WO2017037229A1 - Procede et dispositif pour la fabrication de pièces en matériau synthétique renforcées par des fibres - Google Patents

Procede et dispositif pour la fabrication de pièces en matériau synthétique renforcées par des fibres Download PDF

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Publication number
WO2017037229A1
WO2017037229A1 PCT/EP2016/070712 EP2016070712W WO2017037229A1 WO 2017037229 A1 WO2017037229 A1 WO 2017037229A1 EP 2016070712 W EP2016070712 W EP 2016070712W WO 2017037229 A1 WO2017037229 A1 WO 2017037229A1
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WO
WIPO (PCT)
Prior art keywords
cavity
tool
gap width
during
correction device
Prior art date
Application number
PCT/EP2016/070712
Other languages
German (de)
English (en)
Inventor
Matthias Graf
Original Assignee
Dieffenbacher GmbH Maschinen- und Anlagenbau
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 Dieffenbacher GmbH Maschinen- und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen- und Anlagenbau
Priority to EP16763002.9A priority Critical patent/EP3344446A1/fr
Publication of WO2017037229A1 publication Critical patent/WO2017037229A1/fr

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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
    • 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
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/546—Measures for feeding or distributing the matrix material in the reinforcing structure
    • 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
    • B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
    • 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
    • B29C33/0061—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the material feeding channel
    • 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
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/20—Opening, closing or clamping
    • B29C33/202—Clamping means operating on closed or nearly closed mould parts, the clamping means being independently movable of the opening or closing 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • 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
    • 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
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • 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
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/467—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements during mould closing
    • 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
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C2043/3205—Particular pressure exerting means for making definite articles
    • B29C2043/3238—Particular pressure exerting means for making definite articles pressurized liquid acting directly or indirectly on the material to be formed
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5825—Measuring, controlling or regulating dimensions or shape, e.g. size, thickness
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • B29C2045/564—Compression drive means acting independently from the mould closing and clamping means

Definitions

  • the present invention relates to a method for producing fiber-reinforced plastic parts according to the preamble of claim 1.
  • the present invention further relates to an apparatus for producing fiber-reinforced
  • CFRP components Plastic components (CFRP components) are nowadays used in industrial applications, even in large series, various methods:
  • plastic parts are produced by extrusion, transfer molding or injection molding by mixing resin systems with fibers and curing them.
  • D-SMC process sheet molding compound
  • LFT-D long fiber reinforced thermoplastics in direct process
  • a fiber preform fiber preform also called preform, which is usually preformed, is placed in a preferably cleaned and separated, i. inserted with an anti-adhesive coated cavity of a mold.
  • the mold is then closed by means of a press and a resin system (matrix) injected into the cavity of the mold, wherein it
  • Matrix material permeates the fiber structure of the fiber preform and the fibers includes. After curing of the resin system, the final shape of the fiber-reinforced plastic component thus obtained can be removed from the mold.
  • High cavity pressures of, for example, 35 to 100 bar are inherent in today's so-called high-pressure RTM process (HD-RTM, H (igh) P (ressure) -RTM), which are based on the production of, in particular, fiber-reinforced plastic components, such as
  • HP-CRTM high pressure compression RTM
  • HP-IRTM high pressure injection RTM
  • the DRTM process is also known in which the advantages of the IRTM and the C RTM process are combined and after an injection phase, a compression phase is provided with pressing a predetermined amount of resin from the cavity.
  • DE 10 2012 1 10 354 A1 discloses inter alia a molding tool and a preferred method for carrying out an HP-CRTM method
  • a double seal kit is provided which, after evacuation and prior to injection of the resin into the cavity, seals the vacuum port from the cavity.
  • DE 10 201 1 051 391 A1 describes a device for carrying out an IRTM method for production, wherein the device has an injection unit and a closable housing provided with a mold cavity
  • Tool and the injection unit is coupled to the tool, such that an injection resin can be introduced into the tool, wherein the
  • Tool has at least one closable by means of a resin flow-closing unit and connected to the mold cavity resin exit from
  • the plastic components are heavily affected by the
  • Forming tools are usually multi-part, they must be matched and manufactured high quality to each other. For this purpose, it is generally necessary to provide elastomer seals and / or so-called dipping edges on the edges.
  • predetermined thickness profile provides the producers, especially in high-pressure Applications of over 35 bar before special problems with the mold and the press.
  • the molds are reworked by means of a variety of methods (grinding, build-up welding, washers between platen and tool, etc., etc.) so that the thermal effects (bending, stretching) at the end of the manufacturing process no longer play a significant role. Also the difference between a main press and a
  • Spotting press can also be compensated with experience and corresponding calculations, whereby it is also assumed here that the almost perfect boundary conditions always have to be complied with.
  • the present invention has for its object to provide a comparison with the prior art improved method and an apparatus with which it is possible to avoid the disadvantages of the prior art.
  • the object is in particular for a method for producing a fiber-reinforced plastic component with a flowable resin system in a mold comprising at least two tool parts for forming a cavity and a press with a printing device for applying a
  • the resin system moves within the cavity as part of the manufacturing process and thereby forms a flow process, and finally within the cavity, a fiber-reinforced plastic component is formed with at least one gap width of the cavity.
  • At least one sensor is used for continuously detecting the
  • the senor should absorb pressure, temperature, strain or the like, so that the control and regulation device can perform a desired-actual comparison for actuating the correction device in accordance with the predetermined values.
  • Alternatively or in combination can be used as a correction device hydraulic and / or pneumatic actuators, which are operatively connected in the tool parts on the press and / or on the platen of the tool parts.
  • At least one actuator of the printing device can be used as a correction device, wherein in particular the one actuator of the correction device introduces a different force into the mold than the actuator of
  • the gap width can be adjusted by a dynamic adjustment during the manufacturing process, in particular such that towards the end of the manufacturing process, the flow resistance is greatest and, if necessary, the Nachelle is enabled. Again, it is possible that it is possible to adjust the necessary pressures and deflections on the control or regulating device based on measured values and in particular to monitor during the manufacturing process and thus to control or regulate.
  • Target wall thickness of the plastic component is achieved.
  • the flow process of the resin system in particular the flow front, can be calculated from the self-adjusting counter pressures in the pressure device, the correction device, the currently measured gap widths SW and / or the volume of the resin system and a dynamic adjustment of the pressure distribution to control the flow process F.
  • the gap width is increased by appropriate control of the correction device.
  • the flow process may be affected.
  • the gap width may be substantially at the center of the
  • the smallest gap width is controlled and the gap width from this point, preferably in all directions, to the edge of the cavity out the gap width is greater than the desired wall thickness of the plastic component and this difference increasingly reduced at the end of the press cycle and performed at zero.
  • the sealing effect in particular the dipping edge and / or the elastomer seals used, between the tool parts can be improved by influencing the bending line of at least one tool part.
  • the bending line of at least one tool part can be adjusted such that a collision of the corresponding dipping edges of two tool parts is avoided and / or the wear on the dipping edges is minimized by reducing the friction.
  • Plastic component with a flowable resin system has a mold, which comprises at least two tool parts for forming a cavity, and a press with a printing device for applying a pressing pressure to the mold on clamping plates for the tool parts, wherein
  • At least one tool part is deformed along a bending line B in the course of the production process and / or
  • the resin system moves within the cavity as part of the manufacturing process, forming a flow process
  • a fiber reinforced plastic component having at least one nip width of the cavity can be formed.
  • a correction device is arranged.
  • the device at least one sensor for continuously detecting the flow process, the bending line and / or the gap width with a control or regulating device for controlling or regulating the
  • Correction device may be arranged.
  • the sensor is capable of pressure
  • Control device can use a target-actual comparison for driving the correction device.
  • Alternatively or in combination can be arranged in the device as a correction device hydraulic and / or pneumatic actuators in the tool parts, on the press and / or on the platen of the tool parts.
  • Printing device to be suitable to be used as a correction device, in particular by the ability to initiate a differentiated force against the actuators of the printing device.
  • the device at least one sensor for continuously detecting the position of the dipping edges with a control or
  • Control device for controlling or regulating the correction device may be arranged.
  • the gap width of the cavity is continuously detected by at least one sensor and controlled by means of said pressure and correction devices by means of a central processing unit (CPU).
  • CPU central processing unit
  • Plastic components is set. According to the proposed method can be in a closed
  • Control loop or in an adjustable control sequence the pressure distribution over the surface of the cavity and / or the gap width over the surface of the cavity within a press cycle are dynamically changed within a press cycle, thereby advantageously influencing the flow process.
  • the gap width can be influenced in such a way that the flow resistance is reduced by the dynamic adjustment of the gap width in the respective phase of the flow process.
  • Gap setting adjusted in which the gap width in all areas of the component as best as possible corresponds to the target wall thickness.
  • the flow front of the resin can be calculated from the counter pressures occurring in the individual correction devices and / or via the current measured gap width or the injection volume. There is a dynamic adjustment of the pressure distribution across the surface by means of the correction devices to actively control the flow front.
  • the gap width is kept larger by corresponding activation of the correction device than in the other regions of the cavity.
  • a moldable fiber-reinforced plastic mass gap width can be set in the center of the inserted molding compound least; From this point on, the gap width increases in all directions to the edge of the cavity. The difference is increasingly reduced towards the end of the press cycle in order to promote the flow process and to adhere to the setpoint values for the gap width towards the end of the process.
  • the invention thus enables an active deformation control of at least one tool part or the clamping plate and thus indirectly a tool part.
  • a plurality of actuators asymmetric molds individually with a
  • Wirrfasermatten recycled fiber mats consist or mixed into the resin be..
  • FIGS 1 to 3 illustrate the deformation of the tool parts in one
  • Figures 4 to 6 illustrate the possibilities of influencing a
  • Figures 7 to 9 illustrate the possibilities of influencing a
  • Correction device with exemplary marking possible force vectors and an additional view from below of the platen with the points of attack of the correction device
  • FIG. 11a schematically shows an exemplary flow process according to FIG.
  • FIGS 1 1 b and c show the possibility of the flow process in its course
  • Figure 12 shows a device according to a third embodiment in which the correction device between the two
  • Platen is arranged for the tool parts
  • FIG. 13a shows by way of example a deliberate application of force during one
  • FIG. 13 b shows by way of example the possibility of the sealing effect of FIG
  • FIGS. 14 to 17 show by way of example the sequence of a D-RTM method for producing a plastic part, wherein
  • Figure 15 shows the mold in an optional sealing position B for
  • the mold is shown in the end position D, wherein during the movement into the end position D, the pressed out and excess resin is squeezed out of the cavity via a resin outlet.
  • FIG. 18 shows an overview of the means for controlling the flow of resin and an exemplary illustration of FIG
  • Figures 1 to 3 show a conventional molding press of the prior art for producing fiber-reinforced plastic components.
  • the press 10 essentially comprises a press frame with an upper and lower crosshead and these connecting columns. Between the Quertudeuptern a printing device 1 1 with two hydraulic actuators and clamping plates 5, 7 for the tool parts 4 and 6 is arranged. In the present example, only the upper platen 5 by means of the printing device 1 1 is movable.
  • Figure 1 shows that state in which the cavity between the two
  • Tool parts 4, 6 is open.
  • the mold 2 is already heated, for example, to a temperature of 160 ° C.
  • By heating the two tool parts 4, 6 are subject to a deflection.
  • the deflections are illustrated by the dashed lines B of bending.
  • Within the cavity there is already a fiber preform 3 for a possible RTM process.
  • a resin system with corresponding fiber content (D-SMC, LFT-D) could be inserted in an extrusion molding process.
  • the two arrows on the printing device 1 1 symbolize the closing operation of the cavity by moving the upper tool part 4 in the direction of the stationary tool part. 6
  • Tool parts 4, 6. This leads to a local expansion of the tool shapes, and thus to an irregularity.
  • the bending lines B are essentially unchanged. However, they show that the maximum deflection of both tool parts 4, 6 is greatest in the area of the center axis of the press frame. The gap width SW is thus minimized there.
  • Figure 3 illustrates the final state of the injection.
  • the pressure in the device and thus on the mold is particularly high.
  • the two bending lines B in the upper and lower tool parts 4, 6 now run differently than in the preceding figures. The bends have reversed.
  • the plastic component 1 has arisen in the cavity. Due to the effects of temperature and pressure, the plastic component now has a thickness profile that is not optimal.
  • the gap width SW will be near the center axis due to the influences greater than the target value.
  • the workpiece must still be machined after removal from the press or is considered scrap. To remedy this situation is usually carried out as already above to the prior art, the mold 2 in advance so edited that at the end of the
  • a printing device 1 1 two actuators are arranged on the outside, whereas as a correction device 8 centered another actuator, in the present case a column with Circumferential grooves is arranged. In the present case, the correction device 8 is also used to fast opening and closing movements with low
  • a corresponding clamping device for positive locking (not shown) is usually provided on the column.
  • this column can also be used to set the maximum and minimum stroke of the printing apparatus 11 in the case of different molds.
  • the actuators of the pressure and the correction device are in
  • the actuators are preferably designed double-acting.
  • a fiber preform 3 is inserted into the open cavity in FIG. 4 and the molding tool is closed by means of the printing device 11.
  • the pressure device 11 amplifies the introduced force (forces shown as vectors) as the closing force for the
  • Forming tool 2 Alternatively, an extrusion process could take place here in which the resin system with mixed-in fiber fractions is simply inserted into the cavity and then pressed. As a result of the counterpressure arising, the bending lines B now change, but clearly show that a satisfactory gap width in the cavity can not be set by the different bending lines in the tool parts 4, 6.
  • the correction device 8 is activated according to FIG. 6 and presses the bending lines B such that both bending lines B of the tool parts 4, 6 are substantially parallel to one another. Since the two tool parts 4, 6 have been prepared correspondingly dimensionally stable to each other, results over the profile of the plastic component 1, the predetermined thickness according to the gap width SW of the cavity.
  • FIGS. 7 to 9 show a second embodiment of the device. Again, the same reference numbers will be used as before.
  • the press 10 is open. In Figure 8, it is partially closed. In Figure 9, it is completely closed; the end of the forming process is reached.
  • the press 10 has outer columns with teeth on which the clamping plate 5 with the clamped tool part 4 in the closed press position of Figure 8 positively locked by means of a clamping device (not shown). Alternatively and preferably, these are carried out in the form of threaded spindles, over which also the pressing pressure can be exerted.
  • the actuators of the correction device 8 are distributed over the surface of the lower platen 7 and supported on the lower crosshead. Due to the multiplicity of action points, the correction device 8 can influence the deformation work of the lower clamping plate 7 and thus the tool part 6.
  • FIG. 10 shows the shape, the arrangement and a possible mode of action via the force vectors of the adjusting devices of the correction device 8.
  • Exemplary plan view of the platen 7 from below is shown below.
  • the bending line of the molding tool 2 the gap width SW and / or the flow process F can be varied during the production process, in particular dynamically.
  • the outer columns only perform the closing stroke, preferably as a rapid lift. After locking take over the actuators arranged below the
  • Correction device also the compression stroke in a C or D-RTM method. At the same time, however, these also serve, by virtue of the different force vectors, for the static and / or dynamic influencing of the bending line, which in this example likewise again parallel to the top and bottom at the end of the pressing cycle
  • Tool part extends and thus results in a uniform gap width SW for producing the predetermined geometry of the plastic component.
  • a device ideally has at least one sensor, not shown here.
  • the sensor detects, for example, the gap width, strains on the tool or the clamping plate or other suitable parameters. That's it it is desirable to provide a plurality of sensors to detect the gap width SW across the entire cavity and to take appropriate action accordingly.
  • the measures consist in that the correction device 8 is controlled accordingly in order to achieve a desired course of the gap width SW over the surface of the cavity. In general, one will want to create a constant gap width throughout the cavity. However, it may also be desirable to produce different gap widths, depending on the design of the plastic part 1 to be manufactured.
  • FIG. 11 a schematically shows an exemplary flow process according to the prior art, and FIGS.
  • 11 b and c show the possibility of specifically influencing the flow process in its course compared to the prior art.
  • a rectangular cavity is shown, in the bottom left of the resin inlet 12 is shown.
  • the flow process F will start there and continue from bottom left to top right until the cavity is filled with the resin system.
  • the wavy lines are intended to symbolize the progress of the flow front over time. According to the invention it is now possible, the flow process F without artificial voids,
  • Figure 12 shows a device according to a third embodiment in which the correction device 8 is arranged between the two clamping plates for the tool parts.
  • This can be designed as outside of the mold 2, preferably double-acting, cylinder which press or pull the clamping plates 5 and 7 in the closing or compression position of the device apart, while the printing device 1 1, analogous to Figure 6, applies the clamping force.
  • the bending line B of a device could be selectively influenced.
  • FIG. 13 shows, by way of example, how to reduce the friction or risk of collision between the dipping edges of the tool parts by targeted application of force during a closing or opening movement and / or to increase the sealing effect of dipping edges or similar sealing means during the production process.
  • Clamping plate 7 and / or the tool part 4 with forces (not shown) are acted upon, that bend the dipping edges 9 to the outside, so that less friction and thus almost no abrasion in the movement of the dipping edges will occur to each other.
  • the horizontal arrows do not represent the forces acting but should represent the deforming dipping edges.
  • the sealing action can now be reinforced in the closed state, especially when extruding or injecting high-pressure resin systems, with corresponding introduction of forces (not shown) when the dipping edges or the areas with seals are pressed in accordance with one another ,
  • FIGS. 14 to 17 show the sequence of a D-RTM method for producing a plastic part 1.
  • Fig. 14 shows that at least two tool parts 4, 6 comprehensive molding tool 2 of a RTM system in an open position A.
  • the upper tool part (male) 4 and the lower tool part (die) 6 in such a way to each other
  • At least one, in particular, is located between the tool upper part 4 and the tool lower part 6 Elastomer-containing, main seal.
  • two or more seals 15 and 19 may optionally be provided, which seal one tool part 4 with the other tool part 6.
  • at least one vacuum connection 20 is formed in at least one tool part 4, 6.
  • FIG. 15 shows the two-part molding tool 2 of an RTM installation from FIG. 14 with a preformed insert inserted therein - but simplified in the exemplary embodiment
  • Vacuum port 20 is evacuated.
  • Fig. 16 shows the two-part mold 2 of FIG. 15 in a second, more closed injection position C, in which the opening to the vacuum port 20 now by the first (lower) seal 5 against the cavity formed by the tool parts 4, 6 and Tool parts 4 and 6 are additionally sealed by a second (upper) seal 19, so that via the vacuum port 20, the vacuum can still be held securely in the mold 2, when the tool parts 4, 6 already in the injection position for introducing the resin system were moved into the evacuated cavity.
  • a seal 15 may be sufficient if, in the course of driving the tool parts 4, 6 from the sealing position B to the injection position, it can completely cover the opening to the vacuum port 20. But even in this special case, it may be useful to provide a second seal 19. That's the danger
  • Fig. 17 shows the two-part mold 2 of Fig. 16 in the third, final
  • End position D in which the cavity left by the tool parts 4 and 6 now corresponds to the desired component thickness of the plastic component 1 to be manufactured, so that the resin previously injected over the area into the pores and
  • Vacuum device 23 operatively connected, which can be decoupled from the cavity by means of a valve 25. This is particularly advantageous if the vacuum port 20 is also in operative connection with the cavity during the injection position C or end position D. Also at the injection port 17 is a valve 22 that the
  • Injection device 21 is to protect against excessive pressure during the extrusion of the resin from the cavity.
  • the resin outlet 18 is closed by a valve 24.
  • the valve can be designed controllable and will set a minimum pressure in the mold, which is specified.
  • the valve 24 during the injection of the resin in the cavity specify a minimum pressure, but also a minimum pressure for the
  • valve 24 will preferably be connected to the appropriate sensor or to the control means to the
  • Tool part 6 short-stroke cylinder can be arranged or connected, which can attack directly or indirectly on the tool part 6 to this in certain situations statically or dynamically during the manufacturing process with forces
  • these adjusting means are used to the
  • the flow front of the resin can be supported or influenced by bending the at least one tool part.
  • Tool part set by external forces F which press on the left side and pull on the right side of the tool part, so that the cavity is exemplified in the direction of the resin outlet 18 is greater. This is preferably timed appropriately during the injection or the extrusion. Of course, at the end of the pressing or during the curing of the resin, the introduction of the forces in the tool part is adjusted so that the dimensional accuracy of the plastic component 1 is ensured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour la fabrication d'une pièce (1) en matériau synthétique renforcée par des fibres présentant un système de résine pouvant s'écouler dans un outil de moulage (2), qui comprend au moins deux parties d'outil (4, 6) pour former une cavité et une presse (10) pourvue d'un dispositif de pressage (11) pour appliquer une pression de moulage sur l'outil de moulage (2) via des plateaux de fixation (5, 7) pour les parties d'outil (4, 6), au moins une partie d'outil (4, 6) se déformant le long d'une ligne de pliage (B) au cours du procédé de fabrication et/ou le système de résine se déplaçant dans la cavité au cours du procédé de fabrication et subissant ainsi un processus d'écoulement (F) et, enfin, une pièce (1) en matériau synthétique renforcée par des fibres étant formée dans la cavité présentant au moins une largeur de fente (SW) de la cavité. Selon l'invention, au moins un dispositif de correction (8) permet d'influencer, pendant le procédé de fabrication, la ligne de pliage (B) d'au moins une partie d'outil (4, 6) et/ou le processus d'écoulement (F) et/ou la largeur de fente (SW).
PCT/EP2016/070712 2015-09-03 2016-09-02 Procede et dispositif pour la fabrication de pièces en matériau synthétique renforcées par des fibres WO2017037229A1 (fr)

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FR3093460A1 (fr) * 2019-03-08 2020-09-11 Etancheite Et Frottement J.Massot Dispositif de surmoulage d’une âme
DE102019110705A1 (de) * 2019-04-25 2020-10-29 Neue Materialien Fürth GmbH Thermischer Aktor, Pressvorrichtung und Verfahren zur Herstellung eines Presserzeugnisses
DE102020127719B3 (de) 2020-10-21 2022-03-10 Neue Materialien Fürth GmbH Pressvorrichtung und Verfahren zur Herstellung eines Presserzeugnisses
US20230054826A1 (en) * 2021-08-18 2023-02-23 Formosa Plastics Corporation Mold for carbon fiber composite material

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JPH01216814A (ja) * 1988-02-25 1989-08-30 Kobe Steel Ltd 圧縮成形機のスライド位置制御方法
EP0401501A2 (fr) * 1989-05-13 1990-12-12 Umformtechnik ERFURT GmbH Procédé pour influencer le mouvement d'écoulement frontal pendant le pressage de matières et dispositif pour la mise en oeuvre du procédé
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FR3093460A1 (fr) * 2019-03-08 2020-09-11 Etancheite Et Frottement J.Massot Dispositif de surmoulage d’une âme
US11407152B2 (en) 2019-03-08 2022-08-09 Etancheite Et Frottement J.Massot Device for overmolding a core
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DE102019110705B4 (de) 2019-04-25 2024-01-18 Neue Materialien Fürth GmbH Pressvorrichtung und Verfahren zur Herstellung eines Presserzeugnisses
DE102020127719B3 (de) 2020-10-21 2022-03-10 Neue Materialien Fürth GmbH Pressvorrichtung und Verfahren zur Herstellung eines Presserzeugnisses
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US20230054826A1 (en) * 2021-08-18 2023-02-23 Formosa Plastics Corporation Mold for carbon fiber composite material

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