WO2017148997A1 - Noyau de moule à matériau expansible - Google Patents

Noyau de moule à matériau expansible Download PDF

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Publication number
WO2017148997A1
WO2017148997A1 PCT/EP2017/054739 EP2017054739W WO2017148997A1 WO 2017148997 A1 WO2017148997 A1 WO 2017148997A1 EP 2017054739 W EP2017054739 W EP 2017054739W WO 2017148997 A1 WO2017148997 A1 WO 2017148997A1
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WO
WIPO (PCT)
Prior art keywords
expansion material
core
mold
expansion
support core
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.)
Ceased
Application number
PCT/EP2017/054739
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German (de)
English (en)
Inventor
Michael Wilhelm
Hans Lochner
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.)
KTM Technologies GmbH
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KTM Technologies GmbH
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Filing date
Publication date
Application filed by KTM Technologies GmbH filed Critical KTM Technologies GmbH
Publication of WO2017148997A1 publication Critical patent/WO2017148997A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
    • B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
    • B29C33/505—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
    • B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames

Definitions

  • the present invention relates to a mandrel for producing a fiber-reinforced component, in particular a, preferably having a structure, undercut and / or hollow component, with a support core, which defines a basic shape of the mandrel, and with a disposed in at least one surface region of the support core coating, which comprises an expansion material which expands at a temperature increase, so that in the manufacture of the component reinforcing fibers can be pressed to an inner side of a molding tool. Furthermore, the invention relates to a production method for such a mold core for producing a fiber-reinforced component, in particular a, preferably having a structure, undercut and / or hollow component, in which a support core is coated at least in a surface region.
  • the invention also relates to a method for producing a fiber-reinforced component, in particular a, preferably having a structure, undercut and / or hollow component, in which a mandrel and a matrix with reinforcing fibers are introduced into a mold, so that the matrix with the Reinforcing fibers are arranged between the mandrel and the mold, and the matrix is cured by means of a temperature and / or pressure increase.
  • a mold core for molding fiber-reinforced structural hollow components comprises a support core, which is formed by a solid granules and a water-soluble binder for binding the granules.
  • the water-soluble binder is formed by a water-soluble thermoplastic and the support core is at least partially surrounded by a cladding layer.
  • a disadvantage of such a mandrel is that the mandrel has substantially the size of a cavity of a mold, in which the hollow structural member is formed. This leads to problems when introducing the mold core in the mold.
  • the mold core can be pinched when clamping the mold or clamped between the mold halves. This can lead to a scrap or at least errors in the structural hollow components. The same problem can occur not only in hollow components, but also in undercut components, in particular structural intersection components.
  • Object of the present invention is thus to eliminate this disadvantage.
  • the object is achieved by a mold core for producing a component, in particular a, preferably having a structure, undercut and / or hollow component, a manufacturing method for the mandrel and a method for producing the fiber-reinforced component having the features of the independent claims.
  • a mold core for producing a fiber-reinforced component, in particular one, preferably having a structure, undercut and / or hollow component.
  • the component is thus preferably a structural hollow component and / or a structural rear-cut component.
  • the mold core comprises a support core. This preferably gives a basic shape of the mold core.
  • the mold core comprises a coating arranged in at least one surface area.
  • the coating of the mold core comprises an expansion material which expands when the temperature increases.
  • the reinforcing fibers applied during manufacture are disposed over the expansion material.
  • the expansion material thus presses the reinforcing fibers outwardly from the mandrel and presses them against the inside of the mandrel so that the reinforcing fibers assume the contour of the inside during the manufacture of the component, in particular the undercut and / or hollow component.
  • the expansion material extends from the surface area of the support core. going at least partially, preferably completely, into its interior. In this way, advantageously, the expansion effect and the stability of the mandrel can be improved.
  • the mold core hereby not so age-sensitive, so that it can be stored much longer without sacrificing quality.
  • the mold core can be made smaller than the mold by the expansion material in terms of its volume and / or dimensions. That When the mold core is disposed in the mold, a gap is formed between them. During the temperature increase, the expansion material expands at least to the extent that the gap between the mold core and mold is compensated and additionally exerts an expansion pressure, which presses the reinforcing fibers to the inside of the mold. The expansion material thereby increases its volume by the expansion volume. The expansion volume is the difference in volume of the expansion material after and before expansion. Due to the smaller design of the mandrel compared to the mold, the mandrel can be inserted without damage in the mold. In addition, a pinching during the closing of the mold is prevented.
  • the support core is formed from a support material comprising a binder and / or granules.
  • the granulate comprises in particular a mineral base material, such as a glass, a ceramic and / or a sand.
  • the granules with the binder can have a porosity, so that intermediate spaces are formed between the granules and / or the binder.
  • the expansion material is disposed at least in a part of the interstices of porosity. The intermediate spaces thus serve as storage for the expansion material.
  • the granules comprise a large number of granules.
  • the granules in particular the grains of sand, the glass particles and / or the ceramic particles, for example, have a particle size of 0.05 mm to 1, 5 mm.
  • the particle size may be dependent on the porosity. For example, if the granules are larger, the gaps and thus the porosity are larger. This allows more expansion material to be stored in the interstices. With a choice of the size of the granules can thus be discussed on the stored in the spaces amount of expansion material.
  • the granules and / or the binder is advantageously temperature-resistant, so that the granules and / or the binder is not decomposed during the temperature increase during the formation of the component.
  • the granules and / or the binder in comparison to the expansion material has a low coefficient of thermal expansion, so that the granules and / or binder in the temperature increase only slightly, at least in comparison to the expansion material expands.
  • the support core is completely enclosed by the expansion material. Thereby, the expansion effect on the entire surface of the support core can be achieved.
  • the expansion material extends at least partially from the surface in the direction of a core region of the support core.
  • the support core can also be completely impregnated by the expansion material.
  • the support core is completely traversed by the expansion material, so that the entire support core is formed in full volume, ie in the scope of its entire volume, from a material comprising the granules, the binder and the expansion material. As a result, a larger amount of expansion material of received the support core, so that its expansion volume is greater.
  • the support core is produced in a rapid prototyping method, in particular in a 3D ducking method, and / or that in the rapid prototyping method the expansion material is applied to and / or into the support core in addition to the binder. and / or introduced.
  • the mandrel can be produced very quickly and inexpensively.
  • its production is not localized. Instead, for example, geometry and / or composition data of the mold core, in particular virtually, can be sent to a customer, who can then manufacture the mold core on-site at his own rapid prototyping device, in particular a 3D printer.
  • the expansion material comprises a wax, a silicone, a plastic, a fat and / or a low-melting alloy.
  • the expansion material comprises a sugar and / or a salt.
  • the plastic may preferably be formed as an elastomer.
  • Such an expansion material has a temperature increase such a thermal expansion coefficient that the distance between the mold core and mold is overcome.
  • the volume expansion coefficient of the expansion material is in the range between 0.5 * 1 Oe-3 1 / K and 1, 5 * 1 Oe-3 1 / K.
  • the above-mentioned coefficient of thermal expansion of the support material is smaller than a coefficient of thermal expansion of the expansion material.
  • the coefficient of thermal expansion of the expansion material may be 20 to 30 times higher than the thermal expansion coefficient of the support material.
  • the thermal expansion coefficient of the expansion material may also, in particular maximum, be 150 times higher.
  • a granulate may have a volume expansion coefficient ranging from 1, 0 * 10e-6 1 / K to 30 * 1 Oe-6 1 / K.
  • a further advantageous development of the invention is when the expansion material, a first additive is added, which increases the expansion pressure in the temperature increase.
  • the first additive may comprise, for example, a physical and / or a chemical blowing agent, in particular water, which also expands when the temperature increases.
  • the physical blowing agent for example, changes its state of aggregation as the temperature increases, for example, allowing it to evaporate to increase the expansion pressure.
  • a chemical blowing agent chemically transforms into other substances. For example, a gas forms, so that the expansion pressure is increased.
  • the expansion material may be admixed with a second additive, by means of which the beginning of the expansion of the expansion material in dependence on the temperature and / or pressure is controllable.
  • the second additive may include, for example, an alcohol.
  • the mold core has on its outer side, at least in the region of the expansion material, a separating layer which seals the mold core to the outside and which adapts to the expansion of the expansion material.
  • the separating layer may advantageously be elastic, so that the separating layer expands with the expansion of the expansion material.
  • the separating layer may in particular comprise an elastomer.
  • the elastomer may comprise a silicone and / or plastic layer.
  • the separating layer seals the mold core and especially the expansion material.
  • the mold core can thereby be stored, for example, wherein the release layer protects the expansion layer and the support core from wear.
  • the separating layer can also be used for the subsequent production of the component, in particular the undercut and / or hollow construction. partly, be beneficial.
  • the separating layer for example, ensures a smooth surface of the mold core.
  • the expansion material repels matrix material, in particular is resin-repellent, so that it does not mix with the matrix during the production of the component.
  • the binder, the expansion material, the first additive, the second additive and / or the separating layer are soluble by means of a solvent.
  • a solvent may include, for example, water and / or an alcohol.
  • the solvent may also include acids and / or bases.
  • the solvent must be chosen such that it dissolves the binder, the expansion material, the additives and / or the release layer.
  • the mold core has a cavity which is empty or at least partially filled with the expansion material, by means of which a release of the mold core can be accelerated.
  • the cavity reduces on the one hand the weight of the mold core and on the other hand, in the cavity, a flushing device can be introduced for releasing the mold core, so that the release of the mold core is accelerated.
  • the mandrel is thus flushed from the inside out over the cavity through the Aus Domainvorraum or dissolved.
  • a manufacturing method for a mandrel for producing a fiber-reinforced component in particular a, preferably having a structure, undercut and / or hollow component.
  • a support core is coated with an expansion material at least in a surface area.
  • the mandrel is produced according to and / or with the features of the preceding description, wherein said features may be present individually or in any combination.
  • the support core is produced by means of a rapid prototyping method, in particular with an SD printing method.
  • the support core can be produced particularly cost-effectively and quickly.
  • the expansion material is also applied to and / or introduced into the support core (2) in the rapid prototyping method.
  • the geometry of the support core and its expansion properties can be formed in a single process step, so that the mold core can be produced very quickly and inexpensively.
  • its production is not localized. Instead, for example, geometry and / or composition data of the mold core, in particular virtually, can be sent to a customer, who can then manufacture the mold core on-site at his own rapid prototyping device, in particular a 3D printer.
  • the expansion material is applied to the support core by immersion in a bath of expansion material.
  • the support core can preferably be immersed in the bath at least until the support core is at least 20% soaked with expansion material.
  • the support core may also remain so immersed in the bath until it is substantially complete, for example, 75%. 100% of its volume impregnated with expansion material.
  • the expansion material can be applied very easily and quickly.
  • dipping the expansion material can also be applied particularly uniformly on the support core, so that the expansion material uniformly expands at all points of the surface.
  • the expansion material may also be brushed onto the support core and / or sprayed on. As a result, the expansion material can be applied to the support core in selected sections of the surface.
  • the support core and / or expansion material is heated before the expansion material is applied to and / or into the support core.
  • the support core can be heated to a temperature which depends on the viscosity and / or of the
  • a method for producing a fiber-reinforced component in particular a, preferably having a structure, undercut and / or hollow component.
  • the component can in particular be a structural hollow component and / or a structural rear-cut component.
  • a mandrel and a matrix with reinforcing fibers are introduced into a mold, so that the matrix with the reinforcing fibers between the mandrel and the mold are arranged.
  • the matrix is cured by means of a temperature and / or pressure increase, wherein the expansion of temperature expands an expansion material of the mold core, so that the volume of the mold core is increased and the reinforcing fibers are pressed against an inner side of the mold.
  • a mandrel is used description, wherein said features may be present individually or in any combination.
  • the molding tool can have two molding tool halves that are opened for insertion of the mold core and closed to produce the component. After production, the finished component can be removed again by opening from the mold.
  • the molding tool has a cavity in which the mold core is arranged. Between the mold core and the mold while the reinforcing fibers and the matrix are arranged.
  • the mold has an inner side, against which the reinforcing fibers, in particular by the expansion of the expansion material, are pressed, so that the component, in particular the, preferably having a structure, undercut and / or hollow member, the shape of the inside of the mold accepts.
  • the mandrel can be provided only with the reinforcing fibers and then inserted into the mold.
  • the matrix can be pressed in.
  • the reinforcing fibers can be inserted first in the mold and then the mold core in the reinforcing fibers.
  • the reinforcing fibers can already be provided with the matrix or the matrix can be pressed into the mold again during the production process.
  • the reinforcing fibers may also already be preimpregnated with the matrix, this composite also being called a prepreg. These prepregs are placed on the mold core, which is then inserted into the mold.
  • the component in particular the, preferably having a structure, undercut and / or hollow component
  • the thus prepared mandrel is inserted into a mold.
  • the mold can be dimensioned slightly larger than the mold core, so that between mold core and mold still a gap may be formed.
  • the insertion of the mold core is simplified in the mold.
  • the molding tool further has an inner side, which defines an outer contour of the component, in particular of the undercut and / or hollow component, which preferably has a structure.
  • the reinforcing fibers are pressed against the inside of the mold so that they assume the shape of the inside.
  • the reinforcing fibers are subjected to a liquid matrix which hardens during the production of the component, in particular the undercut and / or hollow component, preferably having a structure, so that it forms a fiber composite with the reinforcing fibers.
  • the matrix may also be applied to the mandrel together with the reinforcing fibers.
  • the component in particular the undercut and / or hollow component, constructed and forms the supporting structure. An interaction of the mold core and the inside of the mold determines the shape or the appearance of the fiber-reinforced component, in particular of the undercut and / or hollow component.
  • the curing of the matrix is preferably carried out at temperatures of 70 ° C to 250 ° C and pressures of 2 bar to 150 bar. After a period of, for example, 15 seconds to 10 minutes, the curing may be completed.
  • the mold core is cooled before insertion into the mold.
  • the mandrel and, in particular, special the expansion material together, so that the mandrel can be particularly easily inserted into the mold.
  • the matrix is cured so that the fiber-reinforced component obtains its strength.
  • the temperature is increased to, for example, 70 ° C to 250 ° C, so that the matrix hardens and forms the fiber composite together with the reinforcing fibers. This temperature is maintained for a period of time until the cure is complete.
  • the increase in temperature leads to the expansion of the existing on the surface and / or in the interstices of the mold core expansion material. Due to the volume expansion coefficient described above (in the range of 0.5 * 1 Oe-3 1 / K and 1, 5 * 1 Oe-3 1 / K) its volume increases by the expansion volume.
  • the expansion volume is the difference of the volume at a final temperature, for example 250 ° C, and the initial temperature, for example, the room temperature of 20 ° C.
  • the expansion material pushes the arranged on the outside reinforcing fibers to the outside and presses them against the inside of the mold.
  • the temperature is maintained for some time, for example 15 seconds to 10 minutes, for example, 250 ° C, so that the matrix hardens and forms the fiber composite with the reinforcing fibers.
  • the pressure and / or the temperature prevailing in the molding tool can be reduced slowly, for example over a period of 30 seconds to 30 minutes, in order to control a distortion of the fiber composite or to minimize the delay.
  • the finished component can be removed from the mold.
  • the reinforcing fibers may comprise various fibers such as basalt, glass, ceramic, aramid, carbon and / or nylon fibers.
  • various thermoplastics and / or thermosets such as epoxy resins or plastics may be used.
  • the mold core is triggered by means of a solvent from the component.
  • the release of the mold core can be carried out, for example, by injecting the solvent into the cavity.
  • the solvent may further comprise an acid, a base, water and / or an alcohol.
  • FIG. 1 shows a sectional view of a mold core
  • Figure 2 shows a section of a surface of the mandrel with granules, binder, expansion material and release layer and
  • FIG 3 shows a mold core in a mold.
  • FIG. 1 shows a sectional view of a mold core 1.
  • the mandrel 1 comprises a support core 2.
  • an expansion material 3 is arranged in a surface region 4 of the support core 2.
  • the mandrel 1 is for producing a component, in particular one, preferably having a structure, undercut and / or hollow component, is provided, which is formed in the present embodiment, in particular for the production of a tubular fiber-reinforced structural hollow component. Since the mandrel 1 determines the shape of the component at least roughly, the mandrel 1 in In the present embodiment, a cylindrical shape.
  • the expansion material 3 is applied according to the present embodiment only on the lateral surface of the support core 2, whereas the end faces 5a, 5b are not provided with the expansion material. As a result, the tubular shape is formed in the production of the structural hollow component. Alternatively, however, the expansion material 3 could also be arranged on the end faces 5a, 5b as well.
  • FIG. 2 shows a detailed detail in the region of the surface of a mold core 1, in particular of the mold core 1 according to FIG. 1.
  • the mold core 1 is provided for producing the fiber-reinforced component, in particular the, preferably having a structure, undercut and / or hollow component.
  • the support core 2 is formed from a support material comprising a granulate and a binder 7.
  • the granulate comprises a plurality of granules 6, of which only one is provided with a reference numeral for the sake of clarity.
  • the individual granules 6 are connected to each other by means of the binder 7.
  • the granules 6 may be formed from a mineral base material.
  • the granules 6 may be, for example, grains of sand.
  • the size of the granules 6 may be between 0.05 mm and 1.5 mm. Furthermore, these may have different sizes to each other.
  • the granules 6 are further enclosed by the binder 7. At the contact points 1 1 between the individual granules 6, bridges or splices form, so that the granules 6 form a solid lattice structure.
  • the support core 2 can - in particular, if this is constructed as in the present case of granules 6 and binder 7, be prepared by means of a rapid prototyping process, in particular a 3D printing process.
  • the granules 6 on the one hand are substantially round and on the other hand have different sizes, between the granules nern 6 spaces 8 formed. Due to the gaps 8, the support core 2 is formed porous. In these spaces 8, the expansion material 3 can penetrate, so that they serve as expansion material storage.
  • the expansion material 3 when the expansion material 3 is applied by impregnating the support core 2 in an expansion material bath, it is advantageous if the expansion material 3 and / or the support core 2 is heated prior to coating, in particular impregnation, of the support core 2.
  • the support core 2 can be heated to a temperature that depends on the viscosity and / or the melting point of the expansion material 3. As a result, the viscosity of the expansion material 3 decreases and it can penetrate into the support core 2 faster and / or deeper.
  • the expansion material 3 can, as mentioned above, for example, be applied by immersing the support core 2 in a bath of expansion material 3. Additionally or alternatively, the expansion material 3 can also be painted on the support core 2 and / or sprayed.
  • the expansion material 3 in the rapid prototyping method is applied to and / or into the support core 2.
  • the support core 2 in the rapid prototyping method not only from the granules, in particular the granules 6, and the binder 7 is constructed, but in addition also from the expansion material 3.
  • rapid prototyping method is thus at least in part of the Gaps 8 and / or the surface area 4 expansion material 3 introduced. In this way, the geometry of the support core 2 and its expansion properties can be formed in a single process step, so that the mandrel 1 can be produced very quickly and inexpensively. Furthermore, its production is not localized.
  • geometry and / or composition data of the mold core 1 can be provided to a customer. be sent, who can then make the mold core 1 on site at his own rapid prototyping device, in particular a 3D printer.
  • the support core 2 is provided according to a first embodiment on its outer surface or in the surface region 4 with the expansion material 3.
  • the expansion material 3 extends at least partially into the interior of the support core 2, starting from the surface region 4 of the support core 2. Dis can be done as part of the rapid prototyping process or else by capillary action.
  • the support core 2 may be completely enclosed by the expansion material 3.
  • the support core 2 can only be in its edge area, i. in the surface region 4 and at least partially in its interior adjacent thereto, be provided with the expansion material 3.
  • the support core 2 may be completely penetrated with the expansion material 3.
  • the support core 2 has the expansion material 3 over its entire cross-section. The entire support core 2 is thus formed in full volume from a granule 6, the binder 7 and the expansion material 3 comprising material unit.
  • the surface region 4, in particular the lateral surface closes off the support core 2 to the outside.
  • the coating of the mold core 1 or the expansion material 3 is arranged.
  • the expansion material 3 may also advantageously, as shown in this embodiment, be arranged in a surface layer 10 over the lateral surface or on the support core 2.
  • the surface layer 10 may have a thickness in the range of 0.5 mm and 10 mm.
  • a release layer 9 may be arranged, which closes the mold core 1 to the outside.
  • the separating layer 9 may comprise an elastomer and / or be formed, for example, as a silicone and / or plastic layer.
  • the separating layer 9 can be elastic, so that it expands correspondingly upon expansion of the expansion material 3.
  • the separation layer 9 and the expansion material 3 have mutually different material compositions.
  • the release layer 9 can be sprayed, brushed or applied by immersion in a bath of the appropriate material.
  • the separating layer 9 serves to protect the mandrel 1 from damage. With the release layer 9, the mandrel 1 can be stored for a long time.
  • the separating layer 9 prevents the expansion material 3 from being pressed between the fibers, in particular carbon fibers, and / or the matrix of the fiber composite material of the component to be produced during the production of the component, in particular the undercut and / or hollow component which preferably has a structure becomes.
  • the separating layer 9 thus ensures a reliable separation between the mold core 1 and externally arranged fiber composite material.
  • the expansion material 3 is matrix material-repellent, in particular resin-repellent. As a result, a separation between matrix and expansion material 3 can be ensured.
  • FIG. 3 shows a mold core 1 and a mold 12.
  • the mold core 1 has the already described support core 2 and the expansion material 3.
  • the expansion material 3 is arranged according to illustration only on the outside of the support core 2. However, the expansion material 3 can also, as shown in FIG. 2, be arranged at least partially in the porosity of the support core 2.
  • a separating layer 9 (cf., FIG. 2), not shown here, can be applied to the expansion material 3.
  • On the expansion ma- Rial 3 and the separating layer 9 are arranged reinforcing fibers 13. With these, the mandrel 1 can be wrapped before insertion into the mold 12.
  • the reinforcing fibers 13 form a fiber composite with a matrix, not shown here, so that a component, in particular an undercut and / or hollow component, preferably having a structure, is formed.
  • the mold core 1 is further arranged in the mold 12, which for example comprise two halves, so that the mold 12 can be easily opened and closed.
  • the molding tool 12 also has a cavity 18, in which the mold core 1 is arranged.
  • the mold core 1 also has a smaller size than the cavity 18, so that a gap 14 is formed between an inner side 19 of the mold 12 and the mold core 1.
  • the mold core 1 can be introduced into the mold 12 particularly easily. Furthermore, a squeezing of the reinforcing fibers 13 between the two halves of the molding tool 12 is thereby avoided when closing the mold 12.
  • the reinforcing fibers 13 may, for example, be placed on the mandrel 1 before it is inserted into the mold 12. Likewise, so-called prepregs can be placed on the mandrel 1 before inserting. Prepregs are reinforcing fibers 13 which are already preimpregnated with a matrix.
  • the reinforcing fibers 13 could also first be inserted into the mold 12, after which the mold core 1 is inserted into the mold 12 or into the reinforcing fibers 13 only thereafter.
  • the matrix can then be pressed in with a closed mold 12 and when the reinforcing fibers 13 are arranged around the mold core 1 therein.
  • the matrix is then advantageously not shown here Positions pressed into the mold 12 so that the matrix passes directly between mold core 1 and mold 12 in the gap 14 (where the reinforcing fibers 13 are arranged) passes.
  • an increase in temperature, for example from 20 ° C. to 250 ° C., of the mold core 1 and / or of the mold 12 is carried out the expansion material 3 expands and exerts an expansion pressure 15 on the reinforcing fibers 13.
  • the expansion material 3 pushes the reinforcing fibers 13 outwardly away from the mandrel 1.
  • the expansion material 3 is expanded so far until the gap 14 is overcome, the reinforcing fibers 13 are pressed against the inner side 19 of the mold 12.
  • the matrix furthermore hardens and combines with the reinforcing fibers 13 to form the fiber composite, which forms the component, in particular the undercut and / or hollow component, preferably having a structure.
  • the mold 12 may be opened (by, for example, pulling the two halves apart) and the component may be removed. It is advantageous if the cooling time is selected such that a delay of the cooling component is reduced. For example, the component is slowly cooled, so that stress and thus a distortion of the component is reduced. The delay can also be reduced if the pressure prevailing in the mold is slowly reduced.
  • the weight of the component is increased.
  • the supporting material in particular the granules, the binder, the added during the manufacturing process additives
  • a flushing device can be inserted through an opening 17 of the mandrel 1 in a cavity 1 6 of the mandrel 1.
  • the flushing device By means of the flushing device, the mold core 1 can then be dissolved in its components and rinsed out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulding By Coating Moulds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un noyau de moule pour la fabrication d'une pièce renforcée de fibres, en particulier d'une pièce en contredépouille et/ou creuse, comprenant un noyau support (2), qui spécifie une forme de base du noyau de moule (1), et un revêtement appliqué dans au moins une zone superficielle (4). Selon l'invention, le revêtement comprend un matériau expansible (3) qui, lorsque la température augmente, se dilate de telle sorte que, lors de la fabrication de la pièce, des fibres de renfort (13) peuvent être comprimées contre une face interne (19) d'un moule (12).
PCT/EP2017/054739 2016-03-04 2017-03-01 Noyau de moule à matériau expansible Ceased WO2017148997A1 (fr)

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CN108773090A (zh) * 2018-05-18 2018-11-09 航天特种材料及工艺技术研究所 气体膨胀成型方法
EP3785874A1 (fr) 2019-08-30 2021-03-03 Ktm Ag Procédé de fabrication d'un réservoir de matière consommable pour l'exploitation
CN113696499A (zh) * 2021-08-26 2021-11-26 航天特种材料及工艺技术研究所 一种拼装防变形轻量化碳纤维复合材料框架制备方法

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DE102017131201A1 (de) * 2017-12-22 2019-06-27 Airbus Operations Gmbh Werkzeug zur Verwendung bei einer Konsolidierung eines faserverstärkten Bauteils

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GB842815A (en) * 1957-11-08 1960-07-27 Goodyear Aircraft Corp Method of making laminated hollow shapes
US4292101A (en) * 1979-03-05 1981-09-29 Reichert James B Method of fabricating composite members
FR2760398A1 (fr) * 1997-03-06 1998-09-11 Snecma Procede de realisation de pieces creuses de precision en materiau composite
WO2008003733A1 (fr) * 2006-07-06 2008-01-10 Airbus Deutschland Gmbh Procédé et noyau de moulage pour fabriquer un composant de composite fibreux pour l'aviation et la navigation spatiale et composant de composite fibreux obtenu de cette façon
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WO2010069084A1 (fr) * 2008-12-16 2010-06-24 Ruag Aerospace Ag Procédé de fabrication d'un corps creux rigide en matériau composite
WO2014099841A1 (fr) * 2012-12-17 2014-06-26 General Electric Company Mandrin extensible et procédé de fabrication de structures composites creuses
DE102013106876A1 (de) 2013-07-01 2015-01-08 C.F. Maier GmbH & Co. KG Formkern und Verfahren zum Herstellen von faserverstärkten Strukturhohlbauteilen

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Publication number Priority date Publication date Assignee Title
CN108673915A (zh) * 2018-05-18 2018-10-19 航天特种材料及工艺技术研究所 气体膨胀成型模具
CN108773090A (zh) * 2018-05-18 2018-11-09 航天特种材料及工艺技术研究所 气体膨胀成型方法
EP3785874A1 (fr) 2019-08-30 2021-03-03 Ktm Ag Procédé de fabrication d'un réservoir de matière consommable pour l'exploitation
CN113696499A (zh) * 2021-08-26 2021-11-26 航天特种材料及工艺技术研究所 一种拼装防变形轻量化碳纤维复合材料框架制备方法
CN113696499B (zh) * 2021-08-26 2023-09-15 航天特种材料及工艺技术研究所 一种拼装防变形轻量化碳纤维复合材料框架制备方法

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