Method for adhering parts and device for implementing said method

{
  "publication_number": "US10137640B2",
  "country": "US",
  "kind": "B2",
  "title": "Method for adhering parts and device for implementing said method",
  "abstract": "A method is provided of bonding together at least two parts. The method includes assembling together at least two parts and at least one adhesive layer, the adhesive being configured so that its adhesive power increases on heating as a result of it polymerizing, at least one of the parts being made of composite material or of metal, the adhesive layer being present, after assembly, between the parts, the assembled together parts and the adhesive being present in a chamber defined by a wall, the wall having an inside face situated facing a first part present between the adhesive layer and the wall, the first part being intended to be bonded to a second part and only a fraction of the second part being present inside the chamber; and applying a liquid against the wall on its side opposite from the chamber.",
  "claims": [
    "1. A method of bonding together at least two parts, the method comprising: assembling together at least two parts and at least one adhesive layer, the adhesive being configured so that its adhesive power increases on heating as a result of it polymerizing, at least one of the parts being made of composite material or of metal, the adhesive layer being present, after assembly, between the parts, the assembled together parts and the adhesive being present in a chamber defined by a wall, the wall having an inside face situated facing a first part present between the adhesive layer and the wall, the first part being intended to be bonded to a second part and only a fraction of the second part being present inside the chamber; applying a hydrostatic pressure on the parts by contacting a stationary liquid with a side of the wall opposite from the chamber, the wall being configured so that, at least after application of the hydrostatic pressure, its inside face has the same shape as the first part; and bonding the parts with the hydrostatic pressure applied thereto.",
    "2. The method according to claim 1, wherein the inside face of the wall conserves its shape during application of the liquid.",
    "3. The method according to claim 1, wherein the shape of the inside face of the wall is modified during application of the liquid.",
    "4. The method according to claim 1, further comprising the step of heating the adhesive layer.",
    "5. The method according to claim 4, wherein a heater member performing heating is present in a cavity into which the liquid is inserted.",
    "6. The method according to claim 1, wherein the chamber is defined between the wall and a support defining a cavity into which the liquid is inserted.",
    "7. The method according to claim 1, wherein a plurality of adhesive layers are present on at least one of the parts, the adhesive layers not being in contact with one another and each adhesive layer being present between two parts for bonding together.",
    "8. The method according to claim 1, wherein the wall moves and in that the movement of all or part of the wall is controlled by a member for limiting the movement of the wall.",
    "9. The method according to claim 1, wherein the parts are made of composite material and comprise fiber reinforcement together with a matrix.",
    "10. The method according to claim 1, wherein the first part is made of metal and a second part to which the first part is to be bonded is made of composite material and comprises fiber reinforcement together with a matrix.",
    "11. The method according to claim 1, wherein the parts are made of metal.",
    "12. The method according to claim 1, wherein the first part is an element for constituting, once bonded, a leading edge or a trailing edge, and a second part onto which the first part is to be bonded is a turbine engine blade.",
    "13. A device comprising: a wall defining a chamber, the chamber defining an inside volume in which at least two parts are to be bonded together by means of at least one adhesive layer; and a liquid injection device configured to apply a liquid against the wall, the device being configured so that applying the liquid against the wall does not modify the shape of the inside face of the wall situated beside the chamber and generates sufficient pressure on the wall to move the wall and reduce the inside volume of the chamber, wherein the device further includes a heater member, the heater member being present in a cavity in which the liquid is to be inserted."
  ],
  "description_excerpt": "The invention relates to methods of adhesively bonding parts together and to devices for performing the method. Adhesively bonding a metal leading edge on a turbine engine blade made of composite material is a technical operation that can be relatively complex. Such bonding may involve an operation of placing the layer of adhesive between the two substrates, and raising temperature, while also applying pressure to condition the adhesive layer correctly. It may also be necessary to maintain both the temperature and the pressure for a certain length of time that is sufficient to polymerize the material used in the adhesive layer. Imposing a constant pressure together with a rise in temperature on an adhesive layer having a complex three-dimensional shape can be relatively difficult to achieve. One solution for solving this problem is to make special molds in which the thickness of the adhesive layer is not constant. Nevertheless, the parts obtained by using that solution may fail to have satisfactory mechanical properties.\n\nThe same difficulties can be encountered when adhesively bonding other types of part, such as for example: bonding a metal leading or trailing edge on an outlet guide vane; bonding metal hollow outlet guide vanes; or bonding metal reinforcing sectors on flanges of an axisymmetric casing made of composite material. Consequently, there exists a need to obtain novel methods of bonding parts together that enable a constant pressure to be imposed on the adhesive layer throughout the fabrication cycle.",
  "cpc": [
    "B29C 65/48",
    "B29C 65/02",
    "B29C 65/026",
    "B29C 65/18",
    "B29C 65/26",
    "B29C 65/4815",
    "B29C 65/4835",
    "B29C 65/70",
    "B29C 66/1122",
    "B29C 66/301",
    "B29C 66/532",
    "B29C 66/71",
    "B29C 66/721",
    "B29C 66/7212",
    "B29C 66/7394",
    "B29C 66/742",
    "B29C 66/81455",
    "B29C 66/81459",
    "B29C 70/72",
    "B29C 70/84",
    "B29L 2031/08",
    "B29L 2031/082",
    "F01D 5/147",
    "F01D 5/282",
    "F01D 5/288",
    "F04D 29/023",
    "F04D 29/324",
    "F05D 2230/23",
    "F05D 2300/603",
    "F16B 11/006",
    "Y10T 156/1002",
    "Y10T 156/103",
    "Y10T 156/1031"
  ],
  "ipc": [
    "B29C 65/00",
    "B29C 65/02",
    "B29C 65/18",
    "B29C 65/26",
    "B29C 65/48",
    "B29C 65/70",
    "B29C 70/72",
    "B29C 70/84",
    "B29L 31/08",
    "F01D 5/14",
    "F01D 5/28",
    "F04D 29/02",
    "F04D 29/32",
    "F16B 11/00"
  ],
  "assignees": [
    "SNECMA",
    "SAFRAN AIRCRAFT ENGINES"
  ],
  "inventors": [
    "GODON THIERRY",
    "SCHNEIDER JULIEN",
    "VARIN FRANCK BERNARD LEON"
  ],
  "filing_date": "2014-11-28",
  "publication_date": "2018-11-27",
  "grant_date": "2018-11-27",
  "priority_date": "2013-12-04",
  "application_number": "US-201415101754-A",
  "family_id": "49998543",
  "citations": [
    "EP1767335A2",
    "US2007062641A1",
    "US2008277049A1",
    "WO2007035100A2"
  ]
}