JP2005000934A - Method for manufacturing round corner flat square rolled material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a round corner R flat square rolled material as hot-rolled by the caliber-less flat square rolling by using a round bar stock in a small-amount and size-free manner. <P>SOLUTION: In the method for manufacturing the corner R flat square rolled material to provide roundness at the corners of a flat square rolled material, a round bar stock 2 is subjected to pass-rolling five times, i.e., a first horizontal rolling H1, a first vertical rolling V1, a second horizontal rolling H2, a second vertical rolling V2, and a third horizontal rolling H3 by using a caliber-less rolling mill 1, and a flat square rolled material 7 with a round corner R is manufactured thereby. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００２０】
表１に基づいて製品コーナＲと周長変化率（δ）との関係を図２に示す。
次に、コーナＲの平角圧延材を成形するに当たり丸棒素材のサイズ（外径）を決める場合について説明する。
先ず、図２のグラフから必要な製品コーナＲに対する周長変化率（δ）を求める。製品断面の外周長Ｌ２は、既知であり、丸棒素材断面の外周長Ｌ１は、Ｌ１＝δ×Ｌ２となり、従って、丸棒素材のサイズ（外径）Ｄは、Ｄ＝（δ×Ｌ２）／πとなる。これにより、必要な製品コーナＲから適正な丸棒素材のサイズ（外径）を決めることができる。
【００２１】
尚、丸棒素材２から製品コーナＲ平角圧延材７を製造する場合、熱間圧延により成形する場合について記述したが、冷間圧延により成形するようにしても良いことはいうまでもない。
また、上記実施例では、丸棒素材としてＳＵＳ３０４を使用した場合について記述したが、これに限るものではなく他の材質に対しても対応し得ることは勿論である。この場合、製品のコーナＲは、丸棒素材の材質に応じて変わるが、前述のような、周長変化率（δ）と製品のコーナＲとの間の一次の相関関係は維持される。
【００２２】
【発明の効果】
以上説明したように本発明によれば、小径丸棒素材を用いたカリバレス平角圧延により、熱間圧延そのままで製品コーナＲ平角圧延材を製造することができ、作業性の大幅な向上が図られると共に製造設備の簡素化が図られる。更に、少量で且つフリーサイズで製造が可能となり、また、製造コストも安価にすることができる。
【００２３】
請求項２の発明によれば、製品コーナＲに応じた適正サイズの丸棒素材を簡単に決定することが可能となり、作業性の向上が図られる。
【図面の簡単な説明】
【図１】本発明に係るコーナＲ平角圧延材の製造方法の製造工程を示す説明図である。
【図２】本発明に係る製造方法における製品コーナＲと周長変化率との関係を示すグラフである。
【符号の説明】
１ カリバレス平角圧延機
２ 丸棒素材
３ 第１の断面長円形圧延材
４ 第１の厚肉コーナＲ平角圧延材
５ 第２の断面長円形圧延材
６ 第２の薄肉コーナＲ平角圧延材
７ 製品コーナＲ平角圧延材
Ｈ１、Ｈ２、Ｈ３ 水平圧延工程
Ｖ１、Ｖ２ 垂直圧延工程[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a corner R flat rolled material in which R is provided at a corner of the flat rolled material.
[0002]
[Prior art]
Normally, the corner of the flat rolled material is perpendicular to the corner, but a flat rolled material with a rounded corner (hereinafter referred to as “corner R flat rolled material”) may be required. Here, the flat material refers to a material having a square cross section, that is, a rectangular shape or a square shape. As a manufacturing method of a corner R flat rolled material in which R is provided at a corner of a flat rolled material, a method of manufacturing by hot or cold rolling using a caliber with a corner R, a corner by drawing a flat rolled material without a corner R There is a method of imparting R and the like.
[0003]
Furthermore, a method of rolling and forming each corner of the rolled material in one pass with four perforated rolls having a radius R according to the corner R, a pair of upper and lower holes having an arc surface with a radius R in the vicinity of both end flange portions There is a method in which each corner portion of the rolled material is chamfered and rolled in one pass with a die roll (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 55-70401 (2nd page, 2nd, 3rd)
[0005]
[Problems to be solved by the invention]
However, when a corner R flat rolled material is produced by hot or cold rolling using a caliber with corner R, a dedicated caliber is required for each size, and it takes time to change the size, resulting in poor productivity. In addition, the manufacturable range is regulated by the number of dedicated calibers, and it is difficult to make a free size, and there is a problem that it is difficult to order a small amount of production because a dedicated caliber is necessary.
[0006]
In addition, the method of drawing corner-free flat rolled material and applying the corner R requires a rolling process and a drawing process, and thus the manufacturing cost is high. Since a dedicated die for drawing is required for each size, there is a problem that the manufacturing range is restricted and the order quantity is restricted.
In addition, the method of rolling and forming each corner of the rolled material in one pass with four perforated rolls having a radius R according to the corner R requires a dedicated device and the device is complicated, and the product In addition to the need for a perforated roll corresponding to each corner R, not only a large number of perforated rolls are required, but also the adjustment takes time and workability is poor.
[0007]
Further, in the method in which each corner portion of the rolled material is chamfered and rolled in one pass by a pair of upper and lower perforated rolls having a radius R corresponding to the corner R in the vicinity of both end flange portions, this occurs after chamfering rolling. There is a problem that the sagging remains as a fogging scratch in the next rolling process with a flat roll, and the appearance of the product is poor.
The present invention has been made in view of the above-mentioned points, and a corner R flat rolled material is manufactured by using a round bar material as it is by hot rolling by a cavalier flattened rolling, and can be manufactured in a small amount and in a size-free manner. It aims at providing the manufacturing method of R flat rolled material.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a method of manufacturing a corner R flat rolled material in which R is provided at the corner of the flat rolled material, wherein the round bar material is subjected to first horizontal rolling, 5 vertical rolling in the order of 1 vertical rolling, 2nd horizontal rolling, 2nd vertical rolling, and 3rd horizontal rolling, and a corner manufactures the flat rolled material of R. It is characterized by the above-mentioned.
[0009]
The round bar material is pressed from both the upper and lower sides in the first horizontal rolling process and rolled into an oblong rolled material having a horizontally long cross section, and then pressed from both the left and right sides in the first vertical rolling process to be formed into a flat rolled material. Is done. This flat rolled material is a thick corner R flat rolled material that leaves a part of the outer shape (arc) of the round bar material at each corner. The corner R flat rolled material receives a rolling load, and slightly bulges are generated in the vicinity of the upper and lower corners.
[0010]
The corner R flat rolled material is formed into an oblong rolled material having a predetermined plate thickness with a horizontally long cross section by being pressed down in both the upper and lower surfaces in the second horizontal rolling step. The thick corner R flat rolled material is squeezed on both the upper and lower surfaces in the second horizontal rolling step, so that both sides bulge outward and have an oval cross section. Further, the bulging portions on the upper and lower surfaces of the thick corner R flat rolled material are reduced to a flat surface in the second horizontal rolling step.
[0011]
The thin oval rolled material is formed into a corner R flat rolled material whose both sides are crushed in the second vertical rolling process, leaving a part of the arc of the thick oval rolled material in the corner. Next, in the third horizontal rolling step, the upper and lower surfaces of the thin corner R flat rolled material are lightly pressed to form a corner R flat rolled material (product) in which a predetermined R is left in the corner. In the final horizontal rolling process, the appearance is improved by forming the wide upper and lower surfaces of the corner R flat rolled material into a good flat surface.
[0012]
The invention of claim 2 is characterized in that, in claim 1, the size of the round bar material is determined on the basis of the ratio of the outer peripheral length of the cross section of the round bar raw material to the outer peripheral length of the cross section of the product.
The ratio (defined as the perimeter change rate) between the cross-sectional outer peripheral length L1 of the round bar material of various sizes (outer diameter) and the cross-sectional outer peripheral length L2 of the product corner R flat rolled material of various sizes is defined as δ. Correlation data between δ and the corner R of the product corner R flat rolled material is obtained. Next, the circumference change rate δ corresponding to the required product corner R is obtained from this data. The outer peripheral length L2 of the product cross section is known, the outer peripheral length L1 of the round bar material cross section is L2 × δ, and the size (outer diameter) of the round bar material is (δ × L2) / π. Thus, the appropriate round bar material size is determined from the necessary product corner R.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing a manufacturing process of a method for manufacturing a corner R flat rolled material according to the present invention. As shown in FIGS. 1 (a) to (f), the Caliberless flat rolling mill 1 includes a first horizontal rolling process H1 (b), a first vertical rolling process V1 (c), and a second horizontal rolling process H2 ( d) consists of a 5-pass rolling process, a second vertical rolling process V2 (e), and a third horizontal rolling process H3 (f). This caliperless flat rolling mill 1 produces a corner R flat rolled material from a round bar material 2 (a) as it is by hot rolling as it is in a 5-pass rolling process.
[0014]
The round bar material (base material) 2 is rolled from the upper and lower sides in the first horizontal rolling step H1 and rolled into a first oblong rolled material (sheet thickness t1, width w1) 3 having a horizontally long cross section. In the first vertical rolling step V 1, the first flat rolled material (sheet thickness t 2, width w 2) 4 is formed by being reduced from both the left and right sides. The first corner R flat rolled material 4 is a thick corner R flat rolled material in which a part (arc) of the outer shape of the round bar material 2 is left in each corner 4a. In addition, the first corner R flat rolled material 4 receives a rolling load, and a slight bulging portion 4b is generated in the vicinity of each corner 4a on both the upper and lower surfaces as indicated by a two-dot chain line.
[0015]
In the second horizontal rolling step H2, the first corner R flat rolled material 4 is squeezed on both the upper and lower surfaces to form a second oval rolled material (plate thickness t3, width w3) 5 having a predetermined cross-sectionally long plate thickness. Molded. The thick first corner R flat rolled material 4 is squeezed on both the upper and lower surfaces in the second horizontal rolling step H2 so that both sides bulge outward and have an elliptical cross section. Further, the bulging portions 4b on the upper and lower surfaces of the first corner R flat rolled material 4 are flattened in the second horizontal rolling step H2.
[0016]
This thin second oval rolled material 5 is the second vertical rolling step V2 in which both sides are squeezed to leave a part (corner) of the arc of the oval rolled material 5 at the corner 6a. A corner R flat rolled material (sheet thickness t4, width w4) 6 is formed. Next, in the third horizontal rolling step H3, the third corner R flat rolled material having a thickness t5 and a width w5) in which the upper and lower surfaces of the second corner R flat rolled material 6 are slightly crushed to leave R in the corner 7a. 7 to form. R of the corner 7a is substantially the same as R of the corner 6a of the corner R flat rolled material 6. In the final third horizontal rolling step H3, the appearance is improved by forming the wide upper and lower surfaces of the second corner R flat rolled material 6 into good flat surfaces. Therefore, the final third horizontal rolling process H3 is necessary. Thus, the corner R flat rolled material 7 is formed from the round bar material 2 by a 5-pass rolling process of H1-V1-H2-V2-H3. This corner R flat rolled material 7 is a product.
[0017]
When the predetermined corner R flat rolled material 7 is formed from the round bar material 2, the manufacturing process is a three-pass rolling of the first horizontal rolling process H1-first vertical rolling process V1-second horizontal rolling process H2. In this case, the rolled material 5 formed as shown in FIG. 1 (d) has an oval cross-sectional shape in which the left and right side portions bulge, resulting in poor molding. As described above, the last step of the rolling step is preferably a horizontal rolling step in order to make the wide upper and lower surfaces good planes. Therefore, the top of the 5-pass rolling is 7-pass rolling. However, adding the third vertical rolling process and the fourth horizontal rolling process after the third horizontal rolling process H3 in the fifth pass to form a seven-pass rolling is not necessary because it only increases the number of rolling processes. is there. Therefore, the 5-pass rolling process described above is sufficient.
[0018]
Now, as a result of various experiments in manufacturing the corner R flat rolled material while leaving a part of the outer shape (arc) of the round bar material 2 as described above, the inventors of the present application have found that the size (outer diameter) of the round bar material 2 is as follows. It was found that there is a correlation between the diameter of the base material) and the corner R of the corner R flat rolled material 7 as the final product. When the ratio (L1 / L2) of the outer peripheral length (L1) of the round bar material cross section to the outer peripheral length (L2) of the product cross section is defined as the peripheral length change rate (δ), the peripheral length change rate (δ) and the product For example, in the case of SUS304 described below, it has been found that there is a correlation as shown in the graph of FIG.
(Example)
SUS304 is used as a round bar material, corner R and four types of product corner R flat rolled material (product 1 to product 4) with different outer dimensions are manufactured by the above-mentioned 5-pass rolling, and data on the rate of change in circumference (δ) Asked. The experimental results are shown in Table 1.
[0019]
[Table 1]

[0020]
Based on Table 1, the relationship between the product corner R and the perimeter change rate (δ) is shown in FIG.
Next, the case where the size (outer diameter) of the round bar material is determined when forming the flat rolled material of the corner R will be described.
First, the perimeter change rate (δ) for the required product corner R is obtained from the graph of FIG. The outer peripheral length L2 of the product cross section is known, and the outer peripheral length L1 of the cross section of the round bar material is L1 = δ × L2. Therefore, the size (outer diameter) D of the round bar material is D = (δ × L2) / Π. Thereby, an appropriate size (outer diameter) of the round bar material can be determined from the necessary product corner R.
[0021]
In addition, although the case where the product corner R flat rolled material 7 was manufactured from the round bar material 2 was described as being formed by hot rolling, it goes without saying that it may be formed by cold rolling.
Moreover, although the case where SUS304 was used as a round bar material was described in the said Example, it is not restricted to this, Of course, it can respond also to another material. In this case, the corner R of the product changes according to the material of the round bar material, but the first-order correlation between the peripheral length change rate (δ) and the corner R of the product as described above is maintained.
[0022]
【The invention's effect】
As described above, according to the present invention, the product corner R flat rolled material can be produced as it is by hot rolling as it is by the caliberless flat rolling using the small-diameter round bar material, and the workability is greatly improved. At the same time, the manufacturing equipment can be simplified. Furthermore, it is possible to manufacture with a small amount and a free size, and the manufacturing cost can be reduced.
[0023]
According to the invention of claim 2, it becomes possible to easily determine a round bar material of an appropriate size according to the product corner R, thereby improving workability.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a manufacturing process of a method for manufacturing a corner R flat rolled material according to the present invention.
FIG. 2 is a graph showing a relationship between a product corner R and a circumference change rate in the manufacturing method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Caliberless flat rolling mill 2 Round bar raw material 3 1st section oblong rolling material 4 1st thick corner R flat rolling material 5 2nd section oblong rolling material 6 2nd thin-walled corner R flat rolling material 7 Product Corner R flat rolled material H1, H2, H3 Horizontal rolling process V1, V2 Vertical rolling process

Claims (2)

A method of manufacturing a corner R flat rolled material in which R is provided at a corner of a flat rolled material,
A round bar material is subjected to 5-pass rolling in the order of first horizontal rolling, first vertical rolling, second horizontal rolling, second vertical rolling, and third horizontal rolling by Caliberless rolling. A method for producing a corner R flat rolled material, characterized by producing a rolled material. The method of manufacturing a corner R flat rolled material according to claim 1, wherein the size of the round bar material is determined based on a ratio of an outer peripheral length of a cross section of the round bar material and an outer peripheral length of a cross section of the product.

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