuations in the longitudinal direction of the plate side, no cans, and excellent cross-sectional shapes.

(Tank Bottom of the Invention) The features of the present invention include the process of applying pressure to a metal plate material to reduce its thickness by a reversible horizontal roll rolling machine, and the front surface of the reversible horizontal roll rolling machine. In the rolling process of a plate material, which includes the process of applying reduction in the width direction of the plate material by an edger installed on the rear surface, the reversible horizontal roll rolling machine and the edger are The method of etching a plate material is such that only the rear end portion in the longitudinal direction of the plate material corresponding to the distance between -f and % is etched.

The present invention will be explained in detail below.

The inventors discovered that when rolling a plate using a non-roll drive type edger, in the prior art described above,
As a result of examining the causes of uneven width in the longitudinal direction of the plate material as shown by the solid line in FIG. When the plate material is reduced by the edger of this method, the widthwise reduction by the edger is only performed after the plate material is bitten by the rolling rolls of the horizontal roll mill and force (thrust) in the longitudinal direction is applied to the plate material. In rolling under such conditions, in the conventional technology, the amount of etching to be applied in the next pass with the relevant nog to the front end of the plate material to which no etching is applied in the next pass, Etching is added in anticipation of the amount of width return during rolling by horizontal rolls.Etching is added once every two passes, and the edge is only etched by the thrust applied to the plate material by the horizontal roll mill. As a result of the fact that a strong tension acts on the plate material between the horizontal roll and the edger, especially in the longitudinal center of the plate material, the plate material after rolling has the following properties:
It exhibits a planar shape (width dimension in the length direction is uneven) as shown by the solid line in FIG. 8(a).

Therefore, the inventor constructed a plate rolling process using a reversible horizontal roll rolling mill and roller non-driving type edgers arranged on the front and rear surfaces thereof as follows. That is, except for the 2 to 3 no. After rolling, the process of applying thickness direction reduction using horizontal rolls is repeated to advance rolling.
After reaching the stage near the edge, the edger roll was edged only at the rear end in the longitudinal direction of the plate, which corresponded to the distance between the horizontal roll mill and the edger. Rolling proceeds by applying a reduction in the thickness direction of the plate material.

By configuring the rolling process in this manner, it is possible to obtain the planar shape of the EE rolled product shown by the dotted line in FIG. 8(b).

Further, the cross-sectional shape of the rolled product is also excellent, with the side edges exhibiting a rectangular shape, as shown in FIG.

As described above, the present invention provides an endless rolling process for plate materials using a non-roll driven edger, in which the width of both lengthwise ends of the plate material where no etching is applied in the width direction, that is, the width of the unrolled belt in the width direction, is In order to correct it at the stage including the problem,
This is based on the knowledge that adding edging is effective for uniformity of the width of rolled products, absence of curvature, and excellent shape of side edges in cross section.

〔Example〕

The present invention will be explained in more detail below based on examples.

As shown in FIG. 7, after setting the roll gap of the horizontal rolling roll 11, the edger roll E p bl on the front ridge surface of the horizontal rolling roll 11 is set.
: E2, E2 The opening degree of each roll is set to a sufficiently open state, and the leading edge J of the plate material S is bitten into the horizontal rolling roll by a table roller (not shown). When the plate material is bitten by the horizontal roll, the rolling load is detected, and upon receiving the start-up signal, the edger roll E1. El
The roll opening degree is set to a predetermined value of 1, and the pressure IA of the first pass is performed without applying edging using the pulling force during horizontal roll rolling.

When the first pass of rolling is completed, the edger roll ■h is applied.

El; Open the rolls of E2 and E2 sufficiently and place the leading edge 3' of the bedding S (corresponding to the trailing edge 3 of the first pass) on a table roller (not shown) into the 2nd ξth roll gap. The leading edge of the plate material is bitten by the horizontal roll H that has been set. When the leading edge of the plate material is bitten by the horizontal roll, the roll opening degree of the edger roll B2 is set to a predetermined value using the rising signal of the rolling load at that time. 2 while setting to t2 and applying etching.
Perform rolling with cross-cuts.

The width variation state in the longitudinal direction of the plate material after 8 grooves when the etching rolling and the flat rolling using the horizontal rolls are repeated in this manner is shown by the line in FIG. 8(a). This figure shows the actual results using the rolls shown in Table 1 and the reduction schedule shown in Table 2.The width of the front and rear ends of the board is slightly wider than that of the center part of the board. The length of the wide part is the distance between the horizontal roll and edger roll in Table 1.
It corresponds to L+ (L2).

Therefore, in the 9th ξth rolling step before the final pass, the edger rolls IJ, IJ:B2 are used as shown in FIG.
, The leading edge J of the plate material S by adjusting the roll opening degree of B2 sufficiently.
is caught in the horizontal roll, and from the time when the plate material is caught in the horizontal roll (distance between horizontal roll and edger roll L *
) / After the time set by (rolling speed υ) has elapsed, the roll opening degree of the edger rolls EI and El is set to a value such that the amount of edging at the center of the temporary phase becomes substantially zero, and rolling is started. Proceed. As a result, the wide rear end portion 4 of the plate material is compressed and becomes the same width as the central portion.

The front end 5 remains wide. When the ninth pass of rolling is completed, the edger roll E1. Ei: B2. A horizontal rolling roll with a sufficient roll opening of B2 was set so that the leading edge 3' (corresponding to the trailing edge 3 of the plate material S) of the plate material S was set at the roll gap of the 10th pass, which is the final pass. Let it bite.

When the plate material is bitten by the horizontal roll, from that point on, the edger roll E is delayed by the time determined by (distance L2 between horizontal roll and edger roll) / (rolling speed υ).
Rolling is proceeded by setting the roll opening degree 22 of 2+B2 to a value that makes the amount of etching at the center of the plate material substantially zero. As a result, the width of the wide rear end portion 5' of the plate material (corresponding to the front end portion 5 of the front pass) is corrected.

Figure 8 (
As shown by the dotted line in b), the width variation is extremely small.

(Effects of the Invention) When etching is carried out according to the method of the present invention, the longitudinal width fluctuations seen in the conventional method are significantly reduced by simply controlling the opening of the edger roll.

Furthermore, the camper C shown in Fig. 4 can be made smaller by the action of tension, and the amount of swell t at the width end of the plate material as shown in Fig. 5 can be reduced to a smaller size as shown in Fig. 6. Since it can be expected to be formed into a rectangular cross-sectional shape, high-quality plate materials can be manufactured at a high yield.

[Brief explanation of drawings]

Figure 1 is a diagram showing a fishtail caused by edge rolling, Figure 2 is a diagram showing a dogzine caused by edge rolling,
Figure 3 is a diagram showing the planar shape when edging 8E rolling and flat rolling are repeated, Figure 4 is a diagram showing that bending (camper) will occur if etching is not applied, and Figure 5 is a diagram showing that curvature (camper) will occur if etching is not applied. Fig. 6 shows the ideal cross-sectional shape, Fig. 7 shows the rolling state at the initial rolling stage, and Fig. 8 shows the longitudinal width change after 8 passes and after the final pass. FIG. 9 is a diagram showing the rolling state at the final pass stage. Explanation of symbols b...Plate width, C...Camper amount, h...Plate thickness, t...Malling amount, t...Plate length, S
...Plate material, H...Horizontal roll% El t B2・
... Etsiya roll! iI! + '2... Roll opening degree of edger roll, ■... Leading edge of odd numbered passes, 1'... Trailing edge of even numbered passes, 3... Trailing edge of odd numbered passes, 3 ′...Top edge of even number ξ, 4.5′...
- Rear end, 5... Front end agent Masaaki Akisawa Patent attorney Mitsugai 2 Nai 1 Figure f 2 Figure 71' 3 Figure Yoshi 4 Figure Yoshi 5 Figure 71' 6 [D O 6 Figure

Claims (1)

[Claims] (1) The reversible horizontal roll mill applies pressure to the metal plate to reduce its thickness, and the edgers installed on the front and rear surfaces of the reversible horizontal roll mill reduce the thickness of the metal plate. In the rolling process of a plate material including the process of applying reduction in the width direction, in 2 to 3 passes including the final roll ξ, the longitudinal edge of the plate material corresponding to the distance between the reversible horizontal roll rolling mill and the edger. A method for etching a plate material, characterized by applying etching only to the ends.