JPH0280127A - Manufacture of elliptical bellows - Google Patents

Abstract

PURPOSE:To manufacture an elliptical bellows in hydraulic forming only and to reduce a manufacturing process by using a tube stock of ununiform thickness wherein the thickness of a major axis part of an elliptical tube stock is made larger than that of a minor axis part. CONSTITUTION:The elliptical tube stock 1 is inserted into a space made up by combining upper dies A, B, C of 8, 9, 10 arranged in an equal interval and lower dies A, B, C of 11, 12, 13 and both ends of the elliptical tube stock 1 are sealed by rolling 6, 7 provided on seal dies 4, 5 by driving cylinders 2, 3. Then, the hydraulic pressure 16 is loaded to perform free bulging. Further, cylinders 2, 3 are driven keeping the fixed hydraulic pressure 16, the upper dies 8, 9, 10 and the lower dies 11, 12, 13 are combined through the seal dies 4, 5 moved in the axial direction and the crest parts of the bellows are folded in sequence and formed. When the intervals between the seal dies 4, 5, the upper dies 8, 9, 10 and the lower dies 11, 12, 13 are gone and the whole forms one body, cylinders 2, 3 stop, the hydraulic pressure 16 is removed to separate a formed part from the dies.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、楕円ベローズの製造方法に係り、特に１ｇＪ
造工数の少ない楕円ベローズの製造方法に関するもので
ある。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing elliptical bellows, and particularly to a method for manufacturing elliptical bellows.
The present invention relates to a method of manufacturing an elliptical bellows that requires less man-hours.

〔従来の技術〕[Conventional technology]

従来の楕円ベローズの製造方法は、特開昭６１−８６０
３０号公報に記載のように、前もって液圧成形により成
形が容易な円形ベローズを成形し。The conventional manufacturing method of elliptical bellows is disclosed in Japanese Patent Application Laid-Open No. 1986-860.
As described in Japanese Patent Application No. 30, a circular bellows which is easy to form is formed in advance by hydroforming.

これを成形治具によって半径方向に加圧し、楕円ベロー
ズを製造する方法となっていた。This was pressurized in the radial direction using a forming jig to produce an elliptical bellows.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術では２円形ベローズを成形後、半径方向に
加圧する工程により楕円ベローズを製造する方法である
ため、多大な工数を要し、しかも製造設備が２台必要と
なり、製造コストが高くなるという問題があった。In the above-mentioned conventional technology, an elliptical bellows is manufactured by applying pressure in the radial direction after molding two circular bellows, which requires a large number of man-hours and requires two manufacturing equipment, resulting in high manufacturing costs. There was a problem.

本発明の目的はｌｖ１円ベローズを液圧成形のみで製造
でき、製造工数が少ない安価な楕円ベローズの製造方法
を提供することにある。An object of the present invention is to provide an inexpensive method for manufacturing an elliptical bellows, which can manufacture lv1 circular bellows only by hydraulic molding, and requires fewer manufacturing steps.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的は２曲率半径が大きく内圧を負荷した際に変形
が容易な長径部の肉厚がＪ！Ｘ　＜　、反対に短径部の
肉厚が薄い楕円形素管を用いて、液圧成形することによ
り、達成される。The above purpose is 2: The wall thickness of the long diameter part, which has a large radius of curvature and is easily deformed when internal pressure is applied, is J! X<, on the other hand, is achieved by hydroforming using an elliptical blank tube with a thin wall thickness at the short diameter portion.

〔作用〕[Effect]

第３図に示すように楕円形素管に肉圧を負荷した場合の
、長径部１αと短径部１ｂの塑性変形開始内圧Ｐ□、Ｐ
２は次式で表される。As shown in Fig. 3, when a wall pressure is applied to an elliptical blank pipe, the internal pressures P□, P at which plastic deformation starts in the major diameter part 1α and the minor diameter part 1b
2 is expressed by the following formula.

短径部：Ｐ２＝工己（Ｊ’！・・・・・・・・（２）γ
！ ただし　し、：長径部の肉厚 γ、：長径部の曲率半径 σｙ：降伏応力 し２：短径部の肉厚 γ２：短径部の曲率半径 肉厚が均一な素管の場合には し、＝１２ でありσｙは同様であるためγ１〉γ２であるから＜１
）（２）式より Ｐ　１　＜　Ｐ　ｚ・・・・・・（３）となる。よって
、内圧がＰｌでは長径部１αでは塑性変形するが短径部
１ｂでは、必要な内圧に達してないので張出し変形せず
、その後の軸方向への移動の際に、座屈を生じ良好な成
形ができない。Minor diameter part: P2 = engineering (J'!...(2) γ
! However, : Thickness of the major diameter part γ, : Radius of curvature of the major diameter part σy : Yield stress 2 : Thickness of the minor diameter part γ2 : Radius of curvature of the minor diameter part In the case of a plain pipe with uniform wall thickness, , = 12 and σy are the same, so γ1>γ2, so <1
) From equation (2), P 1 < P z (3). Therefore, when the internal pressure is Pl, the major diameter portion 1α undergoes plastic deformation, but the minor diameter portion 1b does not undergo overhanging deformation because the required internal pressure has not been reached, and buckling occurs during subsequent axial movement, resulting in a good condition. Cannot be molded.

逆に、内圧を短径部１ｂの変形に必要なＰ２を負荷する
と、長径部１αでは過度の張出し変形となってしまい、
軸方向へのたたみこみの際に、長径部１αで破断するな
どの問題が生じ良好な成形ができない。以上、楕円ベロ
ーズでは曲率の不均一によって、適正内圧が存在し得え
ず、これが楕円ベローズを液圧成形で製造できない理由
となっていた。Conversely, if the internal pressure is applied to P2 necessary for deforming the short diameter portion 1b, the long diameter portion 1α will be excessively overhanging and deformed.
When folded in the axial direction, problems such as breakage at the long diameter portion 1α occur, making it impossible to perform good molding. As mentioned above, due to the non-uniformity of the curvature of the elliptical bellows, an appropriate internal pressure cannot exist, and this is the reason why the elliptical bellows cannot be manufactured by hydroforming.

そこで、同一内圧で変形させるためには、（１）（２）
式より 尤、σＹ　　　ｊ−？σｙ □＝□・・・・・・・（４） γ１　　　　　　γ２ σｙは同様であるから 尤、＝−χｌｘ尤亡・・・・・（５） γ２ となり、（５）式の関係が成立つように素管肉厚を円周
方向で変化させた。へん肉の楕円素管を用いることによ
って、塑性変形を開始する内圧を。Therefore, in order to deform with the same internal pressure, (1) (2)
From the formula, σY j−? σy □=□・・・・・・(4) Since γ1 γ2 σy are the same, =−χlx decrease・・・(5) γ2, and the relationship of equation (5) seems to hold. The thickness of the raw pipe was changed in the circumferential direction. By using thin elliptical tubes, internal pressure is applied to initiate plastic deformation.

長径部と短径部で同一とできることが判る。It can be seen that the long diameter part and the short diameter part can be made the same.

よって、前記楕円素管を用いることで、液圧成形のみで
楕円ベローズを製造できる。Therefore, by using the elliptical blank tube, elliptical bellows can be manufactured only by hydroforming.

〔実施例〕〔Example〕

以下１本発明の一実施例を第１〜第５図により説明する
。第１〜第３図において１は、楕円ベローズを成形する
ための楕円形素管である。４，５は、前記楕円素管１の
両端をローリング６．７によって圧力シールするととも
に２，３のシリンダーの駆動によって、スピンドル２α
、３αを介して前記楕円素管１の軸方向に圧縮し、８，
９゜１０の上型Ａ、Ｂ、Ｃおよび１１，１２，１３゜の
下型Ａ、Ｂ、Ｃを、移動させることが可能であるシール
型である。また、２．３のシリンダーは取付板２ｂ、３
ｂに固定されている。ここで、８の上型Ａと１１の下型
Ａは成形品を取出すために上下２分割されており、８と
１１，９と１２゜１０と１３を組合せて成形を行なう。An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIGS. 1 to 3, 1 is an elliptical blank tube for forming an elliptical bellows. 4 and 5 pressure-seal both ends of the elliptical tube 1 by rolling 6.7, and drive a spindle 2α by driving the cylinders 2 and 3.
, 3α in the axial direction of the elliptical tube 1, 8,
This is a sealed mold in which upper molds A, B, and C at 9° and 10° and lower molds A, B, and C at 11, 12, and 13° can be moved. Also, the cylinder 2.3 is attached to the mounting plate 2b, 3
It is fixed at b. Here, the upper mold A of 8 and the lower mold A of 11 are divided into upper and lower halves in order to take out the molded product, and molding is performed by combining molds 8 and 11, 9 and 12, 10 and 13.

また、それらはロッド１４．１５の案内によって軸方向
に入ライドできる構造である。さらに、１６は配管２２
によって前記楕円素管１の内に導き、張出し変形を加え
るための油圧である。Moreover, they are constructed so that they can be inserted and ridden in the axial direction by the guidance of rods 14,15. Furthermore, 16 is a pipe 22
This is the hydraulic pressure that is introduced into the elliptical tube 1 to apply overhang deformation.

上記のように構成した９本実施例に係る楕円ベローズの
製造方法についてのべる。A method of manufacturing the elliptical bellows according to nine embodiments configured as described above will be described.

第１〜第３図において２等間かくに配列した８゜８．１
ｏの上型Ａ、Ｂ、Ｃと１１．１２．１３（７）下型Ａ、
Ｂ、Ｃの組合せにより構成される空間に楕円素管１を挿
入し、シリンダー２，３の駆動によってシール型４，５
に設けたローリング６．７によって、楕円素管１の両端
を圧力シールする。8゜8.1 arranged in two equal spaces in Figures 1 to 3
o upper mold A, B, C and 11.12.13 (7) lower mold A,
The elliptical tube 1 is inserted into the space formed by the combination of B and C, and the seal molds 4 and 5 are formed by driving the cylinders 2 and 3.
Both ends of the elliptical blank tube 1 are pressure-sealed by rolling rollers 6.7 provided at.

つぎに、油圧１６を負荷し、第１図に示すように自由張
出し成形を行う。さらに、油圧１６を一定に保持した状
態で、シリンダー２，３を駆動し。Next, a hydraulic pressure 16 is applied to perform free stretch forming as shown in FIG. Furthermore, the cylinders 2 and 3 are driven while the oil pressure 16 is held constant.

シール型４，５を介して、上型８，９，１０．と下型１
１，１２．１３を組合せた状態で軸方向に移動し、ベロ
ーズ山部を順次たたみこんで成形する。シール型４，５
および上型８，９．１０と下型１１，１２．１３の間か
くがなくなり、全てが一体となると、シリンダー２，３
の駆動を停止し。Through the seal molds 4, 5, the upper molds 8, 9, 10. and lower mold 1
1, 12, and 13 are moved in the axial direction in a combined state, and the bellows peaks are sequentially folded and formed. Seal type 4, 5
And when the gap between the upper mold 8, 9.10 and the lower mold 11, 12.13 is eliminated and all are integrated, the cylinders 2, 3
Stop driving.

油圧１６を除荷する。シリンダー２，３を後退し。Unload the hydraulic pressure 16. Move cylinders 2 and 3 back.

成形品を離型する０以上９本実施例により製造された楕
円ベローズ２１を、第４，５図に示す。座屈、破断等の
不良のない良好な成形品でしかも長径部のベローズ山高
さ２１αと短径部のベローズ山高さ２１ｂが、はぼ同様
な楕円ベローズが製造できた。4 and 5 show an elliptical bellows 21 manufactured in accordance with this embodiment. It was possible to manufacture an elliptical bellows which was a good molded product free from defects such as buckling and breakage, and in which the bellows height 21α of the long diameter portion and the bellows height 21b of the short diameter portion were similar to that of the bellows.

具体例についてのべる。I will talk about specific examples.

長径３０ｍ、長径部の曲率半径約４５ｎｍ、長径部の肉
厚３　ｍ、短径１５ｍ、短径部の曲率半径約１５ｍ、短
径部の肉厚１　ｕｓ　、長さ６０ｍ、材質がＳＵＳ　３
　ｌ　ｂの楕円形素管を用いた。ここで、長径部と短径
部の間の肉厚は、肉厚の薄い短径部から長径部に向かっ
て、はぼ比例的に厚くした楕円素管を用いた。前記、楕
円素管を用いて、山部の頂点を結ぶ楕円の長径が３８ｎ
ｒｎ、短径が２３ｏｎ。Long axis 30 m, radius of curvature of major axis approximately 45 nm, wall thickness of major axis 3 m, minor axis 15 m, radius of curvature of minor axis approximately 15 m, wall thickness of minor axis 1 us, length 60 m, material is SUS 3
A lb oval blank tube was used. Here, an elliptical blank tube was used in which the wall thickness between the major diameter part and the minor diameter part was increased almost proportionally from the minor diameter part with the thinner wall thickness toward the major diameter part. The major axis of the ellipse connecting the vertices of the ridges is 38n using the elliptical blank pipe mentioned above.
rn, short axis is 23 on.

ベローズ山高さ４　ｍｍ　、山数４．山のピッチが３ｎ
ｒｎ。Bellows height 4 mm, number of ridges 4. The pitch of the mountain is 3n
rn.

楕円ベローズを製造する方法についてのへる。Information on how to manufacture oval bellows.

油圧を３５０　ｋ　ｇ　ｆ　／　ｃｉ　、シリンダーの
駆動を１．５ｔｆとした。The oil pressure was 350 kgf/ci, and the cylinder drive was 1.5 tf.

上記諸条件を設定して、前記第１〜３図に係る製造方法
により、成形を行ったところ第４．第５図に示すような
良好な楕円ベローズを提供できた。When the above-mentioned conditions were set and molding was carried out according to the manufacturing method according to the above-mentioned FIGS. 1 to 3, 4. A good elliptical bellows as shown in FIG. 5 could be provided.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、以下の効果がある。 According to the present invention, there are the following effects.

１、液圧成形のみで楕円ベローズを製造できる。1. Oval bellows can be manufactured only by hydroforming.

ので、安価な楕円ベローズを提供できる。Therefore, we can provide inexpensive oval bellows.

２、ベローズの山高さが円周方向で、はぼ均一な製造方
法を示す横断面図、第２図は、第１図の八−Ａ’矢視縦
断面図、第３図は９本発明の一実施例の楕円ベローズの
製造に用いる楕円素管の斜視図、第４図は２本発明の一
実施例により製造された楕円ベローズを示す平面図、第
５図は、第４図の正面図である。2. A cross-sectional view showing a manufacturing method in which the height of the bellows is uniform in the circumferential direction. FIG. 2 is a longitudinal cross-sectional view taken along arrow 8-A' in FIG. 1. FIG. FIG. 4 is a perspective view of an elliptical blank tube used for manufacturing an elliptical bellows according to an embodiment of the present invention, FIG. 4 is a plan view showing an elliptical bellows manufactured according to an embodiment of the present invention, and FIG. It is a diagram.

１・・・楕円素管。1...Oval tube.

２・・・／ｌＩ圧シリンダー ４・・・シール型。2.../lI pressure cylinder 4... Seal type.

６−・・ローリング。6-...Rolling.

８・・・上型Ａ。8... Upper mold A.

１１・・下型Ａ。11. Lower mold A.

１６・・・油圧。16...Hydraulic pressure.

２１・・・楕円ベローズ。21...Oval bellows.

第３０ １−・−橋８棄３ ２、−シリンγ ４−”ｙ−ＩＶ型 乙−Ｏ−りン７゜ ８−　　と型Ａ Ｉだ−１型Ａ ！乙−スミ圧。30th 1-・-Bridge 8 Abandoned 3 2, -Syrin γ 4-”y-type IV Otsu-O-rin 7゜ 8- and type A I-type 1 A ! Otsu-Sumi pressure.

刀２聞 １７　　　／４ ／８ ／９ 人夕 ２ρKatana 2nd edition 17 /4 /8 /9 people and evening 2ρ

Claims (1)

【特許請求の範囲】[Claims] １、所定ピッチで配列した上下分割型に挿入した楕円素
管に内圧を加え、自由張出し成形後、軸方向に前記分割
型を移動しベローズ山部を順次成形することで、楕円ベ
ローズを製造する方法において、前記楕円素管の短径部
の肉厚に対して長径部の肉厚を厚くした、へん肉素管を
用いることを特徴とした楕円ベローズの製造方法。1. Apply internal pressure to the elliptical blank tube inserted into upper and lower split molds arranged at a predetermined pitch, and after free stretch molding, move the split mold in the axial direction to sequentially mold the bellows peaks to manufacture elliptical bellows. A method for producing an elliptical bellows, characterized in that the method uses a thin-walled blank tube in which the wall thickness of the long diameter portion of the elliptic blank tube is thicker than the thickness of the shorter diameter portion.