JPS62101302A - Rolling method for shape steel - Google Patents

Abstract

PURPOSE:To produce a shape steel having high quality with a stable rolling operation by using two-dimensional roll rolling down means in the stage of producing the shape steel such as U steel sheet pile with rough rolling stages, intermediate rolling stages and finish rolling stages. CONSTITUTION:The bloom stock (m) sent from the previous stage is formed by rough rolling with roll calibers (Kal-8, 9, 10) in the same manner as in the conventional method in the stage of producing the shape steel such as U steel sheet pile by rolling the bloom stock (m) with the rough rolling stages B, D, intermediate rolling stages M1, UE and finishing stages F, F1-F3. The bloom stock is then transferred to the next intermediate rolling stage where the stock is formed intermediate rolling with the roll calibers Kal-7, -6 of the mill M1 of the 1st intermediate rolling stage; in succession, the stock is formed by the rear stage of intermediate rolling with the roll calibers Kal-4, 5 of the mill U.E of the 2nd intermediate rolling stage. The bloom is then subjected to finish rolling with the roll calibers Kal-3, 2, 1 in the finish rolling stages for F1-F2 by which the U steel sheet pile is finished to the final shape and size as the hot product.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for rolling a section steel, and more specifically, when rolling a section steel multiple times in the same hole, the stretching of each part in the fIIT plane is performed. The present invention relates to a method of constructing a roll hole type that makes it possible to maintain balance.

(Conventional technology) In the past, general steel sections such as U-shaped steel sheet piles (so-called H
For materials other than shaped steel and similar shaped steel, use Roll Caliber M.
However, there were many problems in terms of productivity, yield, and roll consumption. -General Among steels, U-shaped steel sheet piles are a typical steel section that has a large amount of raw material and is complex in cross-section, so all examples of U-shaped steel sheet piles will be explained below.

U-shaped steel sheet piles have been rolled using the so-called groove method using Kuni M, 1lf5 or triple rolls for many years.

After that, the method of rolling steel sheet piles detailed in Japanese Patent Publication No. 47-47784, that is, the so-called so-called rolling method using a universal mill or a pair of a universal mill and an Etsujifugu mill, was developed as an economical method for rolling steel sheet piles of excellent quality. A manufacturing method has also been adopted in which the universal rolling method is applied to the rolling of steel sheet piles, which greatly improves the above-mentioned drawbacks.

This universal rolling method is applied to the production of U-shaped steel sheet piles, and examples of FCX bodies are shown in FIGS. 4, 5, and 6. Fourth
The figure is a process diagram of a specific example, a5p, Unipart mill mill for rolling H-section steel, which is the main type of section steel (THQ is used as a 2X rolling mill when manufacturing sections other than H-section steel).
Application to general processes as section steel manufacturing equipment equipped with N
It shows. In addition to the rough rolling process shown in FIGS. 5 and 6,
Unipartil Mill U and Edger Mill E in the intermediate process shown in the figure
In the pair, repeat the pressure iA in the same caliber several times.
Modeling is done.

What is shown in Figures 5 and 6 (the highest IP of LJ-shaped steel sheet piles:
In order to obtain the product, each rolling mill B, D, (rough rolling process), Ml and CI-E (intermediate rolling process), F or F
1, F2, and F3 (finish rolling process), an inexpensive roll hole mold is arranged within each roll body length.

The number of times < 0 RJ4 times is distributed to each rolling sheet.

The number of holes for the rolls of the 6-rolling mill is arranged within the constraints of the roll body length, and the stretching (or vi
The cross-sectional reduction rate) is set to a value that takes into consideration the formability, rolling power and rolling load, roll strength, etc. The total stretching ( or total cross-sectional reduction ratio), the total number of passes is determined.

In the case of U-shaped steel sheet piles, the product cross section is No. 7 (A).

(As shown in l:9, it has a 5-right symmetrical shape with respect to the axis Y-Y, but is vertically asymmetrical with respect to the center Furthermore, as is well known, an economical shape is required to increase the cross-sectional efficiency (section modulus/cutting product/unit @Naotataku) of the product. The thickness tf of the product is small, and the product width W is usually 400 mm or more, wide r@kura/N.

For this reason, when manufacturing U-shaped copper sheet piles by rolling, a meticulous 8:t ratio is required in terms of roll design technology and rolling operation technology. However, in order to efficiently manufacture U-shaped steel sheet piles in a more efficient manner.

(L) Continuously cast pieces, which are advantageous in terms of production cost, are conveniently used for the wood used, and the pieces used for small-quantity, high-mix steel sections are the result of the size of the pieces, that is, the mold size of the steelmaking process. Adopt #r surface dimensions that take FJ into consideration.

■ In order to obtain a good yield, ensure maximum elongation and length within the equipment conditions and obtain a product of good quality.

■ In order to maximize efficiency, the number of passes for each stand is distributed appropriately without any imbalance.

■ Appropriate number of passes and stretching distribution are carried out to enable stable rolling production with little temperature drop of the material to be rolled and wear and tear of the rolls.

etc., it is necessary to satisfy the equation. To achieve this, we must consider the constraints of the rolling equipment, such as the number of rolling mills, the arrangement of each 1:E rolling shear, the body length of the rolls, the allowable rolling load and power of each rolling mill, and the roll limit, which are necessary for rolling. This is to determine the number of holes (m) and number of passes (b).

This creates the need for multiple passes (reciprocating) rolling within the same hole mold.

What is the method of rolling by reciprocating within the same hole several times?

As is well known, the 5-spoon blooming process or the specific example shown in the rough rolling process (B, D) in FIGS. 5 and 6.

It is adopted in the rough forming hole mold. in this case.

Since the rolling temperature of the rolled material is high and the cross-section of the groove is large and has a single-row shape, the metal 70- (plastic flow) of the rolled material is easy in the roll groove, and furthermore, the rolled material is easily rolled. Even if there are variations in the hot cross section and dimensions of the material,
It is completely corrected in the post-process, that is, from the intermediate rolling process to the finishing rolling process, and there is no problem with the quality (shape, size, flaws, etc.) of the final product.

In the case of U-shaped steel sheet piles, the purpose of the finish rolling process is shaping and shaping mainly through bending deformation to form joints G, so multiple reciprocating rolling in the same hole is impossible. , one hole type and one pass.

Therefore, when rolling U-shaped steel sheet piles, 15! In order to consolidate the cross section of the rope material, improve yield and efficiency, and further increase the rolling load (rolling load, rolling load, rolling sea bream), we are aiming to produce 9 steel sheet piles with a limited number of 11 g. Regarding the number of rolling mills, in order to distribute the appropriate number of grooves and number of passes to each rolling mill, and to distribute the load appropriately, the same groove is made to reciprocate multiple times not only in the rough rolling process but also in the intermediate rolling process. It is necessary to adopt a rolling method.

When rolling a U-shaped steel sheet pile, when the same hole is reciprocated multiple times in the intermediate 8Ea process, the hole cross section of -f: is close to the product shape, compared to the hole cross section of the rough 8E process. As the cross-sectional distribution and wall thickness are reduced, the temperature of the rolled material also decreases, making it difficult for the rolled material to undergo metal 70- (plastic flow) in the roll hole mold. If a change occurs in the hot cross-sectional dimensions of the rolled material, it will not be corrected in the subsequent process (finish rolling process), causing defects in the final product (shape, size, flaws, etc.).

In other words, the groove shape in the intermediate rolling process corresponds to the cross section of the product shown in FIG. As shown in k, the web W, which has a symmetrical cross-section of the upper and lower sides and is shown at the girth line, and the 7 langes f.
OIHr's score is 80 or more in the overall score, and Schiff,
When rolling by passing back and forth multiple times within the same roll hole,
The balance between this web W and the 7-lunge fCD must be maintained. 10 in the figure is J: Horizontal '-' s 11
d Lower 71K 'F crawl 12d! Show role.

However, in the case of rolling back and forth multiple times within a complex asymmetrically shaped groove in the intermediate rolling process as shown in Fig. 8, the balance condition of 4 positive stretching is established between the web of the material to be rolled and the 72/j. Since the inner fan is used to fully satisfy the requirements, the rolling condition may be unstable (curved or wavy rolled material).
There were drawbacks such as dimensional variations in the joint capital G, a decrease in work efficiency, and an increase in power consumption due to deformation energy loss in the dead VC.

As a countermeasure to this problem, there is a method described in H% Opening [Publication No. 60-44101]. This method has the advantage that it can be used by simply devising the pattern needles of the grooved roll without modifying the existing equipment. This has the disadvantage that the required lid for the curve r7 mourning process in the process becomes large.

(Problems to be Solved by the Invention) The present invention improves the above-mentioned drawbacks by using a two-dimensional roll rolling means, and produces high-quality U-shaped steel sheet piles (shape, dimensions, and flaws) through stable rolling operations. and similar general section steel economically, and provides a method for producing sections of various webs and 7 lange thicknesses with the same roll tool.

(Means for Solving the Problems) The gist of the present invention is to divide the roll in the roll axis direction within the groove area in contact with the material to be rolled, so that at least one roll can be freely displaced in the axial direction. Composed and rolled material @
By displacing the axially displaceable roll in the axial direction in accordance with the shape of each part of the right circle, the stretch ratio of the pressurized abrasive material and each part of the web is adjusted to the appropriate IIji. This is a method of rolling steel sections characterized by performing all reciprocating multiple passes rolling in the same hole type.

(effect) The method of the present invention will be explained below with reference to the drawings.

Section 9 rih In the rolling process shown in Fig. 4, when the method is carried out, U
The rolled state of a shaped steel sheet pile is shown, and FIGS. 10 and 11 similarly show the rolled state of a U-shaped steel sheet pile having a single pawl at the joint portion.

In the BD mill for the rough rolling process shown in Fig. 4, the conventional method and the roll hole type shown in Fig. 9 (Ka 8, Ka
9, Ka 10) and the roll hole type shown in Figures 410 and 11 (Kal--9*Ka 10°Ka4-11)
) is arranged, the rice plume material m sent from the previous process is roughly rolled and shaped, and then transferred to the first intermediate rolling process.

Subsequently, in the Ml mill for the first intermediate rolling step shown in FIG. 4, the roll hole type (Ka 7, Kal-
-6) and the roll hole type shown in Figures 1O and 111W (
KaL-8, Ka7, Ka4-6) are used to carry out all intermediate rolling shaping (pre-rolling) of the rolled material sent from the rough rolling process. In the stiffening process, in the 91st (
As shown in b), it-7 is an example of roll hole arrangement to which the method of the present invention is applied.

Next, in the U-E mill of the 42nd intermediate rolling process shown in FIG. 4, roll hole shapes (Kal--5
*KaZ-4) is also an example of the general roll hole arrangement of the method of the present invention, and all intermediate rolling shaping (second stage) of the rolled material shaped in the first intermediate rolling step is performed.

Finally, Fl or Fl in the finish rolling process shown in FIG.

P2. In the P3 mill, similar to the conventional method, the narrow roll hole type (KaL-3
, KaL-2, KaL-1), rolling shaping is performed to obtain the completed shape and dimensions as a hot-formed U-shaped steel sheet pile.

Among the above, in intermediate rolling forming of U-shaped steel sheet piles, when using a combination of two machines, Ml or U-F, which has a vertical and horizontal roll reduction of 9 changes per pass. 1. Applicable roll hole type for the method of the present invention? ! As shown above, the purpose of the present invention was originally to pass the rolled material back and forth several times in a roll hole die, and to roll the rolled material after each pass, so that the stretching of the web and seven lunges was Appropriate conditions for balance
This is a method of configuring a roll hole type reduction nozzle schedule with 9 lines, and will be explained in detail using a 1Ml sample.

Figure 1 shows the intermediate rolling process of U-shaped steel sheet piles.

9 to 11 to which the present invention is applied, 80% or more of the total cross-sectional area of the narrow roll hole type f'r), (rostrum t?j and ni) shown in FIGS. This is a schematic diagram showing the hole-shaped constituent portions of the web W and 7/F (the right half is omitted), and is intended to concretely explain the basic principle of the invention '4.

In Figure 1, the numerical values required to calculate the roll hole configuration used in the single-breasted method are shown as dC, and first, the definition of the symbols for setting the fixed bloom and other calculation conditions? explain.

tW: Queue/thickness of the exit of the rolled material in the roll hole type; tf: 7/th of the exit side of the rolled material in the roll hole type.
Thickness of the web (if the 7 lange thickness + changes in the width direction, the thickness of one stitch at the center of the 727 ji) ΔtW: Reduction amount in the web thickness direction during internal rolling in the same hole Δtf: During reciprocating rolling in the same hole 7 U/J Thickness Direction Reduction Amount λw:':) Nib Thickness Stretch λf, 7 Lunge Thickness Stretch α: Appropriate Stretch Ratio of 7 Lunge and Web, 7 U/N and Web Thickness Ratio/Cross-sectional Area Ratio/Iwao The footrest is usually in the range of 0.96 to 1.08 x-x, which is determined by the rolling conditions such as length ratio and skiing difference; Horizontal melting parallel to the roll axis yy: Vertical line UW perpendicular to the roll axis, web center Angle θf between rock and perpendicular my-y: 7
Angle θ between the lunge center line and the vertical line y-y: Angle θ between the web center line and the 72-inch center line = θW10f Δ5y-y: Displacement of the same roll in the perpendicular direction during reciprocating rolling in the same hole mold Δ5x -x: Amount of horizontal roll displacement during reciprocating rolling in the same hole mold In Fig. 1, upper horizontal rolls l and 2 are lower horizontal rolls 3
It is possible to set S motion in the y-y direction.

Moreover, the upper horizontal roll 1 shares a central axis with the upper horizontal roll 2 and moves by the same amount in the y-y direction, and also moves in the x-y direction by the same amount.
It is also movable relative to the x direction.

As Sennari for fixed movement in this x-x direction, JP-A-60-
There is a technique described in Publication No. 72603@i, etc.

The characteristics of σW, θf, etc. of the roll hole type are the durability of the roll.

It is determined by taking into account rolling characteristics such as processing and workability.

Web and 7 lunge extensions.

λw=l+--■ tw tf What are the conditions for the web and 7 lunge extension to be balanced in the threading process?

λf=αλW −　 ■、■、From formula 0, ゛First, determine the web's jU and λW.

When the value of web pressure 'l'-tJ tw is set, 7u/
The proper pressure of the filt(ha).

Δtf=100(α(1+-)10 □■The roll reduction amount in the vertical direction Δ5y-y is the angle θW between the center line of the web and the perpendicular line y-y to the roll axis.

Δ5y−y ””Δtw/sioθW
-■ Proper reduction amount Δtf of the 7 lunge, required relative lateral movement amount ΔS)'-)' of the horizontal roll l is the angle between the center line of the 7 lunge and the vertical line y-y to the roll axis is θf. from.

Δ5x-x=(Δ if-Δ5y-y・sin θf
)/ cos θf −■.

As described above, the vertical and horizontal rolling reduction setting conditions of the horizontal roll for the basic configuration of the roll hole type that has the conditions for balancing the web and the stretching of the 7 lunges, which is the objective of the present invention, are determined by formulas 1, 2, and 0. be done.

In addition, although a U-shaped steel sheet pile with a complicated cross section is taken as an example here, the present invention can also be applied to other similar general shaped steel, such as the tile shaped steel shown in No. 2 and the angle shaped steel shown in Figure 3. can also be applied. Also 1
In this example, the upper horizontal roll is used to roll down both vertically and horizontally.

- One roll may be operated under E pressure, and the other roll may be functionally separated, with only upper and lower pressure applied.

(Example) As an example in which the present invention was applied to an actual rolling process and the effects of the present invention were confirmed, the first O! Regarding the roll hole type of the portion corresponding to KaL -5 of 14.1-ri, a specific example of determining the basic gM of the drawn fishing alloy bed roll hole type of Queg and 727ji will be shown.

KaL to perform reciprocating pressure #; three times in the same hole mold
-5 3rd bus gluing nib thickness tw, 7 u/ji thickness tf.

The angle θ between the web and the 7 flange, and the stretching ratio α between the 7 flange and the web are determined by first designing KaL-1 in the finish rolling process based on the cross section and dimensions of the product to be manufactured.)
@Next, take into account the nib and 7 langes and the extension of the joint part, and the bending knife Loe for its pan shape.
-2, KaL -3, and Kat -4 were designed in this order, and then a decision was made.

In the case of this example, the initial values required for determining the roll hole type configuration for the third pass of KaL-5 are tw = 180 mm,
tf = 11.1 mm, (/ = 88°,
α=1.02.

Next, the method of designing up to Kal −1= KaL −4 j
As with @, the value of the web reduction amount Δtw for the 3/#th pass of KaA -5 (the difference between the web thickness of the second pass of KaL -5 and the web thickness of the 37th pass) is first determined. In this case, the value of the amount of reduction of the web is determined by considering the load (rolling pressure, rolling power, roll strength, etc.) and determining an appropriate value within the load distribution to all baths in the case of full-hole type top material. Ru.

As described above, tW, tf and &2 of the 3rd
．． Appropriate stretching ratio α for each of the 1st and 7th threads, web stretching λwf
Once set, Table 1 is obtained from the above equations Q, ■ and 0.

Table 1. Cutting schedule for 3-bus reciprocating rolling with the same hole type.
9 mm, 2nd pass 2. l Omm, 3rd bus 1.6
By moving 0 familiarity,! 7 eb thickness 3' J-O
mm.

Using a 7-lunge thickness of 20.7 myn (rolled material P of DKaL 6), it was possible to perform three-bus same-hole reciprocating rolling in a good rolling state.

As shown in Fig. 2, the opening MoS of the roll occurs at the apex corner corresponding to Δ5x-x. ,
There is no problem because direct pressure can be applied from the top and bottom using the KaL-4 two-segment/gun.

In this way, after determining the configuration of the nib and 72-nib, which are important as the framework of the roll hole type Ka 6 and KaL-5, the configuration of other joints etc. can be configured and added to the finished roll. An appropriate ratio pass schedule for the hole shape and horizontal roll 1.2 was obtained.

(Effects of the Invention) According to the present invention, it is possible to control the dimensions of each part within the cross section by two-dimensional adjustment in the up, down, left, and right directions, instead of the roll that was conventionally measured by a dimensional adjustment method. The thickness of the web consisting of the hole shape and the seven lunges can be set individually.

Therefore, it is possible to achieve an appropriate stretching balance between the seven-lunge stretching and web stretching of the material to be rolled, and perform multiple reciprocating passes using the same hole type.

Within the constraints of the limited number of compression machines and the length of the front and rear rBJ equipment, consolidation of cable materials t4RrfJ, longer product compression lengths, same efficiency, larger product shapes, and higher quality materials And the temperature during rolling f1iIJ control rolling method can be carried out effectively.

In addition, since it is possible to separate the production of products in the same roll by using the same roll, Kueb and 7 Lange are independent of each other. be able to respond efficiently.

[Brief explanation of drawings]

Figure 1 shows a gM of roll hole type used in the method of the present invention. A schematic diagram for explaining everything in detail. FIG. 2 is a diagram illustrating an example of application to the uninvented steel section. FIG. 3 is a diagram illustrating the application of vt+ to the angle iron of the invention. The fourth problem, FIG. 5, and FIG. 6 show a specific example of applying the universal rolling method to the production of U-shaped steel sheet piles, and FIG. 4 is the process diagram. Figure 6 is an explanatory diagram of the full pass schedule for each roll hole type of a U-shaped steel sheet pile consisting of a single joint. ll pass schedule explanatory diagram. Figure 7 (a) is a schematic diagram of the product cross-section and shape of a U-shaped steel sheet pile with two claws at the joint, and Figure 7 (b) rl: #4 steel sheet pile with one claw at the joint. A schematic diagram of the product cross section and shape of Sanru U-shaped steel sheet pile. Figure 8 (a) is a schematic diagram of the roll hole shape in the intermediate rolling process of the rolling process for manufacturing U-shaped steel sheet piles consisting of two claws at the joint, and the 81st middle is the claw at the joint The schematic diagram of the roll hole shape of the intermediate rolling process of the rolling process of manufacturing a U-shaped steel sheet pile composed of one steel sheet pile. FIGS. 9, 10, and 11 are explanatory diagrams of pass schedules showing the portions of the roll hole mold to which the method of the present invention is applied. Kal... Roll Ju1. B. Skin: Plaque Dakun mill, Ml: Reversible rolling mill with roll reduction for the first process of intermediate rolling, U: Universal mill for intermediate rolling and second process, also used as a 2Hj mill. pressure 1
tA*, E-... edger mill for intermediate rolling second process,
1, 2...Half roll on top 7, 3゛...bottom 71'C"F
roll. . Agent Patent attorney Masaaki Aki Sawa Gen and 2 others 7i'4 figure valve 6 items π7I2] WB diagram

Claims (1)

[Claims] (1) The roll is divided in the axial direction of the roll within the groove area that contacts the material to be rolled, and at least one of the rolls is configured to be freely displaceable in the axial direction. It is characterized by performing reciprocating multi-pass rolling in the same hole type by displacing a roll that is freely displaceable in the axial direction and adjusting the stretching ratio of each part of the flange and web of the material to be rolled to appropriate values. A method of rolling steel sections.