WO2021000975A1 - Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner - Google Patents

Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner Download PDF

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Publication number
WO2021000975A1
WO2021000975A1 PCT/DE2019/100608 DE2019100608W WO2021000975A1 WO 2021000975 A1 WO2021000975 A1 WO 2021000975A1 DE 2019100608 W DE2019100608 W DE 2019100608W WO 2021000975 A1 WO2021000975 A1 WO 2021000975A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
contour segment
contour
adapter
suction line
Prior art date
Application number
PCT/DE2019/100608
Other languages
German (de)
English (en)
Inventor
Rupert Hune
Ludwig BORCHERT
Original Assignee
Josef Weischer GmbH & Co. KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Josef Weischer GmbH & Co. KG filed Critical Josef Weischer GmbH & Co. KG
Priority to DE112019007528.4T priority Critical patent/DE112019007528A5/de
Priority to PCT/DE2019/100608 priority patent/WO2021000975A1/fr
Publication of WO2021000975A1 publication Critical patent/WO2021000975A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/03—Stationary work or tool supports
    • B23Q1/035—Stationary work or tool supports with an array of longitudinally movable rods defining a reconfigurable support surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/32—Relative movement obtained by co-operating spherical surfaces, e.g. ball-and-socket joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/08—Work-clamping means other than mechanically-actuated
    • B23Q3/088—Work-clamping means other than mechanically-actuated using vacuum means

Definitions

  • the invention relates to a device for releasably fixing a non-planar or curved surface of a workpiece to be machined.
  • a device for releasably fixing a uniformly curved surface of a panel-shaped workpiece to be processed is known, the workpiece to be processed being a curved laminate sheet.
  • the device known from this publication has a support frame in which a plurality of support struts are exclusively axially displaceably mounted so that they can be brought closer to the curvature of the workpiece.
  • holders for fixing a profile are arranged, on which suction cups are attached, which are connected to a vacuum generating device.
  • the support struts, the brackets, the profile and the suction cups together form a unit for fixing one side of the workpiece to be machined.
  • the invention is based on the object of providing a device which is able to reliably fix even complex geometries of a workpiece in order to simplify its machining overall. In addition, a possibility is to be specified for producing a contour segment for use in such a device inexpensively and in a short time.
  • a device for the detachable fixation of a curved surface of a workpiece to be machined in which the device has several support struts, each with an adapter for attaching a contour segment, has been further developed according to the invention to the effect that the exchangeable contour segment has a contact surface designed to complement the curved surface of the workpiece Is provided.
  • the invention takes a completely new approach, which consists in using workpiece carriers with support struts for clamping a workpiece, which are equipped with a contour segment which is exchangeable and which essentially or completely retains its given shape.
  • the contact geometry of the contour segment corresponds to the complementary shape of the surface section of the workpiece to be fixed.
  • the contour segments can be produced from inexpensive materials such as plastic, elastomer materials or the like, so that you Replacement is easily possible. Since the contour segments have a contact surface that is complementary to the workpiece to be picked up and is consequently adapted to the surface of the workpiece, the workpiece can be optimally supported in this way. The fixation is consequently also possible on geometries that are very complex and, for example, have transitions or changing structures.
  • the fastening of the contour segment on the adapter of a support strut that receives it is advantageously possible, for example, by a zero point clamping system.
  • Other ways of establishing a connection between the adapter and the contour segment are of course also possible.
  • the density of the individual support struts within the device is adapted to the workpiece to be fixed in the sense of a matrix. In other words, this means that the larger the workpiece or the more uneven the surface to be fixed, the more support struts are used. In this respect, one can speak of a modular system with which complex solutions can also be implemented.
  • a significant improvement in the fixation of the workpieces can be achieved in that the support struts are mounted in the device so that they can be rotated, pivoted and / or their axial length can be changed about their axial longitudinal axis. Due to these diverse adjustment possibilities, the support struts can even be used for workpieces whose surface to be fixed has a wave contour with different dimensions of the individual waves and valleys. Such workpieces were previously only very complex to fix or clamp in a workpiece carrier under difficult conditions.
  • a very advantageous example for implementing the rotation and pivotability of the support struts can be seen in the fact that the support struts mounted in the device have a ball-and-socket joint on their section opposite the contour segment, that is to say the lower section.
  • a ball joint With a ball joint, rotational movements and swivel movements can be carried out in several degrees of freedom implement.
  • the construction of such a ball joint is relatively simple and space-saving, which is of particular importance in a device according to the invention.
  • a further development measure according to the invention is that the ball joints for aligning the support struts can be fixed in a position suitable for fixing the workpiece by means of a pneumatic, hydraulic or electromagnetic clamping mechanism. It is particularly important that no mechanical tensioning mechanisms are used, but that the support struts can be fixed in the desired position as automatically as possible.
  • the support strut has a bearing ball that is pivotably mounted in the ball joint.
  • the bearing ball can be placed on the support struts or formed on the support strut. With the aid of the bearing ball penetrated by the support strut, not only the rotational and pivoting movements of the support struts can be implemented in a simple manner.
  • the support strut is guided through a central, circular cylindrical bore in the bearing ball so that the support strut receives the bearing ball.
  • the bearing ball can also be stored in a bearing shell of the ball joint, but this is not mandatory, when the housing receiving the support strut has a contour that is suitable for receiving the bearing ball.
  • the fixation of the support strut via the ball joint can be improved to a decisive extent if the bearing ball has several slots made in its outer surface. Through the slots present in the outer surface of the bearing ball, the bearing ball can be braced centripetally, that is to say directed towards its geometric center. The effort and energy required for this is relatively low.
  • the workpiece can be fixed in a particularly simple manner with the device according to the invention if the contour segment is part of a vacuum generating device. In other words, the workpiece is sucked in with a negative pressure and in this way is releasably fixed to the contour segments. If “negative pressure” is used in this context, this designation refers to a pressure that is lower than the normal air pressure. A “vacuum” is often used in this context.
  • the contour segment therefore has a suction line which penetrates the contour segment and whose suction opening is located in the contact surface of the contour segment, which is designed to be complementary to the workpiece.
  • the contour segment has elastic properties and consists of a suitable material for this purpose, which can be, for example, the aforementioned plastic or an elastomer material. Foam-like materials also appear suitable for this purpose.
  • a contour seal is integrated into the contact surface of the contour segment, which is designed to be complementary to the workpiece, which the suction openings present in the contact surface encloses, so that thereby a suction surface of the contour segment is formed.
  • the contour seal preferably rests against the surface of the workpiece in the edge area of the contour segment.
  • the contour seal according to an advantageous embodiment of the invention can be designed as a lip profile inserted into a groove-shaped recess of the contour segment, the groove-shaped recess being integrated into the contact surface of the contour segment facing the workpiece.
  • the groove it is possible to design the groove as an L-shaped groove in which a vacuum lip profile is inserted as a contour seal.
  • the adapter also form part of the negative pressure generating device and have a suction line connected to the suction line of the contour segment in a flow-conducting manner. In this way, the negative pressure can be fed via the suction line of the adapter into the contour segment, where it is ultimately used in the manner described above to suck in the workpiece.
  • the flow-conducting connection to the existing suction lines can be implemented, for example, via a suction line connection that forms part of the adapter.
  • the suction line connection is easily accessible, which is particularly advantageous during installation and during maintenance and / or repair work.
  • the support strut is designed to be hollow and the inner cavity of the support strut is designed as a suction line of the vacuum generating device.
  • the hollow support strut has a connection at its end opposite the clamping side, which connection can be used for coupling to the vacuum generating device. In the simplest case, this can be a bore that receives the connection of the negative pressure generating device, for example via a thread introduced into the bore.
  • the contour segment have an adjustment element serving for adjustment on the adapter.
  • the adjusting element can be a cam which engages in a corresponding notch, recess or groove on the adapter when the contour segment is placed on the adapter in the predetermined position.
  • the adjusting element can be a collar which is formed on the underside of the contour segment and, when correctly installed, engages in a matching recess on the adapter.
  • a special feature of the present invention is that the replaceable contour segment made of a metal, a plastic, a metal, a plastic, a plastic, a metal, a plastic, is produced by means of a rapid prototyping process, an injection molding process, a vulcanization process or consists of an elastomer material or a composite material.
  • the specified manufacturing method allows the contour segment to be manufactured inexpensively and in a short time, so that the exchange within the device requires only little working time and is associated with very little effort, in particular with low cost. This enables a high degree of flexibility in production, since the machining of different workpieces can be changed at extremely short notice.
  • Figure 1 a section of a fixed to support struts with contour segments
  • Figure 2 the workpiece shown in Figure 1 looking in the direction of
  • Figure 3 a contour segment as a separate individual part in a three-dimensional view
  • FIG. 4 a contour segment in one cut along the suction line
  • FIG. 5 a structural unit consisting of a support strut, an adapter and a housing that supports the support strut
  • FIG. 6 a device for releasably fixing a to be machined
  • FIG. 1 shows a workpiece 3 with a strongly curved surface 2 to be supported.
  • several support struts 4 each have an adapter 5 at their ends facing the workpiece 3.
  • the adapters 5 serve to connect each with a contour segment 6, the specialty of which is that the contact surface 7 of the contour segments 6 connected to the curved surface 2 of the workpiece 3 has a geometry that is complementary to the corresponding curved surface 2 of the workpiece 3 having.
  • This special way of fixing the Workpiece 3 is required because the curved surface 2 has structures that cannot be fixed, for example, with simple suction cups.
  • contour segments 6, the adapters 5 and the support struts 4 are components of a vacuum generating device, by means of which a vacuum is generated so that the workpiece 3 is sucked in. The details of this are explained in more detail below in connection with the description of FIGS. 3, 4 and 5.
  • the workpiece 3 can be machined on its outer surface 19 opposite the curved surface 2 and in its edge sections, which can be, for example, a machining process, for example machining by a milling process.
  • the support struts 4 are also mounted multidirectionally adjustable in the device 1, not shown here in detail, and can also be rotated and pivoted in several directions, which is made possible by a ball joint on the ends of the support struts 4 opposite the contact plates 5. In FIG. 1, two directions of movement are symbolized by the double arrow A and the double arrow B.
  • FIG. 2 accordingly shows a view of the fixing side of the workpiece 3, that is to say of the curved surface 2. It can also be seen in FIG. 2 that the contour segments 6 have suction openings 12 which are connected to a vacuum generating device in a flow-conducting manner, so that the workpiece 3 the contour segments 6 is sucked.
  • This technical solution enables the workpiece 3 to be detachably fixed within the device 1.
  • contour segment 6 emerges as a separate item in a three-dimensional view.
  • the contour segment has
  • the contour segment 6 via a contact surface 7, the geometry of which is designed to be complementary to the curved surface 2 of the workpiece 3 to be fixed.
  • the contour segment 6 has a suction opening 12 approximately in the middle, via which a flow-guiding connection to a vacuum generating device is created.
  • the suction opening 12 is completely surrounded by a contour seal 13 so that a suction surface 14 is created around the suction opening 12, which ensures reliable fixation of the workpiece 3 on the contour segment 6 due to its areal dimension.
  • the lower side 20 of the contour segment 6 On the opposite side of the contact surface 7 is the lower side 20 of the contour segment 6, which has the special feature that in the example shown an adjusting element 18 is formed on the lower side 20, which in the present case is an extension running in the axial direction of a section of the lateral surface of the contour segment 6 is.
  • the adjusting element 18 engages in a corresponding recess of the adapter 5 receiving the contour segment 6. In this simple way, incorrect assembly of the contour segment 6 can be avoided and at the same time it can be achieved that the workpiece 3 is precisely fixed.
  • FIG. 4 shows a contour segment 6 in a representation cut along its continuous suction line 11.
  • a circumferential, groove-shaped recess 15 with an L-shaped cross-sectional area, into which the contour seal 13 is inserted, is let into the contact surface 7 of the contour segment 6.
  • the contour seal 13 is a vacuum lip profile.
  • the upper end of the suction line 1 1 forms the previously mentioned suction opening 12 of the contour segment 6.
  • this cross-sectional view it can also be seen very clearly that the contact surface
  • FIG. 5 shows a structural unit which consists of a support strut 4, an adapter 5 and a housing 21 which supports the support strut 4.
  • the function of the housing is explained even more clearly in connection with the description of FIG.
  • the support strut 4 is mounted pivotably in the housing 21 by means of a ball joint 8.
  • the ball joint consists of a bearing ball 9 which, viewed in the direction of the support strut 4, has a plurality of slots 10 in its outer surface.
  • the bearing ball 9 can be braced in the centripetal direction through these slots 10, which in the present case is carried out with a compressed air device not shown in FIG.
  • This bracing makes it possible to pivot the support strut 4 within the ball joint 8 and also to move the support strut 4 in the direction of its axial extension, so that the support strut 4 is designed to be adjustable in several directions of movement. This is symbolized in FIG. 5 by the double arrows A and B. In this way, the support strut 4 can be optimally adapted to the course of the curved surface 2 of the workpiece 3.
  • the bearing ball 9 of the ball joint 8 is mounted inside the housing 21, where the compressed air device for fixing the set position of the support strut 4 is also located. At its end on the workpiece side, the support strut 4 has the adapter 5, which in the example shown in FIG.
  • the 5 also has a suction line connection 17, by means of which there is a connection to the negative pressure generating device of the device 1.
  • the negative pressure can be passed on via the suction line 16 of the adapter 5 to the contour segment 6 which is arranged on the adapter 5 and which has the suction line 11 already described for this purpose.
  • the contour segment 6 is not shown in FIG. 5 for reasons of simplicity.
  • a contact surface 22 of the adapter 5, which at the same time forms the top side, serves the fixation of the contour segment 6 on the adapter 5 can take place, for example, via a zero point clamping system.
  • FIG. 6 shows a device 1 for releasably fixing a workpiece 3 to be machined in a three-dimensional view, but without the workpiece for reasons of simplification.
  • the device 1 initially has a support frame 23, which in the present case has a modular construction and is designed like a framework to save weight.
  • the upper end of the support frame 23 is formed by a surface into which numerous recesses 24 are made, the structure of which enables the support struts 4 inserted into the recesses 24 to be pivoted.
  • support struts 4 are not inserted into all of the existing recesses 24. This is related to the fact that the support frame 23 can be used for different workpieces 3.
  • the existing support struts 4 here form a matrix which corresponds to the area of the workpiece 3 to be machined.
  • the support struts 4 are fastened in the support frame 23 by means of their housing 21 and have the adapter 5 and the contour segments 6 on their top side opposite the support frame.
  • Each of the existing contour segments 6 has a geometry of its contact surface 7 that is complementary to the curved surface 2 of the workpiece 3, not shown.
  • the suction surface 14 is defined by the contour seal 13 that is embedded all the way along the edge of the contour segments 6.
  • the workpiece 3 can be placed appropriately on the contour segments 6 in their special arrangement and geometry adapted to the curved surface 2 of the workpiece 3 and then fixed with a vacuum by means of the vacuum generating device. In this way, the workpiece 3 can be machined on the outer surface 19 opposite the curved surface 2 or in its edge regions.
  • REFERENCE CHARACTERISTICS LIST :

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Abstract

L'invention concerne un dispositif (1) permettant de fixer de manière détachable une surface cintrée (2) d'une pièce (3) à usiner, ledit dispositif présentant plusieurs entretoises d'appui (4) dotées chacune d'un adaptateur (5) pour fixer dans chaque cas un segment de contour (6). L'invention se caractérise en ce que le segment de contour (5) remplaçable est muni d'une surface d'appui (7) réalisée de manière complémentaire à la surface (2) cintrée de la pièce (3).
PCT/DE2019/100608 2019-07-01 2019-07-01 Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner WO2021000975A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112019007528.4T DE112019007528A5 (de) 2019-07-01 2019-07-01 Vorrichtung zur lösbaren fixierung einer gekrümmten oberfläche eines zu bearbeitenden werkstücks
PCT/DE2019/100608 WO2021000975A1 (fr) 2019-07-01 2019-07-01 Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2019/100608 WO2021000975A1 (fr) 2019-07-01 2019-07-01 Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner

Publications (1)

Publication Number Publication Date
WO2021000975A1 true WO2021000975A1 (fr) 2021-01-07

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PCT/DE2019/100608 WO2021000975A1 (fr) 2019-07-01 2019-07-01 Dispositif de fixation détachable d'une surface cintrée d'une pièce à usiner

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DE (1) DE112019007528A5 (fr)
WO (1) WO2021000975A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113070651A (zh) * 2021-03-26 2021-07-06 中国船舶重工集团公司第七二五研究所 大型钛及钛合金曲面构件的机加工工艺方法
CN113523972A (zh) * 2021-08-11 2021-10-22 佛山市南海豪迪卫浴有限公司 一种淋浴房玻璃裁切成型精磨处理机械
DE102021121962A1 (de) 2021-08-25 2023-03-02 Bayer Gmbh & Co Kg Verfahren zur außenseitigen Qualitätskontrolle von Bauteilen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB120697A (en) 1917-10-10 1918-11-11 Pilkington Brothers Ltd Improvements in or relating to Apparatus for Grinding and/or Polishing Plate Glass.
DE1903576A1 (de) 1969-01-24 1970-08-27 Ver Flugtechnische Werke Verfahren zur konstruktiven Entwicklung eines Fixierund Spannsystems fuer mechanisch zu bearbeitende Werkstuecke,z.B.auf einer Werkzeugmaschine,und Vorrichtung zur Ausfuehrung
EP0069230A2 (fr) 1981-07-07 1983-01-12 Messerschmitt-Bölkow-Blohm Gesellschaft mit beschränkter Haftung Méthode de serrage de pièces et dispositif de réalisation
DE19828779A1 (de) * 1998-06-27 1999-12-30 Carpentier Gmbh & Co Kg Aufnahme für Formteile
DE20306263U1 (de) * 2003-04-17 2003-08-07 Hackenfort Guenter Werkstückhalter
US20070020065A1 (en) * 2005-07-25 2007-01-25 Kirby Larry D Workpiece holding apparatus
DE10230270B4 (de) 2001-07-06 2009-05-07 M. Torres Diseños Industriales, S.A., Torres de Elorz Flexibles System zur Herstellung von Konstruktionen
WO2013083900A1 (fr) * 2011-12-08 2013-06-13 Forest Line Capdenac Dispositif de maintien d'un panneau courbe par verins et moyens de succion
WO2013153413A1 (fr) * 2012-04-12 2013-10-17 Lipoczi Gergely Système modulaire pour produire des prototypes et des moules

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB120697A (en) 1917-10-10 1918-11-11 Pilkington Brothers Ltd Improvements in or relating to Apparatus for Grinding and/or Polishing Plate Glass.
DE1903576A1 (de) 1969-01-24 1970-08-27 Ver Flugtechnische Werke Verfahren zur konstruktiven Entwicklung eines Fixierund Spannsystems fuer mechanisch zu bearbeitende Werkstuecke,z.B.auf einer Werkzeugmaschine,und Vorrichtung zur Ausfuehrung
US3681834A (en) 1969-01-24 1972-08-08 Ver Flugtechnische Werke Method and apparatus for fabricating workholders
EP0069230A2 (fr) 1981-07-07 1983-01-12 Messerschmitt-Bölkow-Blohm Gesellschaft mit beschränkter Haftung Méthode de serrage de pièces et dispositif de réalisation
DE19828779A1 (de) * 1998-06-27 1999-12-30 Carpentier Gmbh & Co Kg Aufnahme für Formteile
DE10230270B4 (de) 2001-07-06 2009-05-07 M. Torres Diseños Industriales, S.A., Torres de Elorz Flexibles System zur Herstellung von Konstruktionen
DE20306263U1 (de) * 2003-04-17 2003-08-07 Hackenfort Guenter Werkstückhalter
US20070020065A1 (en) * 2005-07-25 2007-01-25 Kirby Larry D Workpiece holding apparatus
WO2013083900A1 (fr) * 2011-12-08 2013-06-13 Forest Line Capdenac Dispositif de maintien d'un panneau courbe par verins et moyens de succion
WO2013153413A1 (fr) * 2012-04-12 2013-10-17 Lipoczi Gergely Système modulaire pour produire des prototypes et des moules

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113070651A (zh) * 2021-03-26 2021-07-06 中国船舶重工集团公司第七二五研究所 大型钛及钛合金曲面构件的机加工工艺方法
CN113070651B (zh) * 2021-03-26 2023-03-24 中国船舶重工集团公司第七二五研究所 大型钛及钛合金曲面构件的机加工工艺方法
CN113523972A (zh) * 2021-08-11 2021-10-22 佛山市南海豪迪卫浴有限公司 一种淋浴房玻璃裁切成型精磨处理机械
CN113523972B (zh) * 2021-08-11 2022-05-27 佛山市有为科技有限公司 一种淋浴房玻璃裁切成型精磨处理机械
DE102021121962A1 (de) 2021-08-25 2023-03-02 Bayer Gmbh & Co Kg Verfahren zur außenseitigen Qualitätskontrolle von Bauteilen

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