EP3520923A1 - Procédure de traitement des tubes soudés - Google Patents

Procédure de traitement des tubes soudés Download PDF

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Publication number
EP3520923A1
EP3520923A1 EP19154917.9A EP19154917A EP3520923A1 EP 3520923 A1 EP3520923 A1 EP 3520923A1 EP 19154917 A EP19154917 A EP 19154917A EP 3520923 A1 EP3520923 A1 EP 3520923A1
Authority
EP
European Patent Office
Prior art keywords
punch
radial
pipe
sectors
die
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.)
Withdrawn
Application number
EP19154917.9A
Other languages
German (de)
English (en)
Inventor
Matteo Boin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3520923A1 publication Critical patent/EP3520923A1/fr
Withdrawn legal-status Critical Current

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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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/026—Enlarging by means of mandrels
    • B21D41/028—Enlarging by means of mandrels expandable mandrels

Definitions

  • the invention relates to a process for machining welded pipes, according to the general part of claim 1, and to a machine that operates according to said process.
  • metal pipes which must have an inner diameter with minimal tolerance, of the order of +0/+0.05 mm.
  • tubular motor This type of automation, commonly known by the name of "tubular motor”, comprises a gear motor that is pushed inside a pipe, where a pipe/gear motor interference occurs, necessary to ensure that the two components are assembled.
  • this machining operation is connected with a process that consists of an expansion calibration action where, through the use of a specific radial expansion spindle, which operates according to determined steps, the regular and controlled widening of the inner diameter of the pipe is achieved, exploiting the properties of the metal to be deformed plastically, when its elastic limit is exceeded.
  • the expansion calibration spindle is connected with a stamping die consisting of a conical punch provided with a die with sectors, on which the pipe to be widened is inserted, so that, with the advance of the conical punch inside the die with sectors, a radial expansion of said die is caused and, consequently, a radial deformation of the pipe inserted thereon, in particular the widening of the inner diameter, all known in itself.
  • the jaws (ref. 10) are rotated by a determined quantity in the circumferential direction through the insertion of a rotating sleeve (ref. 12), whose structure and manner of operating are shown in figs. 2 , 3, 4 .
  • the rotating sleeve (ref. 12) is provided with inner grooves (ref. 13) in which pins ( fig. 14 ), with which the conical punch is provided (ref. 2), slide; in this way, because of the geometry of the aforesaid grooves (ref. 13), the reciprocating and non-rotating axial motion of the aforesaid conical punch (ref. 2) is transformed into a rotational motion of the aforesaid rotating sleeve (ref. 12).
  • the jaws (ref. 20) are rotated by a determined quantity in the circumferential direction through the insertion into the body (ref. 1) of a ring (ref. 4), axially mobile, which holds the jaws (ref. 20) while allowing their axial movement and the securing on the conical punch (ref. 3) of a drum cam (ref. 5) that co-operates with the pins (ref. 4) integral with the aforesaid ring (ref. 4).
  • the drum cam (ref. 5) peripherally has a cam path (ref. 50) alternating longitudinal grooves (ref. 51) of equal depth to diagonal grooves (ref. 52) of variable depth and appropriately shaped, while the pins (ref. 42) are extensible under the action of a spring (ref. 43), so that they remain in contact with the path marked out on the cam (ref. 50); the conformation of the grooves (refs. 51, 52) and the manner of co-operation between the ring (ref. 4) and the cam (ref. 5), to cause the jaws (ref. 20) to be rotated automatically at each expansion, are described in the paragraphs from 0028 to 0031.
  • a punch is used that has, at least in its conical portion, the one that penetrates in the jaws to cause its radial displacement, a polygonal instead of a circular section.
  • a purpose of the present invention is to define a process for machining a device, of the type relating to a process that consists of an expansion calibration action through the use of a specific spindle, which is innovative with respect to known similar processes.
  • This purpose is achieved with a calibrated widening that is characterised in that it uses a punch with polygonal, not circular, section, provided with reciprocating roto-translational motion, instead of only translational reciprocating, where the circumferential rotation of the radial sectors that compose the die on which the pipe to be expanded/calibrated is inserted, after every step of penetration of the punch, is caused directly by the equal rotation of the punch on its surfaces, which define the frustoconical polyhedral surface of said punch, go rest on the inner surfaces of the corresponding radial sector, with no need to insert other auxiliary devices and where the micrometric incremental reciprocating roto-translational movement of the aforesaid punch is obtained by means of two distinct stations, one axial advance/return station and one angular rotation station, arranged cooperating at the end of said piston and commanded by a PLC.
  • the process of the invention uses a radial expansion spindle, indicated in its entirety with the reference 1, comprising a punch 2, which penetrates and support a radial sector die 3, on which is inserted the pipe "T" to be widened.
  • the punch 2 has conical configuration with polygonal section, with a number of sides 4 equal to the number of the radial sectors 5, that constitute the die and that are mutually held and kept resting on the corresponding sides 4, by means of the elastic rings 6.
  • the radial sector die 3, inserted on the punch 2 is fully closed, with the radial sectors 5 mutually mating, so as to form a cylindrical body on which is inserted the pipe "T” that has a diameter "d” smaller than the diameter "D” that has to be obtained at the end of the machining.
  • the punch 2 rotates by an angular portion " ⁇ " and, consequently, it sets in rotation by an equal angular portion also the entire die 3 coupled thereto.
  • said sectors 5, extended radially go rest on the inner wall of the pipe "T" on portions different from those whereon the aforesaid sectors 5 rested during the previous widening step, in order to cancel out the eccentricity caused by the radial notches present between the sectors 5, when they are extended, so as to obtain a perfect circularity of the section of the pipe "T".
  • the die 3, comprising the radial sectors 5, is obtained from an element ( fig. 17 ) consisting of a tang 30, with a diameter "D 1 " equal to the diameter "D” of the pipe "T” at the end of the machining, which is divided in radial sectors 5 by radial notches 31 that have a width "I" ( fig. 18 ) such that, when the aforesaid sectors 5 are mutually approached, the tang 30 assumes a diameter "d1" equal to the diameter "d” of the pipe "T” at the start of the machining ( fig. 19 ).
  • the machine that operates with the aforesaid process comprises a structure 101, which supports the advance/return station, indicated in its entirety with the reference 10, an angular rotation station, indicated in its entirety with the reference 20, a support station of the spindle 1, indicated with the reference 30, and a device for locking the pipe "T", indicated with the reference 40.
  • the advance/return station 10 consists of a gear motor 11, such as a brushless motor provided with encoder, which sets in rotation a shaft 12, which engages in a ball screw 13, that generates the longitudinal sliding of a motorised axle 14 and, consequently, also the longitudinal sliding (arrow F 1 ) of the advance/return station 20 connected thereto and where, through a PLC, the position of the aforesaid motorised axle 14 is constantly modified, based on the value obtained by adding to the value of the diameter of the pipe that was just machined, measured, for example by means of a bore gauge, the nominal value " ⁇ ", so as to maintain the value of the measurement of the inner diameter of the pipe within the predefined tolerance values.
  • a gear motor 11 such as a brushless motor provided with encoder
  • the angular rotation station 20 of the punch 2 comprises a transmission set 21, such as an axial pneumatic cylinder 22 that meshes, through a rack 23, with a pinion 24, splined on the tang 25 of the punch 2 so as to impart on the aforesaid punch 2 a micrometric angular rotation (arrow F 2 ) where the value of the transmission ratio is defined by the PLC according to the value of the amplitude of the angular rotation to be imparted to the radial sectors 5 of the die 3.
  • a transmission set 21 such as an axial pneumatic cylinder 22 that meshes, through a rack 23, with a pinion 24, splined on the tang 25 of the punch 2 so as to impart on the aforesaid punch 2 a micrometric angular rotation (arrow F 2 ) where the value of the transmission ratio is defined by the PLC according to the value of the amplitude of the angular rotation to be imparted to the radial sectors 5 of the die 3.
  • a mechanism 50 which constrains and regulates the radial expansion motion of the radial sectors 5 so as to assure a controlled deformation of the pipe "T" for the entire axis of expansion of the tongs, in which each radial sector 5 is provided with a key 51, engaged to slide in a corresponding radial slot 52, obtained on a disk 53 inserted in the aforesaid block.
EP19154917.9A 2018-02-01 2019-01-31 Procédure de traitement des tubes soudés Withdrawn EP3520923A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT201800002291A IT201800002291A1 (it) 2018-02-01 2018-02-01 Procedimento per la lavorazione di tubi saldati

Publications (1)

Publication Number Publication Date
EP3520923A1 true EP3520923A1 (fr) 2019-08-07

Family

ID=62218071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19154917.9A Withdrawn EP3520923A1 (fr) 2018-02-01 2019-01-31 Procédure de traitement des tubes soudés

Country Status (2)

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EP (1) EP3520923A1 (fr)
IT (1) IT201800002291A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110681750A (zh) * 2019-10-12 2020-01-14 沙文曼(无锡)智能装备有限公司 管端成型机的旋转外撑结构
CN113894212A (zh) * 2021-09-28 2022-01-07 成都同泰汽车零部件有限公司 一种汽车消音器管件管端成型定径装置
US11596999B2 (en) 2019-02-20 2023-03-07 Milwaukee Electric Tool Corporation PEX expansion tool
US11633775B2 (en) 2019-02-20 2023-04-25 Milwaukee Electric Tool Corporation PEX expansion tool
US11779990B2 (en) 2021-04-09 2023-10-10 Milwaukee Electric Tool Corporation Expansion tool
US11819902B2 (en) 2020-11-27 2023-11-21 Milwaukee Electric Tool Corporation Expansion tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1524149A (en) 1975-11-24 1978-09-06 Rothenberger Gmbh Co Hand tool for expanding pipe ends
EP1938950A1 (fr) 2006-12-28 2008-07-02 Virax, SAS Dispositif d'outil à expansion pour pince sur machine à réaliser des emboîtures aux extrémités de tuyaux en matière plastique ou composite
EP2167255B1 (fr) 2007-06-25 2013-07-03 Uponor Innovation AB Procédé et outil pour élargir une extrémité de tuyau

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1524149A (en) 1975-11-24 1978-09-06 Rothenberger Gmbh Co Hand tool for expanding pipe ends
EP1938950A1 (fr) 2006-12-28 2008-07-02 Virax, SAS Dispositif d'outil à expansion pour pince sur machine à réaliser des emboîtures aux extrémités de tuyaux en matière plastique ou composite
EP2167255B1 (fr) 2007-06-25 2013-07-03 Uponor Innovation AB Procédé et outil pour élargir une extrémité de tuyau

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11596999B2 (en) 2019-02-20 2023-03-07 Milwaukee Electric Tool Corporation PEX expansion tool
US11633775B2 (en) 2019-02-20 2023-04-25 Milwaukee Electric Tool Corporation PEX expansion tool
CN110681750A (zh) * 2019-10-12 2020-01-14 沙文曼(无锡)智能装备有限公司 管端成型机的旋转外撑结构
US11819902B2 (en) 2020-11-27 2023-11-21 Milwaukee Electric Tool Corporation Expansion tool
US11779990B2 (en) 2021-04-09 2023-10-10 Milwaukee Electric Tool Corporation Expansion tool
CN113894212A (zh) * 2021-09-28 2022-01-07 成都同泰汽车零部件有限公司 一种汽车消音器管件管端成型定径装置

Also Published As

Publication number Publication date
IT201800002291A1 (it) 2019-08-01

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