Method of manufacturing a heat exchanger

{
  "publication_number": "US3922768A",
  "country": "US",
  "kind": "A",
  "title": "Method of manufacturing a heat exchanger",
  "abstract": "A heat exchanger of the type characterized by a plurality of pipes serving as the heat exchange component and connected at their opposite ends to a pair of end plates is formed without welding or brazing by inserting the tip portions of each of the pipes into holes bored into the end plates and then pressing inwardly on the peripheries of the end plates to plastically deform the end plates and thereby secure the pipes therein in tightly sealed relation with the holes bored in the end plates.",
  "claims": [
    "1. A method for manufacturing heat exchangers having a plurality of pipes as the heat exchanging component and opposing end plates to which the pipes are connected, comprising the steps of: inserting each tip portion of each of said pipes into holes bored in said end plates; and subjecting the end plates to plastic deformation by pressing inwardly and uniformly on the peripheries of the end plates so that the pipes are thereby secured therein in tightly sealed relationship without welding or brazing.",
    "2. The method as set forth in claim 1, wherein the pipes and end plates are disposed within a cylindrical body before said end plates are subjected to said plastic deformation, and said force for said plastic deformAtion is applied to said end plates and said pipes through the cylindrical body.",
    "3. The method as set forth in claim 1, wherein each tip portion of each of said pipes is inserted into holes bored in a plurality of end plates disposed adjacent one other, and said forces for said plastic deformation are respectively applied to the peripheries of said plurality of end plates disposed adjacent to each other.",
    "4. The method as set forth in claim 2, further comprising forming a notch on the peripheries of said end plates before said end plates are disposed in the cylindrical body.",
    "5. The method as set forth in claim 2, further comprising forming a groove on the inner surface of said cylindrical body before said end plates are disposed in the cylindrical body.",
    "6. The method as set forth in claim 1, further comprising machining the end plates after subjecting said end plates to said plastic deformation.",
    "7. The method as set forth in claim 2, further comprising placing a sealing material between the peripheries of said end plates and the inner surface of said cylindrical body before subjecting said end plates to plastic deformation.",
    "8. The method as set forth in claim 1, further comprising positioning said plastically deformed end plates and pipes in a cylindrical body and welding the cylindrical body to the peripheries of the end plates therein."
  ],
  "cpc": [
    "F28F 9/16",
    "B21D 39/06",
    "B21D 53/06",
    "F28F 9/0219",
    "Y10T 29/49373",
    "Y10T 29/49925",
    "Y10T 29/49927"
  ],
  "assignees": [
    "TAKAYASU KIYOTELU"
  ],
  "filing_date": "1974-06-26",
  "publication_date": "1975-12-02",
  "grant_date": "1975-12-02",
  "priority_date": "1973-06-26",
  "application_number": "US-48329974-A",
  "family_id": "27565184",
  "citations": [
    "US2944326A",
    "US3068160A",
    "US3279532A",
    "US3710858A",
    "US3787945A",
    "US407982A",
    "US513620A"
  ]
}