JPS6044101A - Rolling method for U-shaped steel sheet piles - 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] (Industrial Application Field) The invention relates to a method for rolling U-shaped sheet piles, and more specifically, a method for rolling a U-shaped sheet pile, and more specifically, a method for rolling a wafer and a flange by rolling the bales back and forth in the same hole. This invention relates to a method of configuring a hole shape that makes it possible to maintain balance.

(Prior art) U-type ttil sheet piles have traditionally been manufactured using several double or triple rolling mills consisting of top and bottom rolls with roll rolls/knees. However, there were many problems with yield and roll consumption.

After that, the method of rolling steel sheet piles detailed in Japanese Patent Publication No. 47-47784, that is, a pair of Cornino ζ-Sal mill or universal mill and Eson Ing mill, was developed as an economical method of rolling steel sheet piles with excellent quality. A manufacturing method has also been adopted in which the so-called uni/mealsal rolling method used in the above-mentioned method is applied to rolling steel sheet piles, thereby significantly improving the drawbacks mentioned in mJ.

A specific example in which this universal pressure treatment method is applied to the production of U-shaped pressing sheet piles is shown in FIG. 1, as well as in FIGS. 2 and 3. Figure 1 is a concrete implementation 1t71i+/)I6 diagram, and shows a universal mill (H-shaped 11-1) for pressing H-shaped steel, which is the main product in the In the rough rolling process shown in Figs. 2 and 3, which shows an example of application to a general process as a section steel manufacturing equipment equipped with two rivet-type rolling barrels (one holder) during steel manufacturing, In addition, in the pair of universal mill U and edger mill E in the intermediate process in Fig. 2,
Rolling and shaping is performed several times within the same caliber.

As shown in Figures 2 and 3, in order to obtain the final product of U-shaped steel sheet piles, the valley rolls of each rolling mill B, D (rough rolling process), Ml and U-E (intermediate rolling process) are Necessary roll holes are arranged within the body length, and the number of passes is distributed for each valley rolled plate.The number of holes for each roll of each rolling mill is within the constraints of the roll body length. and one-hole type 1
The stretching (or - cross-sectional reduction rate) per pass is set at a value that takes into consideration shape formability, rolling power requirements, rolling accessories, roll strength, etc., and the cross-section of the mill used is adjusted to the required product cross-section. By total stretching (or total cross-sectional reduction rate), which is necessary for reduction,
The total number of passes is determined.

In the case of U-shaped steel sheet piles, the distance between i and e1 of the product is shown in Figure 4 (a).
, As shown in (b) 1-, it is symmetrical on the left and right with respect to the axis Y-Y, but with respect to the axis X-X, it is downwardly asymmetrical,
And the flange f has complicated +1. It has a ui hand part G. Furthermore, as is well known, a more economical shape is required to increase the cross-sectional efficiency (section modulus/sectional area J) product/unit width), so the thickness tf of the flange f is −j, and the product width W is usually 400 r.
Cut a wide width of mπ or more.

For this reason, when manufacturing U-shaped steel sheet piles by rolling, careful attention must be paid to roll design technology and rolling urinalysis technology. However, in order to manufacture U sacred ground sheet piles more economically and efficiently, it is necessary to use continuous casting copper pieces, which are advantageous in terms of manufacturing cost, for the piles, and to use small quantities of ψ type blanks. ti41] was added to the cast slab (1). ]j? Use.

■In order to obtain a good yield, ensure maximum filling and length within the 1N2 construction process 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.

(1) Appropriate number of passes and stretching distribution are carried out to ensure stable rolling operation with less wear and tear on the rolls under warm conditions of the material to be rolled.

It is necessary to satisfy the following. To achieve this, constraints on rolling equipment, such as the number of rolling mills, the arrangement similar to valley rolling, the roll body length, the allowable rolling weight of 461 in the valley rolling mill, the strength of the rolling force, and the increase in the roll strength limit, etc., must be established for rolling. When determining the required number of grooves and number of passes, it becomes necessary to perform multiple passes (reciprocating) rolling within the same groove.

The method of rolling by reciprocating within the same hole multiple times is, as is well known, the blooming process, or the rough rolling process CB, D) in Figures 2 and 3, as shown in the "?1" specific example. It is adopted in the rough forming hole mold.

In this case, the rolling stock of the rolled material is high, and the hole/mold cross section is thick (because of the simple shape, metal flow (plastic flow) of the rolled material within the roll hole mold is easy; Furthermore, even if there is a slight variation in the hot cross section or dimensions of the rolled milled material, it will be completely corrected in the subsequent process, from the intermediate rolling process to the finishing rolling process, and the quality of the final product (shape, size, flaws, etc.) will be completely corrected. will not cause any problems.

In the case of U-shaped steel sheet piles, the finish rolling process aims at distortion and shaping mainly through bending deformation to form the joint group G, so multiple reciprocating rolling in the same hole is impossible. ,
It is a 1-hole type 1·ξ space.

Therefore, when rolling U-shaped steel sheet piles, it is necessary to consolidate the cross-section of the material used, improve yield and efficiency, and increase the rolling load (
Rolling i'+! As a measure for producing wide sheet piles that increase the number of rolling cans, the appropriate number of holes and the number of passes and number of passes should be distributed for each rolling can in a limited number of rolling machines. , and for proper load distribution,
) However, in the intermediate rolling process, it is necessary to adopt a method of rolling the same hole by reciprocating it multiple times.

When rolling U-shaped steel sheet piles, when the same groove is reciprocated multiple times in the intermediate rolling process, the groove cross section has a cross-sectional distribution close to the product shape and a wall thickness, compared to the groove cross section in the rough rolling process. The metal flow (plastic flow) of the rolled material is difficult in the roll hole mold, and the heat of the rolled material is also reduced. If a variation occurs in the cross-sectional dimensions, it will not be corrected in the subsequent process (finish rolling process), resulting in poor quality (shape, dimensions, flaws, etc.) of the final product.

In other words, the hole shape of the intermediate pressure stopper process corresponds to the product cross section shown in Figures 4 (A) and (B), and an example is shown in Figure 51 (I) and (B) (the right half is omitted). ), the cross-sectional area of the web W and the flange f, which are symmetrical cross-sections and shaded areas, occupies more than 80 parts of the entire cross-sectional area, and the cross-sectional area of the web W and the flange f are symmetrical in cross-section. In the case of rolling, the stretching balance between the web W and the flange f must be maintained.

10 in the figure. Lower horizontal roll, 11. lower horizontal roll, 12,
Indicates vertical roll.

However, when rolling is performed by reciprocating multiple times in the complex asymmetrically shaped groove in the intermediate rolling process as shown in Fig. 5, it is necessary to fully satisfy the appropriate stretching balance conditions between the web and flange of the rolled plate material. Because it is difficult to do so, the rolled state becomes unstable (bent or wavy rolled material).
There were some points where the dimensions of the joint G changed, the work rate decreased, and even poor power caused by deformation energy loss started to ignite.

(Object of the Invention) The present invention solves the above-mentioned drawbacks. It was developed to provide a method for economically producing high-quality (shape, dimensions, and flaws) U-shaped steel sheet piles in a well-defined rolling process using a rational shaping process. be.

(Structure and operation of the invention) That is, the present invention mainly uses a reverse rolling mill, a 2M type rolling mill, or a universal rolling mill in which the roll reduction is variable for each step, mainly in the middle rolling shaping stage. ) are used in combination or in combination to form a groove with appropriate conditions for balancing flange stretching and web stretching, and rolling is performed by passing the rolled material back and forth multiple times within the same roll groove. It is characterized by

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

Figure 6 shows the rolling state of a U-shaped copper sheet pile consisting of two claws at the joint when the method is carried out in the rolling process shown in Figure 1; The figure similarly shows the rolling state of a U-shaped steel sheet pile consisting of one claw at the joint.

In the BD mill in the 1-rough rolling process shown in Fig. 1, one roll hole W (Kal-
8, Kal-9, Kal-10) and the roll hole type shown in FIGS. 7 and 8 (Kal-9, Kal-10, Kal-10)
-11) is arranged, and the rice bloom leaf material m sent from the previous mill is roughly rolled and shaped, and then transferred to the next intermediate rolling process.

Subsequently, in the M1 mill of the first step of intermediate rolling shown in FIG.
-6) and the roll hole type (Kal
-8, Kal-7, Kal-6) are arranged, and are sent from the rough rolling process to perform intermediate rolling shaping (first stage) of the rice plate rolled material. In this step, Kpl-7 shown in (a) in FIG. 6 is an example of roll hole pattern arrangement to which the method of the present invention is applied.

Next, in the U-E mill of the 1-intermediate rolling second step shown in FIG. Pore type (Ka 1-
5, Kal-4) is also an example of roll hole arrangement to which the method of the present invention is applied, and performs intermediate rolling shaping (second stage) of the rolled material layered in the first intermediate rolling step.

Finally, 1.1 or Fl, F of the seven pressing process shown in Figure 1.
2. In the F3 mill, the same as the conventional method (, roll hole type (Kal-3, Ka
1-2, f(al-1) is used to perform rolling shaping, resulting in the completed shape and dimensions of the U-shaped steel sheet pile.

In the above process, during the intermediate rolling of U-shaped copper sheet piles, a reversible rolling mill M1 with variable roll reduction for each pass or a U-
An example of the roll hole shape to which the method of the present invention can be applied is shown when two machines of E are used in combination, but the purpose of the present invention was originally to pass the rolled material multiple times in the same roll hole shape. , and is a construction method of the roll hole type that makes it possible to provide appropriate conditions in which the elongation of the web and the flange are balanced when applying rolling reduction for each thread, and will be explained in detail using FIG. Figure 9 shows the roll hole shapes (A), (B), and (C) to which the present invention described above is applied in the intermediate rolling process of U-shaped copper arrows.
This is a schematic diagram showing the hole forming portions of the web W and flange f (the right half is omitted), which occupies more than 80% of the cross-sectional area of the total curved area of each roll hole. This is for specifically explaining the basic principle of the invention.

In FIG. 9, the number 11M necessary for calculating the method of the roll hole type structure according to the present invention is shown as a symbol, and first, its definition and the definitions of other symbols for setting calculations yet to be determined will be explained.

λW Web thickness extension λf, flange thickness extension Bw Web center width Bfl, Sf2 Flange center width Sw, web cross-sectional area Sf, flange cross-sectional area tw, web thickness tf Flange j thickness (flange thickness) When changing in the width direction, Δtw: Reduction amount Δtf in the web thickness direction during forward rolling in the same hole, in the flange thickness direction during pre-rolling in the same hole. Reduction amount c-c: Vertical center line of roll hole type Half-dangerous X angle anti-θf
: Angle θ between the flange center line and the vertical 111u cliff y3':
Angle H1 between web center line and flange center line Vertical roll displacement amount α during reciprocating rolling in the same hole mold: Flange to web stretching ratio, flange to web thickness ratio tf/tw, cross-sectional area ratio Sf/Sw , width ratio (
A constant determined by Sf/lf)/(Sw/1w),
The stretching of the flange and web is in the range of 096 to 1.08.The conditions for balancing the stretching of the web and fludge are λf-α・λW
・・・・・・・・・(3) fil, (2) and (3
) According to the equation, if the stretching of the web is first determined and one shift of Δtw is set, the amount of reduction Δtf of the flange becomes the value of the following equation.

Here, the amount of reduction Δtw of the web and the angle of inclination θw formed by
0'), the vertical roll displacement amount 11 is determined.

Similarly, the reduction amount Δtf of the flange and the vertical axis y of the flange with respect to the roll axis, the slope of -y - the inclination angle θ
The vertical roll length H is determined from the relationship f. That is, H-ΔtW/CO5θWH H=Δtf/sinθf The value of this vertical roll displacement H is naturally the same value in all parts of the groove formed in the same roll. Therefore, the following relational expression holds.

From equations (4) and (5), the values of the symbols on the right side of equation (6) are known numerical values that can be determined at the time of designing the roll hole mold, and are constants.

Also, the angle θ between the web and the flange is a value determined from the relationship with the previous hole shape of the applicable hole when designing the roll hole, and the relationship between θW and θf is as follows: .

θf−θw+(θ−90°) ・ ・ ・ (8) (6
), (7) and (8) The above equations (7), (8) and (9) provide the conditions under which the stretching of the web and flange, which is the object of the present invention, is balanced in terms of class 111j. The basic configuration of the roll hole type with the following is determined.

EXAMPLE As an example in which the present invention was applied to an actual rolling process and the purpose of the present invention was confirmed, a roll maintaining the stretching balance of the web and the flange in the roll hole shape of the portion corresponding to Ka 1-5 of Fig. 7-θ was used. A specific example of the method for determining the l'r'j formation (Basics of hole shape) is shown below.

Ka 1- where forward rolling is performed three times in the same hole mold.
5, 3rd pass web ゛4tw, flange I'1-tf
, the angle 1y) θ between the web and the flange, and the valley value of the stretching ratio α between the flange and the web are determined by first designing Ka l-1 in the finish rolling process based on the cross section and dimensions of the finished product in manufacturing 1-1, and then sequentially Ka 1-2, Kal-3, Ka 1. -4 and then determined.

In the case of this embodiment, the d-hole hole 1i of the third pass of Kal-5
The initial setting values that are essential for determining the 1 configuration are tw-18, Om
m, tf-11,1nrm, θ288°, α=102
Met.

Next, the method that designed Ka l-1 to Ka l-4 is j-
Similarly, first, the value of the reduction amount Δtw of the roller web for the 3/ξth pass of Kal-5 (difference between the web thickness of the 2)ξth pass of Kal-5 and the web thickness of the third pass) is determined first. In this case, the value of the web reduction amount is the load (rolling pressure,
An appropriate value is determined in consideration of the rolling power, roll strength, etc., and the load distribution for the total and ξ spaces when the full-hole type is suitable. In the case of this example:
) Here, from equation (7), from equation (9), θW''35.9° From equation (8), θf = 35.9° + (88° - 90°) = 33.9° (
From formula 5), the amount of reduction of the flange from the second pass to the third pass of Ka l-5 is determined in this way: First, determine the I configuration of the web and flange, which is important for the roll hole type and circular case. After that, the shape of the other joint parts is constructed, and the shape of the hole is completed.

(Effects of the Invention) As explained above, in the method for rolling U comic sheet piles according to the present invention, when rolling the material to be rolled multiple times in the same roll hole mainly in the intermediate rolling shaping process, flange stretching is performed. The roll hole configuration method, which has the conditions to maintain a proper balance between web stretching and web stretching, is used to centralize the cross-section of the material used in the production of a wide variety of shaped copper in small quantities, and to maximize the yield of milliliter.
In order to improve production efficiency and manufacture wide steel sheet piles that require a large rolling load, we have developed a more appropriate roll hole shape, distribution of the number of passes, and It is possible to distribute the load and obtain the effect of manufacturing U-shaped steel sheet piles economically and efficiently.

[Brief explanation of the drawings] Figures 1, 2, and 3 show a specific example of applying the universal rolling method to the production of U-shaped steel sheet piles. Figure 1 is a process diagram, and Figure 2 is a process diagram. An explanatory diagram of the pass schedule for an example of the valley roll hole type of a U-shaped steel sheet pile that has two claws at the joint. Figure 3 shows each roll hole of a U-shaped steel sheet pile that has one claw at the joint. The model example is an explanatory diagram of the pass schedule.
The schematic diagram of the shape, Figure 4 (b), shows 11 claws in the joint.
i) A schematic diagram of the product surface and shape of the U-shaped Among the rolling processes, the intermediate rolling process Q, , ) is a schematic diagram of the roll hole shape, and Figure 5 (b) is the rolling process for producing a U-shaped steel sheet pile consisting of one pawl at the joint. 6, 7 and 8 are explanatory diagrams of a one-pass schedule showing the parts of the roll groove to which the method of the present invention is applied; FIG. 9 is a schematic diagram for specifically explaining the roll-hole type milling force method according to the present invention. (Kal): Roll-hole type (B, D) Knife breakdown mill (IVil): A reversible rolling mill (U) with a roll reduction of 1" for the first intermediate rolling process, and a 2Hi universal mill for the second intermediate rolling process.
Rolling etc. ζ (E) also used as a mill, intermediate rolling rust, 2-process edger mill (F)
: Rolling mill for finishing rolling process W: Web f Flange G: Joint part tw Web thickness tf: Flange thickness No. 7 Fig. 2 <A) Y! Mouth (b) No. 51 $q closed

Claims (1)

[Claims] In the shape rolling process, which consists of a rough rolling process in which the rolled material is roughly shaped to form a beam blank, an intermediate rolling process in which the intermediate blade loe body is formed, and a finishing rolling process in which the rolled material is processed and shaped into a predetermined product shape and size, soil is Targeting the intermediate rolling process, a reversible rolling machine with variable roll reduction for each pass is used, using one or a series of rolling mills, and the roll hole shape is configured so that the balance between flange stretching and web stretching is maintained. A method for rolling U-shaped sheet piles, which is characterized by performing back-and-forth rolling multiple times in the same roll hole die.