JPH06328101A - Device line and method for rolling shapes having flange - Google Patents

Abstract

PURPOSE:To provide a rolling method for adjusting excess metal having the amount of excess metal corresponding to the amount of widening, method and device line for widening a web with which necking is reduced as a method for freely separately manufacturing the web height of shapes having flanges especially a wide flange shape. CONSTITUTION:An intermediate universal mill RU in which notched parts having the area of necessary and minimum excess metal that is determined from the target amount of widening of the web height and web thickness of a product are provided and an oblique roll type rolling mill SS1 are used. In the case of not executing widening, the excess metal which is formed by each rolling pass in the RU is rolled down and vanished with the SS1 the oblique angle of roll of which is made zero degree. In the case of executing the maximum widening, after forming the excess metal with the RU without using the SS1, the widening of a 1st stage is executed with the SS1 whose rolls are set in prescribed positions. In the case of intermediate widening, after adjustment rolling to a prescribed cross-sectional area of excess metal with the RU and SS1, the widening of the 1st stage is executed with the SS1 whose rolls are set in the prescribed positions. And, by moving the vertical rolls of the RU on the outlet side of rolling or on the inlet side of rolling, the adjustment of metal flow from flange to the web is jointly used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus train for a profile having a flange, that is, an H-section steel, a channel shape and similar, metal or non-metal profiles, and a rolling method using the rolling train. In particular, the present invention relates to a rolling apparatus train and a rolling method for efficiently and freely forming the height of a H-section steel web without any shape defect.

[0002]

2. Description of the Related Art Currently, the profile materials manufactured by rolling are
There are various types, cross-sectional shapes and dimensions,
The feature is that the number of sizes is very large. Along with the diversification of demand needs, there is an increasing tendency toward more products and sizes. In order to manufacture these multi-product, multi-size profiles, conventional rolling equipment and methods use rolling rolls and guides that are used from rough rolling to finish rolling according to the product type and size of the profile. Must, in principle, be prepared exclusively. In addition, the number of times the rolls and guides are replaced is large, and the loss of the replacement time is large. Therefore, in order to satisfy the needs of customers such as diversification of product sizes and expansion of manufacturing range, the cost becomes high and it cannot be easily handled.

As a concrete example of this, the case of H-section steel will be described below. FIG. 9 (a) shows a typical example of a conventional H-shaped steel rolling equipment train, but one breakdown rolling mill 1 (BD) and then a four-roll universal rolling mill (RU). It is composed of a single or plural RU-E group 2 composed of an edger rolling mill (E) and a 4-roll universal rolling mill 3 (FU) for finishing.

FIG. 9 (b) shows the respective shapes 4, of the rolled material formed by the rolling mills 1, 2, 3 in FIG. 9 (a).
5 and 6 are shown. FIG. 10 shows the relationship between the rolling roll of the universal rolling method for rolling H-section steel and the rolled material to be rolled. Due to the function of the universal rolling mill, it is possible to freely change it with the same set of roll pairs during rolling. The only dimensions that can be obtained are the gap 9 between the upper horizontal roll 7 and the lower horizontal roll 8 and the gaps 12 and 13 between the left and right vertical rolls 10 and 11 and the upper horizontal roll 7 and the lower horizontal roll 8. Therefore, the inner width IW of the H-section steel web must be constant. As a result, when rolling a series having different web thickness 9 of H-section steel products, if the left and right flange thicknesses 12 and 13 are changed, naturally the web inner width IW and the left and right flange thicknesses 12 and 13 are combined to obtain the web height OW. Will have to change to various dimensions.

That is, in the H-section steel rolled by the conventional rolling method, the web inner width IW is constant as shown in FIG. 11, and the flange height Tf1 changes to Tf2, so that the web height changes from OW1 to OW2. It will be a changing product series with a constant web width.

If an H-shaped steel product series having a constant web height is manufactured by a conventional rolling method using a universal rolling machine, all of rough rolling, intermediate rolling and finish rolling are performed depending on the change of the inner width of the web. Since most of the upper and lower horizontal rolls in the process are prepared, a large number of rolls are required, and the rolls have to be frequently recombined, which results in a significant increase in manufacturing cost. It is impossible to do.

Further, even in the case of the conventional H-section steel, when it is attempted to manufacture product series of other sizes having different web inner widths by the conventional rolling method using the universal rolling machine, the rough rolling is performed in accordance with the change of the web inner width. Since most of the upper and lower horizontal rolls in all the processes of intermediate rolling and finish rolling are prepared, a large number of rolls are required.

The applicant of the present application has previously proposed "a method of rolling a profile having a flange" (Japanese Patent Publication No. 3-42122) as one method for solving the drawbacks of the conventional method. This "skew roll type rolling method" is characterized in that, as shown in FIGS. 6 (a) and 6 (b), the upper and lower two skew rolls 15, 15 'and 16, 16' are the outer side surfaces 19, 19 '. , 20 and 20 'are set to the left and right roll intervals L so as to be in contact with the flange inner sides 21 and 22 of the rolled material 17, and the roll axis S is θH with respect to a plane perpendicular to the rolling direction in a plane horizontal to the rolling direction. Further, in the plane perpendicular to the rolling direction, while maintaining the angle of θV with respect to the plane horizontal to the rolling direction, the extra thickness portion 18 formed thicker than the central portion of the web in the previous step is pressed down to reduce the rolling. It has the function of causing the material in the closed portion to flow in the width direction and expanding the web in the width direction without causing any web waves. Here, the roll interval L is the distance from the intersection Z of the skew roll axis shown in the plan view (a) to the point O or O ′ on the skew roll outer surface.

FIG. 7 (a) shows an example in which the rolling mill 14 adopting the "oblique roll rolling method" is incorporated in a hot rolling equipment train for H-section steel. Intermediate universal rolling mill (RU-E) 2 and skew roll type rolling mill (SS) 14 in the figure
By combining a finishing mill (FU) 3 with a variable horizontal width of the horizontal roll, the "H-shaped steel product series with constant web height (OW)" in Fig. (C), which is the above-mentioned typical need, is provided. It is basically possible to manufacture with a small number of rolls.

Further, referring to FIGS. 7A and 7B, an example in which the oblique roll method is applied to the manufacture of the H-section steel product series having a constant web height (OW) will be described in detail.

First, the intermediate universal rolling mill group 2 (RU
In (E), the beam blank 4 supplied from the rough rolling mill 1 (BD) is shaped up to the cross-sectional shape 25 having the extra thickness portions 18 at both ends of the web. That is, notch parts are provided on the left and right circumferential surfaces of the upper and lower horizontal rolls of the intermediate universal rolling mill (RU), and the notch parts are rolled so as to fill the steel material, and a cross sectional shape 25 is formed. The number of types of the cross-sectional shapes 25 molded in this way is not limited. That is, since the material is rolled and shaped by the universal rolling mill in the intermediate process, the web thickness and the flange thickness can be freely changed, and the required number of different cross-sectional shapes can be shaped according to the product series. . The web inner width IW1 is constant, and the web height OW1 is not necessarily constant. The cross-sectional shape 25 formed by the intermediate universal rolling mill group 2 or a rolling material formed into a cross-sectional shape in which the web thickness and the flange thickness are further different as necessary is sent to the skew roll type rolling mill 14 (SS). The cross-sectional shape 2 is obtained by widening and rolling each of these rolling materials into various web internal width dimensions IW2 required according to the product series by the skew roll type rolling mill 14 (SS).
It becomes 7.

The cross-sectional shapes 27 produced by the oblique roll type rolling mill 14 (SS) are different from each other in the inner web width according to the product series by the finish rolling mill 3 (FU) in which the body width of the horizontal roll is variable. The product 29 is shaped and rolled into a sectional shape 28 having IW4 and has a constant web height OW and has IW6 according to the product series. Further, in the product series, the product 31 having the largest flange thickness and the smallest inner web width is subjected to the finish rolling in which the horizontal width of the horizontal roll is variable without performing the web widening by the skew roll rolling mill 14 (SS). It is possible to manufacture by directly using the cross-sectional shape 25 of the intermediate universal rolling mill group 2 in the rolling mill 3 (FU). However, in this case, the web inner width IW3 of the sectional shape 30 corresponding to the product web inner width IW5 and the web inner width IW1 of the sectional shape 25 of the intermediate universal rolling mill group 2 are formed.
And are set to mutually compatible values.

Further, the applicant of the present application has already proposed "rolling equipment for a profile having a flange" (Japanese Patent Laid-Open No. 63-56302). As shown in FIG. 12, the rolling facility is characterized in that two oblique roll type rolling mills 104 and 105 are arranged in tandem between an intermediate rolling mill 103 and a finishing rolling mill 106. The aim is to obtain a larger web width compared to the case where only one skew roll rolling mill is used.

Further, as a structure of the oblique roll type rolling mill, the applicant of the present invention has adopted "a profile rolling facility having a flange".
(Publication of Japanese Patent Laid-Open No. 61-172605) and "Shape forming device" (Publication of Japanese Patent Laid-Open No. 4-46616) are proposed.

As described above, the oblique roll type rolling method disclosed in Japanese Patent Publication No. 3-42122 and Japanese Patent Laid-Open No. 63-5630.
By using the oblique roll type rolling equipment of Japanese Patent Publication No. 2 publication, a good web widening function can be obtained. However, in order to manufacture products of different series from the same set of rolls, when a large web widening is attempted, (a) the corner R portion 41 and the boundary 43 between the extra thickness portion and the central portion 42 as shown in FIG. Local thickness reduction (hereinafter,
A large amount of extra thickness is required in order to prevent the occurrence of "constriction". (B) Since the amount of surplus is the same for each size of the profile, when the web height is not widened, a very large surplus must be reduced by the finishing mill. (C) It is necessary for the finishing rolling mill to have a structure in which the body width of the horizontal rolls is variable in response to changes in the web width of the profile, and if the rigidity and strength of the rolls are lower than those of conventional integrated rolls. I have no choice. For the above three reasons, there arises a problem that the surplus remains in the product web.

As a method for solving this problem, the applicant of the present invention has disclosed that "a method of rolling a profile having a flange" (Japanese Patent Laid-Open No. 6-58242)
3-72402). As shown in FIG. 15, the feature of this rolling method is that the intermediate rolling mill 102 shown in FIG. 14 preliminarily prepares a surplus amount when the widening amount is large and a small surplus amount when the widening amount is small. Add meat and adjust the amount of surplus by the finishing rolling mill 106,
This is to perform the oblique roll rolling of the excess thickness portion by the oblique roll type rolling mill 142 so that it becomes equal to the thickness of the unrolled portion of the web.

When this rolling method is used, when the control range of the widening amount is relatively narrow, it is possible to obtain a surplus amount corresponding to the widening amount. However, in order to manufacture products of different series from the same set of rolls, when it is attempted to adjust the amount of surplus from a large widening to a zero widening, the rolling material is reciprocally rolled by the intermediate rolling mill 102 to a constant (large amount). ) After finishing to an intermediate shape having a surplus amount, a finishing rolling mill 106
In one pass or in multiple passes, the finishing rolling mill 1 is used to reduce the required minimum surplus amount according to a predetermined widening amount.
The amount of excess thickness reduction in 06 is large, and excessive rolling reaction force occurs in order to eliminate excess thickness in one pass. Also, if excess thickness is reduced in multiple passes, rolling pass time increases and productivity decreases. If the excess thickness is reduced only by normal horizontal rolls that are not pressed by vertical rolls, the excess thickness will flow in the width direction as the excess thickness decreases and the inner width of the web will decrease. However, if the roll with a constant horizontal roll length is used, it is not possible to effectively reduce the excess thickness portion even if it is attempted to reduce the excess thickness portion in multiple passes. Also, if the excess thickness portion is reduced in one pass, the shaping rolling mill 113 There are some problems to be solved in that widening of a size that cannot be narrowed occurs.

[0018]

SUMMARY OF THE INVENTION According to the present invention, in order to manufacture products of different series from the same set of rolls without causing the above problems, the final web widening is performed by the oblique roll type rolling mill. An object of the present invention is to provide a rolling apparatus train and a rolling method for adjusting the amount of excess thickness in the rolling step before performing the rolling.

[0019]

The gist of the present application lies in the rolling apparatus train and rolling method described below.

That is, as the device array, 1. In the rolling apparatus row of the profile, in which the oblique roll type rolling mill is arranged between the intermediate rolling process and the finish rolling process of the profile rolling process including the rough rolling process, the intermediate rolling process, and the finish rolling process, At least one-fourth of the minimum required surplus area calculated from the target width expansion amount of the web height and the product web thickness on each of the left and right peripheral surfaces of the upper and lower horizontal rolls of at least one or more universal rolling mills in the rolling process.
And a notch having a cross-sectional area corresponding to, and a skew rolling mill is separately provided near the rear surface of the universal rolling mill.

2. Of the intermediate rolling process of the rolling mill train,
A rolling mill train for a profile having a flange, characterized in that at least one or more universal rolling mills have a vertical roll having a mechanism for changing a position to a rolling-out side or a rolling-in side.

The rolling method is as follows: An oblique roll type rolling mill is arranged between the intermediate rolling process and the finish rolling process of the profile rolling process consisting of the rough rolling process, the intermediate rolling process and the finish rolling process to increase the web height of the profile. In the rolling method of the profile to be performed, the required minimum surplus obtained from the target expansion amount of the web height and the product web thickness on each of the left and right peripheral surfaces of the upper and lower horizontal rolls of at least one or more universal rolling mills in the intermediate rolling step. A notch having a cross-sectional area corresponding to at least 1/4 of the meat area is provided, and is provided separately in proximity to the rear surface of the universal rolling mill for each rolling pass for forming a surplus at both ends of the web of the profile. A method for rolling a profile having a flange, characterized in that the thickness of the excess thickness portion is reduced by an oblique roll type rolling mill so as to be equal to the thickness of the central portion of the web.

4. At least 1/4 of the minimum required surplus area obtained from the target width expansion amount of the web height and the product web thickness on each of the left and right peripheral surfaces of the upper and lower horizontal rolls of at least one universal rolling machine in the intermediate rolling process. A cutout portion having a corresponding cross-sectional area is provided, and a surplus portion that fills the cutout portion is formed at both end portions of the web of the profile, and the universal rolling machine is provided before the final rolling pass by the universal rolling machine. Set the skew roll of the skew roll type rolling mill separately provided close to the rear surface at a predetermined position,
A method for rolling a profile having a flange, characterized in that the web height of the profile is expanded after the final rolling pass by the universal rolling mill.

5. Vertical horizontal rolls with cutouts having a cross-sectional area corresponding to at least 1/4 of the minimum required surplus area obtained from the target width expansion of the web height and the product web thickness on the left and right peripheral surfaces of the horizontal rolls. By using at least one or more universal rolling mills in the intermediate rolling process having the above and a diagonal roll type rolling mill separately provided in proximity to the rear surface of the universal rolling mill, the surplus thickness of both end portions of the web of the profile is set to a predetermined value. Adjusting to a cross-sectional area, immediately before the final rolling pass by the universal rolling mill, set the skew rolls of the skew rolling mill at a predetermined position, and shape after the final rolling pass by the universal rolling mill. A method for rolling a profile having a flange, characterized in that the web height of the strip is widened.

6. When forming a surplus portion at both ends of the web of the profile with the upper and lower horizontal rolls of the universal rolling mill, the vertical roll of the universal rolling mill is moved to the rolling out side or rolling in side to move the flange to the web. A method for rolling a profile having a flange, characterized in that the shape of a surplus portion is roughly adjusted by adjusting a metal flow.

[0026]

The following is a more detailed description of the rolling mill train of the present invention, the method for determining the amount of the notches provided on the upper and lower horizontal rolls of the universal rolling mill, and the method for adjusting the excess thickness reduction with reference to FIGS. 1 to 5. explain.

FIG. 1 shows a rolling mill train provided by the present invention.
It is shown in (a) and FIG. 1 (b). FIG. 1A is a rough rolling machine 1 (BD) for supplying a beam blank 4, a notch portion for rolling the beam blank 4 into a substantially H shape and forming a surplus thickness 18 at both ends of the web 2a. , A universal rolling mill RU having upper and lower horizontal rolls 2H formed on each of the left and right circumferential surfaces, an edger rolling mill E forming a width F of the flange portion 1a, and adjusting the extra thickness and depending on the case, adjusting the web height. A diagonal roll type rolling mill 141 (SS1) provided in the vicinity of the universal rolling mill RU for widening, and a diagonal roll type rolling mill 142 (SS) that widens the web height while rolling the excess thickness.
2), and an array of devices configured by the finish rolling mill 3 that rolls down to products. Further, FIG. 1B shows a rough rolling mill 1 (BD) for providing a beam blank 4, a notch for rolling the beam blank 4 into a substantially H shape and forming a surplus thickness 18 at both ends of the web 2a. The width F of the universal rolling mill RU and the flange portion 1a having upper and lower horizontal rolls 2H formed on the left and right peripheral surfaces and a vertical roll 2V having a mechanism for changing the position to the rolling out side or rolling in side An edger rolling mill E to be formed, a skew roll rolling mill 141 (SS1) provided in proximity to the universal rolling mill RU for adjusting the excess thickness and optionally expanding the web height, This is a device row composed of a diagonal roll type rolling mill 142 (SS2) that widens the web height while rolling the excess thickness, and a finish rolling mill 3 that rolls the product.

Here, the above-mentioned skew roll type rolling mill 141
(SS1) is a roll capable of rolling down a surplus portion formed in the cutout portion of the universal rolling machine, and a plane in which the horizontal plane projection lines of the roll axes of the pair of left and right skew rolls are perpendicular to the rolling direction. The angle θH is defined as 0 to an appropriate angle, and the left and right roll gaps and the upper and lower roll gaps can be arbitrarily changed.

Next, a description will be given of a method of determining the amount of the notch portions 50 provided on each of the left and right peripheral surfaces (4 places) of the upper and lower horizontal rolls 2H of the universal rolling mill RU shown in FIG. As shown in Fig. 3, the target widening amount ΔWi of each product on the skew roll when products of different series are manufactured with the same roll and the same web height in each series is as shown in Fig. 3. This is the difference between the width IWmin and the assumed web inner width IWi after the web height is made constant, and this target widening ΔWi and the product web central thickness tw.
The maximum value of the product (area) with and is shown in FIG. 1 (a) and FIG. 1 (b).
The amount of the extra thickness 18 formed by the intermediate universal rolling mill RU, ie, the minimum required extra thickness area. The amounts (cross-sectional areas) A0 of the four cutout portions 50 on the left and right circumferential surfaces of the upper and lower horizontal rolls are set so as to correspond to at least 1/4 of the required minimum surplus area.

The adjustment of the excess thickness reduction is performed by using the oblique roll type rolling mill 141 in the rolling apparatus row of FIG. 1 (a) or an intermediate state between the oblique rolling type rolling machine 141 of the rolling apparatus row of FIG. 1 (b). It is performed using the universal rolling mill RU. In the following, the function of adjusting the rolling mill row in FIGS. 1A and 1B is also explained, and the method of adjusting the excess thickness by the oblique roll type rolling mill 141 and the method of adjusting the excess thickness reduction by the intermediate universal rolling mill RU are described. Will be described in detail.

First, a description will be given of a method for adjusting the excess wall thickness reduction by an oblique roll type rolling mill provided close to the intermediate universal rolling mill.

For sizes that do not require widening, the surplus thickness at both ends of the web of the profile formed in each rolling pass by the intermediate universal rolling mill is set to zero degrees for the cross angle θH for each pass. Complete reduction is performed by the skew roll type rolling mill. At this time, the reduced surplus flows in the width direction to widen the web height, so that the web height is reduced in the next rolling pass by the intermediate universal rolling mill. Usually, when the web height is greatly reduced, the web 2a buckles as shown in FIG. 13 and the dimensional accuracy is reduced. However, as described above, when the excess thickness is completely reduced in each rolling pass. Is the filling degree of surplus per rolling pass by the intermediate universal rolling machine (ratio of the surplus forming area to the total area of the roll notch (percentage))
4 is about 20% as shown in FIG. 4, and the rate at which the surplus which is rolled down by a normal horizontal roll flows in the width direction is 3%.
Since it is about 0%, for example, assuming that the required minimum surplus area is the area when the target widening amount is 100 mm, the cross roll θH is set to zero degree, and the oblique roll type rolling mill is used for each rolling pass. The amount of widening when the excess thickness is reduced by 1 is
It is 00 mm × 0.3 × 0.2, that is, 6 mm. Even in the rolling of H-section steel by the current universal rolling mill, if it is large, reduction rolling of about 10 mm is performed due to the difference in roll cylinder width, and there is no problem even if reduction of 6 mm widened is performed.

Further, since the oblique roll type rolling mill is installed in the vicinity of the intermediate universal mill and the tandem reciprocating pass rolling can be performed, the rolling pass time can be relatively shortened, the productivity is lowered and the rolling material There is no problem of temperature drop.

Regarding the size for maximum widening, the oblique roll type rolling mill provided close to the intermediate universal rolling mill is not used (during this period, the roll of the oblique rolling type rolling mill or the rolling mill is used). (Not shown in the figure) is retracted by an appropriate method), only the intermediate universal rolling mill is rolled up to one pass before the final rolling pass, and the notch portions provided on the left and right peripheral surfaces of the upper and lower horizontal rolls are rolled. Completely fill the rolled material. Then, before the final rolling pass of the intermediate universal rolling mill, the cross angle θ of the skew roll is
H, the space between the left and right rolls, and the gap between the upper and lower rolls are set to predetermined values, and the web height is widened by the oblique rolls after the final rolling pass by the intermediate universal rolling mill.

As described above, the case where the extreme widths are not widened and the case where the maximum width is widened have been described. However, in the case where the widening between them is performed, the cross angle θH
Is not set to completely reduce the surplus for each rolling pass by the oblique roll type rolling mill set to zero degrees, but after being reduced to a predetermined amount of surplus, the final rolling pass of the intermediate universal rolling mill Immediately after the rolling one pass before is completed, the cross angle θH of the skew rolls, the distance between the left and right rolls, and the gap between the upper and lower rolls are set to predetermined values, and following the final rolling pass by the intermediate universal rolling mill, Widen the web height with a skew roll. In addition, except when not widening,
(A) and FIG. 1 (b) are combined with the widening in the oblique roll type rolling mill 142 to efficiently perform large widening.

Subsequently, upper and lower horizontal rolls having cutouts for forming a surplus at both ends of the shape member formed on the left and right peripheral surfaces, respectively, and a mechanism for changing the position to the rolling-out side or rolling-in side. A method of adjusting the excess thickness reduction by the universal rolling machine RU having a vertical roll having Figure 5
Figure 2 shows a general schematic diagram of the metal flow from the flange to the web during universal rolling. The symbol in the figure is Aw
0, Aw1 is the web cross-sectional area before and after rolling, Af0, Af
1 indicates the flange cross-sectional area before and after rolling, and ΔM indicates the metal flow from the flange to the web. Also.
ΔM can be expressed by an equation.

ΔM = (Af0 · Aw1−Aw0 · Af1) / (2Af0 + Aw0) The technique disclosed in Japanese Patent Application Laid-Open No. 63-199001 proposed by the applicant of the present application is that the vertical roll is moved to the rolling-in side so that Flow from flange to web of ΔM
Is a technique for controlling the flange width by using the characteristic that the metal flow ΔM from the flange to the web can be reduced when the vertical roll is moved to the rolling exit side. In the present invention, by utilizing this means, when a large surplus is required, the vertical roll is moved to the entrance side to promote the metal flow ΔM from the flange to the web, and the notch of the horizontal roll of the universal rolling mill is used. If the steel material is rolled so that the steel sheet is sufficiently filled with a small amount of extra thickness, the vertical roll is moved to the exit side to reduce the metal flow ΔM from the flange to the web, and the notch of the horizontal roll of the universal rolling mill is used. The part is rolled so that the part is not filled with steel.
If this rolling method is combined with the above-described method for adjusting the excess thickness reduction by the oblique roll type rolling mill, the excess thickness reduction adjustment can be performed more effectively.

[0038]

EXAMPLES In the following, a conventional skew roll rolling method is used in the case where an H-section steel having a web height of 600 mm and a flange width of 200 mm and an H-section steel having a web height of 650 mm and a flange width of 200 mm are manufactured by the same roll. (Tokuhei 3-
No. 42122) will be described in comparison with the case where the present invention is applied.

Table 1 shows the rolling effect when the conventional skew roll rolling method is applied. Set margin is constant (7
Since it is 50 mm ² ), for the size that the expansion amount may be small, the surplus remaining without being reduced by the skew roll must be reduced by the finish rolling mill, but the finish rolling mill is structurally It was confirmed that the remaining amount (remaining thickness of the web-thickness of the central portion of the web) was increased due to the low rigidity. Since there was sufficient extra thickness, no constriction occurred.

[0040]

[Table 1]

On the other hand, Table 2 shows the rolling results when the present invention was applied. In this example, the angle θH is calculated as described above.
By adjusting the excess amount by adjusting the amount of excess thickness by combining the excess thickness reduction by the diagonal roll type rolling mill set to 0 degree and the excess thickness forming by the universal rolling machine that can move the vertical rolls to the rolling in and out sides. Widening rolling was performed by the two oblique roll type rolling mills set at the position, and finally, it was shaped by the finishing rolling machine in which the body width of the horizontal rolls was variable. As a result, the filling degree of the rolled material in the cutout portion of the horizontal roll is from about 0% to 1%.
It was possible to control up to 00%. In addition, with regard to the size requiring widening, no constriction was generated and a product with good dimensional accuracy was obtained.

[0042]

[Table 2]

Although the rolling equipment for H-section steel has been described above, the present invention can be similarly applied to the rolling of a profile having a flange, such as channel steel and I-section steel. Of course, the present invention can be applied to rolling of aluminum or plastic other than hot steel.

[0044]

By applying the present invention to a manufacturing process of a profile having a flange by a skew roll system, no web constriction occurs even if an extremely large web widening is performed by the skew roll, and the web is Even when the width is not widened, finish rolling can be performed on a product having a good web thickness distribution, and an H-section steel product series having an arbitrary web height can be manufactured with good quality and an extremely small number of rolls.

Further, since the skew roll rolling mill is used for both surplus shaping and widening, one skew roll rolling mill is added to the existing skew rolling mill rolling line. Efficient surplus shaping and efficient two-step widening are possible with inexpensive capital investment.

[Brief description of drawings]

1A and 1B are schematic views of a rolling method for H-section steel according to the present invention.

2A and 2B are schematic views of a method of providing cutouts on the left and right peripheral surfaces of upper and lower rolls by the intermediate universal rolling mill of the present invention.

FIG. 3 is an explanatory diagram of a method for determining a minimum required surplus area.

FIG. 4 is an explanatory diagram of a surplus fill degree (a ratio (percentage) of a surplus forming area to a required minimum surplus area) of each rolling pass by the intermediate universal rolling mill with respect to the total area of the roll cutout portions.

FIG. 5 is a schematic diagram of a metal flow from a flange to a web during universal rolling.

FIG. 6 is an explanatory view of an oblique roll type rolling method.

7 (a) and (b): Function explanatory diagrams of an apparatus row and a rolling method for skew roll rolling. (C): Schematic of the product by the skew roll rolling method.

FIG. 8 is an explanatory view of a constriction.

9A and 9B are explanatory views of typical examples of a conventional H-section steel rolling device train and cross-sectional shapes of materials rolled by rough, intermediate, and finishing rolling mills.

FIG. 10 is a functional explanatory view of a universal rolling machine based on a relationship between a universal rolling roll for rolling H-section steel and a material to be rolled.

FIG. 11 is an explanatory diagram of a product series having a constant web inner width.

FIG. 12 is a schematic view of a widening rolling facility having two publicly disclosed skew roll rolling mills.

FIG. 13 is a schematic diagram of web buckling that occurs when a large web height reduction rolling is performed.

FIG. 14 is a schematic view of a widening rolling facility for adjusting the amount of surplus wall that is open to the public and performing a backward skew roll rolling.

FIG. 15 is an explanatory diagram of extra meat.

[Explanation of symbols]

 1: Breaking rolling mill 2: RU-E rolling mill group 3: Finishing universal rolling mill 4 to 6: Rolling material 7: Upper horizontal roll 8: Lower horizontal roll 9: Gap between upper and lower horizontal rolls 10, 11: Left and right vertical rolls 12, 13: Gap between vertical roll and horizontal roll 14: Oblique roll type rolling machine 15, 15 ': Oblique roll 16, 16': Oblique roll 17: Rolled material 18: Extra thickness 19, 19 ', 20, 20 ': Outside surface of skew roll 21, 22: Inside flange of rolled material 25, 27, 28, 29, 30, 31: Rolled material 41: Corner R portion of rolled material 42: Central portion of rolled material 43: Constriction 50: Notch part 101: Rough rolling mill 102, 103: Intermediate rolling mill 104, 105: Oblique roll type rolling mill 106: Finishing rolling mill 113: Orthogonal rolling mill 141: Additional diagonal rolling type rolling mill 14 : Skew roll method rolling mill

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushige Ikuta 1 No. 1 Tsukiko Hachimancho, Sakai City Nippon Steel Co., Ltd. Inside the Sakai Works (72) Inventor Hiroshi Yamashita No. 1 Tsukiko Hachimancho, Sakai City New Japan Inside the Sakai Steel Works

Claims (6)

[Claims] 1. A profile rolling apparatus in which a skew rolling mill is arranged between the intermediate rolling step and the finish rolling step of a profile rolling process comprising a rough rolling step, an intermediate rolling step, and a finish rolling step. In the row, at least one of the minimum necessary surplus area calculated from the target width expansion amount of the web height and the product web thickness on each of the left and right circumferential surfaces of the upper and lower horizontal rolls of at least one or more universal rolling mills in the intermediate rolling step is performed. Providing a notch with a cross-sectional area equivalent to / 4,
And a rolling apparatus train for a profile having a flange, characterized in that an oblique roll type rolling mill is separately provided near the rear surface of the universal rolling mill. 2. The flange according to claim 1, wherein at least one or more universal rolling mills in the intermediate rolling step have a vertical roll having a mechanism for changing the position to the rolling-out side or the rolling-in side. Row of rolling mills for profiles with. 3. A web of a profile, wherein an oblique roll type rolling mill is arranged between the intermediate rolling process and the finish rolling process of the profile rolling process consisting of a rough rolling process, an intermediate rolling process and a finish rolling process. In a method of rolling a profile for widening the height, according to the target widening amount of the web height and the product web thickness on each of the left and right peripheral surfaces of the upper and lower horizontal rolls of at least one universal rolling machine in the intermediate rolling step, Providing a notch with a cross-sectional area corresponding to at least 1/4 of the required minimum surplus area, and forming a surplus at both ends of the web of the profile, close to the rear surface of the universal rolling mill for each rolling pass. A method for rolling a profile having a flange characterized in that the thickness of the surplus portion is reduced by a separately provided oblique roll type rolling mill so as to be equal to the thickness of the central portion of the web. 4. A web of a profile having a skew rolling mill disposed between the intermediate rolling process and the finish rolling process of the profile rolling process comprising a rough rolling process, an intermediate rolling process and a finish rolling process. In a method of rolling a profile for widening the height, according to the target widening amount of the web height and the product web thickness on each of the left and right peripheral surfaces of the upper and lower horizontal rolls of at least one universal rolling machine in the intermediate rolling step, A notch having a cross-sectional area corresponding to at least 1/4 of the required minimum surplus area is provided to form a surplus part at both ends of the web of the profile, and the universal rolling machine is provided. By the time before the final rolling pass by, the skew roll of the skew roll type rolling mill separately provided near the rear surface of the universal rolling mill is set at a predetermined position, and the Rolling method of profiles having flanges, characterized in that performing the widening of final rolling pass after the end of the frame members web height. 5. A web of a profile, wherein an oblique roll type rolling mill is arranged between the intermediate rolling process and the finish rolling process of the profile rolling process comprising a rough rolling process, an intermediate rolling process and a finish rolling process. In the method of rolling a profile that widens the height, it is equivalent to at least 1/4 of the minimum required surplus area calculated from the target width of web height and the product web thickness on the left and right peripheral surfaces of the upper and lower horizontal rolls. By at least one or more universal rolling mills in the intermediate rolling step having upper and lower horizontal rolls provided with cutouts having a cross-sectional area, and a skew roll rolling mill separately provided near the rear surface of the universal rolling mill. Adjusting and rolling the surplus thickness of both end portions of the web of the profile to a predetermined cross-sectional area, and immediately before the final rolling pass by the universal rolling machine, place the skew rolls of the skew roll type mill at predetermined positions. Constant to the rolling method of profiles having flanges, characterized in that performing the widening of the final rolling pass after the end of the frame members web height by the universal rolling machine. 6. A vertical roll of a universal rolling machine is rolled out when forming a surplus portion at both ends of a web of a profile with at least one upper and lower horizontal roll of a universal rolling machine in the intermediate rolling process. Side or rolling-in side to adjust the metal flow from the flange to the web to roughly adjust the shape of the excess thickness portion. Rolling method of material.