JPH09166111A - Connecting method of metallic hollow members with each other - Google Patents
Connecting method of metallic hollow members with each otherInfo
- Publication number
- JPH09166111A JPH09166111A JP7324789A JP32478995A JPH09166111A JP H09166111 A JPH09166111 A JP H09166111A JP 7324789 A JP7324789 A JP 7324789A JP 32478995 A JP32478995 A JP 32478995A JP H09166111 A JPH09166111 A JP H09166111A
- Authority
- JP
- Japan
- Prior art keywords
- hollow member
- hollow
- inserting holes
- cross
- side frame
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/012—Hollow or tubular elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/80—Manufacturing procedures
- B60G2206/82—Joining
- B60G2206/8209—Joining by deformation
Landscapes
- Body Structure For Vehicles (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、自動車フレーム
やはしご等において、二つの金属製中空材を交差状態に
接合するのに用いられる金属製中空材同士の接合方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining metal hollow materials used for joining two metal hollow materials in an intersecting state in an automobile frame, a ladder or the like.
【０００２】[0002]
【従来の技術】例えば、自動車のスペースフレームやラ
ダーフレーム等では、アルミニウムまたはその合金等の
金属からなるサイドフレーム用中空材に、同じく金属製
のクロスメンバー用中空材を直角状に結合することが必
要となる。2. Description of the Related Art For example, in an automobile space frame or ladder frame, a hollow member for a side member, which is also made of a metal such as aluminum or an alloy thereof, can be joined at a right angle to a hollow member for a side frame. Will be needed.
【０００３】このような結合は、次のようにして行われ
ていた。即ち、図２及び図３に示されるように、断面積
の大きな角形のサイドフレーム用中空材（１）の対向側
壁（１１）（１２）に挿通孔（３）（３）を設けるとと
もに、これら対向側壁を貫通した状態にクロスメンバー
用中空材（２）を前記挿通孔（３）に挿通したのち、挿
通孔（３）の周周を溶接し、これにより両中空材（１）
（２）を接合固定していた。Such a connection has been performed as follows. That is, as shown in FIGS. 2 and 3, the through holes (3) and (3) are provided in the opposing side walls (11) and (12) of the rectangular side frame hollow member (1) having a large cross-sectional area, and The hollow member for cross member (2) is inserted into the through hole (3) in a state of penetrating the opposite side walls, and then the periphery of the through hole (3) is welded, whereby both hollow members (1).
(2) was fixed by joining.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな接合方法では、溶接の際に溶接部を含む広範囲な領
域で熱歪が発生し、寸法変化が大きくなるという問題が
あった。特に、中空材がアルミニウムまたはその合金か
らなる場合には、熱影響によって強度低下を生じるもの
であった。However, such a joining method has a problem that thermal distortion occurs in a wide area including a welded portion during welding, resulting in a large dimensional change. In particular, when the hollow material is made of aluminum or its alloy, the strength is lowered due to the influence of heat.
【０００５】この発明は、このような問題を解消するた
めになされたものであって、熱歪や熱影響による強度低
下を生じることのない金属製中空材同士の接合方法の提
供を目的とする。The present invention has been made in order to solve such a problem, and an object thereof is to provide a method for joining metal hollow materials to each other without causing a decrease in strength due to thermal strain or thermal influence. .
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、溶接を用いることなく、拡管による機
械的接合法を採用したものである。In order to achieve the above object, the present invention employs a mechanical joining method by pipe expansion without using welding.
【０００７】即ち、この発明は、一方の金属製中空材
（１）の対向壁（１１）（１２）に挿通孔（３）（３）
を設け、前記対向壁を貫通した状態に他方の金属製中空
材（２）を前記挿通孔（３）（３）に挿通するととも
に、少なくとも各対向壁に対する内外両側部分を含む領
域において、他方の中空材（２）を挿通孔（３）（３）
よりも大きく拡管することにより、挿通孔（３）（３）
に食い込み状態に両中空材（１）（２）を密着せしめる
ことを特徴とする中空材同士の接合方法を要旨とする。That is, according to the present invention, the insertion holes (3) and (3) are formed in the facing walls (11) and (12) of the one hollow metal material (1).
And the other metal hollow member (2) is inserted into the insertion holes (3) and (3) in a state of penetrating the opposing wall, and at least in the region including both inner and outer side portions with respect to each of the opposing walls. Insert the hollow material (2) through holes (3) (3)
Insertion holes (3) (3) by expanding the tube larger than
The gist is a method of joining hollow materials, which is characterized in that both hollow materials (1) and (2) are brought into close contact with each other in a state of being bitten into.
【０００８】この方法によれば、溶接は不要であるか
ら、熱歪や熱影響による強度低下が発生することはな
い。According to this method, since welding is unnecessary, there is no reduction in strength due to thermal strain or thermal influence.
【０００９】[0009]
【発明の実施の形態】次に、この発明の実施の形態を、
自動車フレームにおけるサイドフレーム用中空材と、同
じくクロスメンバー用中空材とを直角状に接合する場合
を例にとって説明する。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described.
An example will be described in which a hollow member for a side frame in an automobile frame and a hollow member for a cross member are joined at a right angle.
【００１０】図２及び図３において、（１）は断面長方
形状のサイドフレーム用中空材、（２）は断面円形のク
ロスメンバー用中空材であり、いずれもアルミニウムま
たはその合金製である。2 and 3, (1) is a hollow member for a side frame having a rectangular cross section, and (2) is a hollow member for a cross member having a circular cross section, both of which are made of aluminum or an alloy thereof.
【００１１】両部材の接合に際しては、まず図２に示さ
れるように、サイドフレーム用中空材（１）の左右対向
側壁（１１）（１２）の接合予定位置に、クロスメンバ
ー用中空材（２）の外径よりも僅かに大きな孔径の挿通
孔（３）（３）をそれぞれ設ける。In joining the two members, as shown in FIG. 2, first, as shown in FIG. 2, the cross member hollow member (2) is placed at a predetermined joining position of the left and right side walls (11) (12) of the side frame hollow member (1). ), The through holes (3) and (3) each having a diameter slightly larger than the outer diameter of (3) are provided.
【００１２】次に、図３に示されるように、クロスメン
バー用中空材（２）を、その先端部がサイドフレーム用
中空材（１）を超えて突出するまで、前記挿通孔（３）
（３）に挿通せしめる。Next, as shown in FIG. 3, the hollow member (2) for the cross member is inserted into the through hole (3) until the tip of the hollow member (2) projects beyond the hollow member (1) for the side frame.
Insert into (3).
【００１３】次に、クロスメンバー用中空材（２）を拡
管する。拡管は、サイドフレーム用中空材（１）の少な
くとも各対向壁（１１）（１２）に対する内外両側部分
を含む領域で行う。この実施形態では、図１のように、
サイドフレーム用中空材（１）の対向壁（１１）（１
２）の外側部分、及びサイドフレーム用中空材（１）へ
の挿入部分を含む長さＬの領域において、クロスメンバ
ー用中空材（２）を拡管している。かつ、拡管は、挿通
孔（３）の周縁にクロスメンバー用中空材（２）が食い
込んで強く密着するように、クロスメンバー用中空材
（２）を挿通孔（３）（３）の孔径よりも径大に拡管し
なければならない。拡管の方法は限定されることはな
く、図４のように、クロスメンバー用中空材（２）の内
部に電磁コイル（４）を挿入し、コイルに電流を流すこ
とにより生じる径大方向の電磁力を利用する電磁成形法
でも良いし、機械的プレス法によっても良いし、液圧を
利用しても良いが、作業が簡単でかつ広範囲な領域を同
時拡管可能なことから、電磁成形法によるのが好まし
い。Next, the hollow member (2) for cross member is expanded. The pipe expansion is performed in a region including at least both inner and outer sides of the facing material (11) (12) of the hollow material (1) for a side frame. In this embodiment, as shown in FIG.
Opposing walls (11) (1) of hollow material (1) for side frame
The hollow member for cross member (2) is expanded in the region of the length L including the outer portion of 2) and the portion inserted into the hollow member for side frame (1). In addition, in expanding the pipe, the hollow member for cross member (2) is inserted from the hole diameters of the through holes (3) and (3) so that the hollow member for cross member (2) bites into the periphery of the through hole (3) and strongly adheres thereto. Must also be expanded to a large diameter. The method of expanding the pipe is not limited, and as shown in FIG. 4, the electromagnetic coil (4) is inserted into the hollow member (2) for the cross member, and a large-diameter electromagnetic field is generated by passing a current through the coil. The electromagnetic forming method that uses force, the mechanical pressing method, or the liquid pressure may be used. However, the electromagnetic forming method is used because the work is easy and a wide area can be expanded simultaneously. Is preferred.
【００１４】クロスメンバー用中空材（２）の拡管後
は、図１に示されるように、クロスメンバー用中空材
（２）がサイドフレーム用中空材（１）の挿通孔（３）
（３）の周縁に食い込み状態に強く密着するとともに、
サイドフレーム用中空材（１）の両側壁（１１）（１
２）はクロスメンバー用中空材（２）の外側拡管部
（５）および内側拡管部（６）によって挟着された状態
となり、クロスメンバー用中空材（２）の軸方向への移
動が阻止される。こうして、サイドフレーム用中空材
（１）とクロスメンバー用中空材（２）とが強固に接合
される。After pipe expansion of the hollow member for cross member (2), as shown in FIG. 1, the hollow member for cross member (2) is inserted through the through hole (3) of the hollow member for side frame (1).
While closely sticking to the peripheral edge of (3) when it bites,
Both side walls (11) (1) of the hollow material (1) for the side frame
2) is in a state of being sandwiched by the outer pipe expanding portion (5) and the inner pipe expanding portion (6) of the hollow member for cross member (2), and the movement of the hollow member for cross member (2) in the axial direction is prevented. It In this way, the hollow member for side frame (1) and the hollow member for cross member (2) are firmly joined.
【００１５】なお、以上の実施例では、断面角形のサイ
ドフレーム用中空材（１）と、断面円形のクロスメンバ
ー用中空材（２）を用いた場合を示したが、中空材の形
状は限定されることはなく、断面角形の中空材同士ある
いは断面円形の中空材同士の接合に本発明を適用しても
良い。In the above embodiments, the hollow member for side frame (1) having a square cross section and the hollow member for cross member (2) having a circular cross section are used, but the shape of the hollow member is limited. However, the present invention may be applied to joining hollow materials having a rectangular cross section or hollow materials having a circular cross section.
【００１６】[0016]
【実施例】サイドフレーム用中空材（１）及びクロスメ
ンバー用中空材（２）として、Ａ６０６３−Ｔ５アルミ
ニウム合金材を用意した。サイドフレーム用中空材
（１）は、縦１５０ｍｍ×横１００ｍｍ×肉厚５ｍｍの
断面角形のパイプを用いた。一方、クロスメンバー用中
空材（２）は、外径８０ｍｍ×肉厚３ｍｍの断面円形の
パイプを用いた。Example A6063-T5 aluminum alloy material was prepared as the side frame hollow material (1) and the cross member hollow material (2). As the hollow material (1) for the side frame, a pipe having a rectangular cross section of 150 mm length × 100 mm width × 5 mm wall thickness was used. On the other hand, as the hollow member for cross member (2), a pipe having a circular cross section with an outer diameter of 80 mm and a wall thickness of 3 mm was used.
【００１７】そして、サイドフレーム用中空材（１）の
左右対向側壁（１１）（１２）に、直径８１ｍｍの円形
挿通孔（３）（３）を設けるとともに、クロスメンバー
用中空材（２）をその先端部がサイドフレーム用中空材
（２）を超えて２０ｍｍ突出するまで、前記挿通孔
（３）（３）に挿通せしめた。Then, circular insertion holes (3) and (3) having a diameter of 81 mm are provided in the left and right side walls (11) and (12) of the side frame hollow member (1), and the cross member hollow member (2) is provided. The tip was inserted into the through holes (3) and (3) until the tip of the tip protruded 20 mm beyond the hollow member for side frame (2).
【００１８】次いで、クロスメンバー用中空材（２）の
管端内部に、電磁コイル（４）を挿入配置したのち、該
コイルに通電して径大方向への電磁力をクロスメンバー
用中空材（２）に付与して、拡管成形を行った。拡管成
形は、クロスメンバー用中空材（２）の管端から長さＬ
＝１４０ｍｍの部分に対して、外径９０ｍｍ（半径方向
の張出量は５ｍｍ）となるように行った。Next, after the electromagnetic coil (4) is inserted and arranged inside the tube end of the hollow member for cross member (2), the coil is energized to generate an electromagnetic force in the radial direction in the hollow member for cross member ( Then, it was subjected to tube expansion molding. For pipe expansion, the length L from the pipe end of the hollow member for cross member (2)
= 140 mm, the outer diameter was 90 mm (the amount of protrusion in the radial direction was 5 mm).
【００１９】こうして得られた接合部材について、接合
強度を調べるため、クロスメンバー用中空材（２）に引
抜力を付与したところ、接合部の破壊に至る引抜力は１
００００ｋｇであった。With respect to the joining member thus obtained, in order to examine the joining strength, a pulling force was applied to the hollow member for cross member (2).
It was 0000 kg.
【００２０】一方、拡管を施すことなく、挿通孔（３）
（３）の周囲においてＭＩＧ溶接を施すことにより、サ
イドフレーム用中空材（１）とクロスメンバー用中空材
（２）を接合した以外は、上記と同様にして接合部材を
製作した。そして、上記と同様にクロスメンバー用中空
材（２）に引抜力を付与したところ、熱影響による強度
低下のため、５０００ｋｇの引抜力で接合部の破壊に至
るものであった。On the other hand, the insertion hole (3) without expanding the tube.
A joining member was produced in the same manner as described above except that the hollow member for side frame (1) and the hollow member for cross member (2) were joined by performing MIG welding around (3). Then, when a pulling force was applied to the hollow member for cross member (2) in the same manner as described above, the strength of the hollow member decreased due to the effect of heat, and the pulling force of 5000 kg resulted in the destruction of the joint portion.
【００２１】[0021]
【発明の効果】この発明は、上述の次第で、一方の金属
製中空材の対向壁に挿通孔を設け、前記対向壁を貫通し
た状態に他方の金属製中空材を前記挿通孔に挿通すると
ともに、少なくとも各対向壁の内外両側部分を含む領域
において他方の中空材を挿通孔よりも大きく拡管するこ
とにより、挿通孔において両中空材を密着せしめること
を特徴とするものであるから、溶接により接合する場合
のような熱歪や熱影響による強度低下の発生を排除する
ことができ、寸法変化の小さくかつ強度的にも優れた接
合部材の提供が可能となる。As described above, according to the present invention, an insertion hole is provided in the opposing wall of one metal hollow member, and the other metal hollow member is inserted into the insertion hole while penetrating the opposing wall. At the same time, since the other hollow member is expanded larger than the insertion hole in a region including at least both inner and outer sides of each opposing wall, the two hollow members are closely adhered to each other in the insertion hole. It is possible to eliminate the occurrence of a decrease in strength due to thermal strain or a thermal effect as in the case of joining, and it is possible to provide a joining member with a small dimensional change and excellent strength.
【図１】この発明によって接合した中空部材の断面図で
ある。FIG. 1 is a sectional view of a hollow member joined according to the present invention.
【図２】一方の中空部材を他方の中空部材の挿通孔に挿
通する前の状態の斜視図である。FIG. 2 is a perspective view showing a state before one hollow member is inserted into an insertion hole of the other hollow member.
【図３】同じく挿通後の斜視図である。FIG. 3 is a perspective view of the same after insertion.
【図４】拡管成形前の中空部材の断面図である。FIG. 4 is a cross-sectional view of a hollow member before pipe expansion molding.
１…サイドフレーム用中空部材（中空部材） １１、１２…対向壁 ２…クロスメンバー用中空部材（中空部材） ３…挿通孔 ４…電磁コイル ５…外側拡管部 ６…内側拡管部 DESCRIPTION OF SYMBOLS 1 ... Hollow member (hollow member) for side frame 11, 12 ... Opposing wall 2 ... Hollow member (hollow member) for cross member 3 ... Insertion hole 4 ... Electromagnetic coil 5 ... Outer pipe expanding part 6 ... Inner pipe expanding part
Claims (1)
１）（１２）に挿通孔（３）（３）を設け、前記対向壁
を貫通した状態に他方の金属製中空材（２）を前記挿通
孔（３）（３）に挿通するとともに、少なくとも各対向
壁に対する内外両側部分を含む領域において、他方の中
空材（２）を挿通孔（３）（３）よりも大きく拡管する
ことにより、挿通孔（３）（３）に食い込み状態に両中
空材（１）（２）を密着せしめることを特徴とする中空
材同士の接合方法。1. A facing wall (1) of one metal hollow member (1)
1) (12) is provided with insertion holes (3) and (3), and the other metal hollow member (2) is inserted into the insertion holes (3) and (3) while penetrating the facing wall, and at least By expanding the other hollow member (2) larger than the insertion holes (3) and (3) in a region including both the inside and outside portions with respect to each opposing wall, both hollows are bited into the insertion holes (3) and (3). A method for joining hollow materials, wherein the materials (1) and (2) are brought into close contact with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7324789A JPH09166111A (en) | 1995-12-13 | 1995-12-13 | Connecting method of metallic hollow members with each other |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7324789A JPH09166111A (en) | 1995-12-13 | 1995-12-13 | Connecting method of metallic hollow members with each other |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006152380A Division JP2006315676A (en) | 2006-05-31 | 2006-05-31 | Joint body for hollow materials made of metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09166111A true JPH09166111A (en) | 1997-06-24 |
Family
ID=18169703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7324789A Pending JPH09166111A (en) | 1995-12-13 | 1995-12-13 | Connecting method of metallic hollow members with each other |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09166111A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006096229A (en) * | 2004-09-30 | 2006-04-13 | Nissan Motor Co Ltd | Bumper structure for vehicle and its forming method |
| JP2006264469A (en) * | 2005-03-23 | 2006-10-05 | Showa Denko Kk | Steering support beam and manufacturing method thereof |
| JP2006264444A (en) * | 2005-03-23 | 2006-10-05 | Showa Denko Kk | Steering support beam and manufacturing method |
| JP2006306248A (en) * | 2005-04-28 | 2006-11-09 | Showa Denko Kk | Steering support beam and manufacturing method thereof |
| JP2007284039A (en) * | 2006-03-22 | 2007-11-01 | Kobe Steel Ltd | Bumper structure and frame structure |
| DE10159212B4 (en) * | 2001-11-28 | 2007-11-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for connecting intersecting hollow profiles and use for carrying out the method |
| JP2008074235A (en) * | 2006-09-21 | 2008-04-03 | Kobe Steel Ltd | Bumper structure |
| US7441335B2 (en) | 2003-09-04 | 2008-10-28 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Methods of electromagnetic forming aluminum alloy wheel for automotive use |
| US7487655B2 (en) | 2002-09-27 | 2009-02-10 | Kobe Steel, Ltd | Process for producing tubular ring with beads and die for use therein |
| US7536765B2 (en) | 2001-03-15 | 2009-05-26 | Vallourec Composants Automobiles Vitry | Method of fastening a cross-member to an arm and a semi-rigid axle made by the method |
| US7658421B2 (en) | 2004-04-27 | 2010-02-09 | Kabushiki Kaisha Kobe Seiko Sho | Axial member with flange, connection member and production methods thereof |
| JP2010163167A (en) * | 2010-04-27 | 2010-07-29 | Kobe Steel Ltd | Mounting structure |
| CN104874664A (en) * | 2015-04-24 | 2015-09-02 | 福州大学 | Alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method |
| CN107030172A (en) * | 2017-05-12 | 2017-08-11 | 华中科技大学 | A kind of electromagnetic casting method and device based on tubing under background magnetic field |
| CN118081310A (en) * | 2024-04-26 | 2024-05-28 | 合肥工业大学 | Titanium-aluminum composite ring piece forming device and method |
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1995
- 1995-12-13 JP JP7324789A patent/JPH09166111A/en active Pending
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|---|---|---|---|---|
| US7536765B2 (en) | 2001-03-15 | 2009-05-26 | Vallourec Composants Automobiles Vitry | Method of fastening a cross-member to an arm and a semi-rigid axle made by the method |
| DE10159212B4 (en) * | 2001-11-28 | 2007-11-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for connecting intersecting hollow profiles and use for carrying out the method |
| US7487655B2 (en) | 2002-09-27 | 2009-02-10 | Kobe Steel, Ltd | Process for producing tubular ring with beads and die for use therein |
| US7441335B2 (en) | 2003-09-04 | 2008-10-28 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Methods of electromagnetic forming aluminum alloy wheel for automotive use |
| US7980615B2 (en) | 2004-04-27 | 2011-07-19 | Kobe Steel, Ltd. | Axial member with flange, connection member and production methods thereof |
| US7658421B2 (en) | 2004-04-27 | 2010-02-09 | Kabushiki Kaisha Kobe Seiko Sho | Axial member with flange, connection member and production methods thereof |
| JP4645131B2 (en) * | 2004-09-30 | 2011-03-09 | 日産自動車株式会社 | Bumper structure for vehicle and method for forming the same |
| JP2006096229A (en) * | 2004-09-30 | 2006-04-13 | Nissan Motor Co Ltd | Bumper structure for vehicle and its forming method |
| JP2006264444A (en) * | 2005-03-23 | 2006-10-05 | Showa Denko Kk | Steering support beam and manufacturing method |
| JP2006264469A (en) * | 2005-03-23 | 2006-10-05 | Showa Denko Kk | Steering support beam and manufacturing method thereof |
| JP2006306248A (en) * | 2005-04-28 | 2006-11-09 | Showa Denko Kk | Steering support beam and manufacturing method thereof |
| JP2007284039A (en) * | 2006-03-22 | 2007-11-01 | Kobe Steel Ltd | Bumper structure and frame structure |
| JP2008074235A (en) * | 2006-09-21 | 2008-04-03 | Kobe Steel Ltd | Bumper structure |
| JP2010163167A (en) * | 2010-04-27 | 2010-07-29 | Kobe Steel Ltd | Mounting structure |
| CN104874664A (en) * | 2015-04-24 | 2015-09-02 | 福州大学 | Alloy pipe fitting electromagnetic bulging and flanging synchronous forming device and method |
| CN107030172A (en) * | 2017-05-12 | 2017-08-11 | 华中科技大学 | A kind of electromagnetic casting method and device based on tubing under background magnetic field |
| CN118081310A (en) * | 2024-04-26 | 2024-05-28 | 合肥工业大学 | Titanium-aluminum composite ring piece forming device and method |
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