JPH04172114A - Device and method for edger mill rolling of wide flange shape - Google Patents

Abstract

PURPOSE:To surely keep the accuracy of dimension and to reduce the number of possessive rolls by having plural sets of the caliber of the bilateral symmetry, the same diameter of caliber collar and the different bottom diameter of caliber, and making changeable the roll position which is divided into two in right and left. CONSTITUTION:The roll of edger mill is composed of two divided sleeve rolls 40 fit in an arbor 41. This right and left sleeves 42, 42 can be moved equal in right and left to the center of the direction of roll shaft by driving a motor set at a roll end of the working side. The calibers 44 over than two pieces are grooved in the bilateral symmetry on the right and left sleeves 42, 42. The roll outer diameter Do of both sides of the caliber 44, that is, the collar diameter of the caliber are made equal. The eccentricity of web center can be improved by drafting the web of wide flange shape light at the part of inner side equivalent to the web, because the outer diameters of the rolls are equal. Therefore, the accuracy of dimension is surely kept, the roll change that many sizes are surely kept and the roll change of the rolling at the same position with many sizes and the roll possessive number can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus and method for hot rolling H-section steel used in civil engineering and construction, particularly to an edger mill rolling apparatus and method.

(Prior Art) Figures 1 (^), (B), and (C) show a conventional method for rolling H-beam steel. The raw H-shaped steel IO is subjected to universal rough mill rolling (υR) in Figure 1 (^) to reduce the thickness of the web and flange, and then edger mill rolling (E) in Figure 1 (B) to reduce the thickness of the flange. A width reduction is performed and then finished by a universal finishing mill (UP) as shown in FIG. 1(C).

Here, the roll of the edge mill shown in FIG. By size (e.g. H600X 200. H600X 225.11
600 x 250, . . .) requires a special roll or hole mold, and when changing the size, it was common knowledge to replace the roll of the edger mill. In order to ensure dimensional accuracy, during edge mill rolling, the rolled material and the roll come into contact at the roll inner width a and inner depth b.
This is because it is necessary to keep the positional relationship between the roll hole shape and the rolled material constant.

In other words, as shown in FIG. 2(A), when H-shaped 810 is rolled with an edger roll (E) having a shallow inner depth b,
It becomes difficult to maintain the web 22 in the center with respect to the flange 20 as shown in FIG. 2(B), and the center of the web 22 tends to shift. This becomes a big problem when strict dimensional accuracy equivalent to that of welded H-section steel is required, such as constant outer diameter II section steel.

Therefore, special edger rolls or grooves are provided for each size, and the rolls are changed depending on the size. Therefore, it is necessary to change the rolls nearly 100 times a month, causing problems such as a decrease in mill operation rate and an increase in the number of rolls in stock.

This should be solved (in Japanese Patent Application Laid-open No. 63-72413,
Using a caliberless roll 30 as shown in FIG.
Edger rolls (E) have been proposed that can be used for all sizes by changing the roll opening degree.

However, as is clear from Figure 3, with this edger roll, it is difficult to maintain a constant positional relationship between the roll and the material within the edger roll rolling tool, and the web is forced to move to the center of the flange. This is extremely disadvantageous for improving web-centric bias.

(Problem B to be solved by the invention) In other words, the problems of the prior art can be summarized as follows.

■In order to ensure sufficient dimensional accuracy of the H-shaped steel, a special roll hole type is required, and therefore it is necessary to change the blank rolls. This causes problems such as a decrease in mill operation rate and an increase in the number of rolls held.

■If you use a general-purpose roll, you can solve the problem of a decrease in mill operation rate and an increase in the number of rolls in stock, but it is difficult to maintain the dimensional accuracy that is conventional, and it is not suitable for materials with strict dimensional accuracy such as H-shaped steel with constant outer diameter. Difficult to apply.

The object of the present invention is to provide an edger mill that maintains the same level of dimensional accuracy as conventional methods and rolls multiple sizes with the same roll, thereby eliminating the problem of a decrease in mill operation rate and an increase in the number of rolls owned. It is to provide rolling equipment and rolling method.

(Means for Solving the Problems) In order to achieve the above object, the present inventor has conducted intensive research and found that multiple sets of hole molds are symmetrical and have the same hole collar diameter and different hole bottom diameters. The present inventors have discovered that by adopting a two-part type roll having the following properties in an edger mill, it can be used as a roll for a plurality of sizes, and have completed the present invention.

That is, the present invention provides an H-shaped steel edge that is bilaterally symmetrical, has a plurality of sets of holes with the same hole collar diameter, and different hole bottom diameters, and can change the position of the left and right rolls divided into two. It is a ten-mill rolling mill.

From another aspect, the present invention is applicable to a rough universal rolling process consisting of a 1m or multiple sets of universal mills and two old edge mills, and an edger mill rolling process that is divided into left and right halves and has a freely movable edger roll. On the occasion of
It has multiple sets of grooves that are bilaterally symmetrical and have the same groove collar diameter and different groove bottom diameters, and each time the rolling size is changed, the left and right roll positions are changed, and a groove dedicated to each rolling size is used. This is an edger mill rolling method for H-beam steel.

As described above, according to the present invention, the edger roll is divided into two parts, and a plurality of holes are carved symmetrically in the left and right directions. This hole type is suitable for each dedicated size, and the outer diameters of the rolls on the outside and inside of the hole are all the same, and only the hole bottom diameter is a different value, that is, it corresponds to the inner dimension of each dedicated size. It is.

After rolling an H-section steel of the size formed by the edger rolls constructed in this manner, the left and right rolls are moved to set another hole shape at the rolling position. Also, use the same method for the next size.

As described above, according to the present invention, especially when the web height is the same and the flange widths are different, it is possible to roll several sizes on the entire line without changing rolls. Note that if the flange widths are the same but the web heights are different, it will be necessary to change the rolls of the universal mill, and the effect of reducing the number of roll changes will be small.

In general, in an edger mill, the unfilled flange is detected beforehand, so the motor power of the edger mill is small.If the edger roll is made into a groove and filled with material, the mill power will be insufficient, so the present invention Also, the outer surface of the flange is kept from contacting the roll.

(effect) The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in FIG. 4, an example of which is shown in a schematic cross-sectional view, the roll of the edger mill according to the present invention consists of a two-part sleeve roll 40 fitted into an arbor 41, and a sleeve roll 40 attached to the work side roll end. By rotating a motor (not shown), the left and right sleeves 42, 42 can be equally moved left and right with respect to the center in the roll axis direction. Two or more holes 44 are symmetrically carved in the left and right sleeves 42,42.

As shown in FIGS. 5(A) to (0), this hole pattern 44 corresponds to the conventional size-based edger hole pattern,
The roll outer diameter DO1 on both sides of the groove 44, that is, the diameter of the groove collar, are all equal. Since the outer diameters of the rolls are equal in this manner, the web of the H-beam steel can be lightly rolled down in the inner web-corresponding portion, and the web center deviation can be improved.

In other words, if the diameter of the roll corresponding to the inner web is different for each groove type, when a certain groove type is used, it becomes impossible to lightly reduce the web, and the effect of improving the web center deviation is lost.

As partially enlarged in FIGS. 5(B), (C), and (D), the corresponding conventional type edger roll hole depth (
dl, dl, d,...) are different, and are used depending on the target flange height.

The situation at this time is similarly shown in a schematic cross-sectional view in FIG.

For the H-section steel 10, an appropriate combination of hole shapes is selected depending on the target flange height, and the web width is determined by moving symmetrical rolls in the axial direction.

The flange should not fill the hole.

Next, a rolling operation using the edger mill rolling apparatus according to the present invention will be explained.

FIG. 7 shows an example of a rolling line for edge rolling according to the present invention.
The rolled sample material roughly formed in step D) is then passed through a universal rough rolling mill (OR) and an edger rolling mill (E) to form a constant outer diameter H-section steel, and then passed through a universal finishing mill (OR).
Finished by UP).

According to the present invention, as shown in the above-mentioned FIG. 6, one size of H-section steel is rolled using one hole pair, but when the size changes, rolling is performed as follows.

First, considering that there are groove patterns for each month, A and BSC, as shown in Figure 8, for example, when rolling of a certain size using groove C is completed, only the edger mill moves the left and right rolls. , the next hole pattern B is set at the position of the previous hole pattern C. In this case, the rolled size has the same web height and different flange width, such as H60.
0x 200. H600x225, H600x25
0.11600 x 275, H600x 300, etc.

However, as mentioned above, it is difficult to form flanges of multiple sizes from the same beam blank using only an edger mill due to the mill power. Modeling is necessary.

However, if the difference in flange width is about 25 ig, it is sufficient to change the flange width by edge mill rolling alone.

In rolling with the tlR mill group for each size, the edger dedicated to each size is
Edger rolling is performed for all passes of the υR mill in the groove, and there is no need to change the edger groove between passes.

Furthermore, when rolling different sizes of webs with the same flange width and different web heights using the same hole type, the edger mill is used with the same hole type and the spacing changed for each size. In this case, it is necessary to change the rolls of at least the universal rough forming mill. In other words, H600X 200, H650X200, H
This is a case where a size such as 700 x 200 is rolled using the same edge medium roll.

(Example) Next, the present invention will be explained in more detail with reference to Examples.

In this example, the present invention was implemented using the mill layout shown in FIG.

In the figure, the device according to the present invention was applied to the edge mill. Also, in the universal finishing mill, the width of the horizontal roll is variable, making it possible to adjust the web height within a range of several thousand meters.

Figure 8 shows H700X200.1 (700X225, H
Edger for rolling H-section steel of various dimensions of 700x250
The diameter of the left and right rolls of each hole type is 1300 mm in diameter, and the depth of hole types A, B, and C provided symmetrically on the sleeve roll 42 is 94 m5.106
．． 5 gm, 119 ms+, each with a taber of 5°. The maximum flange thickness for these three sizes is 2
8 mm, the horizontal roll width of the universal roughing mill (OR) was set to 644 mm.

First, when rolling an 8700 x 250 H-section steel, the outermost hole type C was used. At this time, the left and right rolls were in contact. At this time, the inner spacing of hole C is 644■
- Next, when rolling H700X 225 H-beam steel,
The left and right rolls of the edger were each moved outward by 140 mm, and the inner spacing of hole B was set to be 644 m.

Further, when rolling of 8,700 x 200 H-beams was started, each of them moved 140 mm to the outside, and the inner spacing of hole A was set to 644 am. This left and right 14
0an total time required to travel 280 m+* is approximately 50
It was seconds.

The number of passes of the UR mill group in each hole type was 13 passes. In this case, the shape of the beam blank supplied from the B[I mill was changed only in the flange width. In other words, the flange radius was changed in the final pass of the BD mill.

Then 11600 x 200, 1650 x 20
0.1 (700 x 200 H-section steels are rolled with the same edge roll. The tlR of each size is
OR mill flat roll width is 550mm, 600mm, 65
It was 0su+.

First, in the case of a 1600 x 200 H section steel, the distance between the left and right rolls was 426 m, and the hole type was all hole type A. When rolling a H 650 x 200 H section steel, The roll is 25m5+ on the left and right sides.
The roll spacing was 476 gin, and the inner spacing of hole A was 600-1. Furthermore, in the case of H700x200, rolling was performed with the inner interval of the hole A, in which the left and right rolls were moved by 25 mm, set to 650 mm. In this case, as mentioned above, the horizontal rolls of the OR mill had different widths, so it was necessary to change the rolls. However, with the Edger roll, there was no need to change the rolls, and it was possible to reduce the number of rolls owned.

(Effects of the Invention) As described above, according to the present invention, by changing the gap between the left and right rolls of the same roll and selecting edger rolls for different sizes, it is possible to ensure the same dimensional accuracy as before and to handle multiple sizes. It is possible to reduce the number of roll changes and the number of rolls owned in the same rolling process, which will greatly benefit the industry.

[Brief explanation of drawings]

Figures 1 (^), (B), and (C) are explanatory diagrams of the rolling of H-beam steel by conventional universal roughing mills, edger mills, and universal finishing mills; Figures 2 (^), ( B) is an explanatory diagram of the rolling situation by an edger mill when the inner diameter depth is insufficient; FIG. 3 is a schematic explanatory diagram of another known technique example; FIG. A schematic explanatory diagram of the cross-sectional shape of the mill roll; Figures 5 (^) to (D) are explanatory diagrams showing the correspondence between the roll of the Edger mill according to the present invention and the roll of a conventional Edger mill; Figure 6 is , a schematic explanatory diagram of the web rolling situation during edger rolling according to the present invention; FIG. 7 is a schematic explanatory diagram of the mill layout for carrying out the rolling method according to the present invention; and FIG. 8 is a schematic explanatory diagram of the roll hole in the example. It is an explanatory diagram of a model example. 40: Two-part sleeve roll 41: Taber 42: Sleeve 44: Hole Oo: Roll outer diameter (hole collar diameter) dl+ dl d,...: Hole depth

Claims (2)

[Claims] (1) Edger mill rolling equipment for H-beam steel that is bilaterally symmetrical, has multiple sets of holes with the same hole collar diameter and different hole bottom diameters, and is capable of changing the position of the left and right rolls divided into two. (2) In the rough universal rolling process consisting of one or more sets of universal mills and 2Hi edger mills, during rolling with an edger mill that is divided into left and right halves and has a freely movable edger roll, the diameter of the hole collar is symmetrical and An H-beam steel characterized by having multiple sets of holes with the same diameter but different hole bottom diameters, changing the position of the left and right rolls each time the rolling size is changed, and using a hole exclusively for each rolling size. Edger mill rolling method.