EP2021635A2 - Wellenentlastende geometrische merkmale von radial in werkstücke expandierbaren strukturelementen - Google Patents

Wellenentlastende geometrische merkmale von radial in werkstücke expandierbaren strukturelementen

Info

Publication number
EP2021635A2
EP2021635A2 EP07776383A EP07776383A EP2021635A2 EP 2021635 A2 EP2021635 A2 EP 2021635A2 EP 07776383 A EP07776383 A EP 07776383A EP 07776383 A EP07776383 A EP 07776383A EP 2021635 A2 EP2021635 A2 EP 2021635A2
Authority
EP
European Patent Office
Prior art keywords
structural member
longitudinally
recess
workpiece
extending passage
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Withdrawn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
EP07776383A
Other languages
English (en)
French (fr)
Inventor
Douglas W. Glenn
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.)
Fatigue Technology Inc
Original Assignee
Fatigue Technology 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 Fatigue Technology Inc filed Critical Fatigue Technology Inc
Publication of EP2021635A2 publication Critical patent/EP2021635A2/de
Withdrawn legal-status Critical Current

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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
    • B23P9/02—Treating or finishing by applying pressure, e.g. knurling
    • B23P9/025—Treating or finishing by applying pressure, e.g. knurling to inner walls of holes by using axially moving tools

Definitions

  • This disclosure generally relates to a structural member, such as a bushing, having geometrical features that may reduce surface upset at the ends of the member when the member is radially expanded into a workpiece.
  • bushings which may be hollow members such as bushings, with or without a radial flange, liners, sleeves, tubes, pipes, etc. are commonly installed into openings of workpieces for a variety of reasons.
  • Bushings for example, may be installed in the workpiece to reinforce and/or structurally support the region around the opening.
  • the radial flange of the bushing may function as a washer to transmit the fastener clamp- up loads into the workpiece and/or structural joint.
  • the FORCEMATE® installation method is especially suitable for components that will undergo repetitive load cycles and/or may be susceptible to accumulating fatigue damage.
  • the FORCEMATE® installation method utilizes an installation tool to pass a tapered mandrel (i.e., expansion mandrel) through a passage in the bushing after the bushing has been placed in the opening of the workpiece.
  • the tapered mandrel radially expands the bushing into the opening to obtain a controlled, but consistently higher, interference fit than would be achievable by other installation methods, such as shrink or press fitting methods.
  • the FORCEMATE® installation method may induce beneficial residual compressive stresses into the structural material surrounding the opening, which may advantageously extend the fatigue and damage tolerance (e.g., crack growth) life of the component, assembly, and/or installation.
  • the FORCEMATE® installation method as well as other cold-working methods, tooling, and the like, such as the BUSHLOC®, FORCETEC®, and FLEXMATE® methods are described in U.S. Patent Nos.
  • the installed bushings must meet specific flushness requirements.
  • One such requirement in the aerospace industry is that the non-flanged end of the bushing must be flush to under flush within a range of 0 to 0.008 inches from the workpiece surface to maximize the bearing area of the bushing in the workpiece.
  • a bushing were to be installed in an over-flush or protruding condition relative to the workpiece surface, such a condition may cause the protruding bushing end to contact and/or damage a mating part.
  • such an over-flush bushing condition may adversely alter the fastener clamp-up load distribution through the assembled members. Such an altered load path is typically undesirable, and may lead to structural joint problems after the airplane is in service.
  • the excess material may be machined off (i.e., ground).
  • the workpiece is a titanium lug or a hardened, surface-treated steel, for example, extreme care must be taken to not damage the workpiece when using a grinding wheel to remove the excess or over-flush portion of the bushing.
  • This type of a machining operation to bring the bushing flush with the workpiece may be done hundreds of times in a single component, such as a wing skin or fuselage skin. In turn, this may add significant time and cost to the overall assembly, as well as increase the risk of damaging the overall assembly, which may be nearly complete.
  • the amount of bushing extrusion may vary significantly based upon a particular application. For example, some assemblies may call for the installation of a bushing that has a thick wall. Radially expanding a thick-walled bushing into a workpiece typically requires a larger mandrel pull or draw force. The large force often results in a greater amount of bushing material being upset and may also result in the formation of a substantially large extrusion or growth from at least one end of the bushing. Additionally, or alternatively, the extrusion or growth may not be uniform across the non-flanged end of the bushing where, for example, the majority of the growth occurs in an area adjacent to the inner surface of the bushing.
  • the overall grip length of one type of thick-walled bushing may vary by as much as ⁇ 0.020 inches from a pre- installed state with no upset material present at one end of the bushing to a post-installed state with upset material present.
  • This type of bushing growth makes it difficult to keep the entire bushing end surface flush or under-flush relative to the workpiece surface during installation of the bushing.
  • the upset material is extruded and/or displaced axially from at least one end of the bushing as the tapered mandrel is passed through the bushing.
  • a wave of material adjacent to the inner-surface region of the bushing is longitudinally pulled or pushed in the direction of the mandrel travel.
  • the radial force of the tapered mandrel causes at least a small amount of material to be pushed axially out and away from the mandrel entry side of the bushing.
  • the upset material may occur on the flange side or the opposite side of the bushing.
  • the amount of upset material on a particular side of the bushing corresponds, at least in part, to the direction of the mandrel travel.
  • At least one embodiment generally relates to a bushing having a unique geometric end feature such as a countersink detail, a counterbore, or a combination of the two features, for the purpose of receiving an amount of material that is extruded in a longitudinal direction during radial expansion of the bushing.
  • the extruded material may be accumulated from a propagating wave of material preceding a radial expansion mandrel.
  • the extruded material may be caused by the radial force of the expansion mandrel near the unrestrained end surface at the entry side of the bushing.
  • the unique geometric end features of the bushing may also include a high portion on the end surface of the bushing to direct the fastener clamp-up loads through the radial flange of the bushing and into the workpiece.
  • a structural member installable in an opening of a workpiece by radial expansion via an expansion mandrel includes a tubular body having a first end, a second end opposite the first end, a peripheral outer surface disposed between the first and the second ends, the tubular body having a first face at the first end, a second face at the second end, and an inner surface that extends between the first and the second ends to form a longitudinally-extending passage therebetween, wherein in a pre-installed state the tubular body has a first recess formed on the first face about the longitudinally-extending passage and adjacent thereto, the first recess having a volume sized to accommodate a first amount of upset material that will be formed by passage of the expansion mandrel through the longitudinally- extending passage to install the structural member in the opening of the workpiece.
  • a structural member installation in another aspect, includes a workpiece having an opening formed therein; and a tubular body having a first end, a second end opposite the first end, a peripheral outer surface disposed between the first and the second ends, the tubular body having a first face at the first end, a second face at the second end, and an inner surface that extends between the first and the second ends to form a longitudinally- extending passage therebetween, wherein in an installed state the peripheral outer surface deformingly engages the workpiece to form an interference fit therewith and a first amount of upset material formed by passage of an expansion mandrel through the longitudinally-extending passage to install the structural member in the opening of the workpiece is accommodated by a first recess adjacent to and surrounding the longitudinally-extending passage such that the first amount of upset material does not extend outwardly from the first face of the tubular body or inwardly from the inner surface into the longitudinally-extending passage.
  • a method of radially expanding a structural member into a workpiece includes positioning an expansion mandrel at an entrance of a longitudinally-extending passage extending through the structural member, the structural member having a first end, a second end opposite the first end, a peripheral outer surface disposed between the first and the second ends, the structural member further having a first face at the first end, a second face at the second end, and an inner surface that extends between the first and the second ends to form the longitudinally-extending passage therebetween; passing the expansion mandrel through the longitudinally-extending passage from the first face to a second face of the structural member to radially expand at least a portion of the structural member into the workpiece; and longitudinally displacing some of the material of the structural member into at least one recess having a volume sized to accommodated a first amount of upset material, wherein the volume of the recess is sufficient to receive the displaced material without permitting any of the displaced material to extend beyond a desired distance relative to the respective face.
  • a method of manufacturing a structural member to be secured into an opening of a workpiece includes forming an outer surface and an inner surface, the outer surface radially offset from the inner surface to form a wall of the structural member; forming first end and a second end opposite the first end; forming a first face at the first end and a second face at the second end, the inner surface extending between the first and the second ends to form a longitudinally-extending passage therebetween; and forming a recess into at least one of either the first face or the second face, wherein the recess defines a volume sized to accommodated a first amount of upset material expected when an expansion mandrel is passed through the longitudinally-extending passage during a radial expansion process to secure the structural member into the opening of the workpiece.
  • Figure 1 is a cross-sectional view of a prior art structural member in an opening of a workpiece, wherein the structural member is about to be radially expanded by an expansion mandrel, according to one illustrated embodiment.
  • Figure 2 is a cross-sectionai view of the prior art structural member of Figure 1 after being radially expanded in the opening of the workpiece, wherein the structural member includes first and second displaced- material portions formed during a radial expansion process, according to one illustrated embodiment.
  • Figure 3 is a detailed cross-sectional view of the first displaced material portion of Figure 2, wherein the first displaced-material portion is located at a mandrel entrance side of the structural member, according to one illustrated embodiment.
  • Figure 4 is a detailed cross-sectional view of the second displaced-material portion of Figure 2, wherein the second displaced-material portion is located at a mandrel exit side of the structural member, according to one illustrated embodiment.
  • Figure 5 is a cross-sectional view of a prior art installation of two workpieces that are adversely influenced by displaced-material portions of a radially-expanded structural member located in one of the workpieces, according to one illustrated embodiment.
  • Figure 6A shows the prior art installation of Figure 5 having a fastener to clamp the two workpieces together, according to one illustrated embodiment.
  • Figure 6B shows another prior art installation having a fastener to clamp the two workpieces together, according to one illustrated embodiment.
  • Figure 7 is a cross-sectional view of a first structural member in a pre-radially expanded state having geometric features capable of accommodating an amount of displaced material expected when the first structural member is radially expanded with a cold-expansion mandrel, according to one illustrated embodiment.
  • Figure 8 is a cross-sectional view of the first structural member of
  • Figure 7 in a post-radially-expanded state showing the displaced material received in the geometric features, according to one illustrated embodiment.
  • Figure 9 is a cross-sectional view of a second structural member in a pre-radially expanded state having geometric features capable of accommodating an amount of displaced material expected when the second structural member is radially expanded with a cold-expansion mandrel, according to one illustrated embodiment.
  • Figure 10 is a cross-sectional view of the second structural member of Figure 9 in a post-radially-expanded state showing the displaced material received in the geometric features, according to one illustrated embodiment.
  • the structural member can be a bushing, sleeve (including a split sleeve), liner, shank, rivet, or other similar component. It is appreciated and understood that the process of installing the component into the opening of the workpiece may or may not result in the creation of a zone of residual compressive stress (e.g., an annular zone of compressive stresses) in the workpiece or workpieces.
  • cold working and/or radial expanding of the workpiece This reference is not intended to limit or otherwise narrow the scope of the disclosure.
  • the process of cold expansion is to be broadly interpreted as any process that radially expands at least some of the material surrounding the opening in the workpiece, even if the expansion is for the purpose of impeding the growth of a fatigue crack. It is further understood that cold expanding the opening of the workpiece may or may not induce beneficial compressive residual stresses and may or may not produce fatigue- enhancing benefits in the workpiece.
  • the following description generally relates to a structural member with geometric features that permit the member to be radially expanded into an opening of a workpiece while reducing, limiting, or substantially eliminating unwanted deformed, upset, or distorted regions of the member that may adversely affect the structural joint and/or create an undesirable installation condition.
  • the structural member may even be the workpiece itself.
  • the process of passing an expansion mandrel through a thick-walled bushing and radially expanding the thick-walled bushing into the workpiece may result in at least some amount of deformation (e.g., upset, displaced, and/or distorted material) near both the mandrel entry and exit sides of the bushing.
  • the radial flange of the bushing may move away or separate from the workpiece, thus creating an undesirable gap between the radial flange of the bushing and the workpiece. Gaps between the bushing and the workpiece can significantly reduce the performance of the installation.
  • Figure 1 shows a pre-radially-expanded installation 100 comprising a workpiece 102 and a conventional, pre-radially-expanded structural member 104.
  • An expansion mandrel 106 is passed through the structural member 104 to radially expand the structural member 104 into the workpiece 102.
  • the mandrel 106 may be pulled in a mandrel direction 108, which in the illustrated embodiment is directed from the flange side 110 to the non-flange side 112 of the structural member 104.
  • Figure 2 shows a radially-expanded installation 200 comprising a workpiece 202 and a radially-expanded structural member 204.
  • a mandrel e.g., the mandrel 106 of Figure 1 passing through the structural member 204 in the mandrel direction 208 radially expands the structural member 204 such that an outer surface 214 of the radially-expanded member forms a tight interference fit with the workpiece 202.
  • the inner perimeter of a passage 218 formed by the inner surface 216 is enlarged by the passage of the mandrel.
  • a wall thickness between the outer and the inner surfaces 214, 216 may be reduced by the passage of the mandrel.
  • the radially-expanded structural member 204 includes a first surface 220 and an opposing second surface 222.
  • the radially-expanded structural member 204 may include a radial flange 224. Other embodiments may omit the radial flange 224.
  • the inner surface 216 may be allowed to displace axially during the expansion process.
  • the lack of axial constraint permits at least some of the material along and adjacent to the inner surface 216 of the structural member 204 to be axially deformed (e.g., permanently upset or distorted).
  • a first upset region 226 is observable at the mandrel entry side 228 of the structural member 204, while a second upset region 230 is observable at the mandrel exit side 232.
  • Figure 3 shows a detailed view of the upset region 226 located along and adjacent to the inner surface 216 and further located at the mandrel entry side 228.
  • the first upset region 226 may be formed because the first surface 220 is a free surface and a Potsson's affect occurs due to the radial- expansion force of the mandrel 106 ( Figure 1) near the entry side 228.
  • the Poisson's affect is generally understood to mean that the lateral or transverse strain normal to the direction of the applied stress in an elastic member is not equal to zero.
  • the applied stress is the radial stress from the mandrel 106 while the transverse strain comprises the first upset region 226.
  • Figure 4 shows a detailed view of the upset region 230 located along and adjacent to the inner surface 216 and further located at the mandrel exit side 232 of the member 204.
  • the upset region 230 at the mandrel exit side 232 will be larger than the upset region 226 at the mandrel entry side 228 because the upset region 230 is typically caused by a wave of material that is drawn or pushed by the mandrel 106. The wave of material propagates ahead of the expansion mandrel 106 during radial expansion.
  • thick-walled bushings are more susceptible to forming a larger, more extended, and/or more protruded second upset region 230 than thin-walled bushings.
  • the mandrel forces during expansion of thick-walled bushings tend to be relatively large to ensure an adequate interference fit between the thick-walled structural member 204 and the workpiece 202.
  • a pocket 234 may be formed by an end surface 235 of the structural member 204.
  • the structural member 204 can be configured with an under-flush grip length before the member is installed into the workpiece 202, which results in the illustrated under-flush end surface 235.
  • Figure 5 shows an installation 300 comprising a first workpiece 302, a structural member 304, and a second workpiece 336, according to one illustrated embodiment.
  • the second workpiece 336 should be in flush contact with the first workpiece 302, but the second upset region 330 causes the second workpiece 336 to be separated from the first workpiece 302 by a gap or space 338.
  • the direction of mandrel travel is indicated by the arrow 339. It is appreciated that the grip length of the structural member 304 could be shortened to keep the upset region 330 from becoming over-flush with respect to the abutting surface 341 of the workpiece 302.
  • Figure 6A shows the installation 300 of Figure 5 further comprising a fastener 340 inserted through the structural member 304, the first workpiece 302, and the second workpiece 336, respectively.
  • a threaded end 341 of the fastener 340 receives a threaded nut 342.
  • a washer 344 may be placed between the nut 342 and the second workpiece 336 to protect the surface of the second workpiece.
  • the first upset region 326 causes the clamp-up forces in the installation 300 to proceed approximately along a load path line 348 (shown in phantom line). It is typically highly advantageous in a structural joint to have the fastener clamp-up forces be distributed along the radial flange 224 ( Figure 2), the first workpiece 302, and the second workpiece 336.
  • the illustrated upset regions 326, 330 generate an undesirable load path during fastener clamp-up.
  • Figure 6B shows a structural joint 400 comprising a fastener 440 inserted through a first structural member 404 and a second structural member 405, which are located in a first workpiece 402 and a second workpiece 436, respectively.
  • a threaded end 441 of the fastener 440 receives a nut 442.
  • a washer 444 may be positioned between the nut 442 and the second workpiece 436.
  • the strain energy from the radial-expansion process can cause a flange 451 to move away from the workpiece 402.
  • the first upset region 426 causes the clamp-up forces in the structure to proceed approximately along a load path line 448, which may generate a substantial amount of shear stress between the radial flange 451 and a body 453 of the first structural member 404, where the shear region is shown by dashed line 449.
  • Figure 7 shows a structural member 500 in a pre-radially- expanded state.
  • the structural member 500 can be configured to reduce, limit, or substantially eliminate unwanted protruding of deformed material formed during installation.
  • the illustrated structural member 500 includes an outer circumferential surface 502 and an inner surface 504 that forms a passage 506 through the structural member 500, according to one illustrated embodiment.
  • the structural member 500 includes a first surface 508 and a second surface 510 opposed to the first surface 508.
  • the first surface 508 is substantially perpendicular to a longitudinal axis 511 of the structural member 500.
  • a radial flange contact surface 509 is substantially perpendicular to the longitudinal axis 511 and the surface 508 may be non-perpendicular to the axis 511.
  • the arrow 513 represents the direction the mandrel 106 ( Figure 1) can travel through the passage 506 of the structural member 500 during radial expansion of the structural member 500.
  • the second surface 510 includes a first region 512 and a second region 514.
  • a portion 512a of the first region 512 which is radially adjacent to and/or includes a portion of the inner surface 504, is longitudinally located from the first surface 508 by a first member length 516.
  • the second region 514 extends radially outward from the first region 512.
  • a portion 514a of the second region 514 which is radially located farthest from the inner surface 504, is longitudinally located from the first surface 508 by a second member length 518.
  • the first member length 516 is less than the second member length 518 such that the first region 512 and the second region 514 form a recess 520.
  • the recess 520 may generally be referred to as, but not limited to, a pocket, countersink, counterbore, chamfer, taper, or the like.
  • the recess 520 is dimensioned to receive at least some material that may be deformed when the structural member 500 is installed (e.g., radially expanded into the opening of a workpiece).
  • the recess 520 can define a volume sized to receive a desired amount of mandrel exit upset material 530 ( Figure 8) expected to form on the expansion mandrel exit side 528 of the structural member 500.
  • a substantial portion of the upset material 530 is received in the recess 520.
  • the recess 520 can become smaller as the amount of upset material 530 is increased.
  • the upset material 530 does not extend beyond a surface 524, as shown in Figure 8.
  • the depth 522, cross-sectional area, and configuration of the recess 520 can be selected based on the amount and location of upset material 530.
  • the surface 524 is the surface located farthest from the first surface 508.
  • the outer diameter of the recess 520 is less than the outer perimeter that corresponds to the outer surface 502.
  • the surface 524 may be an approximately flat surface surrounding the recess 520.
  • the size of the surface 524 can be a function of the wall thickness of the structural member 400, as well as other design parameters, according to one embodiment.
  • Figure 8 shows the structural member 500 in a radially-expanded state after the expansion mandrel 106 has passed through the passage 506 of the structural member 500 to radially expand the structural member 500 into the workpiece 102.
  • the recess 520 accommodates the mandrel exit upset material 530.
  • the mandrel exit upset material 530 is the same material as the material of the structural member 500, but is shown with different cross-hatching for the sake of clarity.
  • the structural member 500 can further include an entry recess
  • the entry recess 526 can receive a selected amount of mandrel entrance upset material 532 ( Figure 8) that forms when the expansion mandrel 106 ( Figure 1) enters the opening 506 and begins to radially expand the structural member 500.
  • Figure 9 shows a structural member 600 in a pre-radially- expanded state.
  • the structural member 600 can include an outer surface 602 and an inner surface 604 that forms a passage 606 through the structural member 600.
  • the structural member 600 includes a radial flange 608, a first surface 610, and a second surface 612.
  • the first surface 610 is substantially perpendicular to a longitudinal axis 611 of the structural member 600.
  • the arrow 613 represents the direction the mandrel 106 ( Figure 1) passes through the passage 606 when the structural member 600 is radially expanded.
  • the second surface 612 includes a first region 614 and a second region 616.
  • a portion 614a of the first region 614 which is radially adjacent to and/or includes a portion of the inner surface 604, is longitudinally located from the first surface 610 by a first member length 618.
  • the second region 616 extends radially outward from the first region 614.
  • a portion 616a of the second region 616 is radially spaced from the inner surface 604 and is radially farther from the longitudinal axis 611 than the outer surface 602.
  • the portion 616a of the second region 616 is longitudinally located from the first surface 610 by a second member length 620.
  • the first member length 618 is less than the second member length 620 such that the first region 614 and the second region 616 form a recess.
  • the recess 622 may generally be referred to as, but not limited to, a countersink, gradual taper, and/or an arcuate surface.
  • the recess 622 is dimensioned to receive a selected amount of a mandrel exit upset material 630 ( Figure 10) that may be deformed as the expansion mandrel 106 exits the structural member 600 during the radial-expansion process.
  • the recess 622 includes a depth 624 which, in combination with the area of at least the first region 614, provides a volume sized to receive the mandrel exit upset material 630 (Figure 10) expected to form on the expansion mandrel exit side of the structural member 600 without permitting the material 630 to extend beyond a portion 634 ( Figure 10) adjacent to a surface 626.
  • the surface 626 is a flat surface located longitudinally farthest from the first surface 610 and is also substantially parallel to the first surface 610.
  • the structural member 600 may include an entry recess 628 proximate a countersink surface or an arcuate surface 529.
  • Figure 10 shows the structural member 600 in a radially- expanded state after the expansion mandrel 106 has passed through the opening 606 of the structural member 600 to radially expand the structural member 600 into the workpiece 102.
  • the recess 622 accommodates the mandrel exit upset material 630.
  • the mandrel exit upset material 630 is the same as the material of the structural member 600, but is shown with different cross-hatching for the sake of clarity.
  • the volume of the recess 622 is sufficient to receive the mandrel exit upset material 630 without permitting the mandrel exit upset material 630 to extend beyond a portion 634 of the structural member 600. In another embodiment, the volume of the recess 622 is sufficient to receive the mandrel exit upset material 630 without permitting the material 630 to extend up to and/or become flush with the portion 634 of the structural member 600.
  • the surface 626 is angled by an angle, ⁇ , towards the first surface 610, such that the portion 634 is located farthest from the first surface 610 relative to the surfaces 612 and 626.
  • a load path 638 (e.g., the load path for the fastener clamp-up loads or other applied loads) goes through the radial flange 608 and directly into the workpiece 102.
  • the portion 634 can be located radially outwardly from a cutout 640 so that the load path 638 does not travel through the thinnest or narrowed portion of the radial flange 608. Accordingly and as illustrated, the portion 634 is located radially outward on the flange 608 to allow the fastener clamp-up loads to be reacted through the radial flange 608, which may operate as a washer to spread the load into the workpiece 102. If the mandrel exit upset material 630 were permitted to extend beyond the portion 634, the fastener clamp-up loads would react through the bushing wall 642 and generate a non- desirable shear load 644 through the radial flange 608. Further, another countersink surface 628 may accommodate the mandrel entrance upset material 632.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Insertion Pins And Rivets (AREA)
EP07776383A 2006-04-27 2007-04-27 Wellenentlastende geometrische merkmale von radial in werkstücke expandierbaren strukturelementen Withdrawn EP2021635A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US79588806P 2006-04-27 2006-04-27
PCT/US2007/010291 WO2007127399A2 (en) 2006-04-27 2007-04-27 Wave relieving geometric features in structural members that are radially expandable into workpieces

Publications (1)

Publication Number Publication Date
EP2021635A2 true EP2021635A2 (de) 2009-02-11

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Family Applications (1)

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EP07776383A Withdrawn EP2021635A2 (de) 2006-04-27 2007-04-27 Wellenentlastende geometrische merkmale von radial in werkstücke expandierbaren strukturelementen

Country Status (4)

Country Link
US (1) US20070289351A1 (de)
EP (1) EP2021635A2 (de)
JP (1) JP5204096B2 (de)
WO (1) WO2007127399A2 (de)

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JP2009535577A (ja) 2009-10-01

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