Method for producing plate packs

{
  "publication_number": "US10836148B2",
  "country": "US",
  "kind": "B2",
  "title": "Method for producing plate packs",
  "abstract": "Plate packs are produced from a sheet-like starting product (1), which is cut to form plates, which are stacked to form a plate pack. The plates within the plate stack are joined to one another by a bonding agent. The bonding agent used is a cyanoacrylate adhesive with a high temperature stability rating. It is applied to a wetting layer (14) for the adhesive. The wetting layer (14) is formulated to a pH in a region >7. The cyanoacrylate adhesive with a high temperature stability rating is able to spread on the wetting layer (14) such that effective wetting takes place, thus achieving quick and secure joining of the plates to one another.",
  "claims": [
    "1. A method for producing lamination packs, the method comprising: punching laminations from a flat starting product; stacking the laminations to a lamination stack; connecting the laminations in the lamination stack to each other by a high temperature-resistant cyanoacrylate adhesive applied to a wetting layer provided on the laminations and adjusted to a pH value in a range >7, wherein the high temperature-resistant cyanoacrylate adhesive has a high temperature resistance of at least 130° C.",
    "2. The method according to claim 1, further comprising preparing the wetting layer from dipropylene glycol, distilled and/or demineralized and/or deionized water, and, optionally, at least one additive.",
    "3. The method according to claim 2, further comprising selecting the at least one additive from the group consisting of diamond; polyglycol oil; corrosion protection additives; and alkaline additives; and combinations thereof.",
    "4. The method according to claim 2, further comprising preparing the wetting layer to contain between approximately 30% to approximately 75% by weight distilled and/or demineralized and/or deionized water and approximately 25% to approximately 70% by weight dipropylene glycol.",
    "5. The method according to claim 2, further comprising selecting a proportion of the at least one additive to be between 0% and approximately 20% by weight of the wetting layer.",
    "6. The method according to claim 1, further comprising spraying the wetting layer onto the starting product.",
    "7. The method according to claim 1, further comprising brushing the wetting layer onto the starting product.",
    "8. The method according to claim 1, further comprising applying the wetting layer by polishing the wetting layer onto the starting product.",
    "9. The method according to claim 1, further comprising applying the wetting layer onto an entire surface of the starting product.",
    "10. The method according to claim 1, further comprising applying the wetting layer onto a first face of the starting product and a second face of the starting product.",
    "11. The method according to claim 1, further comprising applying the wetting layer in an advancing direction of the starting product upstream of a punching device onto the starting product.",
    "12. The method according to claim 1, further comprising applying the wetting layer by at least one application unit, provided at a punching tool, onto the starting product.",
    "13. The method according to claim 1, further comprising providing an application unit for the high temperature-resistant cyanoacrylate adhesive at a punching tool.",
    "14. The method according to claim 1, further comprising applying the high temperature-resistant cyanoacrylate adhesive and the wetting layer onto the starting product immediately prior to punching.",
    "15. The method according to claim 1, further comprising applying the high temperature-resistant cyanoacrylate adhesive and the wetting layer onto the laminations immediately after punching.",
    "16. The method according to claim 1, further comprising providing the starting product as a strip-shaped starting product and applying the wetting layer onto the strip-shaped starting product, in an advancing direction of the strip-shaped starting product, after coating the strip-shaped starting product and prior to winding the strip-shaped starting product onto a coiler.",
    "17. The method according to claim 1, further comprising providing the starting product as a strip-shaped starting product and applying the wetting layer onto the strip-shaped starting product, in an advancing direction of the starting product, prior to splitting the strip-shaped starting product."
  ],
  "description_excerpt": "The invention concerns a method for producing lamination packs in which laminations are cut from a flat starting product and stacked to the lamination pack, wherein the laminations in the lamination stack are connected to each other by a bonding agent.\n\nIn electrical machines, sheet metal packs made of stacked laminations are often used which are produced from cut electric sheets or electric strips. For cutting the laminations, usually a punch press with tool or a laser cutting machine is employed. The electric sheets/strips as starting products are in general coated with a thin electrical insulation layer whose thickness is within the μm range. These insulation layers are comprised of organic or inorganic material. Hybrid coatings are also employed which are comprised of organic and inorganic proportions. For the electrical insulation layers, varnishes are employed which are adjusted such that they have a positive effect on the cutting processes and pack assembly method, respectively.\n\nThe lamination packs are used for stators and rotors of electrical machines such as electric motors or generators. In order for the laminations lying on top of each other to be connected fixedly to each other within the lamination pack, it is known to connect the laminations lying on top of each other by means of an adhesive. Sometimes, a reliable bonding of laminations lying on top of each other cannot be ensured due to the electrical insulation layers. Sometimes, the reaction time of the adhesive is prolonged.",
  "cpc": [
    "B32B 37/1284",
    "B29C 65/48",
    "B29C 65/482",
    "B29C 65/52",
    "B29C 65/72",
    "B29C 65/74",
    "B29C 65/76",
    "B29C 66/004",
    "B29C 66/00461",
    "B29C 66/026",
    "B29C 66/028",
    "B29C 66/41",
    "B29C 66/45",
    "B29C 66/71",
    "B32B 15/00",
    "B32B 2037/1261",
    "B32B 2307/206",
    "B32B 2457/00",
    "B32B 37/18",
    "B32B 38/0004",
    "B32B 7/12",
    "C09J 2400/163",
    "C09J 2400/166",
    "C09J 2433/00",
    "C09J 5/02",
    "F16B 11/006",
    "H02K 15/02"
  ],
  "ipc": [
    "B29C 65/00",
    "B29C 65/48",
    "B29C 65/52",
    "B29C 65/72",
    "B29C 65/74",
    "B29C 65/76",
    "B32B 15/00",
    "B32B 37/12",
    "B32B 37/18",
    "B32B 38/00",
    "B32B 7/12",
    "C09J 5/02",
    "F16B 11/00",
    "H02K 15/02"
  ],
  "assignees": [
    "Kienle and Spiess GmbH"
  ],
  "inventors": [
    "Björn Böker"
  ],
  "filing_date": "2016-12-01",
  "publication_date": "2020-11-17",
  "grant_date": "2020-11-17",
  "priority_date": "2015-12-09",
  "application_number": "US-201615781137-A",
  "family_id": "57609831",
  "cited_by_count": 0,
  "citations": [
    "JPS5594979A",
    "JPS6018560A",
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    "EP1731578A1",
    "US20070209175A1",
    "JP2009084390A",
    "CN102369252A",
    "CN102216405A",
    "US20130076193A1",
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    "EP2897254A2",
    "US20150207366A1",
    "EP3021466A2",
    "US20160141942A1"
  ]
}