JP2003088927A - Hot forming method of tubular member - Google Patents
Hot forming method of tubular memberInfo
- Publication number
- JP2003088927A JP2003088927A JP2001279115A JP2001279115A JP2003088927A JP 2003088927 A JP2003088927 A JP 2003088927A JP 2001279115 A JP2001279115 A JP 2001279115A JP 2001279115 A JP2001279115 A JP 2001279115A JP 2003088927 A JP2003088927 A JP 2003088927A
- Authority
- JP
- Japan
- Prior art keywords
- tubular material
- bending
- forming
- mold
- tubular
- 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
Links
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、管状素材の曲げ加
工を含む熱間成形、もしくは管状素材の拡管（バルジ）
成形と、曲げ成形とを含む熱間成形により、管状素材か
ら所望の形状の管状成形品を得るようにした、管状部材
の熱間成形方法に関し、特に管状素材を、内圧を加える
ことなく曲げ成形して、車両のフレーム部材などに好適
な管状部材を得るようにした、管状部材の成形方法に関
するものである。TECHNICAL FIELD The present invention relates to hot forming including bending of a tubular material, or expansion of a tubular material (bulge).
A hot forming method for a tubular member, wherein a tubular molded product having a desired shape is obtained from a tubular material by hot forming including forming and bending. Particularly, the tubular material is bent without applying internal pressure. Then, the present invention relates to a tubular member forming method for obtaining a tubular member suitable for a frame member of a vehicle.
【０００２】[0002]
【従来の技術】従来、金属製の管状素材を、その長手方
向の適所に拡管部分（バルジ部分）を有する異形断面の
管状部材を成形する、プレス成形方法の一技術手段とし
て、バルジ成形方法が知られている。このバルジ成形方
法は、管状素材がセットされた金型を型閉めした後、そ
の管状素材の内部に、流体圧による内圧を加えてその管
状素材を膨出させて金型のキャビティ面になじませるこ
とにより、所望の形状に成形する成形方法である（たと
えば、図書「プレス作業読本」 日刊工業新聞編昭和４
９年８月３０発行参照）。2. Description of the Related Art Conventionally, a bulge forming method has been used as one technical means of a press forming method for forming a tubular member made of a metal and having a modified cross section having an expanded portion (bulge portion) at a proper position in the longitudinal direction. Are known. In this bulge forming method, after closing the mold in which the tubular material is set, internal pressure due to fluid pressure is applied to the inside of the tubular material so that the tubular material swells and conforms to the cavity surface of the mold. By doing so, it is a molding method for molding into a desired shape (for example, the book “Press Work Reader”, Nikkan Kogyo Shimbun, Showa 4).
See Issued August 30, 1997).
【０００３】また、前記バルジ成形と、曲げプレス成形
とを併用することにより、金属製管状素材を、その長手
方向に異形断面で、かつ側方に曲げられた、所望形状の
管状成形品を得る成形方法も既に知られている（特開平
６−２９２９２９号公報、特開平８−９００９７号公報
参照）。Further, by using the bulge forming and the bending press forming together, a tubular formed article having a desired shape is obtained by bending a metal tubular material in a longitudinal direction with a modified cross section and laterally. A molding method is already known (see JP-A-6-292929 and JP-A-8-90097).
【０００４】[0004]
【発明が解決しようとする課題】ところで、前記バルジ
成形と、曲げ成形とを併用した、従来の管状成形品の成
形方法では、バルジ成形後の、拡管素材（バルジ管素
材）を、上下の金型内の所定位置にセットした後に、そ
の金型の型閉めによりその拡管素材を曲げ成形する方法
が採用されるが、その型閉めによる曲げ成形をする際に
は、その拡管素材内に、加圧流体を供給して内圧を加
え、この内圧を芯金として利用し拡管素材の座屈を防止
しつつその曲げ成形を行うようにした技術手段が採用さ
れる。SUMMARY OF THE INVENTION By the way, in the conventional method for forming a tubular molded product in which the bulge forming and the bending forming are used together, the bulge forming material (bulge pipe material) is replaced with the upper and lower metal parts. A method of bending and forming the tube-expanding material by closing the mold after setting it at a predetermined position in the mold is adopted. A technical means is adopted in which a pressurized fluid is supplied to apply an internal pressure, and this internal pressure is used as a cored bar to prevent the buckling of the pipe expanding material while performing the bending.
【０００５】しかして、加圧流体による内圧を、曲げ成
形時の芯金として利用する場合には、型閉めによる曲げ
成形で、拡管素材はその断面変化により内圧の増加を生
起することから、拡管素材内を一定圧に保つように、流
体圧力をコントロールしないと、拡管素材の断面周長が
増加（拡管素材の肉厚変化）してしまうという、管状成
形品として実用に供するのが難しいという問題がある。However, when the internal pressure of the pressurized fluid is used as the core metal during bending, the pipe expanding material causes an increase in internal pressure due to a change in its cross section during bending by closing the mold. If the fluid pressure is not controlled so as to maintain a constant pressure inside the material, the cross-sectional circumference of the expanded material will increase (the wall thickness of the expanded material will change), making it difficult to put into practical use as a tubular molded product. There is.
【０００６】そこで、この問題を解消するには、加圧流
体として液体（ハイドロフォ−ム）を用いれば、反応性
がよく拡管素材内を一定圧力にコントロールすることが
可能になるが、かかる場合には、前記曲げ成形を冷間成
形で行うことを余儀なくされて非常に高い成形圧力を必
要とし、その結果、大掛かりで高価な成形設備となると
いう別の問題が発生する。Therefore, in order to solve this problem, if a liquid (hydroform) is used as the pressurized fluid, it becomes possible to control the inside of the tube expanding material to a constant pressure with good reactivity. However, the bending forming is forced to be performed by cold forming, and a very high forming pressure is required. As a result, another problem arises in that a large-scale and expensive forming equipment is required.
【０００７】そこで、曲げ成形時の圧力を下げる方法と
して、熱間成形により行う方法も考えられるが、この場
合には、熱間成形であることから拡管素材の内圧を気体
により行うこととなり、該素材内を一定圧力にコントロ
ールすることが、圧縮性流体である気体では困難であ
り、その結果拡管素材の断面周長が増加してしまい所望
の最終管状成形品形状を得るのが困難であるという、さ
らに別の問題がある。Therefore, as a method of lowering the pressure at the time of bending, a method of performing hot forming can be considered. In this case, however, since the hot forming is performed, the internal pressure of the pipe expanding material is performed by gas. It is difficult to control the pressure in the material to a constant pressure with a gas that is a compressive fluid, and as a result, the cross-sectional circumference of the tube expansion material increases, making it difficult to obtain the desired final tubular molded product shape. , There is another problem.
【０００８】本発明はかかる実情に鑑みてなされたもの
であり、独特の熱間成形方法を採用することにより、管
状素材の曲げ成形時に、管状素材に内圧を加えることな
く、曲げ成形を可能にして、成形圧力を大幅に低減し
て、小型で、安価な成形設備により、所望の最終形状の
管状成形品を成形できるようにした、新規な管状部材の
成形方法を提供することを目的とするものである。The present invention has been made in view of the above circumstances, and by adopting a unique hot forming method, it is possible to perform bend forming without applying internal pressure to the tubular material when the tubular material is bent. Thus, it is an object of the present invention to provide a novel tubular member molding method capable of molding a tubular molded product having a desired final shape with a compact and inexpensive molding facility by significantly reducing the molding pressure. It is a thing.
【０００９】[0009]
【課題を解決するための手段】本請求項１記載の発明
は、管状部材の金型による熱間成形方法であって、加熱
された管状素材内に、内圧をかけることなく、加熱され
た曲げ金型の型閉めによる曲げ成形を行う曲げ成形工程
と、内圧を付与して、該管状素材を曲げ金型の成形面に
なじむように矯正成形する矯正成形工程と、矯正成形さ
れた管状素材に気圧による内圧を付与した状態で、この
管状素材を断面成形金型の型閉めにより、その管状素材
をその長手方向と直交する方向から加重を加え、所期の
断面形状に成形する、断面成形工程と含むことを特徴と
しており、かかる特徴によれば、管状部材の熱間成形方
法において、管状素材を金型の型閉めにより曲げ成形す
るにあたり、該管状素材は内圧を加えることなく、熱間
成形されるので、管状素材の断面周長の増加を極力抑
え、その板厚の減少を防止して、該管の曲げ成形を行う
ことが可能であり、しかもその後の矯正成形により管状
素材の座屈などの変形部位の回復が可能であることか
ら、曲げ部位を有する、異形断面の管状部材を高精度を
もって簡単容易に成形することができ、その上、熱間成
形であることから冷間成形に比べて、成形の迅速化、低
成形圧化、成形装置の小型化およびその構造の簡素化な
ど諸効を奏することができる。The invention according to claim 1 is a method for hot forming a tubular member by a mold, wherein the heated tubular material is heated and bent without applying internal pressure. A bending forming step of performing bending forming by closing the die, a straightening forming step of applying an internal pressure to straighten the tubular material so that it fits on the forming surface of the bending die, and a straightened tubular material A cross-section forming step in which the tubular material is molded into the desired cross-sectional shape by applying a load from the direction orthogonal to the longitudinal direction of the tubular material by closing the mold of the cross-section molding die while applying the internal pressure by the atmospheric pressure. According to such a feature, in the hot forming method for a tubular member, when the tubular material is bend-formed by closing the mold, the tubular material is hot-formed without applying an internal pressure. So the tube It is possible to bend the tube by suppressing the increase in the cross-sectional perimeter of the material as much as possible and preventing the reduction of the plate thickness, and the subsequent straightening forming of the deformed portion such as buckling of the tubular material. Since it is possible to recover, it is possible to easily and easily form a tubular member with a deformed cross-section, which has a bent portion, with high precision. It is possible to achieve various effects such as speeding up, low molding pressure, downsizing of a molding apparatus, and simplification of the structure.
【００１０】また、本請求項２記載の発明は、管状部材
の金型による熱間成形方法であって、加熱された管状素
材を、その開口両端部をシールしてその軸方向に圧縮力
を加えつつ、その内部に気圧による内圧を付与し、加熱
された拡管金型の型閉めにより所定部位を拡管成形する
拡管成形工程と、前記拡管成形工程において管状素材内
に付与した内圧を除去した後、加熱された曲げ金型の型
閉めによる曲げ成形を行う曲げ成形工程と、曲げ成形さ
れた管状素材内に気圧による内圧を付与して、該管状素
材の座屈部分を前記曲げ金型の成形面になじむように矯
正成形する矯正成形工程と、矯正成形された管状素材に
気圧による内圧を付与した状態で、この管状素材を断面
成形金型の型閉めにより、その管状素材をその長手方向
と直交する方法から加重を加え、所期の断面形状に成形
する、断面成形工程とを含むことを特徴としており、か
かる特徴によれば、管状部材の熱間成形方法において、
管状素材を金型の型閉めにより、拡管成形（バルジ成
形）後の管状素材を曲げ成形するにあたり、該管状素材
は内圧を加えることなく、熱間成形されるので、管状素
材の断面周長の増加を極力抑え、その板厚の減少を防止
しての、拡管成形（バルジ成形）後の該管の曲げ成形を
行うことが可能であり、しかもその後の矯正成形により
座屈部位の回復が可能であることから、曲げ部位を有す
る、異形断面の拡管（バルジ）管状部材を高精度をもっ
て簡単容易に成形することができ、その上、熱間成形で
あることから冷間成形に比べて、成形の迅速化、低成形
圧化、成形装置の小型化およびその構造の簡素化など諸
効を奏することができる。Further, the invention according to claim 2 is a hot forming method of a tubular member by a die, wherein a heated tubular material is sealed at both ends of its opening, and a compressive force is applied in its axial direction. In addition, while applying an internal pressure due to atmospheric pressure inside the tube, the tube expansion molding step of expanding the predetermined portion by closing the heated tube expansion mold, and after removing the internal pressure applied to the tubular material in the tube expansion molding step. A bending forming step of performing bending forming by closing the heated bending die, and applying an internal pressure by atmospheric pressure to the bending formed tubular material to form a buckling portion of the tubular material of the bending die. In the straightening molding process to straighten the surface to fit the surface, and in the state where the inner pressure by the atmospheric pressure is applied to the straightened tubular material, by closing the tubular material with the cross-section molding die, the tubular material is aligned with its longitudinal direction. Orthogonal way Weight is added and formed into a desired cross-sectional shape, and characterized by including a cross-section forming step, according to this aspect, in the hot forming method of the tubular member,
When the tubular material is bent by the mold closing of the tubular material after the tube expansion molding (bulge molding), the tubular material is hot-formed without applying internal pressure. It is possible to bend the tube after expansion molding (bulge molding) to suppress the increase as much as possible and prevent the plate thickness from decreasing, and it is possible to recover the buckling part by subsequent corrective molding. Therefore, it is possible to easily and easily form a pipe-shaped (bulge) tubular member with a deformed cross-section, which has a bent portion, with high precision. Moreover, since it is hot forming, it can be formed more easily than cold forming. It is possible to achieve various effects such as speeding up, low molding pressure, downsizing of molding apparatus and simplification of its structure.
【００１１】さらに、本請求項３記載の発明は、前記請
求項１または２記載の方法において、前記曲げ成形と、
前記矯正成形とを、同一の金型で行うことを特徴として
おり、かかる特徴によれば、管状素材の曲げ成形および
矯正成形を同じ金型で行うことができることから、前記
請求項１または２記載の発明と同等の効果を奏する上
に、一層の成形の迅速化および成形装置の小型化、構造
の簡素化が可能になる。Further, the invention according to claim 3 is the method according to claim 1 or 2, wherein:
The straightening and the straightening are performed by the same die, and according to the feature, the bending and the straightening of the tubular material can be performed by the same die. Therefore, the straightening and the straightening are performed by the same die. In addition to achieving the same effect as that of the invention, it is possible to further speed up the molding, downsize the molding apparatus, and simplify the structure.
【００１２】[0012]
【発明の実施の形態】本発明の実施の形態を、添付図面
に例示した本発明の実施例に基づいて以下に具体的に説
明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.
【００１３】図１（ａ）および（ｂ）は、拡管（バル
ジ）成形後の管状素材の斜視図および成形完了後の管状
部材の斜視図、図２は本発明にかかる管状部材の熱間成
形方法の成形工程を示す概略図、図３は、拡管（バル
ジ）成形装置の要部縦断側面図、図４は、拡管（バル
ジ）成形装置の型閉め状態を示す拡大部分断面図、図５
は、拡管（バルジ）成形装置の型開き状態を示す拡大部
分断面図、図６は図４および図２の６−６線に沿う拡管
成形金型の断面図、図７は、曲げ成形装置の要部縦断側
面図、図８は、曲げ成形装置の型閉め状態を示す拡大部
分断面図、図９は、図８および図２の９−９線に沿う曲
げ成形金型の断面図、図１０は、矯正成形装置の要部縦
断側面図、図１１は、図１０および図２の１１−１１線
に沿う矯正成形金型の断面図、図１２は、図２の１２−
１２線に沿う断面成形装置の断面図である。1 (a) and 1 (b) are a perspective view of a tubular material after tube expansion (bulge) forming and a perspective view of a tubular member after completion of forming, and FIG. 2 is a hot forming of the tubular member according to the present invention. FIG. 3 is a schematic side view showing a molding step of the method, FIG. 3 is a vertical sectional side view of a main part of the tube expansion (bulge) molding apparatus, and FIG. 4 is an enlarged partial sectional view showing a closed state of the tube expansion (bulge) molding apparatus.
Is an enlarged partial cross-sectional view showing a mold open state of the pipe expanding (bulge) forming device, FIG. 6 is a cross-sectional view of the pipe expanding mold along line 6-6 in FIGS. 4 and 2, and FIG. FIG. 8 is a side view of a longitudinal section of an essential part, FIG. 8 is an enlarged partial sectional view showing a closed state of a bending forming apparatus, and FIG. 9 is a sectional view of a bending forming die taken along line 9-9 in FIGS. 8 and 2. 11 is a vertical cross-sectional side view of a main portion of the correction molding apparatus, FIG. 11 is a cross-sectional view of the correction molding die taken along line 11-11 of FIGS. 10 and 2, and FIG.
It is sectional drawing of the cross-section shaping | molding apparatus which follows the 12th line.
【００１４】この実施例の熱間成形方法で成形される管
状素材Ｐａは、アルミ合金製の、両端を開口した中空円
筒体であり、後述の第１〜第４工程で成形される以前
に、通電加熱工程で約５００°Ｃに加熱される。その加
熱手段Ｈとして、この実施例では通電加熱が採用される
が、これを炉によって加熱するようにしてもよい。The tubular material Pa formed by the hot forming method of this embodiment is a hollow cylindrical body made of an aluminum alloy and having both ends opened, and is formed before the first to fourth steps described later. It is heated to about 500 ° C in the electric heating process. As the heating means H, electric heating is adopted in this embodiment, but it may be heated by a furnace.
【００１５】この実施例にかかる熱間成形方法を列挙す
れば次の通りである。The hot forming methods according to this embodiment are listed below.
【００１６】前記管状素材の、拡管（バルジ）成形工
程（第１工程）、
拡管成形後の、管状素材を内圧を付加することなく曲
げ成形する、曲げ成形工程（第２工程）、
曲げ成形後の管状素材の座屈部分を矯正成形する、矯
正成形工程（第３工程、
矯正成形後の管状素材の断面形状を最終形状に整え成
形する、断面成形工程（第４工程）、
そして、これらの〜の成形工程により、中空円筒上
の管状素材Ｐａ（図１（ａ）鎖線参照）から曲げ部を有
する、異形断面の管状部材Ｐ（図１（ｂ）参照）を熱間
（５００°〜２００°Ｃ）成形する。Tube-expanding (bulge) forming step (first step) of the tubular material, bend-forming step (second step) after tube-expanding forming the tubular material without applying internal pressure, after bending The straightening step of the buckling portion of the tubular material of (3), the straightening step (the third step, the straightening of the tubular material after the straightening shaping into the final shape, the cross-sectioning step (the fourth step), and these By the forming step of ~, a tubular member P (see FIG. 1B) having a deformed cross section having a bent portion from the tubular material Pa on the hollow cylinder (see chain line in FIG. 1A) is hot (500 ° to 200 °). ° C) Mold.
【００１７】次に、前記各工程について順に詳述する。Next, each of the above steps will be described in detail.
【００１８】管状素材の拡管（バルジ）成形工程（第
１工程）
予め約５００°Ｃに加熱された、アルミ合金製の管状素
管（以下に管状素管Ｐａという）は、第１ステーション
ＳＴ１に搬送され、そこで同じく約５００°Ｃに加熱さ
れた、拡管（バルジ）金型、すなわち第１の金型Ｍ１に
投入され、熱間拡管成形（熱間バルジ成形）される。Tube forming (bulge) forming step of tubular material (first step) The tubular tube made of aluminum alloy (hereinafter referred to as tubular tube Pa), which has been preheated to about 500 ° C, is installed in the first station ST1. It is conveyed, and is introduced into a tube expansion (bulge) mold, that is, the first mold M1, which is also heated to about 500 ° C., and is subjected to hot tube expansion molding (hot bulge molding).
【００１９】図３〜５に明瞭に示すように、第１の金型
装置の第１の金型Ｍ１は、基台１上に固定の下金型２
と、その上を、昇降シリンダ４の作動により昇降作動制
御される上金型３とよりなり、下金型２の上面には、管
状素材Ｐａの下側半部を成形するための下型成形面２ｍ
が形成され、また上金型３の下面には、管状素材Ｐａの
上側半部を成形するための上型成形面３ｍが形成され、
第１の金型Ｍ１を型閉めしたとき、それらの成形面２
ｍ、３ｍによりキャビティ５が形成される。第１の金型
Ｍ１の左右両側には、管状素材Ｐａの両端部を固定する
ためのホールド手段Ｈ１が設けられる。このホールド手
段Ｈ１は、第１金型Ｍ１の左右に、左右ホルダ６，７を
備えており、これらのホルダ６，７は、第１の金型Ｍ１
に対して進退移動が可能であり、基台１上に設けたガイ
ド８，９上をアクチュエータ１０，１１の作動により移
動制御される。そして左右ホルダ６，７の前進により、
管状素材Ｐａの両端部は、左右ホルダ６，７の支持孔６
ａ，７ａに嵌合、固定される。As clearly shown in FIGS. 3 to 5, the first mold M1 of the first mold device is a lower mold 2 fixed on the base 1.
And an upper mold 3 which is controlled to move up and down by the operation of the lifting cylinder 4, and a lower mold for molding the lower half of the tubular material Pa on the upper surface of the lower mold 2. 2m surface
Is formed on the lower surface of the upper mold 3, and an upper mold molding surface 3m for molding the upper half of the tubular material Pa is formed.
When the first mold M1 is closed, its molding surface 2
The cavity 5 is formed by m and 3 m. Hold means H1 for fixing both ends of the tubular material Pa are provided on both left and right sides of the first mold M1. The holding means H1 is provided with left and right holders 6, 7 on the left and right of the first mold M1, and these holders 6, 7 are the first mold M1.
It is possible to move forward and backward with respect to the guides 8 and 9 provided on the base 1, and the movement is controlled by the operation of the actuators 10 and 11. And by the forward movement of the left and right holders 6, 7,
Both ends of the tubular material Pa have support holes 6 for the left and right holders 6, 7.
It is fitted and fixed to a and 7a.
【００２０】また、第１の金型Ｍ１の左右両側には、そ
こにセットされた管状素材Ｐａを軸方向から押圧するた
めの押圧手段Ｐ１が設けられる。この押圧手段Ｐ１は、
左右押圧シリンダ１２，１３を有しており、これらの押
圧シリンダ１２，１３のロッド部１２ｒ，１３ｒの先部
に固定される押圧部材１６，１７は、前記左右ホルダ
６，７の支持孔６ａ，７ａ内に進退自在に嵌入されてお
り、左右押圧シリンダ１２，１３の伸長作動によれば、
押圧部材１６，１７の先端が、管状素材Ｐａの両端にそ
れぞれ係合し、引き続く押圧部材１６，１７の前進作動
により、管状素材Ｐａをその両端から軸方向に押圧する
ことができる。Pressing means P1 for axially pressing the tubular material Pa set therein are provided on both the left and right sides of the first mold M1. This pressing means P1 is
The left and right pressing cylinders 12 and 13 are provided, and the pressing members 16 and 17 fixed to the tips of the rod portions 12r and 13r of these pressing cylinders 12 and 13 are the support holes 6a of the left and right holders 6 and 7, respectively. It is fitted in 7a so as to be able to move forward and backward, and according to the extension operation of the left and right pressing cylinders 12 and 13,
The tip ends of the pressing members 16 and 17 are engaged with both ends of the tubular material Pa, respectively, and the tubular material Pa can be axially pressed from both ends thereof by the subsequent forward movement of the pressing members 16 and 17.
【００２１】左右の押圧部材１６，１７と支持孔６ａ，
７ａ間、およびこれらの支持孔６ａ，７ａと管状素材Ｐ
の両端部外周面間には、それぞれシール手段Ｓ１として
のＯリング１９，２０が設けられ、これらのＯリング１
９，２０は、押圧部材１６，１７が管状素材Ｐａに係合
したとき、該管状部材Ｐａと、ホルダ６，７および押圧
部材１６，１７間を気密にシールすることができる。Left and right pressing members 16 and 17 and supporting holes 6a,
Between 7a, and these supporting holes 6a, 7a and tubular material P
O-rings 19 and 20 serving as sealing means S1 are provided between the outer peripheral surfaces of both ends of the O-ring 1 respectively.
When the pressing members 16 and 17 are engaged with the tubular material Pa, the members 9 and 20 can hermetically seal the tubular member Pa, the holders 6 and 7, and the pressing members 16 and 17, respectively.
【００２２】第１の金型Ｍ１の左右両側には、管状素材
Ｐａ内を加圧するための圧縮エア供給手段Ａ１が設けら
れる。この圧縮エア供給手段Ａ１は、圧縮エア供給源２
２から圧縮エア回路２３および押圧部材１６，１７に穿
設したエア導入路２４を経て、管状素材Ｐａの密閉の中
空部に圧縮エアを圧送するように構成されている。Compressed air supply means A1 for pressurizing the inside of the tubular material Pa is provided on both left and right sides of the first die M1. This compressed air supply means A1 is a compressed air supply source 2
The compressed air is pressure-fed to the closed hollow portion of the tubular material Pa from the compressed air circuit 23 and the air introduction path 24 formed in the pressing members 16 and 17.
【００２３】第１ステーションＳＴ１において、予め約
５００°Ｃに加熱された管状素材Ｐａは、同じく約５０
０°Ｃに加熱された第１の金型Ｍ１内に投入してそこに
セットしてから、型閉めシリンダすなわち昇降シリンダ
４の作動により、該第１の金型Ｍ１の型閉めを行う。管
状素管Ｐａの両端部を左右ホルダ６，７の前進により固
定（図４参照）したのち、押圧シリンダ１２，１３を伸
長作動すれば、そのロッド部１２ｒ，１３ｒが管状素材
Ｐａを軸方向に押し込み、軸押しを行いながら、圧縮エ
ア源２２から圧縮エア供給路２３、エア導入路２４を経
て管状素材Ｐａ内に、加圧エアを圧送して、該管状素材
Ｐａに内圧を加えれば、管状素材Ｐａは、キャビティ５
の上、下成形面３ｍ，２ｍになじむように拡管成形（バ
ルジ成形）される。In the first station ST1, the tubular material Pa previously heated to about 500 ° C. is also about 50
The mold is closed in the first mold M1 heated to 0 ° C. and set therein, and then the mold closing cylinder, that is, the lifting cylinder 4 is operated to close the first mold M1. After fixing both ends of the tubular raw pipe Pa by advancing the left and right holders 6 and 7 (see FIG. 4), when the pressing cylinders 12 and 13 are extended, the rod portions 12r and 13r axially move the tubular material Pa to the axial direction. While pushing and axially pushing, pressurized air is pressure-fed into the tubular material Pa from the compressed air source 22 through the compressed air supply passage 23 and the air introduction passage 24 to apply an internal pressure to the tubular material Pa. Material Pa is cavity 5
Tube expansion molding (bulge molding) is performed so as to fit the upper and lower molding surfaces 3 m and 2 m.
【００２４】この場合、前記拡管（バルジ）成形は、熱
間（約５００°Ｃ）で行われるので、その成形圧は、冷
間成形に比べて低い。In this case, since the tube expansion (bulge) forming is performed hot (about 500 ° C.), the forming pressure is lower than that in cold forming.
【００２５】拡管成形後の、管状素材（以下に管状素材
Ｐｂという）は、図１（ａ）、図２に示すように、左右
ホルダ６，７の後退後の、第１の金型Ｍ１の型開きによ
り、そこから取り出され、その中央部の径大円筒部２６
と、そこから左右に続く先細りの左右截頭円錐部２７
と、それらから続く未拡管成形（未バルジ成形）の円筒
端部２８とを有する形状に拡管成形（バルジ成形）され
る。As shown in FIGS. 1 (a) and 2, the tubular material (hereinafter referred to as the tubular material Pb) after the pipe expansion molding has the left and right holders 6 and 7 retracted from the first mold M1. It is taken out from the mold by opening the mold, and the large-diameter cylindrical portion 26 at the center thereof
And the left and right tapered frustoconical portions 27 that continue to the left and right from there
And pipe expansion molding (bulge molding) into a shape having a cylindrical end portion 28 that has not been expanded yet (unbulged).
【００２６】曲げ成形工程（第２工程）
この第２工程は、前工程で拡管成形後の、管状素材Ｐｂ
を曲げ成形する曲げ成形工程であって、この工程は、こ
の実施例の特徴である、管状素材Ｐｂ内に内圧をかける
ことなく曲げ成形する工程である。Bending Forming Step (Second Step) In this second step, the tubular material Pb after the pipe expansion forming in the previous step is formed.
Is a bending forming step of bending, which is a characteristic of this embodiment, and is a bending forming step without applying an internal pressure to the tubular material Pb.
【００２７】前記第１工程にて拡管成形（バルジ成形）
された管状素材Ｐｂは、加熱状態を保ったまま、図示し
ない公知の搬送手段により第２ステーションＳＴ２へと
搬送され、第２の金型Ｍ２に投入され、ここで、内圧を
かけずに熱間（約５００°Ｃ）曲げ成形が行われる。Tube expansion molding (bulge molding) in the first step
The tubular material Pb thus formed is conveyed to the second station ST2 by a well-known conveying means (not shown) while being kept in a heated state, and is introduced into the second mold M2, where hot pressure is applied without applying internal pressure. Bending is performed (about 500 ° C.).
【００２８】前記第２の金型装置は、実質的に前記第１
の金型装置と比べて前記押圧手段Ｐ１が省略され、基台
２０１上に固定の下金型２０２と、その上を、昇降シリ
ンダ２０４の作動により昇降作動制御される上金型２０
３とを備えてなり、下金型の上面には、管状素材Ｐｂの
下側半部を曲げ成形するための下型成形面２０２ｍが形
成され、また上金型２０３の下面には、管状素材Ｐｂの
上側半部を曲げ成形するための上型成形面２０３ｍが形
成され、第２の金型Ｍ２を型閉めしたとき、それらの成
形面によりキャビティ２０５が形成される。第２の金型
Ｍ２の左右両側には第１の金型Ｍ１と同じく、管状素材
Ｐｂの両端を固定するためのホールド手段Ｈ２が設けら
れ、このホールド手段Ｈ２は、左右ホルダ２０６，２０
７を備え、これらのホルダ２０６，２０７は、伸縮シリ
ンダよりなるアクチュエータ２１０，２１１により第２
の金型Ｍ２に対して進退移動制御される。ホルダ２０
６，２０７の支持孔２０６ａ，２０７ａには管状素材Ｐ
ｂの開口両端を気密にシールをするための、Ｏリング２
１９よりなるシール手段Ｓ２が設けられる。The second mold device is substantially the same as the first mold device.
The pressing means P1 is omitted as compared with the above-mentioned mold device, the lower mold 202 fixed on the base 201, and the upper mold 20 whose upper and lower operations are controlled by the operation of the lifting cylinder 204.
3, a lower mold forming surface 202m for bending the lower half of the tubular material Pb is formed on the upper surface of the lower mold, and a tubular material is formed on the lower surface of the upper mold 203. An upper mold molding surface 203m for forming the upper half of Pb by bending is formed, and when the second mold M2 is closed, these molding surfaces form a cavity 205. Like the first die M1, the holding means H2 for fixing both ends of the tubular material Pb is provided on the left and right sides of the second die M2, and the holding means H2 includes the left and right holders 206, 20.
7, the holders 206 and 207 are moved to the second position by the actuators 210 and 211 formed of telescopic cylinders.
The movement of the mold M2 is controlled. Holder 20
The tubular material P is provided in the support holes 206a and 207a of 6,207.
O-ring 2 for airtightly sealing both ends of the b opening
A sealing means S2 consisting of 19 is provided.
【００２９】なお、この第２の金型Ｍ２の両側のホルダ
２０６，２０７にも圧縮エア供給手段Ａ２（後述の第３
工程の矯正成形時に使用）が付設されるが、この第２工
程、すなわち曲げ工程では、管状素材Ｐｂに内圧を加え
ることなく、管状素材Ｐｂの曲げ成形が行われるので、
圧縮エア供給手段Ａ２が作動することがない。The holders 206 and 207 on both sides of the second mold M2 are also provided with the compressed air supply means A2 (the third-described third part).
(Used during the straightening process of the step) is attached, but in this second step, that is, the bending step, the tubular material Pb is bent and formed without applying an internal pressure to the tubular material Pb.
The compressed air supply means A2 does not operate.
【００３０】この第２工程では、約５００°Ｃに加熱さ
れた第２の金型Ｍ２内に、前工程にて未だ加熱状態にあ
る拡管成形（バルジ成形）後の管状素材Ｐｂを、型開き
状態の第２の金型Ｍ２内に投入してそこにセットする。
その後、アクチュエータ２１０の作動により、左右ホル
ダ２０６，２０７を前進作動させて管状素材Ｐｂの両端
部を第２の金型Ｍ２にホールドするとともに、その開口
端をシール手段Ｓ２により気密にシールする（次の第３
工程で管状素材Ｐｃに内圧をかけるために必要）型閉め
シリンダ２０４の作動による上金型２０３の下降によ
り、第２の金型Ｍ２の型閉めを行い、これにより拡管
（バルジ）成形後の管状素管Ｐｂを、上、下金型２０
３，２０２の曲げ成形面２０３ｍ，２０２ｍに沿って熱
間（約５００°Ｃ）での曲げ成形を行う。In the second step, the tubular material Pb after the tube expansion molding (bulge molding), which is still in the heating state in the previous step, is opened in the second mold M2 heated to about 500 ° C. It is put into the second mold M2 in the state and set there.
After that, the left and right holders 206 and 207 are moved forward by the operation of the actuator 210 to hold both ends of the tubular material Pb in the second mold M2, and the opening ends thereof are hermetically sealed by the sealing means S2 (next). The third
(Necessary to apply internal pressure to the tubular material Pc in the process) By lowering the upper mold 203 by operating the mold closing cylinder 204, the mold of the second mold M2 is closed, whereby the pipe after bulge forming The upper and lower molds 20 for the raw pipe Pb
Bend forming is performed hot (about 500 ° C.) along the bend forming surfaces 203m and 202m of 3,202.
【００３１】ところで、この曲げ成形時において、特筆
すべきは、拡管（バルジ）後の管状素材Ｐｂ内には、内
圧を加えないで熱間成形することであり、これにより、
管状素材Ｐｂの断面周長の増加を極力抑えての、該管Ｐ
ｂの曲げ成形を行うことが可能であり、しかも熱間成形
であることから冷間成形に比べて、成形の迅速化、低成
形圧化、成形装置の小型化および構造の簡素化などの多
くの利点が得られる。By the way, it is noteworthy at the time of this bending forming that the tubular material Pb after the pipe expansion (bulging) is hot-formed without applying any internal pressure.
The tubular material Pb that suppresses an increase in the sectional circumference of the tubular material Pb as much as possible
Since it is possible to perform the bending molding of b and it is hot forming, compared to cold forming, there are many things such as faster forming, lower forming pressure, downsizing of forming equipment and simplification of structure. The advantages of
【００３２】しかして、拡管後の、管状素材Ｐｂ内に
は、内圧を加えないことから、前記の曲げ成形時に曲げ
成形部分の一部が潰されて図８，９に示すように座屈変
形するのを避けられないので、この座屈部位ｂは、次工
程の矯正成形にて、曲げ成形面になじむ形状に復元させ
る。However, since no internal pressure is applied to the tubular material Pb after the pipe has been expanded, a part of the bend-formed portion is crushed during the above-mentioned bend forming, and buckling deformation occurs as shown in FIGS. Since it is unavoidable that this occurs, this buckling portion b is restored to a shape that conforms to the bending molding surface in the correction molding in the next step.
【００３３】矯正成形工程（第３工程）
前工程での曲げ成形後の、拡管、曲げ成形後の管状素材
（以下、管状素材Ｐｃという）の座屈部位ｂを矯正成形
する矯正成形工程は、前記第２工程を行う第２のステー
ションＳＴ２にて、約５００°Ｃに保持された第２の金
型Ｍ２を用いて熱間にて行われる。すなわち、曲げ成形
を終了した拡管、曲げ後の管状素材Ｐｃは、第２の金型
Ｍ２にセットした状態のまま、図１１に示すように、上
金型２０３の上昇制御により、該第２の金型Ｍ２の所定
量の型開きを行い、この状態にて、前記第１工程と同じ
要領にて、圧縮エア供給手段Ａ２、すなわち、圧縮エア
源２２２、圧縮エア回路２２３および一方（右側）のホ
ルダ２０７に穿設したエア導入路２２４を通して拡管、
曲げ後の、管状素材Ｐｃ内に、加圧エアを圧送して、該
管状素材Ｐｃに内圧を加えれば、管状素材Ｐｃの座屈部
位ｂは、第２の金型の曲げ成形面の形状になじんで復元
矯正される。Corrective forming step (third step) The corrective forming step of correcting the buckling portion b of the tubular material (hereinafter referred to as the tubular material Pc) after the pipe is expanded and bent after the bend forming in the previous step is performed. In the second station ST2 for performing the second step, the second mold ST2 is used to perform hot working using the second mold M2 held at about 500 ° C. That is, the tubular material Pc after the expansion and bending after bending and forming is kept in the state of being set in the second mold M2, as shown in FIG. The mold M2 is opened by a predetermined amount, and in this state, the compressed air supply means A2, that is, the compressed air source 222, the compressed air circuit 223 and one (the right side) of the compressed air supply means A2 are opened. Pipe expansion through an air introduction path 224 formed in the holder 207,
When pressurized air is pumped into the tubular material Pc after bending and an internal pressure is applied to the tubular material Pc, the buckling portion b of the tubular material Pc becomes the shape of the bending molding surface of the second mold. Familiarity is restored and corrected.
【００３４】断面成形工程（第４工程）
この工程は、矯正成形後の管状素材Ｐｃを最終の断面形
状に整え成形する断面成形工程であって、前記第１〜３
工程にて拡管成形（バルジ成形）、曲げ成形および矯正
成形された、管状素材（以下、管状素材Ｐｄという）
は、加熱状態を保ったまま、図示しない公知の搬送手段
により第３ステーションＳＴ３へと搬送され、第３の金
型Ｍ３に投入され、前記断面成形工程が行われる。Cross Section Forming Step (Fourth Step) This step is a cross section forming step in which the tubular material Pc after the straightening forming is formed into the final cross section shape and is formed.
Tubular material (hereinafter referred to as tubular material Pd) that has been expanded (bulge molding), bent and straightened in the process
While being kept in a heated state, is conveyed to a third station ST3 by a well-known conveying means (not shown), is charged into a third mold M3, and the cross-section forming step is performed.
【００３５】第３の成形装置の前記第３の金型Ｍ３は、
実質的に前記第２の金型Ｍ２と同じ構造のものであり、
固定の下金型３０２と、その上を昇降作動制御される上
金型３０３とよりなり、下金型３０２の上、下面には、
管状素材Ｐｄを断面成形する上、下型成形面３０２ｍ，
３０３ｍが形成され、この第３の金型Ｍ３を型閉めした
とき、それらの成形面３０２ｍ，３０３ｍにより断面成
形用のキャビティ３０５が形成される。第３の金型Ｍ３
の左右両側には第２の金型Ｍ２と同じく、管状素材Ｐｄ
の両端を固定するための左右ホルダがそれぞれ設けら
る。また、前記左右ホルダには、前記第１の金型Ｍ１と
同じく、管状素材Ｐｄの開口両端シールをするための左
右シール手段が設けられ、これらのシール手段はホルダ
と管状素材Ｐｄ端部間をシールするシール手段部材が設
けられ、さらに前記左右ホルダには、前記第２の金型Ｍ
２と同じく圧縮エア供給手段が設けられている。The third mold M3 of the third molding apparatus is
It has substantially the same structure as the second mold M2,
It consists of a fixed lower mold 302 and an upper mold 303 that is controlled to move up and down. The upper and lower surfaces of the lower mold 302 are
When the tubular material Pd is cross-sectionally molded, the lower mold molding surface 302m,
When the third mold M3 is closed, the molding surfaces 302m and 303m form a cavity 305 for molding a cross section. Third mold M3
On both left and right sides of the same as the second mold M2, the tubular material Pd
Left and right holders are provided to fix both ends of. Also, the left and right holders are provided with left and right sealing means for sealing both ends of the opening of the tubular material Pd, like the first mold M1, and these sealing means are provided between the holder and the ends of the tubular material Pd. A sealing means member for sealing is provided, and further, the left and right holders are provided with the second mold M.
Similar to 2, compressed air supply means is provided.
【００３６】なお、前記左右ホルダ、シール手段、およ
び圧縮エア供給手段は、第２の金型Ｍ２のものと同じで
あるので、その説明を省略する。Since the left and right holders, the sealing means, and the compressed air supply means are the same as those of the second mold M2, the description thereof will be omitted.
【００３７】前記第３の金型Ｍ３は約２００°Ｃに保持
される。この第３の金型Ｍ３での前記第２、第３工程に
て、曲げ、矯正成形された管状素材Ｐｄは、前工程で未
だ加熱状態（約５００°Ｃにて成形）にあるため、この
管状素材Ｐｄを、この第３の金型Ｍ３に投入した際に
は、管状素材Ｐｄからの熱が該第３の金型Ｍ３に伝わ
り、その金型温度が上昇するので、逆に管状素材Ｐｄの
温度を下げるようにコントロールされる。これにより管
状素材Ｐｄは、第３の金型Ｍ３からの熱の影響をうけて
変形することが防止され、しかも管状素材Ｐｄは第３の
金型Ｍ３で冷却されて最終形状に成形されるので、第３
の金型Ｍから取り出した際に自然放冷などの外的条件を
受けることがなく、その結果、精度のバラツキがない、
高精度、高品質の管状部材Ｐの成形が可能になる。The third mold M3 is held at about 200 ° C. Since the tubular material Pd bent and straightened in the second and third steps in the third mold M3 is still in the heated state (molded at about 500 ° C.) in the previous step, this When the tubular material Pd is charged into the third mold M3, heat from the tubular material Pd is transferred to the third mold M3 and the mold temperature rises. Is controlled to lower the temperature. As a result, the tubular material Pd is prevented from being deformed under the influence of heat from the third mold M3, and the tubular material Pd is cooled by the third mold M3 to be formed into the final shape. , Third
When it is taken out from the mold M, it is not subjected to external conditions such as natural cooling, and as a result, there is no variation in accuracy.
It is possible to mold the tubular member P with high accuracy and high quality.
【００３８】第３ステーションＳＴ３に搬送された、曲
げおよび矯正後の管状素材Ｐｄは、該第３ステーション
ＳＴ３にて、図示しない回転手段により、その軸線Ｌ−
Ｌ（図２参照）回りに略９０°回転（その回転角は、管
状素材Ｐｄにより異なる）してから型開き状態の第３の
金型Ｍ３内に投入する。その後、ホルダの前進作動によ
り管状素材Ｐｄの両端部を第３の金型Ｍ３に固定すると
ともに管状素材Ｐｄの両端部をシールし、ホルダを前進
させる。ここで、型閉めシリンダの作動による上金型３
０３の下降により、該第３の金型Ｍ３の型閉めを行い、
圧縮エア供給手段により管状素材Ｐｄ内に内圧を加え
て、この状態の管状素材Ｐｄに、その長手方向より直交
する方向からの加重を加え、その断面を潰して、上、下
金型３０２，３０３の成形面に馴染むように所望形状に
整える断面成形を行い、成形を完了した管状部材Ｐ（図
１（ｂ）参照）を得る。The bent and straightened tubular material Pd, which has been conveyed to the third station ST3, has its axis L-
It is rotated about 90 ° around L (see FIG. 2) (the rotation angle varies depending on the tubular material Pd) and then charged into the third mold M3 in the mold open state. Then, both ends of the tubular material Pd are fixed to the third mold M3 by the forward movement operation of the holder, and both ends of the tubular material Pd are sealed to advance the holder. Here, the upper mold 3 by the operation of the mold closing cylinder
03, the third mold M3 is closed,
Internal pressure is applied to the tubular material Pd by the compressed air supply means, and a weight is applied to the tubular material Pd in this state from a direction orthogonal to its longitudinal direction, the cross section is crushed, and the upper and lower molds 302 and 303 are crushed. A cross-section is formed into a desired shape so as to fit the molding surface of (1) to obtain a tubular member P (see FIG. 1 (b)) that has been completed.
【００３９】このとき、管状部材Ｐの最終形状が三次元
形状の場合には、曲げ成形も同時に行われる。At this time, if the final shape of the tubular member P is a three-dimensional shape, bending is also performed at the same time.
【００４０】前記断面成形後、第３の金型Ｍ３の型開き
して、図１に示す管状部材Ｐを取り出してその成形を終
了する。After the cross-section molding, the third mold M3 is opened, the tubular member P shown in FIG. 1 is taken out, and the molding is completed.
【００４１】しかして、前記第１〜第４工程により成形
された成形完了管状部材Ｐは、車両のフレーム部材など
に使用される。The completed tubular member P formed by the first to fourth steps is used as a frame member of a vehicle.
【００４２】以上、本発明の一実施例について説明した
が、本発明はその実施例に限定されることなく、本発明
の範囲内で種々の実施例が可能である。Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment and various embodiments are possible within the scope of the present invention.
【００４３】たとえば、前記実施例では、本発明の成形
方法をアルミ合金製の管状部材に実施した場合について
説明したが、これを他の金属製管状部材の成形にも実施
できることは勿論であり、この場合に管状部材の材質な
どに応じて、該管状素材および金型の加熱温度がコント
ロールされる。また、この実施例では、管状素材に内圧
を加える圧縮性流体にエアを用いているが、他の同効の
気体を用いてもよい。For example, in the above-mentioned embodiment, the case where the molding method of the present invention is applied to the tubular member made of aluminum alloy has been described, but it goes without saying that this can be applied to the molding of other metallic tubular members. In this case, the heating temperature of the tubular material and the mold is controlled according to the material of the tubular member. Further, in this embodiment, air is used as the compressive fluid that applies internal pressure to the tubular material, but other effective gases may be used.
【００４４】[0044]
【発明の効果】以上のように本請求項１記載の発明によ
れば、管状部材の熱間成形方法において、管状素材を金
型の型閉めにより曲げ成形するにあたり、該管状素材は
内圧を加えることなく、熱間成形されるので、管状素材
の断面周長の増加を極力抑え、その板厚の減少を防止
し、該管の曲げ成形を行うことが可能であり、しかもそ
の後の矯正成形により座屈などの変形部位の回復が可能
であることから、曲げ部分を有する、異形断面の管状部
材を高精度をもって簡単容易に成形することができ、そ
の上、熱間成形であることから冷間成形に比べて、成形
の迅速化、低成形圧化、成形装置の小型化およびその構
造の簡素化など諸効を奏することができる。As described above, according to the first aspect of the present invention, in the hot forming method for a tubular member, when the tubular material is bent and formed by closing the mold, the tubular material is subjected to internal pressure. Since it is hot-formed without increasing, the increase of the cross-sectional circumference of the tubular material can be suppressed as much as possible, the reduction of the plate thickness can be prevented, and the bending of the tube can be performed. Since it is possible to recover the deformed portion such as buckling, it is possible to easily and easily form a tubular member with a deformed cross-section that has a bent portion with high accuracy. Compared with molding, various effects such as speeding up of molding, lowering of molding pressure, downsizing of molding apparatus, and simplification of its structure can be achieved.
【００４５】また、本請求項２記載に発明によれば、管
状部材の熱間成形方法において、管状素材を金型の型閉
めにより、拡管成形（バルジ成形）後の管状素材を曲げ
成形するにあたり、該管状素材は内圧を加えることな
く、熱間成形されるので、管状素材の断面周長の増加を
極力抑え、その板厚の減少を防止して、拡管成形（バル
ジ成形）後の該管の曲げ成形を行うことが可能であり、
しかもその後の矯正成形により座屈部位の回復が可能で
あることから、曲げ部位を有する、異形断面の拡管（バ
ルジ）管状部材を高精度をもって簡単容易に成形するこ
とができ、その上、熱間成形であることから冷間成形に
比べて、成形の迅速化、低成形圧化、成形装置の小型化
およびその構造の簡素化など諸効を奏することができ
る。According to the second aspect of the present invention, in the hot forming method for a tubular member, the tubular material is subjected to tube expansion (bulge forming) by bending the tubular material by closing the die. Since the tubular material is hot-formed without applying an internal pressure, the increase in the cross-sectional circumference of the tubular material is suppressed as much as possible, the decrease in the plate thickness is prevented, and the pipe after the expansion (bulge forming) is formed. It is possible to bend
Moreover, since the buckling area can be recovered by subsequent straightening, it is possible to easily and easily form an expanded (bulge) tubular member with a deformed cross-section that has a bent area. Since it is molding, various effects such as quicker molding, lower molding pressure, smaller molding apparatus and simplification of its structure can be achieved compared to cold molding.
【００４６】さらに、本請求項３記載の発明によれば、
前記請求項１または２記載の発明において、管状素材の
曲げ成形および矯正成形を同じ金型で行うことができる
ことから、前記請求項１または２記載の発明と同等の効
果を奏する上に、一層の成形の迅速化および成形装置の
小型化、構造の簡素化が可能になる。Further, according to the invention of claim 3,
In the invention according to claim 1 or 2, since bending molding and straightening molding of the tubular material can be performed by the same mold, the same effect as that of the invention according to claim 1 or 2 can be obtained, and further It is possible to speed up the molding, downsize the molding apparatus, and simplify the structure.
【図１】（ａ）および（ｂ）は、拡管（バルジ）成形後
の管状素材の斜視図および成形完了後の管状部材の斜視
図1A and 1B are a perspective view of a tubular material after tube expansion (bulge) molding and a perspective view of a tubular member after completion of molding.
【図２】管状部材の熱間成形方法の成形工程を示す概略
図FIG. 2 is a schematic view showing a forming step of a hot forming method for a tubular member.
【図３】拡管（バルジ）成形装置の要部縦断側面図FIG. 3 is a vertical sectional side view of a main part of a pipe expansion (bulge) forming device.
【図４】拡管（バルジ）成形装置の型閉め状態を示す拡
大部分断面図FIG. 4 is an enlarged partial cross-sectional view showing a mold closing state of a tube expansion (bulge) forming device.
【図５】拡管（バルジ）成形装置の型開き状態を示す拡
大部分断面図FIG. 5 is an enlarged partial cross-sectional view showing a mold opening state of a tube expansion (bulge) forming device.
【図６】図４および図２の６−６線に沿う拡管成形金型
の断面図FIG. 6 is a cross-sectional view of the tube expansion molding die taken along line 6-6 in FIGS. 4 and 2.
【図７】曲げ成形装置の要部縦断側面図FIG. 7 is a vertical sectional side view of a main part of the bending apparatus.
【図８】曲げ成形装置の型閉め状態を示す拡大部分断面
図FIG. 8 is an enlarged partial cross-sectional view showing a closed state of the bending apparatus.
【図９】図８および図２の９−９線に沿う曲げ成形金型
の断面図9 is a cross-sectional view of the bending mold along line 9-9 in FIGS. 8 and 2.
【図１０】矯正成形装置の要部縦断側面図FIG. 10 is a vertical sectional side view of a main portion of the straightening molding apparatus.
【図１１】図１０および図２の１１−１１線に沿う矯正
成形金型の断面図FIG. 11 is a cross-sectional view of the orthodontic molding die taken along the line 11-11 in FIGS. 10 and 2.
【図１２】図２の１２−１２線に沿う断面成形装置の断
面図12 is a cross-sectional view of the cross-section forming apparatus taken along line 12-12 of FIG.
Ｍ１・・・・・・・・・・拡管金型（第１の金型） Ｍ２・・・・・・・・・・曲げ金型（第２の金型） Ｍ３・・・・・・・・・・断面成形金型（第３の金型） ２０２ｍ・・・・・・・・曲げ金型の成形面 ２０３ｍ・・・・・・・・曲げ金型の成形面 M1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tube expansion mold (first mold) M2: Bending die (second die) M3: Cross-section molding die (third die) 202m ・ ・ ・ ・ ・ ・ Bending die molding surface 203m ・ ・ ・ ・ ・ ・ Bending die molding surface
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２１Ｄ 53/88 Ｂ２１Ｄ 53/88 Ｚ (72)発明者 金井 裕司 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (72)発明者 宮永 健二 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (72)発明者 水谷 孝樹 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 Ｆターム(参考） 4E063 AA04 BA01 JA02 JA04 JA07 KA02 MA18 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) B21D 53/88 B21D 53/88 Z (72) Inventor Yuji Kanai 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Kenji Miyanaga 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co. (72) Inventor Takaki Mizutani 1-10-1 Shin-Sayama City, Sayama City, Saitama Prefecture Engineering Co., Ltd. F-term (reference) 4E063 AA04 BA01 JA02 JA04 JA07 KA02 MA18
Claims (3)
って、 加熱された管状素材内に、内圧をかけることなく、加熱
された曲げ金型（Ｍ２）の型閉めによる曲げ成形を行う
曲げ成形工程と、 曲げ成形された管状素材内に気圧による内圧を付与し
て、該管状素材を曲げ金型（Ｍ２）の成形面（２０２
ｍ，２０３ｍ）になじむように矯正成形する矯正成形工
程と、 矯正成形された管状素材に気圧による内圧を付与した状
態で、この管状素材を断面成形金型（Ｍ３）の型閉めに
より、その管状素材をその長手方向と直交する方向から
加重を加え、所期の断面形状に成形する、断面成形工程
と、を含むことを特徴とする、管状部材の熱間成形方
法。1. A hot forming method for a tubular member using a die, wherein bending is performed by closing a heated bending die (M2) without applying internal pressure in a heated tubular material. Bending forming step, and applying internal pressure by atmospheric pressure to the bending formed tubular material to form the tubular material into the forming surface (202) of the bending die (M2).
(m, 203 m) and a straightening molding step of straightening and shaping the tubular material by applying a pressure to the straightened tubular material by closing the cross-section molding die (M3). A cross-section forming step of forming a desired cross-sectional shape by applying a load from a direction orthogonal to the longitudinal direction of the material, and a hot forming method for a tubular member.
って、 加熱された管状素材を、その開口両端部をシールしてそ
の軸方向に圧縮力を加えつつ、その内部に気圧による内
圧を付与し、加熱された拡管金型（Ｍ１）の型閉めによ
り所定部位を拡管成形する拡管成形工程と、 前記拡管成形工程において管状素材内に付与した内圧を
除去した後、加熱された曲げ金型（Ｍ２）の型閉めによ
る曲げ成形を行う曲げ成形工程と、 曲げ成形された管状素材内に気圧による内圧を付与し
て、該管状素材の座屈部分を前記曲げ金型（Ｍ２）の成
形面（２０２ｍ，２０３ｍ）になじむように矯正成形す
る矯正成形工程と、 矯正成形された管状素材に気圧による内圧を付与した状
態で、この管状素材を断面成形金型（Ｍ３）の型閉めに
より、その管状素材をその長手方向と直交する方法から
加重を加え、所期の断面形状に成形する、断面成形工程
と、を含むことを特徴とする、管状部材の熱間成形方
法。2. A hot forming method for a tubular member using a die, wherein a heated tubular material is sealed at both ends of an opening thereof and a compressive force is applied in an axial direction thereof while an internal pressure by an atmospheric pressure is applied to the inside thereof. And a tube-expanding step of expanding and molding a predetermined portion by closing the heated tube-expansion mold (M1), and after removing the internal pressure applied to the tubular material in the tube-expansion step, a heated bending die Bending forming step of performing bending forming by closing the die (M2), and applying internal pressure due to atmospheric pressure to the formed tubular material to form a buckling portion of the tubular material of the bending die (M2). The straightening step of straightening to fit the surface (202m, 203m), and the inner pressure of the straightened tubular material being applied with atmospheric pressure, the tubular material is closed by the cross-section molding die (M3). The tubular material Longitudinal and weights from how orthogonal addition, molded into desired cross-sectional shape, characterized in that it comprises a cross-section forming step, a hot forming method of the tubular member.
一の金型（Ｍ２）で行うことを特徴とする、前記請求項
１、または２記載の管状部材の熱間成形方法。3. The hot forming method for a tubular member according to claim 1, wherein the bending forming and the straightening forming are performed in the same mold (M2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001279115A JP2003088927A (en) | 2001-09-14 | 2001-09-14 | Hot forming method of tubular member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001279115A JP2003088927A (en) | 2001-09-14 | 2001-09-14 | Hot forming method of tubular member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003088927A true JP2003088927A (en) | 2003-03-25 |
Family
ID=19103367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001279115A Pending JP2003088927A (en) | 2001-09-14 | 2001-09-14 | Hot forming method of tubular member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003088927A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006026654A (en) * | 2004-07-13 | 2006-02-02 | Suzuki Motor Corp | Hydroforming method and hydroforming apparatus |
| JP2007210027A (en) * | 2006-02-13 | 2007-08-23 | Honda Motor Co Ltd | Bulging method and hollow formed body |
| WO2008130055A1 (en) * | 2007-04-18 | 2008-10-30 | Nippon Steel Corporation | Method of hydroforming work |
| JP2011020170A (en) * | 2009-07-21 | 2011-02-03 | Honda Motor Co Ltd | Hot bulge forming apparatus |
| JP2011031265A (en) * | 2009-07-31 | 2011-02-17 | Honda Motor Co Ltd | Apparatus and method of hot bulge forming, and product formed by hot bulge forming |
| JP2015208773A (en) * | 2014-04-30 | 2015-11-24 | 新日鐵住金株式会社 | Pipe member concurrently subjected to different kinds of processing |
| JP2017512139A (en) * | 2014-03-06 | 2017-05-18 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | How to adapt part shapes individually |
| CN109304388A (en) * | 2017-07-28 | 2019-02-05 | 上海宝钢高新技术零部件有限公司 | Bending press and method in a kind of curved part mould of hydroforming four |
| CN112024692A (en) * | 2020-08-19 | 2020-12-04 | 哈尔滨工业大学 | Ultra-low pressure liquid-filling forming system and method for special-shaped component |
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| JPH11179441A (en) * | 1997-12-17 | 1999-07-06 | Nissan Motor Co Ltd | Bulging device |
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| JPH10249444A (en) * | 1997-03-06 | 1998-09-22 | Hitachi Ltd | Method for forming different cross section bending tube |
| JPH11179441A (en) * | 1997-12-17 | 1999-07-06 | Nissan Motor Co Ltd | Bulging device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006026654A (en) * | 2004-07-13 | 2006-02-02 | Suzuki Motor Corp | Hydroforming method and hydroforming apparatus |
| JP2007210027A (en) * | 2006-02-13 | 2007-08-23 | Honda Motor Co Ltd | Bulging method and hollow formed body |
| JP5009363B2 (en) * | 2007-04-18 | 2012-08-22 | 新日本製鐵株式会社 | Hydroform processing method |
| JPWO2008130055A1 (en) * | 2007-04-18 | 2010-07-22 | 新日本製鐵株式会社 | Hydroform processing method |
| WO2008130055A1 (en) * | 2007-04-18 | 2008-10-30 | Nippon Steel Corporation | Method of hydroforming work |
| KR101216844B1 (en) * | 2007-04-18 | 2012-12-28 | 신닛테츠스미킨 카부시키카이샤 | Method of hydroforming work |
| US8381560B2 (en) | 2007-04-18 | 2013-02-26 | Nippon Steel Corporation | Hydroforming method |
| JP2011020170A (en) * | 2009-07-21 | 2011-02-03 | Honda Motor Co Ltd | Hot bulge forming apparatus |
| US8408034B2 (en) | 2009-07-21 | 2013-04-02 | Honda Motor Co., Ltd. | Hot bulge forming die apparatus |
| JP2011031265A (en) * | 2009-07-31 | 2011-02-17 | Honda Motor Co Ltd | Apparatus and method of hot bulge forming, and product formed by hot bulge forming |
| JP2017512139A (en) * | 2014-03-06 | 2017-05-18 | ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトＴｈｙｓｓｅｎＫｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ ＡＧ | How to adapt part shapes individually |
| JP2015208773A (en) * | 2014-04-30 | 2015-11-24 | 新日鐵住金株式会社 | Pipe member concurrently subjected to different kinds of processing |
| CN109304388A (en) * | 2017-07-28 | 2019-02-05 | 上海宝钢高新技术零部件有限公司 | Bending press and method in a kind of curved part mould of hydroforming four |
| CN112024692A (en) * | 2020-08-19 | 2020-12-04 | 哈尔滨工业大学 | Ultra-low pressure liquid-filling forming system and method for special-shaped component |
| CN112024692B (en) * | 2020-08-19 | 2021-04-09 | 哈尔滨工业大学 | Ultra-low pressure liquid-filling forming system and method for special-shaped component |
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