Riveted assembly and associated production method

{
  "publication_number": "US10100859B2",
  "country": "US",
  "kind": "B2",
  "title": "Riveted assembly and associated production method",
  "abstract": "An assembly (110) comprising a core (113) and at least a first sheet (111) held on one side of the core by a rivet (120), the rivet having two ends (121, 122). At least a first one of these ends (121, 122) is flared in shape and extends at least through the entire thickness of the first sheet (111, 112). A method of fabricating such an assembly, in which: a core (113) and a first sheet (111) are provided; the first sheet (111) is placed on one side of the core (113); and the core (113) and the first sheet (111) are riveted together.",
  "claims": [
    "1. An assembly comprising a core, at least one first sheet held on one side of the core by a metallic rivet, and a second sheet held by the rivet on a side of the core opposite from the side of the first sheet, the rivet having two ends and at least a first one of these ends having a flared shape that extends at least through the entire thickness of the first sheet, a second of these ends having a flared shape that extends through at least the entire thickness of the second sheet, wherein the core includes a composite material, and the first sheet and the second sheet each includes a metallic material.",
    "2. An assembly according to claim 1, further comprising a metallic washer that includes a flared shape, and a first end configured to receive the first end of the metallic rivet, wherein the flared shape of the washer extends through the entirety of the first sheet into the core.",
    "3. An assembly according to claim 1, wherein the first end has an outside shape that is conical, with an angle at the apex lying in the range 60° to 130°.",
    "4. An assembly according to claim 1, wherein the outside surface of the first end is level with the outside surface of the first sheet.",
    "5. An assembly according to claim 1, including a bushing placed around an intermediate portion of the rivet, between the ends of the rivet.",
    "6. A rotary or static part, optionally a streamlined part, of a turbine engine, the part comprising an assembly according to claim 1.",
    "7. A fabrication method for fabricating an assembly according to claim 1, the method comprising the following steps: providing a core, a first sheet, and a second sheet; placing the first sheet on one side of the core; placing the second sheet on a side of the core opposite from the side of the first sheet; and riveting together the core, the first sheet, and the second sheet.",
    "8. A fabrication method according to claim 7, wherein, between the placing the first sheet and the riveting step, at least one hole is provided of flared shape that extends at least through the entire thickness of the first sheet.",
    "9. A fabrication method according to claim 7, wherein after the riveting step, the assembly is leveled so that the outside surface of the first end is level with the outside surface of the first sheet.",
    "10. A fabrication method according to claim 7, wherein, in the placing step, the first sheet is fastened to the core, in particular by adhesive.",
    "11. A fabrication method according to claim 7, wherein, in the riveting step, a washer is interposed between the rivet and the second sheet.",
    "12. The method of claim 7, wherein an entirety of the method is performed at a temperature of less than 120° C."
  ],
  "description_excerpt": "The present description relates to a riveted assembly, and more particularly to an assembly comprising a core and at least one first sheet held on one side of the core by a rivet.\n\nPublished patent application FR 2 256 687 describes a riveted assembly comprising a lightweight structure extending between two thin walls. The rivet possesses a frustoconical intermediate portion for coming into contact with the lightweight structure, and two cylindrical ends that are for coming into contact essentially with the thin walls. Each end is provided with an enlarged projecting abutment for holding the assembly made up of the lightweight structure and the two walls sandwiched together. Nevertheless, the enlarged abutments of such a rivet are bulky in size and cannot be made smaller without compromising the mechanical characteristics of the rivet. There therefore exists a need for a novel type of riveted assembly.\n\nTo this end, the present description provides an assembly comprising a core and at least a first sheet that is held on one side of the core by a rivet, the rivet having two ends and at least a first one of these ends having a flared shape that extends through at least the entire thickness of the first sheet. The core may be made up of material that is uniform or of material that is not uniform. The core may be made of one or more layers. The first sheet is of material that is generally thin in one direction in three-dimensional space compared with its dimensions in the other two (orthogonal) directions of three-dimensional space. The direction in which the sheet is thin is referred to as the “thickness” of the sheet.",
  "cpc": [
    "F16B 5/04",
    "F16B 19/08",
    "F16B 19/1027",
    "F16B 5/01"
  ],
  "ipc": [
    "F16B 19/08",
    "F16B 19/10",
    "F16B 5/01",
    "F16B 5/04"
  ],
  "assignees": [
    "SAFRAN AIRCRAFT ENGINES"
  ],
  "inventors": [
    "SAVOYAT PIERRE",
    "BOURGEOIS JEAN-PAUL",
    "DAMBRINE BRUNO",
    "MARLIN FRANÇOIS",
    "RAULIN DOMINIQUE",
    "SERVANT RÉGIS"
  ],
  "filing_date": "2015-04-08",
  "publication_date": "2018-10-16",
  "grant_date": "2018-10-16",
  "priority_date": "2014-04-14",
  "application_number": "US-201515303924-A",
  "family_id": "50841835",
  "citations": [
    "FR2256687A5",
    "GB767547A",
    "US2013055549A1",
    "US2647432A",
    "US3009597A",
    "US3041912A",
    "US3301122A",
    "US3724614A",
    "US3733958A",
    "US3842479A",
    "US4221041A",
    "US4687396A",
    "US5314282A",
    "US5437750A",
    "US5866231A",
    "US8328483B2"
  ]
}