JP2013158818A - Method of manufacturing hollow member for welding by hydroforming - Google Patents

Method of manufacturing hollow member for welding by hydroforming Download PDF

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JP2013158818A
JP2013158818A JP2012024173A JP2012024173A JP2013158818A JP 2013158818 A JP2013158818 A JP 2013158818A JP 2012024173 A JP2012024173 A JP 2012024173A JP 2012024173 A JP2012024173 A JP 2012024173A JP 2013158818 A JP2013158818 A JP 2013158818A
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tube
pipe
tube end
sealing member
mold
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JP5853745B2 (en
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Manabu Wada
学 和田
Masaaki Mizumura
正昭 水村
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method by which, when an end part of a material pipe is sealed upon manufacturing a hollow member for welding by applying hydroforming, the end part can be surely sealed so as not to cause leakage of a liquid for pressurization, and at the same time, an inclined groove face for welding is formed.SOLUTION: When sealing both ends of a material pipe by a pipe end sealing member serving also as a shaft pressing member, a sealing member having an insertion part having an outer diameter smaller than the pipe end inner diameter of the material pipe and having an inclined surface formed at a part to be abutted on an end face of the material pipe end is used as the pipe end sealing member. The insertion part of the pipe end sealing member is inserted into the pipe end of the material pipe, and pressurizing force in an axial direction is given to the pipe end sealing member. Thus, the pipe end of the material pipe is plastically deformed in a direction of filling a clearance between the outer peripheral surface of the pipe end and the projection part outer peripheral surface of the pipe end sealing member, the pipe end is sealed, and at the same time, an inclined groove face is formed on the end face of the pipe end.

Description

本発明は、自動車部品などに使用される中空部材、特に溶接のための開先面を形成した中空部材を、ハイドロフォーム加工によって製造するための方法に関するものである。   The present invention relates to a method for producing a hollow member used for automobile parts and the like, in particular, a hollow member formed with a groove surface for welding by hydroforming.

ハイドロフォーム加工は、成形用素材として、鋼管やステンレス鋼管、あるいはアルミ管などの中空管状の素材（素材管）を用い、その素材管を金型のキャビティ内にセットして、素材管内に水などの加圧用液体を充填し、素材管内に高圧の液圧を加えると同時に、素材管の両端部からその軸線方向に沿って圧縮（軸押し）して、金型の内面形状に沿った形状に成形する加工法であり、複雑な形状の中空部材を一体に形成することができるため、近年、自動車などの各種部品の製造に適用されるようになっている。   In the hydroforming process, a hollow tubular material (material tube) such as a steel tube, stainless steel tube, or aluminum tube is used as a forming material. The material tube is set in the cavity of the mold, and water is contained in the material tube. Fill the material tube with high pressure, and simultaneously compress (axially push) the material tube along the axial direction from both ends of the material tube to form the shape of the inner surface of the mold. This is a processing method for molding, and since a hollow member having a complicated shape can be integrally formed, it has recently been applied to the manufacture of various parts such as automobiles.

素材管に対してハイドロフォーム加工を行う場合の一般的な状況について、図６を参照して説明する。   A general situation when hydroforming is performed on a material pipe will be described with reference to FIG.

図６において、金型１は、上下に分離可能な上型３と下型５によって構成されており、その上型３と下型５との間に成形用空間（キャビティ）７が形成されている。
素材管１１は、その長さ方向の中央部分がキャビティ７内に位置するように金型１内に配置され、その素材管１１の両端（管端部１３Ａ、１３Ｂ）が金型１の素材管端部支持部位１Ａ、１Ｂに支持されている。またその素材管１１の管端部１３Ａ、１３Ｂは、管内の空間を密閉するための管端封止部材１５Ａ、１５Ｂによってシールされている。これらの管端封止部材１５Ａ、１５Ｂは、単に素材管１１を密閉するばかりでなく、素材管１１をその軸線方向に沿って圧縮する（軸押しする）ための軸押し部材を兼ねており、その少なくとも一方は、図示しない油圧シリンダなどの軸押し駆動装置に連結されている。またこれらの管端封止部材１５Ａ、１５Ｂのうち、一方の管端封止部材１５Ａには、素材管１１内に加圧用液体、例えば水を導入して加圧するための導入路１７が形成されており、他方の管端封止部材１５Ｂには、素材管１１内の空気を排除するための排出路１９が、必要に応じて形成されている。 In FIG. 6, the mold 1 is composed of an upper mold 3 and a lower mold 5 that are separable up and down, and a molding space (cavity) 7 is formed between the upper mold 3 and the lower mold 5. Yes.
The material tube 11 is arranged in the mold 1 so that the central portion in the length direction is located in the cavity 7, and both ends (tube end portions 13 </ b> A and 13 </ b> B) of the material tube 11 are the material tubes of the mold 1. It is supported by the end support portions 1A and 1B. Further, the pipe end portions 13A and 13B of the material pipe 11 are sealed by pipe end sealing members 15A and 15B for sealing the space in the pipe. These tube end sealing members 15A and 15B not only simply seal the material tube 11, but also serve as a shaft pressing member for compressing the material tube 11 along its axial direction (axially pressing), At least one of them is connected to a shaft pushing drive device such as a hydraulic cylinder (not shown). Of these pipe end sealing members 15A and 15B, one pipe end sealing member 15A is formed with an introduction path 17 for introducing and pressurizing a pressurizing liquid, for example, water, into the material pipe 11. In the other pipe end sealing member 15B, a discharge path 19 for removing air in the material pipe 11 is formed as necessary.

ハイドロフォーム加工を行うにあたっては、上型３と下型５とを離隔させた状態（金型開放状態）で素材管１１を上型３と下型５との間に配置して、管端部１３Ａ、１３Ｂを素材管端部支持部位１Ａ、１Ｂに支持させ、上型３と下型５を閉じて型締めした後、シール部材１５Ａ、１５Ｂを素材管１１の管端部１３Ａ、１３Ｂへ駆動して、その管端部１３Ａ、１３Ｂをシールし、素材管１１の一端側の導入路１７から素材管１１内に加圧用液体を導入し（矢印Ａ）、その加圧用液体により素材管１１内の空気を排出路１９から追い出し（矢印Ｂ）ながら、素材管１１内を加圧用液体で満たし、引き続き排出路１９を閉じて、加圧用液体により素材管１１内を高圧に加圧し、同時に軸押し部材を兼ねた管端封止部材１５Ａ、１５Ｂによって、素材管１１にその軸線方向に沿った荷重（矢印Ｃ、Ｅ）を加えて圧縮する。これによって素材管１１が塑性変形して、キャビティ７の内面に沿った形状に成形される。
なお、排出路１９を設けない場合は、素材管１１とシール部材１５Ａ、１５Ｂに間隙を持たせた状態で加圧用液体を導入し、この間隙から空気を十分に追い出した後、シール部材１５Ａ、１５Ｂを管軸方向に移動して間隙を閉じる。 In performing hydroforming, the material pipe 11 is disposed between the upper mold 3 and the lower mold 5 in a state where the upper mold 3 and the lower mold 5 are separated from each other (die open state), and the pipe end portion 13A and 13B are supported by the material tube end support portions 1A and 1B, the upper die 3 and the lower die 5 are closed and clamped, and then the seal members 15A and 15B are driven to the tube ends 13A and 13B of the material tube 11 Then, the pipe end portions 13A and 13B are sealed, and the pressurizing liquid is introduced into the material pipe 11 from the introduction path 17 on one end side of the material pipe 11 (arrow A). The material pipe 11 is filled with the pressurizing liquid while the air is expelled from the discharge path 19 (arrow B), the discharge path 19 is subsequently closed, the inside of the material pipe 11 is pressurized to a high pressure with the pressurizing liquid, and the shaft is pushed at the same time. Tube end sealing members 15A and 15B that also serve as members, 11 to the load (arrow C, E) along its axial direction to compress added. As a result, the material tube 11 is plastically deformed and formed into a shape along the inner surface of the cavity 7.
In the case where the discharge path 19 is not provided, the pressurizing liquid is introduced with a gap between the material tube 11 and the seal members 15A and 15B, and after sufficiently expelling air from the gap, the seal members 15A and 15A 15B is moved in the tube axis direction to close the gap.

ここで、管端封止部材１５Ａ、１５Ｂは、液圧印加・軸押し時には、加圧用液体が漏洩しないように、確実に素材管１１の両端を密閉しておく必要がある。すなわち、管端封止部材１５Ａ、１５Ｂによるシールが不充分で、管端封止部材１５Ａ、１５Ｂの周囲と素材管１１の管端部１３Ａ、１３Ｂとの間から加圧用液体が漏洩した場合、素材管１１の内側に高圧の液圧が充分に作用せず、そのため素材が塑性変形に至らず、その結果、金型内面に沿った形状に成形できずに、成形不良が発生してしまう。   Here, the pipe end sealing members 15A and 15B need to securely seal both ends of the material pipe 11 so that the pressurizing liquid does not leak when the hydraulic pressure is applied and the shaft is pushed. That is, when the sealing by the tube end sealing members 15A and 15B is insufficient and the pressurizing liquid leaks from between the tube end sealing members 15A and 15B and the tube ends 13A and 13B of the material tube 11, A high hydraulic pressure does not sufficiently act on the inner side of the material tube 11, so that the material does not undergo plastic deformation, and as a result, it cannot be formed into a shape along the inner surface of the mold, resulting in a molding failure.

従来一般のハイドロフォーム加工における素材管両端のシール方法としては、いくつかの方法が採用されており、その代表的な三つの例を、素材管１１の一端側の管端部１３Ａ及びそれをシールするための一方の管端封止部材１５Ａについて、図７〜図９にそれぞれ示す。   Several methods have been adopted as sealing methods at both ends of the material pipe in the conventional general hydroforming process, and three typical examples thereof are the pipe end portion 13A on one end side of the material pipe 11 and sealing it. One tube end sealing member 15A for the purpose is shown in FIGS.

図７に示す例では、管端封止部材１５Ａは、大径の円柱状をなす基体部２０の軸方向の一端側の面から、同一軸線上において突出する小径の円柱状の挿入部２２を一体に形成した構成とされている。そして、挿入部２０Ｂの外周面と素材管１１の管端部１３Ａの内周面との間にゴムなどからなるＯリング２４を介在させた状態で、小径の挿入部２２を管端部１３Ａにその開口端側から挿入し、Ｏリング２４によって、突出部２２の外周面と管端部１３Ａの内周面との間をシールすることとしている（例えば特許文献１の第５図、特許文献２の図９、特許文献３の図１３（ｄ）など参照）。   In the example shown in FIG. 7, the tube end sealing member 15 </ b> A includes a small-diameter columnar insertion portion 22 that protrudes on the same axis line from a surface on one end side in the axial direction of the base portion 20 having a large-diameter columnar shape. The structure is formed integrally. Then, with the O-ring 24 made of rubber or the like interposed between the outer peripheral surface of the insertion portion 20B and the inner peripheral surface of the tube end portion 13A of the material tube 11, the small-diameter insertion portion 22 is inserted into the tube end portion 13A. It is inserted from the opening end side, and the O-ring 24 seals between the outer peripheral surface of the protruding portion 22 and the inner peripheral surface of the tube end portion 13A (for example, FIG. 5 of Patent Document 1 and Patent Document 2). 9 and FIG. 13D of Patent Document 3).

このようなＯリングによるシール方法は、簡単かつ安価ではあるが、シール効果が必ずしも充分ではなく、特に複雑な形状に成形するために高圧で加圧用液体を加圧する場合には、加圧用液体の漏洩が生じてしまうおそれがあった。また高圧で使用すれば、Ｏリング２４の耐久性に問題が生じ、頻繁にＯリングを交換しなければならなくなる、という問題もあった。   Such a sealing method using an O-ring is simple and inexpensive, but the sealing effect is not always sufficient. In particular, when pressurizing the pressurizing liquid at a high pressure to form a complicated shape, the pressurizing liquid There was a risk of leakage. Further, when used at a high pressure, there is a problem in durability of the O-ring 24, and the O-ring must be frequently replaced.

一方、図８に示す例においては、管端封止部材１５Ａは、前記と同様な大径の基体部２０と小径の挿入部２２との境界の段差部２６に、階段状をなす中間径の階段状突起部２８を形成した構成としている。そしてその管端封止部材１５Ａの挿入部２２を素材管１１の管端部１３Ａに挿入するに当たって、管端封止部材１５Ａを加圧して、階段状突起部２８を、管端部１３Ａの端面に押し当てて塑性変形させ、これにより階段状突起部２８を素材に密着させて、シールするものである（例えば特許文献２の図１０の（ｃ）、特許文献３の図１３（ｃ）参照）。   On the other hand, in the example shown in FIG. 8, the tube end sealing member 15 </ b> A has an intermediate diameter having a stepped shape at the stepped portion 26 at the boundary between the large-diameter base portion 20 and the small-diameter insertion portion 22. A stepped protrusion 28 is formed. And when inserting the insertion part 22 of the pipe end sealing member 15A into the pipe end part 13A of the material pipe 11, the pipe end sealing member 15A is pressurized, and the stepped protrusion 28 is made to be the end face of the pipe end part 13A. Are pressed and plastically deformed, whereby the stepped protrusion 28 is brought into close contact with the material and sealed (see, for example, FIG. 10 (c) of Patent Document 2 and FIG. 13 (c) of Patent Document 3). ).

また図９に示す例においては、管端封止部材１５Ａは、前記同様な大径の基体部２０と小径の挿入部２２との境界の段差面２６に、環状突起部３０を形成した構成としている。そして管端封止部材１５Ａの挿入部２２を素材管１１の管端部１３Ａに挿入するに当たって、環状突起部３０を、管端封止部材１５Ａに与える加圧力によって素材管１１の端面に押し当てて食い込ませ、シールするものである（例えば特許文献１の第１図もしくは第４図、特許文献３の図１３（ｂ）など）。   In the example shown in FIG. 9, the tube end sealing member 15 </ b> A has a structure in which an annular protrusion 30 is formed on the step surface 26 at the boundary between the large-diameter base portion 20 and the small-diameter insertion portion 22. Yes. When inserting the insertion portion 22 of the tube end sealing member 15A into the tube end portion 13A of the material tube 11, the annular protrusion 30 is pressed against the end surface of the material tube 11 by the pressure applied to the tube end sealing member 15A. It is used for encroaching and sealing (for example, FIG. 1 or FIG. 4 of Patent Document 1 and FIG. 13B of Patent Document 3).

これらの図８に示す方法や、図９に示す方法では、図７に示すようなＯリング２４を使用する場合と比較すれば、より確実に管端部をシールすることができ、またＯリング交換の手間も不要となる。しかしながら、図８に示す例の場合、シール時に階段状突起部２８によって素材管１１の端面を塑性変形させるところから、成形後の製品（成形品）の端面に変形部分がそのまま残り、外観品質に劣ってしまう問題がある。そのため通常は、変形した端面付近の部分を切断除去せざるを得ず、その場合には材料歩留まりが低くなってしまう問題が生じる。また図９に示した例の場合も、成形品の端面に、環状突起部３０が食い込んだ凹部が残り、この場合も、外観の点から、成形後に成形品の端面付近を切断、除去せざるを得ないことが多く、やはり材料歩留まりの点で問題があった。   In the method shown in FIG. 8 and the method shown in FIG. 9, the pipe end can be more reliably sealed as compared with the case where the O-ring 24 as shown in FIG. 7 is used. No need for replacement. However, in the case of the example shown in FIG. 8, since the end face of the material tube 11 is plastically deformed by the stepped protrusion 28 at the time of sealing, the deformed portion remains as it is on the end face of the molded product (molded product). There is an inferior problem. For this reason, usually, a portion near the deformed end face has to be cut and removed, and in this case, there arises a problem that the material yield is lowered. In the case of the example shown in FIG. 9 as well, a concave portion in which the annular protrusion 30 has bite remains on the end surface of the molded product, and in this case as well, the vicinity of the end surface of the molded product must be cut and removed after molding from the viewpoint of appearance. In many cases, there was a problem in terms of material yield.

なお、図８に示す方法では、管端封止部材１５Ａの挿入部２２と金型１の内面との間に挟まれた素材管端部１３Ａの端面を確実に変形させて、確実にシールするためには、管端部１３Ａの外周面が金型１の内面に密着すると同時に、管端部１３Ａの内周面が管端封止部材１５Ａの挿入部２２の外周面に密着していることが必要とされる。また図９の例の場合も、管端部１３Ａの端面に環状突起部３０を確実に食い込ませるためには、管端部１３Ａの外周面が金型１の内面に密着すると同時に、管端部１３Ａの内周面が管端封止部材１５Ａの挿入部２２の外周面に密着していることが必要とされる。   In the method shown in FIG. 8, the end surface of the material tube end portion 13A sandwiched between the insertion portion 22 of the tube end sealing member 15A and the inner surface of the mold 1 is reliably deformed and reliably sealed. For this purpose, the outer peripheral surface of the tube end portion 13A is in close contact with the inner surface of the mold 1, and the inner peripheral surface of the tube end portion 13A is in close contact with the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15A. Is needed. In the case of the example of FIG. 9 also, in order to ensure that the annular projection 30 bites into the end surface of the tube end portion 13A, the outer peripheral surface of the tube end portion 13A is in close contact with the inner surface of the mold 1 and at the same time The inner peripheral surface of 13A is required to be in close contact with the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15A.

ところで、自動車部品などに使用される中空部材は、その管端部を他の部材にアーク溶接などにより溶接して使用することが多い。その場合、溶接継ぎ手となる管端部の端面に、傾斜面（傾斜状開先面）を形成し、溶接時において、相手材との間でＶ形開先あるいはレ形開先などの開先が形成されるように構成することが多い。
そして前述のようにハイドロフォーム加工によって所定の形状に成形された中空部材の場合、ハイドロフォーム加工により成形した後、改めて管端部に切削加工などの機械加工を施して、傾斜状開先面を形成するのが一般的である。しかしながらこのような方法では、ハイドロフォーム加工による成形と、傾斜状開先面の形成とを別工程で行なうため、工程数が多くならざるを得ず、高コストを要するとともに、生産性も低くなるという問題がある。 By the way, a hollow member used for automobile parts or the like is often used by welding its pipe end to another member by arc welding or the like. In that case, an inclined surface (inclined groove surface) is formed on the end surface of the pipe end portion serving as a weld joint, and a groove such as a V-shaped groove or a ledge-shaped groove is formed with the mating member during welding. Are often formed.
In the case of a hollow member formed into a predetermined shape by hydroforming as described above, after forming by hydroforming, the pipe end is subjected to machining such as cutting to form an inclined groove surface. It is common to form. However, in such a method, since the forming by hydroforming and the formation of the inclined groove surface are performed in separate steps, the number of steps must be increased, and the cost is high and the productivity is also low. There is a problem.

特開平２−２２９６２６号公報JP-A-2-229626 特開２００６−２５５７２６号公報JP 2006-255726 A 特開２００４−２０２５７１号公報JP 2004-202571 A

本発明は、前記事情を背景としてなされたもので、ハイドロフォーム加工を適用して溶接用中空部材を製造するに当たり、素材管の端部をシールするに際し、高圧を加えて複雑な形状に加工する場合などにおいても、加圧用液体の漏洩が生じないように確実にシールすることができ、しかも成形品の外観不良を招くおそれが少ないばかりでなく、素材管端部のシールと同時に溶接用の傾斜状開先面を形成するようにして、ハイドロフォーム加工による成形後に、改めて開先部形成のための加工（開先加工）を行なうことを不要とし、これにより溶接用中空部材の製造コストの低減および生産性の向上を図り得るようにした、ハイドロフォーム加工による溶接用中空部材の製造方法を提供することを課題としている。   The present invention has been made against the background described above, and in manufacturing a hollow member for welding by applying hydroforming, when sealing the end of the material pipe, it is processed into a complicated shape by applying high pressure. In some cases, it is possible to securely seal so as not to cause leakage of the pressurizing liquid, and there is little risk of inferior appearance of the molded product. By forming a groove-like groove surface, it is not necessary to perform a new groove forming process (groove processing) after forming by hydroforming, thereby reducing the manufacturing cost of the welding hollow member. It is another object of the present invention to provide a method for producing a hollow member for welding by hydroforming, which can improve productivity.

本発明者は、上述の課題を解決するため、種々実験・検討を重ねた結果、管端封止部材における挿入部（素材管の管端部に挿入される部分）の外周面と素材管の管端部内周面との間に、積極的にクリアランスを持たせておくと同時に、管端封止部材における素材管端部の端面に当接する個所に傾斜面を形成しておけば、管端封止部材の挿入部を素材管の管端部に挿入して軸線方向に加圧することによって、管端部をその内面側（クリアランスの側）に塑性変形させて、管端封止部材の突出部の外周面に密着させ、確実にシールすることが可能となるばかりでなく、素材管の管端部端面に傾斜状開先面を形成し得ることを見い出して、本発明をなすに至った。   In order to solve the above-mentioned problems, the present inventor has conducted various experiments and examinations, and as a result, the outer peripheral surface of the insertion portion (the portion inserted into the tube end portion of the material tube) in the tube end sealing member and the material tube By providing a positive clearance between the inner peripheral surface of the tube end portion and at the same time forming an inclined surface at the portion that contacts the end surface of the tube end portion of the tube end sealing member, By inserting the insertion part of the sealing member into the pipe end of the material pipe and pressurizing it in the axial direction, the pipe end is plastically deformed to the inner surface side (clearance side), and the tube end sealing member protrudes. It has been found that an inclined groove surface can be formed on the end face of the tube end of the material pipe, in addition to being able to seal tightly to the outer peripheral surface of the part and surely seal it, and has made the present invention. .

したがって本発明の要旨とするところは、下記の通りである。
すなわち、本発明は、
中空管状をなす素材管の両端部を、軸押し部材を兼ねる管端封止部材によりシールし、その素材管を金型内に配置して、素材管の内側空間に液圧を加えるとともに、素材管の両端部からその軸線に沿った方向に加圧して、素材管を金型のキャビティ内面に沿った形状に成形するハイドロフォーム加工を適用して、中空部材を製造する方法において、
前記管端封止部材として、外径が素材管の外径に等しい基体部と、その基体部から突出しかつ外径が素材管の管端部の内径より小さい挿入部と、前記基体部の外周面と挿入部の外周面との間の段差部分から軸線方向に沿って突出する突出部とを有し、かつその突出部の内周側に、所定角度で傾斜する傾斜面が形成された封止部材を用い、
素材管内に成形のための液圧を加える以前の段階で、前記管端封止部材の挿入部を素材管の管端部内に挿入するとともに、素材管を、その管端部の外周面が金型の素材管端部支持部位の内面に接するように金型内に配置した状態で、管端封止部材に軸線方向に沿う加圧力を加えて、管端封止部材の傾斜面を含む段差部分により素材管の管端部の端面を加圧し、
これにより素材管の管端部に前記傾斜面に沿う溶接用の傾斜状開先部を形成すると同時に、管端部の内周面の少なくとも一部が内側に***するように塑性変形させて、その***部分を前記挿入部の外周面に密着させることによって管端部を封止し、
その後、素材管内に成形のための液圧を加えるとともに、素材管に軸線方向に沿った成形用加圧力を加えることを特徴とする、ハイドロフォーム加工による溶接用中空部材の製造方法、
にある。 Therefore, the gist of the present invention is as follows.
That is, the present invention
Both ends of the material tube forming a hollow tube are sealed by a tube end sealing member that also serves as a shaft pushing member, the material tube is placed in a mold, and hydraulic pressure is applied to the inner space of the material tube. In a method of manufacturing a hollow member by applying a hydroforming process in which a material pipe is molded into a shape along the cavity inner surface of a mold by pressing in a direction along the axis from both ends of the pipe,
As the tube end sealing member, a base portion having an outer diameter equal to the outer diameter of the material tube, an insertion portion protruding from the base portion and having an outer diameter smaller than the inner diameter of the tube end portion of the material tube, and an outer periphery of the base portion A projecting portion projecting along the axial direction from a step portion between the surface and the outer peripheral surface of the insertion portion, and an inclined surface inclined at a predetermined angle is formed on the inner peripheral side of the projecting portion. Using a stop member,
Before the hydraulic pressure for molding is applied to the raw material pipe, the insertion portion of the pipe end sealing member is inserted into the pipe end portion of the raw material pipe, and the outer peripheral surface of the pipe end portion is made of gold. A step including an inclined surface of the tube end sealing member by applying a pressing force along the axial direction to the tube end sealing member in a state of being arranged in the mold so as to be in contact with the inner surface of the material tube end supporting portion of the mold Press the end face of the tube end of the material pipe with the part,
Thereby, at the same time as forming the inclined groove portion for welding along the inclined surface in the tube end portion of the material tube, plastic deformation so that at least a part of the inner peripheral surface of the tube end portion protrudes inward, Sealing the tube end by bringing the raised portion into close contact with the outer peripheral surface of the insertion portion,
Then, a method for producing a hollow member for welding by hydroforming, characterized by applying a hydraulic pressure for molding in the material pipe and applying a pressing force along the axial direction to the material pipe,
It is in.

本発明によれば、管端封止部材における挿入部（素材管の管端部に挿入される部分）の外径を素材管の管端部の内径より小さく設定しておくことによって、ハイドロフォーム加工のための管端シール時においては、管端部の外周面と素材管の管端部内周面との間に、積極的にクリアランスを与えることができる。またこのようなクリアランスを与えると同時に、管端封止部材における素材管端部の端面に当接する個所に傾斜面を形成しておくことによって、管端封止部材の挿入部を素材管の管端部に挿入して管端封止部材を軸線方向に加圧した際に、素材管の管端部の少なくとも一部を、その内面側が***するように塑性変形させることができ、さらにその***部分を、管端封止部材の突出部の外周面に密着させることによって、管端部を確実にシールすることが可能となった。また同時に、管端部材の前記家斜面によって、素材管の管端部の端面に、溶接時の開先となる傾斜状開先面を形成することが可能となった。さらにその場合、管端部は主として内面側のみに変形することから、管端部の外観不良の発生を回避して、材料歩留まりの向上を図ることが可能となり、しかもハイドロフォーム加工後に、改めて傾斜状開先面の形成のための加工を行わなくて済むため、溶接用中空部材の製造コストおよび生産性を向上させることができる。
したがって本発明によれば、自動車・建設機械など、複雑な形状を有しかつ傾斜状開先面を有する溶接用中空部材が要求される分野でその工業的意義は大きい。 According to the present invention, by setting the outer diameter of the insertion portion (portion inserted into the tube end portion of the material tube) in the tube end sealing member to be smaller than the inner diameter of the tube end portion of the material tube, At the time of pipe end sealing for processing, a clearance can be positively provided between the outer peripheral surface of the pipe end and the inner peripheral surface of the pipe end of the material pipe. Further, at the same time as providing such a clearance, an inclined surface is formed at a location where the tube end sealing member abuts on the end surface of the material tube end, so that the insertion portion of the tube end sealing member can be connected to the tube of the material tube. When inserted into the end and pressurizing the tube end sealing member in the axial direction, at least a part of the tube end of the material tube can be plastically deformed so that its inner surface is raised, and further By bringing the portion into close contact with the outer peripheral surface of the protruding portion of the tube end sealing member, the tube end portion can be reliably sealed. At the same time, it has become possible to form an inclined groove surface that becomes a groove at the time of welding on the end surface of the pipe end portion of the material pipe by the house slope of the pipe end member. Furthermore, in that case, the pipe end part is deformed mainly only on the inner surface side, so that it is possible to avoid the appearance defect of the pipe end part and to improve the material yield. Since it is not necessary to perform processing for forming the grooved surface, the manufacturing cost and productivity of the welding hollow member can be improved.
Therefore, according to the present invention, the industrial significance is great in fields where a hollow member for welding having a complicated shape and an inclined groove surface is required, such as automobiles and construction machines.

本発明のハイドロフォーム加工による溶接用中空部材の製造方法の一実施形態について、素材管の管端部と管端封止部材との関係を示す図で、その（Ａ）は、管端封止部材の挿入部を素材管の管端部に挿入した段階（管端封止部材加圧前）の状態を示す模式的な断面図、（Ｂ）は、管端封止部材に加圧力を加えて素材管の管端部を変形させたシール段階を示す模式的な断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the relationship between the pipe end part of a raw material pipe | tube, and a pipe end sealing member about one Embodiment of the manufacturing method of the hollow member for welding by the hydroforming process of this invention, The (A) is pipe end sealing. Schematic cross-sectional view showing the state (before pressurizing the tube end sealing member) of inserting the member insertion portion into the tube end of the material tube, (B) is applying pressure to the tube end sealing member It is typical sectional drawing which shows the seal | sticker stage which deform | transformed the pipe end part of the raw material pipe | tube. 図１に示される実施形態によって得られた中空部材の管端部を示す模式的な断面図である。It is typical sectional drawing which shows the pipe end part of the hollow member obtained by embodiment shown by FIG. 図２に示す中空部材を溶接する際の状況を示す正面図である。It is a front view which shows the condition at the time of welding the hollow member shown in FIG. 本発明のハイドロフォーム加工による溶接用中空部材の製造方法の別の実施形態について、素材管の管端部と管端封止部材との関係を示す図で、その（Ａ）は、管端封止部材の挿入部を素材管の管端部に挿入した段階（管端封止部材加圧前）の状態を示す模式的な断面図、（Ｂ）は、管端封止部材に加圧力を加えて素材管の管端部を変形させたシール段階を示す模式的な断面図である。It is a figure which shows the relationship between the pipe end part of a raw material pipe | tube, and a pipe end sealing member about another embodiment of the manufacturing method of the hollow member for welding by the hydroforming process of this invention, The (A) is pipe end sealing. Schematic sectional view showing the state of the stage where the insertion part of the stop member is inserted into the pipe end part of the material pipe (before pressurizing the pipe end sealing member), (B) shows the pressure applied to the pipe end sealing member In addition, it is a schematic cross-sectional view showing a sealing stage in which the pipe end of the material pipe is deformed. 本発明のハイドロフォーム加工による溶接用中空部材の製造方法において、素材管の片端側には傾斜状開先面を形成しない場合の、その片端側における素材管の管端部と管端封止部材との関係を示す図で、その（Ａ）は、管端封止部材の挿入部を素材管の管端部に挿入した段階（管端封止部材加圧前）の状態を示す模式的な断面図、（Ｂ）は、管端封止部材に加圧力を加えて素材管の管端部を変形させたシール段階を示す模式的な断面図である。In the method for manufacturing a hollow member for welding by hydroforming according to the present invention, when a sloped groove surface is not formed on one end side of the material tube, the tube end portion and the tube end sealing member of the material tube on the one end side (A) is a schematic diagram showing a state at the stage of inserting the insertion portion of the tube end sealing member into the tube end portion of the material tube (before pressurization of the tube end sealing member). Sectional drawing (B) is a schematic sectional view showing a sealing stage in which the tube end portion of the material tube is deformed by applying pressure to the tube end sealing member. 一般的なハイドロフォーム加工方法を実施している状況の一例を示す模式的な断面図である。It is typical sectional drawing which shows an example of the condition which is implementing the general hydroform processing method. 従来のハイドロフォーム加工方法における管端シール手段の第１の例を示す模式的な断面図である。It is typical sectional drawing which shows the 1st example of the pipe end sealing means in the conventional hydroforming processing method. 従来のハイドロフォーム加工方法における管端シール手段の第２の例を示す模式的な断面図である。It is typical sectional drawing which shows the 2nd example of the pipe end sealing means in the conventional hydroforming processing method. 従来のハイドロフォーム加工方法における管端シール手段の第３の例を示す模式的な断面図である。It is typical sectional drawing which shows the 3rd example of the pipe end sealing means in the conventional hydroforming processing method.

次に本発明について詳細に説明する。   Next, the present invention will be described in detail.

図１の（Ａ）、（Ｂ）には、本発明の一実施形態として、ハイドロフォーム加工における管端シールおよび開先部形成の状況を示す。なおハイドロフォーム加工における全体的な構成は、既に説明した図６に示したものと同様であり、図１の（Ａ）、（Ｂ）において、図６に示した要素と同一の要素については図６と同じ符号を付し、その詳細な説明は省略する。   FIGS. 1A and 1B show a state of forming a pipe end seal and a groove in hydroforming as one embodiment of the present invention. The overall structure in the hydroforming process is the same as that shown in FIG. 6 described above. In FIGS. 1A and 1B, the same elements as those shown in FIG. The same reference numerals as in FIG.

素材管１１にハイドロフォーム加工を実施するにあたっては、図６に示したように、素材管１１の両端（管端部１３Ａ、１３Ｂ）に、予め、軸押し部材を兼ねた管端封止部材１５Ａ、１５Ｂを取り付けておく。管端封止部材１５Ａ、１５Ｂのうち、一方の管端封止部材１５Ａには、液圧付与のための液体を導入する導入路１７が形成されており、他方の管端封止部材１５Ｂには、排出路１９が形成されている。これらの管端封止部材１５Ａ、１５Ｂのうち、一方の管端封止部材１５Ａと、それに対応する素材管１１の管端部１３Ａの部分の状況を、図１の（Ａ）、（Ｂ）に拡大して示しており、これについて、次に詳細に説明する。   In carrying out the hydroforming process on the material pipe 11, as shown in FIG. 6, the pipe end sealing member 15A that also serves as a shaft pushing member at both ends (tube end portions 13A and 13B) of the material pipe 11 in advance. , 15B is attached. Of the tube end sealing members 15A and 15B, one of the tube end sealing members 15A is formed with an introduction path 17 for introducing a liquid for applying a hydraulic pressure, and the other tube end sealing member 15B has The discharge path 19 is formed. Of these pipe end sealing members 15A and 15B, the situation of one pipe end sealing member 15A and the corresponding pipe end portion 13A of the material pipe 11 is shown in FIGS. This will be described in detail below.

管端封止部材１５Ａは、図１の（Ａ）、（Ｂ）に示すように、外径Ｄ１の大径の円柱状をなす基体部２０と、相対的に小径の外径Ｄ２の円柱状をなす挿入部２２とを、炭素鋼やダイス鋼などの硬質金属によって一体に形成したものである。ここで、挿入部２２は、基体部２０の軸線Ｏと同一軸線上において、基体部２０の端面（段差面２６）から突出するように形成されている。そして段差面２６には、軸線方向に沿って突出する突出部２７が形成されている。この突出部２７は、全体として前記軸線０を中心とする環状をなすものであり、その外周面は基体部２０の外径Ｄ１と同径とされて、基体部２０の外周面から段差なく連続する延長面となっており、また突出部２７の内周面は、軸線Ｏに直交する面に対して所定角度θで傾斜する傾斜面２７Ａとされている。 Tube end sealing member 15A, as shown in FIGS. 1 (A), (B) , a base portion 20 forming a larger diameter cylindrical outer diameter D 1, a relatively small diameter outer diameter D 2 The insertion portion 22 having a cylindrical shape is integrally formed of a hard metal such as carbon steel or die steel. Here, the insertion portion 22 is formed so as to protrude from the end surface (step surface 26) of the base portion 20 on the same axis as the axis O of the base portion 20. The step surface 26 is formed with a protrusion 27 that protrudes along the axial direction. The protruding portion 27 is for an annular around the axis 0 as a whole, the outer peripheral surface thereof is an outer diameter D 1 and the same diameter of the base portion 20, without the stepped from the outer circumferential surface of the base portion 20 The inner peripheral surface of the projecting portion 27 is an inclined surface 27A that is inclined at a predetermined angle θ with respect to a surface orthogonal to the axis O.

前記管端封止部材１５Ａの基体部２０は、その外径（突出部２７の外径と同じ）Ｄ１が、金型１（上型３及び下型５）における素材管挿入部位１Ａの内径（型締め時の内径）および素材管１１の管端部１３Ａの外径Ｄ０と実質的に同径となるように定められている。一方、挿入部２２は、その外径Ｄ２が、素材管１１の管端部１３Ａの内径Ｄ３よりも若干小さい径となるように定められている。したがって、管端封止部材１５Ａの挿入部２２を素材管１１の管端部１３Ａに挿入して、金型１を型締めした状態では、図１（Ａ）に示しているように、金型１の素材管端部支持部位１Ａの内面に、管端封止部材１５Ａの基体部２０の一部の外周面及び突出部２７の外周面と、素材管１１の管端部１３Ａの外周面とが密着すると同時に、管端封止部材１５Ａの挿入部２２の外周面と管端部１３Ａの内周面との間に、クリアランス３２が存在することになる。このクリアランス３２の寸法（間隔）Ｓは、Ｓ＝（Ｄ３−Ｄ２）／２となる。 Base portion 20 of the tube end sealing member 15A has an inner diameter of D 1 (the same as the outer diameter of the protruding portion 27) outer diameter, material tube insertion site 1A in the mold 1 (the upper mold 3 and lower mold 5) is defined such that (mold clamping when the inner diameter) and the outer diameter D 0 of the tube end portion 13A of the material pipe 11 substantially the same diameter. On the other hand, the insertion portion 22 has an outer diameter D 2 has been determined to be a smaller diameter slightly smaller than the inner diameter D 3 of the tube end portion 13A of the material pipe 11. Therefore, in a state where the insertion portion 22 of the tube end sealing member 15A is inserted into the tube end portion 13A of the material tube 11 and the mold 1 is clamped, as shown in FIG. 1 on the inner surface of the raw material tube end portion supporting portion 1A, a part of the outer peripheral surface of the base portion 20 of the tube end sealing member 15A and the outer peripheral surface of the projecting portion 27, At the same time, a clearance 32 exists between the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15A and the inner peripheral surface of the tube end portion 13A. The dimension (interval) S of the clearance 32 is S = (D 3 −D 2 ) / 2.

上述のような管端封止部材１５Ａを用いて、素材管１１の管端部１３Ａ、１３Ｂを封止すると同時に溶接用の傾斜状開先面を形成し、さらにハイドロフォーム加工を実施する状況について、以下に説明する。なお以下の説明では、素材管１１の両端の管端部１３Ａ、１３Ｂのうち、主として一方の管端部１３Ａの封止および傾斜状開先面形成についてのみ説明するが、他方の管端部１３Ｂの封止も同時に行なうのが通常であり、その管端部１３Ｂの封止についての図示および説明は省略する。またここで、前記他方の管端部１３Ｂの封止時には、同時にその他方の管端部１３Ｂに傾斜状開先面を形成する場合と、その他方の管端部１３Ｂに傾斜状開先面の形成を行なわない場合とがあるが、後者のケースについては、後に改めて説明する。   About the situation where the pipe end portions 13A and 13B of the material pipe 11 are sealed using the pipe end sealing member 15A as described above, and at the same time an inclined groove surface for welding is formed, and further hydroforming is performed. This will be described below. In the following description, among the tube end portions 13A and 13B at both ends of the material tube 11, only the sealing of the one tube end portion 13A and the formation of the inclined groove surface will be described, but the other tube end portion 13B is described. Is normally performed at the same time, and illustration and description of the sealing of the tube end portion 13B are omitted. Further, here, at the time of sealing the other tube end portion 13B, an inclined groove surface is simultaneously formed on the other tube end portion 13B, and an inclined groove surface is formed on the other tube end portion 13B. There are cases where the formation is not performed, but the latter case will be described later.

予め、適宜予備加工などが施された素材管１１を、その管端部１３Ａが金型１の下型５の所定位置（素材管端部支持部位１Ａ）に位置するようにセットし、素材管１１の管端部１３Ａに、管端封止部材１５Ａの挿入部２２を挿入し、続いて上型３を降下させて型締めを行なう。あるいはまた、適宜予備加工などが施された素材管１１の管端部１３Ａに、管端封止部材１５Ａの挿入用突出部２２を挿入し、続いて素材管１１を、その管端部１３Ａが金型１の下型５上にセットし、上型３を降下させ、型締めを行なっても良い。   A material tube 11 that has been preliminarily processed in advance is set so that its tube end 13A is positioned at a predetermined position (material tube end supporting portion 1A) of the lower mold 5 of the mold 1, and the material tube The insertion part 22 of the pipe end sealing member 15A is inserted into the 11 pipe end part 13A, and then the upper mold 3 is lowered to perform mold clamping. Alternatively, the protruding portion 22 for insertion of the tube end sealing member 15A is inserted into the tube end portion 13A of the material tube 11 that has been appropriately preliminarily processed, and then the material tube 11 is inserted into the tube end portion 13A. The mold 1 may be set on the lower mold 5, the upper mold 3 may be lowered, and the mold may be clamped.

このように型締めした段階では、金型１における素材管端部支持部位１Ａの内面に、管端封止部材１５Ａの基体部２０の一部（段差面２６に近い側の部分）および突出部２７の外周面と、素材管１１の管端部１３Ａの外周面とが密着する。なお、管端封止部材１５Ａの挿入部２２の外周面と素材管１１の内周面との間には、寸法Ｓのクリアランス３２が保たれている。   At the stage where the mold is clamped in this way, a part of the base 20 of the pipe end sealing member 15A (a part close to the step surface 26) and a protruding part are formed on the inner surface of the material pipe end supporting part 1A in the mold 1. 27 and the outer peripheral surface of the pipe end portion 13A of the material pipe 11 are in close contact with each other. A clearance 32 having a dimension S is maintained between the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15A and the inner peripheral surface of the material tube 11.

型締め後、管端封止部材１５Ａに、その軸線方向に沿った加圧力を加え、管端封止部材１５Ａの段差部２６によって、素材管１１の管端部１３Ａを軸線方向に沿って押圧する。この加圧力によって、先ず素材管１１の管端部１３Ａの端面の外周縁に管端封止部材１５Ａの突出部傾斜面２７Ａが当接して、管端部１３Ａの端面付近の部位が斜め内側に押し込まれるとともに、管端部１３Ａの長さ方向の一部分もしくは複数の箇所において、軸線方向に圧縮変形され、肉厚が増加する。
このとき、管端部１３Ａの端面には、突出部傾斜面２７Ａにより斜め内側への力が加えられ、しかも管端部１３Ａの外周面は金型１の内面により拘束されているから、管端部１３Ａは、その内周面が内側に***する方向に変形する。そして、その***部分３４の高さが、前記クリアランス３２の寸法Ｓに達すれば、***部分３４が、管端封止部材１５Ａの挿入部２２の外周面に接する状態となる。さらに管端封止部材１５Ａに対する軸線方向加圧を継続すれば、管端部１３Ａの内側の***部分３４が挿入部２２の外周面に密着する。この***部分３４は、管端部１３Ａの周方向に沿って環状に連続しているから、***部分３４と挿入部２２の外周面との密着によって、素材管１１の管端部１３Ａが封止される。同時に、管端封止部材１５Ａの突出部傾斜面２７Ａによって押し込まれた部分の表面が、突出部傾斜面２７Ａに沿って角度θで傾斜する面、すなわち傾斜状開先面２９となる（図３参照）。 After clamping, pressure is applied along the axial direction to the pipe end sealing member 15A, and the pipe end 13A of the material pipe 11 is pressed along the axial direction by the step portion 26 of the pipe end sealing member 15A. To do. With this applied pressure, first, the projecting portion inclined surface 27A of the tube end sealing member 15A comes into contact with the outer peripheral edge of the end surface of the tube end portion 13A of the material tube 11, and the portion near the end surface of the tube end portion 13A is inclined inwardly. While being pushed in, the pipe end portion 13A is compressed and deformed in the axial direction at one or a plurality of locations in the length direction, and the wall thickness increases.
At this time, since an inward force is applied to the end surface of the tube end portion 13A by the projecting portion inclined surface 27A, and the outer peripheral surface of the tube end portion 13A is constrained by the inner surface of the mold 1, The part 13A is deformed in a direction in which the inner peripheral surface protrudes inward. When the height of the raised portion 34 reaches the dimension S of the clearance 32, the raised portion 34 comes into contact with the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15A. Further, if the axial pressure on the tube end sealing member 15 </ b> A is continued, the raised portion 34 inside the tube end portion 13 </ b> A comes into close contact with the outer peripheral surface of the insertion portion 22. Since the raised portion 34 is annularly continuous along the circumferential direction of the tube end portion 13A, the tube end portion 13A of the material tube 11 is sealed by the close contact between the raised portion 34 and the outer peripheral surface of the insertion portion 22. Is done. At the same time, the surface of the portion pushed by the protruding portion inclined surface 27A of the pipe end sealing member 15A becomes a surface inclined at an angle θ along the protruding portion inclined surface 27A, that is, an inclined groove surface 29 (FIG. 3). reference).

上述のような、素材管１１の一方の管端部１３Ａについての管端封止部材１５Ａによる封止および傾斜状開先面の形成と同時に、素材管１１の他方の管端部１３Ｂについての管端封止部材１５Ｂによる封止および傾斜状開先面の形成を行い、両端の管端部１３Ａ，１３Ｂの封止および傾斜状開先面形成が完了した後には、図６に示したように、素材管１１内に、加圧用液体、例えば水を、一方の管端封止部材１５Ａの導入路１７を介して導入する。なおこの段階では、他方の管端封止部材の導出路１９は開放しておき、素材管内への加圧用液体の導入に伴って、素材管１１内に存在していた空気を導出路１９から外部へ追い出すのが通常である。   Simultaneously with the tube end sealing member 15A for the one tube end portion 13A of the material tube 11 and the formation of the inclined groove surface, the tube for the other tube end portion 13B of the material tube 11 as described above. As shown in FIG. 6, after the end sealing member 15B is sealed and the inclined groove surface is formed, and the end portions 13A and 13B are sealed and the inclined groove surface is formed. Then, a pressurizing liquid, for example, water is introduced into the material pipe 11 through the introduction path 17 of the one pipe end sealing member 15A. At this stage, the lead-out path 19 of the other pipe end sealing member is opened, and the air existing in the material pipe 11 is introduced from the lead-out path 19 with the introduction of the pressurizing liquid into the material pipe. It is normal to drive out.

素材管１１内に加圧用液体を充填した後には、導出路１９を閉止して、加圧用液体に、液圧成形のための高圧を加えるとともに、管端封止部材１５Ａ、１５Ｂに、図示しない油圧装置などによって、軸線方向に沿う加圧力を加え（軸押しし）、金型１内の素材管１１を、その外面が金型１の内面形状に沿うように塑性変形させる。   After the material pipe 11 is filled with the pressurizing liquid, the outlet path 19 is closed, and a high pressure for hydraulic forming is applied to the pressurizing liquid, and the pipe end sealing members 15A and 15B are not illustrated. A pressing force along the axial direction is applied (axially pressed) by a hydraulic device or the like, and the material pipe 11 in the mold 1 is plastically deformed so that the outer surface thereof conforms to the inner surface shape of the mold 1.

このようにして金型１内で成形した後には、常法に従って液圧付与を停止させるとともに、軸押し加圧力を解除し、金型１を開放する。またそれに前後して素材管１１内の加圧用液体を排出し、成形品を金型１から取り出して、管端封止部材１５Ａ、１５Ｂを素材管１１から取り外せば、一連のハイドロフォーム加工プロセスが終了し、管端部に傾斜状開先面２９を有する中空部材が得られる。   Thus, after shaping | molding in the metal mold | die 1, while applying a hydraulic pressure according to a conventional method, a shaft pushing pressure is cancelled | released and the metal mold | die 1 is open | released. Further, before and after that, if the pressurizing liquid in the material tube 11 is discharged, the molded product is taken out from the mold 1 and the tube end sealing members 15A and 15B are removed from the material tube 11, a series of hydroforming processes are performed. When finished, a hollow member having an inclined groove surface 29 at the end of the tube is obtained.

上述のようにしてハイドロフォーム加工によって所定の形状に成形された中空部材３８の管端部１３Ａの一例を図２に示す。図２に示すように、管端部１３Ａの端面には、その周方向に沿って連続角度θで傾斜する傾斜状開先面２９が、周方向に沿って連続して形成されている。またその中空部材３８を、同一の管端部形状、寸法を有する他の中空部材３８´と溶接する際の溶接継手部分の一例を図３に示す。なお図３では、Ｖ型の開先３６を構成して突合せ溶接する場合を示している。この場合、溶接継手部分におけるＶ型開先３６の開先角度φは、傾斜状開先面２９の傾斜角度（＝管端封止部材傾斜面の傾斜角度）θの２倍となる。   An example of the tube end portion 13A of the hollow member 38 formed into a predetermined shape by hydroforming as described above is shown in FIG. As shown in FIG. 2, an inclined groove surface 29 that is inclined at a continuous angle θ along the circumferential direction is continuously formed along the circumferential direction on the end surface of the tube end portion 13A. FIG. 3 shows an example of a welded joint portion when the hollow member 38 is welded to another hollow member 38 ′ having the same pipe end shape and dimensions. FIG. 3 shows a case where a V-shaped groove 36 is formed and butt welding is performed. In this case, the groove angle φ of the V-shaped groove 36 in the weld joint portion is twice the inclination angle of the inclined groove surface 29 (= inclination angle of the tube end sealing member inclined surface) θ.

ここで、管端封止のために管端部１３Ａの端面を軸線方向に沿って加圧して、管端部１３Ａを塑性変形させたときの変形は、提灯座屈に似た形態となるが、通常の提灯座屈は、管がその軸線方向に沿った加圧によって、蛇腹状に変形することを指称している。すなわち、一般的な提灯座屈は、蛇腹状の変形によって内周面と外周面との両面側に管壁が交互に突出、陥没する変形態様となる。しかしながら、本発明の場合、管端封止部材１５Ａの突出部傾斜面２７Ａによって管端部１３Ａの端面付近が斜め内側に押圧され、しかも素材管１１の管端部１３Ａの外周面は、金型１の素材管端部支持部位１Ａの内面によって拘束されているため、通常の提灯座屈とは異なり、管端部１３Ａの外周面の変形は発生せず、もっぱら内面側へ***する変形のみが生じる。したがって、管端部１３Ａの外周面は平滑な状態を保ち、成形後の成形品として、管端部１３Ａの外周面の外観不良が生じるおそれは少ない。   Here, the deformation when the end surface of the tube end portion 13A is pressurized along the axial direction to seal the tube end and the tube end portion 13A is plastically deformed is similar to a lantern buckling. Ordinary lantern buckling indicates that the tube is deformed into a bellows shape by pressurization along its axial direction. That is, general lantern buckling is a deformation mode in which the tube wall alternately protrudes and sinks on both sides of the inner peripheral surface and the outer peripheral surface due to bellows-like deformation. However, in the case of the present invention, the vicinity of the end surface of the tube end portion 13A is pressed diagonally inward by the protruding portion inclined surface 27A of the tube end sealing member 15A, and the outer peripheral surface of the tube end portion 13A of the material tube 11 is a mold. Unlike the normal lantern buckling, the outer peripheral surface of the tube end portion 13A is not deformed, and only the deformation that rises to the inner surface side is limited. Arise. Accordingly, the outer peripheral surface of the pipe end portion 13A is kept smooth, and there is little possibility that a defective appearance of the outer peripheral surface of the pipe end portion 13A will occur as a molded product after molding.

素材管１１の管端部１３Ａ（１３Ｂ）の外径Ｄ０は、通常は１０．０〜３０．０ｍｍ程度のことが多く、また管端部１３Ａ（１３Ｂ）の肉厚Ｔ（＝Ｄ０／２−Ｄ３／２）は、２．０〜１５．０ｍｍ程度とされるのが通常である。またその場合、管端封止時における管端封止部材１５Ａ（１５Ｂ）の挿入部２２の外周面と管端部１３Ａ（１３Ｂ）の内周面との間のクリアランス３２の寸法Ｓは、特に限定されるものではないが、通常は０〜０．５ｍｍ程度とすることが好ましい。したがって管端封止部材基体部２０の外径Ｄ１および挿入部２２の外径Ｄ２も、素材管１１の管端部の外径Ｄ０および肉厚Ｔに応じ、適切な寸法Ｓのクリアランス３２が確保できるように定めればよい。 The outer diameter D 0 of the pipe end portion 13A (13B) of the material pipe 11 is usually about 10.0 to 30.0 mm in many cases, and the wall thickness T (= D 0 / of the pipe end portion 13A (13B). 2-D 3/2), it is usually being about 2.0～15.0Mm. In that case, the dimension S of the clearance 32 between the outer peripheral surface of the insertion portion 22 of the pipe end sealing member 15A (15B) and the inner peripheral surface of the pipe end portion 13A (13B) at the time of pipe end sealing is particularly Although it is not limited, it is usually preferable to be about 0 to 0.5 mm. Thus the outer diameter D 2 of the outer diameter D 1 and the insertion portion 22 of the pipe end sealing member base portion 20 also, depending on the outer diameter D 0 and a wall thickness T of the pipe end portion of the material pipe 11, suitably sized S clearance What is necessary is just to determine so that 32 can be ensured.

但し、これらの各寸法は、それぞれ独立に定めるのではなく、相互の関係の下に定めることが好ましい。
例えば、管端封止時における管端封止部材１５Ａ（１５Ｂ）における挿入部２２の外周面と素材管１１の管端部１３Ａ（１３Ｂ）の内周面との間のクリアランス３２の寸法Ｓと、素材管１１の管端部１３Ａ（１３Ｂ）の厚みＴとは、
０≦Ｓ≦０．２×Ｔ・・・・・・（１）
の条件を満たすことが好ましい。 However, it is preferable that these dimensions are determined independently of each other, not independently.
For example, the dimension S of the clearance 32 between the outer peripheral surface of the insertion portion 22 and the inner peripheral surface of the tube end portion 13A (13B) of the material pipe 11 in the tube end sealing member 15A (15B) at the time of tube end sealing. The thickness T of the tube end 13A (13B) of the material tube 11 is
0 ≦ S ≦ 0.2 × T (1)
It is preferable to satisfy the following condition.

ここで、式（１）において、クリアランスの寸法Ｓが、０．２×Ｔより大きくなれば、封止のための加圧時において、管端部の内周面の***部分を管端封止部材の挿入部の外周面に充分に密着させることが困難となり、そのため、シール効果が充分に得られなくなったり、あるいは、管端部が蛇腹状に変形したりして、管端部の外周面の外観不良が生じてしまうおそれがある。一方、クリアランスの寸法Ｓが、０未満では、管端部において素材管が変形せずに、封止すべき管端部以外の部分（管端部よりも金型内側の成形用キャビティ内の部分）で素材管が変形してしまい、その後の高圧の液圧付与・軸押しによる本来の成形時に、成形不良が発生してしまうおそれがある。   Here, in the equation (1), if the clearance dimension S is larger than 0.2 × T, the protruding portion of the inner peripheral surface of the tube end portion is sealed at the tube end during pressurization for sealing. It becomes difficult to sufficiently adhere to the outer peripheral surface of the insertion portion of the member, so that a sufficient sealing effect cannot be obtained, or the tube end portion deforms into a bellows shape, and the outer peripheral surface of the tube end portion There is a risk that a poor appearance will occur. On the other hand, if the clearance dimension S is less than 0, the material pipe does not deform at the pipe end, and the part other than the pipe end to be sealed (the part in the molding cavity inside the mold from the pipe end) ), The material tube is deformed, and there is a risk that a molding defect may occur during the original molding by applying a high pressure and pushing the shaft.

一方、管端封止部材１５Ａの突出部傾斜面２７Ａの傾斜角度θの具体的角度は特に限定されるものではない。この突出部傾斜面２７Ａの傾斜角度θは、成形後の中空部材における管端部１３Ａの端面の傾斜状開先面２９の角度と等しいから、要は、成形後の中空部材の管端部１１Ａを相手材と溶接する際において、その溶接継手に必要とされる開先角度に対応して定めればよい。例えば図３に示すようなＶ形開先３６を構成する場合には、開先角度φの１／２の角度となるように、傾斜角度θを定めておけばよい。またレ形開先を構成する場合には、必要な開先角度と同じ角度に前記傾斜角度θを定めておけばよい。   On the other hand, the specific angle of the inclination angle θ of the protruding portion inclined surface 27A of the tube end sealing member 15A is not particularly limited. Since the inclination angle θ of the projecting portion inclined surface 27A is equal to the angle of the inclined groove surface 29 of the end surface of the tube end portion 13A in the molded hollow member, the main point is the tube end portion 11A of the molded hollow member. May be determined in accordance with the groove angle required for the welded joint. For example, when a V-shaped groove 36 as shown in FIG. 3 is configured, the inclination angle θ may be determined so that the angle is ½ of the groove angle φ. Further, in the case of forming a ledge groove, the inclination angle θ may be set to the same angle as a necessary groove angle.

以上の実施形態においては、図１（Ａ）、（Ｂ）に示しているように、管端封止部材１５Ａの突出部２７は、段差部分２６の前面の一部（外周端側の部分）から突出する形状とし、その段差部分２６の内周端側の部分に、軸線方向に対し直交する垂直面２６Ａを残している。これは、図２に示しているように、溶接時における開先に、相手材の表面に対して平行に対向する面、すなわちルート面３５が存在するように、傾斜状開先面２９を形成するためである。しかしながら、溶接の条件などによっては、ルート面３５を持たない開先形状とすることが望まれる場合もある。そこで本発明の方法の場合も、ルート面３５を持たない開先形状を構成し得るようにしてもよい。その場合の例を、図４（Ａ）、（Ｂ）に示す。なお図４（Ａ）、（Ｂ）において、図１（Ａ）、（Ｂ）に示される要素と同一の要素については、図１（Ａ）、（Ｂ）と同一の符号を付し、その説明は省略する。
図４（Ａ）、（Ｂ）において、管端封止部材１５Ａには、段差部分２６の前面の全体が傾斜面２７Ａとなるように突出部２７が形成されている。このような管端封止部材１５Ａを用いた場合においても、図１（Ａ）、（Ｂ）に示した実施形態と同様に、管端部１３Ａを封止すると同時に、傾斜状開先面３６（但し図２とは異なり、ルート面３５がないもの）を形成することができる。 In the above embodiment, as shown in FIGS. 1A and 1B, the protruding portion 27 of the tube end sealing member 15A is a part of the front surface of the step portion 26 (portion on the outer peripheral end side). A vertical surface 26A that is orthogonal to the axial direction is left in the portion on the inner peripheral end side of the stepped portion 26. This is because, as shown in FIG. 2, an inclined groove surface 29 is formed so that a surface facing the surface of the counterpart material in parallel with the groove at the time of welding, that is, a root surface 35 exists. It is to do. However, depending on welding conditions, it may be desired to have a groove shape without the root surface 35. Therefore, in the case of the method of the present invention, a groove shape without the route surface 35 may be configured. An example in that case is shown in FIGS. 4 (A) and 4 (B), the same elements as those shown in FIGS. 1 (A) and 1 (B) are denoted by the same reference numerals as those in FIGS. 1 (A) and 1 (B). Description is omitted.
4A and 4B, a protruding portion 27 is formed on the tube end sealing member 15A so that the entire front surface of the stepped portion 26 becomes an inclined surface 27A. Even when such a tube end sealing member 15A is used, the inclined groove surface 36 is simultaneously sealed at the same time as the tube end 13A is sealed, as in the embodiment shown in FIGS. (However, unlike FIG. 2, there is no route surface 35).

さらに、成形後の中空部材の用途、適用個所などによっては、その中部材の両端の管端部１３Ａ、１３Ｂのうち、一方（例えば１３Ａ）のみに傾斜状開先面２９を形成しておけば足りることもある。その場合は、一方の管端部１３Ａについては、前述のような突出部傾斜面２７Ａを有する管端封止部材１５Ａを用いて封止および開先面形成を行い、他方の管端部１３Ｂについては、突出部２７および傾斜面２７Ａを持たない管端封止部材１５Ｂを用いて、封止のみを行なってもよい。
その場合における、他方の管端部１３Ｂについての管端封止部材１５Ｂと、それによる封止状況の例を、図５の（Ａ）、（Ｂ）に示す。なお図５（Ａ）、（Ｂ）において、図１（Ａ）、（Ｂ）に示される要素と同一の要素については、図１（Ａ）、（Ｂ）と同一の符号を付し、その説明は省略する。 Further, depending on the use and application location of the hollow member after molding, the inclined groove surface 29 may be formed only on one (for example, 13A) of the tube end portions 13A and 13B at both ends of the inner member. Sometimes it is enough. In that case, about one pipe end part 13A, sealing and groove face formation are performed using the pipe end sealing member 15A having the protruding part inclined surface 27A as described above, and about the other pipe end part 13B. May be sealed only by using the tube end sealing member 15B that does not have the protruding portion 27 and the inclined surface 27A.
An example of the tube end sealing member 15B for the other tube end portion 13B and the sealing state thereby is shown in FIGS. 5 (A) and 5 (B), the same elements as those shown in FIGS. 1 (A) and 1 (B) are denoted by the same reference numerals as those in FIGS. 1 (A) and 1 (B). Description is omitted.

図５（Ａ）、（Ｂ）において、管端封止部材１５Ｂは、基体部２０と挿入部２２との間の段差部分２６は、軸線に対して直交する面（垂直段差面）３７によって構成されており、前記各実施形態で示した突出部は形成されていない。但し、管端封止部材１５Ｂの基体部２０の外径Ｄ１が、金型１（上型３及び下型５）における素材管挿入部位１Ａの内径（型締め時の内径）および素材管１１の管端部１３Ｂの外径Ｄ０と実質的に同径となるように定められている点、また挿入部２２の外径Ｄ２が、素材管１１の管端部１３Ｂの内径Ｄ３よりも若干小さい径となるように定められている点は、図１（Ａ）、（Ｂ）に示した実施形態と同様であり、したがって管端封止部材１５Ａの挿入部２２を素材管１１の管端部１３Ｂに挿入して、金型１を型締めした状態では、金型１の素材管端部支持部位１Ａの内面に、管端封止部材１５Ｂの基体部２０の一部の外周面と、素材管１１の管端部１３Ｂの外周面とが密着すると同時に、管端封止部材１５Ｂの挿入部２２の外周面と管端部１３Ｂの内周面との間に、クリアランス３２が存在することになる。このクリアランス３２の寸法（間隔）Ｓは、Ｓ＝（Ｄ３−Ｄ２）／２となる。 5A and 5B, in the tube end sealing member 15B, the step portion 26 between the base portion 20 and the insertion portion 22 is constituted by a surface (vertical step surface) 37 orthogonal to the axis. The protrusions shown in the above embodiments are not formed. However, the outer diameter D 1 of the base portion 20 of the pipe end sealing member 15B is, (the inner diameter at the mold clamping) the inner diameter of the material pipe insertion site 1A in the mold 1 (the upper mold 3 and lower mold 5) and material pipe 11 The outer diameter D 2 of the insertion tube 22 is determined to be substantially the same as the outer diameter D 0 of the tube end portion 13 B of the tube tube 13 and the inner diameter D 3 of the tube end portion 13 B of the material tube 11. 1 is also the same as the embodiment shown in FIGS. 1A and 1B, and therefore the insertion portion 22 of the pipe end sealing member 15A is made to be the same as that of the material pipe 11. In a state where the mold 1 is inserted into the tube end portion 13B and the mold 1 is clamped, a part of the outer peripheral surface of the base portion 20 of the tube end sealing member 15B is formed on the inner surface of the material tube end support portion 1A of the mold 1. And the outer peripheral surface of the tube end portion 13B of the material pipe 11 are in close contact with each other, and at the same time, the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15B and the pipe end portion. A clearance 32 exists between the inner peripheral surface of 13B. The dimension (interval) S of the clearance 32 is S = (D 3 −D 2 ) / 2.

このような管端封止部材１５Ｂを用いた側の管端部１３Ｂの封止状況は、次の通りである。
すなわち、既に述べたように、液圧付与および軸押し以前の段階で、素材管１１を金型にセットして型締めした後、管端封止部材１５Ｂの側から軸線方向に沿った加圧力が加えられれば、管端封止部材１５Ｂの垂直段差面３７によって、素材管１１の端面が軸線方向に沿って押圧される。この加圧力によって、素材管１１の管端部１３Ｂは、長さ方向の一部分もしくは数箇所において、肉厚が増加する方向に圧縮変形する。このとき、管端部１３Ｂの外周面は、図５の（Ｂ）に示しているように、金型１における素材管端部支持部位１Ｂの内面により拘束されているから、管端部１３Ｂの変形は、その内周面が内側に***する方向に生じる。そして、その***部分３４の高さが、前記クリアランス３２の寸法Ｓに達すれば、***部分３４が、管端封止部材１５Ｂの挿入部２２の外周面に接する状態となる。さらに管端封止部材１５Ｂに対する軸線方向加圧を継続すれば、管端部１３Ｂの内側の***部分３４が挿入部２２の外周面に密着する。この***部分３４は、管端部１３Ｂの周方向に沿って環状に連続しているから、***部分３４と挿入用突出部２２の外周面との密着によって、素材管１１の管端部１３Ｂが封止される。 The sealing state of the tube end portion 13B on the side using such a tube end sealing member 15B is as follows.
That is, as already described, after the material tube 11 is set in the mold and clamped before the hydraulic pressure is applied and the shaft is pushed, the pressure applied along the axial direction from the tube end sealing member 15B side. Is added, the end surface of the material tube 11 is pressed along the axial direction by the vertical step surface 37 of the tube end sealing member 15B. By this applied pressure, the pipe end portion 13B of the material pipe 11 is compressed and deformed in a direction in which the wall thickness increases in a part or several places in the length direction. At this time, the outer peripheral surface of the tube end portion 13B is constrained by the inner surface of the material tube end portion supporting portion 1B in the mold 1 as shown in FIG. Deformation occurs in the direction in which the inner peripheral surface rises inward. When the height of the raised portion 34 reaches the dimension S of the clearance 32, the raised portion 34 comes into contact with the outer peripheral surface of the insertion portion 22 of the tube end sealing member 15B. Furthermore, if the axial pressure on the tube end sealing member 15B is continued, the raised portion 34 inside the tube end portion 13B is brought into close contact with the outer peripheral surface of the insertion portion 22. Since this raised portion 34 is annularly continuous along the circumferential direction of the tube end portion 13B, the tube end portion 13B of the material tube 11 is brought into close contact with the outer circumferential surface of the raised portion 34 and the insertion protrusion 22. Sealed.

このように、突出部２７および傾斜面２７Ａを持たない管端封止部材１５Ｂを用いて素材管１１の管端部１３Ｂを封止する場合も、素材管１１の管端部１３Ｂの外周面は、金型１の素材管端部支持部位１Ｂの内面によって拘束されているため、通常の提灯座屈とは異なり、管端部１３Ｂの外周面の変形はほとんど発生せず、もっぱら内面側へ***する変形のみが生じる。したがって、管端部１３Ｂの外周面は平滑な状態を保ち、成形後の成形品として、管端部１３Ｂの外周面の外観不良が生じるおそれは少ない。   Thus, even when the tube end portion 13B of the material tube 11 is sealed using the tube end sealing member 15B that does not have the protruding portion 27 and the inclined surface 27A, the outer peripheral surface of the tube end portion 13B of the material tube 11 is Since the material 1 is constrained by the inner surface of the tube end support part 1B of the mold 1, unlike the normal lantern buckling, the outer peripheral surface of the tube end 13B hardly deforms and rises exclusively to the inner surface side. Only deformation that occurs. Therefore, the outer peripheral surface of the tube end portion 13B is kept in a smooth state, and there is little possibility that an appearance defect of the outer peripheral surface of the tube end portion 13B will occur as a molded product after molding.

なお、以上の各実施形態では、素材管を金型にセットし、型締めしてから管端部の封止および傾斜状開先面の形成を行い、その後、型締め状態を維持したまま、加圧用液体の充填、さらに加圧用液体に対する高圧付与・軸押しを行なうものとしている。しかしながら、場合によっては、素材管を金型にセットして型締めし、管端部の封止および傾斜状開先面の形成を行なった後、一旦型締めを解除して、素材管を金型から取り出し、素材管に対する予備加工などを行ってから、改めて素材管を金型にセットし、再び型締めを行なってから、加圧用液体の充填、さらに加圧用液体に対する高圧付与・軸押しを行なっても良い。さらに、管端部の封止のための金型として、成形用の金型とは別の封止専用の金型を用意しておき、その封止専用の金型に素材管をセットして型締めし、管端部の封止および傾斜状開先面の形成を行なった後、成形用の金型に素材管をセットし、型締め後、加圧用液体の充填、さらに加圧用液体に対する高圧付与・軸押しを行なっても良い。   In each of the above embodiments, the material pipe is set in a mold, and after clamping the mold, the end of the pipe is sealed and the inclined groove surface is formed, and then the clamped state is maintained, It is assumed that the pressurizing liquid is filled, and that the pressurizing liquid is applied with a high pressure and a shaft is pressed. However, in some cases, the material tube is set in a mold and clamped, the end of the tube is sealed, and the inclined groove surface is formed. After removing from the mold, pre-processing the material pipe, etc., set the material pipe in the mold again, tighten the mold again, and then fill the pressurizing liquid, and then apply high pressure to the pressurizing liquid and push the shaft. You can do it. In addition, as a mold for sealing the tube end, prepare a mold dedicated for sealing separate from the mold for molding, and set the material tube in the mold dedicated for sealing After clamping, sealing the end of the tube and forming the inclined groove surface, set the material tube in the molding die, and after filling the mold, fill with the pressurizing liquid and further against the pressurizing liquid High pressure application and shaft pushing may be performed.

以下に本発明の実施例を示す。なお以下の実施例は、本発明による作用、効果を確認するためのものであり、実施例に記載した条件が、本発明の技術的範囲を限定するものでないことはもちろんである。   Examples of the present invention are shown below. In addition, the following examples are for confirming the operation and effect of the present invention, and it is needless to say that the conditions described in the examples do not limit the technical scope of the present invention.

ハイドロフォーム加工装置としては、その全体構成が図２に示すような装置を用いた。素材管としては、管端部の外径Ｄ０が１９０．７ｍｍ、肉厚Ｔが７．０ｍｍ、内径Ｄ３が１７６．７ｍｍの、機械構造用炭素鋼管：ＳＴＫＭ１３Ｂからなる中空管を用いた。一方管端封止部材としては、図１に示すような形状で、基体部の外径Ｄ１が１９０．７ｍｍ、挿入部の外径Ｄ２が１７５．７ｍｍのダイス鋼：ＳＫＤ６１製のものを用いた。したがって、クリアランスの寸法Ｓは０．５ｍｍとなる。なお突出部の突出量は１０．０ｍｍ、傾斜面の傾斜角度θは４５°とした。
このような管端封止部材の挿入部を素材管の両端に挿入して、金型にセットし、型締めを行なってから、管端封止部材に軸線方向に、５００ｋＮの加圧力を加えて、管端部を、その外周面を拘束しながら軸線方向に沿って押圧した。これによって管端部の端面を斜め内側に押圧して傾斜状開先面を形成すると同時に、管端部の内周側が***するように塑性変形させ、その***部分を管端封止部材の挿入部の外周面に密着させた。
以上のようにして両端を封止した素材管内に、加圧用液体として水を充填し、その後、加圧力１５００ｋＮにて軸押ししながら、素材管内の加圧用液体に５０ＭＰaの圧力を加え、ハイドロフォーム加工を行った。
この過程では、管端封止部材の個所からの加圧用液体の漏洩はなく、確実に封止されていることが確認された。また、成形後の成形品を調べたところ、管端部の端面に、角度θで傾斜する傾斜状開先面が周方向に均一に形成されており、また全体として金型のキャビティ内面に沿った形状に精確に加工されていることが確認された。また上記の傾斜状開先面を含む管端部の外面には、特に凹凸や皺の発生もなく、良好な外観品質を有していることが確認された。 As the hydroforming apparatus, an apparatus having an overall configuration as shown in FIG. 2 was used. The material tube, the outer diameter D 0 of the tube end is 190.7Mm, thickness T is 7.0 mm, an inner diameter D 3 is 176.7Mm, mechanical structural carbon steel: using a hollow tube made STKM13B . The contrast tube end sealing member, a shape as shown in FIG. 1, the base portion of the outer diameter D 1 is 190.7Mm, the insertion portion of the outer diameter D 2 is 175.7mm die steel: SKD61 steel ones Using. Therefore, the clearance dimension S is 0.5 mm. The protruding amount of the protruding portion was 10.0 mm, and the inclined angle θ of the inclined surface was 45 °.
Insert these tube end sealing member inserts into both ends of the material tube, set it in the mold, perform clamping, and then apply a pressure of 500 kN to the tube end sealing member in the axial direction. Then, the tube end portion was pressed along the axial direction while restraining the outer peripheral surface thereof. As a result, the end face of the pipe end is pressed obliquely inward to form an inclined groove face, and at the same time, plastic deformation is performed so that the inner peripheral side of the pipe end rises, and the raised portion is inserted into the pipe end sealing member. It was made to adhere to the outer peripheral surface of the part.
The material tube with both ends sealed as described above is filled with water as a pressurizing liquid, and then a pressure of 50 MPa is applied to the pressurizing liquid in the material tube while axially pushing at a pressure of 1500 kN. Processing was performed.
In this process, it was confirmed that there was no leakage of the pressurizing liquid from the location of the tube end sealing member, and the tube was securely sealed. Further, when the molded product after the molding was examined, an inclined groove surface inclined at an angle θ was uniformly formed on the end surface of the tube end portion in the circumferential direction, and the entire inner surface of the mold cavity along the cavity surface. It was confirmed that it was precisely processed into the desired shape. Further, it was confirmed that the outer surface of the tube end portion including the above-described inclined groove surface has a good appearance quality with no irregularities and wrinkles.

以上、本発明の好ましい実施形態、実施例を説明したが、本発明はこれらの実施形態、実施例に限定されないことはもちろんであり、本発明の趣旨を逸脱しない範囲で、構成の付加、省略、置換、およびその他の変更が可能である。   The preferred embodiments and examples of the present invention have been described above, but the present invention is not limited to these embodiments and examples, and additions and omissions of configurations are within the scope of the present invention. , Substitutions, and other changes are possible.

本発明の中空部材製造方法は、自動車などに使用される中空部品、特にアーク溶接などの溶接が施されて使用される中空部品の製造方法として、高圧の液圧を加えて複雑な形状を有する部品を製造する場合などに適している。   The hollow member manufacturing method of the present invention has a complicated shape by applying high hydraulic pressure as a manufacturing method of hollow parts used in automobiles and the like, especially hollow parts used by welding such as arc welding. This is suitable for manufacturing parts.

１ 金型
１Ａ、１Ｂ 素材管端部支持部位
１１ 素材管
１３Ａ、１３Ｂ 管端部
１５Ａ、１５Ｂ 管端封止部材
２０ 基体部
２２ 挿入部
２６ 段差部分
２７ 突出部
２７Ａ 傾斜面
２９ 傾斜状開先面
３２ クリアランス
３４ ***部分 DESCRIPTION OF SYMBOLS 1 Metal mold | die 1A, 1B Material pipe | tube edge part support part 11 Material pipe | tube 13A, 13B Pipe edge part 15A, 15B Pipe | line end sealing member 20 Base part 22 Insertion part 26 Step part 27 Projection part 27A Inclined surface 29 Inclined groove surface 32 Clearance 34 Raised part

Claims (1)

中空管状をなす素材管の両端部を、軸押し部材を兼ねる管端封止部材によりシールし、その素材管を金型内に配置して、素材管の内側空間に液圧を加えるとともに、素材管の両端部からその軸線に沿った方向に加圧して、素材管を金型のキャビティ内面に沿った形状に成形するハイドロフォーム加工を適用して、中空部材を製造する方法において、
前記管端封止部材として、外径が素材管の外径に等しい基体部と、その基体部から突出しかつ外径が素材管の管端部の内径より小さい挿入部と、前記基体部の外周面と挿入部の外周面との間の段差部分から軸線方向に沿って突出する突出部とを有し、かつその突出部の内周側に、所定角度で傾斜する傾斜面が形成された封止部材を用い、
素材管内に成形のための液圧を加える以前の段階で、前記管端封止部材の挿入部を素材管の管端部内に挿入するとともに、素材管を、その管端部の外周面が金型の素材管端部支持部位の内面に接するように金型内に配置した状態で、管端封止部材に軸線方向に沿う加圧力を加えて、管端封止部材の傾斜面を含む段差部分により素材管の管端部の端面を加圧し、
これにより素材管の管端部に前記傾斜面に沿う溶接用の傾斜状開先部を形成すると同時に、管端部の内周面の少なくとも一部が内側に***するように塑性変形させて、その***部分を前記挿入部の外周面に密着させることによって管端部を封止し、
その後、素材管内に成形のための液圧を加えるとともに、素材管に軸線方向に沿った成形用加圧力を加えることを特徴とする、ハイドロフォーム加工による溶接用中空部材の製造方法。 Both ends of the material tube forming a hollow tube are sealed by a tube end sealing member that also serves as a shaft pushing member, the material tube is placed in a mold, and hydraulic pressure is applied to the inner space of the material tube. In a method of manufacturing a hollow member by applying a hydroforming process in which a material pipe is molded into a shape along the cavity inner surface of a mold by pressing in a direction along the axis from both ends of the pipe,
As the tube end sealing member, a base portion having an outer diameter equal to the outer diameter of the material tube, an insertion portion protruding from the base portion and having an outer diameter smaller than the inner diameter of the tube end portion of the material tube, and an outer periphery of the base portion A projecting portion projecting along the axial direction from a step portion between the surface and the outer peripheral surface of the insertion portion, and an inclined surface inclined at a predetermined angle is formed on the inner peripheral side of the projecting portion. Using a stop member,
Before the hydraulic pressure for molding is applied to the raw material pipe, the insertion portion of the pipe end sealing member is inserted into the pipe end portion of the raw material pipe, and the outer peripheral surface of the pipe end portion is made of gold. A step including an inclined surface of the tube end sealing member by applying a pressing force along the axial direction to the tube end sealing member in a state of being arranged in the mold so as to be in contact with the inner surface of the material tube end supporting portion of the mold Press the end face of the tube end of the material pipe with the part,
Thereby, at the same time as forming the inclined groove portion for welding along the inclined surface in the tube end portion of the material tube, plastic deformation so that at least a part of the inner peripheral surface of the tube end portion protrudes inward, Sealing the tube end by bringing the raised portion into close contact with the outer peripheral surface of the insertion portion,
Then, while applying the hydraulic pressure for shaping | molding in a raw material pipe | tube, the pressurizing force for shaping | molding along an axial direction is applied to a raw material pipe | tube, The manufacturing method of the hollow member for welding by hydroforming characterized by the above-mentioned.
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