EP3877162A1 - Procédé de détermination du comportement de plastiques renforcés par des fibres pendant la fabrication, dispositif et installation - Google Patents

Procédé de détermination du comportement de plastiques renforcés par des fibres pendant la fabrication, dispositif et installation

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Publication number
EP3877162A1
EP3877162A1 EP19798050.1A EP19798050A EP3877162A1 EP 3877162 A1 EP3877162 A1 EP 3877162A1 EP 19798050 A EP19798050 A EP 19798050A EP 3877162 A1 EP3877162 A1 EP 3877162A1
Authority
EP
European Patent Office
Prior art keywords
mold
mandrel
preform
production
behavior
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
Application number
EP19798050.1A
Other languages
German (de)
English (en)
Inventor
Sathis Kumar SELVARAYAN
Markus Milwich
Götz Theo GRESSER
Simon Küppers
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.)
Deutsche Institute fuer Textil und Faserforschung Stuttgart
Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
Original Assignee
Deutsche Institute fuer Textil und Faserforschung Stuttgart
Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
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 Deutsche Institute fuer Textil und Faserforschung Stuttgart, Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF filed Critical Deutsche Institute fuer Textil und Faserforschung Stuttgart
Publication of EP3877162A1 publication Critical patent/EP3877162A1/fr
Pending legal-status Critical Current

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
    • 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
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
    • 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

Definitions

  • the invention relates to the field of manufacturing fiber-reinforced plastic parts by pulling (pultrusion).
  • a method for determining the behavior, in particular the adhesive and friction behavior, of fiber-reinforced plastics, in particular synthetic resins is specified during manufacture, in particular during the curing of the synthetic resin.
  • a preform which can be composed of fiber and matrix material and optionally further materials, is arranged between a rotating mandrel (mandrel) and a form of a test device. The mandrel and the mold are rotated relative to each other. At least one value of a drive torque and / or a support torque is recorded.
  • a flow or partial forces of the sum of the forces which must at least be overcome by means of the pulling force, can be determined in a virtually endless experiment.
  • Different production mold lengths in the continuous drawing process can be simulated regardless of the speed.
  • the method according to the invention offers a high degree of freedom to examine the influence of parameters (eg production time, speed, mold length) independently of others, in particular because of the endless conveyance of the preform along the friction surface.
  • the Si Simulation of any slow curing or slow heating of the preform can be simulated, which corresponds to a long shape in the strand drawing process with only a low temperature and / or a low drawing speed.
  • the preform may be, for example, a plastic and / or plastic material that is interspersed with fibers.
  • the fibers can be in individual filaments, strands, textiles, etc. Before preferably the fibers are wrapped around the mandrel to be oriented substantially in the circumferential direction.
  • a preform is applied to a rotating mandrel and then the mandrel is placed in a mold (or in a different order). The mandrel and the mold are rotated relative to each other. At least one value of a drive torque and / or a support torque is recorded.
  • the shaft preferably rotates coaxially within a heated cylindrical shape of constant (over the length) or varying (over the length) cross section.
  • the mold can preferably be heated before.
  • the mandrel can be heated, for example.
  • additional parameters can optionally be recorded.
  • the pressure in the mold, the temperature or the temperature profile (temporally and / or spatially axially in the mold) can be recorded.
  • the drive torque and / or the are preferred Support torque recorded over time.
  • the temporal course of moments can be converted into a course of force.
  • the temporal course of the moment corresponds to a local force course within the shape in the conveying direction.
  • the angular velocity of the reinforcing material or preform corresponds, during the determination, to the angular velocity of the mandrel. This corresponds to the relative angular velocity between the preform
  • the mandrel can be designed to take the reinforcing material or the preform with it.
  • the mandrel and the preform ling can interlock positively.
  • the frictional torque between the mandrel and the preform can always be greater than the frictional torque between the preform and the mold, in sections of the test process or in the entire test process. Since the friction between the preform and the surface of the manufacturing mold can be simulated on a relatively large area.
  • the mold and / or the mandrel can be heated. At least the element, mandrel or mold, is preferably heated, which is rotated relative to the preform or is moved along the preform or has a different angular velocity than the preform. This simulates conditions as in the real manufacturing process in which the manufacturing mold through which the preform is drawn is heated becomes .
  • the determination is carried out with at least two different preforms and the results show that the behavior of a third preform in the form of the test device and / or in a production form in a production line for extrusion closed.
  • the determination can be carried out with a preform and the result can be used to infer the behavior of a third preform.
  • the third preform can differ from the one preform or the at least two different preforms, particularly with regard to its shape.
  • the one or the at least two different preforms can have a geometry that allows a test in the device with which the method is carried out. It is possible that this geometry, e.g.
  • interpolation or extrapolation can be used to infer the behavior of the third preform in a test device for executing the method according to the invention and / or in a production mold or a production line for a real production process.
  • a further method is provided, which can be used to design, set up and / or control a manufacturing process.
  • the determined behavior which was determined by means of an embodiment of the method described above, is used to at least one parameter of the manufacturing process.
  • Parameters of the manufacturing process can be, for example, the temperature or the temperature profile (temporally and / or locally) in the manufacturing mold, that is the shape with which the fiber-reinforced profile is produced in the manufacturing process, the inner shape of the manufacturing mold, the material and / or the Surface quality of the manufacturing mold and / or the composition of the material of the preform and / or the composition of the product.
  • the device for determining the behavior of fiber-reinforced plastics during manufacture.
  • the device has a rotating mandrel (mandrel), a shape and a device for rotating the mandrel and the shape relative to one another.
  • a preform can be received between the mandrel and the mold as described above.
  • the device also has at least one means for detecting the drive torque and / or the support torque.
  • the roughness of the mandrel and the shape can have a different amount.
  • the mandrel and the shape are preferably set up in such a way that the mandrel takes the reinforcing material made of fibers or the preform with it, so that the reinforcing material and even more preferably the preform with hardened resin has the same angular velocity as the mandrel.
  • a system for production and / or production planning which has a database with at least one or more results of determining the behavior according to one of the contains the method described above or by means of the vorste described above.
  • a result can be a parameter of a production process, for example.
  • the system preferably has an input device and a determination device, the system being set up in such a way that a user of the system can use the input device to specify a geometry and / or composition of a preform and / or product and the determination device determined at least one production parameter.
  • the determining device can determine the production parameter on the basis of one or more production parameters for one or more geometries and / or composition of preforms and / or products, for which determination results are available in the database, which are by means of one of the methods described above or devices are determined, and / or on the basis of interpolated and / or extrapolated determination results which are based on determination results determined by means of one of the methods or devices described above.
  • These geometries and / or material compositions, for which determination results are available can be different from the specified geometry and / or composition.
  • FIG. 1 shows a production line for continuous drawing
  • FIG. 2 shows a method known from the prior art for measuring the pulling force
  • Figure 3 - a schematic illustration of contributions to the pulling force in or on a manufacturing mold
  • FIG. 4 an illustration of a variant of the concept according to the invention
  • FIG. 5a shows a device according to the invention
  • Figure 5b - a section of a variant of the device according to Figure 5a in a longitudinal section
  • Figure 8 - a flowchart of an embodiment example of a method according to the invention.
  • Figure 1 shows an exemplary production line 10 for the production of profiles by means of extrusion.
  • the production line 10 has a creel or fiber rack 11, fiber guides 12, an impregnation device 13, guides 14 for the impregnated fiber strand or the impregnated fiber strands, which can simultaneously serve the preforming, a heated production mold 15, a pulling device 16 and a cutting device 17 , for example saws, to cut the manufactured profiles.
  • Extrusion is a continuous process to produce profiles with a particularly constant cross section from composite material.
  • fibers 18 are drawn individually, in strands, as a band, fabric and / or mat and / or other or other textile shapes through an impregnation device 13, where they are impregnated with a matrix material, in particular synthetic resin. About excess matrix material can be removed from the impregnated fibers 18 in a guide 14 to form before.
  • the matrix material-impregnated fibers 18 are drawn through a heated production mold 15 in order to harden the matrix material in the production mold 15. The matrix material can polymerize to form a solid composite profile with the fibers 18.
  • the pulling force exerted by the pulling device to overcome the sum of the forces is a secondary parameter, which of the primary parameters, such as about the fiber tension, the drawing speed, temperature profile in the manufacturing mold 15, the manufacturing mold geometry and the surface roughness, the ratio of fibers to the volume of the manufacturing mold cavity, the initial resin viscosity, the pressure in the mold, the course of resin curing, chemical shrinking, thermal Expansion etc. depends.
  • pulling force is a secondary parameter, analyzing pulling force is critical to understanding and controlling the drawing process. The process stability and the properties of the extruded composite materials can depend on the pulling force.
  • FIG. 2 shows an example of how, in the prior art, the sum of the forces which arise in connection with the manufacturing mold 15 and contribute to the pulling force is determined experimentally by a force sensor or force transducer 20 between a stationary frame 21 and a slide-bearing manufacturing mold 15 is used.
  • FIG. 2 shows a slide bearing 22, which stores the production mold 15 in the drawing direction R, the production mold 15 and a section of the strand 23 made of fibers 18 and matrix material.
  • the force transducer 20 the sum of the individual forces on the manufacturing mold 15 is determined when the manufacturing mold 15 is pressed against the force transducer 20 due to the pulling on the strand 23 by the manufacturing mold 15.
  • the individual contributions to the force which come from the production mold 15 cannot be determined separately from one another, at least not without considerable experimentation effort.
  • Figure 3 illustrates various resistance forces, which during the pulling in or on the Production form 15 occur.
  • the drawing force (F drawing) must be applied to overcome the sum of individual forces.
  • F drawing To the total force F as the n- Zusairme in Figure 3 guidance denoted force contributes which is ent in the portion of the production line 10 by including the creel 11, the guides 12, 14, the impregnation device. 13
  • the production mold 15 can have an inlet 19 which tapers in the direction of drawing.
  • a force F Ve rdichtung occurs, for example, by compacting or compressing the strand 23 at or in the entrance 19 of the forming mold 15.
  • the system for determining the sum of the forces on the manufacturing mold 15, ie, the sum of the forces F compaction, Fviskostician and F friction ung, as shown in Figure 2 using the force on taker 20 is a system for the continuous Measurement, which is implemented in a complete production line 10. From the properties of the continuous drawing process to be a continuous and linear process, it follows that changes in the parameters in order to optimize the process often require retrofitting or re-equipping the production line 10 and are therefore complex. The determination of the pulling force by means of the force transducer 20, as shown in FIG. 2, does not simply leave the components of the individual alone Determine power contributions that occur within the manufacturing form 15.
  • the invention is based on the desire to overcome the above-mentioned disadvantages.
  • the inventive idea is to transform the linear extrusion process into a rotation process.
  • the function “force as a function of position or location” in production form 15 is transformed into the function “torque as function of time” (see FIG. 4) in test form 25.
  • This can be expressed by the relationship: F (l) -> M (t).
  • Figure 4 illustrates this.
  • FIG. 4 shows a strand 23 in a production mold 15 and a rotating mandrel 24 (also called mandrel, can also be referred to as a spindle, shaft or core) in an experimental mold 25
  • Reinforcing fibers 18 is arranged.
  • the equivalents to the forces, which in total have to be compensated by the pulling force, can be studied without any time restrictions. Values for determining the individual force contributions in the sections of the production form can be determined in succession in one process run.
  • FIG. 5a schematically shows an example of a device 30 according to the invention, by means of which a method 100 according to the invention can be carried out.
  • FIG. 5b shows a section of a variant of the device 30 according to FIG. 5a in a longitudinal sectional view.
  • the device 30 has the experimental form 25, which delimits an interior space (see FIG. 5b).
  • the shape 25 points in the longitudinal direction (axial direction) in the area in which the shape receives a preform 26, preferably a constant cross section. Alternatively, the cross-section and / or the size of the area in the mold 25 may vary.
  • the shape 25 preferably has a radial dimension in the area in which it receives a preform 26, which is constant in all radial directions.
  • the inner circumferential surface of the mold 25, which is in contact with the preform 26, is preferably essentially cylinder-shaped, so that the mold 25 can essentially delimit a cylindrical interior.
  • the mold 25 or the inner surface thereof can consist of the same material as a production mold 15, which can be used in a production line 10, and / or can, for example, have a comparable surface quality.
  • Mandrel 24 in the form 25 is arranged.
  • Mandrel 24 and form 25 are preferably coaxial.
  • the mandrel 24 may have a substantially cylindrical shape.
  • the shape 25 and the mandrel 24 delimit a gap 31 for receiving the preform 26.
  • the gap 31 is preferably jacket-shaped, particularly preferably cylindrical jacket wall-shaped, and preferably completely surrounds the mandrel 24.
  • the gap 31 between the surface of the mandrel 24 without the preform 26 and the inner surface of the mold 25 represents the thickness of the strand in the manufacturing mold 15.
  • the adhesive and / or Reibver hold against the shape 25 is to be determined.
  • resin-impregnated fibers 18, for example in the form of a strand can be applied.
  • the fibers 18 can in particular occupy a band-shaped space.
  • the fibers 18 are applied in an orderly manner to the mandrel.
  • the resin impregnated fibers are, for example, placed around the mandrel 24 or wound on the mandrel 24.
  • the fibers 18 preferably extend essentially along the circumferential direction of the dome 24.
  • the device 30 has mechanical seals (dynamic seals), for example mechanical seals 32, for sealing the gap 31 between the mandrel 24 and the mold 25 to the outside.
  • mechanical seals dynamic seals
  • mechanical seals 32 for sealing the gap 31 between the mandrel 24 and the mold 25 to the outside.
  • the mold 25 is fixed in rotation in a heating block 33, which serves to heat the mold 25.
  • a temperature sensor 34 is used to determine the temperature of the mold 25.
  • the mandrel 24 is driven by a motor 36 via a shaft arrangement 35.
  • the shaft arrangement 35 can have a gear 37.
  • a device 38 e.g. a transducer or a unit for determining the torque (drive torque), which the drive from the motor 36 and transmission 37 exerts on the mandrel 24. This depends on the viscous friction and / or solid friction between the preform 26 and the form 25 and / or on an adhesive interaction between the preform 26 and the form 25, which adhesive interaction can exist in particular due to the matrix material.
  • the torque can be up to 100 Nm, for example.
  • the device 10 has a device 39 for determining the speed of the mandrel 24.
  • the heating block 33 and the form 25 are attached to a stand 40.
  • An insulating plate 33a insulates the Heating block 33 thermally from the stand 40.
  • the stand 40 is able to support the torque which is exerted on the mold 25 or the heating block 33 by rotating the mandrel 24 and the preform 26 relative to the mold 25.
  • the heating block 33 and the form 25 remain when rotating the mandrel 24 with the preform 26 in the form 25 before preferably in an angular position relative to the frame 44 or the stand 40.
  • the heating block 33 and the form 25 who therefore preferably not turned.
  • a device 41 for determining the supporting torque is arranged between the heating block 33 and the stand 40, by means of which device 41 the heating block 33 is coupled to the stand 40.
  • the support torque can be determined from which the shape 25, in the example via the heating block 33, is supported on the stand 40.
  • the torque that has to be supported is transmitted by the rotation of the mandrel 24 from the mandrel 24 to the preform 26 and via the preform 26 to the mold 25 and from there to the heating block 33. That from the preform 26 to the mold 25 Torque transmitted can vary greatly with the device 30 over the course of the test process.
  • the stand 40 has a device 42 for height adjustment of the mold 25 or the heating block 33.
  • the The height is adjusted in the longitudinal direction of the central axis 43 of the shape 25, which preferably coincides with the axis of rotation of the mandrel 24 (see FIGS. 4 and 5b).
  • the device 42 for height adjustment which in the example is formed by scissors kinematics, serves to move the mandrel 24 and the mold 25 relative to one another. In particular, the mandrel 24 can thus be moved into the mold 25 relative to the mold 25.
  • the components of the device 30 are arranged in a frame 44 which supports the stator 40 and the motor 36 with the shaft arrangement 35 and the mandrel 24.
  • control system 45 of the device 30 includes a control device 46, which has a device 47 for powering the motor 36 to adjust the speed of the motor 36, and a measured value recording device 48, which is coupled to the control device 46 or is part thereof, and which data from the device 39 for determining the speed of the mandrel 24, the temperature sensor 34 and at least one of the devices 41, 38 for determining the Starting from the support torque or the drive torque or from both the device 41 for determining the support torque and the device 38 for determining the drive torque.
  • a unit for thermoregulation 49 which regulates the temperature in the heating block 33, can also be controlled by the control device 46.
  • the device 30 can have further devices for determining physical variables, for example a pressure sensor (not shown) for determining the pressure in the gap 31. The data of the further devices can also be recorded via the measured value recording device 48.
  • FIG. 8 represent block diagrams.
  • the embodiment of the method 100 according to the invention includes the step of arranging 101 a fiber / matrix material preform 26 (preform 26) between the rotating mandrel 24 and the mold 25.
  • the preform 26 can, for example, on the rotating mandrel 24 of the device according to figures 5a, 5b, 6 are applied.
  • the stand 40 can be moved down to a position (not shown) in which the mandrel 24 is arranged outside the mold 25.
  • the mandrel 24 is preferably uncoupled from the shaft arrangement 35 in order to apply the preform 26 to the mandrel 24.
  • the fibers which are provided with matrix material can first be wound onto the rotary mandrel 24.
  • the preform 26 can be composed, for example, of one or more strands of reinforcing fibers 18 which are impregnated with matrix material.
  • the preform 26 can contain textiles in the form of, for example, woven tapes or tapes made of felt material or other textile shapes.
  • the matrix material can, at least to a large extent, consist of synthetic resin, for example epoxy resin. In the matrix material may also contain additives or fillers.
  • Reinforcing fibers 18 in the preform 26 preferably have a length of at least the circumference of the mandrel 24 in order to be able to be wound around the mandrel 24 at least once.
  • the reinforcing material preferably consists of or has individual fibers 18 that are not intertwined or interwoven with one another.
  • the reinforcing material is preferably a strand of individual fibers 18 running alongside one another.
  • the reinforcing material can be placed around the mandrel 24 or wound.
  • the preform 26 can be applied to the rotating mandrel 24 by, for example, band-shaped strands being placed around the rotating mandrel, in particular wound onto the rotating mandrel, so that the fibers 18 and / or the strands preferably at least substantially in the circumferential direction tion of the rotating mandrel 24 extend.
  • a single continuous fiber or a group of a few continuous fibers can be wound as a strand on the mandrel 24 as a preform 26 until the desired preform thickness is reached. It is possible, for example, to apply pre-impregnated fibers 18 to the rotating mandrel 24 and / or to subsequently impregnate fibers 18 applied to the rotating mandrel 24.
  • Glass fibers for example, can be used as the reinforcing fiber material.
  • carbon fibers can be used.
  • other fibers for example polymer fibers, can be used.
  • the mandrel 24 can now be introduced into the mold 25 with the preform 26.
  • the mold 25 with the heating block 33 can be moved vertically into a position as shown in FIG. 5a by means of the scissors kinematics, the mandrel 24 with the preform 26 placed thereon immersed in the mold 25.
  • Figures 5a, b and 6 show a device in which the mold 25 itself is not rotatable relative to the stand 40 or the frame 44, but only the mandrel 24 is driven to perform a rotational movement relative to the mold 25 it is additionally or alternatively possible to rotatably support the mold 25 and to drive it.
  • a corresponding device (not shown) preferably has a device for determining the drive torque of the mold 25 and / or a device for determining the support torque of the mandrel 24.
  • the mandrel 24 and the mold 25 are rotated relative to one another by means of the motor 36 and the shaft arrangement 35 (step 102), while the mandrel 24 is arranged with the preform 26 in the mold 25.
  • the preform 26 preferably has the same angular velocity as the mandrel 24.
  • the fibers 18 on the mandrel 24 are preferably at rest relative to the mandrel 24.
  • Mandrel 24 and mold 25 are preferably rotated coaxially relative to one another.
  • the heating block 33 can, for example, be kept at a certain temperature or the temperature of the heating block 33 can be changed according to a function, in particular a linear function.
  • a temperature gradient can be generated in the preform 26.
  • the heat can penetrate radially inwards from the pair of surfaces comprising the inner mold surface and the outer preform surface. This can simulate conditions as they correspond to the conditions in a manufacturing mold 15, so that there is a temperature gradient from the surface of the strand 23 in the manufacturing mold 15 to the inside.
  • the matrix material By heating the matrix material, the matrix material can harden increasingly in more and more areas in the course of the experiment, the matrix material being able to change from a liquid to a gel-like and finally to a solid state by polymerization.
  • the Steuereinrich device 46 which regulates the speed of the mandrel 24, keeps the se preferably constant, despite polymerization, increase in pressure due to thermal expansion and thus potentially higher normal force on the friction surface and / or chemical shrinkage in the radial direction, which effects too strong un different friction behavior over the course of the experiment.
  • At least one value of the drive torque and / or the support torque at a specific point in time is recorded (step 103). From this, a force can be determined which contributes to the sum of the forces which must be compensated for in the production process by means of the production line 10 by the pulling device 16 in order to pull the strand 23 in the production line 10 at a constant speed through the production mold 15. This is because the conditions in test form 25 are so similar to those in production form 15 that the results of the method allow conclusions to be drawn about the behavior of the strand 23 can be drawn as a preform in the manufacturing mold 15.
  • the contribution to the pulling force can be determined who comes from a specific longitudinal section of the production mold 15, in particular in the same or similar conditions, as when recording the value in the method according to the invention.
  • the specific point in time at which the value is recorded can be converted into a specific position or a specific longitudinal section in a production mold 15.
  • the behavior, in particular the adhesive and friction behavior, of a strand 23 in at least one section of the production mold 15 can be simulated.
  • the drive torque and / or the support torque is particularly preferably recorded over time (step 103 ').
  • the matrix material for example synthetic resin, polymerizes and / or crystallizes over time due to the action of heat. Over the course of the test, there are different conditions (e.g. degree of curing, degree of polymerization and / or degree of crystallization of the synthetic resin, pressure of the matrix material as, temperature of the preform 26, etc.), which in the production mold 15 ( Figure 1) ratios in various Longitudinal sections of the manufacturing mold 15 can correspond.
  • the drive torque and / or the support torque are recorded over time (see for example FIG. 7, which shows the support torque over time)
  • the Temporal moment curve into a force curve, force as a function of the position in the manufacturing mold 15 in the conveying direction can be converted (step 104).
  • a course of the torque as a function of time can be determined, for example, as shown in FIG. 7.
  • the diagram shown in Figure 7 shows the course of the torque over time at constant speed of the mandrel 24 with a 1 millimeter thick preform 26 made of glass fibers as Ver reinforcing material and epoxy resin as the matrix material during curing.
  • the sharp increase in torque over the course of the test test can be explained by a pressure increase during the thermal expansion of the composite material and by the transition from internal to external friction during the transition from the liquid phase of the synthetic resin to the gel phase of the synthetic resin.
  • the sharp drop in torque can be explained by a shrinkage of the molding due to the hardening of the resin, at which the pressure and thus the normal force between the surface of the mold 25 and the preform 26 decrease.
  • the result of the determination from the test attempt can flow into the design or the establishment of a manufacturing process by defining a parameter of the manufacturing process based on the result of one or more test attempts (method 104).
  • Parameters of the manufacturing process can be, for example, the length of the manufacturing mold 15, the composition of the preform or strand 23 and / or the product, the temperature, the temperature profile in the manufacturing mold 25 and / or the drawing speed.
  • parameters e.g. Composition of the preform or strand 23, properties of the mold 15, for example material or surface texture, temperature, temperature profile, drawing speed, which can be calculated into a rotational speed, etc.
  • properties of the mold 15 for example material or surface texture, temperature, temperature profile, drawing speed, which can be calculated into a rotational speed, etc.
  • individual parameters can be identified and optimized, such as the temperature profile of the production mold 15, the surface roughness and the material of the production mold 15, the fibers 18 and the volume fraction of the fibers, the matrix material, in particular the resin system, additives, speed of the process, geometry of the composite profile, which influence the extrusion process, without a complete extrusion line 10 being required.
  • the process only uses a fraction of the material needed for a continuous drawing process. This makes the process particularly material and cost-saving.
  • the production mold 15 is one of the largest cost drivers.
  • the test form 25 for the test attempt is generally smaller than a production form 15 in a production line 10, which is designed by means of the test test - the device 100 according to the invention and the invention Methods 100, 104 therefore also have a great economic advantage.
  • the method 100 for determining the behavior 100 and the method for determining at least one parameter of the production process 104 can also be regarded as an overall method.
  • One or more results from the determination of the behavior by means of at least one test test can be stored in a database of a system (not shown) for production by means of continuous drawing and / or for production planning.
  • the system can have an input device and a determination device, the system being set up in such a way that a user of the system can use the input device to specify a geometry and / or a composition of a fiber / resin preform and / or a product and the Determining device at least one production parameter based on the result or the results, which are accessible via the database and which have been determined, in particular calculated, from behavior determined by means of a device 30 according to the invention and / or by a method 100, 104 according to the invention.
  • the at least one production parameter can be determined, for example, on the basis of geometries and / or compositions of preforms 26 and / or products, for which determination results are determined in the database by means of one of the methods 100, 104 or devices 30 described above and which differ from the given geometry and / or composition.
  • the method 100 has the application of a fiber / plastic preform 26 to a rotating mandrel 24 and the introduction 102 of the mandrel into a heated test mold 25 (step 101).
  • Form 25 and mandrel 26 are rotated relative to one another (step 102) and at least one value of the drive torque and / or the support torque is recorded (step 103).
  • a parameter of a production process in a production line 10 for extruding can be determined.

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  • Moulding By Coating Moulds (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer le comportement adopté par des plastiques renforcés par des fibres pendant leur fabrication. Le résultat de la détermination permet de déduire le comportement des plastiques renforcés par des fibres pendant leur fabrication au cours d'un processus d'extrusion par étirage. Selon des modes de réalisation du procédé selon l'invention (100), le procédé (100) consiste à appliquer une ébauche préformée en fibres/plastique (26) sur une broche de rotation (24) et à introduire (102) la broche dans un moule d'essai chauffé (25) (étape 101). Le moule (25) et la broche (26) sont mis en rotation l'un par rapport à l'autre (étape 102), et au moins une valeur du couple d'entraînement et/ou du couple d'appui est enregistrée (étape 103). Un paramètre d'un processus de production dans une chaîne de fabrication (10) permettant l'extrusion par étirage peut être déterminé au moyen de ladite valeur.
EP19798050.1A 2018-11-05 2019-10-31 Procédé de détermination du comportement de plastiques renforcés par des fibres pendant la fabrication, dispositif et installation Pending EP3877162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018127540.4A DE102018127540B4 (de) 2018-11-05 2018-11-05 Verfahren zur bestimmung des verhaltens von faserverstärkten kunststoffen während der herstellung, vorrichtung und anlage
PCT/EP2019/079898 WO2020094505A1 (fr) 2018-11-05 2019-10-31 Procédé de détermination du comportement de plastiques renforcés par des fibres pendant la fabrication, dispositif et installation

Publications (1)

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EP3877162A1 true EP3877162A1 (fr) 2021-09-15

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Application Number Title Priority Date Filing Date
EP19798050.1A Pending EP3877162A1 (fr) 2018-11-05 2019-10-31 Procédé de détermination du comportement de plastiques renforcés par des fibres pendant la fabrication, dispositif et installation

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Country Link
EP (1) EP3877162A1 (fr)
DE (1) DE102018127540B4 (fr)
WO (1) WO2020094505A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4783301A (en) * 1986-10-30 1988-11-08 The Dow Chemical Company Polybutene molded article and method for making same
US6132866A (en) * 1998-01-28 2000-10-17 E. I. Du Pont De Nemours And Company Yarn blend for friction applications
DE102014222846A1 (de) * 2014-11-10 2016-05-12 Volkswagen Aktiengesellschaft Verfahren zum mittels Pultrusion Herstellen von Faserverbundstoffprofilteilen sowie Faserverbundstoffprofilteil

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DE102018127540B4 (de) 2021-02-04
WO2020094505A1 (fr) 2020-05-14
DE102018127540A1 (de) 2020-05-07

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