EP2986444A1 - Outil d'usinage thermique de composants - Google Patents

Outil d'usinage thermique de composants

Info

Publication number
EP2986444A1
EP2986444A1 EP14722089.1A EP14722089A EP2986444A1 EP 2986444 A1 EP2986444 A1 EP 2986444A1 EP 14722089 A EP14722089 A EP 14722089A EP 2986444 A1 EP2986444 A1 EP 2986444A1
Authority
EP
European Patent Office
Prior art keywords
cover layer
machining tool
support structure
cooling
tool according
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Withdrawn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
EP14722089.1A
Other languages
German (de)
English (en)
Inventor
Matti Reppe
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.)
Qpoint Composite GmbH
Original Assignee
Qpoint Composite 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 Qpoint Composite GmbH filed Critical Qpoint Composite GmbH
Publication of EP2986444A1 publication Critical patent/EP2986444A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/062—Press plates
    • B30B15/064—Press plates with heating or cooling means

Definitions

  • the invention relates to an electrically heatable machining tool for the thermal processing of components, for. B. for use for thermal prototyping, forming or joining of components.
  • a thermal treatment i. H. a heat input
  • a component to be machined In many manufacturing processes, a thermal treatment, i. H. a heat input, in a component to be machined. So it is z. It is known, for example, to provide heated and / or cooled metal tools in the press in pressing processes, or alternatively to use unheated metal tools in a heated and / or cooled press.
  • DE 10 2004 042 422 A1 discloses a molding tool having a fiber composite structure with a plastic matrix in which an electrical resistance heating element is embedded. Further describes
  • WO 2008/067809 A2 a molding tool having a fiber composite structure and an electrical resistance heating element, wherein the arrangement forming the resistance heating element is formed in the form of biaxial or multi-axial fabrics or carbon fiber layers.
  • the above-mentioned heatable metallic molds are associated with high acquisition and operating costs. In addition, they have due to their high mass and heat capacity on a correspondingly high energy consumption and high thermal inertia, which is associated with correspondingly large cycle times.
  • Such metallic molds can be equipped with a cooling in addition to the heating to allow faster cooling of the machined components. Due to the good thermal conductivity of metals, metallic molds allow a relatively homogeneous temperature control of the components to be machined even with inhomogeneous temperature input, however, both during heating and during cooling, a large part of the energy used for tempering the mold is required and thus goes to tempering lost the component.
  • Molded fiber composite materials are associated with lower costs and can be designed with lower mass, heat capacity and thermal conductivity, however, the known fiber composite molds do not permit (active) cooling, which adversely affects, inter alia, cycle times (heat-up cooling cycle).
  • the invention has for its object to provide a cost-effective, stable machining tool for the thermal processing of components, by means of which short cycle times are made possible with low energy consumption.
  • a machining tool for the thermal processing of components -. B. for thermal prototyping, forming or joining eg., Bonding of two components by means of heat input
  • the machining tool can thus z. B. act as a mold, in particular as a pressing tool, or as a joining tool.
  • the machining tool has a front cover layer with an electrical resistance heating element for heating the cover layer.
  • the top layer can z. B. be a cover layer of fiber-reinforced plastic material, wherein an electrical resistance heating element is embedded in the plastic material or in the top layer.
  • the cover layer may also have or be a metallic cover plate (eg made of a thin sheet metal) which is provided with a resistance heating element.
  • the cover layer has a front side provided for contacting a component to be processed and a rear side remote from the same.
  • the top layer can z. B. in the form of a flat plate, but may also have a different shape and will generally have a three-dimensional shape.
  • a support structure of fiber-reinforced plastic material is arranged, wherein the support structure is profiled alternately or alternately with bulges arched away from the back and arched out indentations and arranged so that by means of the bulges as cooling channels functioning channels are formed, the run along the back of the top layer.
  • the support structure is, so to speak, shaped like a corrugated sheet (ie, the support structure has the form of a folded or corrugated plate), whereby the transverse cut and the arrangement of the formed cooling channels are defined by the waveform of the support structure.
  • the support structure is arranged (along the indentations) contacting the cover layer back, z. B. glued to the same.
  • the machining tool can also have a support structure.
  • the support structure is formed by a support material filling or indenting the indentations of the support structure.
  • the support material is preferably a thermally insulating material.
  • the support material may, for. B. a (cured) epoxy resin or an educated by means of an epoxy resin, the z to increase its thermal insulation.
  • B. a filler material may be added from a thermally insulating material.
  • the filling material may be a lumpy or granular material, for. For example, glass beads may be provided as filling material.
  • the mechanical stability and the dimensional stability of the machining tool are mainly determined by the support structure, which also serves to transfer occurring pressure and shear forces as well as for the spatial separation of the hot and the cold tool side from each other.
  • the support structure back-filling or supporting support structure the stability of the machining tool can be additionally increased, wherein the support structure also acts as a thermal insulation.
  • a cooling fluid flows through the cooling channels during the cooling step, and during the heating step, the cooling channels are not flowed through (but evacuated or with a stationary, non-flowing - and, for example, thermally insulating - fluid are filled).
  • the cooling fluid may be a gaseous medium (eg, compressed air) or a liquid medium (eg, water).
  • the cooling channels between a weggewölbten from the top layer back section are formed and thus the cooling fluid is in direct contact with the cover layer, is also an effective heat dissipation made possible even with a poor heat conductive cover layer.
  • the cooling fluid flow is interrupted and the cooling channels are thus not flowed through during the heating of the component to be thermally processed by a cooling fluid, the channel cavities can act as a thermal insulation during heating, so that the supplied heating energy substantially for tempering the components to be machined is available and only a small proportion of energy is lost for heating the machining tool.
  • the support structure made of thermally insulating material can additionally have an insulating effect and thus minimize a heat flow running between the back or unheated side of the machining tool and the heatable cover layer, whereby the required energy expenditure is reduced even further during the heating as well as during the cooling and a homogeneous temperature distribution over the top layer away is possible.
  • the machining tool allows a rapid heating and cooling of the top layer (and consequently correspondingly low cycle times) with a homogeneous temperature distribution with low energy consumption.
  • the machining tool consists at least partially of fiber-reinforced plastic material, the machining tool can be provided inexpensively and with a low weight, wherein by means of the support structure in connection with the support structure nevertheless a high stability is ensured.
  • the cover layer may consist of fiber-reinforced plastic material, for. B. made of carbon fiber reinforced plastic and / or glass fiber reinforced plastic. However, it can also be provided that the cover layer has a metallic cover plate.
  • the electrical resistance heating element may, for. B. one or more metallic heartssSchabête, z. B. Resistance heating, have or from den- exist same.
  • the electrical resistance heating element may also comprise one or more carbon fiber resistance heating sections, e.g. B. comprise one or morelvessSchstr brieflye of carbon fibers, or consist of the same.
  • Such a heating element can, for. B. from a carbon fiber roving roving, wherein the roving z. B. may consist of unidirectional carbon fibers.
  • the resistance heating element can have one or more strand-shaped resistance heating sections (eg, metallic resistance heating wires or resistance heating strands consisting of carbon fibers) that form a meandering manner along the cover layer, or consist of the same.
  • the resistance heating element (or its sections) is electrically insulated by surrounding electrically insulating regions, except for connection sections provided for connecting the resistance heating element to an electrical voltage source.
  • the resistance heating z. B. be electrically insulated by surrounding electrically insulating portions of the fiber composite structure. Such electrically insulating areas may, for. B. be formed by glass fiber reinforced plastic material.
  • the support structure is also made of fiber reinforced plastic material, for. B. made of carbon fiber reinforced plastic and / or glass fiber reinforced plastic.
  • the shape and dimensions of the cooling channels are defined by the wave profile of the support structure. Accordingly, the shape and the dimensions of the cooling channels can be adapted to a respective requirement profile by appropriate design of the wave profile of the support structure.
  • the support structure is formed such that the cooling channels have a trapezoidal cross-section; wherein the longer of the two mutually parallel bases of the trapezoid is given by the boundary portion formed by the cover layer back of the respective cooling channel and the channel thus has a widening in the direction towards the cover layer in cross-section.
  • the cooling channels can z. B. be formed such that its cross section has the shape of an isosceles, symmetrical trapezoid, wherein the longer of the two parallel bases of the trapezium is formed by the top layer.
  • the cooling channels are formed with a trapezoidal, widening in the direction of the cover layer cross-section, a large contact surface between the interior of the cooling channels and the cover layer is possible, whereby during heating effective thermal insulation of the cover layer and during cooling effective heat dissipation of the cover layer is possible.
  • a high stability of the support structure and the support structure - and thus also of the machining tool - against acting on the front of the cover layer pressure loading allows by means of the resulting, curved trapezoidal to the cover layer indentations, which is particularly advantageous when using the machining tool as a pressing tool.
  • the support structure is formed such that the cooling channels have a rectangular cross-section.
  • This can be z. B. be provided in applications where a lower stability of the machining tool is sufficient.
  • a rectangular channel cross-section with respect to a trapezoidal channel cross-section allows a larger flow cross-section and thus also a larger volume flow of the cooling fluid for the same contact surface between the interior of a cooling channel and the cover layer.
  • the flow cross-section of the cooling channels has a different shape than a trapezoidal or rectangular shape.
  • the support structure and the cooling channels are preferably designed such that the contact surface at which the support structure contacts the cover layer back side is not greater than 30%, in particular not greater than 15%, of the total surface of the cover layer back side.
  • the processing tool may further comprise an unheated base layer or rear cover layer, which is arranged in contact with the support structure, for. B. is laminated to the support structure.
  • the base layer has symmetry reasons, preferably the same geometry as the cover layer and z. B. made of fiber-reinforced plastic material, for. B. from the same fiber-reinforced plastic material as the heated front cover layer.
  • the machining tool has a cooling device which is designed such that a cooling fluid (for example compressed air, oil or water) can be passed from it through the cooling channels.
  • a cooling fluid for example compressed air, oil or water
  • the heating step may, for. For example, a temperature raising portion during which a temperature rise to a predetermined heating temperature, and a constant temperature portion, during which the temperature is kept constant at the predetermined heating temperature have.
  • the cooling device may be configured such that no cooling fluid is passed through it by the cooling channels during the heating step, i. h .. the cooling channels are not flowed through during the heating step of the cooling fluid.
  • the cooling fluid flow interrupted and / or the cooling fluid discharged from the channels.
  • the cooling device may be configured such that during the cooling step, the cooling fluid is passed through the cooling channels, so that the cooling channels are flowed through by the cooling fluid.
  • the machining tool according to the embodiments described above, z. B. a mold, in particular a pressing tool to be.
  • the mold can in particular for primary forming or forming of components of thermally influenced materials, eg. As plastics or fiber composites may be provided.
  • 1 is a sectional view of a machining tool according to an embodiment
  • FIG. 2 is an illustration of the arrangement of a resistance heating element
  • FIG. 3 is a sectional view of a machining tool according to another embodiment.
  • FIG. 1 shows a processing tool 1 according to an embodiment in a sectional representation.
  • the machining tool 1 is a molding tool 1, here by way of example a pressing tool 1.
  • the pressing tool 1 has a front cover layer 3 of fiber-reinforced plastic material, wherein an electrical resistance heating element 5 is embedded in the cover layer 3 and the cover layer 3 is thus heatable.
  • the cover layer 3 has a front side 7 and a rear side 9, wherein the front side 7 is provided for contacting the component to be molded (not shown) and thus forms the shaping surface of the molding tool 1.
  • the top layer 3 is shown as a flat plate, but the top layer can be made with any three-dimensional shape.
  • the electrical resistance heating element 5 consists of a roving or bundle of carbon fibers, the bundle being arranged in a meandering manner along the shaping front side 7 of the cover 3 (see FIG. 2).
  • the cover layer 3 is made of carbon fiber reinforced plastic, wherein the resistance heating element 5 by means of the same surrounding areas of fiberglass reinforced reinforced plastic (not shown) is electrically isolated from the surrounding carbon fiber reinforced plastic.
  • the molding tool 1 further has a contact structure arranged on the back side 9 of the cover layer 3.
  • the support structure 11 is made of carbon fiber reinforced plastic and has a corrugated sheet-like shape with trapezoidal wave crests and wave troughs, wherein the support structure 11 alternately with away from the backsheet 9 rear troughs or bulges 13 and the cover layer back 9 dished wave crests or indentations 15th profiled.
  • 13 cooling channels 17 are formed by means of the bulges.
  • the channels 17 are bounded by the bulges 15 of the support structure 3 and the cover side reserve 9 and extend with their longitudinal direction along the cover layer 9 back side, d. H. according to Figure 1 along the y-direction of the illustrated xyz Koordinatenatensaystems.
  • the molding tool 1 also has a support structure 19.
  • the supporting structure 19 is formed by a (hardened) epoxy resin which backfills the indentations 15 of the supporting structure 3 and is mixed with glass beads as thermally insulating filling material.
  • the mold 1 has a rear base layer 21 which is laminated onto the support structure 19.
  • the rear base layer 21 is made of carbon fiber reinforced plastic and corresponds in size to those of the front cover layer 3.
  • the base layer 21 also of the support structure 11, in particular of the bulges 13 of the support structure 11, contacted and bonded to the same.
  • Each of the cooling channels 17 has a flow cross-section in the form of an isosceles, symmetrical trapezoid, wherein the longer of the two parallel bases of the trapezoid on the cover layer 3 and the shorter of the two parallel bases of the trapezoid on the base layer 21 is arranged.
  • the ratio of the contact surface at which the support structure 11 contacts the cover layer rear side 9 is approximately 15% of the total area of the cover layer rear side 9.
  • FIG. 2 illustrates a plane parallel to the xy plane, ie parallel to the cover layer.
  • the carbon fiber bundle 5 acting as a resistance heating element 5 is arranged meandering along the cover layer in such a way that it permits a planar temperature control of the cover layer 3.
  • the resistance heating element 5 has two contact terminals 23 protruding from the cover layer 3, wherein the resistance heating element 5 can be activated by applying an electric voltage to the two contact terminals 23.
  • the molding tool 1 according to FIGS. 1 and 2 also has a cooling device (not shown), which is designed to pass through compressed air through the cooling channels 17 as compressed air serving as cooling fluid.
  • a heating step is first carried out by means of the molding tool 1 by applying an electrical voltage between the two contact terminals 23 of the resistance heating element 5 and thus heating the cover layer 3.
  • a cooling step is carried out by means of the cooling device by passing the cooling fluid through the cooling channels 17 (ie entering the cooling channels 17 at one longitudinal end, flowing through them along the y-direction and at the other longitudinal end of the cooling channels emerges from the same). During the heating step, no cooling fluid is passed through the cooling channels.
  • FIG. 3 illustrates a machining tool 1 according to a further embodiment.
  • the embodiment according to FIG. 3 differs from that according to FIGS. 1 and 2 only in that it can be replaced by a corresponding design of the support structure 11 with cooling channels 17 having a rectangular cross-section is trained.
  • the cover layer front side is separated (ie wetted with a release agent). Thereafter, the component to be molded is brought into contact with the top layer front side, z. B. placed on the top layer front side. Now, the pressing tool is acted upon by the predetermined process pressure and the heating is switched on (ie, the heating element embedded in the cover layer is subjected to an electrical voltage). The component is cured in the form defined by the cover layer front mold, then the heater is turned off and the cooling channels are flowed through by a cooling fluid. Finally, the machined component is removed from the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un outil (1) d'usinage thermique de composants. L'outil d'usinage comprend une couche de recouvrement (3), qui contient une résistance chauffante électrique (5) servant à chauffer la couche de recouvrement (3), et une structure porteuse (11) en matériau synthétique renforcé de fibres disposée en contact avec la face arrière de la couche de recouvrement. Cette structure porteuse (11) possède un profil constitué d'une alternance de saillies (13) dont la convexité est orientée à l'opposé de la face arrière et de creux (15) dont la convexité est orientée en direction de ladite face arrière, de sorte que les saillies (13) forment des conduits de refroidissement (17) qui s'étendent le long de la face arrière.
EP14722089.1A 2013-04-15 2014-03-27 Outil d'usinage thermique de composants Withdrawn EP2986444A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013103749 2013-04-15
DE102013105401.3A DE102013105401B4 (de) 2013-04-15 2013-05-27 Bearbeitungswerkzeug zum thermischen Bearbeiten von Bauteilen
PCT/DE2014/100103 WO2014169898A1 (fr) 2013-04-15 2014-03-27 Outil d'usinage thermique de composants

Publications (1)

Publication Number Publication Date
EP2986444A1 true EP2986444A1 (fr) 2016-02-24

Family

ID=51618257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14722089.1A Withdrawn EP2986444A1 (fr) 2013-04-15 2014-03-27 Outil d'usinage thermique de composants

Country Status (3)

Country Link
EP (1) EP2986444A1 (fr)
DE (1) DE102013105401B4 (fr)
WO (1) WO2014169898A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3065905B1 (fr) * 2017-05-03 2020-11-27 Commissariat Energie Atomique Presse pour l'assemblage d'une pile a combustible
IT201900003939A1 (it) * 2019-03-19 2020-09-19 Ormamacchine S P A Piano riscaldato perfezionato per presse a piano riscaldato.
DE102019123950A1 (de) * 2019-09-06 2021-03-11 Deutsches Zentrum für Luft- und Raumfahrt e.V. Werkzeugvorrichtung mit einer Heizmatte sowie Reparaturverfahren und Herstellverfahren für Werkstücke aus Kunststoffmaterial

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DE3017559C2 (de) * 1980-05-08 1984-07-05 Gottfried Joos Maschinenfabrik GmbH & Co, 7293 Pfalzgrafenweiler Beheizungs- und Kühlelement
DE3807081C1 (en) * 1988-03-04 1989-03-16 Nilos Gmbh Foerderband-Ausruestung, 4010 Hilden, De Process and apparatus for controlling the heating surface temperature of a pressing plate for vulcanising conveyor belts
DE4116324A1 (de) 1991-05-16 1992-11-19 Presatex Gmbh Verfahren zum pressen und presse
CA2103882A1 (fr) * 1993-08-11 1995-02-12 Peter J. Prihoda Methode et appareil pour faconner le bois
CA2204497A1 (fr) * 1994-11-04 1996-05-17 Andrew James Wytkin Dispositif de moulage a plusieurs couches et procede associe
DE102004042422A1 (de) 2004-09-02 2006-03-23 Deutsches Zentrum für Luft- und Raumfahrt e.V. Beheizbares Formwerkzeug für die Herstellung von Bauteilen aus Faserverbundstoffen
DE102006058198C5 (de) 2006-12-07 2018-01-18 Fibretemp Gmbh & Co. Kg Elektrisch beheizbares Formwerkzeug in Kunststoffbauweise
US8357325B2 (en) * 2008-12-10 2013-01-22 General Electric Company Moulds with integrated heating and methods of making the same
CN201357532Y (zh) * 2009-03-13 2009-12-09 苏州红枫风电模具有限公司 模具电加热和空气冷却系统
DK2357069T3 (da) * 2010-02-15 2013-01-02 Siemens Ag Støbeform, apparat og fremgangsmåde til fremstilling af en kompositdel indeholdende mindst en fiberforstærket matrix

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Also Published As

Publication number Publication date
DE102013105401B4 (de) 2019-01-24
WO2014169898A1 (fr) 2014-10-23
DE102013105401A1 (de) 2014-10-16

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