JPH06142792A - Method and device for forming bulge of metallic tube material - Google Patents
Method and device for forming bulge of metallic tube materialInfo
- Publication number
- JPH06142792A JPH06142792A JP4316084A JP31608492A JPH06142792A JP H06142792 A JPH06142792 A JP H06142792A JP 4316084 A JP4316084 A JP 4316084A JP 31608492 A JP31608492 A JP 31608492A JP H06142792 A JPH06142792 A JP H06142792A
- Authority
- JP
- Japan
- Prior art keywords
- metal pipe
- lead
- pipe material
- solid
- mold
- 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
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は金属管材のバルジ成形方
法と、そのための装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulge forming method for a metal pipe material and an apparatus therefor.
【０００２】[0002]
【従来の技術】一般に、バルジ成形方法は発電機や熱交
換器、輸送機器の部品、管継手などの加工に適用されて
おり、その拡管上の圧力媒体としても、液体やゴム、爆
薬などが使われている通例である。2. Description of the Related Art Generally, the bulge molding method is applied to the processing of generators, heat exchangers, parts of transportation equipment, pipe joints, etc., and liquids, rubbers, explosives, etc. are also used as the pressure medium on the pipe expansion. It is the customary one used.
【０００３】[0003]
【発明が解決しようとする課題】ところが、先づ火薬の
爆発エネルギーによるバルジ成形方法の場合、その成形
所要時間が非常に短かく、一工程で大きな塑性変形を得
られるなどの利点がある反面、小型・薄肉品には不向き
であり、金属の特性によって有利な材料に制約があるた
め、大量生産上問題がある。又、高性能の爆薬について
は、その使用や保管などに法的制限を受けると共に、特
別な地域や技術者を用意しなければならない不利もあ
る。However, in the case of the bulge forming method using the explosive energy of explosive, the forming time is very short and there is an advantage that a large plastic deformation can be obtained in one step. It is not suitable for small-sized and thin-walled products, and there is a problem in mass production because the advantageous materials are limited by the characteristics of the metal. Further, there is a disadvantage in that high-performance explosives are subject to legal restrictions on their use and storage, and special areas and engineers must be prepared.
【０００４】次に、ゴムを圧力媒体とするバルジ成形方
法では、そのゴムの消耗が問題となり、３００〜４００
回程度の繰り返し使用によって破壊し始めるので、不経
済である。又、管材に軸圧縮力を加えることが困難であ
るほか、使用中に変形度が変化するため、品質の安定し
た高精度な成形状態を得られず、複雑な形状品や高機能
品の加工に適用し難い。更に、管材の内面に焼き付きや
すいので、その取り出し作業上も甚だ面倒である。Next, in the bulge forming method using rubber as a pressure medium, the consumption of the rubber becomes a problem, and 300 to 400
It is uneconomical because it starts to destroy after repeated use. In addition, it is difficult to apply axial compressive force to the pipe material, and the degree of deformation changes during use, so it is not possible to obtain a highly accurate molded state with stable quality, and it is not possible to process complicated shaped products Difficult to apply to. Furthermore, since the inner surface of the pipe material is easily seized, it is very troublesome to take it out.
【０００５】この点、液圧バルジ成形方法は最も量産向
きであり、従来から広く普及している。しかし、これで
は割り金型を拘束するための加圧力が大となり、そのた
め大容量の型締めシリンダーとその複雑な制御を要し、
管材への圧液供給路やその開口両端部における液密構造
などが不可欠であることとも相俟って、設備費がかなり
高価となる。In this respect, the hydraulic bulge molding method is most suitable for mass production, and has been widely used in the past. However, in this case, the pressing force for restraining the split mold becomes large, which requires a large-capacity mold clamping cylinder and its complicated control.
Combined with the fact that a liquid pressure-tight path to the pipe material and a liquid-tight structure at both ends of the opening are indispensable, the facility cost becomes considerably high.
【０００６】又、管材の軸線方向に沿う両側から圧縮力
を付加するだけであるため、その膨出部のコーナー位置
を小曲率の円弧形状に造形し難く、複雑な形状品や高機
能品の加工には未だ不適当であり、その用途が限定され
る。Further, since the compressive force is only applied from both sides along the axial direction of the pipe material, it is difficult to form the corner position of the bulging portion into an arc shape having a small curvature, and it is possible to obtain a complicated shape product or a highly functional product. It is still unsuitable for processing and its application is limited.
【０００７】[0007]
【課題を解決するための手段】本発明はこのような課題
の抜本的解決を企図しており、そのために金属管材のバ
ルジ成形方法として、金属管材を割り金型のキヤビテイ
へ挿入セツトし、これと相前後してその金属管材の中空
内部に固形の鉛を充填した上、その金属管材の開口一端
部又は開口両端部から上記鉛に圧縮力を付加して、その
鉛の塑性変形作用により金属管材を拡管させることを第
１の特徴とし、SUMMARY OF THE INVENTION The present invention intends to radically solve such a problem. Therefore, as a bulge forming method of a metal pipe, the metal pipe is inserted into a cavity of a split mold and set. A solid lead is filled into the hollow interior of the metal pipe material before and after, and a compressive force is applied to the lead from one end or both ends of the opening of the metal pipe, and the metal is deformed by the plastic deformation action of the lead. The first feature is to expand the pipe material,
【０００８】又、金属管材を割り金型のキヤビテイへ挿
入セツトし、これと相前後してその金属管材の中空内部
に固形の鉛を充填した上、その金属管材の開口一端部又
は開口両端部から上記鉛に圧縮力を付加して、その鉛の
塑性変形作用により金属管材を拡管させると共に、その
後割り金型から取り出した拡管済みの成形品を、加熱装
置により加熱して、その成形品から上記鉛を溶かし出す
ことを第２の特徴とする。Further, the metal pipe material is inserted into the cavity of the split mold, and the hollow interior of the metal pipe material is filled with solid lead before and after the insertion, and one end or both ends of the opening of the metal pipe material is filled. From the above-mentioned lead, a compressive force is applied to the lead to expand the metal pipe material by the plastic deformation action of the lead, and then the expanded product taken out from the split mold is heated by a heating device, The second feature is that the lead is melted out.
【０００９】更に、上記方法を実施するためのバルジ成
形装置として、その構成上目的とする形状のキヤビテイ
を備えた上下一対の割り金型と、その型締めされた割り
金型の開口一端部又は開口両端部に臨む加圧シリンダー
と、金属管材を拡管させるべき圧力媒体としての固形鉛
とから成り、上記割り金型のキヤビテイへ金属管材を挿
入セツトし、これと相前後してその金属管材の中空内部
へ固形の鉛を充填した上、上記加圧シリンダーを割り金
型のパーテイングラインに沿い、金属管材の内部に進出
作動させて、その固形の鉛に軸圧縮力を付加することに
より、上記金属管材を割り金型のキヤビテイに応じた膨
出形状に拡管させるように定めたことを特徴とするもの
である。Further, as a bulge forming device for carrying out the above-mentioned method, a pair of upper and lower split molds having cavities of a desired shape in terms of its structure, and one end portion of an opening of the clamped split molds. It consists of a pressure cylinder facing both ends of the opening, and solid lead as a pressure medium for expanding the metal pipe material, and inserts the metal pipe material into the cavity of the split mold, and before and after this, the metal pipe material After filling solid lead into the hollow interior, along the parting line of the split mold, the pressure cylinder is advanced into the interior of the metal pipe material, and by applying an axial compression force to the solid lead, It is characterized in that the above-mentioned metal pipe material is determined so as to be expanded into a bulging shape according to the cavity of the split mold.
【００１０】[0010]
【作用】上記第１発明のバルジ成形方法によれば、その
金属管材を拡管させるべき圧力媒体として、固形状態で
も自由に塑性変形する柔軟な金属の鉛が採用されている
ため、品質の安定した高精度な成形状態を容易に得ら
れ、複雑な形状品や小型・薄肉品、高機能品の成形にも
一切の制約なく適用実施することができ、大量生産向き
であることはもとより、多品種少量生産上も著しく効果
的である。According to the bulge forming method of the first invention, as the pressure medium for expanding the metal pipe material, the flexible metallic lead that is freely plastically deformed even in the solid state is employed, so that the quality is stable. High-accuracy molding state can be easily obtained, and it can be applied to molding complex shaped products, small / thin-walled products, and high-performance products without any restrictions. It is also extremely effective for small-scale production.
【００１１】又、第２発明のバルジ成形方法によれば、
その鉛の融点は約３２７．４℃であるため、その程度の
加熱作用を付与することにより、拡管後の成形品から固
形の鉛をすばやく、且つ洩れなく溶かし出すことがで
き、ゴムを圧力媒体とするバルジ成形方法のように、そ
の圧力媒体の取り出し上面倒な作業を要しない。According to the bulge forming method of the second invention,
Since the melting point of lead is about 327.4 ° C, by applying such a heating effect, solid lead can be quickly and leak-freely melted from the molded product after pipe expansion, and the rubber is used as a pressure medium. Unlike the bulge forming method described above, taking out the pressure medium does not require an upside down work.
【００１２】更に、第３発明のバルジ成形装置によれ
ば、やはり圧力媒体として固形の鉛が使われているた
め、目的とする成形品に応じた割り金型と、その鉛に圧
縮力を付加する加圧シリンダーがあれば足り、液圧バル
ジ成形方法のように圧液供給路や液密構造などの付帯設
備を一切要さず、設備費が著しく安価になると共に、簡
素な制御のもとに熟練を要さず成形作業し得るのであ
る。Further, according to the bulge molding apparatus of the third invention, since solid lead is also used as the pressure medium, a split mold corresponding to the target molded product and a compressive force is applied to the lead. There is no need for a pressurizing cylinder, and unlike the hydraulic bulge molding method, there is no need for additional equipment such as a pressure liquid supply passage or a liquid-tight structure, which significantly reduces the equipment cost and requires simple control. Therefore, the molding work can be performed without requiring skill.
【００１３】[0013]
【実施例】以下、図面に基いて本発明の詳細を説明する
と、先づ図１〜６はその本発明の第１実施例に係り、口
径が一定な断面円形のありふれたステンレス鋼製直管を
金属管材（Ｍ１）の一例として、これから目的とする中
央位置に紡錘型の膨出部（１０）が拡管された成形品
（Ａ１）と、そのためのバルジ成形装置を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. First, FIGS. 1 to 6 relate to the first embodiment of the present invention, and a common straight pipe made of stainless steel having a circular cross section with a constant diameter. As an example of the metal pipe material (M1), there is shown a molded product (A1) in which a spindle-shaped bulging portion (10) is expanded at a desired center position, and a bulge molding device therefor.
【００１４】（１１）（１２）はそのバルジ成形装置に
おける上下一対の割り金型であり、その型締めによって
画定されるキヤビテイ（Ｓ）が、目的の上記成形品（Ａ
１）と対応する形状を備えていること言うまでもない。
（１３）はその両金型（１１）（１２）の位置決め用ノ
ツクピン、（１４）は同じく型締め用ボルトであるが、
そのボルト（１４）に代るクランプ金具やその他の固定
具を用いても良い。(11) and (12) are a pair of upper and lower split molds in the bulge molding apparatus, and the cavity (S) defined by the mold clamping is the target molded product (A).
It goes without saying that it has a shape corresponding to 1).
(13) is a dowel pin for positioning both molds (11) and (12), and (14) is a mold clamping bolt,
A clamp metal fitting or other fixing tool may be used instead of the bolt (14).
【００１５】又、（１５）（１６）は上記金型（１１）
（１２）の開口両端部（１７）（１８）に臨む向かい合
う一対の加圧シリンダーであり、そのピストンロツド
（１９）（２０）が両金型（１１）（１２）のパーテイ
ングラインに沿い、金型（１１）（１２）に対して進退
自在に作動されるようになっている。Further, (15) and (16) are the mold (11).
A pair of pressurizing cylinders facing each other at both ends (17) and (18) of the opening of (12), the piston rods (19) and (20) of which are located along the parting line of both molds (11) and (12). The molds (11) and (12) can be moved back and forth.
【００１６】この点、図示の実施例では両加圧シリンダ
ー（１５）（１６）を油圧シリンダーとして具体化して
いるが、これに代る空気圧シリンダーや電動シリンダー
などを採用することも可能である。更に、上記ピストン
ロツド（１９）（２０）の先端部には図示省略してある
が、金属管材（Ｍ１）の口径に応じた別個な加圧用アダ
プターを取付け使用することもあり得る。In this respect, although both pressurizing cylinders (15) and (16) are embodied as hydraulic cylinders in the illustrated embodiment, it is also possible to employ pneumatic cylinders or electric cylinders instead of them. Further, although not shown in the drawings, the tip end portions of the piston rods (19) and (20) may be attached with a separate pressurizing adapter according to the diameter of the metal pipe material (M1).
【００１７】上記バルジ成形装置によって目的の成形品
（Ａ１）を成形するに当っては、その素材としての上記
金属管材（Ｍ１）を両金型（１１）（１２）のキヤビテ
イ（Ｓ）へ挿入セツトし、その両金型（１１）（１２）
を型締め状態に固定維持すると共に、上記金属管材（Ｍ
１）の中空内部へ図３、４のように、鉛（２１）の固形
チツプを充填する。In molding the desired molded product (A1) by the bulge molding device, the metal pipe material (M1) as the material is inserted into the cavities (S) of both molds (11) and (12). Set and both molds (11) (12)
The metal pipe material (M
As shown in FIGS. 3 and 4, a solid chip of lead (21) is filled into the hollow interior of 1).
【００１８】そして、引続き図５のように、上記加圧シ
リンダー（１５）（１６）のピストンロツド（１９）
（２０）を金型（１１）（１２）の開口両端部（１７）
（１８）から、金属管材（Ｍ１）の内部へ進出作動させ
ることにより、その鉛（２１）の固形チツプに軸圧縮力
を付与するのである。Subsequently, as shown in FIG. 5, the piston rod (19) of the pressure cylinders (15) and (16) is continued.
(20) the mold (11) (12) opening both ends (17)
From (18), the axial compression force is applied to the solid chip of lead (21) by advancing into the inside of the metal pipe material (M1).
【００１９】そうすれば、上記鉛（２１）の固形チツプ
が金属管材（Ｍ１）に内圧を付加すべく、図６のように
塑性変形し、その金属管材（Ｍ１）を金型（１１）（１
２）のキヤビテイ（Ｓ）に応じた膨出形状として拡管さ
せることとなり、茲に目的とする図１のような成形品
（Ａ１）を得ることができる。Then, the solid chip of the lead (21) is plastically deformed as shown in FIG. 6 in order to apply an internal pressure to the metal pipe material (M1), and the metal pipe material (M1) is molded into the mold (11) ( 1
By expanding the tube into a bulging shape corresponding to the cavity (S) of 2), it is possible to obtain the desired molded article (A1) as shown in FIG.
【００２０】バルジ成形上の圧力媒体として採用された
鉛（２１）は、その固形状態でも柔軟な金属であるた
め、自由自在に塑性変形するが、図１のような目的の成
形品（Ａ１）を成形する場合に、鉛（２１）の固形丸棒
体を金属管材（Ｍ１）の中空内部に充填して、これに軸
圧縮力を付加すると、その固形丸棒体をなす鉛（２１）
の中央部が、放射方向へ均等に展伸し難く、偏心的に膨
出作用することになるため、金属管材（Ｍ１）の局部的
な薄肉化や割れなどを生じるおそれがあり、高品質の成
形品（Ａ１）を得ることができない。The lead (21) used as the pressure medium in the bulge molding is a flexible metal even in its solid state, and thus is freely plastically deformed, but a molded article (A1) for the purpose as shown in FIG. In molding, the solid round bar of lead (21) is filled in the hollow inside of the metal pipe material (M1), and an axial compressive force is applied to the hollow round bar of lead (21) forming the solid round bar.
Since the central portion of the metal tube does not easily spread in the radial direction and eccentrically expands, the metal pipe material (M1) may be locally thinned or cracked, resulting in high quality. A molded product (A1) cannot be obtained.
【００２１】この点、上記成形品（Ａ１）を目的とする
本発明の第１実施例では、その鉛（２１）の言わば輪切
りした固形チツプを用いているため、これを金属管材
（Ｍ１）の中空内部へ充填の上、その金属管材（Ｍ１）
の軸線方向に沿う圧縮力を付加する時には、図６から示
唆される通り、金属管材（Ｍ１）の中央部に位置する鉛
（２１）の固形チツプに対して、同じく両端部から加圧
される別個な固形チツプが、次々と喰い込んで行くと同
時に、放射方向へ逃げる如く展伸することとなる。In this respect, in the first embodiment of the present invention intended for the above-mentioned molded product (A1), since the so-called solid chip of lead (21) is used, it is used as a metal pipe material (M1). After filling the inside of the hollow, the metal pipe material (M1)
When a compressive force is applied along the axial direction of, the solid chip of lead (21) located in the central part of the metal pipe material (M1) is also pressed from both ends, as suggested from FIG. Separate solid chips will bite one after another and at the same time will spread out to escape in the radial direction.
【００２２】そして、各固形チツプの隣り合う境界面
が、金属管材（Ｍ１）の軸線上ではピストンロツド（１
９）（２０）の加圧面と平行面をなすに反し、そのピス
トンロツド（１９）（２０）の加圧面から遠ざかる金属
管材（Ｍ１）の周縁部では、各固形チツプの隣り合う境
界面がピストンロツド（１９）（２０）の加圧面と交叉
する傾斜面をなし、その傾斜面に沿って各固形チツプが
放射方向へ滑り逃げる如く塑性変形するため、バラツキ
のない拡管力を金属管材（Ｍ１）に付与することができ
るのであり、その結果金属管材（Ｍ１）を局部的に薄肉
化してしまったり、まして破裂させてしまったりするお
それがないほか、膨出部（１０）のコーナー位置を小曲
率の円弧形状に造形することや、更にはその膨出部（１
０）の複雑な形状に造形することなども、極めて効率良
く行なえ、高精度な成形品（Ａ１）を得られるのであ
る。Then, the adjacent boundary surfaces of the solid chips are arranged on the piston rod (1) on the axis of the metal pipe material (M1).
9) In the peripheral portion of the metal pipe material (M1) away from the pressing surface of the piston rod (19) (20), which is parallel to the pressing surface of (20), the adjacent boundary surfaces of the solid chips are adjacent to each other. 19) An inclined surface intersecting with the pressure surface of (20) is formed, and each solid chip is plastically deformed along the inclined surface so as to slip and escape in the radial direction, so that a uniform pipe expanding force is imparted to the metal pipe material (M1). As a result, there is no possibility that the metal pipe material (M1) is locally thinned or even ruptured, and the corner position of the bulging portion (10) is an arc of small curvature. The shape and the bulge (1
It is also possible to perform molding in a complicated shape of 0) extremely efficiently and to obtain a highly accurate molded product (A1).
【００２３】但し、鉛（２１）は硬さ−約１．５の柔軟
な金属であり、上記圧縮力を受けるや円滑に塑性変形す
るため、目的とする成形品（Ａ１）の膨出形状如何によ
っては、上記固形チツプのみに限らず、例えば金属管材
（Ｍ１）と対応する長さの固形丸棒体や角棒体などを採
用して、これを金属管材（Ｍ１）の中空内部へ充填する
ことも可能である。However, lead (21) is a soft metal having a hardness of about 1.5, and smoothly plastically deforms when it receives the above-mentioned compressive force. Therefore, the bulging shape of the target molded product (A1) is not determined. Depending on the solid chip, for example, a solid round bar or a rectangular bar having a length corresponding to the metal pipe material (M1) is adopted, and this is filled into the hollow inside of the metal pipe material (M1). It is also possible.
【００２４】又、目的とする成形品（Ａ１）の如何で
は、図７のように加圧シリンダー（１５）としても、割
り金型（１１）（１２）の開口一端部に臨む１基とし
て、その一方のみから金属管材（Ｍ１）の内部に進出作
動させることにより、固形の鉛（２１）に軸圧縮力を付
与することもあり得る。Further, according to the desired molded article (A1), even if the pressure cylinder (15) as shown in FIG. 7 is used as one unit facing the opening one end of the split molds (11) and (12), Axial compressive force may be applied to the solid lead (21) by advancing the inside of the metal pipe material (M1) from only one of them.
【００２５】次に、図８〜１１は本発明の第２実施例と
して、上記第１実施例と異なる成形品（Ａ２）の一例
と、その成形工程を示しているが、これではその目的の
成形品（Ａ２）が断面四角形をなし、且つ全体的な円弧
弯曲型に膨出する特殊形状であるため、上記第１実施例
のようにその素材の金属管材として、市販のありふれた
直管を採用することができない。（２２）はその成形品
（Ａ２）から部分的に膨出するリブである。Next, FIGS. 8 to 11 show, as a second embodiment of the present invention, an example of a molded product (A2) different from that of the first embodiment and the molding process therefor. Since the molded product (A2) has a quadrangular cross section and has a special shape that swells in an overall arc-curved shape, a commercially available straight pipe is used as the metal pipe material of the material as in the first embodiment. Cannot be adopted. Reference numeral (22) is a rib that partially bulges from the molded product (A2).
【００２６】このような場合には、金属平板の板金プレ
ス加工やその他の塑性加工と、溶接などにより、目的の
成形品（Ａ２）に近似した基本形状の予備成形品（Ｍ2
）を一旦粗成形し、その予備成形品（Ｍ２）を金属管
材として、次の工程により目的の成形品（Ａ２）を成形
するのである。（２３）は上記予備成形品（Ｍ2 ）の溶
接継ぎ目を示している。In such a case, a preformed product (M2) having a basic shape similar to the intended product (A2) is obtained by sheet metal press working of a flat metal plate, other plastic working, welding and the like.
2) is once roughly molded, and the preformed product (M2) is used as a metal pipe material to form the desired molded product (A2) in the next step. (23) shows the welded seam of the preform (M2).
【００２７】即ち、鉛（２１）は融点−約３２７．４℃
の柔軟な金属であるため、これを加熱により溶かした溶
液として、図９のように上記予備成形品（Ｍ２）の中空
内部へ流し込み、その後これを自然冷却又は強制冷却に
より、固形状態に硬化させるのである。That is, lead (21) has a melting point of about 327.4 ° C.
Since it is a soft metal, it is poured into the hollow inside of the preform (M2) as shown in FIG. 9 as a solution that is melted by heating, and then it is hardened to a solid state by natural cooling or forced cooling. Of.
【００２８】そして、引続き図１０のように、その固形
鉛（２１）の充填状態にある予備成形品（Ｍ２）を、両
割り金型（１１）（１２）のキヤビテイ（Ｓ）へ挿入セ
ツトして、その両金型（１１）（１２）を型締め状態に
固定保持した上、第１実施例と同様に加圧シリンダー
（１５）（１６）のピストンロツド（１９）（２０）
を、上記金型（１１）（１２）の開口両端部（１７）
（１８）から予備成形品（Ｍ２）の内部へ進出作動させ
て、その固形の鉛（２１）に軸圧縮力を付与する。Then, as shown in FIG. 10, the preform (M2) filled with the solid lead (21) is inserted into the cavity (S) of both split molds (11) and (12) and set. Then, both molds (11) and (12) are fixedly held in the mold clamped state, and the piston rods (19) and (20) of the pressure cylinders (15) and (16) are fixed in the same manner as in the first embodiment.
The opening ends (17) of the molds (11) (12)
(18) is advanced into the interior of the preform (M2) to apply an axial compressive force to the solid lead (21).
【００２９】そうすれば、その鉛（２１）はやはり予備
成形品（Ｍ２）に内圧を付加すべく、図１１のように塑
性変形し、その予備成形品（Ｍ２）を金型（１１）（１
２）のキヤビテイ（Ｓ）に応じた膨出形状として拡管さ
せることとなり、茲に目的とする図８のような全体の円
弧型に弯曲し、且つリブ（２２）の膨出する成形品（Ａ
２）を得ることができるのである。Then, the lead (21) is plastically deformed as shown in FIG. 11 in order to apply an internal pressure to the preform (M2), and the preform (M2) is molded into the mold (11) ( 1
The expanded product has a bulging shape corresponding to the cavity (S) of 2), and is a molded product (A) which is curved to the entire arc shape as shown in FIG.
2) can be obtained.
【００３０】このような本発明の第２実施例によれば、
鉛（２１）の溶液を予備成形品（Ｍ２）の中空内部へ流
し込み、その後硬化した固形状態において、上記予備成
形品（Ｍ２）の軸線方向に沿う圧縮力を付加するように
なっているため、目的とする成形品（Ａ２）の如何に複
雑な膨出形状であっても、これに臨機応変して、高精度
の成形状態を得られる利点があり、図１２〜１６に例示
する各種膨出形状を備えた成形品（Ａ３）〜（Ａ７）の
成形に対処することができる。その図１４〜１６から示
唆されるように、口径の一定しない金属管材（Ｍ１）や
その予備成形品（Ｍ２）からも、本発明のバルジ成形法
によって目的とする成形品（Ａ５）〜（Ａ７）を得られ
ることは、言うまでもない。According to the second embodiment of the present invention as described above,
A solution of lead (21) is poured into the hollow interior of the preform (M2), and then, in a solid state that is cured, a compressive force along the axial direction of the preform (M2) is applied, No matter how complicated the bulging shape of the target molded product (A2) is, there is an advantage that a highly accurate molded state can be obtained by adapting to this, and various bulges illustrated in FIGS. It is possible to deal with the molding of the shaped products (A3) to (A7). As suggested from FIGS. 14 to 16, the target molded products (A5) to (A7) by the bulge molding method of the present invention are also obtained from the metal pipe material (M1) having a non-uniform diameter and its preformed product (M2). It goes without saying that you can get).
【００３１】又、上記金属管材として用いる予備成形品
（Ｍ２）は、その膨出度又は拡管率を見越して、目的と
する成形品の基本形状に粗成形しておくことにより、上
記各種膨出形状の成形品（Ａ２）〜（Ａ７）にやはり対
応し得ることとなる。The preformed product (M2) used as the metal pipe material is roughly bulged into the desired basic shape of the molded product in consideration of the degree of bulging or the expansion ratio of the bulged product. The shaped articles (A2) to (A7) can also be dealt with.
【００３２】上記第１、２実施例の何れにあっても、金
属管材（Ｍ１）やその予備成形品（Ｍ２）から目的とす
る成形品（Ａ１）（Ａ２）を成形し終えたならば、その
金型（１１）（１２）を型開きして、その成形品（Ａ
１）（Ａ２）を金型（１１）（１２）から取り出す。そ
の際、成形品（Ａ１）（Ａ２）の内部には未だ固形の鉛
（２１）が充填状態にあること、言うまでもない。In any of the first and second embodiments described above, if the desired molded products (A1) and (A2) have been molded from the metal pipe material (M1) and its preformed products (M2), The mold (11) (12) is opened and the molded product (A
1) Take out (A2) from the molds (11) and (12). At that time, needless to say, solid lead (21) is still filled inside the molded products (A1) and (A2).
【００３３】そこで、上記取り出した成形品（Ａ１）
（Ａ２）を加熱装置（Ｂ）によって加熱し、その成形品
（Ａ１）（Ａ２）から鉛（２１）を溶かし出すのであ
る。上記のように鉛（２１）の融点は約３２７．４℃で
あるため、その程度の加熱作用を与えることにより、成
形品（Ａ１（Ａ２）から鉛（２１）を瞬時に、且つ洩れ
なく溶かし出すことができ、成形後の面倒な取り出し作
業が不要となる。Then, the molded product (A1) taken out as described above.
(A2) is heated by the heating device (B), and lead (21) is melted out from the molded products (A1) and (A2). As described above, since the melting point of lead (21) is about 327.4 ° C., it is possible to melt the lead (21) from the molded article (A1 (A2) instantly and without leakage by applying a heating action to that extent. It can be taken out, and the troublesome taking-out work after molding is unnecessary.
【００３４】上記加熱装置（Ｂ）としてはガスバーナー
やその他を用いることができるが、図１７のような電気
炉がその炉内の全体的に均一な加熱温度を醸成できる点
で、最適であると言える。（２４）はその電気炉の発熱
体、（２５）は上記成形品（Ａ１）（Ａ２））を支持す
るためのアダプタースタンドであって、炉内へ着脱・交
換自在に据付けられている。A gas burner or the like can be used as the heating device (B), but it is optimal in that the electric furnace as shown in FIG. 17 can produce a uniform heating temperature in the furnace. Can be said. Reference numeral (24) is a heating element of the electric furnace, and reference numeral (25) is an adapter stand for supporting the molded products (A1) and (A2), which is installed in the furnace in a detachable and replaceable manner.
【００３５】そのアダプタースタンド（２５）は図１８
から明白なように、成形品（Ａ１）（Ａ２）と対応する
係止切欠（２６）を備えており、その成形品（Ａ１）
（Ａ２）を立てた姿勢状態として、アダプタースタンド
（２５）の係止切欠（２６）に吊り掛けることにより、
鉛（２１）の溶液を成形品（Ａ１）（Ａ２）から自然落
下させて、その直下位置の容器（２７）に捕集するので
ある。（２８）はその鉛（２１）の溶液を捕集容器（２
７）に案内する漏斗を示している。The adapter stand (25) is shown in FIG.
As is clear from the above, the molded article (A1) and the molded article (A1) are provided with the corresponding locking notches (26).
With (A2) in an upright posture, by hanging it on the locking notch (26) of the adapter stand (25),
The solution of lead (21) is naturally dropped from the molded products (A1) and (A2), and is collected in the container (27) immediately below. (28) is a container (2) for collecting the lead (21) solution.
The funnel leading to 7) is shown.
【００３６】尚、上記アダプタースタンド（２５）は成
形品（Ａ１）（Ａ２）の膨出形状に対応する各種とし
て、予じめ多数作成用意しておくことにより、その交換
使用することができると共に、成形品（Ａ１）（Ａ２）
の膨出部（１０）を利用しつつ、アダプタースタンド
（２５）の上記係止切欠（２６）へ安定良く吊り掛ける
こともでき、著しく便利な治具であると言える。The adapter stand (25) can be used interchangeably by preparing a large number in advance as various types corresponding to the bulging shape of the molded products (A1) and (A2). , Molded products (A1) (A2)
It can be said that the jig is extremely convenient because it can be hung stably on the locking notch (26) of the adapter stand (25) while utilizing the bulging portion (10) of the jig.
【００３７】[0037]
【発明の効果】以上のように、本発明は金属管材のバル
ジ成形方法として、金属管材（Ｍ１）を割り金型（１
１）（１２）のキヤビテイ（Ｓ）へ挿入セツトし、これ
と相前後してその金属管材（Ｍ１）の中空内部に固形の
鉛（２１）を充填した上、その金属管材（Ｍ１）の開口
一端部又は開口両端部から上記鉛（２１）に圧縮力を付
加して、その鉛（２１）の塑性変形作用により金属管材
（Ｍ１）を拡管させるようになっているため、冒頭に述
べた従来技術の課題を悉く解決できる効果がある。INDUSTRIAL APPLICABILITY As described above, according to the present invention, as a bulge forming method for a metal pipe material, the metal pipe material (M1) is divided into molds (1).
1) Insert into the cavity (S) of (12) and, before and after this, fill the hollow inside of the metal pipe material (M1) with solid lead (21) and open the metal pipe material (M1). A compressive force is applied to the lead (21) from one end or both ends of the opening, and the metal pipe material (M1) is expanded by the plastic deformation action of the lead (21). It has the effect of resolving technical issues.
【００３８】即ち、本発明ではバルジ成形上の圧力媒体
として、固形状態でも自由に塑性変形し得る柔軟な金属
の鉛（２１）を用いているため、その危険なく反復使用
できることとも相俟って、大量生産向きであることはも
とより、品質の安定した高精度な成形状態を容易に得ら
れ、小型・薄肉品や複雑な形状品、高機能品の加工につ
いても、その制限なく適用できるほか、請求項６に記載
の極めて単純なバルジ成形装置の構成で足りるのであ
る。That is, in the present invention, since the lead (21), which is a flexible metal that can be freely plastically deformed even in the solid state, is used as the pressure medium for bulge forming, it can be repeatedly used without danger. In addition to being suitable for mass production, it is possible to easily obtain stable and high-precision molding conditions, and it can be applied to the processing of small and thin-walled products, complicated shaped products, and high-performance products without any restrictions. The configuration of the extremely simple bulge forming apparatus according to claim 6 is sufficient.
【００３９】特に、請求項４の構成を採用するならば、
その鉛（２１）が固形チツプとして金属管材（Ｍ１）の
中空内部に充填されるため、その充填作業を容易・円滑
に行なえることはもとより、固形チツプの各個として金
属管材（Ｍ１）の放射方向へ伸展しやすく、その金属管
材（Ｍ１）に均一な拡管力を付与することができ、その
結果金属管材（Ｍ１）の局部的な薄肉化や割れなどを生
ずるおそれがなく、ますます高精度な成形状態を得られ
ることになる。Particularly, if the configuration of claim 4 is adopted,
Since the lead (21) is filled in the hollow inside of the metal pipe material (M1) as a solid chip, the filling work can be performed easily and smoothly, and in addition, the individual radial directions of the metal pipe material (M1) can be obtained as individual solid chips. The metal pipe material (M1) can be easily extended, and a uniform pipe expanding force can be applied to the metal pipe material (M1). As a result, there is no possibility of local thinning or cracking of the metal pipe material (M1), resulting in higher precision. The molded state can be obtained.
【００４０】又、上記圧力媒体の鉛（２１）は加熱によ
り溶融するため、請求項３の構成を採用するならば、如
何に複雑な形状品の成形にも対処でき、その多品種少・
中量生産にも著しく有益となる。Further, since the lead (21) of the pressure medium is melted by heating, if the structure of claim 3 is adopted, it is possible to cope with the molding of complicatedly shaped products, and it is possible to prepare a wide variety of products.
It is also extremely beneficial for medium-volume production.
【００４１】更に、同じく鉛（２１）は加熱により溶融
するので、請求項２の構成を採用することによって、そ
の拡管済みの成形品（Ａ１）（Ａ２）から鉛（２１）を
洩れなく、且つ高能率に溶かし出すことができ、その圧
力媒体の取り出し作業性にも優れ、美麗な成形品（Ａ
１）（Ａ２）を得られる。Further, since the lead (21) is likewise melted by heating, by adopting the structure of claim 2, the lead (21) does not leak from the expanded product (A1) (A2), and It can be melted out with high efficiency, has excellent workability for taking out the pressure medium, and is a beautiful molded product (A
1) (A2) can be obtained.
【００４２】特に、請求項５に記載の通り、加熱装置
（Ｂ）として電気炉を採用するならば、上記拡管済みの
成形品（Ａ１）（Ａ２）に均一な加熱温度を付与するこ
とができると共に、その支持用アダプタースタンド（２
５）に対して、成形品（Ａ１）（Ａ２）を立てた姿勢状
態に吊り掛けることとも相俟って、上記鉛（２１）の溶
かし出し作業をますます能率良く行なえる効果もある。In particular, if an electric furnace is adopted as the heating device (B) as described in claim 5, a uniform heating temperature can be given to the expanded products (A1) and (A2) which have been expanded. Together with its supporting adapter stand (2
In contrast to 5), the molded products (A1) and (A2) are hung in an upright posture, which also has the effect that the work of melting the lead (21) can be performed more efficiently.
【図１】本発明の第１実施例に係る目的成形品を示す斜
面図である。FIG. 1 is a perspective view showing a target molded article according to a first embodiment of the present invention.
【図２】その成形品に対応するバルジ成形装置の型開き
状態を示す一部破断側面図である。FIG. 2 is a partially cutaway side view showing a mold opening state of a bulge molding device corresponding to the molded product.
【図３】同じくバルジ成形装置の型締め状態を示す一部
破断側面図である。FIG. 3 is a partially cutaway side view showing a mold clamping state of the bulge molding apparatus.
【図４】図３の４−４線に沿う拡大断面図である。4 is an enlarged cross-sectional view taken along line 4-4 of FIG.
【図５】加圧シリンダーによる鉛の加圧作用過程を示す
一部破断側面図である。FIG. 5 is a partially cutaway side view showing a process of pressing lead by a pressing cylinder.
【図６】成形品の成形作用状態を示す一部破断側面図で
ある。FIG. 6 is a partially cutaway side view showing a molding operation state of a molded product.
【図７】図６に対応する別異な成形品の成形作用状態を
示す一部破断側面図である。FIG. 7 is a partially cutaway side view showing a molding operation state of another different molded product corresponding to FIG. 6;
【図８】本発明の第２実施例に係る目的成形品を示す斜
面図である。FIG. 8 is a perspective view showing a target molded product according to a second embodiment of the present invention.
【図９】その成形品に対応するバルジ成形装置の型開き
状態を示す一部破断側面図である。FIG. 9 is a partially cutaway side view showing a mold open state of a bulge molding device corresponding to the molded product.
【図１０】同じくバルジ成形装置の型締め状態を示す一
部破断側面図である。FIG. 10 is a partially cutaway side view showing a mold clamping state of the bulge molding apparatus.
【図１１】成形品の成形作用状態を示す一部破断側面図
である。FIG. 11 is a partially cutaway side view showing a molding operation state of a molded product.
【図１２】図１、８と異なる目的成形品の第１変形例を
示す断面図である。FIG. 12 is a cross-sectional view showing a first modified example of the target molded article different from FIGS. 1 and 8.
【図１３】同じく目的成形品の第２変形例を示す断面図
である。FIG. 13 is a sectional view showing a second modified example of the target molded article.
【図１４】目的成形品の第３変形例を示す斜面図であ
る。FIG. 14 is a perspective view showing a third modified example of the target molded article.
【図１５】目的成形品の第４変形例を示す斜面図であ
る。FIG. 15 is a perspective view showing a fourth modified example of the target molded article.
【図１６】目的成形品の第５変形例を示す斜面図であ
る。FIG. 16 is a perspective view showing a fifth modified example of the target molded article.
【図１７】成形品の加熱装置を示す一部破断正面図であ
る。FIG. 17 is a partially cutaway front view showing a heating device for molded articles.
【図１８】成形品支持用のアダプタースタンドを抽出し
て示す斜面図である。FIG. 18 is a perspective view showing an extracted adapter stand for supporting a molded product.
（１１）・割り金型 （１２）・割り金型 （１５）・加圧シリンダー （１６）・加圧シリンダー （１７）・開口両端部 （１８）・開口両端部 （２１）・鉛 （２５）・アダプタースタンド （Ａ１）・成形品 （Ｂ）・加熱装置 （Ｓ）・キヤビテイ （Ｍ１）・金属管材 （Ｍ２）・予備成形品 (11) · Split mold (12) · Split mold (15) · Pressurizing cylinder (16) · Pressurizing cylinder (17) · Opening both ends (18) · Opening both ends (21) · Lead (25) -Adapter stand (A1) -Molded product (B) -Heating device (S) -Cavity (M1) -Metal tube material (M2) -Pre-molded product
Claims (6)
ツトし、これと相前後してその金属管材の中空内部に固
形の鉛を充填した上、 その金属管材の開口一端部又は開口両端部から上記鉛に
圧縮力を付加して、その鉛の塑性変形作用により金属管
材を拡管させることを特徴とする金属管材のバルジ成形
方法。1. A metal pipe material is inserted into a cavity of a split mold, and the hollow inside of the metal pipe material is filled with solid lead in front of and behind the metal pipe material, and one end or both ends of the opening of the metal pipe material is filled. A compressing force is applied to the lead to expand the metal pipe material by the plastic deformation action of the lead.
ツトし、これと相前後してその金属管材の中空内部に固
形の鉛を充填した上、 その金属管材の開口一端部又は開口両端部から上記鉛に
圧縮力を付加して、その鉛の塑性変形作用により金属管
材を拡管させると共に、 その後割り金型から取り出した拡管済みの成形品を、加
熱装置により加熱して、その成形品から上記鉛を溶かし
出すことを特徴とする金属管材のバルジ成形方法。2. A metal pipe is inserted into a cavity of a split mold, and solid lead is filled into the hollow interior of the metal pipe before and after the set, and one end or both ends of the opening of the metal pipe is filled. From the above-mentioned lead, a compressive force is applied to the lead to expand the metal pipe material by the plastic deformation action of the lead, and then the expanded product taken out from the split mold is heated by a heating device, A bulge forming method for a metal pipe material, characterized in that the lead is melted out.
予備成形品として粗成形し、その予備成形品の中空内部
に鉛の溶液を流し込み、その鉛の硬化後に予備成形品を
割り金型のキヤビテイへ挿入セツトすることを特徴とす
る請求項１又は２記載の金属管材のバルジ成形方法。3. Before inserting the metal pipe material into the split mold,
3. A preformed product is roughly molded, a solution of lead is poured into the hollow of the preformed product, and after the lead is hardened, the preformed product is inserted into the cavity of the split mold and set. A method for forming a bulge of a described metal pipe material.
材の中空内部へ充填することを特徴とする請求項１又は
２記載の金属管材のバルジ成形方法。4. The bulge forming method for a metal pipe material according to claim 1, wherein a plurality of chips of solid lead are filled into the hollow interior of the metal pipe material.
の支持用アダプタースタンドを据え付け、そのアダプタ
ースタンドに成形品を立てた姿勢状態として吊り掛ける
ことにより、その成形品から鉛を自然落下状に溶かし出
すことを特徴とする請求項２記載の金属管材のバルジ成
形方法。5. An electric furnace is used as a heating device, an adapter stand for supporting a molded product is installed in the furnace, and the molded product is hung on the adapter stand in an upright posture to naturally lead the molded product. The bulge forming method of a metal pipe material according to claim 2, wherein the bulge forming is carried out by dropping it.
一対の割り金型と、その型締めされた金型の開口一端部
又は開口両端部に臨む加圧シリンダーと、金属管材を拡
管させるべき圧力媒体としての固形の鉛とから成り、 上記金型のキヤビテイへ金属管材を挿入セツトし、これ
と相前後してその金属管材の中空内部へ固形の鉛を充填
した上、 上記加圧シリンダーを金型のパーテイングラインに沿
い、金属管材の内部に進出作動させて、その固形の鉛に
軸圧縮力を付加することにより、上記金属管材を金型の
キヤビテイに応じた膨出形状に拡管させるように定めた
ことを特徴とする金属管材のバルジ成形装置。6. A pair of upper and lower split molds having cavities of a desired shape, a pressure cylinder facing one end or both ends of the opening of the clamped molds, and a metal pipe material to be expanded. It consists of solid lead as a pressure medium, inserts a metal tube into the cavity of the mold, and, before and after this, fills the hollow inside of the metal tube with solid lead and then pressurizes the pressure cylinder. The metal pipe material is expanded along the parting line of the mold to the inside of the metal pipe material, and axial compression force is applied to the solid lead to expand the metal pipe material into a bulging shape according to the cavity of the mold. A bulge forming device for metal pipes characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4316084A JPH0763774B2 (en) | 1992-10-30 | 1992-10-30 | Bulge molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4316084A JPH0763774B2 (en) | 1992-10-30 | 1992-10-30 | Bulge molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06142792A true JPH06142792A (en) | 1994-05-24 |
| JPH0763774B2 JPH0763774B2 (en) | 1995-07-12 |
Family
ID=18073075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4316084A Expired - Fee Related JPH0763774B2 (en) | 1992-10-30 | 1992-10-30 | Bulge molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763774B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092287A (en) * | 1995-12-22 | 2000-07-25 | Daimlerchrysler Ag | Rigid connection of structural parts in the case of a motor vehicle and method for establishing the connection |
| JP2002035852A (en) * | 2000-07-17 | 2002-02-05 | Yamamoto Suiatsu Kogyosho:Kk | Hydroforming unit |
| US6439018B1 (en) | 1998-06-26 | 2002-08-27 | Flow Holdings Gmbh (Sagl) Llc | Device and method for expansion forming |
| US6519855B1 (en) * | 1999-08-31 | 2003-02-18 | Dana Corporation | Method of manufacturing a vehicle body and frame assembly |
| CN101879537A (en) * | 2010-06-21 | 2010-11-10 | 泰州日顺电器发展有限公司 | A kind of method for extrusion molding of lead-free specially shaped copper tubes |
| CN106626331A (en) * | 2015-10-30 | 2017-05-10 | 域鑫科技（惠州）有限公司 | Template and method for machining cucurbit pipe as well as cucurbit pipe obtained through machining with method |
| JPWO2018173575A1 (en) * | 2017-03-21 | 2020-01-23 | 住友重機械工業株式会社 | Molding system and molding method |
| KR20200035914A (en) * | 2017-07-28 | 2020-04-06 | 사노 인더스트리얼 캄파니 리미티드 | Pipe end processing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5973130A (en) * | 1982-10-19 | 1984-04-25 | Takayasu Kogyo Kk | Production of branch pipe for pipe joint |
-
1992
- 1992-10-30 JP JP4316084A patent/JPH0763774B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5973130A (en) * | 1982-10-19 | 1984-04-25 | Takayasu Kogyo Kk | Production of branch pipe for pipe joint |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6092287A (en) * | 1995-12-22 | 2000-07-25 | Daimlerchrysler Ag | Rigid connection of structural parts in the case of a motor vehicle and method for establishing the connection |
| US6439018B1 (en) | 1998-06-26 | 2002-08-27 | Flow Holdings Gmbh (Sagl) Llc | Device and method for expansion forming |
| US6519855B1 (en) * | 1999-08-31 | 2003-02-18 | Dana Corporation | Method of manufacturing a vehicle body and frame assembly |
| JP2002035852A (en) * | 2000-07-17 | 2002-02-05 | Yamamoto Suiatsu Kogyosho:Kk | Hydroforming unit |
| CN101879537A (en) * | 2010-06-21 | 2010-11-10 | 泰州日顺电器发展有限公司 | A kind of method for extrusion molding of lead-free specially shaped copper tubes |
| CN106626331A (en) * | 2015-10-30 | 2017-05-10 | 域鑫科技（惠州）有限公司 | Template and method for machining cucurbit pipe as well as cucurbit pipe obtained through machining with method |
| JPWO2018173575A1 (en) * | 2017-03-21 | 2020-01-23 | 住友重機械工業株式会社 | Molding system and molding method |
| KR20200035914A (en) * | 2017-07-28 | 2020-04-06 | 사노 인더스트리얼 캄파니 리미티드 | Pipe end processing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0763774B2 (en) | 1995-07-12 |
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