JPS61193723A - Production of angular pipe - Google Patents

Production of angular pipe

Info

Publication number
JPS61193723A
JPS61193723A JP3449485A JP3449485A JPS61193723A JP S61193723 A JPS61193723 A JP S61193723A JP 3449485 A JP3449485 A JP 3449485A JP 3449485 A JP3449485 A JP 3449485A JP S61193723 A JPS61193723 A JP S61193723A
Authority
JP
Japan
Prior art keywords
forming
corner
corner part
roll
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3449485A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Kuwata
桑田 一義
Mutsuya Senkawa
洗川 睦也
Hiromu Kurokawa
黒川 煕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP3449485A priority Critical patent/JPS61193723A/en
Publication of JPS61193723A publication Critical patent/JPS61193723A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes

Abstract

PURPOSE:To reduce a forming load and to obtain the angular pipe having high dimensional accuracy by pre-heating to the necessary optimal temp. for formation the part to become the corner part of a strip plate at the front of the forming roll to form with bend the corner part. CONSTITUTION:A heating device 21 is installed at the preceding step of the rolling roll of the corner part 19 at the upper side of forming stand group 12 and the part to become the upper side corner part 19 of a strip steel 11 is made pre-heatable to the optimal temp. necessary for the bend forming. The part to become the lower side corner part 20 is made pre-heatable as well by setting up heating device 22 on the preceding step of the forming roll of the lower side corner part 20 similarly. The heating devices 21, 22 are to be by electric conduction heating method and controlled so as to obtain the optimal heating conditions according to the material, plate thickness and forming speed of the strip steel 11.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、帯板から四角、六角等の角形管を製造する角
形管の製造方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing rectangular tubes, such as square or hexagonal tubes, from a strip plate.

[従来の技術] 従来、角形鋼管の製造方法として、製造すべき角形鋼管
の寸法に合わせて、所用幅のコイル状帯鋼を成形ロール
群に送り込み、直接角形断面の鋼管を成形するロール成
形方法が提案されている。
[Prior Art] Conventionally, as a method for manufacturing square steel pipes, a roll forming method is used in which a coiled steel strip of a required width is fed into a group of forming rolls to directly form a steel pipe with a square cross section according to the dimensions of the square steel pipe to be manufactured. is proposed.

[発明が解決しようとする問題点] しかしながら、上記従来の角形管の製造方法では、角形
断面のコーナー部を冷間で曲げ加工するため大きな成形
荷重が必要となる。また、成形ロールのコーナー部の曲
率と成形される帯鋼コーナー部は全体に密着する状態で
成形されず、特に板厚の厚い場合には、成形ロールのコ
ーナー部と帯鋼コーナー部に隙間ができ、同時に加工さ
れる帯鋼の左右のコーナー部曲率が異なり不正確に成易
いという欠点がある。さらにまた、帯鋼コーナー部曲げ
加工段数を少なくして急激に曲げる場合には、角形鋼管
のコーナー部に亀裂を生ずる可能性があり、したがって
、溶接するまでの上記曲げ成形段数を12ないし15段
と多くする必要があり、所用ロールスタンド数が多くな
り、成形ロール駆動モータ数、ロール数も多く、エネル
ギー損失が大となる。
[Problems to be Solved by the Invention] However, in the above-mentioned conventional method for manufacturing a rectangular tube, a large forming load is required because the corners of the rectangular cross section are cold bent. In addition, the curvature of the corner of the forming roll and the corner of the steel strip to be formed are not formed in a state where they are in close contact with each other, and especially when the plate is thick, there is a gap between the corner of the forming roll and the corner of the steel band. However, there is a drawback that the curvatures of the left and right corners of the steel strips processed at the same time are different and are likely to be formed inaccurately. Furthermore, if the number of bending steps at the corner portion of the steel strip is reduced and the bending is performed rapidly, cracks may occur at the corner portion of the square steel pipe. This requires a large number of roll stands, a large number of forming roll drive motors, a large number of rolls, and a large energy loss.

なお、帯鋼を丸形素管に丸形成形したのち、角形成形ロ
ール装置によって該丸形素管を角形鋼管に角形成形する
角形鋼管の製造方法として、特開昭57−187114
に示されるように、角形成形途上の素管のコーナー部に
管内より管内ロールを当接させて圧延成形する方法が提
案され、角形鋼管の寸法精度の向上が図られている。し
かしながら、この場合には、大なる成形荷重がコーナー
部に作用し、該コーナー部に亀裂を生ずる恐れがある等
の不都合がある。
In addition, as a manufacturing method of a square steel pipe, in which a strip steel is formed into a round blank tube, and then the round blank tube is squared into a square steel tube using a square forming roll device, Japanese Patent Application Laid-open No. 187114-1987
As shown in , a method has been proposed in which roll forming is carried out by abutting the corner portion of a raw pipe from inside the pipe to the corner portion of the raw pipe in the process of forming the square shape, and the dimensional accuracy of the square steel pipe is improved. However, in this case, there are disadvantages such as a large forming load acting on the corner portions, which may cause cracks in the corner portions.

本発明は、ロール成形により角形管を直接連続して製造
する方法において、成形荷重を軽減するとともに、成形
スタンド数の比較的少ない成形スタンド群で1寸法績度
の高い角形管を製造可能とすることを目的とする。
The present invention reduces the forming load in a method of directly and continuously manufacturing square tubes by roll forming, and makes it possible to manufacture square tubes with high performance in one dimension using a relatively small number of forming stands. The purpose is to

[問題点を解決するための手段] 本発明は、帯板を直i角形断面に曲げ成形し、その継目
を溶接する角形管の製造方法において。
[Means for Solving the Problems] The present invention relates to a method for manufacturing a rectangular tube in which a strip plate is bent into a rectangular cross section and the joints are welded.

帯板のコーナー部となる部分を曲げ成形する成形ロール
の前面で、該コーナー部となる部分を曲げ成形に必要な
最適温度に予加熱するようにしたものである。
The corner portion of the strip is preheated to the optimum temperature necessary for bending and forming the corner portion on the front surface of a forming roll that bends and forms the corner portion of the strip.

[作 用] 本発明によれば、成形ロールは帯板の加熱された部分を
曲げ成形することとなり、成形荷重を軽減することが可
能となり、成形スタンド数を比較的少なくすることが可
能となる。また、帯板は成形ロールの曲げ成形部に密着
する状態で、そのコーナー部を成形され、寸法精度の高
い角形管を得ることが可能となる。
[Function] According to the present invention, the forming roll bends and forms the heated portion of the strip, making it possible to reduce the forming load and making it possible to relatively reduce the number of forming stands. . Furthermore, the corner portions of the strip are formed in close contact with the bending portion of the forming roll, making it possible to obtain a rectangular tube with high dimensional accuracy.

[実施例] 第4図は直接角形鋼管成形装置を示す配置図、第5図は
第4図の成形装置による成形工程図である。この成形装
置は、帯鋼11をフォーミングスタンド群12により第
5図の上から下に示すように、角形鋼管のコーナー部と
なる箇所を順次曲げ成形し、溶接ロール13の直前で電
気抵抗加熱により溶接すべき上辺の両エツジ部を加熱し
、溶接ロール13で加圧接合し、クーリングゾーン14
を経て、サイジングスタンド群15で角形に定形し、そ
の後、走行切断機16で所定長さに切断し、ランアウト
コンベア17を経て角形鋼管18を搬出することを可能
としている。なお、第6図は、フォーミングスタンド群
12における上下のコーナー部成形ロール12A、12
Bによる曲げ成形状態を示す正面図である。
[Example] Fig. 4 is a layout diagram showing a direct square steel pipe forming apparatus, and Fig. 5 is a forming process diagram using the forming apparatus shown in Fig. 4. This forming device sequentially bends a steel strip 11 at the corner portions of a square steel pipe as shown from top to bottom in FIG. Both edges of the upper side to be welded are heated and welded together under pressure using a welding roll 13.
The square steel pipe 18 is shaped into a rectangular shape by a group of sizing stands 15, then cut to a predetermined length by a traveling cutter 16, and transported out via a run-out conveyor 17. Note that FIG. 6 shows the upper and lower corner forming rolls 12A, 12 in the forming stand group 12.
FIG. 3 is a front view showing the state of bending according to B.

ここで、帯鋼11は、上記フォーミングスタンド群12
において、まず上辺コーナー部19を曲げ成形され、続
いて下辺コーナー部20を曲げ成形される。上辺コーナ
ー部19とは、角形鋼管18の第5図に示す断面におい
て上辺と左右側辺とが交差するコーナー部をいい、下辺
コーナー部20とは、角形鋼管18の第5図に示す断面
において下辺と左右側辺とが交差するコーナー部をいう
、帯鋼11の全幅Wは、製造すべき角形鋼管18の寸法
によって定まり、第3図に示すように、上記全幅Wの両
端から1/8−Wの部位が上辺コーナー部19に対応し
、該上辺コーナー部19に対応する部位から1/4 ・
Wの部位が下辺コーナー部20に対応することとなる。
Here, the steel strip 11 is connected to the forming stand group 12.
In this step, the upper corner portion 19 is first bent and formed, and then the lower corner portion 20 is bent and formed. The upper side corner part 19 refers to the corner part where the upper side and the left and right sides intersect in the cross section shown in FIG. 5 of the square steel pipe 18, and the lower side corner part 20 refers to the corner part in the cross section shown in FIG. The total width W of the steel strip 11, which refers to the corner portion where the lower side and the left and right sides intersect, is determined by the dimensions of the square steel pipe 18 to be manufactured, and as shown in FIG. - The part W corresponds to the upper corner part 19, and 1/4 from the part corresponding to the upper corner part 19.
The portion W corresponds to the lower corner portion 20.

しかして1本発明においては、第1図に示すように、フ
ォーミングスタンド群12の上辺コーナー部成形ロール
の前段に、加熱装置21を設置し、帯鋼11の上辺コー
ナー部19となる部分を曲げ成形に必要な最適温度に予
加熱可能とする。
Therefore, in the present invention, as shown in FIG. 1, a heating device 21 is installed in front of the upper corner forming roll of the forming stand group 12, and the portion that will become the upper corner 19 of the steel strip 11 is bent. Enables preheating to the optimum temperature required for molding.

加熱装置21は、予め測定される帯鋼11の全幅Wに基
づき、その両端から1/8−Wの部位に対応位置される
The heating device 21 is located at a position 1/8-W from both ends of the steel strip 11 based on the total width W of the steel strip 11 measured in advance.

また、本発明においては、第2図に示すように、フォー
ミングスタンド群12の下辺コーナー部成形ロールの前
段に、加熱装置?2を設置し、帯鋼11の下辺コーナー
部20となる部分を曲げ成形に必要な最適温度に予加熱
可能とする。加熱装置22は、上記の上辺コーナー部1
9に対応する部位からlハ・Wの部位に対応位置される
In addition, in the present invention, as shown in FIG. 2, a heating device is installed in front of the lower corner forming roll of the forming stand group 12. 2 is installed so that the lower corner portion 20 of the steel strip 11 can be preheated to the optimum temperature required for bending. The heating device 22 is connected to the upper corner portion 1
It is located correspondingly from the part corresponding to 9 to the part 1/W.

なお、加熱装置21.22は、電気誘導加熱方式による
ものでも、ガス加熱方式によるものでもよい、上記実施
例においては、加熱装置21.22を電気誘導加熱方式
によるものとし、帯鋼11の材質、板厚、成形速度を入
力することにより、最適加熱条件が得られるように制御
可能としている。
The heating devices 21 and 22 may be based on an electric induction heating method or a gas heating method. In the above embodiment, the heating devices 21 and 22 are based on an electric induction heating method, and the material of the steel strip 11 is By inputting the plate thickness, molding speed, etc., it is possible to control the heating conditions to obtain the optimum heating conditions.

また、加熱装置21.22は、製造される角形鋼管18
の寸法に応じて、それらに対する加熱部位の位置が変動
することから、帯鋼11の幅方向に調整移動可能とされ
ている。
In addition, the heating devices 21 and 22 are used for the square steel pipe 18 to be manufactured.
Since the position of the heated portion relative to them varies depending on the dimensions of the steel strip 11, it is possible to adjust and move it in the width direction of the steel strip 11.

次に、上記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.

と記実施例によれば、フォーミングスタンド群12の成
形ロールは、帯鋼11の加熱された部分を曲げ成形する
こととなり、成形荷重を軽減することが可能となる。し
たがって、従来の冷開成形ロールによる加工では第1図
、第2図に示す1スタンドあたりの曲げ角度αが約20
度であるのに対し、本発明の上記加熱成形法による場合
には、上記1スタンドあたりの曲げ角度αを30度ない
し35度としても、コーナー部19.20に亀裂を生ず
ることなく曲げ成形することが可能である。このため、
2オ一ミングスタンド群12のスタンド数は、従来の冷
開成形方式における12ないし15スタンドを、本発明
によって8ないし10スタンドに減少させることが可能
である。また、帯鋼11のコーナー部の曲げ加工を軽荷
重で容易に行なえるため、2オ一ミングスタンド群12
の駆動電動機容量が小さくて良く、スタンド、減速機等
も軽量化でき、ロール個数も低減することが可能となる
According to the embodiment described above, the forming rolls of the forming stand group 12 bend and form the heated portion of the steel band 11, making it possible to reduce the forming load. Therefore, in conventional processing using cold-open forming rolls, the bending angle α per stand shown in Figures 1 and 2 is approximately 20.
In contrast, in the case of the heat forming method of the present invention, even if the bending angle α per stand is 30 degrees to 35 degrees, bending can be performed without causing cracks in the corner portions 19 and 20. Is possible. For this reason,
The number of stands in the two-forming stand group 12 can be reduced from 12 to 15 stands in the conventional cold-open molding method to 8 to 10 stands according to the present invention. In addition, since the corner portions of the steel strip 11 can be easily bent with a light load,
The capacity of the drive motor can be small, and the weight of the stand, reducer, etc. can be reduced, and the number of rolls can also be reduced.

また、従来の冷開成形加工では、第7図に示すように、
上下のコーナー部成形ロール12A、12Bと帯鋼11
とが点接触となり、隙間を生じているのに対し、本発明
の上記加熱成形法によれば、成形ロールと帯鋼とが線接
触することとなり、寸法精度の高い角形断面のロール成
形が可能となる。
In addition, in the conventional cold-open forming process, as shown in Figure 7,
Upper and lower corner forming rolls 12A, 12B and steel strip 11
In contrast, according to the above heat forming method of the present invention, the forming roll and the steel strip come into line contact, making it possible to roll form a rectangular cross section with high dimensional accuracy. becomes.

[発明の効果] 以上のように、本発明は、帯板を直接角形断面に曲げ成
形し、モの継目を溶接する角形管の製造方法において、
帯板のコーナー部となる部分を曲げ成形する成形ロール
の前面で、該コーナー部となる部分を曲げ成形に必要な
最適温度に予加熱するようにしたものである。したがっ
て、−ロール成形により角形管を直接連続して製造する
方法において、成形荷重を軽減し、成形スタンド数の比
較的少ない成形スタンド群で、寸法精度の高い角形管を
製造することが可能となる。
[Effects of the Invention] As described above, the present invention provides a method for manufacturing a rectangular pipe in which a strip is directly bent into a rectangular cross section and the joints of the rectangular tube are welded.
The corner portion of the strip is preheated to the optimum temperature necessary for bending and forming the corner portion on the front surface of a forming roll that bends and forms the corner portion of the strip. Therefore, in the method of directly and continuously manufacturing square tubes by roll forming, it is possible to reduce the forming load and manufacture square tubes with high dimensional accuracy using a relatively small number of forming stands. .

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は帯鋼上辺コーナー部の成形方法を示す模式図、
第2図は帯鋼下辺コーナー部の成形方法を示す模式図、
第3図は成形前の帯鋼を示す断面図、第4図は直接角形
鋼管成形装置を示す配置図、第5図は第4図の成形装置
による成形工程図、第6図はコーナー部成形ロールを示
す要部正面図、第7図は従来のコーナー部成形ロールに
よる成形状態を示す要部正面図である。 11・・・帯鋼、12・・・フォーミングスタンド群、
12A、12B・・・コーナー部成形ロール、13・・
・溶接ロール、18・・・角形鋼管、19・・・上辺コ
ーナー部、20・・・下辺コーナー部、21.22・・
・加熱装置。 代理人   弁理士  塩 川 修 治第 1 図 嬉2図 ′$ 3 図 第 4  UA 第5図 第6図 第7図
Figure 1 is a schematic diagram showing the method of forming the upper corner of the steel strip.
Figure 2 is a schematic diagram showing the forming method of the lower corner of the steel strip.
Figure 3 is a sectional view showing the steel strip before forming, Figure 4 is a layout diagram showing the direct square steel pipe forming equipment, Figure 5 is a forming process diagram using the forming equipment shown in Figure 4, and Figure 6 is corner forming. FIG. 7 is a front view of the main part showing the roll, and FIG. 7 is a front view of the main part showing the state of forming by the conventional corner forming roll. 11... Steel strip, 12... Forming stand group,
12A, 12B... corner forming roll, 13...
・Welding roll, 18... Square steel pipe, 19... Upper side corner part, 20... Lower side corner part, 21.22...
・Heating device. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 2 '$ 3 Figure 4 UA Figure 5 Figure 6 Figure 7

Claims (1)

【特許請求の範囲】[Claims] (1)帯板を直接角形断面に曲げ成形し、その継目を溶
接する角形管の製造方法において、帯板のコーナー部と
なる部分を曲げ成形する成形ロールの前面で、該コーナ
ー部となる部分を曲げ成形に必要な最適温度に予加熱す
ることを特徴とする角形管の製造方法。
(1) In a method for manufacturing a square tube in which a strip plate is directly bent into a square cross section and the joints are welded, the portion that will become the corner portion is on the front side of the forming roll that bends and forms the corner portion of the strip plate. A method for manufacturing a rectangular tube, characterized by preheating the tube to the optimal temperature required for bending.
JP3449485A 1985-02-25 1985-02-25 Production of angular pipe Pending JPS61193723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3449485A JPS61193723A (en) 1985-02-25 1985-02-25 Production of angular pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3449485A JPS61193723A (en) 1985-02-25 1985-02-25 Production of angular pipe

Publications (1)

Publication Number Publication Date
JPS61193723A true JPS61193723A (en) 1986-08-28

Family

ID=12415797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3449485A Pending JPS61193723A (en) 1985-02-25 1985-02-25 Production of angular pipe

Country Status (1)

Country Link
JP (1) JPS61193723A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0399725A (en) * 1989-09-09 1991-04-24 Nakajima Kokan Kk Roll forming method for large sized square steel pipe
JPH0581660U (en) * 1992-04-07 1993-11-05 アンリツ株式会社 Combination weighing machine
CN102240715A (en) * 2011-05-09 2011-11-16 霸州市老边幕墙金属材料有限公司 Forming process for special C-shaped channel steel
CN102729013A (en) * 2012-07-05 2012-10-17 德清县天创五金制品有限公司 C-type steel hot extrusion production process
CN104971959A (en) * 2015-07-23 2015-10-14 上海宝钢型钢有限公司 High-strength closed sectional material hot roll forming process
JP2018103234A (en) * 2016-12-27 2018-07-05 株式会社 英田エンジニアリング Cold roll forming machine and heater thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0399725A (en) * 1989-09-09 1991-04-24 Nakajima Kokan Kk Roll forming method for large sized square steel pipe
JPH0581660U (en) * 1992-04-07 1993-11-05 アンリツ株式会社 Combination weighing machine
CN102240715A (en) * 2011-05-09 2011-11-16 霸州市老边幕墙金属材料有限公司 Forming process for special C-shaped channel steel
CN102729013A (en) * 2012-07-05 2012-10-17 德清县天创五金制品有限公司 C-type steel hot extrusion production process
CN104971959A (en) * 2015-07-23 2015-10-14 上海宝钢型钢有限公司 High-strength closed sectional material hot roll forming process
JP2018103234A (en) * 2016-12-27 2018-07-05 株式会社 英田エンジニアリング Cold roll forming machine and heater thereof

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