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WO1996013679A2 - Ensemble de tube et procede de realisation - Google Patents

Ensemble de tube et procede de realisation Download PDF

Info

Publication number
WO1996013679A2
WO1996013679A2 PCT/US1995/014102 US9514102W WO9613679A2 WO 1996013679 A2 WO1996013679 A2 WO 1996013679A2 US 9514102 W US9514102 W US 9514102W WO 9613679 A2 WO9613679 A2 WO 9613679A2
Authority
WO
WIPO (PCT)
Prior art keywords
tube
fitting
inside diameter
enlarged
bore
Prior art date
Application number
PCT/US1995/014102
Other languages
English (en)
Other versions
WO1996013679A3 (fr
Inventor
John G. Panek
Richard L. Gottorff
Original Assignee
Itt Manufacturing Enterprises, Inc.
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 Itt Manufacturing Enterprises, Inc. filed Critical Itt Manufacturing Enterprises, Inc.
Publication of WO1996013679A2 publication Critical patent/WO1996013679A2/fr
Publication of WO1996013679A3 publication Critical patent/WO1996013679A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints
    • F16L13/14—Non-disconnectable pipe joints, e.g. soldered, adhesive, or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling

Definitions

  • the invention relates to tubing connectors and, more particularly, to such connectors wherein the terminating fitting is impact extruded onto the tubes rather than being brazed, welded or staked onto the associated tube.
  • Tubing connectors for threadless pipe, tubing, conduit and the like are generally known and have been widely used in the art.
  • tubes are mechanically connected by means of a fitting which fits over an expansion on the tube end and are fastened together to clamp the expansion to the mating part.
  • a unitary assembly of tubing with a terminating fastener is provided.
  • the terminating fastener includes a fitting having a tubular opening therein extending through the fitting along the longitudinal axis thereof.
  • a constriction is provided at a location spaced longitudinally from one end of the fitting.
  • a non- expanded end of an expanded tube is received within the largest opening of the fitting. Insertion continues until expansion and fitting interference has been overcome and the expansion is completely seated in the fitting.
  • the internal characteristics of the tube are machined coaxially using a stepped tool.
  • the present invention provides a low cost leak- free tube and fitting assembly.
  • the present invention provides a tube and fitting connection with no potential leak path such as a braze or weld joint, and better dimensional and strength characteristics then a step bead that may distort in the area of the O-ring gland and leak.
  • the present invention can be manufactured using a pollution free, low technology process that is also less costly than brazing, welding or impact extrusion.
  • the leak-free characteristics of the present invention eliminate the loss of fluid and increases the reliability of products that use tube and fitting connections.
  • the present technology uses welding, brazing, end forming or impact extrusion. Welding and brazing have inherent leak potential, end forming is structurally and dimensionally inferior and is prone to distortion, while impact extrusion is expensive and not yet commercially viable.
  • the present invention provides a unitary assembly of tubing with a terminating fastener including a fitting having a tubular opening therein extending along a longitudinal axis and a transition between first and second inner diameters of different dimensions.
  • a tube is also provided having an axial impacted, expanded and sized end for interference fit relative to the opening in the fitting and press fitted in coaxial alignment with the fitting until completely seated.
  • the inside diameter of the tube is finished coaxially with the fitting, so that the tube inside diameter is at least as large as the inside diameter of the tube along substantially its entire longitudinal length.
  • Figure 1 is a sectional view of a tube after a first hit impaction according to the present invention
  • Figure 2 is a sectional view of the tube after a second hit expansion according to the present invention.
  • Figure 3 is a sectional view of the tube after a third hit sizing according to the present invention.
  • Figure 4 is a sectional view of a terminating fastener or fitting according to the present invention.
  • Figure 5 is a sectional view of the terminating fitting pressed onto the end formed on the tubing previously illustrated in Figure 3 according to the present invention
  • Figure 6 is a sectional view of a finished tube and fitting assembly according to the present invention.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT In Figure 1 there is shown a tube 10 after a first hit impaction which maintains the original outside diameter of the tube 10, and coaxially constricts the inside diameter and thickens the wall 12 as required.
  • the original wall thickness of the tube 10 may be approximately .050 inches thick prior to the first hit impaction, and thereafter having a wall thickness of 0.110 to 0.120 inches inclusive.
  • the interference fit can be approximately 0.007 inches interference fit between the expanded outside diameter of the tube and the inside diameter of the fitting 16.
  • the second hit expansion also rough sizes the inside diameter to a machinable condition relative to the dimension of the female pilot land of the finished assembly.
  • FIG. 3 A sectional view of the end 14 of the tube 10 is illustrated in Figure 3 after a third hit sizing which sizes and forms the length of the end 14 relative to the transition of the outside diameters and the non-end formed tube end to provide an exact mating surface to the fitting inside diameter and length capability from the shoulder 18 to the opposite end 14.
  • a sectional end view of a terminating fitting 16 including a transition 20 from the major and minor inside diameters coaxial to each other.
  • the transition 20 is formed as at least one radius.
  • Figure 5 illustrates a sectional end view of the tube 10 and fitting 16 assembly where the expanded end 14 extends beyond the mating surface 22 on the fitting 16 so that both may be machined simultaneously.
  • the interference fit eliminates any chance that a gap between tube 10 and fitting 16 will allow the tube 10 to deform into the transition 20.
  • a sectional end view of the finished tube and fitting assembly is shown in Figure 6.
  • a constricted inner portion 24 of the tube 10 is machined open to the minor inside diameter to match the inner diameter of the tube along substantially its entire length.
  • the portion of the tube 26 inside the fitting bore is swaged into the fitting bore 28.
  • the female pilot land area 30, sealing surface 32 and parting surface 34 are appropriately machined for the desired tolerances.
  • the mating seam 36 between the tube 10 and fitting 16 can also be seen in Figure 6.
  • the terminating fitting 16 may include any external characteristics appropriate to the desired end use.
  • the material of the end fitting 16 and tube 10 may include any desired metallic material such as aluminum, copper, steel or the like.
  • the present invention describes a method and apparatus for providing a unitary assembly of tubing and a terminating fitting facilitating, notably, a pressed on and machined tube to fitting assembly and which overcomes the disadvantages of the prior art. It will be appreciated by those skilled in the art, that the present invention provides consistency and reliability of the completed connection heretofore deemed unattainable at a marketable cost.
  • the form of the invention illustrated and described herein is but a preferred embodiment of the teachings. It is shown as an illustration of the inventive concept, however, rather than by way of limitation, and it is pointed out that various modifications and alterations may be indulged in within the scope of the appended claims.
  • the present invention provides a low cost leak- free tube end fitting assembly.
  • the tube and fitting connection disclosed has no potential leak path such as a braze or weld joint, and provides better dimensional and strength characteristics than a step bead that may distort in the area of the O-ring gland and leak.
  • the unitary assembly can be made using a pollution free, low tech process that is also less costly than brazing, welding or impact extrusion.
  • the leak-free characteristics eliminate the loss of fluid and increases the reliability of tube and fitting connections.
  • the unitary assembly disclosed eliminates the inherent leak potential present in welding and brazing joints, while improving the structural and dimensional characteristics of end forming while reducing distortion and the cost associated with impact extrusion.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention se rapporte à un ensemble unitaire de tube (10) et à un raccord terminal (16), le raccord terminal (16) pouvant être tout raccord approprié à l'application terminale comportant un alésage tubulaire. Une transition inclinée (20) est ménagée de manière coaxiale dans l'alésage (28) à l'intervalle approprié où l'alésage se rétrécit. L'extrémité du tube (10) est coincée coaxialement, dilatée et dimensionnée par rapport à une configuration externe et prend une dimension de façon à former un joint d'ajustement serré par rapport à l'alésage tubulaire (28) traversant le raccord terminal (16). L'extrémité non dilatée du tube (10) est insérée dans l'alésage le plus grand (28) du raccord terminal (16) au-delà de toutes transitions et passe dans l'alésage le plus petit jusqu'à ce qu'il y ait obstacle à cause de la dilatation. On élimine l'obstacle en comprimant la partie dilatée dans l'alésage (28) du raccord terminal (16) jusqu'à ce que la partie dilatée s'adapte totalement dans le raccord terminal (16). L'ensemble tube dilaté et raccord terminal est usiné coaxialement au moyen d'un outil coupant étagé. L'outil coupant étagé usine le diamètre intérieur du tube là où il a été réduit au cours du formage terminal, emboutit le tube dilaté dans l'alésage du raccord terminal, usine la partie plate pilote femelle, la surface d'étanchéité ainsi que la ligne de séparation visible se trouvant entre le tube et le raccord terminal (16).
PCT/US1995/014102 1994-10-24 1995-10-11 Ensemble de tube et procede de realisation WO1996013679A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32762394A 1994-10-24 1994-10-24
US08/327,623 1994-10-24

Publications (2)

Publication Number Publication Date
WO1996013679A2 true WO1996013679A2 (fr) 1996-05-09
WO1996013679A3 WO1996013679A3 (fr) 1996-07-18

Family

ID=23277325

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/014102 WO1996013679A2 (fr) 1994-10-24 1995-10-11 Ensemble de tube et procede de realisation

Country Status (1)

Country Link
WO (1) WO1996013679A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009138A1 (de) * 2000-02-26 2001-09-27 Hummel Anton Verwaltung Rohranschluß mit einem Anschlußteil und mit wenigstens einem Rohr

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887853A (en) * 1987-08-28 1989-12-19 Itt Corporation Method and apparatus for providing a unitary assembly of tubing and a terminating fitting
US5487573A (en) * 1993-11-19 1996-01-30 Itt Corporation Unitary assembly of tubing and a pressed on, interference fit, terminating fitting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009138A1 (de) * 2000-02-26 2001-09-27 Hummel Anton Verwaltung Rohranschluß mit einem Anschlußteil und mit wenigstens einem Rohr
DE10009138C2 (de) * 2000-02-26 2002-11-14 Hummel Anton Verwaltung Rohranschluß mit einem Anschlußteil und mit wenigstens einem Rohr

Also Published As

Publication number Publication date
WO1996013679A3 (fr) 1996-07-18

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