• 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:
    A device for forging a hollow body (1) with forging tools (2) arranged centrally symmetrically about a forging axis and with a forging mandrel (3) is described. In order to provide advantageous design conditions for the production of different hollow bodies (1), it is proposed that the forging mandrel (3) a mandrel core (7) and around the circumference of the mandrel core (7) distributed, on the mandrel core (7) exchangeably held, molding surfaces ( 9) for the cavity of the hollow body (1) forming mandrel segments (8).
    公开号:AT511748A1
    申请号:T1171/2011
    申请日:2011-08-12
    公开日:2013-02-15
    发明作者:
    申请人:Gfm Gmbh；
    IPC主号:
    专利说明:

    (37955) II
    The invention relates to a device for forging a hollow body with centrally symmetrically arranged around a forging axis forging tools and a forging mandrel.
    The forging of hollow bodies, in particular of tubes, has the advantage over the known rolling methods for producing such hollow bodies, inter alia, that different outer shapes of the hollow body can be produced due to the comparatively simple replacement of the forging tools and the generally possible possibility of tool adjustment. However, this does not apply to the inner shape of the hollow body defining forging mandrels, which are made of a heat-resistant material and must have a respective inner diameter of the hollow body corresponding outer diameter, so that for different inner contours of the hollow body to be produced each separate forged mandrels must be used.
    The invention is therefore based on the object to reduce the costs associated with the conversion of forging devices for the production of hollow bodies with different cavity dimensions effort, in particular with regard to the storage of the forged mandrels.
    Starting from a forging device of the type described above, the invention achieves the stated object in that the forging mandrel forms a mandrel core and distributed around the circumference of the mandrel core, interchangeable on the mandrel core, forming molding surfaces for the hollow space of the hollow body Dorn segments includes.
    Since, according to this measure, a uniform mandrel core can be used for different diameters of the cavity of the hollow body to be produced, while the forming surfaces defining the formation of the inner contour of the hollow body are assigned mandrel segments which are held replaceably on the mandrel core, this results in the possibility of the respective mandrel core Inner diameters of the hollow body to be manufactured adapted mandrel segments to use without having to replace the mandrel core. These interchangeable, over the circumference of the mandrel core distributed mandrel segments allow not only a simple adaptation of the forging mandrel to different dimensions of the hollow body, but also bring better opportunities for material utilization with it, because the heat-resistant materials need to be used only in the mandrel segments.
    In addition, the mandrel segments can be thermally insulated from the mandrel core, so that the mandrel core can be largely relieved of higher thermal loads. In addition, there are favorable conditions for any cooling or heating of the mandrel segments, which can be connected via appropriate in the mandrel core lines for a cooling or heating medium to appropriate cooling or heating.
    The holder of the mandrel segments on the Domkem can be solved constructively in different ways. A simple way to replace the mandrel segments without special effort, is to use the Domsegmente in behind-cut grooves of the mandrel core form-fitting. It is basically possible to arrange the undercut grooves parallel or transverse to the mandrel axis, so that the mandrel segments are detected once along their longitudinal edges and the other times the front side. - * 3 ^ *
    The undercut grooves may be incorporated in the mandrel core. Particularly simple construction conditions, however, arise when at least one side wall of the undercut grooves is formed as releasably connected to the mandrel core profile strip, because in this case, the associated mandrel segments can be removed transversely to the longitudinal direction of the undercut groove from the mandrel core by loosening this profile.
    In order to achieve different diameters for the hollow body, different mandrel segments can be used in their radial extent. So that the required number of different mandrel segments can be kept small, the mandrel segments can be supported by spacers on the mandrel core. By adjustable or replaceable spacers thus the diameter of the enveloping circles of the mandrel segments can be adapted to the inner dimensions of the hollow body to be produced without having to replace the mandrel segments. The deviations of the shaping surfaces of the mandrel segments from the respective enveloping circle does not matter if the hollow body to be manufactured is rotated accordingly with respect to the forging mandrel.
    Particularly simple conditions for converting a forging mandrel to different inner dimensions of the hollow body to be produced arise when the mandrel segments are mounted radially adjustable on the mandrel core via wedge gear. To change the outer diameter of the forging mandrel, only the wedge gear are to be actuated in this case, which opens the additional possibility to produce hollow body with conically tapered cavities in the axial direction, because yes, the diameter of the forging mandrel during the advance of the workpiece can be changed accordingly ,
    The mandrel segments distributed over the circumference of the mandrel core can also be used for the production of hollow bodies with longitudinally grooved cavities. In this case, both the mandrel segments and the peripheral portions of the mandrel core between the mandrel segments form molding surfaces for the cavity of the hollow body. Prerequisite, however, is that the forging mandrel with the workpiece
    * * * * * »I t I * *» * · Α · »· · * * * · ^ f t · * * · · II v * i is turned on. When the mandrel core is mounted in a continuously variable manner in the radial direction on the mandrel core, the mandrels defined by the mandrel segments in the inner wall of the hollow body can also have a depth that changes over the length of the hollow body.
    In the drawing, the subject invention is for example shown
    1 shows a device according to the invention for forging a hollow body in sections in the region of the forging tools in a schematic longitudinal section,
    2 shows a forging mandrel in a partially opened-up simplified side view,
    3 shows the forging mandrel 2 in a frontal view on a larger scale,
    FIG. 4 is a representation corresponding to FIG. 2 of a variant of a forging mandrel, FIG.
    5 is a section along the line V-V of Fig. 4,
    6 shows another embodiment of a forging mandrel in a side view, FIG. 7 shows the forging mandrel according to FIG. 6 in section along the line VII-VII, FIG.
    Fig. 8 shows a forging mandrel with radially adjustable mandrel segments in a simplified axial section and
    Fig. 9 is a section along the line IX-IX of Fig. 8 on a larger scale.
    According to FIG. 1, forging a hollow body 1, in the case of the exemplary embodiment, a pipe, forged to a forging axis centrically symmetrically arranged forging tools 2, which cooperate with a forging mandrel 3. The hollow body 1 is conveyed by means of a clamping device 4 in the feed direction 5 between the forging tools 2, which beat the hollow body 1 against the forging mandrel 3. About the clamping device 4, the hollow body 1 can be issued if necessary, a rotation about the forging axis. The forging mandrel 3 is conventionally attached to a mandrel 6, on the depending on the forging conditions a lubricant and cooling or
    Heating media the forging mandrel 3 can be supplied. About the mandrel 6, the forging mandrel 3 can also be driven in rotation, if required by the use.
    The forging mandrel 3 differs from conventional forged mandrels because it is composed of a mandrel core 7 and mandrel segments 8, which are distributed around the circumference of the mandrel core 7 depending on the circumferential distribution of the forging tools 2 and form mold surfaces 9 for the cavity of the hollow body 1. As can be seen in FIGS. 3 to 7, different possibilities for supporting the mandrel segments 8 on the mandrel core 7 are available. According to FIGS. 2 and 3, the mandrel segments 8 are guided in longitudinal grooves 10 of the mandrel core 7 and are clamped down in the radial direction. For this purpose, the mandrel core 7 for receiving the end of the mandrel segments 8 undercuts 11, which cooperate with undercuts 12 of moldings 13, so that between the undercuts 11 of the mandrel core 7 and the undercuts 12 of the profile strips 3 undercut grooves for receiving the end in the longitudinal grooves 10 guided mandrel segments 8 result.
    According to FIGS. 4 and 5, the mandrel core 7 has dovetail-shaped undercut grooves 14 for the positive retention of the mandrel segments 8. The mandrel segments 8 shown in FIGS. 6 and 7 are also held in undercut grooves 14, but these undercut grooves 14 are formed in the embodiment of FIGS. 6 and 7 by the groove walls forming profile strips 15.
    The Domsegmente 8 can be supported by spacers 16 on the mandrel core 7. About this spacer 16 thus the enveloping circle of the mandrel segments 8 can be adapted to the respective requirements. The spacers 16 can also serve for thermal insulation of the mandrel 7 relative to the mandrel segments 8.
    The mandrel segments 8 can be made of different materials. In order not to manufacture the entire mandrel segments 8 from a heat-resistant material, the • •• * ·· * * · * • ·
    len, the mandrel segments 8 may be constructed of a supporting body 17 and the forming surfaces 9 forming, heat-resistant wear body 18, as can be seen for example in FIGS. 3 and 4.
    In Figs. 5 and 7, the possibility of cooling or heating of the mandrel segments 8 is indicated by channels 19 are formed in the mandrel core 7 for guiding a cooling or heating medium, which are connected via the mandrel 6 to a cooling or heating ,
    The embodiment of the forging mandrel 3 according to FIGS. 8 and 9 differs from the other embodiments in that the mandrel segments 8 are mounted radially adjustable on the mandrel core 7, via a wedge gear 20. These wedge gear 20 for the individual mandrel segments 8 have the Mandrel core 7 associated wedge surfaces 21 which cooperate with counter wedge surfaces 22 of the mandrel segments 8, which are guided longitudinally displaceable in dovetail undercut grooves 23 of the mandrel 7 to prevent radial lifting of the mandrel segments 8 from the mandrel core 7. The mandrel segments 8 are connected to an adjusting sleeve 24, via which the mandrel segments 8 can be displaced axially relative to the Dornkem 7, whereby due to the cooperating wedge surfaces 21 and 22, a radial displacement of the mandrel segments 8 is connected. This radial movement of the mandrel segments 8 relative to the adjusting sleeve 24 is ensured by a corresponding guide of the adjusting sleeve 24 in radially extending undercut grooves 25. FIG. 8 shows the position of the mandrel segments 8 in the radially extended and radially retracted position.
    It can be seen from FIG. 9 that the circumferential sections 26 of the mandrel core 7 between the mandrel segments 8 can also serve as forming surfaces for the shaping of the inner wall of the hollow body when the forging mandrel participates in the rotational movements of the hollow body during the forging process. In such a case, hollow body 1 can be produced with internal grooves, which can also have a different depth over their length in a continuous adjustment of the wedge gear.
    权利要求:
    Claims (8)
    [1]
    t * * · ··· * * φ · fe · * ·. ## · • ·· * «·· · Patent Attorneys Dipl.-Ing. Helmut Hübscher Dipl.-Ing. 1. Apparatus for forging a hollow body (1) with forging tools (2) arranged centrally symmetrically about a forging axis and with a forging mandrel (3), characterized in that the forging mandrel (3) a mandrel core (7) and around the circumference of the mandrel core (7) distributed, on the mandrel core (7) exchangeably held, forming surfaces (9) for the cavity of the hollow body (1) forming mandrel segments (8).
    [2]
    2. Apparatus according to claim 1, characterized in that the mandrel segments (8) relative to the mandrel core (7) are arranged thermally insulated.
    [3]
    3. Apparatus according to claim 1 or 2, characterized in that the mandrel segments (8) are connected to a cooling or heating device.
    [4]
    4. Device according to one of claims 1 to 3, characterized in that the mandrel segments (8) in undercut grooves (14) of the mandrel core (7) are inserted form-fitting.
    [5]
    5. Apparatus according to claim 4, characterized in that at least one side wall of the undercut grooves (14) as a releasably connected to the mandrel core (7) profile strip (13, 15) is formed.
    [6]
    6. Device according to one of claims 1 to 5, characterized in that the mandrel segments (8) via spacers (16) on the mandrel core (7) are supported.
    [7]
    7. Device according to one of claims 1 to 3, characterized in that the mandrel segments (8) via wedge gear (20) radially adjustable on the mandrel core (7) are mounted.
    [8]
    8. Device according to one of claims 1 to 7, characterized in that both the Domsegmente (8) and the peripheral portions (26) of the mandrel core (7) between the mandrel segments (8) forming surfaces (9) for the cavity of the Hohlköpers (1 ) form. Linz, on August 11, 2011 GFM-GmbH

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    公开号 | 公开日
    EP2556906B1|2017-06-07|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT350356B|1977-08-30|1979-05-25|Gfm Fertigungstechnik|FORGING THORN|DE102015216965A1|2015-09-04|2017-03-09|Sms Group Gmbh|Tool and method for forging a pipe and forming machine|US1683573A|1925-10-17|1928-09-04|Adolph Mueller|Pipe-bending mandrel or punch|
    US1654536A|1925-11-11|1928-01-03|Heine Boiler Co|Internal mandrel for sectional-boiler headers|
    US1638633A|1925-11-11|1927-08-09|Heine Boiler Co|Internal mandrel for sectional boiler headers|
    US4131988A|1976-10-29|1979-01-02|The Globe Tool And Engineering Company|Method of manufacturing a dynamoelectric field member|
    AT347386B|1977-07-01|1978-12-27|Voest Ag|REEL, IN PARTICULAR FOR TIN STRIP|
    DE2754443A1|1977-12-07|1979-06-13|Hahn Hermann Dr Ing|Forging press for making cylindrical follow workpieces - has anvil and ram for cylindrical blank with internal expanding tools|
    CA1225328A|1983-10-31|1987-08-11|Baker Oil Tools, Inc.|Segmented concentric centralizer|
    JP2521958B2|1987-06-10|1996-08-07|石川島播磨重工業株式会社|Pipe forging equipment|
    DE69310722T2|1993-06-14|1997-09-11|Ist Nazionale Fisica Nucleare|Manufacturing process of seamless radio frequency resonance cavities and product obtained thereby|
    JP2001509737A|1996-11-21|2001-07-24|グラン・プリ・サイレンサーズ・ベスローテン・フェンノートシャップ|Bending mandrel|
    DE10142179A1|2001-08-29|2003-03-20|Sms Demag Ag|Method and device for reeling thin metal strip, in particular hot or cold rolled thin steel strip|
    AU2004217540B2|2003-02-28|2008-09-04|Baker Hughes Incorporated|Compliant swage|
    AT501152B8|2003-12-30|2007-02-15|Gfm Beteiligungs & Man Gmbh|METHOD AND DEVICE FOR PRODUCING A CYLINDRICAL HOLLOW BODY FROM A BOARD|
    DE102005052178B4|2004-10-25|2008-06-19|V&M Deutschland Gmbh|Method for producing a seamless hot-worked steel tube|
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    法律状态:
    2018-04-15| MM01| Lapse because of not paying annual fees|Effective date: 20170812 |
    优先权:
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