• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject of this invention is a method for treating a Yankee cylinder, wherein the Yankee cylinder has a steel cylinder jacket with a ferritic-pearlitic structure (steels from ASME SA516, ASME SA36 and AD2000 W1 steels 2.1 to 2.4). According to the invention, the outer surface of the cylinder jacket is heat-treated with a laser beam and thereby hardened.
    公开号:AT519996A2
    申请号:T50458/2017
    申请日:2017-06-01
    公开日:2018-12-15
    发明作者:Ing Dr Yassar Gahanimi Dipl；Ing Michael Jesse Dipl
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    METHOD FOR TREATING THE SURFACE OF A STEEL YANKEE
    The subject of this invention is a method for treating a Yankee cylinder, the Yankee cylinder having a cylinder jacket made of steel with a ferritic-pearlitic structure.
    For the production of paper webs or tissue, it is common to use so-called Yankee cylinders in the drying process.
    Yankee cylinders usually have a very large diameter. They are heated from the inside with steam and are difficult to manufacture, since very high requirements with regard to internal pressures, tightness and the large diameters have to be met.
    Commercial Yankee cylinders have the following dimensions, for example:
    Cylinder diameter: 2000 mm to 6500mm
    Hollow shaft diameter: 1000 mm to 2500 mm
    Cylinder length: 3000 mm to 8500mm
    Cylinder mass: 35 t to 180 t
    During the drying process of a fibrous web, a doctor blade rests on the outer peripheral surface of the Yankee cylinder, with which the dried fibrous web is scraped off the Yankee surface. If the scraper blade comes into contact with the cylinder surface, it cannot be ruled out that material will be removed from the Yankee surface. To reduce this material removal, it is common to use the Yankee2 / 11
    2683 AT
    Coating the surface with a hard material layer. EP 2 474 665 A1 describes, for example, a Yankee cylinder which is coated with a corresponding hard material layer.
    Yankee cylinders were previously made primarily from cast iron, from the U.S. However, US Pat. No. 4,196,689 and WO 2008/105005 Al also already know Yankee cylinders made of steel.
    Yankee cylinders made of steel have a higher drying performance than cast cylinders due to the better thermal conductivity of the steel.
    However, since steel (hardness 140 HB) has a lower hardness than cast iron (hardness 240 HB), steel lanyards are thermally coated with wear protection. A wire is melted and sprayed onto the Yankee surface, the resulting thermally sprayed layer has a considerably higher hardness than steel.
    The sprayed-on layers have a layer thickness of approximately 0.75 mm.
    However, this type of surface treatment is quite complex since the cylinder surface has to be sandblasted before coating and ground and polished after thermal coating. There is also a risk of the coating flaking off.
    The main disadvantage of this thermally sprayed layer, however, lies in its relatively low thermal conductivity. The thermal conductivity of a thermally sprayed layer is only in the range of 3-7 W / mK. In contrast, / 11
    2683 AT 3 the steel jacket of the Yankee has a thermal conductivity of up to 45 W / mK.
    The aim of the invention is to provide a method for the surface treatment of a steel Yankee cylinder that is as hard as possible
    Surface layer with a high thermal conductivity results.
    This object is achieved with a method according to claim 1.
    According to the invention, the outer surface of the cylinder jacket is heat treated with a laser beam and thus hardened.
    The entire outer surface of the Yankee cylinder jacket is scanned by a laser beam, heated and hardened in this way.
    A hardened steel lankee according to the invention thus has a 7% higher heat transfer and enables one
    Production increased by 5% compared to conventionally coated steel Yankee cylinders.
    The thickness of the hardened surface layer is between 0.3 and 1.5 mm.
    Conventional laser beam hardening is a transformation hardening in which ferritic-pearlitic steel is heated very quickly (at approx. 1,000 K / s) to a temperature at which the lattice structure changes into a fine austenite. The cementite flakes in pearlite dissolve and the released carbon diffuses into the interior of the austenite grain. If the laser beam
    4/11
    2683 AT moves, the material quickly cools down due to self-quenching and the lattice structure changes again. In a conventional process for laser hardening, the extremely rapid cooling suppresses the diffusion of the carbon, which is evenly dissolved in the austenite. This prevents the formation of the ferritic-pearlitic microstructure and the hard martensite forms. Although martensite is very hard, the formation of martensite on the Yankee surface would be disadvantageous. Martensite favors the formation of microcracks, which can significantly shorten the life of the steel cylinder.
    Preferably, therefore, there is no structural change in the method according to the invention, but only re-granulation, as a result of which fine-grain hardening takes place. The ferritic-pearlitic structure is preserved and the formation of martensite is prevented. The cooling of the austenitized layer must remain below the lower critical cooling rate. The martensite begins to form at the lower critical cooling rate.
    It is advantageous if steels made of ASME SA516, ASME SA36 and AD2000 W1 steels 2.1 to 2.4 are used as the base material for the cylinder jacket. be used. For example, P355NH (DIN EN 10028-3) is well suited as a base material.
    This fine-grain structural steel is characterized by a minimum yield strength of 275-460 MPa as well as good weldability and resistance to brittle fracture. With laser beam hardening, hardnesses of up to 400 HB can be achieved if hardening is carried out in the conventional way. With this new process, a max. Hardness of 320HB / 11
    Aimed for 2683 AT, with excellent thermal conductivity in the range of 45 W / mK.
    For comparison, the hardness of cast cylinders is in the range of 230 - 280 HB.
    It is advantageous if the surface of the Yankee cylinder is briefly heated to a temperature between 800 ° C and 900 ° C by the laser beam. A high-power diode laser or CO 2 laser is preferably used for the heat treatment, so that heating rates of> 1000 ° C / s can be achieved.
    The laser beam can also be used to create a pattern on the cylinder surface which can facilitate the formation of a chemical coating film. The chemical coating can be used to perform various secondary tasks (adhering the fibrous web to the cylinder surface, detaching the fibrous web at the end of the drying process, and influencing the properties of the tissue produced). For example, the laser beam can be used to burn a large number of depressions uniformly distributed over the surface of the jacket, so that a porous surface is thereby produced.
    Preferably, the surface of the Yankee cylinder is polished after the heat treatment. As a rule, it is no longer necessary to sand the surface.
    In order to shorten the treatment time, it is also conceivable that the outer surface of the cylinder jacket is heat-treated with several laser beams at the same time.
    The method according to the invention is described below by way of example.
    6/11
    2683 AT
    The largely finished Yankee cylinder is preferably rotatably clamped horizontally with its stub axles. The surface of the jacket is heat-treated using one or more laser beams. The Yankee is rotated slowly so that the laser beam sweeps over the entire circumferential area. By moving the laser in the axial direction (parallel to the Yankee axis) the entire surface of the cylinder jacket can be heat treated. The processing time can be shortened by using several lasers. The treatment can be carried out using high-power diode lasers that generate a powerful, high-energy laser beam.
    This leads to a very rapid partial heating of the component (> 1000 ° C / s). Then there is self-quenching due to heat dissipation into the interior of the component and the surroundings. This creates a hardened track with a fine-grained microstructure. Starting the Yankee can also be omitted.
    The Yankee is still polished after the heat treatment, but it is also conceivable that polishing can be dispensed with.
    It is also conceivable that the Yankee is heat-treated directly at its place of use when installed. In this way, already used Yankee cylinders can be hardened afterwards.
    权利要求:
    Claims (10)
    [1]
    Claims
    1. A method for treating a Yankee cylinder, wherein the Yankee cylinder has a steel cylinder jacket with a ferritic-pearlitic structure, characterized in that the outer surface of the cylinder jacket is heat-treated with a laser beam and thus hardened.
    [2]
    2. A method of treating a Yankee cylinder according to claim 1, characterized in that the heat treatment causes the structure to be grained on the surface, but the ferritic-pearlitic structure is largely retained.
    [3]
    3. A method for treating a Yankee cylinder according to claim 1 or 2, characterized in that P355NH weldable fine-grained structural steel is used as the steel for the cylinder jacket.
    [4]
    4. A method for treating a Yankee cylinder according to one of claims 1 to 3, characterized in that the surface is heated by the laser beam to a temperature between 800 ° C and 900 ° C.
    [5]
    5. A method for treating a Yankee cylinder according to one of claims 1 to 4, characterized in that the heat treatment is carried out with the aid of a diode laser or CO2 laser.
    [6]
    6. A method for treating a Yankee cylinder according to one of claims 1 to 5, characterized in that a pattern is generated on the cylinder surface with the aid of the laser beam.
    8/11
    2683 AT
    [7]
    7. A method for treating a Yankee cylinder according to claim 6, characterized in that a porous surface is generated by the laser beam.
    [8]
    8. Procedure for treating a Yankee cylinder after
    5 one of claims 1 to 7, characterized in that the surface of the Yankee cylinder is polished after the heat treatment.
    [9]
    9. A method for treating a Yankee cylinder according to one of claims 1 to 8, characterized in that
    [10]
    10 the outer surface of the cylinder jacket is simultaneously heat-treated with several laser beams.
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    同族专利:
    公开号 | 公开日
    AT519996B1|2020-03-15|
    CN110741100A|2020-01-31|
    HUE054431T2|2021-09-28|
    US20200199697A1|2020-06-25|
    BR112019022425A2|2020-05-19|
    PT3631023T|2021-03-15|
    EP3631023A1|2020-04-08|
    SI3631023T1|2021-04-30|
    WO2018219516A1|2018-12-06|
    AT519996A3|2020-03-15|
    ES2863430T3|2021-10-11|
    DK3631023T3|2021-04-12|
    PL3631023T3|2021-07-05|
    EP3631023B1|2021-01-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS6021355A|1983-07-13|1985-02-02|Mitsui Eng & Shipbuild Co Ltd|Cast iron cylinder liner and its manufacture|
    JPS61266520A|1985-05-20|1986-11-26|Brother Ind Ltd|Production of cast iron product|
    DE19629332C1|1996-07-20|1997-06-05|Deutsche Bahn Ag|Piston cylinder running surface|
    JP2003231914A|2002-02-13|2003-08-19|Toyota Motor Corp|Laser hardening method|
    EP2628808A1|2012-02-15|2013-08-21|Longevity Engineering SA|Localized hardening of metallic surfaces|
    CN1019024B|1989-11-28|1992-11-11|江西省机械工业设计研究院|Laser heat-treatment for the shell of spherulitic iron steering gear of rare-earth ferrite|
    DE102007000508B4|2007-10-15|2011-09-15|Koenig & Bauer Aktiengesellschaft|Dryer for at least one material web|
    CN102839260A|2011-06-23|2012-12-26|中国石油天然气集团公司|Elongated tube inner wall laser surface phase change hardening method|
    DE102012104464A1|2012-05-23|2013-11-28|Gapcon Gmbh|Temperable cylinder for the treatment of flat materials|
    US20160032527A1|2012-10-09|2016-02-04|Journey Electronics Corp.|Yankee drier profiler and control|
    SE538065C2|2013-03-13|2016-02-23|Valmet Aktiebolag|Yankee cylinder made of steel|
    EP3556936B1|2018-04-17|2020-04-29|Valmet Aktiebolag|Method for manufacturing a steel-made yankee cylinder|SE1950671A1|2019-06-05|2020-12-06|Valmet Oy|A machine and a method for making tissue paper|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50458/2017A|AT519996B1|2017-06-01|2017-06-01|Steel surface treatment method|ATA50458/2017A| AT519996B1|2017-06-01|2017-06-01|Steel surface treatment method|
    DK18722893.7T| DK3631023T3|2017-06-01|2018-03-22|Method for surface treatment of a steel friction cylinder |
    HUE18722893A| HUE054431T2|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
    US16/616,661| US20200199697A1|2017-06-01|2018-03-22|Method for the Surface Treatment of a Steel Yankee|
    BR112019022425A| BR112019022425A2|2017-06-01|2018-03-22|method for surface treatment of steel yankee cylinder|
    PCT/EP2018/057261| WO2018219516A1|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
    PT187228937T| PT3631023T|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
    CN201880036647.6A| CN110741100A|2017-06-01|2018-03-22|Surface treatment method of steel Yangke cylinder|
    PL18722893T| PL3631023T3|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
    SI201830217T| SI3631023T1|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
    ES18722893T| ES2863430T3|2017-06-01|2018-03-22|Procedure for treating the surface of a steel Yankee machine|
    EP18722893.7A| EP3631023B1|2017-06-01|2018-03-22|Method for the surface treatment of a steel yankee|
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