JPH0592212A - Square pipe and production thereof - Google Patents
Square pipe and production thereofInfo
- Publication number
- JPH0592212A JPH0592212A JP3252185A JP25218591A JPH0592212A JP H0592212 A JPH0592212 A JP H0592212A JP 3252185 A JP3252185 A JP 3252185A JP 25218591 A JP25218591 A JP 25218591A JP H0592212 A JPH0592212 A JP H0592212A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- square pipe
- plate body
- metal plate
- square
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Punching Or Piercing (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、角パイプとその製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square pipe and its manufacturing method.
【０００２】[0002]
【従来の技術】例えば、上下複数段の棚板を有するラッ
クの支柱や建設資材等においては、鋼製の角パイプが広
く利用されている。この角パイプは、通常、帯状の金属
板体を複数のロールをタンデムに配置したロール成形機
にかけてロール成形することにより製造されるが、特に
ラックの支柱として用いる角パイプの場合には、棚板を
掛止させるための切欠孔を角パイプの側面に設けておく
のが一般的である（図１参照）。2. Description of the Related Art For example, square pipes made of steel are widely used for supporting columns of racks having a plurality of upper and lower shelves and construction materials. This square pipe is usually manufactured by roll-forming a strip-shaped metal plate by a roll-forming machine in which a plurality of rolls are arranged in tandem. Especially, in the case of a square pipe used as a support for a rack, a shelf board is used. It is common to provide a notch hole for hooking the side wall of the square pipe (see FIG. 1).
【０００３】図１３は、かかる切欠孔を設けた角パイプ
の従来の製造方法を示している。即ち、従来では、先ず
帯状の金属板体20を断面丸形にロール成形してその板端
を電縫溶接した後、できた丸形管21を四方からロール22
で徐々に押圧して角形管23とし、その後、角形管23の側
面にパンチング24によって切欠孔25を設けるようにして
いた。FIG. 13 shows a conventional method for manufacturing a square pipe provided with such a cutout hole. That is, in the prior art, first, a strip-shaped metal plate body 20 is roll-formed into a circular cross-section and the plate ends thereof are electric resistance welded, and then a round tube 21 formed from four sides is rolled.
Then, the rectangular tube 23 is gradually pressed to form the rectangular tube 23, and then the notch hole 25 is provided on the side surface of the rectangular tube 23 by punching 24.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来の技
術では、金属板体20を一旦丸形管21に成形してから角形
管23に成形し直すことにしているため、以下に示すよう
な欠点がある。 ロール成形機が丸形用と角形用の二種類のものが必
要となり、設備コストが高くつきしかも作業場占有面積
が大きくなる。 溶接線26における亀裂の発生を防止するため、従来
では、溶接線26を角パイプの側面中央を通るようにしな
ければならならず、従って、特に内厚が薄い角パイプで
はその溶接線26部分が強度上のネックとなって断面剛性
をあまり大きくできない。However, in the above conventional technique, the metal plate body 20 is once formed into the round tube 21 and then formed into the square tube 23 again. There are drawbacks. Two types of roll forming machines, one for round type and the other for square type, are required, resulting in high equipment cost and large occupation area. In order to prevent the occurrence of cracks in the weld line 26, conventionally, the weld line 26 must be made to pass through the center of the side surface of the square pipe, and therefore, in the case of a square pipe having a thin inner thickness, the weld line 26 portion is It becomes a neck for strength and the cross-sectional rigidity cannot be increased so much.
【０００５】また、従来の製造方法では、角形管23の成
形後に孔明け作業を行っているため、以下に示すような
欠点がある。 角形管23の変形防止の観点から、パンチング24の雌
型27を角形管23の断面内にスライド自在に挿入しなけれ
ば切欠孔25を設けることができない。従って、従来では
孔明け装置の構造が専ら複数で高価なものとなってお
り、この点からも設備コストが高くつく。 角パイプの断面剛性を増すために、例えば図４に示
すように、切起し片14を断面内部に残すようにして切欠
孔25を形成したい場合があるが、従来の孔明け方法で
は、雌型27を角形管23断面内でスライドさせる必要があ
るので、かかる切起し片14を形成するのは非常に困難で
ある。Further, in the conventional manufacturing method, since the hole forming work is performed after the rectangular tube 23 is formed, there are the following drawbacks. From the viewpoint of preventing deformation of the rectangular tube 23, the notch hole 25 cannot be provided unless the female die 27 of the punching 24 is slidably inserted into the cross section of the rectangular tube 23. Therefore, conventionally, the structure of the punching device is plural and the structure is expensive, and the facility cost is high in this respect as well. In order to increase the cross-sectional rigidity of the square pipe, there is a case where it is desired to form the notch hole 25 such that the cut-and-raised piece 14 is left inside the cross-section as shown in FIG. Forming such a cut-and-raised piece 14 is very difficult because the mold 27 has to be slid within the cross section of the rectangular tube 23.
【０００６】一方、例えば図１４に示す如く、金属板体
20に予め切欠孔25を設けておき、その後その金属板体20
を前記従来の技術と同様に丸形管21から角形管23にロー
ル成形することにより、孔明け作業における従来の欠点
を回避することが考えられる。しかし、この製造方法で
は、特に丸形管21から角形管23に成形し直す際に、切欠
孔25の位置ずれや切欠孔25周辺の材料が応力集中によっ
て座屈する場合があり、製品部止りが低下するという欠
点がある。On the other hand, as shown in FIG. 14, for example, a metal plate body
The notch hole 25 is provided in advance in 20 and then the metal plate 20
It is conceivable to roll-form the round tube 21 into the rectangular tube 23 in the same manner as the above-mentioned conventional technique, thereby avoiding the conventional drawbacks in the punching operation. However, in this manufacturing method, particularly when the round tube 21 is reshaped into the rectangular tube 23, the positional deviation of the notch hole 25 or the material around the notch hole 25 may buckle due to stress concentration, and the product part stops. It has the drawback of decreasing.
【０００７】本発明は、このような実情に鑑み、強度面
及び製品精度面でより優れた角パイプを提供し、しかも
かかる角パイプを極めて簡便かつ安価に製造し得るよう
にすることを目的とする。In view of the above situation, the present invention has an object to provide a square pipe which is more excellent in strength and product accuracy, and to manufacture such a square pipe extremely easily and inexpensively. To do.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成すべく、
本発明は次の技術的手段を講じた。即ち、請求項１記載
の発明は、側面に切欠孔13を有する角パイプ12を、金属
板体17をロール成形することにより製造する角パイプの
製造方法において、前記金属板体17に予め前記切欠孔13
を設けておき、その金属板体17を所定のロールフラワに
従って平板状態から直接角形断面形状にロール成形した
後、その金属板体17の板端間を突合せ溶接して角形断面
を閉塞することを特徴とする。[Means for Solving the Problems] In order to achieve the above object,
The present invention has taken the following technical means. That is, the invention according to claim 1 is a method of manufacturing a square pipe 12 in which a square plate 12 having a cutout hole 13 on a side surface is formed by roll-forming a metal plate body 17. Hole 13
Is provided, and the metal plate body 17 is directly roll-formed into a rectangular cross-sectional shape from a flat plate state according to a predetermined roll flower, and then the plate-shaped ends of the metal plate body 17 are butt-welded to close the rectangular cross-section. Characterize.
【０００９】また、請求項２記載の発明は、側面に切欠
孔13を有し、金属板体17をロール成形することにより製
造される角パイプにおいて、前記金属板体17に予め前記
切欠孔13を設け、その金属板体17は、所定のロールフラ
ワに従って平板状態から直接角形断面形状にロール成形
され、その金属板体17の板端は、角形断面のコーナ部16
において突合せ溶接されていることを特徴とする。Further, according to a second aspect of the present invention, in a square pipe having a cutout hole 13 on a side surface and manufactured by roll-forming a metal plate body 17, the cutout hole 13 is previously formed in the metal plate body 17. The metal plate body 17 is directly roll-formed into a rectangular cross-section shape from a flat plate state according to a predetermined roll flower, and the plate end of the metal plate body 17 has a corner portion 16 of a square cross-section.
It is characterized in that it is butt-welded in.
【００１０】更に、請求項３記載の発明は、切欠孔13の
一側には、角形断面の内方に膨出する切起し片14が形成
されていることを特徴とする。Further, the invention according to claim 3 is characterized in that a cut-and-raised piece 14 bulging inward of the rectangular cross section is formed on one side of the cutout hole 13.
【００１１】[0011]
【作用】本発明方法によれば、金属板体17を平板状態か
ら直接角形断面形状にロール成形するので、ロール成形
機5 が一台で済み、切欠孔13の位置ずれ等を生じさせる
ことなく所定の断面形状に成形できる。請求項２記載の
発明では、溶接線15を角パイプ12の断面コーナ部16に配
しているので、角パイプ12の断面剛性が増大する。According to the method of the present invention, since the metal plate body 17 is directly roll-formed from the flat plate state into a rectangular cross-sectional shape, only one roll-forming machine 5 is required, and the positional deviation of the notch hole 13 or the like does not occur. It can be molded into a predetermined cross-sectional shape. In the invention according to claim 2, since the welding line 15 is arranged at the cross-section corner portion 16 of the square pipe 12, the cross-section rigidity of the square pipe 12 increases.
【００１２】請求項３記載の発明では、切欠孔13の一側
に切起し片14を残すようにしており、角パイプ12の断面
欠損を有効に防止している。According to the third aspect of the present invention, the cut-and-raised piece 14 is left on one side of the cutout hole 13 to effectively prevent the square pipe 12 from being damaged in cross section.
【００１３】[0013]
【実施例】以下、図面に基づいて本発明の実施例につい
て詳述する。図２は、本発明方法が採用される角パイプ
の製造設備の概要を示している。この製造設備は、同図
左側から順に、アンコイラ1 、レベラ2 、ＮＣフィーダ
3 、切欠プレス4 、ロール成形機5 、高周波溶接機6、
走行切断器7 、ラインアウトテーブル8 をタンデムに配
置して構成されている。Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 2 shows an outline of a square pipe manufacturing facility in which the method of the present invention is adopted. The manufacturing equipment consists of an uncoiler 1, a leveler 2 and an NC feeder in order from the left side of the figure.
3, notch press 4, roll forming machine 5, high frequency welding machine 6,
It consists of a traveling cutting device 7 and a lineout table 8 arranged in tandem.
【００１４】前記ロール成形5 は、上下一対のローラ9,
10を多数直列に備えていて、本実施例では、全部で20段
のローラ9,10を有している。また、高周波溶接器6 は、
スライダ11を介してロール成形機5 の上部でパスライン
方向に移動自在に取付けられている。図３及び図４にお
いて、12は本実施例で製造対象とした角パイプで、断面
方形の鋼製のものが採用され、図外のラックの棚板を支
持する支柱となるものである。この角パイプ12は、棚板
を種々の高さで支持すべく、その側面の上下方向所定間
隔おきに多数の切欠孔13を備え、本実施例では、この切
欠孔13の一側に、角パイプ12の断面内方に膨出する切起
し片14を残すことにしている。The roll forming 5 comprises a pair of upper and lower rollers 9,
A large number of rollers 10 are provided in series, and in this embodiment, the rollers 9 and 10 have 20 stages in total. In addition, the high frequency welder 6
It is mounted on the upper part of the roll forming machine 5 via a slider 11 so as to be movable in the pass line direction. In FIGS. 3 and 4, reference numeral 12 denotes a square pipe to be manufactured in the present embodiment, which is made of steel having a rectangular cross section and serves as a column for supporting a rack shelf plate (not shown). This square pipe 12 is provided with a large number of notch holes 13 at predetermined vertical intervals on its side surface in order to support the shelf at various heights, and in this embodiment, one side of the notch hole 13 is provided with a corner. The cut-and-raised piece 14 that bulges inward of the cross section of the pipe 12 is left.
【００１５】また、15は角パイプ12の溶接線を示し、本
実施例では、この溶接線15が当該角パイプ12の断面コー
ナ部16に位置するように突合せ溶接されている。次に、
上記角パイプ12の製造方法を順を追って説明する。図１
に示す如く、先ず角パイプ12の素材となる帯状の金属板
体17は、前記アンコイラ1 及びレベラ2 によって平坦化
され、この平坦状態において切欠プレス4によって所定
位置に切欠孔13が設けられる。尚、このとき切欠孔13の
一側には、前記切起し片14が上方突出状に残されるよう
になっている。Reference numeral 15 denotes a welding line of the square pipe 12, and in this embodiment, the welding line 15 is butt-welded so that the welding line 15 is located at the cross-section corner portion 16 of the square pipe 12. next,
A method of manufacturing the square pipe 12 will be described step by step. Figure 1
As shown in FIG. 1, first, the strip-shaped metal plate body 17, which is the material of the square pipe 12, is flattened by the uncoiler 1 and the leveler 2. In this flat state, the notch hole 13 is provided at a predetermined position by the notch press 4. At this time, the cut-and-raised piece 14 is left on one side of the cutout hole 13 so as to project upward.
【００１６】その後、この切欠孔13を有する金属板体17
は、従来のように一旦丸形に成形するのではなく、前記
20段ロール成形機5 によって平板状態から直接方形断面
形状にロール成形される。図５は、かかるロール成形を
行う場合のロールフラワを示しており、同図におけるN
O.1,NO.2 …は、ロール番号を示す。Thereafter, the metal plate body 17 having the cutout holes 13 is formed.
Is not a round shape as in the past, but the above
A 20-stage roll forming machine 5 roll-forms a flat plate directly into a rectangular cross-section. FIG. 5 shows a roll flower when performing such roll forming.
O.1, NO.2 ... Indicates roll numbers.
【００１７】図５からも明らかなように、本実施例で
は、先ず第２ロールによって金属板体17の板端をアール
加工することにしている。これは、本実施例でこの板端
部分が成形後の角パイプ12の断面コーナ部16を構成する
ようにしているので、後の突合せ溶接がなされやすいよ
うにするためである。次に、第２から第８ロールによっ
て金属板体17の両端をある程度起こした後、第９から第
12ロールによって金属板体17の中央部を下側が稜線とな
るように曲げ、その後は、第13から第16ロールによって
断面を徐々に閉じて行くようにしてロール成形される。As is apparent from FIG. 5, in the present embodiment, first, the plate end of the metal plate body 17 is rounded by the second roll. This is because, in the present embodiment, the plate end portion constitutes the cross-section corner portion 16 of the square pipe 12 after being formed, so that the butt welding later can be easily performed. Next, after raising the both ends of the metal plate body 17 by the second to eighth rolls to some extent,
The center part of the metal plate body 17 is bent by the 12 rolls so that the lower side becomes the ridge line, and thereafter, the cross section is gradually closed by the 13th to 16th rolls to perform roll forming.
【００１８】そして、第17ロールにおいて、板端間が略
接触すると、第17ロールと第18ロール間に配置しておい
た前記高周波溶接機6によって板端間が突合せ溶接され
る。尚、第19及び第20ロールは、断面閉塞後の角パイプ
の断面寸法を微調整するためのロールである。尚、図６
乃至図12は、上記ロールフラワーのうち、それぞれ第
２、第６、第８、第11、第13、第16、第18ロールの縦断
面図を示す。このうち、図６において、上側のロール9
に周溝18が設けられているのは、金属板体17に形成した
切起し片14をつぶさないようにするためである。When the plate ends of the seventeenth roll are substantially in contact with each other, the plate ends are butt-welded by the high-frequency welding machine 6 arranged between the seventeenth roll and the eighteenth roll. The nineteenth and twentieth rolls are rolls for finely adjusting the cross-sectional dimension of the square pipe after the cross-section is closed. Incidentally, FIG.
12 to 12 are vertical cross-sectional views of the second, sixth, eighth, eleventh, thirteenth, sixteenth, and eighteenth rolls of the above roll flour, respectively. Of these, in FIG. 6, the upper roll 9
The peripheral groove 18 is provided on the inner surface of the metal plate body 17 in order to prevent the cut and raised piece 14 from being crushed.
【００１９】その後、上記のようにしてロール成形され
た角パイプ12は、前記走行切断機7によって所定長さに
切断され、ラインアウトテーブ8 上に搬出される。この
ように、本実施例によれば、予め切欠孔13を有する金属
板体17を直接角形断面形状にロール成形することにした
ので、ロール成形機5 が一台で済み設備コストを低減化
できると共に、切欠孔13の位置ずれやその周辺材料の座
屈を生じることなくロール成形できるので、精度の高い
切欠孔13付き角パイプ12を非常に簡便に製造することが
できる。After that, the square pipe 12 roll-formed as described above is cut into a predetermined length by the traveling cutting machine 7 and carried out onto the line out table 8. As described above, according to the present embodiment, since the metal plate body 17 having the cutout holes 13 is directly roll-formed into the rectangular cross-sectional shape, only one roll forming machine 5 is required and the equipment cost can be reduced. At the same time, the roll forming can be performed without the positional deviation of the notch hole 13 and the buckling of the peripheral material thereof, so that the square pipe 12 with the notch hole 13 with high accuracy can be manufactured very easily.
【００２０】また、本実施例に係る製造方法によれば、
ロールフラワの最終段階で突合せ溶接を行うので、上述
のように角パイプ12の溶接線15を断面コーナ部16に配置
することができ、成形後の角パイプ12の断面剛性を可及
的に増大することができる。また、切欠孔13の一側に切
起し片14が残った金属板体17をロール成形することもで
き、切欠孔13による断面欠損を有効に防止できる利点が
ある。According to the manufacturing method of this embodiment,
Since the butt welding is performed at the final stage of the roll flower, the welding line 15 of the square pipe 12 can be arranged at the cross-section corner portion 16 as described above, and the cross-sectional rigidity of the square pipe 12 after forming can be increased as much as possible. can do. Further, it is possible to roll-form the metal plate body 17 that is cut and raised on one side of the cutout hole 13 and the piece 14 remains, and it is possible to effectively prevent a cross-section loss due to the cutout hole 13.
【００２１】更に、本実施例によれば、平板状態の金属
板体17に孔明け作業を行うので、切欠プレス4 も簡単な
構造のもので足り、この点からも設備コストの低減を図
ることができる。尚、本発明は上記実施例に限定される
ものではなく、角パイプ12の断面剛性を特に高める必要
のない場合には、溶接線15を角パイプ12の側面中央に配
置するようにしてもよく、また、敢えて切起し片14を残
しておく必要もない。Further, according to the present embodiment, since the metal plate body 17 in the flat plate state is punched, the notch press 4 need only have a simple structure, and the facility cost can be reduced also from this point. You can The present invention is not limited to the above-mentioned embodiment, and when it is not necessary to particularly increase the sectional rigidity of the square pipe 12, the welding line 15 may be arranged in the center of the side surface of the square pipe 12. Also, it is not necessary to leave the raised piece 14 intentionally.
【００２２】また、本発明方法によれば、前記ラックの
支柱のみならず、その他、各種建設資材等に用いる角パ
イプも製造可能であり、ロールフラワを設計しなおすこ
とにより異形断面の角パイプも成形しうることは勿論で
ある。Further, according to the method of the present invention, not only the above-mentioned rack pillars but also other square pipes used for various construction materials can be manufactured. By redesigning the roll flower, square pipes of irregular cross section can be produced. Of course, it can be molded.
【００２３】[0023]
【発明の効果】請求項１記載の発明によれば、ロール成
形機5 が一台で済むので設備コストを低減化できると共
に、切欠孔13の位置ずれ等を生ずることなくロール成形
できるので、製品精度の高い角パイプ12を極めて簡便に
製造することができる。請求項２記載の発明によれば、
接接線15が断面コーナ部16に配置されているので、角パ
イプ12の断面剛度を増大させることができる。According to the invention described in claim 1, since only one roll forming machine 5 is required, the equipment cost can be reduced, and the roll forming can be performed without causing the positional deviation of the notch holes 13 and the like. The highly accurate square pipe 12 can be manufactured very easily. According to the invention of claim 2,
Since the tangent line 15 is arranged in the cross-section corner portion 16, the cross-section rigidity of the square pipe 12 can be increased.
【００２４】請求項３記載の発明によれば、切欠孔13の
一側に切起し片14が残されているので、角パイプ12の断
面剛度を更に増させることができる。According to the third aspect of the present invention, since the cut-and-raised piece 14 is left on one side of the cutout hole 13, the sectional rigidity of the square pipe 12 can be further increased.
【図１】角パイプの製造方法の概略説明図である。FIG. 1 is a schematic explanatory view of a method for manufacturing a square pipe.
【図２】角パイプの製造設備の側面図である。FIG. 2 is a side view of a square pipe manufacturing facility.
【図３】角パイプの斜視図である。FIG. 3 is a perspective view of a square pipe.
【図４】図３のＡ−Ａ線断面図である。4 is a cross-sectional view taken along the line AA of FIG.
【図５】ロールフラワの説明図である。FIG. 5 is an explanatory diagram of a roll flower.
【図６】第２ロールの縦断面図である。FIG. 6 is a vertical sectional view of a second roll.
【図７】第６ロールの縦断面図である。FIG. 7 is a vertical cross-sectional view of a sixth roll.
【図８】第８ロールの縦断面図である。FIG. 8 is a vertical sectional view of an eighth roll.
【図９】第１１ロールの縦断面図である。FIG. 9 is a vertical sectional view of an eleventh roll.
【図１０】第１３ロールの縦断面図である。FIG. 10 is a vertical sectional view of a thirteenth roll.
【図１１】第１６ロールの縦断面図である。FIG. 11 is a vertical sectional view of a sixteenth roll.
【図１２】第１８ロールの縦断面図である。FIG. 12 is a vertical sectional view of an eighteenth roll.
【図１３】従来の角パイプの製造方法を示す概略説明図
である。FIG. 13 is a schematic explanatory view showing a conventional method for manufacturing a square pipe.
【図１４】比較例を示す概略説明図である。FIG. 14 is a schematic explanatory view showing a comparative example.
１２ スライダ １３ 切欠孔 １４ 切起し片 １６ 断面コーナ部 １７ 金属板体 12 slider 13 notch hole 14 cut-and-raised piece 16 cross-section corner 17 metal plate
Claims (3)
を、金属板体(17)をロール成形することにより製造する
角パイプの製造方法において、 前記金属板体(17)に予め前記切欠孔(13)を設けておき、
その金属板体(17)を所定のロールフラワに従って平板状
態から直接角形断面形状にロール成形した後、その金属
板体(17)の板端間を突合せ溶接して角形断面を閉塞する
ことを特徴とする角パイプの製造方法。1. A square pipe (12) having a notch hole (13) on its side surface.
The method for manufacturing a square pipe manufactured by roll-forming a metal plate body (17), wherein the metal plate body (17) is provided with the notch hole (13) in advance,
Characteristically, the metal plate (17) is directly roll-formed from a flat state into a rectangular cross-section according to a predetermined roll flower, and then the plate ends of the metal plate (17) are butt-welded to close the rectangular cross-section. Method for manufacturing square pipe.
をロール成形することにより製造される角パイプにおい
て、 前記金属板体(17)に予め前記切欠孔(13)を設け、その金
属板体(17)は、所定のロールフラワに従って平板状態か
ら直接角形断面形状にロール成形され、その金属板体(1
7)の板端は、角形断面のコーナ部(16)において突合せ溶
接されていることを特徴とする角パイプ。2. A metal plate body (17) having a notch hole (13) on its side surface.
In the square pipe manufactured by roll forming, the metal plate body (17) is provided with the notch hole (13) in advance, and the metal plate body (17) is a square plate directly from a flat state according to a predetermined roll flower. Roll-formed into a cross-sectional shape, and the metal plate (1
A square pipe characterized in that the plate end of 7) is butt-welded at a corner portion (16) of a rectangular cross section.
に膨出する切起し片(14)が形成されていることを特徴と
する請求項２記載の角パイプ。3. The square pipe according to claim 2, wherein a cut-and-raised piece (14) is formed on one side of the cutout hole (13) so as to bulge inward of the rectangular cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3252185A JPH0734936B2 (en) | 1991-09-30 | 1991-09-30 | Square pipe manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3252185A JPH0734936B2 (en) | 1991-09-30 | 1991-09-30 | Square pipe manufacturing method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8088320A Division JP2719129B2 (en) | 1996-04-10 | 1996-04-10 | Method for manufacturing long steel members |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0592212A true JPH0592212A (en) | 1993-04-16 |
| JPH0734936B2 JPH0734936B2 (en) | 1995-04-19 |
Family
ID=17233680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3252185A Expired - Lifetime JPH0734936B2 (en) | 1991-09-30 | 1991-09-30 | Square pipe manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0734936B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH081253A (en) * | 1994-06-15 | 1996-01-09 | Calsonic Corp | Stubbing method and device therefor |
| JPH08120828A (en) * | 1994-10-25 | 1996-05-14 | Asahi Chem Ind Co Ltd | Manufacture of long-sized building material |
| JP2012067337A (en) * | 2010-09-21 | 2012-04-05 | Nisshin Steel Co Ltd | Stainless steel square pipe for nuclear fuel storage rack, method of manufacturing the same, and rack |
| KR20210058258A (en) * | 2019-11-14 | 2021-05-24 | 주식회사 포스코 | Forming method and apparatus for metallic materials |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462216A (en) * | 1987-08-31 | 1989-03-08 | Eiwa Denki Kk | Production of cross arm for electric pole |
| JPH0399725A (en) * | 1989-09-09 | 1991-04-24 | Nakajima Kokan Kk | Roll forming method for large sized square steel pipe |
-
1991
- 1991-09-30 JP JP3252185A patent/JPH0734936B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462216A (en) * | 1987-08-31 | 1989-03-08 | Eiwa Denki Kk | Production of cross arm for electric pole |
| JPH0399725A (en) * | 1989-09-09 | 1991-04-24 | Nakajima Kokan Kk | Roll forming method for large sized square steel pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH081253A (en) * | 1994-06-15 | 1996-01-09 | Calsonic Corp | Stubbing method and device therefor |
| JPH08120828A (en) * | 1994-10-25 | 1996-05-14 | Asahi Chem Ind Co Ltd | Manufacture of long-sized building material |
| JP2012067337A (en) * | 2010-09-21 | 2012-04-05 | Nisshin Steel Co Ltd | Stainless steel square pipe for nuclear fuel storage rack, method of manufacturing the same, and rack |
| KR20210058258A (en) * | 2019-11-14 | 2021-05-24 | 주식회사 포스코 | Forming method and apparatus for metallic materials |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0734936B2 (en) | 1995-04-19 |
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