JPH10263645A - Manufacture of shaped steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing shaped steel much more excellent in dimensional accuracy of products and with less surface defects. SOLUTION: A press machine, two-high mill or universal mill 10 is arranged on the upper stream side of a break down mill BD, and based on the measured data of dimensional gage S the dimension of pre-BD mill 10 is controlled, and then a beam blank of optimum dimension is formed. After that, this beam blank stock is supplied to the break down mill BD, and further based on the measured data of dimensional gage S0 the dimension of break down mill is controlled, and thus the stock is supplied to a rough universal mill R1, and thereby wide flange beam of high accuracy and with less surface defect is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an H-beam, an I-beam,
The present invention relates to a method of manufacturing a shaped steel such as a channel steel, and particularly to a manufacturing method of a shaped steel having excellent dimensional accuracy and shape by hot rolling and online cold straightening.

[0002]

2. Description of the Related Art Shaped steels such as H-shaped steels are generally manufactured by hot rolling using a double rolling mill and a universal rolling mill, and then are subjected to a roller straightening machine to correct bending and warping. In this case, as problems in manufacturing the shaped steel, there are a problem of dimensional accuracy and shape defect at the time of rolling and a problem of shape defect at the time of roller straightening.

First, an example of a dimensional defect in the case of an H-section steel is shown in FIG. FIG. 4A shows what is called the center deviation of the web.
This is a phenomenon in which the zero web 101 shifts up or down with respect to the center of the flange 102. This is mainly due to an improper biting position of the web with respect to the pass line in the universal rolling mill, and it is generally inevitable that the center of the web is deviated. Web center deviation S
Is defined by the following equation. S = | ab | / 2, where a, b: distance between flange end and web surface

[0004] FIG. 4B shows what is called flange thickness unevenness, and is a phenomenon in which a difference in flange thickness between the left and right or upper and lower sides occurs. This mainly occurs at an early or middle stage of rolling mainly due to an inappropriate shift amount of the upper and lower horizontal rolls due to a change in the web height. In addition, when such flange thickness deviation occurs, the rolling reduction of each flange changes after the middle stage of rolling, so that the above-described center deviation of the web occurs.

FIG. 4C relates to a change in the flange width. The front and rear ends of the material to be rolled are not restricted by the material. This is a phenomenon in which the width becomes smaller. This phenomenon remains in the product after correction (because the front and rear ends are uncorrected at the time of correction), and the increase amount ΔB of the flange width at the intermediate portion becomes about 1 to 3 mm in the final product stage. This phenomenon may be reversed (the flange width at the front and rear ends is large) depending on the rolling method or the like.

Among the above-mentioned problems of the dimensional accuracy, there have been many proposals for reducing the center deviation of the web, such as Japanese Patent Publication No. 6-53289 and Japanese Patent Laid-Open Publication No. Hei 6-218413. For example, in the method disclosed in the former publication, a web or flange roller guide device is provided on the entrance side of the universal rolling mill, and a web center deviation measuring device is provided on the entrance side or exit side, and the measurement of the measuring device is performed. Based on the data, the vertical position of the roller guide device is separately adjusted on the mill driving side and the mill operating side. The latter publication discloses an apparatus in which guide rollers of flanges are provided on guide blocks positioned above and below a web. In each case, the center deviation of the web is reduced by individually adjusting the vertical position of the roller guide device with respect to the pass line.

Next, FIG. 5 shows an example of a shape defect at the time of straightening the roller. (A) is vertical bending, (B) is horizontal bending, (C) is one or both of the flanges falling (warping), and (D) is the end (particularly the top in the rolling direction) bending. Is shown. FIG. 6 shows an example of a web height variation caused by the roller straightening machine. The web height variation ΔH in the middle portion is usually in the range of 1.0 to 3.0 mm.

[0008] The causes of such a shape failure of the H-section steel and problems in conventional measures against the shape failure are described below.

[0009] The end of the rolled material, especially the top in the rolling direction, is subject to the rolling method (difference in elongation rate between flange and web).
Inevitably, it becomes an unsteady part. In addition, the temperature tends to be low, and further, when biting into the rolling roll, the biting position is likely to be inappropriate, so that the rolled material comes into contact with a guide or the like, as shown in FIG. End bending occurs.
Even if you try to straighten this end bend with a roller straightener,
As shown in FIG. 7, since the straightening rolls 11 are vertically staggered, straightening cannot be performed, and the top portion 103 of the H-section steel 100 is an uncorrected portion. Therefore, the correction of the top portion 103 can be performed only offline.

[0010] Regarding the bending in the longitudinal direction shown in FIG. 5A, there is a temperature difference between the thick flange portion and the thin web portion at the rolling stage. Otherwise (generally, unless the forced cooling or the like is performed, heat is trapped between the lower flange portions of the H-section steel, so that the lower flange temperature is high), and therefore, particularly, bending in the vertical direction occurs. In addition, during cooling after the end of rolling, especially when cooling is performed in an I-shape posture (in general, the I-shape is charged due to the loading efficiency of the cooling floor), as shown in FIG. Depending on the degree of closeness of the charging row, bending in the left-right direction may occur (FIG. 5B). Conventionally, as a means for suppressing such bending, there have been numerous methods of reducing the temperature difference between the flange portion and the web portion by water cooling during rolling (Japanese Patent Publication No. 6-75734, Japanese Patent Application Laid-Open No.
Conversely, if the water cooling of the flange portion is not appropriate, a new shape defect such as a flange fall (inward warp or outward warp of the flange) as shown in FIG. 5C occurs.

Regarding the shape failure of the H-section steel and the fluctuation of the web height shown in FIGS. 5 and 6, the shaft adjustment / width adjustment mechanism of the roller straightener RS is configured as shown in FIG. The H-shaped steel 100 is straightened after adjusting the axial spacing of the arranged horizontal straightening rolls 11 in the direction of the roll axis 13 by adjusting the thrust and the roll width, and adjusting the width of the vertical straightening rolls 12 arranged on the left and right sides. However, since the top portion 103 and the bottom portion 104 of the H-section steel 100 cannot be straightened due to the mechanism of the roller straightening machine 10, the top portion 1 and the bottom portion 104 are not formed.
The web height dimension H of the reference numeral 03 and the bottom portion 104 hardly fluctuates before and after the correction, and the portions other than the end portions are larger than before the correction. The fluctuation amount ΔH of the web height is usually 1.0 to
It is 3.0 mm, and off-line work (press straightening, cutting, etc.) is required for a part outside the standard dimensions.

[0012]

By the way, conventionally, one kind of beam blank material 1 having a size and a shape as shown in FIG. Rolled H-section steel
Had been manufactured. The beam blank material 1 is manufactured by continuous casting.
It is limited to the type, and it corresponds to various sizes by rolling.
For this reason, a rough rolling mill group consisting of a breakdown mill, a coarse universal mill, and a rough edger mill is trying to roughly roll to the target final beam blank shape and dimensions, but it is not possible to control the dimensions at all in the breakdown mill. As a result, there is a limit in improving the dimensional accuracy of the H-beam as a product, and there is a problem that if a flaw occurs during rough rolling, it remains as a surface defect of the product.

The present invention has been made to solve the above problems, and has as its object to provide a method of manufacturing a shaped steel having higher dimensional accuracy of a product and less surface defects.

[0014]

SUMMARY OF THE INVENTION A method for producing a section steel according to the present invention comprises a breakdown mill and a coarse universal mill, a rough rolling step using a coarse edger mill, an intermediate rolling step using an intermediate universal mill and an intermediate edger mill, and a finishing universal mill. In the method for producing a shaped steel in which the material to be rolled is rolled through a finish rolling step according to, and then the finished material is straightened by a roller straightening machine, a press machine or a double rolling mill or a universal mill is provided upstream of the breakdown mill. A dimensional gauge for measuring the size and shape of the material to be rolled is provided on the entrance side or the exit side of the press machine or the double rolling mill or the universal mill, and the material extracted from the heating furnace is provided with the dimensional gauge. Based on the measured data, control the dimensions of the press, double rolling mill or universal mill. It allows the supplies to the breakdown mill as a beam blank material optimum dimensions,
Further, the beam blank material is supplied to the coarse universal mill as an optimal shaping material by performing dimensional control of the breakdown mill based on measurement data of a dimension meter provided on an entrance side or an exit side of the breakdown mill. Then, the subsequent rolling is performed.

In the first production method of the present invention, the raw material extracted from the heating furnace is measured by a press machine, a double rolling mill, or a universal mill breakdown mill having a dimension gauge disposed upstream of the breakdown mill. After optimizing the beam blank material by dimensional control, this beam blank material is supplied to the breakdown mill, and the breakdown mill is then measured based on the measurement data of the dimension meter arranged on the entrance or exit of the breakdown mill. Dimension control, and the molding material with the optimal dimensions obtained by this is supplied to the coarse universal mill and rolled, so that products with sufficiently high accuracy can be obtained without performing dimensional control from the coarse universal mill to the finish universal mill. can get. Further, since a beam blank material having an optimal size is supplied to the breakdown mill, the occurrence of surface defects such as flaws is extremely reduced.
Furthermore, a material close to the shape of a final beam blank and a material that can be easily converted into a final beam blank can be supplied to a breakdown mill for each desired size, and efficient and high-precision rolling can be performed.

According to a second manufacturing method of the present invention, a press machine, a double rolling mill or a universal mill is disposed upstream of the breakdown mill, and an inlet of the press machine, a double rolling mill or the universal mill is provided. Alternatively, a dimension gauge for measuring the dimension and shape of the material to be rolled is provided on the delivery side, and the material extracted from the heating furnace is sized based on the measurement data of the dimension gauge to the dimensions of the press, the double rolling mill, or the universal mill. By performing the control, it is supplied to the breakdown mill as a beam blank material of the optimal size, and then, based on the measurement data of a dimension meter provided on the entrance side or the exit side of the breakdown mill, the beam blank material is supplied. By controlling the dimensions of the breakdown mill,
Supplied to the coarse universal mill as the optimal molding material,
Further, based on the measurement data of the dimension meter provided on the entrance side or the exit side of the intermediate universal mill and the finishing universal mill, the optimal control system performs the dimension control from the coarse universal mill to the finishing universal mill, and then the According to the present invention, the material to be rolled is corrected by an optimum control system based on measurement data of a dimension meter provided on the entrance side or the exit side of the roller straightening machine.

In the second manufacturing method, in addition to the dimensional control of a breakdown mill and a press, a double rolling mill or a universal mill disposed upstream thereof, the dimensional control from a coarse universal mill to a finished universal mill is performed. And the dimensions of the roller straightening machine are controlled. By supplying the material with the optimal dimensions to the coarse universal mill, the measurement of the dimension gauge arranged on each entrance or exit side of each universal mill and roller straightening machine Based on the data, dimensional control is performed by the optimal control system.

The dimensional control in each universal mill is performed as follows. The finishing dimensions of the finishing material are measured by the dimension gauge provided on the output side of the finishing universal mill, and the measurement data is fed back to each rolling mill, each edger mill, and the dimension gauge and constraint guide device on the entrance side of the finishing universal mill, While feeding back the measurement data by the dimension gauge on the input side of the intermediate universal mill to the breakdown mill and the coarse universal mill group, feed forward to the intermediate universal mill, intermediate edger mill, finish universal mill, and guide device of the intermediate rolling mill group, Further, the measurement data from the dimension meter on the entrance side of the finishing universal mill is fed forward to the guide device for the finishing material, and based on the measurement data from these dimension meters, the optimal control system determines the optimal indicated value, and Roll-down set value, thrust adjustment value, edger Short stroke adjustment value Le, and controls the guide interval setting value of the guide roller device between paths or between bars. For this reason, it is possible to roll a shaped steel having much higher dimensional accuracy than the conventional method.

The dimensional control in the roller straightening machine is performed as follows. After finishing the rolling, the dimensions and shape of the finished material are measured with a dimension meter provided on the exit side of the finishing universal mill or on the entry side of the roller straightening machine, and the measured data is transferred to a constraint guide device provided on the exit side of the finishing universal mill. Feedback,
Guide setting value of constraint guide device (guide path line,
Refers to width and height. same as below. ) By controlling
Controls how the next material comes out. Thereby, particularly, the occurrence of the bending of the end portion can be prevented. After finishing the rolling, the dimensions and shape of the finished material (here, the web height) are measured with the dimension meter on the exit side of the finishing universal mill.
The measured data is fed forward to the width adjusting mechanism of the horizontal straightening roll of the roller straightening machine, and the straightening is performed with the optimum inner straightening dimension. Further, by controlling the width of the vertical straightening roll of the roller straightening machine, it is possible to manufacture a product having a small variation in web height. After finishing the rolling, the dimensions and shape of the finished material are measured with a dimension meter provided on the entrance or exit of the roller straightener, and based on the measurement data, the roll gap adjustment, roll thrust adjustment, and roll width adjustment of the straightening roll By performing feedback or feed-forward for optimal size / shape control, a product excellent in size / shape can be manufactured.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a configuration diagram of an H-section steel production line by a production method according to Embodiment 1 of the present invention. In FIG. 1, HF denotes a heating furnace, and 10 denotes a press machine, a double rolling mill, or a universal machine arranged upstream of a breakdown mill BD for forming a material having a rectangular cross section extracted from the heating furnace HF into a beam blank shape. Mill, this press or double rolling mill or universal mill
A dimension meter S for measuring the dimensions of each part of the material is provided on the entrance side or exit side of the pre-BD mill 10 to control the dimensions of the pre-BD mill 10. BD is breakdown mill, E
1 is a rough edger mill, R1 is a rough universal mill, and these form a rough rolling mill group for a material to be rolled. A dimension gauge S0 is provided on the entrance side or the exit side of the breakdown mill BD to control the dimensions of the breakdown mill BD. R2 and E2 are intermediate universal mills and intermediate edger mills that constitute the intermediate rolling mill group, respectively, and GR is a guide device provided on the entry side of the intermediate universal mill R2 to guide the material to be rolled. F is a finishing universal mill, on the entry side of which a guide device GF having the same configuration as that of the above GR is installed, and on the exit side thereof, a constraint guide device GFD for restricting and guiding the finishing material is installed. RS is a roller straightening machine connected to a rolling line composed of each of the above mills and an edger mill.

In the production line of the H-section steel configured as described above, first, the material (slab, billet, etc.) extracted from the heating furnace is supplied to the pre-BD mill 10, where the beam blank of a required size is produced. Form into shape. The supply material has a thickness B: 200 mm or more as shown in FIG.
500 mm × width H: a cast steel material having a rectangular cross section of 200 mm to 2000 mm.
It is formed into a shape close to a final beam blank (FBB) shape by a mill 10. At this time, the measurement data of the beam blank material measured by the dimension meter S is fed back to a control device (not shown) of the pre-BD mill 10 to control the dimensions of the pre-BD mill 10. FIG. 3B shows a sectional shape of the final beam blank 1 and a dimension table of each part.
In this example, molding is performed in eight sizes, and the finished dimensions of the breakdown mill BD for each size are shown.

As described above, by controlling the dimensions of the pre-BD mill 10, the material is supplied to the breakdown mill BD as a beam blank having a shape and dimensions close to that of the final beam blank 1, and the beam blank is measured by the dimension meter S0. Breakdown Mill BD data
Feed-forward to a control device (not shown) of the above (when a dimension gauge S0 is provided on the inlet side of the breakdown mill BD)
In addition, the size control of the breakdown mill BD is performed by performing the feedback (when the dimension meter S0 is provided on the exit side of the breakdown mill BD). For this reason, a beam blank material having an optimal size is manufactured. By supplying this beam blank material to mills subsequent to the coarse universal mill R1, sufficiently high accuracy can be obtained without performing dimensional control of each universal mill. H-section steel can be rolled. In each of the mills from the coarse universal mill R1 to the finish universal mill F, rolling is only performed at a normal rolling reduction setting. In the roller straightening machine RS, the finished material after rolling is simply cold-straightened online by a usual method.

Embodiment 2 FIG. FIG. 2 is a configuration diagram of an H-section steel production line by a production method according to Embodiment 2 of the present invention. In this example, in addition to the dimension gauges S and S0, the outlet side of the coarse universal mill R1 (intermediate universal mill R
2), the exit side of the intermediate universal mill R2 (the entrance side of the finishing universal mill F) and the exit side of the finishing universal mill F are provided with dimension meters S1, S2, and S3, respectively. Dimensions on entry and exit sides
Shape meters K1 and K2 are provided, and optimal dimension control is performed by a process computer P / C based on these measurement data. As in the case of FIG. 1, the dimensions of the pre-BD mill 10 and the breakdown mill BD are controlled based on the measurement data of the dimension meters S and S0, and the material having the optimal dimensions is supplied to the coarse universal mill R1. Size control is also performed on the mill.

The measurement timings, measurement targets and control items of the dimension gauges S1, S2 and S3 are as shown in Table 1. The dimension gauge S1 installed on the entrance side of the intermediate universal mill R2 measures the measured values. It feeds back to the breakdown mill BD and the group of coarse universal mills, and feeds forward to the intermediate universal mill R2, intermediate edger mill E2, guide device GR, and finish universal mill F, respectively. The dimension meter S2 installed on the output side of the intermediate edger mill E2 feeds the measured value to the guide device GF on the input side of the finishing universal mill F. The dimension gauge S3 installed on the exit side of the constraint guide device GFD reads the measured value from all the rolling mills (BD,
R1, R2, F) and edger mill (E1, E2)
And also feeds back to the dimension meter S2.

[0025]

[Table 1]

However, in Table 1, R1 finish: measured at the last pass of R1 mil R2 even pass: measured at the even pass of R2 mil R2 last pass: measured at the last pass of R2 mil F finish: F mill FB: Feedback control FF: Feed forward control FBBt1: Breakdown finished web thickness (final beam blank web thickness) B: Flange width (see FIG. 11) H: Web height (same as above) t1: Web Thickness (same as above) t2: Flange thickness (same as above) P / L: Pass line (same as above) Axis: Shift amount in the horizontal roll of each universal mill in the thrust direction S: Web center deviation (= | ab | / 2) )

The dimension / shape meter K1 on the entry side of the roller straightening machine RS measures the dimension / shape of the material to be straightened before the straightening, feeds the measured data to the roller straightening machine RS, The gap setting value, the width setting value of the horizontal straightening roll 11 and the vertical straightening roll 12, and the thrust adjustment value of the horizontal straightening roll 11 are corrected and fed back to the constraint guide device GFD, and the guide set value of the constraint guide device GFD for the next material. To correct.

The dimension / shape meter K2 on the output side of the roller straightening machine RS measures the dimension / shape of the material to be straightened after the straightening and feeds back the measured data to the roller straightening machine RS.
The gap set value of the horizontal straightening roll 11, the width set value of the horizontal straightening roll 11 and the vertical straightening roll 12, and the thrust adjustment value of the horizontal straightening roll 11 are corrected. In these control system systems, priority is automatically determined from a plurality of instruction values, and an optimal instruction is performed.

[0029]

Next, specific examples of the present invention will be described.

(Example 1) Size of H-section steel, H200 × B200
× 8/12, H500 × B200 × 10/16, H900 × B300 × 16/28
For the species, the conventional method (FIG. 12) and the method of the present invention (FIG. 1)
And finished dimensions and shapes of the products were compared. In the conventional method, each rolling mill is manufactured as shown in FIG.
The finishing material is subsequently corrected by the roller straightening machine RS, and the restraining guide device G of the finishing universal mill F is used.
Install the dimension meter S3 only on the exit side of the FD, and
Based on the measurement data obtained in Step 3, manually adjust the rolling set value of each mill roll and the guide set values of the guide devices GR, GF, and the constraint guide device GFD, and manually measure the dimensions and shape of the product after correction. Then, based on the measurement data, the gap set value of the horizontal straightening roll and the width set value of the horizontal straightening roll and the vertical straightening roll of the roller straightening machine RS are manually corrected. The method of Example 1 is
It is manufactured by the arrangement of each rolling mill as shown in FIG. 1, and the finished material is straightened by the roller straightening machine RS.
Material dimensions are measured by a dimension meter S provided on the output side of the pre-BD mill 10 and a dimension meter S0 provided on the output side of the breakdown mill BD, and the data is fed back to the pre-B
Only the dimensional control of the D mill 10 and the breakdown mill BD is performed to produce a beam blank having an optimum size, which is supplied to the coarse universal mill R1, rolled, and further corrected by the roller straightener RS. Finished dimensions of product
Table 2 shows the shape comparison results.

[0031]

[Table 2]

As is clear from Table 2, the method of the present invention in which only the dimensional control of the pre-BD mill and the breakdown mill is performed has a remarkable improvement effect on the center deviation of the web and the thickness deviation of the flange thickness, and the surface defect. It can be seen that the occurrence of occurrence is further reduced.

(Example 2) The same three kinds of sizes as those of Example 1 were manufactured by the method of the present invention (FIG. 2) and the conventional method (FIG. 12).
The finished dimensions and shapes of the products were compared. The conventional method is the same as the method of the first embodiment. The method of Example 2 is as follows:
As shown in FIG. 2, Example 1 is performed until a beam blank having an optimal size is supplied to the coarse universal mill R1 by dimensional control of the pre-BD mill 10 and the breakdown mill BD.
It is the same as that described above, and is also manufactured by performing dimensional control in each rolling mill and also performing dimensional control in the roller straightening machine RS. Further, in each rolling mill, a dimension gauge S1
The finished dimensions of the rough rolled material of the coarse universal mill R1 are measured according to the above, and based on this measurement data, the rolling reduction of each roll of the finishing mill F from the breakdown mill BD, the thrust adjustment of the rolls, and the short stroke of the edger mill are automatically performed. (The path schedule based on a preset model that is set in advance is automatically corrected.) In addition, the automatic correction of the rolling reduction of the rolls of the intermediate universal mill R2 and the finishing universal mill F is based on the measurement data of the dimension gauge S3 of the previous material (the material to be rolled immediately before the material) and prioritizes this data. In addition, the rolling reduction and the thrust adjustment were corrected. Further, the measurement data of the dimension gauge S1 is fed forward to the guide setting of the guide device GR on the entry side of the intermediate universal mill R2, the measurement data of the dimension gauge S3 is taken into the dimension gauge S2, learned, and the learned data is finished. The rolling is completed by feed-forwarding to the guide device GF on the entry side of the universal mill F, and subsequently, the measurement data of the dimension gauge S3 and the measurement data of the dimension / shape gauge K1 are learned. It feeds back to the GFD, controls the shape of the next material, further learns the measurement data of the dimension / shape meter K1 and the measurement data of the dimension / shape meter K2, and feeds the learned optimum indication value to the roller straightener RS. Based on the measured data, the roll gap adjustment, thrust adjustment, and roll width adjustment of the roller straightener RS are performed. There is obtained by so as to control the size and shape of the material. Table 3 shows the results of comparison of the finished dimensions.

[0034]

[Table 3]

As is clear from Table 3, the present invention has one step in all points of the web center deviation, the flange thickness deviation and the flange width difference as compared with the conventional method and the method of Embodiment 1. It can be seen that the product is excellent, and the bending of the product in the vertical and horizontal directions, the bending of the end, the falling of the flange, the fluctuation of the web height are extremely small, and the occurrence of surface defects is also extremely reduced.

[0036]

As described above, according to the present invention, the dimensional control of the rolled material by the pre-BD mill and the breakdown mill is performed. To supply and roll,
Shaped steel with high accuracy and few surface defects can be manufactured. Furthermore, in addition to the dimensional control in the pre-BD mill and the breakdown mill, the dimensional control is also performed in each of the mills and the roller straighteners, so that a shaped steel with higher accuracy and less surface defects can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a control system used in the present invention.

FIG. 2 is a configuration diagram showing another control system of the present invention.

FIG. 3 is a view showing a material shape and a final beam blank shape in the present invention.

FIG. 4 is an explanatory view showing an example of a dimensional defect of an H-section steel.

FIG. 5 is an explanatory view showing an example of a shape defect of an H-section steel.

FIG. 6 is an explanatory diagram showing a change in a web height of an H-section steel.

FIG. 7 is an explanatory diagram of a roller straightening machine.

FIG. 8 is an explanatory diagram of a shaft adjustment / width adjustment mechanism of the roller straightening machine.

FIGS. 9A and 9B are explanatory diagrams showing the arrangement of H-shaped steels on the cooling floor, wherein FIG. 9A is a plan view, FIG. 9B is a cross-sectional view taken along line AA, and FIG.
Is a sectional view taken along the line BB, and (d) is a sectional view taken along the line CC.

FIG. 10 is a diagram showing the shape and dimensions of a beam blank used in a conventional method.

FIG. 11 is an explanatory diagram showing dimensions of each part of the H-section steel.

FIG. 12 is a configuration diagram of a conventional method for comparison.

[Explanation of symbols]

HF: Heating furnace 10: Press or double rolling mill or universal mill BD: Breakdown mill E1: Coarse edger mill R1: Coarse universal mill R2: Intermediate universal mill E2: Intermediate edger mill F: Finish universal mill RS: Roller straightener S , S0, S1, S2, S3: Dimension gauge K1, K2: Dimension / shape gauge P / C: Process computer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B21D 3/05 B21B 37/00 BBG

Claims (2)

[Claims] 1. A material to be rolled is rolled through a breakdown mill and a coarse universal mill, a rough rolling step using a coarse edger mill, an intermediate rolling step using an intermediate universal mill and an intermediate edger mill, and a finish rolling step using a finishing universal mill. In a method of manufacturing a shaped steel in which a finishing material is straightened by a roller straightening machine, a press machine or 2 is provided upstream of the breakdown mill.
A heavy rolling mill or a universal mill is provided, and a dimension gauge for measuring the size and shape of the material to be rolled is provided on the entrance side or the exit side of the press machine or the double rolling mill or the universal mill, and extracted from the heating furnace. The material is supplied to the breakdown mill as an optimally sized beam blank material by performing dimensional control of the press machine, the double rolling mill or the universal mill based on the measurement data of the dimension meter, and further, the beam blank By controlling the dimensions of the breakdown mill based on the measurement data of the dimension meter provided on the entrance side or exit side of the breakdown mill, the material is supplied to the coarse universal mill as an optimal molding material, A method for producing a shaped steel, comprising rolling. 2. A rolled material is rolled through a breakdown mill, a coarse universal mill, a rough rolling process using a coarse edger mill, an intermediate rolling process using an intermediate universal mill and an intermediate edger mill, and a finish rolling process using a finishing universal mill. In a method of manufacturing a shaped steel in which a finishing material is straightened by a roller straightening machine, a press machine or 2 is provided upstream of the breakdown mill.
A heavy rolling mill or a universal mill is provided, and a dimension gauge for measuring the size and shape of the material to be rolled is provided on the entrance side or the exit side of the press machine or the double rolling mill or the universal mill, and extracted from the heating furnace. The material is supplied to the breakdown mill as a beam blank material having an optimal size by performing dimensional control of the press machine, the double rolling mill or the universal mill based on the measurement data of the dimension meter, and then supplying the beam. The blank material is supplied to the coarse universal mill as an optimal molding material by performing dimensional control of the breakdown mill based on measurement data of a dimension meter provided on an entrance side or an exit side of the breakdown mill, and further, Measurement of a dimension gauge provided on the entrance side or the exit side of the intermediate universal mill and the finish universal mill, respectively. The dimensional control from the coarse universal mill to the finishing universal mill is performed by the optimal control system based on the data, and then the optimal control system is performed based on the measurement data of the dimension meter provided on the entrance side or the exit side of the roller straightening machine. A method for producing a shaped steel, comprising: correcting a material to be rolled by using the method.