• 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:
    ABSTRACT The inVention relates to a method of making a steel Yankee cylinder l by Welding acylindrical shell 2 to tWo end Walls 3, 4 such that the cylindrical shell 2 and the endWalls 3,4 together form the Yankee cylinder l. The Welding operation is carried outexclusively from the outside of the Yankee cylinder l and in the Welding operation iscarried out as a butt Welding operation in Which a backing material 7 is used on theinside of the Yankee cylinder l such that, between each end Wall 3, 4 and the cylindricalshell 1, a single Weld bead 8 is formed Which extends all the Way between the opposingsurfaces 5, 6 and completely fuses the opposing surfaces 5, 6 of each end Wall 3, 4 andthe cylindrical shell 2 respectiVely.
    公开号:SE1351368A1
    申请号:SE1351368
    申请日:2013-11-19
    公开日:2015-05-20
    发明作者:Stefan Modén；Magnus Högman；Andreas Hjärtqvist
    申请人:Valmet Aktiebolag；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION The invention relates to a method of manufacturing a Yankee cylinder of steel by welding a cylindrical shell to two duct walls.
    BACKGROUND OF THE INVENTION In the manufacture of paper, drying cylinders are used on which wet fibrous webs are dried by heat which causes the water in the fibrous web to evaporate. Paper machines for the manufacture of tissue paper (eg kitchen paper, paper towels or toilet paper) normally have only one drying cylinder called a "Yankee cylinder", which usually has a larger diameter than drying cylinders intended for other paper grades (e.g. newsprint, printing paper or cardboard). The Yankee cylinder is usually made of cast iron, but it has also been suggested that the Yankee cylinder be made by other methods. U.S. Pat. 4320582 shows how an outer shell can be made of steel plates which are butt welded to form a cylindrical welded unit and rings of forged steel are butt welded to the welded unit at its ends. The rings have flanges to which the cradles are attached with bolts. WO 2008/105005 discloses a steel Yankee cylinder having a cylindrical shell and two duct walls which have been welded to the cylinder by a peripheral weld comprising a welding string on the outside of the Yankee cylinder and a welding string on the inside of the Yankee cylinder.
    Since a drying cylinder such as a Yankee cylinder must be filled with hot steam, it must meet the requirements of a pressure vessel. In practice, this meant that high demands were placed on the quality of the weld. To accomplish this, welding is performed from both the inside and outside of the Yankee cylinder. Welding from the inside is problematic, however, as the temperature can reach very high levels and the welder has to work under very stressful conditions. Gas must be removed during welding and fresh air must be supplied. Even with good ventilation, the working conditions for the welder will be very demanding and perhaps even dangerous.
    It is an object of the present invention to provide a method of making a Yankee cylinder of steel which is less demanding on the worker performing the welding and which either eliminates or reduces the need for ventilation during welding.
    DESCRIPTION OF THE INVENTION According to the invention, a Yankee cylinder is made of steel by welding a cylindrical shell to two duck walls so that the cylindrical shell and the duck walls together form the Yankee cylinder. Each duck cradle is welded to the cylindrical shell through a peripheral weld between opposite surfaces of each cradle and the cylindrical shell. According to the invention, the welding operation is performed exclusively from the outside of the Yankee cylinder. Furthermore, the welding is performed as a butt welding in which a supporting material is used on the inside of the Yankee cylinder so that, between each breath wall and the cylindrical shell, a single welding strand is formed. The single welding strand that is formed extends the entire carriage between the opposite surfaces and completely unites the opposite surfaces of the cylindrical shell and the respective duct wall.
    DESCRIPTION OF THE FIGURES Figure 1 shows a longitudinal cross-section of a Yankee drying cylinder.
    Figure 2 shows schematically and in more detail, a cross-section of an area where a duck wall is to be welded to a cylindrical shell.
    Figure 3 shows a view similar to Figure 2 where a welding strand has been made in accordance with an embodiment of the invention.
    Figure 4 is a view corresponding to Figure 3 but where the welding strand has been made in accordance with another embodiment of the invention.
    Figure 5 is a cross section of a finished welded joint that has been ground.
    DETAILED DESCRIPTION OF THE INVENTION Referring to Figure 1, a steel Yankee 1 comprises a cylindrical shell 2 to which two end walls 3, 4 have been welded so that the cylindrical shell is connected to each end wall by a welding string 8. Figure 2 is a schematic reproduction in cross section of a part of the cylindrical shell 2 and a duck wall 4 before the duck wall 4 and the cylindrical shell have been welded together. As can be seen in Figure 2, a surface 6 of the cylindrical shell 2 is placed opposite a surface 5 of the duct 4. When the opposite surfaces 5, 6 of the cylindrical shell 2 and the duck walls 3, 4 are joined by a welding strand 8, the cylindrical shell will 2 and the duck cradles 3, 4 to together form a Yankee cylinder. As well as. can be seen in Figure 2, a patch protrudes from the duck cradle 4 said. that the patch can extend below the inner surface 9 of the cylindrical shell 2. The patch can form a supporting material 7 which can be used during the welding operation which will be explained in the file. It is to be understood that the patch forming a supporting material 7 is annular so that it can follow the inner periphery of the cylindrical shell 2.
    Referring to Figure 3, the method according to the invention comprises welding the cylindrical shell 2 to the two. andvaggarna 3, 4 sa. that the cylindrical shell 2 and the duck walls 3, 4 together form the Yankee cylinder 1. Although Figure 3 only shows a duck cradle 4 on one side, it must be ensured that welding of the other duck cradle 3 to the cylindrical shell 2 takes place on the same salt. Each duct wall 3, 4 is welded to the cylindrical shell 2 by a peripheral weld between the opposite surfaces 5, 6 of the usual duct wall 3, 4 and the cylindrical shell 2. According to the invention, the welding operation is performed only from the outside of the Yankee cylinder 1 and the welding operation is performed as a butt weld in which a standing material 7 is used on the inside of the Yankee cylinder 1. The weld acts on the entire area between the opposite surfaces 5, 6 of each breath wall 3, 4 and the cylindrical shell 2 and filler material and small material penetrates throughout the time. so that the weld strand 8 formed forms the entire path between the opposite surfaces 5, 6. Instead of an outer weld strand and an inner weld strand, there is a single weld strand 8 which completely collapses the opposite surfaces 5, 6 on each end wall 3, 4 and the cylindrical shell 2. The standing material 7 hails the filling material and the small material from the cylindrical shell 2 and the duck walls 3, 4 into place and thus prevents t material from leaving the area where the welding strand 8 is formed. In the embodiment shown in Figure 3, the supporting material 7 is formed by a patch projecting from a duct wall 3, 4 and extending into the area on the inside of the cylindrical shell 2. However, with reference to Figure 4, the supporting material may 7 in the stable is formed by a patch which projects from the usual axial spirit of the cylindrical shell 2 and extends into an area radially inside the opposite duck wall 3, 4. 4 When the welding operation has been completed, the supporting material 7 can be removed by grinding. Preferably, the single weld bead 8 formed between each duct wall 3, 4 and the cylindrical shell 2 is subjected to grinding both on the outside of and on the inside of the Yankee cylinder 2. After grinding, a cross section of the weld joint may look as in Figure 5.
    Figure 5 shows the alien how the cylindrical shell 2 can have peripheral grooves 10 which are separated from each other by peripheral flanges 11 for heat transfer. When using the Yankee cylinder 1, the peripheral flanges 11 serve for improved heat transfer to the outer surface of the Yankee cylinder 1 and condensate will be received in the grooves 10. As can be seen in Figure 5, the thickness of the rocker shell 2 cradle may increase in the direction against the welding strand 8.
    It is to be understood that the supporting material 7 does not necessarily have to be integral with the cylindrical shell 2 or the duck walls 3, 4. The supporting material 7 could in stables be a separate clement.
    The butt welding can be performed as a single V type butt welding operation shown in Figure 2, Figure 3 and Figure 4, but it could also be performed as a single U type butt welding operation. It should be understood that in this context the terms "single V" and " simply U "on the shape of the opposite surfaces 5, 6. In Figures 2, 3 and 4, the opposite surfaces 5, 6 form a" V ".
    The welding method used can be back welding, such as manual metal back welding (MMA), metal back welding with shielding gas or gas metal back welding (GMAW).
    By means of the invention, a Yankee cylinder made of steel can be manufactured in a way that reduces the need for ventilation during welding. Since only a single welding strand Ors, the production of the Yankee drying cylinder also becomes faster and easier.
    权利要求:
    Claims (6)
    [1] 1. . A method of making a steel Yankee cylinder (l) by welding a cylindrical shell (2) to two end walls (3, 4) such that the cylindrical shell (2) and the end walls(3,4) together form the Yankee cylinder (l) and wherein each end wall (3,4) iswelded to the cylindrical shell (2) by a circumferential weld between opposingsurfaces (5, 6) of each end wall and the cylindrical shell (2) respectively,characterized in that the welding operation is carried out exclusiVely from theoutside of the Yankee cylinder (l) and in that the welding operation is carriedout as a butt welding operation in which a backing material (7) is used on theinside of the Yankee cylinder (l) such that, between each end wall (3, 4) and thecylindrical shell (1), a single weld bead (8) is forrned which extends all the waybetween the opposing surfaces (5, 6) and completely fiases the opposing surfaces(5, 6) of each end wall (3, 4) and the cylindrical shell (2) respectively. . A method according to claim l, wherein the butt welding is carried out as a single V butt welding operation or a single U butt welding operation. . A method according to claim l, wherein the single weld bead (8) which has been formed between each end wall (3, 4) and the cylindrical shell (2) is subjected togrinding on both the outside and the inside of the Yankee cylinder (l). . A method according to claim l, wherein the backing material (7) is formed by a lip that protrudes from each end wall (3, 4) and extends into the area on theinside of the cylindrical shell (2) and wherein the lip is removed by grinding afier the welding operation has been completed. . A method according to claim l, wherein the backing material (7) is formed by a lip that protrudes from each axial end of the cylindrical shell (2) and extends into an area radially inside of the opposing end wall (3, 4). . A method according to claim 1, wherein the welding method used is arc welding.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3153719A|1961-08-04|1964-10-20|Kobe Steel Ltd|Submerged welding and deposited metal|
    US3365566A|1965-08-17|1968-01-23|Benedict A. Kuder|Welding process|
    US3688967A|1966-05-09|1972-09-05|Kobe Steel Ltd|Solid composite backing structure for single welding|
    DE2707923A1|1977-02-24|1978-08-31|Voith Gmbh J M|Paper web drying cylinder - stainless steel sleeve welded to carbon steel end cover by carbon steel end ring and having thickness compatible with sleeve and cover|
    US4320582A|1979-03-09|1982-03-23|United States Steel Corporation|Yankee Dryer and method of fabrication|
    JPS60166170A|1984-02-09|1985-08-29|Ishikawajima Harima Heavy Ind Co Ltd|Welding method of inside surface of drum or the like|
    JPH077603Y2|1988-01-29|1995-02-22|株式会社ナブコ|Hydraulic cylinder|
    US20080011812A1|2005-11-04|2008-01-17|General Electric Company|Integral backing ring for stub shaft weld repairs of rotating equipment and related method|
    DE202007019227U1|2007-03-01|2011-05-05|Toscotec S.R.L.|Yankee cylinder for a papermaking machine|
    IT1395588B1|2009-09-09|2012-10-16|Toscotec S P A|"INSULATED MONOLUCID CYLINDER"|
    AT511232B1|2011-03-21|2014-09-15|Andritz Ag Maschf|METHOD FOR PRODUCING A YANKEE CYLINDER|
    ITFI20120018A1|2012-02-09|2013-08-10|Toscotec S P A|"INSULATION SYSTEM FOR A MONOLUCID CYLINDER"|
    CN203091112U|2013-01-09|2013-07-31|重庆江北机械有限责任公司|Centrifuge drum circumferential weld structure|EP3477003B1|2017-10-31|2020-04-01|Valmet Aktiebolag|A method of manufacturing a yankee drying cylinder|
    SE541319C2|2017-11-22|2019-07-02|Valmet Oy|An intermediate product in the manufacturing process of a yankee drying cylinder|
    CN111001960B|2019-12-18|2021-06-11|安德里茨（中国）有限公司|Yankee cylinder section pre-processing piece and method for manufacturing Yankee cylinder|
    JP2021143748A|2020-03-13|2021-09-24|Ｋｙｂ株式会社|Pressure-resistant device and fluid pressure cylinder|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351368A|SE538066C2|2013-11-19|2013-11-19|A method of manufacturing a steel yankee cylinder|SE1351368A| SE538066C2|2013-11-19|2013-11-19|A method of manufacturing a steel yankee cylinder|
    EP14864648.2A| EP3071750A4|2013-11-19|2014-10-29|A method of making a steel yankee cylinder|
    KR1020167010828A| KR102166265B1|2013-11-19|2014-10-29|A method of making a steel yankee cylinder|
    PCT/SE2014/051278| WO2015076718A1|2013-11-19|2014-10-29|A method of making a steel yankee cylinder|
    US15/021,803| US11103947B2|2013-11-19|2014-10-29|Method of making a steel Yankee cylinder|
    JP2016532135A| JP2016539006A|2013-11-19|2014-10-29|How to make a steel Yankee cylinder|
    CN201480053846.XA| CN105612286A|2013-11-19|2014-10-29|A method of making a steel yankee cylinder|
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