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WO2006071622A1 - Dispositif de maintien d’une pièce d’usinage tubulaire ayant un ensemble de serrage avec un élément d’engagement de pièce d’usinage polarisé - Google Patents

Dispositif de maintien d’une pièce d’usinage tubulaire ayant un ensemble de serrage avec un élément d’engagement de pièce d’usinage polarisé Download PDF

Info

Publication number
WO2006071622A1
WO2006071622A1 PCT/US2005/046068 US2005046068W WO2006071622A1 WO 2006071622 A1 WO2006071622 A1 WO 2006071622A1 US 2005046068 W US2005046068 W US 2005046068W WO 2006071622 A1 WO2006071622 A1 WO 2006071622A1
Authority
WO
WIPO (PCT)
Prior art keywords
work piece
fixture
engaging member
aperture
clamping
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.)
Ceased
Application number
PCT/US2005/046068
Other languages
English (en)
Inventor
Ronald L. Dick
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.)
Swagelok Co
Original Assignee
Swagelok Co
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 Swagelok Co filed Critical Swagelok Co
Publication of WO2006071622A1 publication Critical patent/WO2006071622A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
    • B23K37/02—Carriages for supporting the welding or cutting element
    • B23K37/0276—Carriages for supporting the welding or cutting element for working on or in tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
    • B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • B23K37/0533—External pipe alignment clamps

Definitions

  • the invention is generally directed towards apparatuses and methods that provide for holding work pieces. More specifically, the invention is directed towards apparatuses and methods for holding work pieces to be welded.
  • Fittings are welded to conduits in a variety of applications. Most commonly fittings are welded to conduits in the assembly of flow systems. Fittings typically provide a transition from one conduit to another conduit and perform functions such as: redirecting flow in a flow path; reducing or increasing the size of the cross-sectional area of a flow path; splitting or combining flow paths; and inserting components, such as a valve, into a flow path. Fittings and conduits are often held by a fixture during the welding process. Fixtures often rigidly secure the fitting and the conduit and do not allow for adjustment of the positions of either the fitting or the conduit after the fixtures are tightened.
  • a fitting that is commonly welded to a conduit is a sanitary fitting.
  • Sanitary fittings are normally used in applications where cleanliness is important, such as in food, beverage, water, and dairy systems. For these types of systems, it is often necessary to clean the inside of piping or tubing that is inaccessible from outside the system.
  • One typical method is to flush the piping or tubing with a cleansing solution.
  • a cleansing solution In order to increase the effectiveness of a cleansing solution, it is important that fittings connected to piping or tubing provide smooth internal surfaces at the connections. If an internal surface has edges or hidden surfaces it may be more difficult to clean that surface by flushing.
  • the design and manufacturing of sanitary fittings provide for smooth internal surfaces at the connection of the fitting with piping or tubing, which allow for sanitary surfaces inside of food, beverage, water, dairy, and other such systems.
  • orbital welding produces a higher quality and more consistent weld than does manual welding.
  • customary fixturing for orbital welding can make it difficult to weld sanitary fittings using orbital welding.
  • orbital welding fixturing rigidly clamps onto the outer surface of a fitting. For sanitary fittings with inconsistent outer dimensions, this can lead to a fitting either being loose in a fixture or not being aligned properly when the fixture is tightened.
  • the present application relates to fixturing that allows work pieces to be held and properly aligned.
  • the disclosed fixture may be used to hold and properly align a sanitary fitting and a conduit.
  • Such a fixture may be used to hold a work piece for any manner of operations, including for example, a welding operation.
  • One example embodiment of the invention is a fixture for holding a fitting for orbital welding the fitting to a conduit.
  • the fixture comprises a work piece engaging member positioned for engagement with the fitting and a biasing member that biases the work piece engaging member into engagement with the fitting.
  • the fixture may also comprise a mounting member which assembles to a supporting member of the fixture and holds the work piece engaging member and the biasing member, such that the work piece engaging member extends at least partially radially inward of an aperture in the supporting member that receives the work piece.
  • the position of the work piece in the fixture may be adjusted by moving or positioning the work piece relative to the work piece engaging member.
  • Figure 1 is a perspective view of a fixture for use in an orbital welding process
  • Figure 2 is a perspective view of a clamping assembly
  • Figure 3A is a side view of the clamping assembly
  • Figure 3B is a cross-sectional view of the clamping assembly
  • Figure 3C is a front view of the clamping assembly
  • Figure 4 is a perspective view of a fixture for holding a fitting during an orbital welding process
  • Figure 5A is a front view of a fixture for use in an orbital welding process
  • Figure 5B is a cross-section view of a fixture for use in an orbital welding process.
  • Figure 6 is a side view of a fixture for use in an orbital welding process.
  • the present invention is directed to a fixture for holding and aligning a work piece, for example, for aligning a fitting for welding the fitting to piping, tubing, or other such conduits.
  • the fixture allows for manual manipulation of the fitting position to permit adjustments that may be needed to properly align the fitting to a conduit.
  • a fitting may, for example, have an elbow and a short straight length, or tangent on one end that may make fixturing the fitting in a conventional fixture difficult.
  • other work piece conditions such as irregularity in shape or imprecise outer diameter tolerances, may result in difficulty in clamping and aligning the work piece.
  • an embodiment of the invention includes a work piece engaging member 12 positioned to engage with a work piece 14, such as a fitting, and a biasing member 16 (shown in Figure 3B) to elastically bias the work piece engaging member 12 into engagement with the work piece 14.
  • a work piece 14 such as a fitting
  • a biasing member 16 shown in Figure 3B to elastically bias the work piece engaging member 12 into engagement with the work piece 14.
  • the position of the work piece engaging member 12 is determined by the surface of the work piece 14 against which the work piece engaging member 12 engages.
  • the illustrated work piece engaging member 12 and biasing member 16 are assembled within a housing or mounting member 20 to form a clamping assembly 18.
  • the work piece engaging member 12 is a plunger and the biasing member 16 is a mechanical coil spring.
  • a work piece engaging member 12 may be any component that is capable of transferring force from the biasing member 16 to the work piece 14, such as a cam or lever (not shown), and the biasing member 16 may be any component that is capable of applying a force to the work piece engaging member 12 while allowing axial movement of the work piece engaging member 12 relative to the mounting member 20, such as a series of Belleville spring washers, as shown and described in co-pending United States non-provisional application serial number 10/893,459, entitled “Pipe Collets,” filed on July 16, 2004, the application being incorporated herein by reference in its entirety.
  • the clamping assembly 18 can be coupled to one or more supporting members 22, proximate to the work piece 14, to allow the work piece engaging member 12 to engage the work piece 14.
  • Figure 4 shows a fixture 10 without a work piece 14.
  • the fixture 10 includes two supporting members 22, and four clamping assemblies 18; however, it should be noted that the invention may include a different number of supporting members or clamping assemblies.
  • the supporting members 22 may be semicircular plates with semicircular cut-outs. When the supporting members 22 are placed in communication with one another, the cutouts form an aperture 24 through which a work piece 14 can be accommodated.
  • This exemplary arrangement may further include a holder 8 for holding the supporting members 22 together.
  • the holder 8 may include two halves 8A, 8B held together by a hinge or hinge mechanism 7 and may be releasably connected in an engaged or closed position by a releasable latch or lock fixture 9, as shown in Figure 1.
  • the supporting member 22 may be a single body defining an aperture for receiving the work piece (not shown).
  • the clamping assemblies 18 are coupled to the supporting members 22 such that the work piece engaging members 12 are biased towards the center of the aperture 24 and may extend radially inward of the aperture.
  • the aperture 24 is circular to accommodate a cylindrical work piece.
  • the aperture 24 could take on any geometric shape necessary to accommodate any type of work piece.
  • the aperture 24 could take on a rectangular or oval shape to accommodate a non-cylindrical work piece.
  • the aperture 24 may be defined by supporting member surfaces that are clearance surfaces (i.e., they do not contact the work piece when the work piece is clamped), the precise shape, dimensions, and tolerances of the aperture 24 may not be critical, making the fixture assembly more cost-effective (as precise tolerances are unnecessary) and adaptable to accommodate work pieces of varying dimensions.
  • the work piece 14 is held by the fixture, but the work piece engaging members allow the position of the work piece 14 to be adjusted or moved. This adjustment or movement is possible because when the work piece engaging members 12 are in contact with the work piece 14 the biasing members 16 are not completely compressed.
  • a work piece 14 is manually manipulated to alter the positioning or alignment of the work piece 14 some of the work piece engaging members 12 may be displaced or retracted further into corresponding mounting members 20 and some of the work piece engaging members 12 may be displaced or extended further out of the corresponding mounting members 20.
  • the biasing members 16 are normally in a state of partial compression where a force is exerted on the work piece engaging member 12 and greater compression is possible. Therefore, when a work piece 14 is fixtured, the ability for the work piece engaging members 12 to be displaced either further into the mounting member 20 or further out of the mounting member 20 allows for the movement needed to position and align a work piece 14.
  • the mounting member 20 may include a housing 20' that can be mounted to the support member using mounting holes 25, and fasteners (not shown).
  • the housing 20' may be provided with a generally cylindrical bore 19 in which the biasing member 16 (in this embodiment, a coil spring) and work piece engaging member 12 may be received, allowing the work piece engaging member 12 and biasing member 16 to move axially, while limiting the lateral movement of the work piece engaging member 12 and biasing member 16.
  • the work piece engaging member 12 may be provided with a slight taper from its base to its tip, and the bore 19 may be provided with a corresponding inward taper toward its opening, such that the base of the work piece engaging member 12 has an interference fit with the upper portion of the bore 19.
  • This interference fit may prevent the work piece engaging member from being pushed out of the housing 20' by the biasing member 16 before the work piece 14 has been placed in the fixture 10. It should be noted that it may be desirable to avoid positioning the clamping assembly 18 such that the work piece engaging member 12 is retracted so far into the bore 19 that a gap is created between the work piece engaging member 12 and the side wall of the bore 19, which would allow the work piece engaging member to move laterally in the housing 20', and potentially affect the alignment of the work piece engaging member 12 against the work piece 14.
  • the directions and magnitudes of the forces applied to the work piece 14 by each of the corresponding work piece engaging members 12 may allow for alignment or positioning of the work piece 14 with respect to the fixture without manipulation or adjustment of the fixture itself.
  • the clamping assemblies 18 may be positioned at 90° intervals around the supporting members 22, with the work piece engaging members 12 directed inward of, and normal to, the aperture 24. This arrangement illustrates one possible embodiment in which the gripping forces exerted on the work piece engaging member 12 act in opposite directions to each other, thereby counteracting each other.
  • biasing members 16 which provide relatively consistent output forces across a range of displacement or compression, such that a less compressed biasing member 16, or extended work piece engaging member 12, will provide a gripping force sufficient to counteract an opposing force from a more compressed biasing member 16, or retracted work piece engaging member 12, so as to allow secure alignment in many different positions and orientations of the work piece 14.
  • the clamping assembly 18 of an exemplary embodiment may be adapted to allow for adjustment of a full range of motion of the work piece engaging member 12 and the biasing member 16; that is, permitting adjustment of both a fully extended position of the work piece engaging member 12 and a fully retracted position of the work piece engaging member 12.
  • the housing 20' may be provided with a threaded port 21 and threaded adjusting member 23.
  • the adjusting member 23 may be advanced or retracted to adjust the positions of the work piece engaging member 12 and the biasing member 16.
  • the adjusting member 23 is advanced, the work piece engaging member 12 and the biasing member 16 are pushed further toward the aperture 24 (as shown in Figure 3C), to either engage the work piece 14 (if a gap is present between the work piece 14 and the work piece engaging member 12) or provide increased force on the work piece 14 to grip the work piece 14 more securely or to counteract an opposing force on the work piece 14 by one of the other clamping assemblies 18.
  • the adjusting member 23 When the adjusting member 23 is retracted, the work piece engaging member 12 and the biasing member 16 are drawn further into the mounting member 20 and away from the aperture 24, to accommodate a larger work piece 14, or to reduce the force applied to the work piece 14.
  • the adjusting member 23 provides the bore 19 in which the work piece engaging member 12 and biasing member 16 are received.
  • the bore may be defined by the housing, and a set screw may be installed at a threaded base of the bore to push the work piece engaging member and biasing member toward the aperture or allow the work piece engaging member and biasing member to be drawn away from the aperture (not shown).
  • further adjustability and adaptability of the fixture may be provided by allowing the clamping assemblies 18 to be positionable on the supporting members 22, either radially toward or away from the aperture 24, rotationally around the circumference of the aperture 24, or angularly with respect to the intersecting edge of the aperture 24.
  • the fixture may be adapted to accommodate work pieces of many different shapes, sizes, and tolerances.
  • Such means for attaching and positioning the clamping assemblies on the supporting members may also provide greater adaptability by allowing for replacement of worn clamping assemblies, retrofitting the fixture with clamping assemblies of different sizes, materials, output forces, and contact surfaces, or using the fixture with a different number of clamping assemblies as needed to properly secure and align the work piece.
  • the tip 12' of the work piece engaging member 12 of an exemplary embodiment of the invention is hemispherical in shape, as evident in Figures 2, 3A, and 3B. While any of a wide range of sizes and shapes of work piece engaging members may be used, it is noted that the use of a work piece engaging member 12 having a relatively small contact surface area for engagement with the work piece 14 at a discrete contact point may facilitate easier alignment of the work piece.
  • clamping assembly 18 it should also be noted that it may be desirable to position or adapt the clamping assembly 18 such that the minimum amount of force required to hold the work piece 14 in place is applied by the work piece engaging member 12 to the work piece 14, to minimize marks or indentations in the work piece 14 and the work piece engaging member 12.
  • FIG. 6 illustrates a second work piece, such as a conduit 26, secured by fixturing.
  • the conduit 26 may be cylindrical with a more uniform outer diameter and may therefore be secured by a more conventional fixturing collet 28 (shown in cross-section in Figure 5B).
  • the collet members 28A, 28B forming the collet 28 in this example illustration are semicircular plates with semicircular cutouts.
  • the cutouts form an aperture 29 to accommodate and secure the conduit 26.
  • the collet 28 may be dimensioned to prevent any substantial movement of the conduit 26 with respect to the collet 28 and secure the conduit 26 in a more rigid manner.
  • the collet 28 may be one of any number of clamping or fixturing devices as known in the field, and may be assembled into a collet assembly 13, which may include hinging and latching mechanisms similar to those of the fixture 10.
  • the work piece 14 and the conduit 26 can be placed in communication, as shown in Figures 5B and 6, and can be welded together.
  • the movement allowed by the work piece engaging members 12 and the biasing members 16 allows the position of the work piece 14, with respect to the conduit 26, to be manually manipulated to properly align the work piece 14 with the conduit 26.
  • Proper alignment can entail placing the work piece 14 and conduit 26 into communication, adjusting the work piece 14 so that the end face is flush with the end face of the conduit 26, or rotation of work piece 14 for proper rotational alignment with the conduit 26.
  • the work piece 14 and the conduit 26 can be welded together.
  • the welding process can be orbital welding, for example, accomplished by an orbital weld head 30.
  • a space to accommodate a weld head or other instrument may be provided by assembling a spacer 11 between the fixture 10 and the collet assembly 13.
  • collets 28 that rigidly secure the conduit 26 are replaced by the above described supporting members 22 and clamping assemblies 18 to hold the conduit 26, or any other work piece to which the work piece 14 is to be welded.
  • This embodiment allows adjustment of both the work piece 14 and the conduit 26. This arrangement may allow for larger inconsistencies in the dimensions and characteristics of the conduit 26 to be accounted for in aligning of the conduit 26 to the work piece 14 prior to welding.
  • a contact surface is provided to engage the work piece.
  • the contact surface may be elastically biased against the work piece, thereby allowing the work piece to be moved relative to the contact surface. Additionally, the entire range of motion of the contact surface may be adjusted, to accommodate different sizes of work pieces or different gripping forces on the work piece.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)

Abstract

La présente invention concerne un dispositif (10) de maintien d’une pièce d’usinage comprenant un élément support (22) définissant une ouverture (24) pour recevoir la pièce d’usinage, au moins un ensemble de serrage (18) assemblé avec l’élément support (22), chaque ensemble de serrage (18) comprenant un élément d’engagement de pièce d’usinage (12) pour engagement avec l’élément d’engagement de pièce d’usinage (12) afin de polariser l’élément d’engagement de pièce d’usinage (12) en engagement avec la pièce d’usinage et un élément de montage maintenant l’élément d’engagement de pièce d’usinage (12) et l’élément de polarisation, l’élément de montage étant assemblé à l’élément support (22) de sorte que l’élément d’engagement de pièce d’usinage (12) s’étend au moins partiellement radialement vers l’intérieur de l’ouverture (14). L’invention porte également sur un procédé de maintien d’une pièce d’usinage en alignement pendant une opération de soudure en polarisant de manière élastique au moins un point de contact contre la pièce d’usinage et en déplaçant la pièce d’usinage par rapport audit au moins un point de contact.
PCT/US2005/046068 2004-12-28 2005-12-20 Dispositif de maintien d’une pièce d’usinage tubulaire ayant un ensemble de serrage avec un élément d’engagement de pièce d’usinage polarisé Ceased WO2006071622A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63948004P 2004-12-28 2004-12-28
US60/639,480 2004-12-28

Publications (1)

Publication Number Publication Date
WO2006071622A1 true WO2006071622A1 (fr) 2006-07-06

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PCT/US2005/046068 Ceased WO2006071622A1 (fr) 2004-12-28 2005-12-20 Dispositif de maintien d’une pièce d’usinage tubulaire ayant un ensemble de serrage avec un élément d’engagement de pièce d’usinage polarisé

Country Status (1)

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WO (1) WO2006071622A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130248A1 (it) * 2013-03-26 2014-09-27 Illinois Tool Works Dispositivo per saldatura orbitale a posizionamento rapido
DE102016208527A1 (de) * 2016-05-18 2017-11-23 Mahle International Gmbh Halteeinrichtung zum Halten einer Nockenwelle
CN107511626A (zh) * 2017-07-27 2017-12-26 广东骏驰科技股份有限公司 一种汽车管件焊接定位装置
CN113770944A (zh) * 2021-09-23 2021-12-10 博众精工科技股份有限公司 一种立式辅助装夹装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2253525A1 (de) * 1972-11-02 1974-05-16 Jochen Reinhold Zoz Ringfoermige einspannvorrichtung
US3952936A (en) * 1974-10-07 1976-04-27 Dearman Timothy Charles Reforming pipe clamp
US4314129A (en) * 1979-02-12 1982-02-02 Houston Well Screen Company Method and apparatus for making well screen
US4868367A (en) * 1988-07-08 1989-09-19 Cajon Company Rigid collet assembly for cylindrical workpieces
US5744778A (en) * 1996-04-02 1998-04-28 G&H Diversified Manufacturing, Inc. Tube handling method and apparatus for cutting machine
US6651967B1 (en) * 2001-10-05 2003-11-25 Franklin R. Barber Alignment clamp
US20050011928A1 (en) * 2003-07-17 2005-01-20 Dick Ronald L. Pipe collets

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2253525A1 (de) * 1972-11-02 1974-05-16 Jochen Reinhold Zoz Ringfoermige einspannvorrichtung
US3952936A (en) * 1974-10-07 1976-04-27 Dearman Timothy Charles Reforming pipe clamp
US4314129A (en) * 1979-02-12 1982-02-02 Houston Well Screen Company Method and apparatus for making well screen
US4868367A (en) * 1988-07-08 1989-09-19 Cajon Company Rigid collet assembly for cylindrical workpieces
US5744778A (en) * 1996-04-02 1998-04-28 G&H Diversified Manufacturing, Inc. Tube handling method and apparatus for cutting machine
US6651967B1 (en) * 2001-10-05 2003-11-25 Franklin R. Barber Alignment clamp
US20050011928A1 (en) * 2003-07-17 2005-01-20 Dick Ronald L. Pipe collets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20130248A1 (it) * 2013-03-26 2014-09-27 Illinois Tool Works Dispositivo per saldatura orbitale a posizionamento rapido
WO2014160535A3 (fr) * 2013-03-26 2014-11-20 Illinois Tool Works Inc. Dispositif de soudage orbital à positionnement rapide
US9586294B2 (en) 2013-03-26 2017-03-07 Illinois Tool Works Inc. Quick positioning orbital welding device
DE102016208527A1 (de) * 2016-05-18 2017-11-23 Mahle International Gmbh Halteeinrichtung zum Halten einer Nockenwelle
CN107511626A (zh) * 2017-07-27 2017-12-26 广东骏驰科技股份有限公司 一种汽车管件焊接定位装置
CN113770944A (zh) * 2021-09-23 2021-12-10 博众精工科技股份有限公司 一种立式辅助装夹装置
CN113770944B (zh) * 2021-09-23 2022-12-09 博众精工科技股份有限公司 一种立式辅助装夹装置

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