JPS58173027A - Manufacture of flanged short tube - Google Patents

Abstract

PURPOSE:To obtain a product of high quality and high reliability, by forming a rib that extends to left and right edges on the surface of a metallic plate. CONSTITUTION:A rib 21 that extends to left and right edges 22 is formed on the surface of a metallic plate 20. The metallic plate 20 is bent circularly, and left and right edges are butted to form a tube 23. At the same time, both ends of the rib 21 are butted by circular bending, and an annular rib 24 is formed on the inner peripheral face of the tube 23. After joining butted parts of the tube 23, an end of the tube 23 is expanded and bent on the annular rib 24 forming line to form a flange 26. At the same time, the inner diameter corner part 27 of the flange 26 is formed by plastic deformation of the annular rib caused by the expanding work.

Description

【発明の詳細な説明】 本発明は長尺のパイプを接合する場合に継手として好適
に用いられる鍔付短管の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a flanged short pipe that is suitably used as a joint when joining long pipes.

長尺パイプを接合する場合に、パイプの端部に鍔付短管
を溶接利けし、一方のパイプの鍔と他方のパイプの鍔を
突き合せ両鍔をフランジにて締付する方法が従来より採
用されている。When joining long pipes, the conventional method is to weld a flanged short pipe to the end of the pipe, butt the flanges of one pipe against the flanges of the other pipe, and tighten both flanges with flanges. It has been adopted.

この種鍔付短管は上記目的で使用されるものであるから
、第１図に示すように（締付フランジを省略して図示す
る）、各短管１，２の鍔部３，４を突合せだ時に鍔部３
，４の内径角部５，６は管部７，８の内径と正確に一致
する角出しがなされていること、該角出しの要請と強度
確保のため折曲部９，１ｏに充分な肉厚を保有すること
等が要求される。例えば鍔部３，４の内径角部の角出し
が充分でないと、鍔突合せ部境界線上に図中点線で示す
如き環状溝１１が形成されてこの部分で管の径が不均等
となる。この結果、パイプ内を流れる流体抵抗が変化し
たり、同所に液がたまって浸透あるいは腐蝕の問題を生
ずる恐れがある。Since this type of flanged short pipe is used for the above purpose, the flanges 3 and 4 of each short pipe 1 and 2 are attached as shown in Fig. 1 (the tightening flange is omitted). Tsuba 3 when butting
, 4, the inner diameter corners 5, 6 of the tubes 7, 8 should be squared to exactly match the inner diameters of the pipe parts 7, 8, and sufficient thickness should be provided at the bent parts 9, 1o to ensure the required cornering and strength. It is required to maintain the thickness. For example, if the inner diameter corners of the flanges 3 and 4 are not sufficiently angled, an annular groove 11 as shown by the dotted line in the figure is formed on the boundary line of the flanges butt, and the diameter of the tube becomes uneven in this portion. As a result, the resistance of fluid flowing through the pipe may change, or liquid may accumulate in the same location, causing problems with seepage or corrosion.

上記の如き鍔付短管１の製造法としては溶接加工と深絞
り加工によることが可能である。前者は短管と鍔とを別
々に製造し、溶接によって一体とする方法であるが、こ
の方法は素材及び加二［コストが高くつき、しかも最も
健全な強度が要求される鍔部と管部の接合を溶接で行う
ため、信頼度に欠ける短所がある。又後者の深絞り加工
は製品に薄肉部が生成される欠点があり、殊に接曲部に
著しい肉痩せが生じて鍔部内径角部が弧形となるために
、ソヤーグな角出しを行うためには鍔部の突合せ面と管
部の内周面との双方から可成りの量の副面加工を行わな
ければならず、強度の要求される折曲角部の肉厚が益々
薄くなる。従って所定の肉厚の鍔付短管を製造するには
肉痩せ及び副面量を見込んだ厚みのある累月を使用しな
ければならず、余り厚いと亀裂の問題も出る。父上記加
工上、深絞り後の底板の抜きや、広面積の副面を伴なう
ので歩どまりが非常に悪化し、結局は加工コストが高く
つく。The short flanged pipe 1 as described above can be manufactured by welding and deep drawing. The former method involves manufacturing the short pipe and the flange separately and welding them together, but this method is expensive due to the high cost of materials and the flange and pipe parts, which require the most sound strength. Since the joints are made by welding, there is a disadvantage of lack of reliability. In addition, the latter deep drawing process has the disadvantage of producing thin wall parts in the product, and in particular, there is significant wall thinning at the tangent part and the inner diameter corner of the flange becomes arcuate, so it is necessary to perform a Soyag cornering process. In order to achieve this, a considerable amount of secondary surface machining must be performed on both the abutting surface of the flange and the inner peripheral surface of the tube, and the wall thickness of the bent corner where strength is required becomes thinner and thinner. . Therefore, in order to manufacture a flanged short tube with a predetermined wall thickness, it is necessary to use a thick tube that takes into account thinning of the wall and amount of secondary surface, and if it is too thick, there will be a problem of cracking. The above-mentioned processing involves punching out the bottom plate after deep drawing and creating a wide-area secondary surface, which results in a very low yield and ultimately increases processing costs.

最もコスト的に廉価な方法として出願人は板拐で管を作
り、該管の一端に拡管曲加工を施して鍔部を形成する方
法を考えたが、この方法によっても鍔部の内径角部には
弧形面の生成が見られ、弧形面を除去し、直角を出すた
め前記した広面積の副面が必要となり、結果的に折曲部
の肉厚が確保できない欠点がある。As the cheapest method, the applicant considered a method in which a tube is made by cutting a sheet of paper and one end of the tube is expanded and bent to form a flange. In order to remove the arcuate surface and create a right angle, a secondary surface with a wide area is required, resulting in the disadvantage that the thickness of the bent portion cannot be ensured.

而して、本発明は最後に述べた価格的に有利な板材より
短管を加工する方法を踏襲しつつ、工賃アップを招かず
、しかも大損りな副面加工を伴なわずに折曲部の厚み確
保と鍔部内径角部のシャープな角出しとを可能とした鍔
付短管製造法を提供するものである。Therefore, the present invention follows the method of machining short pipes from plate materials, which is advantageous in cost, as described in the end, and also enables the bending part to be processed without increasing labor costs and without having to perform costly side surface machining. To provide a method for manufacturing a short pipe with a flange, which makes it possible to secure the thickness and form a sharp corner of the inner diameter of the flange.

以下図示の実施例に基いて詳述する。A detailed explanation will be given below based on the illustrated embodiment.

先ず、第２図Ａ、Ｂ図に示すように素材としてその表面
に左右耳端２２に至るリブ２１を突成した方形の金属プ
レート２０を準備する。First, as shown in FIGS. 2A and 2B, a rectangular metal plate 20 having ribs 21 projecting from its surface extending to the left and right ear ends 22 is prepared as a raw material.

上記リブ２１は圧延された板材にダイス引抜きにて形成
するか、又圧延時に同時に形成する。この場合、長尺の
板材にリブ２１を複数条形成し、切断にて所定の寸法の
金属グレート２０を得ることができる。The ribs 21 are formed on the rolled plate material by drawing with a die, or are formed simultaneously during rolling. In this case, a plurality of ribs 21 are formed on a long plate material, and the metal grate 20 of a predetermined size can be obtained by cutting.

次に第３図Ａ、Ｂ図に示すように上記金属プレート２０
に円形曲げ加工を施し該プレート２０の左右耳端２２を
突合せて管２３を形成し、同時に上記円形曲げ加工によ
り上記リブ２１の両端を突合せて上記管内周面に環状リ
プ２４を形成する。この場合、左右耳端２２及び環状リ
ブ２４の突合せ部２５に若干の間隙があっても良い。Next, as shown in FIGS. 3A and 3B, the metal plate 20
A circular bending process is applied to the plate 20 to abut the left and right ear ends 22 of the plate 20 to form a tube 23, and at the same time, both ends of the rib 21 are abutted by the circular bending process to form an annular lip 24 on the inner peripheral surface of the tube. In this case, there may be a slight gap between the left and right ear ends 22 and the abutting portions 25 of the annular ribs 24.

次に第３図Ｃ図に示すように、上記管２３の突合せ部２
５を溶接３２後、第４図、第５図に示すように、上記環
状リブ２４の形成線上において管２３の一端に拡管曲加
工を施して鍔２６を形成すると共に、該拡管曲加工に伴
なう環状リブ２４の塑性変形を促して鍔２６の内径角部
２７を形成する。図中２８は管２３の外周を杷持する固
定型、２９は管２３の一端へ突き込まれる可動型であり
、図示のように管２３の一端を鍔２６の加工しろだけ固
定型２８より突出させ、環状リブ２４が附の角になる位
置に予じめセットし、」二記環状リブ２４の形成線上に
おける拡管曲加工を可能とする。Next, as shown in FIG. 3C, the butt portion 2 of the tube 23 is
After welding 32, as shown in FIGS. 4 and 5, one end of the tube 23 is expanded and bent on the formation line of the annular rib 24 to form a collar 26, and along with the expansion and bending process, The inner diameter corner portion 27 of the collar 26 is formed by promoting plastic deformation of the annular rib 24. In the figure, 28 is a fixed type that holds the outer periphery of the tube 23, and 29 is a movable type that is pushed into one end of the tube 23. As shown in the figure, one end of the tube 23 protrudes from the fixed type 28 by the machining allowance of the collar 26. The annular rib 24 is set in advance at a position where the annular rib 24 forms a corner, thereby making it possible to expand and bend the pipe along the formation line of the annular rib 24.

上記のようにして形成された鍔部の内径部にば゛第６図
に示すように充分な肉の盛り上がりが見られ、折曲部３
０の厚みを確保しつつ、殆んど直角に近い角部２７が生
成され、従来の如き肉痩せと大きな弧形面の生成を伴な
わない。従って角部２７は全体を熱処理した後、通常の
機械加工仕上げを行い形を整えれば、所定の精度の高い
直角出しが極めて容易に行える。As shown in FIG. 6, a sufficient amount of meat is seen on the inner diameter of the flange formed as described above, and the bent portion 3
While ensuring a thickness of 0, a nearly right-angled corner 27 is generated, and the thinning of the wall and the generation of a large arcuate surface as in the conventional case are not involved. Therefore, by heat-treating the entire corner portion 27 and then shaping it by regular machining, it is very easy to square the corner portion 27 with a high degree of predetermined accuracy.

上記鍔付短管の製造法に従えばリブ２１の長手方向の中
心線上で拡管的げを行うのが好ましい。According to the method for manufacturing the short flanged tube described above, it is preferable to target the tube expansion on the longitudinal center line of the rib 21.

この場合、図示のようにリブ２１の断面形状を略三角形
、好ましくは略二等辺三角形となし、その稜線３１（中
心線）上で上記拡管的げを行えば稜線３１が内径角部に
位置することとなるので、角出しはよりシャープに且つ
可及的に直角に近づけることができる。リブ２１の形状
として例えば他に矩形断面、方形断面、弧形断面として
も角への肉の盛り上がりは充分となり、折曲部３０の厚
みを確保しつつ、角出しが可能である。In this case, as shown in the figure, the cross-sectional shape of the rib 21 is approximately triangular, preferably approximately isosceles triangular, and if the above-mentioned tube expansion is performed on the ridge line 31 (center line), the ridge line 31 is located at the inner diameter corner. Therefore, the angle can be made sharper and as close to a right angle as possible. The shape of the rib 21 may be, for example, rectangular, rectangular, or arcuate in shape, so that the meat builds up to the corner sufficiently, and it is possible to form the corner while ensuring the thickness of the bent portion 30.

又一連のリブ２１に稜線を二条形成する等の実施方法が
考えられる。Another possible implementation method is to form two ridge lines on the series of ribs 21.

本発明によれば平プレートを素材とする鍔付短管のメリ
ットであるコスト面での有利性を活かしつつ、鍔部の折
曲部の肉厚を充分に確保しながら、肉痩せを生じさせる
ことなく内径角部の角出しが的確に行え、単に素材にリ
ブ２１を形成するのみで、リブを形成しない場合と同じ
通常の曲げ加工工程によって製造でき、格別に高度の技
術を要せずして目的達成できる。角出しのだめのパイプ
内周面の側面加工等の難作業を伴なわず、リブ成形工程
を加味しても工賃アップを招かずに高品質、高信頼の製
品を得ることができる。According to the present invention, while taking advantage of the cost advantage of a flanged short tube made of a flat plate, it is possible to create wall thinning while ensuring sufficient wall thickness at the bent portion of the flanges. By simply forming the rib 21 on the material, it can be manufactured using the same normal bending process as when no rib is formed, and does not require particularly advanced technology. You can achieve your goals. A high-quality, highly reliable product can be obtained without requiring difficult work such as side machining of the inner circumferential surface of the pipe for corner-cutting, and without increasing labor costs even when a rib forming process is added.

尚上記製造法はステンレス鋼で鍔付短管を加工する場合
により有利となる。Note that the above manufacturing method is more advantageous when machining short flanged pipes from stainless steel.

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

第１図はパイプ継手を構成する鍔伺短管の突合せ状態を
示す拡大断面図、第２図以降は本発明の実施例を示し、
第２図Ａ図は素材たる金属プレートの拡大断面図、同Ｂ
図は同平面図、第３図Ａ図は該金属プレートによって形
成された管正面図、同１３図は同拡大断面図、四〇図は
突合せ部を溶接した管断面図、第４図は拡管的工程を示
す型及び管断面図、第５図は拡管的して鍔を形成された
短管断面図、第６図は同鍔付短管の内径角部の拡大断面
図である。 ２０　金属グレート、２１　リブ、　２２　・プレート
の左右耳端、２３　管、２４・環状リブ、２５−・・突
合せ部、２６・鍔、２７・・内径角部、２８　・・固定
型、２９　可動型、３０・・・折曲部、３１　稜線、３
２　・溶接。Fig. 1 is an enlarged cross-sectional view showing the butted state of the short pipes with flanges constituting the pipe joint, and Fig. 2 and subsequent figures show embodiments of the present invention.
Figure 2A is an enlarged sectional view of the metal plate that is the material, Figure 2B
Figure 3A is a front view of the pipe formed by the metal plate, Figure 13 is an enlarged sectional view of the same, Figure 40 is a sectional view of the pipe with the butt part welded, and Figure 4 is the expanded pipe. FIG. 5 is a sectional view of a short tube with a flange formed during expansion, and FIG. 6 is an enlarged sectional view of the inner diameter corner of the flanged short tube. 20 Metal grate, 21 Rib, 22 - Left and right end of plate, 23 Pipe, 24 - Annular rib, 25 - Butt part, 26 - Flange, 27 - Inner diameter corner part, 28 - Fixed type, 29 Movable type , 30... bending part, 31 ridgeline, 3
2 ・Welding.

Claims (3)

【特許請求の範囲】[Claims] （１）金属プレートの表面に該金属プレートの左右耳端
に至るリブを形成し、上記金属プレートに円形曲げ加工
を施すことにより上記金属プレートの左右耳端を突合わ
せて管を形成し、同時に上記円形曲げ加工により上記リ
ブの両端を突合わせて上記管内周面に環状リブを形成し
、上記管の突合せ部を接合後上記環状リブ形成線上にお
いて管の一端に拡管曲加工を施して鍔を形成すると共に
、」二記拡管曲加工に伴なう環状リブの塑性変形にて鍔
の内径角部を形成したことを特徴とする鍔付短管の製造
法。(1) Forming ribs on the surface of the metal plate that reach the left and right ear ends of the metal plate, and performing a circular bending process on the metal plate to butt the left and right ear ends of the metal plate to form a tube, and at the same time By the circular bending process, both ends of the ribs are brought together to form an annular rib on the inner circumferential surface of the tube, and after joining the abutted portions of the tube, one end of the tube is expanded and bent on the annular rib formation line to form a flange. 2. A method for manufacturing a flanged short tube, characterized in that, at the same time, the inner diameter corners of the flanges are formed by plastic deformation of an annular rib accompanying the tube expansion and bending process described in item 2. （２）第１項記載の発明において、」二記リブは断面視
略三角形とし、上記拡管曲加工を行うことを特徴とする
鍔付短管の製造法。(2) In the invention described in item 1, the method for producing a flanged short pipe, characterized in that the second rib has a substantially triangular cross-sectional view, and the above-mentioned pipe expansion and bending process is performed. （３）第１項、第２項記載の発明において、上記リブは
断面視略三角形とし、該三角形リブの稜線」−において
上記拡管曲加工を行うことを特徴とする鍔付短管の製造
法。(3) In the invention described in items 1 and 2, the rib is substantially triangular in cross-sectional view, and the expanding and bending process is performed at the ridgeline of the triangular rib. .