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EP4121230B1 - Ensemble mandrin d'épaississement de parties de bords dans une surface interne d'un tube - Google Patents

Ensemble mandrin d'épaississement de parties de bords dans une surface interne d'un tube Download PDF

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Publication number
EP4121230B1
EP4121230B1 EP21717528.0A EP21717528A EP4121230B1 EP 4121230 B1 EP4121230 B1 EP 4121230B1 EP 21717528 A EP21717528 A EP 21717528A EP 4121230 B1 EP4121230 B1 EP 4121230B1
Authority
EP
European Patent Office
Prior art keywords
tube
segments
central core
core element
mandrel assembly
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.)
Active
Application number
EP21717528.0A
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German (de)
English (en)
Other versions
EP4121230A1 (fr
Inventor
Pala LAKSHMIKANT
Vishal KALUBHAI BHARODIYA
Gujre VINAY SANJAY
Rahul Kumar Verma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tata Steel Ltd
Original Assignee
Tata Steel Ltd
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 Tata Steel Ltd filed Critical Tata Steel Ltd
Publication of EP4121230A1 publication Critical patent/EP4121230A1/fr
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/025—Dies with parts moving along auxiliary lateral directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles

Definitions

  • the present disclosure relates to the field of metal working technology. Particularly, but not exclusively, the present disclosure relates to forming or thickening portions of a tube. Further embodiments of the present disclosure disclose a mandrel assembly for thickening a brim portion on either ends of the tube from its inner surface keeping the outer surface same.
  • a tube is a hollow elongated member made from materials including, but not limited to, metal, polymers, composites and the like.
  • the tubes in general, may be made by process including but not limited to, rolling, extrusion, pultrusion, protrusion, and the like, where the tube may include a defined thickness based on application.
  • the tube may be used in various fields of domestic, medical, fuel gas distributions, automotive and other applications, including air conditioning and refrigeration.
  • tubes may be used in frames, seating systems, fuel delivery components and automotive link arms require tubes to be welded to create an integrated frame.
  • the tubes may be welded using various known welding methods such as MIG welding, flux-cored arc welding, TIG welding, stick welding and the like, depending on factors including, but not limited to, material of the tube, the size [that is, thickness and diameter] of the tube, profile of the tube joining region, and the like, based on structural configuration required for application of the tube. Further, welding of two or more tubes may result in different zones being formed at a weld juncture, where the different zones include fusion zone, weld interface, heat affected zone, and the like. In general, the fusion zone and the HAZ acts stress affected zones at the joining region of the two or more tubes, where such stress affected zones tend to increase stress concentration in the joining region, impacting structural properties of the two or more tubes. For example, the stress affected zones may reduce durability of the two or more tubes at the joining region for loads including, but not limited to, fatigue load, axial load, shear load, and the like, whereby reducing industrial applicability of the tubes.
  • the tubes including, but not limited to, thickness
  • dimensions of the tubes including, but not limited to, thickness, may be increased, where either overall thickness of the tubes may be increased or thickness at predetermined portions of the tube may be increased to address the stress concentration at the joining regions.
  • the tubes with overall increased thickness may add unnecessary weight to the application, while the tubes with increased thickness at predetermined portions may overcome the limitations of the tubes with overall increased thickness.
  • the tubes may be defined with a thickened portion at the joining regions of the two or more tubes [generally, at brim portion to address impact of the stress concentration].
  • one end of the tubes is defined with a thickened portion [or commonly referred to as increased thickness at a given portion] at a brim portion [or commonly referred to as free ends of the tubes] of the tube such that, the thickened portion of the tube may be joined at a free end of subsequent tube having no thickened portions.
  • a thickened portion or commonly referred to as increased thickness at a given portion
  • a brim portion or commonly referred to as free ends of the tubes
  • the punch-die assembly may address some of the limitations of the conventional methods, operation of the punch-die assembly may be restricted to producing the thickened portion at one end of the tube, as the die may be concealed within the brim portion if both brim portions of the tube are thickened simultaneously.
  • Example of known mandrel assemblies are disclosed in publications US2017/106431 A1 , forming the basis for the preamble of claim 1, CA1280942 C , CN105945201 A , DE 102007034938 A1 or US10514 113 B2 .
  • the present disclosure is directed to overcome one or more limitations stated above.
  • a mandrel assembly according to claim 1 a method for assembling a mandrel assembly according to claim 4 and a method for retracting a mandrel assembly according to claim
  • Embodiments of the present disclosure discloses a mandrel assembly for thickening brim portion in an inner surface of a tube, particularly tubes that may be used in components of an automobile.
  • the mandrel assembly includes a central core element, which is configured to rigidly support a plurality of segments on an outer surface and to accommodate the tube along its length.
  • the plurality of segments are disposable between the central core element and the inner surface of the tube. Further, both ends of each of the plurality of segments are defined with a forming region that is aligned about a specific end, where the brim portion of the tube is deformable along the forming region of the plurality of segments.
  • the mandrel assembly is disassembled/dismantled by displacing the central core element from the plurality of segments. Due to such displacement of the central core element, one segment of the plurality of segments collapses due to gravity, thereby allowing retraction of remaining segments of the plurality of segments. This way, the brim portion of the tube at both ends can be thickened and the mandrel assembly can be effortlessly retrieved from inside of the tube.
  • the terms "comprises”, “comprising”, or any other variations thereof used in the specification are intended to cover a non-exclusive inclusion, such that an assembly that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or method. In other words, one or more elements in an assembly proceeded by "comprises... a" does not, without more constraints, preclude the existence of other elements or additional elements in the assembly.
  • FIGs.1 and 2 are exemplary embodiments of the present disclosure showing sectional view and perspective view of a mandrel assembly 100 for thickening portions of a tube 200.
  • the mandrel assembly 100 may be employable in a press apparatus 300 herein after referred to as "the apparatus” [or generally referred to as punch unit] to enable thickening of sections about a brim portion 202 along an inner surface 201 of the tube 200.
  • the press unit may be including, but may not be limited to, a hydraulic press unit, a pneumatic press unit, a combination of the either of the two, and any other press unit that may be employable for thickening portions of the tube 200.
  • the tube 200 may be of cross-sectional profiles including, but not limited to, triangle, square, rectangle, elliptical, and the like, while for illustration the tube 200 of the present disclosure is illustrated with circular or cylindrical profile.
  • the mandrel assembly 100 includes a central core element 1 and a plurality of segments 2 [or also referred to as die segments 2 of the mandrel assembly 100 for the press unit], where the plurality of segments 2 are disposable around the central core element 1.
  • Each of the central core element 1 and the plurality of segments 2 may include an elongated portion which may be dimensioned to be at least one of equal to, greater than or lesser than longitudinal dimension of the tube 200.
  • the central core element 1 and the plurality of segments 2 may be made from homogenous material or heterogeneous material, where the material may be including, but not limited to, metals, non-metals, polymers, reinforced substances, and the like. Additionally, the central core element 1 and the plurality of segments 2 may be structured to be rigid and may be either solid composition or may be hollow, based on material employed for making the central core element 1 and the plurality of segments 2.
  • an outer section of the central core element 1 and interior portion of each of the plurality of segments 2 may be configured to complement one another at the interface therebetween.
  • the interface between the plurality of segments 2 and the central core element 1 may be defined with tolerance along portions on the circumference or may be seamless, based on required portion for thickening of the tube 200.
  • the plurality of segments 2 are defined with a forming region 3, where the forming region 3 may act as a pressure-acting-surface for the inner surface 201 of the tube 200.
  • the forming region 3 of the plurality of segments 2 may be configured to allow thickening at defined portions of the tube 200.
  • the forming region 3 may be defined at any section along the length of the plurality of segments 2 in order induce thickening at defined portion of the inner surface 201 of the tube 200.
  • the plurality of segments 2 may be assembled to align the forming region 3 at one end such that, the brim portion 202 of the tube 200 on at least one end may be deformable along the forming region 3 to induce thickened portion in the tube 200.
  • the forming region 3 is defined at both ends of the plurality of segments 2.
  • the forming regions may be assembled at one side of each of the plurality of segments 2 or at different sides such that, thickening of the brim portion 202 of the tube 200 may be symmetric or asymmetric respectively, about a predetermined axis of the central core element 1.
  • the forming region 3 may be defined with at least one of depression pattern, bulge portion, a defined pattern [such as, knurled pattern, thread pattern] and/or a combination of each.
  • the forming region 3 is defined with a tapered profile [for example, a depression at ends of the segments 2] on both sides of the plurality of segments 2, in order to thicken the inner surface 201 of the tube 200 at both ends, while one or some of the plurality of segments 2 may be defined with the forming region 3 in order to thicken.
  • the forming region 3 may be defined about a predetermined length of the plurality of segments 2.
  • the plurality of segments 2 may include two or more segments 2, which may be configured to surround the central core element 1 about perimeter region and along length of the central core element 1.
  • the two or more segments 2 of the plurality of segments 2 may be positioned on the central core element 1 about a reference section.
  • a reference line may be indicated on interface surface between the central core element 1 and the plurality of segments 2.
  • the central core element 1 may be defined with at least one of splines, keyways, grooves, and the like on the outer surface, to accommodate and restrain rotational motion of the two or more segments 2 on the central core element 1.
  • the plurality of segments 2 may include four segments 2, namely a first segment [also referred to as one segment 2a] and second segment, third segment and fourth segment [also referred to as remaining segments 2b] as 2a, 2b, respectively, as depicted in FIG.2 .
  • one segment 2a of the plurality of segments 2 may be positioned between the central core element 1 and the inner surface 201 of the tube 200 and, remaining segments 2b of the plurality of segments 2 may be positioned relatively [for example, on either side of the one segment 2a and subsequently adjacent thereto] around the perimeter of the central core element 1. This way each of the plurality of segments 2 may be assembled within the tube 200 and on the central core element 1.
  • FIGs 3A-3D illustrates a schematic diagram of the apparatus 300, where the apparatus includes a first support member 301, a second support member 302 and a punch 303.
  • the first support member 301 may be installed on a rigid platform [for example, the ground] where the apparatus may be mounted and, the second support member 302 may be selectively operable to be positioned proximal and/or distal from the first support member 301.
  • the central core element 1 may be longitudinally suspended [for example, connected or held] from the first support member 301 at one end, while the tube 200 may be inserted and secured [for example, by virtue of gravity and self-weight] about perimeter of the central core element 1 about the other end, as best seen in FIG. 3A .
  • the second support member 302 may be operable by an operation element including, but not limited to, a hydraulic operation element, a pneumatic operation element, an electric operation element, a gear arrangement element, and the like, to displace [that is, vertically move] the second support member 302 for rigidly gripping the tube 200 and centrally [for example, concentrically or symmetrically] aligning the tube 200 about the central core element 1, defining a predetermined gap therebetween.
  • the second support member 302 may be driven by the operational element to provide necessary force for firmly gripping the tube 200 about the central core element 1.
  • degree of alignment of the tube 200 about the central core element 1 may be configured to vary thickening of the brim portion 202 of the tube 200, at its inner surface 201.
  • predetermined gap defined between the tube 200 and the central core element 1 may substantially be equal to thickness of the plurality of segments 2.
  • one segment 2a of the plurality of segments 2 may be disposable between the inner surface 201 of the tube 200 and central core element 1.
  • the one segment 2a of the plurality of segments 2 may be positioned at top section and at the center in the predetermined gap between the tube 200 and the central core element 1.
  • the remaining segments 2b of the plurality of segments 2 may be positioned around the perimeter of the central core element 1, as best seen in FIG. 3C .
  • the tube 200 may be co-axially [also referred to as lateral direction] engaged by the punch 303 from either ends.
  • the punch 303 may be aligned such that, an outer edge of the punch 303 may be in-line [that is, having minimal tolerance therebetween] with an outer surface of the tube 200 in order to mitigate action of shear force at portions of the tube 200.
  • dimension of the punch 303 may be greater than thickness of the tube 200, in order to enhance deformation of the tube 200 at the brim portion 202 and mitigate piercing of the tube 200.
  • the punch 303 may be configured to exert pressure [for example, compressive pressure] about the brim portion 202 [or at lateral surface or perimeter] of the tube 200 to axially deform [or press] the tube 200 about its inner surface 201.
  • the second support member 302 may restrict upward movement [or flow of the material] of the tube 200, whereby restricting deformation to the inner surface 201 of the tube 200 and maintaining external dimensions of the tube 200.
  • the prolonged application of pressure by the punch 303 at the brim portion 202 on the inner surface 201 of the tube 200 may be complemented by an outward force imparted by the plurality of segments 2, as best seen in FIG.3D .
  • the brim portion 202 may be thickened about the inner surface 201 of the tube 200, where the thickening may resemble the profile defined on the outer surface of the plurality of segments 2, as best seen in FIG.2 .
  • thickness at the brim portion 202 of the tube 200 increases after the plastic deformation, as it takes the shape of the plurality of segments 2, as best seen in FIG. 4 . Due to such increase in thickness at the inner surface 201 of the tube 200, the mandrel assembly 100 having the central core element 1 and the plurality of segments 2 within the tube 200 may get rigid, whereby the plurality of segments 2 may not be retrievable from inside of the tube 200.
  • interface between the central core element 1 and the plurality of segments 2 may be defined to be a slideable such that, the central core element 1 may be displaced from such interface.
  • the central core element 1 may be axially displaced [for example, pulled or pushed along the longitudinal axis of the tube 200] by either operating the first support member 301 to extrude the central core element 1 from inside of the tube 200 or by employing a pull mechanism to draw out the central core element 1 from inside of the tube 200.
  • the central core element 1 includes a provision such as, but not limited to, a recess, protuberance, protrusion, and the like, which may enable the central core element 1 to be axially retrieved from the plurality of segments 2 and the tube 200.
  • the central core element 1 which may be surrounded by the plurality of segments 2 and the tube 200, from interior to exterior, respectively, may loosen rigidity of the assembly 100, upon retracting [or displacing].
  • retraction of the central core element 1 may result in collapse of the one segment 2a of the plurality of segments 2 due to gravity [or self-weight].
  • connection between the remaining segments 2b of the plurality of segments 2 within the tube 200 may be fragile and may be individually retrieved from inside of the tube 200, as seen in FIG. 5 .
  • the punch 303 may be simultaneously from either ends of the tube 200 and may be driven by an external actuation source [not shown in figures], where the external actuation source may be driven by mechanisms such as, but not limited to, hydraulic mechanism, pneumatic mechanism, electrical means, and the like. Further, the pressure exerted by the punch 303 may plastically deform the brim portion 202 about internal surface of the tube 200 at its either ends.
  • the assembly 100 can simultaneously thicken the inner surface 201 of the brim portion 202 on both the ends of the tube 200, this ensures lower cycle time which improves the productivity in manufacturing plant. Further, the process has low operation cost over the conventional device due use of less tonnage equipment. Also, the tubes undergo strain hardening during the process, facilitating in increase in strength of the tube 200.
  • Numeral Mandrel assembly 100 Central core element 1 Plurality of segments 2 One segment of the plurality of segments 2a Remaining segments 2b Forming region 3 Tube 200 Inner surface 201 Brim portion 202 Press apparatus 300 First support member 301 Second support member 302 Punch 303

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Extrusion Of Metal (AREA)

Claims (6)

  1. Ensemble mandrin (100) permettant d'épaissir une partie bord (202) d'un tube (200), l'ensemble (100) comprenant :
    un élément noyau central (1) pouvant être reçu par une surface interne (201) du tube (200) ; et
    une pluralité de segments (2), pouvant être disposés entre l'élément noyau central (1) et la surface interne (201) du tube (200),
    caractérisé en ce que la pluralité de segments (2) sont conçus pour entourer l'élément noyau central (1) autour d'une région de périmètre et le long de toute la longueur de l'élément noyau central (1) et que les deux extrémités de chacun de la pluralité de segments (2) sont définies avec une région de formation (3), dans lequel chacun de la pluralité de segments (2) est positionné de manière détachable sur l'élément noyau central (1), dans lequel, lors de l'utilisation, la partie bord (202) du tube (200) est déformable le long de la région de formation (3) dans les deux extrémités de chacun de la pluralité de segments (2).
  2. Ensemble (100) selon la revendication 1, dans lequel la région de formation (3) de chacun de la pluralité de segments (2) est définie avec un profil conique.
  3. Ensemble (100) selon la revendication 1, dans lequel l'élément noyau central (1) est un noyau solide.
  4. Procédé d'assemblage d'un ensemble mandrin (100) selon la revendication 1 à l'intérieur d'un tube (200), ledit ensemble mandrin (100) étant conçu pour épaissir une partie bord (202) dudit tube (200), le procédé comprenant :
    le positionnement de l'élément noyau central (1) autour d'une surface intérieure du tube (200),
    le positionnement de la pluralité de segments (2) entre le noyau central (1) et la surface interne (201) du tube (200), dans lequel la pluralité de segments (2) sont conçus pour entourer l'élément noyau central (1) autour d'une région de périmètre et le long de toute la longueur de l'élément noyau central (1) et les deux extrémités de chacun de la pluralité de segments (2) sont définies avec une région de formation (3) qui s'aligne avec la partie bord (202) du tube (200), dans lequel chacun de la pluralité de segments (2) est positionné de manière détachable sur l'élément noyau central (1).
  5. Procédé selon la revendication 4, comprenant :
    le positionnement de l'élément noyau central (1) en butée contre la surface interne (201) du tube (200), le positionnement d'un segment (2a) de la pluralité de segments (2) entre l'élément noyau central (1) et la surface interne (201) du tube (200), et le positionnement des segments restants (2b) de la pluralité de segments (2) autour du périmètre de l'élément noyau central (1).
  6. Procédé de rétraction d'un ensemble mandrin (100) selon la revendication 1 d'un intérieur de tube (200), ledit ensemble mandrin (100) étant conçu pour épaissir une partie bord (202) dudit tube (200), le procédé comprenant : le déplacement de l'élément noyau central (1) axialement à partir de la pluralité de segments (2) et hors du tube, dans lequel la pluralité de segments (2) sont conçus pour entourer l'élément noyau central (1) autour d'une région de périmètre et le long de toute la longueur de l'élément noyau central (1) ; et dans lequel la rétraction de l'élément noyau central de la pluralité de segments (2) fait s'effondrer l'un parmi la pluralité de segments (2a) sous l'effet de la gravité, et
    la rétractation des segments restants (2) de la pluralité de segments (2) du tube.
EP21717528.0A 2020-03-18 2021-03-18 Ensemble mandrin d'épaississement de parties de bords dans une surface interne d'un tube Active EP4121230B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202031011795 2020-03-18
PCT/IB2021/052276 WO2021186386A1 (fr) 2020-03-18 2021-03-18 Ensemble mandrin d'épaississement de parties bord dans une surface interne d'un tube

Publications (2)

Publication Number Publication Date
EP4121230A1 EP4121230A1 (fr) 2023-01-25
EP4121230B1 true EP4121230B1 (fr) 2024-12-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21717528.0A Active EP4121230B1 (fr) 2020-03-18 2021-03-18 Ensemble mandrin d'épaississement de parties de bords dans une surface interne d'un tube

Country Status (5)

Country Link
EP (1) EP4121230B1 (fr)
JP (1) JP7237181B2 (fr)
BR (1) BR112021018992A2 (fr)
CO (1) CO2021012473A2 (fr)
WO (1) WO2021186386A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112022004444A2 (pt) * 2020-03-27 2022-10-04 Tata Steel Ltd Aparelho para espessamento, processo de espessamento de porções de borda em uma superfície interna de um tubo e tubo

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60127036A (ja) * 1983-12-13 1985-07-06 Kazuhito Fukazawa 両端閉止溝成形工具
GB2206304B (en) * 1987-06-30 1991-07-03 Metal Box Plc Method and apparatus for reducing the mouth of a tubular body.
US5184495A (en) * 1991-12-03 1993-02-09 Prideco, Inc. Method of internally and externally upsetting the end of a metal tube
DE102007034938A1 (de) * 2007-07-24 2009-01-29 Hebö Maschinenfabrik GmbH Verfahren und Vorrichtung zur Herstellung eines rohrförmigen Hohlprofils mit variierender Wanddicke
CN101653813B (zh) 2009-08-31 2010-12-08 江阴德玛斯特钻具有限公司 钻杆管体管端内外加厚模具
JP6269824B2 (ja) * 2014-05-09 2018-01-31 新日鐵住金株式会社 成形金型、及びアンダーカット成形方法
CN107249779B (zh) * 2015-02-18 2019-03-05 新日铁住金株式会社 端部增厚金属管及其制造方法
CN105945201B (zh) * 2016-06-27 2018-03-06 上海交通大学 基于分体组合拆模装置的带内环杯形件的成形模具的拆模方法
KR102174259B1 (ko) * 2018-09-28 2020-11-04 일진제강(주) 업세팅 공법을 이용한 중공 드라이브 샤프트 및 이의 제조 방법

Also Published As

Publication number Publication date
BR112021018992A2 (pt) 2022-10-11
EP4121230A1 (fr) 2023-01-25
JP7237181B2 (ja) 2023-03-10
CO2021012473A2 (es) 2021-10-29
JP2022529305A (ja) 2022-06-21
WO2021186386A1 (fr) 2021-09-23

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