EP2490837A2 - Outil thermorégulé - Google Patents

Outil thermorégulé

Info

Publication number
EP2490837A2
EP2490837A2 EP11795217A EP11795217A EP2490837A2 EP 2490837 A2 EP2490837 A2 EP 2490837A2 EP 11795217 A EP11795217 A EP 11795217A EP 11795217 A EP11795217 A EP 11795217A EP 2490837 A2 EP2490837 A2 EP 2490837A2
Authority
EP
European Patent Office
Prior art keywords
tool
elements
plate
tool part
heating device
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11795217A
Other languages
German (de)
English (en)
Inventor
Dieter BÖHME
Martin Heckmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GIW Verwaltungs- und Vertriebs GmbH
Original Assignee
GIW Verwaltungs- und Vertriebs GmbH
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 GIW Verwaltungs- und Vertriebs GmbH filed Critical GIW Verwaltungs- und Vertriebs GmbH
Publication of EP2490837A2 publication Critical patent/EP2490837A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling

Definitions

  • the invention relates to a tempered tool for forming sheet metal, with an upper tool and a tool lower part, wherein the tool parts according to the desired contour of the sheet complementarily formed active surfaces for forming the sheet and can be executed one or more parts, wherein at least one heating device for Temperature control of the upper die and / or Maschinenbauteil is provided, which is integrated into the respective tool part between a tool body and the active surface defining member, and wherein the heater is all around, with the exception of the active surfaces, substantially thermally insulated.
  • Tempered tools of the generic type are well known in practice. There are, for example, the warm forging with tempered tools, in particular the hot forging of aluminum sheets and the tempered deformation of magnesium sheets.
  • the use of tempered tools has proved to be advantageous, since the deformability of corresponding materials is favored by the influence of temperature.
  • the heating of the tool is used regularly to bring the lying on the blank holder areas of the sheet to be deformed to process temperature. It should be noted that the heating of the sheet is not necessarily limited to the areas on the blank holder, although the punch and die are heated or when the holding time of the board in the tool is so long that the sheet is completely heated. If a board heated outside the tool is used, the tool heating serves to maintain the process temperature in the sheet and thus to ensure process stability.
  • the elevated temperature is to be conveyed to the workpiece to be formed, it is necessary to protect the mechanical parts from temperature. So it is necessary in conventional tools and forming equipment, the head, base and pressure plate - as well as possible - against the heated
  • Head, base, pressure plate and blank holder hydraulics are mentioned here only by way of example. Ultimately, it is so far the non-tempered tool elements, z. B. bearings, guides or hydraulic devices record, and the tool carrying the press, etc.
  • the present invention is therefore based on the object to provide a tempered tool of the generic type with an integrated heater, in which a heat transfer between the elements of the heater and the non-tempered elements of the tool or the machine is largely avoided, with a secure positioning of the Elements of the heater is ensured, but at the same time the best possible heat transfer from the heater is achieved on the tool-active surfaces.
  • the heating device comprises at least two parts extending outside the tool part , thermally non-insulated centering elements, the interact with non-tempered outer Zentrierblöcken such that in the non-tempered state of the tool part game and at full operating temperature little or no clearance is available.
  • the heater is basically stated that this consists of a hot plate, the heating elements, elements for temperature detection and a control or regulation.
  • the heating plate can be made in one or more parts. It can be spatially curved and need not have a concrete or constant thickness. It may include the tool in whole or in part (zonal). It can be divided into several heating or control zones, which can be tempered independently.
  • the heating plate takes up the heating elements. Heating elements are z. B. electro-resistive type (cartridge heaters and tubular heaters of various types), inductive type (induction coils) or magnetic type (magnetic coils). Furthermore, they can be designed in the form of grooves, bores or channels, which are charged with a heat transfer fluid.
  • the temperature of the hot plate can, for. B. be detected by thermocouples to monitor the temperature, follow-up or return to a closed loop. In any case, the heating device serves to temper the tool-active surfaces.
  • a floating centering or guiding of the heating device or of the heating elements of the heating device can be realized, whereby an exact - play-free - positioning or centering of the heating device is achieved upon reaching the operating temperature.
  • the centering of the heaters relative to the outer Zentrierblöcken are designed such that due to the thermal expansion on reaching the operating temperature, the game is reduced or even excluded, so that a hundred percent centering is reached in the operating state.
  • the invention is thus based on the finding that the heating plate expands when heated, namely due to the specific expansion coefficient.
  • the tool body remains at ambient temperature.
  • a firm connection between the heating device or the heater belonging to the heating plate and the base body is not possible, namely due to the expansion of the heating plate.
  • the solution to the underlying problem is, in principle, the "floating" guidance to the fixed centering, and accordingly the heater is provided with at least two centering elements extending outside the heating plate of the tool part, which are guided against the outwardly disposed centering blocks it is ultimately about a substantially radial leadership.
  • the externally arranged Zentrierblöcke are firmly connected to the body.
  • the heating plate can expand thermally in all directions-predominantly radially-but remains globally centered.
  • the contact surface between the centering elements and the centering blocks is as small as possible, at least in comparison to the volume and the surface of the centering blocks. Due to such a design, the heating of the Zentrierblöcke - at least over the actual operating time away - be neglected.
  • the initial guide game is designed so that it is zero or nearly zero when reaching the operating temperature of the heater.
  • the teaching of the invention can also be applied to tools that are operated at changing operating temperatures.
  • the adjustment of the game can be done by means of tuning plates using screws.
  • a game setting with printing elements for example by means of gas springs, possible.
  • the above measures can be ideally combined with each other.
  • the heater is carried out in an advantageous manner as an electrically operating heating plate, wherein such an electrical design is not mandatory.
  • Essential is the task of the heater, namely the temperature of the tool-active surfaces.
  • the centering elements can be integral parts of the heating plate.
  • the heating plate is arranged such that a heat transfer between the elements of the heating device and the non-tempered elements of the tool or the machine is largely avoided.
  • the heating plate between a base or top plate and the active surface defining component, the actual tool, integrated the involvement can in turn be done in the context of a sandwich-like structure.
  • the heating plate is preferably between at least one insulating plate or a protective plate and one or more removable plates and is held there accordingly or braced against it.
  • the sandwich-like arrangement of the removable disks is realized by a kind of quick-change system, wherein the quick-change system preferably holds the sandwich-like arrangement together by means of clamps.
  • the quick-change system favors the quick replacement of the removable disks.
  • thermal insulation elements can be provided between the heating device and the tool base body, wherein these comprise very special insulating plates.
  • the thermal insulation is favored by very special insulating, in which a plate-like steel mesh is provided as a base body, in which so-called insulating stones are used.
  • a cooling in particular a forced-air cooling
  • component frame is meant more or less the vertical area of the component to be drawn with the tool.
  • nitrogen or another technical gas can also serve as a coolant
  • the purpose of the frame cooling is the cooling of the hot flowing from the blank holder into the drawing gap sheet material.
  • the sandwich structure of the heater or the heating plate with insulation, etc. where all those elements that are positioned near or directly to the heated elements are made of materials with high temperature resistance. These include the previously mentioned insulating stones.
  • the sandwich structure is further characterized in that the components remote from the heater have increasing thermal resistance as the distance from the heater increases. This is especially true for the insulation provided there.
  • thermal insulation is primarily used to a homogeneous temperature distribution to the Wirk Gardner. To achieve active surfaces.
  • the required energy input must be limited.
  • active cooling for example air or water cooling, may be provided for the thermal decoupling of the tempered elements from the non-tempered tool elements and the press, although it is possible by means of suitable sandwich technology and insulation plates provided there to take the complex precautions of active cooling to replace.
  • the previously mentioned insulating bricks are used advantageously in a flame-cut steel mesh, which serves to position and guide the insulating bricks. The positioning should prevent tilting or shifting of the stones.
  • the subsequent to the sandwich-like structure of the heater and the thermal insulation carrier plate is made of steel and is used for the homogenization of the temperature field.
  • an external insulation is provided, which is provided for thermal insulation of the heater or the heated elements of the heater, namely an outer insulation, which acts against the environment.
  • the outer insulation reduces the heat loss of the outer areas of the tempered tool elements by convection and radiation to the environment. This supports a homogeneous temperature distribution of the active surfaces. Otherwise, the active surface temperature in the outdoor area would fall below that of the areas further in the interior.
  • the die of the tool or the one and / or the other tool half may preferably be optionally cooled with air or water.
  • the lower part may comprise a compressed air cooling for the frame provided there. It is conceivable that this is installed in the upper part, in the lower part or in the stamp or as a separate tool element, e.g. in the form of a revolving counter punch, is formed.
  • the provision of a so-called protective sheet which acts between the heater and the other insulating elements, such as the insulating bricks.
  • the object of the protective sheet lies in the uniform, impact-edge-free power transmission to the insulating stones.
  • the forces are both compressive forces during forming and shear forces due to the expansion and shrinkage of the heating plate during heating or cooling.
  • the heating plate provided there may be electrically heated with heating cartridges and tubular heaters, wherein the process heat is transferred directly or indirectly to the removable disks.
  • the exchangeable plates form the actual active surface, namely the so-called tool-active surface, both in the blank holder and in the die.
  • Thermocouples can be installed for temperature detection in the heating plate and / or removable disk.
  • the sandwich-type construction is also applicable in particular for heating curved surfaces and in modified form / design.
  • the active surfaces usually result from segments, which can - at least theoretically - realize any component sizes.
  • segments are usually screwed from the direction of the body against the same and pinned to avoid a disruptive interruption of the tool-active surfaces.
  • a change of segments so far requires an expansion, a turning operation and extensive disassembly of the entire tool. This is extremely time consuming and usually problematic in handling.
  • the tool according to the invention makes it possible to use a quick-change system for the segmented exchangeable plates.
  • the exchangeable plates are exchangeable with little effort, for example when worn or for the purpose of comparative investigations with differently coated exchangeable plates and their effects on the deformation result or the surface quality of the deformed metal sheet.
  • screw connections of the exchangeable plates can be operated from the direction of the tool-active surfaces, specifically in the outer region of the plate holder and the die, in which no metal sheet comes to rest. Any necessary interruption of the surface thus has no influence on the forming process and the quality of the part to be manufactured.
  • clamps are used, which are firmly bolted to the heating plates. With the help of these brackets, the removable plates against the heating plates - or vice versa - clamped.
  • FIG. 1 is a schematic side view of an embodiment of a tool according to the invention.
  • FIG. 2 shows the article from FIG. 1 in section along the line A-A, FIG.
  • Fig. 3 is a schematic plan view of a steel grid for receiving
  • FIG. 4 is a schematic plan view of the centering of a heating plate of
  • Fig. 5 in a schematic view, compared with FIG. 4 increases, the game setting by means of tuning plates and
  • Fig. 6 in a schematic view, compared to Fig. 4 enlarged, the game setting by means of pressure elements, here by means of gas pressure springs.
  • Fig. 1 shows a schematic side view of the basic structure of a tempered tool comprising an upper tool part 1 and a lower tool part 2. The tool is used for forming sheets.
  • the tool parts 1, 2 are designed to be complementary according to the desired contour of the sheet and comprise corresponding effective surfaces for forming the sheet. In addition, the tool parts 1, 2 executed in several parts.
  • both the upper tool part 1 and the lower tool part 2 comprises a heating device 3, 4, in the respective tool part 1, 2 between a base body (head plate 5 at the upper tool part 1 and pressure plate 2a at the lower tool part 2) and the component defining the active surface (Here several removable plates 7 are provided) is integrated.
  • the heater is substantially thermally insulated all around except for the active surfaces.
  • the heating device 3 or 4 comprises at least two centering elements 8 extending to the outside of the tool part 1, 2, namely not thermally insulated, with a total of four centering elements 8 in the embodiment shown in FIG
  • the centering elements 8 interact with outer centering blocks 10 such that in the non-tempered state of the tool part 1 and / or 2 game and at full operating temperature of the heater 3, 4 little or no play is available.
  • a heating device 3, 4 is realized with heating plates 9, which is guided or centered in a floating manner.
  • Fig. 1 shows the basic structure of a tempered tool according to the foregoing.
  • the upper tool part 1 comprises a top plate 5, to which an insulating plate 11 connects. Thereafter follows a further insulating plate 12.
  • the insulating plate 12 follows a carrier plate 13.
  • further thermal insulation means are provided which comprise a steel grid 14.
  • insulating stones 15 are used in the steel grid 14 so-called insulating stones 15 are used.
  • the insulating stones 15 is followed Schonblech 16 on. This is followed immediately by the heating plate 9, against which the removable plates 7 with their active surface 17.
  • the lower tool part 2 is constructed accordingly. Specifically, the tool is based lower part 2 on a base plate 6, to which a blank holder hydraulic 18 is connected. Also on the base plate 6 is supported a punch 19, which protrudes through a recess in the lower tool part 2 and fits into the die-like upper part 1 formed. Otherwise, the lower tool part 2 comprises the same sandwich-like structure as the tool upper part 1 described above.
  • Fig. 2 shows the article of Fig. 1 in section along the line A-A, where also there the sandwich-like structure can be seen.
  • Fig. 2 additionally shows the provision of a compressed air cooling 20 for the component frame.
  • Fig. 2 shows hinted the screw 21 of the removable plates with the hot plate in the outer area of blank holder and die and a lateral clip quick change system 22 for replacing the removable plates 7.
  • the heating plate 9 remains in the tool.
  • the support plate 13 is made of solid steel and is used for homogenization of the resulting temperature field.
  • An outer insulation is not shown in Figs. 1 and 2.
  • the outer insulation is identified by reference numeral 23 and shown schematically. In any case, a thermal insulation from the environment is realized by the outer insulation 23.
  • the indicated in Figs. 1 and 2 punch 19 may optionally be cooled, preferably with water.
  • a cooling for example, a compressed air cooling 20 or cooling with a different technical gas is provided as the cooling medium, which serves to cool the component frame.
  • the protective sheet 16 it should be noted that this causes a uniform and shock-free power transmission to the insulating stones 15, wherein the protective sheet can be made of solid material.
  • the forces are both compression forces during forming and shear forces due to the expansion and shrinkage of the heating plate during heating or cooling.
  • the heating plate 9 is part of the heater 4 and is electrically heated with heating cartridges and tubular heaters 24. Any other type of heating is conceivable.
  • the heating plate 9 transfers the process heat to the removable plates 7, which in turn comprise the active surfaces 17.
  • the removable plates 7 form the actual tool-active surface, each in sheet metal holder and die.
  • the entire sandwich-like structure can be divided into two or divided several times. In case of a bipartition, the two halves are tilted against each other and against the horizontal plane. This ensures that the heating plates better follow the contours of the active surfaces to be heated. The thickness and thus also the mass and the thermal inertia of the tempered elements is reduced. The same applies to heating-up times of the tool and reaction times of the control.
  • a multiple division of the sandwich construction is particularly suitable for complex contours and is feasible in the light of the teaching of the invention.
  • FIG. 4 in the plan view selected there is a recess 25 in the sense of a punch / Matrizurchbruch, depending on whether this is the heating plate 9 of the upper tool part 1 or the lower tool part 2.
  • FIG. 2 indicates that a quick-change system is realized for the segmented exchangeable plates 7.
  • the removable plates 7 can be replaced, for example, in the case of wear or for the purpose of comparative studies of removable disks with different surfaces.
  • the screw connection 21 realized there can be operated from the direction of the tool-active surfaces, specifically in the outer area of the sheet metal holder and the die. In this area, no sheet comes to rest, so there is no obstruction. Consequently, an interruption of the surface has no influence on the forming process.
  • brackets 22 are provided which are bolted to the heating plate 9. The brackets 22 clamp the removable plates 7 against the heating plate. 9
  • the "floating guide or centering" of the heating plate 9 takes account of a very special situation, since the heating plate 9 expands when heated, whereas the respective one Consequently, it is necessary to avoid a firm connection between the heating plate 9 and the main body. For the same reason, a guide of the heating plate 9 is eliminated with respect to the punch 19. Consequently, here, according to the invention
  • the centering elements 8 already discussed above are provided, which are guided against outer centering blocks 10 Centering blocks 10 are firmly connected to the respective base body. According to this embodiment, the heating plate 9 can thermally expand in all directions, but remains centered overall.
  • the centering elements 8 act with respect to the centering elements 10 with the lowest possible contact surface, in any case in comparison to the volume and the surface of the centering blocks 10.
  • the heating of the centering blocks 10 can be neglected.
  • the guide clearance is so designed taking into account the thermal expansion coefficient of the Schwarzplattenmaterials that it is zero or almost zero when the operating temperature of the heating plate 9 is reached. Consequently, the heating plate 9 is fixed at the operating temperature in the fully centered state. Upon cooling, in turn, play arises and a relative movement of the volume reducing heating plate 9 with respect to the other components is possible.
  • FIGS. 5 and 6 show adjustable guides, which are in any case expedient when the tool is operated at varying operating temperatures.
  • a clearance adjustment with tuning plates 26 using screws 27 is provided.
  • Fig. 6 shows the game setting with special printing elements, here - symbolically - gas springs 28 are shown.
  • the solutions of FIGS. 5 and 6 can be combined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

L'invention concerne un outil thermorégulé destiné au façonnage de tôles et comportant une partie supérieure (1) et une partie inférieure (2), ces parties d'outil (1,2) comportant des surfaces actives (17) de formes complémentaires pour façonner la tôle en fonction du contour désiré de la tôle et pouvant se présenter en une ou plusieurs parties. Au moins un dispositif chauffant destiné à thermoréguler la partie supérieure de l'outil (1) et/ou la partie inférieure de l'outil (2) est intégré dans la partie d'outil (1,2) correspondante entre un corps de base d'outil et l'élément définissant la surface active (17), le dispositif chauffant étant sensiblement thermiquement isolé sur son pourtour à l'exception de la zone faisant face aux surfaces actives (17). L'invention est caractérisée en ce que le dispositif chauffant comporte au moins deux éléments de centrage thermiquement non isolés et s'étendant vers l'extérieur de la partie d'outil, ces éléments de centrage coopérant avec des blocs de centrage (10) extérieurs non thermorégulés de manière à créer un jeu lorsque la partie d'outil (1,2) n'est pas thermorégulée, ce jeu étant faible ou inexistant à température de fonctionnement maximale.
EP11795217A 2010-06-16 2011-06-16 Outil thermorégulé Withdrawn EP2490837A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010023912 2010-06-16
DE201010033816 DE102010033816A1 (de) 2010-06-16 2010-08-09 Temperiertes Werkzeug
PCT/DE2011/001362 WO2011157266A2 (fr) 2010-06-16 2011-06-16 Outil thermorégulé

Publications (1)

Publication Number Publication Date
EP2490837A2 true EP2490837A2 (fr) 2012-08-29

Family

ID=45091322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11795217A Withdrawn EP2490837A2 (fr) 2010-06-16 2011-06-16 Outil thermorégulé

Country Status (3)

Country Link
EP (1) EP2490837A2 (fr)
DE (1) DE102010033816A1 (fr)
WO (1) WO2011157266A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110649C5 (de) 2012-11-07 2018-03-01 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils
DE102012110650C5 (de) * 2012-11-07 2017-12-14 Benteler Automobiltechnik Gmbh Warmformlinie zur Herstellung warmumgeformter und pressgehärteter Stahlblechprodukte
DE102014006763A1 (de) 2014-05-08 2015-02-26 Daimler Ag Vorrichtung zum Erwärmen eines Leichtmetallbauteils
DE102018000371B4 (de) 2018-01-18 2019-12-19 Audi Ag Presswerkzeug zur Bearbeitung eines Blechbauteils und Verfahren zu dessen Herstellung
TR202011405A1 (tr) * 2020-07-17 2022-01-21 Tusas Tuerk Havacilik Ve Uzay Sanayii Anonim Sirketi Bir levha şekillendirme sistemi.
CN114751633B (zh) * 2022-05-06 2023-06-09 广东华中科技大学工业技术研究院 一种大尺寸超薄玻璃构件热弯成型装置及其成型方法

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DE871991C (de) * 1942-12-29 1953-03-26 Fritz Werner Ag Verfahren zum Kuehlen von Stanz-, Press- und Abscherwerkzeugen waehrend des Arbeitsvorganges
US3605477A (en) * 1968-02-02 1971-09-20 Arne H Carlson Precision forming of titanium alloys and the like by use of induction heating
JP2549625B2 (ja) * 1986-05-19 1996-10-30 株式会社東芝 カラ−受像管用シヤドウマスクの温間成形装置
JP2988056B2 (ja) * 1991-10-09 1999-12-06 松下電器産業株式会社 プレス金型
DE102006015793C5 (de) * 2006-04-05 2009-02-12 Peter Dr.-Ing. Amborn Umformwerkzeug zum Umformen von Hohlkörpern oder Blechen mit Hilfe eines druckbeaufschlagten Gases oder Fluides

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Title
See references of WO2011157266A2 *

Also Published As

Publication number Publication date
WO2011157266A3 (fr) 2012-04-19
DE102010033816A1 (de) 2011-12-22
WO2011157266A2 (fr) 2011-12-22

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