EP4460416A1 - Surmoulage d'un élément en matériau polymère thermodurcissable - Google Patents
Surmoulage d'un élément en matériau polymère thermodurcissableInfo
- Publication number
- EP4460416A1 EP4460416A1 EP23700384.3A EP23700384A EP4460416A1 EP 4460416 A1 EP4460416 A1 EP 4460416A1 EP 23700384 A EP23700384 A EP 23700384A EP 4460416 A1 EP4460416 A1 EP 4460416A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- resin
- cavity
- robotic arm
- interface
- 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.)
- Pending
Links
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/07—Injection moulding apparatus using movable injection units
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
- B29C45/14418—Sealing means between mould and article
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1756—Handling of moulds or mould parts, e.g. mould exchanging means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1773—Means for adjusting or displacing the injection unit into different positions, e.g. for co-operating with different moulds
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
- B29C2045/14139—Positioning or centering articles in the mould positioning inserts having a part extending into a positioning cavity outside the mould cavity
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
- B29C2045/2671—Resin exit gates or bleeder passages
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/64—Mould opening, closing or clamping devices
- B29C2045/645—Mould opening, closing or clamping devices using magnetic means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7613—Measuring, controlling or regulating the termination of flow of material into the mould
Definitions
- the present invention relates to the production of ancillary elements in synthetic material, in particular in thermosetting polymer material, on a support.
- the ancillary element may be made of thermosetting polymer material.
- the present invention meets these needs by proposing a method for producing an ancillary element on a part, in particular to functionalize it, in particular a part made of composite material comprising a matrix of thermosetting polymer material, the method comprising the following steps: a ) positioning, using a robotic arm, a mold on the part, the mold comprising a cavity having a shape corresponding to the element to be produced, this cavity having an opening, the mold being positioned on the part in such a way that the opening of the mold is closed by at least one outer surface of the part, b) injecting a thermosetting resin into the mold held against the part under conditions allowing the resin to polymerize, c) unmolding the element thus overmolded on the piece.
- the polymerization of the material forming the element is carried out in contact with the part which serves as a support.
- This polymerization leads to a bond between the element and the part which has good mechanical resistance and above all which is slightly variable from one implementation of the process to another.
- the part is not or very little degraded by the manufacturing process, which allows it to retain all of its original mechanical properties. In particular, no hole has to be made in the part during the process.
- thermosetting resin makes it possible to maintain a low injection pressure (typically less than 20 bar), which is easy to counteract using a robotic arm, even of low capacity, in particular a capacity less than 100 kg, or by other means.
- injection pressure typically less than 20 bar
- thermoplastic resin would require much higher pressures (typically greater than 500 bar), which would be incompatible with the use of a robotic arm or an electromagnet to hold the mold during the process. 'injection.
- the mold used for manufacturing can be small in size and easily moved by a robot arm, even of low capacity. It can be easily positioned with very good precision at different locations on the part, and with the desired orientation, depending on the needs.
- the use of a robotic arm makes it easy to automate the manufacturing process, speed up manufacturing and provide good quality control of the assembly between the element and the part.
- the part can be made of composite material, of polymer, thermoplastic or thermosetting material, of a metallic material, or be hybrid and comprise at least one metallic material and one polymer material.
- the part is preferably a part made of composite material, in particular with a matrix of thermosetting polymer material, because this makes it possible to optimize the chemical affinity of the matrix of the part with the resin of the element which is overmolded in contact with it.
- the method may comprise, before step a) of positioning, a step of localized surface treatment of the part on which the element must be overmoulded.
- This step may include sanding, texturing, cleaning, for example with a solvent, and/or plasma treatment, this treatment being carried out manually or automatically, for example using the same robotic arm equipped with a suitable effector .
- the method may comprise, before step a) of positioning, a preliminary step of preheating the mould, the polymerization of the resin being preferably caused by the residual heat of the mould.
- the heat may not be produced directly in the mould.
- the weight and size of the mold are limited, which facilitates its handling and positioning on the part.
- the manufacturing cost of the mold is reduced, which is advantageous when you want to use several molds at the same time on one or more parts.
- the part of the mold which defines the molding cavity is preferably metallic, so as to have a relatively high thermal inertia. It may be made of steel, in order to have a high mechanical strength, in particular of a steel qualified as “hard” to increase its lifespan.
- step a) of positioning and/or step b) of injection the part is advantageously maintained at a temperature well below the temperature of the mold, so as not to degrade it.
- the normal to the surface of the part on which the mold is positioned can form an angle of between 0° and 90° with the horizontal.
- the robotic arm can be used to transport the mold between a preheating station thereof and the part.
- the method may comprise, after or during step b) of injection, a step of heating the mould, for example using one or more heating elements present in the mould, which can make it possible to increase the glass transition temperature Tg of the resin in the mould.
- the robotic arm can be used to counteract the resin injection pressure when filling the mold in contact with the part.
- an electromagnet located behind the part can be used to help counteract the injection pressure.
- the robotic arm can be separated from the mold after the resin has set in gel but before complete polymerization of the latter. This reduces the time during which the robotic arm is monopolized by the element in progress.
- “Gel setting” means the setting by the resin of an intermediate state during the polymerization process thereof, a state in which the resin can no longer flow fluidly, the pressure exerted on the mold to press it against the part which can then be released without risk of resin leakage.
- the mold cavity can be fed through a supply duct provided with a thermal cooler, in particular a finned passive thermal cooler.
- the thermal cooler can also be active if necessary, for example by the forced circulation of a cooling fluid or by the use of a Peltier effect heatsink.
- the supply duct can remain attached to the mold when the robotic arm detaches from the mold; alternatively, this supply duct remains attached to the robotic arm when the latter is detached from the mould.
- the filling of the cavity is carried out, preferably, until the resin reaches an end-of-filling duct, preferably provided with a porous stopper letting the gases out but opposing the passage of the resin.
- the volume of resin injected can be controlled by detecting the arrival of the resin in this end-of-filling duct, by a sensor, in particular optical.
- the volume of resin injected can be controlled by detecting the increase in pressure in the mould.
- the latter can be equipped with a pressure sensor, if necessary.
- the mold can be maintained under pressure against the part by using at least one cylinder, in particular hydraulic or pneumatic, acting between the robotic arm and the mold. In an exemplary embodiment, the mold can be held against the part by a force of between 10 and 200 kg.
- the mould when metallic, can be made of a ferromagnetic material, in order to allow it to be held in contact with the part by the action of a magnetic field passing through it, caused by an electromagnet, which can allow to release the robotic arm more quickly.
- the pressure exerted by the mold on the part can be reduced during injection.
- the maintenance of a pressing pressure of the mold on the part can cease after step b) of injection, in particular after a predetermined duration after the end of the injection.
- This predetermined duration can be between 2 min and 10 min, in particular between 4 min and 7 min.
- the duration chosen is preferably that which is sufficient to ensure that the resin gels in the mould.
- Sealing between the mold and the part can be obtained using a metal lip forming a projection on the mold and pressing against the part.
- This metal lip preferably has a thickness of less than 1 mm, in particular between 0.1 mm and 0.5 mm. Such a thickness prevents damage to the part while ensuring the required seal between the mold and the part.
- the fact that the part of the mold used to produce the molding cavity is made of steel allows the lip to have good mechanical strength over time.
- the robotic arm can carry an interface provided with a resin supply system provided with a first fluidic connector, and the mold can include a second fluidic connector suitable for coupling with the first when the mold is coupled to the interface, to allow the injection of resin into the mould.
- the mechanical coupling between the mold and the interface is carried out for example with a system with one or more locking pins, the interface carrying the locking mechanism.
- the feed system may include a check valve to prevent resin from flowing when the mold is moved by the robotic arm.
- the method may comprise, before step a) of positioning and/or before step c) of unmolding, a step consisting in coupling the mold to the robotic arm.
- a step consisting in coupling the mold to the robotic arm.
- the resin can be injected into the cavity of the mold at a pressure of between 0.5 bar and 5 bar, in particular at a pressure of 2 bar ⁇ 0.2.
- the injection pressure of a thermoplastic material is typically several hundred or even several thousand bars.
- thermosetting polymer resin can be chosen from the group consisting of polyepoxide resins, crosslinked polyurethane resins, polyester resins, vinyl ester resins, cyanate ester resins, phenolic resins, polyurethane resins or a mixture of those -this.
- the resin injected in step b) can be filled, in particular with mineral, metallic or ceramic particles or fibers, for example of glass or carbon.
- the filler can in particular make it possible to modulate the fire resistance, the electrical and/or thermal conductivity and/or the mechanical properties of the element.
- the use of a filler makes it possible to limit the importance of the shrinkage of the resin during its polymerization. Indeed, if the volume shrinkage is too high, the mechanical quality of the connection at the interface between the element and the part can be degraded.
- the volume shrinkage of the resin during its polymerization is less than or equal to 2% and ideally less than 1%.
- Step c) of unmolding the element can be carried out using the robotic arm.
- Step c) of demolding the element can be carried out between 10 min and 30 min, in particular between 12 min and 20 min after the end of step b) of injection. These times vary according to the resins used as well as according to the temperature of the mold.
- Step c) of stripping can be carried out by the robot along a predetermined stripping axis, in particular along an axis normal to the surface of the part on which the mold is positioned.
- the stripping operation can be more complex in the presence of undercuts, and involve a more complex movement of the mold and/or an opening of the mold involving the movement of at least one drawer.
- the stripping operation may be accompanied by the breaking of a core formed by the resin having polymerized in the end of filling pipe and/or in the supply line.
- the end-of-filling conduit and/or the supply conduit may comprise a narrowing in section intended to constitute a preferential rupture zone during the stripping operation.
- the method may comprise, after step c) of demoulding, a step of putting the mold back into service.
- the mold can be cleaned to remove any traces of resin. If necessary, the supply pipe and/or the end of filling pipe can be cleaned and/or at least partially replaced.
- the mold can be reused to form a new element by again implementing the method according to the invention.
- the overmolded element may include, where appropriate, an insert, for example placed in the cavity of the mold before positioning the latter on the part.
- an insert for example placed in the cavity of the mold before positioning the latter on the part.
- the method can be implemented successively with several moulds.
- Another subject of the invention is an installation for implementing the method as defined above, for producing at least one element on a part using at least one mold comprising a cavity having a shape corresponding to the element to be produced, this cavity having an opening, the installation comprising: a system for supplying the mold with thermosetting resin, a system for heating the mold, a robotic arm making it possible to move the mold.
- the installation allows the manufacture of at least one element on the part, in a simple and reliable way.
- the facility is also very adaptive as it can be easily used to fabricate different elements on different parts.
- the mold heating system can be separated from the mold, comprising for example a heating surface on which the mold can be placed while waiting to be used.
- the mold heating system can also include a closed heated enclosure in which the mold is placed before being used.
- the mold or molds can thus be placed, in particular by the robotic arm, on the heating surface or in the enclosure before being positioned on the part for the manufacture of the element or elements.
- the mold can be detachable from the robotic arm. It is then easy to modify the mold and/or to prepare it, and the time of occupation of the robot by the mold can be reduced.
- the robotic arm can, once the resin has gelled in the mold, uncouple from a first mold and go find a second mold to make a second element, the polymerization continuing in the first mold.
- the time required to manufacture these elements is then reduced.
- the robotic arm can carry an interface provided with the resin supply system, the latter being provided with a first fluidic connector suitable for coupling with a second fluidic connector present on the mold, when the mold is coupled to the interface .
- the facility may also include a used mold storage area in which the mold(s) can be placed after an item has been manufactured pending return to service.
- the installation may include a control system for the robotic arm, for example a computer or an automaton, and various mechanical systems for implementing the process.
- the installation may include an electromagnet used to hold the mold against the part, the magnetic field being exerted through the thickness of the part.
- Another subject of the invention is a mold for producing an element on a part, for implementing the method as defined previously and/or used in the installation as defined above, the mold comprising a cavity having a shape corresponding to the element to be produced, this cavity having an opening to be arranged facing the part.
- the mold may include a metal lip forming a projection on the mold and surrounding the opening of the cavity, the metal lip having in particular a thickness less than or equal to 1 mm, in particular between 0.1 mm and 0.5 mm.
- the mold may, if necessary, comprise a seal surrounding said opening of the cavity, in particular outside the aforementioned metal lip, this seal providing an additional barrier by preventing resin leaks if the seal obtained with the lip is not not complete.
- This seal may be an elastomer bead.
- the mold may include a coupling system with the robotic arm. This coupling system may comprise one or more pins on the mold, and one or more corresponding housings on the interface, or vice versa.
- the mold may comprise a supply duct provided with a thermal cooler making it possible to supply the cavity with resin, in particular a passive finned thermal cooler.
- This supply conduit can be a consumable, that is to say be replaced at least partially after each use of the mold.
- the part of the supply duct located at the level of the thermal cooler can be used for several overmouldings, the thermal cooler preventing or limiting the freezing of the resin in this part.
- the mold may include an end-of-filling duct, preferably provided with a porous plug allowing the gases to escape but preventing the passage of the resin, the end-of-filling duct being in particular provided with a thermal cooler, in particular a finned passive thermal cooler.
- the porous plug makes it possible to evacuate the gases trapped in the cavity of the mold and can make it possible to pressurize the resin at the end of filling the mold in order to be able to carry out compacting steps. This can be done for example by adding 1 ml of resin, twice with an interval of 20s, which makes it possible to compensate for the shrinkage of the resin when it crosslinks.
- the end of filling duct can be a consumable, that is to say be replaced at least partially after each use of the mould.
- the end-of-filling duct may comprise at least one part made of a transparent plastic material, so as to allow optical detection of the resin through its wall, this detection being able to provide information on the end of filling of the mould.
- the mold cavity can have a shape without undercut, that is to say allowing the demolding of the element by a simple traction exerted on it.
- the mold can also be more complex and formed of different parts assembled together in a removable manner, for example to form a cavity having an undercut.
- the part of the mold which defines the molding cavity is advantageously made of metal, in particular of steel. This has the advantage of giving the mold good thermal inertia, necessary to maintain a temperature allowing polymerization resin in the absence of proper heating means.
- the temperature of the mold is thus for example 130° C. at the start of injection and 100° C. at the end of injection.
- an interface configured to be coupled to a robotic arm and to a mold as defined above, comprising a fluidic connector capable of being coupled with a fluidic connector complementary to the mold when the latter is coupled to the interface and at least one jack making it possible to maintain the mold under pressure on the part.
- This cylinder can be instrumented in order to allow the system to know the pressure actually applied.
- the interface may include a system for supplying thermosetting resin to the mould.
- the interface may comprise an end-of-filling detector of the mold cavity, in particular an end-of-filling detector intended to detect the arrival of the resin in the above-mentioned conduit at the end of filling of the mold.
- This detector can be optical, as mentioned previously.
- the interface may comprise a system for coupling to the mould, for example a system comprising one or more pins adapted to engage in corresponding housings or vice versa, provided with a mechanism for locking the pins in their housings.
- Another subject of the invention is a system comprising a plurality of molds as defined above and an installation as defined above.
- the system includes for example between 2 and 50 molds to form one or more types of elements on one or more parts.
- the molds can be identical, if necessary.
- Figure 1 illustrates, in side view, schematically, a first step of an exemplary method according to the invention, implemented using a system according to the invention
- Figure 2 illustrates, in side view, schematically, the coupling of the robotic arm and a mold of Figure 1,
- FIG 3 is an enlargement of Figure 2 according to III,
- Figure 4 is a view similar to Figure 2,
- Figure 5 is a view similar to Figure 1 illustrating another step of the method
- Figure 6 is a view similar to Figure 1 illustrating another step of the method
- Figure 7 is a view similar to Figure 1 illustrating another step of the method
- Figure 8 illustrates, in side view, schematically, another step of the process
- Figure 9 illustrates, in side view, schematically, a part comprising an overmolded element according to the method of the invention
- FIG 10 is a schematic perspective view of the element of Figure 9,
- FIG 11 figure 11 illustrates, in side view, schematically, another step of the method according to the invention
- figure 12 illustrates, in perspective, schematically, another example of a part comprising several overmolded elements according to the method according to the invention.
- Figure 13 illustrates, in side view, schematically, another example of installation according to the invention.
- FIG. 1 a system 1 according to the invention, comprising a plurality of molds 10 and an installation 2 allowing the implementation of the method according to the invention to overmold in situ an element E annex on a part P to functionalize .
- Part P is, in this example, positioned on a support T.
- the part P is, for example, a part made of composite material with a thermosetting polymer matrix.
- the installation 2 comprises a system for heating the molds 10 comprising, for example, a heating surface 11 on which they are placed awaiting use.
- the installation 2 comprises a robotic arm 3, with several axes, for example with 6 axes, to which an interface 5 is coupled via a connection system 4.
- the robotic arm has, for example, a capacity of less than 100 kg.
- the interface 5 comprises a frame 110, visible more particularly in figure 2.
- the interface 5 includes at least one hydraulic cylinder 20, shown schematically, acting between the robotic arm 3 and the frame 110 of the mold 10.
- the interface 5 includes connectors 6 able to mate with connectors 7 of the mold 10 to hold the mold 10 secured to the frame 110.
- Connectors 6 and 7 are for example of the matching pin/socket type, configured to mate together.
- a controlled locking mechanism keeps the connectors 6 and 7 coupled.
- This locking mechanism comprises, for example, movable locks 9.
- the locks 9 When the robotic arm 3 and the mold 10 are uncoupled, the locks 9 are in a retracted position. Conversely, when they are coupled, the locks 9 are in an extended position and engage through corresponding passages 8 of the connectors 6 and 7 to ensure that they are maintained in the coupled configuration.
- the robotic arm 3 can carry, on the interface 5, a resin supply system 21 provided with a first fluidic connector 22 secured to the frame 110, coupling with a second fluidic connector 23 secured to the mold 10. This coupling between the two fluidic connectors 22 and 23 takes place automatically when the robotic arm 3 and the mold 10 are coupled and comes apart when their separation.
- the first fluidic connector 22 comprises, for example, a non-return valve making it possible to prevent the resin from flowing when the mold 10 is moved by the robotic arm 3.
- the mold 10 comprises a cavity 12 having a shape corresponding to the element E to be produced and having an opening 13.
- the part of the mold 10 which defines the cavity 12 is preferably metallic, in particular steel.
- the mold 10 comprises a metal lip 14, visible in FIG. 3, forming a projection on the mold 10.
- This metal lip 14 has, for example, a thickness e of between 0.1 mm and 0.5 mm. It may have, as shown, a section of substantially triangular shape.
- the mold 10 comprises a supply conduit 25.
- the supply conduit 25 may comprise a tube 26, carrying the fluidic connector 23, and a nozzle 27 connecting the tube 26 to a channel supply 29 of the cavity 12 of the mold 10.
- the tube 26 is, for example, made of silicone or polymer resistant to the temperature to which the resin is heated.
- the nozzle 27 is, for example, made of a metallic material and comprises a passive thermal cooler 28 comprising fins.
- the mold 10 comprises an end of filling duct 30, opening in this example at the top of the cavity 12.
- the end of filling pipe 30 comprises, for example, a tube 31 and a vent 32 between the tube 31 and an evacuation channel 35 of the cavity 12.
- the tube 31 is for example made of silicone or polymer resistant to the temperature to which the resin is heated.
- the vent 32 can be made of a metallic material and comprise a passive thermal cooler 33, fitted with fins.
- the end of filling conduit 30 is closed by a porous plug 34 letting the gases out but preventing the passage of the resin.
- This porous plug 34 makes it possible to evacuate the gases present in the cavity 12 and which could otherwise form bubbles degrading the quality of the element E.
- the interface 5 may include an optical detector 36 to detect the arrival of the resin in the end of filling conduit 30.
- an optical detector 36 to detect the arrival of the resin in the end of filling conduit 30.
- advantage is taken of the fact that the tube 31 is made of transparent silicone. This tube 31 is held in the mold 10 in such a way that it is positioned close to the detector 36 when the mold 10 is coupled to the interface 5.
- the molds 10 are preheated at the heating station, for example using the heating surface 11 on which they have been placed.
- the molds 10 are thus preheated to a temperature of 140°C.
- the robotic arm 3 of the installation 2 is coupled with one of the molds 10 which has been heated.
- the coupling between the mold 10 and the robotic arm 3 is carried out using the interface 5 carried by the robotic arm 3.
- the robotic arm 3 moves the mold 10 and positions it on the part P, for example so that the normal n to the surface S of the part on which the mold 10 is positioned form with the horizontal H an angle of 90 °.
- the mold 10 is positioned on the part P in such a way that the opening 13 of the mold 10 is closed by the outer surface S of the part P.
- the seal between the mold 10 and the part P is, in this example, obtained using the metal lip 14 applied against the part P.
- the mold 10 is kept under pressure against the part P using the hydraulic cylinder(s) 20, acting between the robotic arm 3 and the mold 10.
- the mold 10 can be maintained in pressure against the part P by the action of a magnetic field passing through the latter, the mold 10 being in this case made of a ferromagnetic material, as will be described later. far.
- thermosetting resin is injected into the mold 10 held against the part P. At this time, the temperature of the metal part which defines the cavity 12 of the mold is still relatively high, due to the thermal inertia of the latter, and for example greater than or equal to 130°C.
- Resin from supply system 21 passes through supply conduit 25 of mold 10.
- the thermal cooler 28 makes it possible to evacuate the heat and thus prevent the heat from propagating beyond it into the tube 26. In this way, the resin does not polymerize in the supply system 21, which makes it possible to perform several injections without having to clean or change the supply system 21.
- the filling of the cavity 12 is done by the injection of a resin coming from the supply system 21 and passing through the supply conduit 25 and the supply channel 29.
- the injection of the resin can be done as illustrated from the bottom of the cavity 12 of the mold 10.
- the filling of the cavity 12 takes place until the resin reaches the end of filling conduit 30, positioned for example at the top of the cavity 12.
- the thermal cooler 33 makes it possible to evacuate the heat upstream of the vent 32 and thus prevent the resin from polymerizing in the latter.
- the volume of resin injected is controlled by the optical detection, using the detector 36, of the arrival of the resin in the end of filling conduit 30.
- the temperature of the metal part of the mold 10 is for example about 100°C.
- the part of the mold 10 used to define the cavity 12 gives it sufficient heat capacity for the temperature in the cavity 12 of the mold 10 to be high enough to fully polymerize the resin.
- the robotic arm 3 makes it possible to counteract the injection pressure of the resin during the filling of the mold 10 in contact with the part P.
- the resin is injected, for example, at a pressure of 2 bar.
- the injection of the resin into the cavity 12 of the mold 10 lasts for example 2 min.
- the resin is, for example, a polyepoxy resin loaded with particles giving the resin fire resistance.
- the polymerization of the resin in the cavity 12 of the mold is caused by the residual heat of the mold 10, resulting from the mold preheating step 10.
- the maintenance under pressure of the mold 10 on the part P can be reduced, because the resin has gelled.
- the mold 10 is left on the part P and the polymerization of the resin in the cavity 12 continues.
- the robotic arm 3 After being separated from the mold 10, the robotic arm 3 is for example moved in order to couple with a second mold 10 present at the preheating station. This second mold 10 will in turn be positioned on part P to produce a second element E.
- This demoulding can be carried out by a movement of the robotic arm 3 along an axis D.
- This movement of the robotic arm 3 makes it possible to break the core of resin which has polymerized in the supply channel 29 and in the evacuation channel 35, and thus to release the element E from the mold 10.
- This demoulding step occurs, for example, approximately 15 min after the end of the injection.
- the element E obtained after demolding is for example as illustrated in Figures 9 and 10.
- the element E comprises for example a base 40 of substantially circular shape, which can comprise openings allowing screws to be placed in the applications where intended.
- a base 40 of substantially circular shape, which can comprise openings allowing screws to be placed in the applications where intended.
- On this base 40 extends a cylinder 42 which has at its base reinforcing ribs 43, for example four, of substantially triangular shape.
- a seventh step illustrated in FIG. 11, the mold 10 is moved into a zone 45 for re-preparing the molds used to be put back into service after cleaning.
- the cavity 12, the supply channel 29 and the evacuation channel 35 of the mold 10 can be cleaned to remove any traces of resin.
- the nozzle 27 and the vent 32 are also cleaned to remove any traces of resin and thus be reused. If necessary, the nozzle 27 and the vent 32 could also constitute low cost consumables which would be replaced for each new part.
- the tubes 26 and 34 can, for their part, be replaced by new ones.
- part P comprises two beams 100 on which the elements E have been overmolded.
- the part can be of any shape, for example have a curvature or comprise another material, for example metal.
- the mold 10 may include a cavity of a different shape.
- the system can include more moulds, for example between 3 and 50 moulds.
- An electromagnet 200 can be used to hold the mold 10 applied against the part P after separation from the robotic arm 3, as illustrated in FIG. 13.
- the magnetic field is exerted by F electromagnet through the part P. It is then possible, once the mold 10 has been correctly positioned by the robotic arm on the part, to activate the electromagnet, to proceed with the injection of the resin, then to uncouple the robotic arm and the mold as soon as the injection is finished , the mold being held in place against the workpiece by an electromagnet.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2200125A FR3131705B1 (fr) | 2022-01-08 | 2022-01-08 | Procédé de surmoulage d’un élément en matériau polymère thermodurcissable |
| PCT/EP2023/050025 WO2023131587A1 (fr) | 2022-01-08 | 2023-01-02 | Surmoulage d'un élément en matériau polymère thermodurcissable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4460416A1 true EP4460416A1 (fr) | 2024-11-13 |
Family
ID=80933367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23700384.3A Pending EP4460416A1 (fr) | 2022-01-08 | 2023-01-02 | Surmoulage d'un élément en matériau polymère thermodurcissable |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4460416A1 (fr) |
| FR (1) | FR3131705B1 (fr) |
| WO (1) | WO2023131587A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005014802A1 (de) * | 2005-03-31 | 2006-12-14 | Bayerische Motoren Werke Ag | Vorrichtung und Verfahren zur Herstellung eines Kunststoff-Metallverbundteils, insbesondere eines Karosserieteils für ein Fahrzeug |
| EP2908038B1 (fr) * | 2014-02-13 | 2020-04-01 | Airbus Operations GmbH | Procédé et système robotique pour la fixation d'un dispositif |
| DE102017006863B4 (de) * | 2017-07-19 | 2025-10-02 | Mercedes-Benz Group AG | Anlage zur inline-Herstellung eines Leichtbauteils in Hybridbauweise in Form einer mit hybriden Strukturen zu versehenen Fahrzeugkarosserie |
| US20220088845A1 (en) * | 2019-01-29 | 2022-03-24 | Coexpair | Improvements in or relating to injection systems |
-
2022
- 2022-01-08 FR FR2200125A patent/FR3131705B1/fr active Active
-
2023
- 2023-01-02 EP EP23700384.3A patent/EP4460416A1/fr active Pending
- 2023-01-02 WO PCT/EP2023/050025 patent/WO2023131587A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3131705B1 (fr) | 2024-07-12 |
| WO2023131587A1 (fr) | 2023-07-13 |
| FR3131705A1 (fr) | 2023-07-14 |
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