JPS58302A - Rolling of material for producing large shaped steel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rolling a material for large-sized section steel IJM, and more particularly to a method for rolling large-sized section steel with a wide 7-lunge web height of 1 m.

Conventional rolling methods typically involve the following steps.

The ingot is rolled on a rolling stand with two horizontal (blossoming or breaking) rolls to produce rectangular or square profiles (plumes). The rectangular profile can also be produced by continuous rolling, with or without subsequent rolling on roughing stands of blooming or breaking rolls, in order to obtain the desired dimensions. This profile must have a width slightly smaller than the width of the first molding hole mold used subsequently.

This forming hole mold is generally arranged on a stand with two horizontal rolls (blustering rolls or breaking rolls).

By realizing a plurality of rolling passes in this forming hole mold, a material is obtained in such a shape that it allows subsequent rolling on the stands of different rolling mills until the P patent is obtained. The thickness of the rectangular profile is selected in such a way that the entire profile part of the blank can be filled exactly.

These conventional methods have the following drawbacks.

It is necessary to coin copper ingots or continuous casting profiles of dense thickness.

In certain cases it is necessary to cut off the ends of the material before continuing rolling with another stand of the rolling mill, resulting in loss of material.

In order to eliminate these drawbacks, it has been proposed to use rectangular profiles instead of ingots as products from slabs. The basic idea of these methods is as follows.

The slab is compressed between two horizontal or vertical rolls to form seven flange at the end of the slab, and then rolled by a classic one-hole or common rolling stand to roll the slab at the end. You can get expanded material.

Widening of the edges of compacted slabs is a phenomenon well known to rolling mills and must therefore be taken into account when rolling rectangular products. The transformation of the shape of the free edge of the rectangular section to be rolled is such that there is a relationship between the thickness of the contact arc and the average height of the product, so that the rolling O a is closely connected with certain parameters. If ho is the initial height of the rectangular member and ho is the height of the rectangular member am, then this relationship is expressed by the following equation.

d q-down i where 1a-p approx.] ■ The width spread is constant so that an outflow of one material is realized in the direction perpendicular to the rolling direction and the rolling direction.

If the proportion of 9 is small, the widening of the free edge, which is not subject to the pressure of direct rolling, is preferentially limited at the end of the free edge, which is led to a shape reminiscent of a diapo-port. The half-height thickness of this profile is not affected by the deformation and remains constant.

When the proportion of width is large, the width is guided to a shape reminiscent of a barrel and is concentrated at half the height of the profile.
．． 7.0 At this limited value, the width spread of the confessional edge is constant over the height of the free edge. All methods of rolling shaped steel sections from slabs are based on the widening pattern obtained due to the small ratio values.

However, the method of using a general stand to prepare the material with #M teeth is very large and has 7 lunges.
The application is noodle in the case of.

Similarly, when compressing the width of a slab into a rotating hole type with an elongated width, the shape of the 7-lunges of the material cannot be completely controlled. Furthermore, the width of the two-stage roll base of a rough rolling mill is often limited, and the rolling mill is very large and has a large scale.
In the case of shaped steel sections with flanges, it is precluded to arrange a series of rotating holes on the roll.

An object of the present invention is to provide a method for rolling a material to appropriate dimensions, and to provide a method that requires only interference between a rotary hole mold and a smooth table part. The implementation is carried out in eight steps.

a. Compressing the width of the slab with a rotary hole mold whose sides exhibit a constant slope and whose bottom width is equal to or smaller than the thickness of the slab. The widening leads to the filling of this pore type, and the edges of the slab, depending on its width, are layered, reminiscent of a completely symmetrical mushroom in appearance.

b. The width of the slab produced in step a is compressed using one part of the engineering machine. This compression has the effect of deforming the mushroom by reducing its thickness and increasing its width until it obtains a 7-lunge that adapts as completely as possible to the shape of the molding hole mold.

c, Pre-material generated by step b (pr6-eb
au-che) is rolled in a classic forming hole mold until a blank is obtained.

According to the invention, by a suitable combination of the inclination angle of the surface of the forming hole die and the correction values imposed by the rotary hole die and the edger unit, it is possible to obtain a preform of the required dimensions for each section. It is possible to obtain the shape of

The present invention will be explained below with reference to the drawings.

In FIG. 1, a rectangular section 10 of an ingot is shown in dotted lines with a thickness sufficient to ensure accurate filling of the forming holes sll in the classical method of blank rolling for wide 7-lange engineering sections. Ta.

FIG. 3 is a view showing the end of the material obtained after rolling the rectangular shape 10 of thickness H in the forming hole die 11 of FIG. 1. The difference in elongation between the web and the 7-lunge creates a rolled tongue and its length! .

is considered as material loss. Additionally, if the thickness of the rectangular section is dense, the scaling D may require truncating the ends in a typical stand rolling process. .

FIG. 8 is a diagram showing a surface rolling method using a slab 80 as a starting material. Etsuya single hole type is bax < b
As < bas, the width increases. The width of the 7-lunge bss of the front blank 88 must be sufficient to ensure the filling of the forming hole mold 81s.

FIG. 4 shows the end of the material obtained using a slab as the starting material. During compaction, the elongation of the rolled ends 41 and 42 is more important than the elongation of the central portion 48 (see Figure 3). The elongation of the web due to the forming hole mold is greater than the elongation of the 7-lunge and cancels out, resulting in the length of the rolling tongue of the material! , is shorter than that obtained by the classical method using (imbo). The loss of material is also significantly reduced.However, simply compressing the growing width with an edger single-hole mold does not allow the 7-lunge of the previous material to form into the correct shape. In fact, compressing the slab either to the initial height ho or to the final height hn yields a seven-lunge shape that depends in effect on the rate of reduction (ΣΔh) imposed during compaction. l&height after h
Since the realization of n and the final width bn of the 7° flange is governed by the initial height gho of the slab, no degree of freedom is provided to be able to control the shape of the 7° flange during compression.

An example of the disadvantageous results obtained by simple compaction of a slab with a rotary hole die is shown in FIG. Even though seven lunges of sufficient width are obtained for the front material 51, there is an underfilling portion 58 that cannot be removed during rolling using the forming hole die 5B.

Similarly, under constant compression conditions, a rather thick 7-lunge is obtained which causes the formation of spring flaws, resulting in an insufficient 7-lunge width of the material.

Taking these into consideration, the shape and thickness of the seven langes of the front material cannot be controlled by simply compressing the slab width.

The method according to the invention reduces the number of holes required while still ensuring accurate compaction of the forming holes.
The aim is to induce additional degrees of freedom in which the shape and thickness of the lunges can be controlled.

A schematic diagram of the method of the present invention is shown in FIG. The steps of this method are as follows.

a. “Mushroom” 6! Rotate the slab 60 until you get the hole! ! 161.

b. The front material 68 whose contour fits into the forming hole mold as completely as possible due to the "mushroom" deformation by the single edger.
form.

Material 6 is obtained by rolling the pre-C0 material 68 in a classical forming hole mold.
Get 4.

In FIG. 7, the formation of a pre-material from mushrooms realized in the first hole mold is shown. Rolling with a single edger produces the following phenomena.

a. Decrease in the thickness of the “mushroom” Δeeo1-e.

b1 width spread ΔbO-b, -b.

and Δb, , b, -b.

c. Removal of the slope of the mushroom ＼ limα1■O r−+rtot, and further Δhr−] (reduction) Therefore, the principle of the method of the present invention is that when the mushroom is compressed by one part of the edger 1 , the width lies in the difference in spread between the bottom of bl and the width of the head of bo.

By appropriately selecting the inclination angle α1 of the slope of the “mushroom”, it is possible to obtain seven lunges of the front material of an appropriate size.

7 langes 81° 82 and 8 of various shapes of the front material obtained by changing the value of the inclination angle of the first hole shape.
8 is shown. The shape of the 7-lunge 81 was realized from a mushroom with an angle of inclination equal to 10 whispers and a thickness equal to 0.198 m. The number of passes achieved by the single-hole Ezija and the single-machine Ezija were 8 and 17, respectively. 7 lunge 82
To obtain the shape of , the slope angle and thickness of the mushroom are each 5
0% and 0.11048 II. The number of passes by hole shape and platform were 11 and 9, respectively. 7 lunge 8
Shape B has an inclination angle equal to 80° and 0.1147 m
Realized from mushrooms with a thickness equal to . Hole mold and stand B
&: The number of passes was 15 and 6, respectively.

FIG. 9 shows the possibilities offered by the method of the invention in controlling the seven-lung thickness of the preform. two 7s
Lunges 91 and 98 are obtained starting from a slab with a height of 1.8 m and a thickness of 0.8 m. The mushroom had a slope angle equal to 50%. 7 Lange 91 received 9 passes by Etsugia one-hole type and 11 passes by smooth table part, and at that time, 7 Lange 9th received 6 passes by Etsugia one-hole type and 14 passes by smooth table part. It is noteworthy that the thickness of the 7-lunge was determined in effect by the thickness of the "mushroom" produced by the Edger one-hole mold.

FIG. 10 shows the dimensions g! which must be taken into account in the method of the invention. The section was shown. The first slab 101 has a height ho and a thickness. It is. After passing through the edger hole, the front blank 102 has a height hl and a reduction in height Δh0. The mushroom thickness corresponds to eo and the inclination angle corresponds to α. The minimum and maximum width of the mushroom (WA section and IE section) are respectively. and bl. After passing through the smooth table section, the 2 h high front material 10B further decreased in height by Δh. Front material 1
The 7 ranges of 0g indicate the minimum and maximum widths corresponding to , , and , respectively. 7 The thickness of the flange corresponds to e, and the inclination angle corresponds to α.

After rolling the blank to the appropriate dimensions, the deformation is calculated as a function of the imposed conditions.

FIG. 11 shows that for various heights ho of the initial slab,
It shows the broadening of the base of the ``mushroom'' due to the imposed decreasing function. For @ angle α□ where the inclination angle of the "mushroom" is maintained at 50%, the width of the bottom of the "mushroom" is expressed by the relational expression shown in the table of contents.

The coefficients a0 and a are functions of the initial width h0 of the slab,
It is expressed by the following formula.

JLt -01+ dl・ho(2i)a, +1g
O, + rim ・h6 (8) For a given initial width and angle α, the relational expressions (1), (2) and (8
), one can determine the mushroom base -b1 for a given absolute subtraction Δh0.

The thickness of the "mushroom" is proportional to -b0, and is expressed by the following relational expression.

Δb1 praise, -bo(5) Here, the average width of the "mushroom" can be defined.

b + l) bml--T-(6) Similarly, the average width of the 7 lunges of the front material can be defined.

FIG. 12 shows the variation of the average width of the front material with the reduction function imposed on the edger section for a "mushroom" inclination angle equal to 50%. This change is expressed by the following relational expression.

The coefficient a8 is a linear function of the height ho of the slab exiting the edger single-hole die, and is expressed by the following relational expression.

as a-0@+ds・hx (8) FIG. 18 shows the decrease in the thickness of the "mushroom" in the decreasing function due to one edger. The inclination angle α of the first “mushroom” was 5θ%. Approximately, a reduction in thickness of 12% can be observed for an angle α of −50%.

FIG. 14 shows the reduction per pass of the inclination angle α in the initial thickness function of the mushroom during compression of one part of the edger. The angle α corresponded to 5o%.

The ridge coefficients related to relational expressions (1) to (9) were determined experimentally for the angle α□ of the ridge value. The main variables of the method can now be determined from the dimensions of the desired material.

FIG. 15 shows sd and Q (thickness of the web), be and bp (
7-lunge width), e8 and 6p (7-lunge thickness) and ri. and showed the main variable of (height).

From the dimensions of the material, the dimensions of the previous material can be determined using the following relational expression.

ep-6, (10) h, -hp-h8-(20,8Qss+) (11
) bm, 1111 bp-sp+ (b, -s,)
(tg) As the first hole type objective, the fusion thickness eo is expressed by the relational expression (9).

FIG. 16 shows a 7g-chart of the calculations leading to the measurement of the key variables of the method of the invention. This # calculation is advantageously performed by a mesh calculator.

Using the method of the invention, starting from a slab with dimensions B x 0.8 m", it is possible to roll sections up to a web height of 1 m and a width of 7 flanges of OJ g 5 m. .

Compression of large width slabs by a single edger can cause undesirable phenomena. In order to ensure sufficient stability of the slab, a forming part of the rolls is provided in the center of the edger part, which ensures the guidance of the slab during rolling.

FIG. 17 shows the edger one-hole type 171 and the compression table part 17.
The molding of this turret for 2 was shown. Guidance (D:) A/Bang (OOntre-patins) (1
78 and 174), the slab can be compressed and removed by a single edger section constituted by a classic formed-hole type web.

The single edger section can be replaced with a rotary hole mold that includes molding of the hole bottom. In this case, the recesses of the rotary hole mold ensure lateral guidance in the engagement of the slab during the final pass of compression.

In a first variant of the method, vertical rolls for rolling the stock are used instead of the compaction mold or platform used for the formation of the "mushroom".

In this case, rolling of the blank was carried out as shown in FIG. 18.19.20.

FIG. 18 shows the process of compressing a slab of height ho and thickness eb to form a "mushroom". The horizontal roll includes a groove 181 used for the formation of the "mushroom" and a second groove 182 whose outline corresponds to the chamber formed by the web of material 188 indicated in dotted lines and the inner surface of the seven flange.

The width l of this hole is at least equal to the height ho of the slag exiting the hole 181. The depth V of the recessed part of this hole pattern corresponds to the width of half the seven langes of the material measured from its edge to the web.

FIG. 19 shows the following deformation of the slab obtained during the previous stage. The width reduction is achieved by driven vertical rolls 191 arranged similarly as in a common slab pressure if1m stand or in a separate stand. 20th
Cut the final width of the material as shown in the figure. I compressed it until I got it and spread it across the width.

During compaction by the vertical rolls, the horizontal rolls have a guiding function and the web is not subjected to any pressure by rolling, or is only subjected to a small pressure.

The previous material is then coated with the final layer, as shown in Figure g1.
The web thickness was reduced to 0 and rolled to the final blank stage. During the reduction of the thickness of this web, the vertical rolls were maintained at fixed points and at a spacing corresponding to the width of the material. During each pass, the sides of the seven lunges were similarly compressed by vertical rolls.

The advantage of this modification is that the compaction pass with the web in a vertical position can be eliminated, as is the case during rolling with the classic forming hole type.

As a result, productivity increases.

Another advantage compared to classic mold-hole rolling is that better blank edge shapes are obtained. In fact, during rolling through the molding die, the shape of the edges of the precursor blank creates "ears" at the edges where there is no web by selective elongation during compression.

Fig. 21 shows a front material 220 with a thickness eb, and Fig. 1B shows a material gB2 with a thickness e smaller than eH. [Ear J
il1gl originates from the overlap localized to the incorrect path of the forming hole type, which occurs due to the absence of the web at this location. This phenomenon makes engagement by compression difficult. To reduce this, additional compression passes need to be performed.

Before continuing rolling with a typical rolling stand, the excess portion of the material ends must be cut off, resulting in a loss of production. This phenomenon does not occur when rolling with vertically driven rolls as described above.

A second variant of the process according to the invention likewise consists in carrying out the first stage process, ie the formation of the "mushroom" between vertical rolls. In this case, as shown in Figure B8, the first
The edger hole is placed on a vertical roll 281 to compress the slab in a horizontal position.

In order to carry out the next step, namely the deformation of the mushroom leading to the formation of the 7 lunges, the 24th v! Compact the slab with the smooth section of a vertical roll as shown in J.

Also, this stage and this G1: The following stage is the previous first stage.
This is the same as the steps (FIGS. 19 to 81) corresponding to the modified example.

It is necessary to move the vertical rolls along the vertical axis so that the vertical rolls can carry out the compaction by means of the groove and the flatbed. Second modification of the method of the present invention (first modification)
In Figure 18.24), the rolls of a horizontal rolling stand can be removed at the limit of the width of the slab placed at its highest position, and the available slab width is determined by the maximum spacing between the vertical rolls. .

Similarly, the principles of the method according to the invention can be applied to other forming parts, such as 2- or U-shaped inertial sheets/toils, flat sheath piles pulled with hook traction, and rolling of U-profiles with 7 parallel rungs. can do.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a rectangular shaped material lO with a thickness H and a forming hole die 11, Fig. 2 is a diagram showing the end of the material after rolling, and Fig. 8 is a diagram showing a continuous rolling method using a slab 80. , Figure 4 is a diagram showing the end of the material obtained using a slab, Figure 6 is a diagram showing simple compression of the slab using a rotary hole mold, Figure 6 is a copy of the method of the present invention, Figure 7 is a diagram showing the formation of the front material from the "mushroom" realized with the first hole mold, and Figure 8 is a diagram showing the formation of the front material from the "mushroom" realized with the first hole mold. The 9th side is a diagram showing the formation of 7 lunges by the method of the present invention. Figure 10 is the main part of the dimensions considered in the method of the present invention. Figure 14 is a diagram showing the relationship between eo and Δα. Fig. 15 is a diagram showing the main variables of the material 150 and the previous material IF11, Fig. 16 is a flowchart of calculations leading to the measurement of the main variables of the method of the present invention, JP17 Fig. G: J edger single hole mold 171 and compression table part 192, FIG. 18 to FIG. 20 are diagrams showing the first modified example of the method of the present invention, FIG. 21 is a diagram showing roughly compressing the thickness of the web, and FIG. 22 is a diagram showing the thickness eb. front material g20, and fif of thickness e;I
222tt and 2deg4 are diagrams showing a second modification of the present invention. lO... Rectangular shape of ingot, 1, 1... Molding hole @ 80... Slab 88.
・・Front material 86・・Molding hole mold 41.41・
・Rolled end portion 48 ・Center portion 51 ・Front material 62 ・
...Molding hole mold 58...Insufficient filling part 60...
Slab 61...Rotating hole type aSl..."Mushroom" 68...Front material 84...Material 81.82.88...7 lunges of various shapes of front material 9
1.99...7 lunges 101-0. first slab l
og, 108...ftl material 150...material 151...previous material 171
... Edger single hole mold 17 m ... Compression table part 17 δ, 174 ... Guide portion 181 ... First hole mold 182 ... Second hole mold 1
819...Material 191...Drive type -° roll 220...Front material with thickness eb 221..."Ear J 221!...Material with thickness e 281...Vertical roll e permission ff111 Person Albet Société Anonyme F/'G, 23 rjcy, 24 Procedural Amendment July 12, 1981 1. Indication of the case 1982 Patent Application No. 61207 2. Name of invention Material for manufacturing large shaped steel Wang Yan method 3, the person making the amendment and the related patent applicant

Claims (1)

[Claims] L A slab of acid rectangular material is used as the starting material, and this slab is compressed in a rotary hole mold so that the width of the bottom is smaller than the thickness of the slab used and the sides are a function of the dimensions of the material. The angle α
, and the thickness of the obtained "mushroom" is about 12% larger than the thickness of the seven lunges of the material. . Tortoise compresses the previous material, and the total reduction imposed is such that the width of the head and base of the "mushroom" becomes almost equal with the disapproximation of the angle α, at the end of the compression, to the thickness of the 7-lunge of the material. 2. A method as claimed in claim 1, characterized in that the widening is effected to obtain a coincident 7-lunge thickness. & The compression according to claim 2 is carried out by means of a one-piece Etsujia or a single-hole Etsujia, the width of which is at least the seven-lung width of the material increasing the difference between the thickness of the slab and the thickness of the material. A method according to claim 1 or 2 for achieving the same rolling method according to claim 2 or 8 by performing rolling using a classic forming hole type. When completed, the average width of the seven lunges of the material obtained according to claim 2 or claim 8 is approximately equal to the thickness of the slab, increasing the difference between the seven lunges of the material and the thickness of the web. Any one of the ranges 1 to 8 of the special FF an
The method described in section. 5 Place a control button (Co
ntre-patins) (Foreseeing the existence of D, the control pattern of cholera is regenerated by the next edger one part or machining hole one-hole mold to ensure the guidance of the slab, and formed by the web of the forming hole mold. The ranges 1 to 1 are compressed by a smooth base or, if the convergence of the roll base allows it, in a flat-bottom rotary hole mold. The method described in any one of Items 1 to 4 of Item 4. a. The method described in any one of Items 1 to 5 of the special t'FM requirement range in which the rolling is carried out using horizontal rolls. Compression rolling is performed, the arrangement of which is similar to the stand arrangement of a general slab rolling mill, and the vertical rolls are placed as close as possible to the stands of the horizontal rolls and arranged in shaded stands. The method according to any one of claims 1 to 6. The method according to claim 1, in which copper coins are made of elti material using vertical rolls. 1.7.8.