WO2020051814A1 - Procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement - Google Patents

Procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement Download PDF

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Publication number
WO2020051814A1
WO2020051814A1 PCT/CN2018/105368 CN2018105368W WO2020051814A1 WO 2020051814 A1 WO2020051814 A1 WO 2020051814A1 CN 2018105368 W CN2018105368 W CN 2018105368W WO 2020051814 A1 WO2020051814 A1 WO 2020051814A1
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WO
WIPO (PCT)
Prior art keywords
special
pipe
shaped pipe
blank
original
Prior art date
Application number
PCT/CN2018/105368
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English (en)
Chinese (zh)
Inventor
何祝斌
林艳丽
凡晓波
苑世剑
Original Assignee
大连理工大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 大连理工大学 filed Critical 大连理工大学
Priority to PCT/CN2018/105368 priority Critical patent/WO2020051814A1/fr
Priority to AU2018441227A priority patent/AU2018441227A1/en
Publication of WO2020051814A1 publication Critical patent/WO2020051814A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/86—Making other particular articles other parts for bicycles or motorcycles

Definitions

  • the invention belongs to the field of processing and forming special-shaped pipe fittings, and particularly relates to a method for forming special-shaped pipe fittings with connecting edges.
  • the weight reduction of components is mainly achieved by two ways: first, by optimizing the structure, adopting a more reasonable structural form of the bearing capacity and optimizing the wall thickness distribution in the structure, etc., under the premise of ensuring the comprehensive performance of the structure Reduce structural weight as much as possible. Second, use lighter materials with higher specific strength, such as aluminum alloys, magnesium alloys, and titanium alloys. Using such materials can greatly reduce structural weight.
  • the internal high-pressure forming technology that has appeared in recent years has been widely used to achieve the integral forming of longer-length curved axis structures.
  • This technology generally uses a tube blank with a circular cross section as the original blank, and uses bending, preforming, and final forming processes to form an overall complex curved axis tube structure.
  • the U-shaped sub-frame on the chassis of a car is manufactured from a tube blank with a circular cross-section, a numerically controlled bending, flattening pre-forming, and internal high-pressure shaping scheme to replace the previously segmented tailor-welded U-shaped sub-frame.
  • the U-shaped subframe that is integral in the axial direction is not used alone. It also needs to be connected to adjacent chassis structures and engines. Therefore, multiple connection platforms, Connect the holes, and then connect multiple connection plates to the overall subframe, and these connection plates are then connected to other structures.
  • the number of connecting plates is often as many as 20, and the weight is about 10 kg, which weakens the weight reduction effect of the overall sub-frame to a certain extent.
  • a plurality of local structures need to be formed in advance on the overall sub-frame.
  • connection units such as multiple connection plates
  • the present invention is to solve the problems that the existing special-shaped pipe fittings need to additionally add a plurality of complex-shaped connecting plates to achieve fixation and connection with other structures, which results in complex processes, low structural reliability, high manufacturing costs, and the like, and proposes special-shaped pipe fittings with connecting edges. Forming method.
  • the method for forming a special-shaped pipe with a connecting edge is as follows:
  • Step 1 According to the connection requirements of the special-shaped pipe and the adjacent structure, design / select or process the original pipe blank with integrated flange outside;
  • Step 2 Fix the original tube blank with an integrated flange edge on the outside on the pre-forming mold, and use the flange edge to position and restrain the original tube blank;
  • Step 3 The preform mold is closed, and the original tube blank is subjected to a bending or flattening pre-deformation treatment, so that the original tube blank and its flange are deformed to approximate the cross-sectional shape and bending axis of the final part to obtain the preformed tube blank;
  • Step 4 Place the preformed tube blank in the final forming mold, and use the flange edge to position and restrain the preformed tube blank;
  • Step 5 The final forming mold is closed, and the preformed tube is deformed under the external load of the internal pressure and axial thrust, so that the preformed tube is abutted against the mold to form the required bending axis and cross-sectional shape to obtain the final abnormal shape.
  • Pipe fittings
  • Step 6 Take out the final shaped pipe, machine the external integrated flange and the corresponding position of the pipe wall to obtain the required connection holes, and complete the processing of the shaped pipe with integrated connecting edges.
  • the original pipe blank is an extruded profile or a rolled plate profile.
  • the material is aluminum alloy or magnesium alloy.
  • the edge of the slab on the side of the special-shaped pipe and the connecting edge form a closed shaped cross-section by butt or overlap; the overlap method is external overlap and internal overlap.
  • the positioning method is: insert the flange edge on the original tube blank into the groove on the mold, or use a divided mold to clamp the flange edge The way.
  • a support is placed inside the special-shaped tube; when the support is solid, the yield strength of the solid support is 30 to 200 MPa lower than that of the special-shaped tube; When the support is a fluid, the pressure of the fluid support is 10 to 100 MPa.
  • the solid support is a rubber or polyurethane rod.
  • the working temperature of the final forming mold is normal temperature
  • water, oil or an oil-water mixture is filled into the preformed tube blank
  • the working temperature of the final forming mold is 300 to 650 ° C
  • the preformed tube is filled with high-pressure air, nitrogen or argon, and the gas pressure is 5 ⁇ 70MPa.
  • the original blank used has an integrated flange edge, and the deformed section tube and the flange edge are deformed at the same time and always remain as a whole, and are connected to other structures through the connecting edge. It is connected to avoid forming complicated connecting bosses or fixing holes on the shaped pipe body, thereby greatly simplifying the shape complexity of the shaped pipe body and reducing the manufacturing cost;
  • the original blank used has an integrated flange edge, and the special-shaped cross-section pipe and the flange edge are deformed at the same time and are always maintained as a whole.
  • the connecting edge and the special-shaped pipe body The structure is compact and the integrity is good.
  • the external structure is directly connected to the flange. There is no need to set a connecting plate or a local reinforcement structure at the connection of the special-shaped pipe, so the weight of the component is significantly reduced;
  • the original blank used has an integrated flange edge, and the special-shaped section tube and the flange edge are deformed at the same time and always remain as one, eliminating the use of a split structure
  • the weld between the connecting plate and the special-shaped pipe fittings has significantly improved the overall mechanical properties, fatigue resistance and corrosion resistance of the component
  • the method for forming a special-shaped pipe fitting with a connecting edge uses an integrated flange edge on the original blank, and the deformed section tube and the flange edge are simultaneously deformed and maintained as one, avoiding the use of a split structure
  • complex thermal deformation occurs, which affects the precision of special-shaped pipe fittings and the accuracy of assembly with other structures;
  • the method for forming a special-shaped pipe fitting with a connecting edge adopts an original flange with an integrated flange edge, and the deformed section tube and the flange edge are deformed at the same time and are always maintained as one because the shape of the integrated connection edge Relatively simple and generally unobstructed structure around, so different types of connection structures can be easily and flexibly processed on the connection side, which provides the possibility for implementing various forms of local connections;
  • the original blank used has an integrated flange edge, and the deformed section tube and the flange edge are deformed at the same time and are always maintained as a whole.
  • the blank can be produced by either extrusion or rolling.
  • the original blank has low manufacturing cost and does not need to add complicated mold tooling in the subsequent forming of shaped pipes. Therefore, the manufacture of shaped pipes with integrated connecting edges Cost is lower than traditional structure;
  • the original blank used has an integrated flange edge, and the special-shaped tube and the flange edge are deformed at the same time and always remain as one, the special-shaped tube and the flange
  • the edge can be welded to form a closed-section shaped cross-section lumen first, and then subjected to subsequent forming, or it can be not welded to form a closed shaped-section lumen first, and then fixed by spot welding and other methods after forming.
  • FIG. 1 is a schematic diagram of an integrally-shaped shaped cross-section pipe according to the present invention.
  • FIG. 2 is a schematic diagram of connecting the integrally shaped cross-section pipe fitting of the present invention with an adjacent structure using a connecting plate.
  • FIG. 3 is a schematic diagram of a special-shaped pipe with a connecting edge according to the present invention (final part).
  • FIG. 4 is a schematic view of a profiled section pipe and a flange edge manufactured by an extrusion method according to the present invention; wherein (a-1) and (a-2) are a profiled pipe with a circular section and a sectional view thereof, (b-1) And (b-2) are square-shaped shaped tubes and their sectional views, and (c-1) and (c-2) are triangular-shaped shaped tubes and their sectional views.
  • FIG. 5 is a schematic diagram of forming a special-shaped pipe with a connecting edge according to the present invention.
  • the original tube blank is manufactured by an extrusion method, including: bending, pre-forming, and internal pressure bulging; three main processes; (a) is a bending pre- Deformation, (b) is flattening pre-deformation, and (c) is internal pressure bulging.
  • FIG. 6 is a schematic diagram of a special-shaped cross-section pipe and a flange edge manufactured by a sheet bending method according to the present invention (an initial cross-section of a special-shaped cross-section pipe that is closed and welded at an edge).
  • (a) is a circular cross section
  • (b) is a square cross section, the connecting side is on one side
  • (c) is a square cross section, and the connecting side is in the middle.
  • FIG. 7 is a schematic diagram of a special-shaped section pipe and a flange edge manufactured by a sheet bending method according to the present invention (initial welding of a special-shaped section pipe blank, an internal overlap method).
  • (a) is a circular cross section
  • (b) is a square cross section, the connecting side is on one side
  • (c) is a square cross section, and the connecting side is in the middle.
  • FIG. 8 is a schematic diagram of a special-shaped cross-section pipe and a flange edge manufactured by a sheet bending method according to the present invention (initial welding of a special-shaped cross-section pipe blank, external lapping method).
  • (a) is a circular cross section
  • (b) is a square cross section, the connecting side is on one side
  • (c) is a square cross section, and the connecting side is in the middle.
  • FIG. 9 is a schematic diagram of a mold compression seal when a shaped pipe with a connecting edge according to the present invention is formed.
  • (A) is a solid medium without a seal ring
  • (b) is a fluid medium with a seal ring.
  • FIG. 10 is a schematic diagram of a split mold used for forming a shaped pipe with a connecting edge according to the present invention (in the case of preforming and final forming, a split mold is used for a shaped tube and a connecting edge).
  • Embodiment 1 The method for forming a special-shaped pipe with a connecting edge according to the present invention is implemented according to the following steps:
  • Step 1 According to the connection requirements of the special-shaped pipe and the adjacent structure, design / select / process the original pipe blank with the integrated flange outside;
  • Step 2 Fix the original tube blank with the integrated flange edge on the outside of the preforming mold, and use the flange edge to position and restrain the original tube blank;
  • Step 3 Perform pre-deformation such as bending or flattening the original tube blank, so that the original tube blank and its flange are deformed to approximate the cross-sectional shape and bending axis of the final part;
  • Step 4 Place the pre-deformed tube blank with the flange edge in the final forming mold, and use the flange edge to position and constrain the pre-formed tube blank;
  • Step 5 Close the final forming mold to deform the preformed tube blank under the external load such as internal pressure and axial thrust, and form the tube blank against the mold to form the required bending axis and cross-sectional shape;
  • Step 6 Take out the final shaped pipe, machine the external integrated connecting edge and the corresponding position of the pipe wall to obtain the required connection holes, etc., and obtain the finally required shaped pipe with integrated connecting edge.
  • Embodiment 2 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that, in step 1, the original pipe blank used is an extruded profile, and the material is an aluminum alloy or a magnesium alloy. There are no welds between the profiled pipe on the original extruded profile and the flange. Others are the same as the first embodiment.
  • the beneficial effect of this embodiment is that the special-shaped pipe and the flange on the original pipe blank are obtained by one-time forming during the extrusion process, and the special-shaped pipe and the flange will also always remain as one during the subsequent deformation process, and there is no need to form Before the part or after forming the part, the special-shaped pipe and the connecting edge are connected by welding and other methods.
  • Embodiment 3 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that, in step two, a flange edge on the original pipe blank is inserted into a groove on a mold, or a block mold is used.
  • the clamping mode realizes the fixation and positioning of the original tube blank on the forming mold.
  • Others are the same as the first embodiment.
  • the beneficial effect of this embodiment is that since the special-shaped pipe and the flange side on the original pipe blank are integrated, when the flange side is clamped and fixed, the section of the special-shaped pipe can be restricted from being deformed during subsequent bending or flattening deformation. Unreasonable rotation of the axis can ensure that the cross-sectional shape and axis shape of the deformed tube after bending or squashing pre-deformation can be effectively controlled, to prevent uncontrolled deformation of the deformed tube during pre-deformation and affect subsequent internal pressure expansion .
  • Embodiment 4 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that in step 3, before performing pre-deformation such as bending or squeezing, a solid support such as rubber, polyurethane rod, etc. is placed inside the special-shaped pipe. , Or filled with gas, liquid and other fluid support.
  • the yield strength of the solid support is 30 to 200 MPa lower than that of the shaped tube, and the pressure of the fluid support is 10 to 100 MPa.
  • Others are the same as the first and second embodiments.
  • the beneficial effect of this embodiment is that since the special-shaped pipe is a closed structure, it is easy to establish a certain support pressure inside the special-shaped pipe. Under the support of internal pressure, the shaped tube can undergo more complex bending or flattening deformation without local folding and cracking or abnormal indentation in the cross section. This is not a pre-deformation that is not conducive to subsequent bulging, which is the subsequent bulging by internal pressure Obtaining the final profiled fittings guarantees.
  • Embodiment 5 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that, in step 5, the final forming mold used is at a normal temperature state, and water or oil is charged into the preformed tube blank. Or oil-water mixture; or, the final forming mold used is in a heated state of 300 to 650 ° C, and high-pressure air or nitrogen or argon is charged into the preformed tube blank, and the gas pressure is 5 to 70 MPa. Others are the same as the first and second embodiments.
  • the beneficial effect of this embodiment is that according to the difference between the preformed tube blank and the final mold cavity, a reasonable mold temperature is selected for subsequent deformation.
  • the deformation can be performed at normal temperature; when the difference is large or the fillet radius is less than 1.5 times on the mold cavity
  • the mold can be heated to a suitable temperature (for 6061 aluminum alloy, it is heated to 350 ⁇ 550 ° C, and for AZ31 magnesium alloy, it is heated to 280 ⁇ 500 ° C) and then formed. Avoiding the problems of early cracking or insufficient filling of small fillets when forming under unreasonable temperature conditions.
  • Embodiment 6 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that, in step 1, the original blank used is a special-shaped cross-section with a flange edge obtained by bending a plate. The edge of the slab on the side of the special-shaped pipe and the special-shaped pipe or the connecting edge are butted to form a closed special-shaped cross-section. Others are the same as the first embodiment.
  • the beneficial effect of this embodiment is that since the edge of the side of the profiled pipe on the slab directly abuts the slab to form a closed section, there is no excess transition material between the profiled pipe and the flange side, so this form of original blank
  • the lightest weight, its preparation process is similar to the traditional round section tube blank, and the cost is lower.
  • Embodiment 7 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that, in step 1, the original blank used is a special-shaped cross-section with a flange edge obtained by bending a plate. The edge of the slab on the side of the shaped pipe and the shaped pipe or flange are overlapped to form a closed shaped section. Others are the same as the first embodiment.
  • the beneficial effect of this embodiment is that the edge of the slab on the side of the special-shaped pipe forms a closed section with the slab through overlap, and the position of the overlap can be either on the special-shaped pipe or on the edge of the flange;
  • the joints are welded in advance with the profiled tube / flange and then subsequently shaped. It can also be welded after bending or flattening and final internal pressure bulging; it can also be achieved by mold compression during bulging.
  • the overlap method can be used to achieve reasonable connection / restraint of the special-shaped pipe and the flange edge, which provides more possibilities for the reasonable control of material deformation during the pre-forming and final internal pressure bulging process.
  • Embodiment 8 The method for forming a special-shaped pipe with a connecting edge according to the present invention is characterized in that: in step two, before fixing the original pipe blank in a mold, the flange edge on the original pipe blank is processed to Get the required connection hole or connection structure. Others are the same as the first embodiment.
  • connection hole or the connection structure is directly processed on the flange edge of the original tube blank. Since the flange edge is a flat form, it is easy to clamp when machining and the machining equipment used is simple. When the final profiled pipe with integrated connection edges is relatively simple, no severe cross-sectional changes and axis distortions will occur during the pre-forming and final internal pressure bulging process. Using this solution can greatly improve efficiency and reduce costs.
  • Embodiment 9 The method for forming a special-shaped pipe fitting with a connecting edge according to the present invention is characterized in that: in step 2 and step 4, the pre-forming mold and the final forming mold adopt a split structure, and the independent tube is used for the original tube blank. Or, the flange edge on the preform is used for positioning and restraint, and an independent module is used as a forming die for the shaped pipe. Others are the same as the first embodiment.
  • the beneficial effect of this embodiment is that, since the flange side is positioned and restrained by using an independent module, the positioning / constraint / deformation of the flange side will be independent of and subsequent to the mold clamping, loading, and deformation processes of the special-shaped pipe. .
  • the two independent modules of this embodiment can more accurately realize the deformation of the flange edge and the special-shaped pipe. At the same time, mold design and processing and equipment control requirements are greatly reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention porte sur un procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement, lequel procédé concerne le domaine de la mise en forme de raccord de tuyau spécial. Tout d'abord, une ébauche de tuyau originale (4) ayant un bord de bride intégré (4-2) est fixée sur un moule (5, 6), l'ébauche de tuyau originale (4) s'adaptant à l'exigence de raccordement à une structure adjacente, et une pré-déformation, à savoir une courbure ou un aplatissement, est effectuée sur l'ébauche de tuyau originale, de façon à déformer l'ébauche de tuyau originale et le bord de bride de celle-ci, de sorte que la forme de section transversale et l'axe de courbure de l'ébauche de tuyau sont proches de ceux d'une pièce finale, de façon à obtenir une ébauche de tuyau préformée (5-3, 6-3) ; après quoi l'ébauche de tuyau préformée est disposée dans un moule de mise en forme finale, l'ébauche de tuyau préformée étant déformée sous l'effet d'une pression interne et d'une charge externe, à savoir une poussée axiale, de sorte que l'ébauche de tuyau préformée est attachée au moule et mise en forme de façon à avoir un axe de courbure et une forme de section transversale requis pour obtenir le raccord de tuyau spécial final ; les positions correspondantes de la bride intégrée externe et d'une paroi de tuyau sont usinées pour obtenir un trou de raccordement requis pour achever l'usinage. Le présent procédé a un processus simple, une fiabilité structurale élevée et de faibles coûts de fabrication, et est un nouveau procédé de mise en forme de raccord de tuyau spécial.
PCT/CN2018/105368 2018-09-13 2018-09-13 Procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement WO2020051814A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2018/105368 WO2020051814A1 (fr) 2018-09-13 2018-09-13 Procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement
AU2018441227A AU2018441227A1 (en) 2018-09-13 2018-09-13 Method for shaping special pipe fitting having connection edge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/105368 WO2020051814A1 (fr) 2018-09-13 2018-09-13 Procédé pour mettre en forme un raccord de tuyau spécial ayant un bord de raccordement

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WO2020051814A1 true WO2020051814A1 (fr) 2020-03-19

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Cited By (1)

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CN112893595A (zh) * 2021-01-14 2021-06-04 山东钢铁集团日照有限公司 一种弯曲轴线管件低压成形专用模具

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JPH0732076A (ja) * 1993-07-19 1995-02-03 Mitsubishi Alum Co Ltd 車体構造用筒状部材の製造方法
WO2003000441A1 (fr) * 2001-06-26 2003-01-03 Magna Ihv Gesellschaft Für Procede pour produire une piece structurelle d'un corps d'automobile et piece structurelle
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CN106216481A (zh) * 2016-09-14 2016-12-14 哈尔滨工业大学 一种大截面差异形截面管件胀压复合成形方法
CN207271891U (zh) * 2017-08-14 2018-04-27 上海吉诺士汽车配件有限公司 一种基于内高压成形的汽车铝合金副车架成形装置

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Publication number Priority date Publication date Assignee Title
JPH0732076A (ja) * 1993-07-19 1995-02-03 Mitsubishi Alum Co Ltd 車体構造用筒状部材の製造方法
WO2003000441A1 (fr) * 2001-06-26 2003-01-03 Magna Ihv Gesellschaft Für Procede pour produire une piece structurelle d'un corps d'automobile et piece structurelle
JP2006061944A (ja) * 2004-08-26 2006-03-09 Nissan Motor Co Ltd 液圧バルジ方法、液圧バルジ製品および液圧バルジ金型
CN105562516A (zh) * 2016-03-15 2016-05-11 哈尔滨工业大学 一种变截面异形管件充液压制成形方法
CN106216481A (zh) * 2016-09-14 2016-12-14 哈尔滨工业大学 一种大截面差异形截面管件胀压复合成形方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112893595A (zh) * 2021-01-14 2021-06-04 山东钢铁集团日照有限公司 一种弯曲轴线管件低压成形专用模具
CN112893595B (zh) * 2021-01-14 2023-06-16 山东钢铁集团日照有限公司 一种弯曲轴线管件低压成形专用模具

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