DE102011082842A1 - Method for manufacturing fiber structure component i.e. carbon fiber component, in resin transfer molding tool in e.g. automobile industry, involves making viscosity of matrix material to be constant during introducing material in tool - Google Patents

Method for manufacturing fiber structure component i.e. carbon fiber component, in resin transfer molding tool in e.g. automobile industry, involves making viscosity of matrix material to be constant during introducing material in tool

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Publication number
DE102011082842A1
DE102011082842A1 DE201110082842 DE102011082842A DE102011082842A1 DE 102011082842 A1 DE102011082842 A1 DE 102011082842A1 DE 201110082842 DE201110082842 DE 201110082842 DE 102011082842 A DE102011082842 A DE 102011082842A DE 102011082842 A1 DE102011082842 A1 DE 102011082842A1
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DE
Germany
Prior art keywords
matrix material
tool
viscosity
method according
characterized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE201110082842
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German (de)
Inventor
Sem Kasper
Armin Daniel
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.)
Frimo Group GmbH
Original Assignee
Frimo Group GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Frimo Group GmbH filed Critical Frimo Group GmbH
Priority to DE201110082842 priority Critical patent/DE102011082842A1/en
Publication of DE102011082842A1 publication Critical patent/DE102011082842A1/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28Shaping operations therefor
    • B29C70/40Shaping or impregnating by compression not applied
    • B29C70/42Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46Shaping 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
    • B29C70/48Shaping 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

Abstract

The method involves inserting a fiber blank in a resin transfer molding tool (1), and closing lower and upper tool halves (1a, 1b). Low-viscosity matrix materials of two components are mixed with each other, where the viscosity of the mixed matrix material is less than 500 mPas. The low-viscosity matrix material is introduced into the tool, where the viscosity of the matrix material is constant during the introduction of the low-viscosity matrix material in the tool. Temperature is maintained to be constant during the introduction of the matrix material into the tool.

Description

  • 1. Field of the invention
  • The present invention relates to a method for producing fiber structure components, in particular of fiber structure components with directed continuous fibers or so-called hybrid components with different fiber types, for example components made of CFRP. Such structural components are used, for example, in the automotive industry or in aviation technology.
  • 2. State of the art
  • In the prior art, a so-called RTM process (Resin transfer molding) with various variants is known. In the mass production of structural components classically such RTM methods are used to particular fiber structure components, such as CFRP components, with u. a. directed continuous fibers or hybrid fibers. Here, a fiber volume content of at least 40%, preferably from 50-60%, is always desired.
  • In the prior art, it is known to fill a tool in which a fiber blank is received, with high flow rates and high pressures. Such a method is known, for example, by the term "high-pressure resin transfer molding". The reason for using high flow rates and high pressures is that the viscosity of the matrix material used increases immediately after mixing. As a result, the matrix material can not be introduced indefinitely into the tool and used for impregnating the fiber blank. In addition, due to the high flow rates, the cycle time should be reduced by a short filling process.
  • However, these circumstances result in a high internal pressure within the tool. Furthermore, high closing forces are required to keep the mold halves closed.
  • For the production of such structural components presses are therefore used by default, which often apply more than 1000 tons of clamping force. Such presses in the field of injection molding have the disadvantage that the investment costs are on the one hand quite high, and these can not be readily integrated into a production line because of the lack of mobility.
  • Other methods, such. As the autoclave technology, are used for the production of small batches. From an economic point of view, such a technology is worthwhile, for example, for larger structural components in the aerospace industry. Due to the high manual manufacturing effort, however, such a method is not suitable for mass production in high quantities.
  • 3. Presentation of the invention
  • The present invention has been accomplished in order to solve the aforementioned problems, and it is an object of the present invention to provide a process for producing fiber structure components, which can eliminate the use of high-clamping force presses and thus reduce manufacturing costs know.
  • For this purpose, the present invention provides a method according to claim 1. Further preferred embodiments can be found in the dependent claims.
  • Conventional presses with high closing forces are no longer needed with the method according to the invention, which leads to lower investment costs. Furthermore, however, a high degree of automation can be maintained. Within the device used only low internal pressures for injection and possibly repressions are required. By using a low-viscosity thermoset material still relatively short cycle times can be achieved.
  • The degree of viscosity is, for example, after DIN 53211 certainly. The matrix material can be filled in a temperature range RT (room temperature) <about 160 ° C in a already equipped with a fiber blank tool, and preferably maintains the viscosity during the entire filling process largely. In this case, in particular the temperature is kept substantially constant during a filling process.
  • The present invention provides a method for producing a fiber structure component in a tool, which tool has a lower and an upper mold half, with the steps: inserting a fiber blank into the tool, closing the mold halves, mixing a low-viscosity, in particular thermosetting, Matrix material and then introducing a matrix material in the tool.
  • Since the matrix material has a low viscosity when introduced into the tool, the tool can be filled more slowly than is possible with the known higher-viscosity materials. For these higher-viscosity materials is to ensure that the matrix material in a short enough time in a tool passes and the Inlaid fiber blank soaks without forming trapped air. This requires relatively high pressures, which are avoided in the context of this invention.
  • Preferably, after the introduction of the matrix material, a reprinting is applied by means of a pressure medium, wherein the reprinting is introduced in particular via that inlet opening through which the matrix material also enters the tool. By applying the reprinting, the matrix material is compressed again and the tool is freed from air inclusions. To avoid air residues in the tool therefore riser systems can be provided.
  • In a variant of the method it can be provided that the reaction start of the matrix material, in which the viscosity changes and the matrix material hardens, is adjustable. For setting, for example, the temperature prevailing during filling, determined according to the duration of the filling process, so that after its completion, the matrix material in a relatively short time (for example, 20-30 seconds) hardens.
  • It is intended that the viscosity change abruptly after completion of the filling process. In order to keep the cycle time as low as possible, the reaction should start as soon as possible after completion of the filling process. For this purpose, the prevailing during the filling process temperature can be selected accordingly. For example, the tool is filled at a constant temperature in the range of RT about 160 ° C., more preferably 70-90 ° C. Then the material hardens after completion of the filling process, which is purely exemplary for about 4-5 minutes, relatively quickly after about 20-30 seconds.
  • With regard to the viscosity of the matrix material, it is preferred that this is less than 500 mPas, more preferably 300 mPas and particularly preferably 200 mPas. Since the temperature during the filling process is preferably kept constant, and the matrix material used has properties according to which the viscosity does not change or changes only slightly over the time of the filling process, the values mentioned are present until completion of the filling process.
  • Furthermore, it can be provided that the matrix material is introduced into the mold at 100 g / s, preferably at 30 g / s. The introduction of the matrix material is pressure-controlled, so that the pressure is kept constant. It is particularly preferred to keep the pressure less than 15 bar, in particular less than 10 bar. This has the advantage that lower retention forces must be provided on the tool.
  • 4. Brief description of the drawings
  • 1 shows a schematic representation of an apparatus for the production of structural components with a method according to the present invention.
  • 5. Detailed Description of the Preferred Embodiment
  • With reference to the apparatus described below, the inventive method will be explained purely by way of example.
  • In 1 is an RTM tool 1 with a lower mold half 1a and an upper tool half 1b shown. Between the upper and lower mold halves 1a and 1b is cavity 2 formed, in which a component blank (not shown) is inserted. This component blank has fibers, in particular directed fibers or a so-called hybrid fiber blank.
  • On the tool 1 is a tool jig system 3 provided by which a low-viscosity matrix material is introduced. At the tool feeder system 3 is a reprint unit 4 connected to a port for a print medium 5 having. Furthermore, at a reprint unit 4 a mixing head 6 connected.
  • In operation, a structural blank of a fibrous material between the tool halves 1a . 1b inserted, and these closed. Excluding a low-viscosity matrix material from the mixing head in the reprinting unit 4 brought in. The viscosity of the matrix material is kept substantially constant throughout the filling process.
  • For injection of the matrix material is a valve for connecting the pressure medium 5 open, and between the tool halves 1a . 1b Inlaid fibers impregnated. To compensate for the volume loss during cooling and curing of the matrix material is introduced by the Nachdrückeinheit additional matrix material under application of pressure. Furthermore, riser systems prevent cavities during impregnation of the structural part blank.
  • Due to the low viscosity of the matrix material (viscosity of both components is about 200 mPas or less), the injection pressures and the restraining forces to be applied to the tool are relatively low. After the low-viscosity matrix material penetrates well between the fibers of the structural component and then hardens, the finished structural component can be removed from the tool 1 be removed.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited non-patent literature
    • DIN 53211 [0010]

Claims (10)

  1. Method for producing a fibrous structural component in a tool ( 1 ), a lower and an upper mold half ( 1a . 1b ), comprising the steps of: - inserting a fiber blank into the tool ( 1 ), - closing the tool halves ( 1a . 1b ), - Mixing a low-viscosity matrix material of at least two components, wherein the viscosity of the mixed matrix material is preferably less than 500 mPas, and then - introducing the low-viscosity matrix material into the tool ( 1 In particular, the viscosity of the matrix material remains substantially constant during the introduction.
  2. A method according to claim 1, characterized in that the temperature during the introduction of the matrix material into the tool ( 1 ) is kept substantially constant.
  3. A method according to claim 1 or 2, characterized in that a reaction start of the matrix material is adjustable, in particular by selecting the temperature during the introduction of the matrix material.
  4. A method according to claim 1, characterized in that the viscosity of the mixed matrix material is less than 300 mPas.
  5. A method according to claim 4, characterized in that the viscosity of the mixed matrix material is less than 200 mPas.
  6. Method according to one of the preceding claims, characterized in that the introduction of the matrix material takes place at 20 to 100 g / s.
  7. A method according to claim 6, characterized in that the introduction of the matrix material takes place at 20 to 30 g / s, in particular at substantially 30 g / s.
  8. Method according to one of the preceding claims, characterized in that the introduction of the matrix material is pressure-controlled, wherein the pressure is kept constant.
  9. A method according to claim 8, characterized in that the pressure for introducing the matrix material is kept smaller than 15 bar.
  10. A method according to claim 8, characterized in that the pressure for introducing the matrix material less than 10 bar, in particular between 8 and 10 bar is maintained.
DE201110082842 2011-09-16 2011-09-16 Method for manufacturing fiber structure component i.e. carbon fiber component, in resin transfer molding tool in e.g. automobile industry, involves making viscosity of matrix material to be constant during introducing material in tool Withdrawn DE102011082842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201110082842 DE102011082842A1 (en) 2011-09-16 2011-09-16 Method for manufacturing fiber structure component i.e. carbon fiber component, in resin transfer molding tool in e.g. automobile industry, involves making viscosity of matrix material to be constant during introducing material in tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110082842 DE102011082842A1 (en) 2011-09-16 2011-09-16 Method for manufacturing fiber structure component i.e. carbon fiber component, in resin transfer molding tool in e.g. automobile industry, involves making viscosity of matrix material to be constant during introducing material in tool

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DE102011082842A1 true DE102011082842A1 (en) 2013-03-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112311A1 (en) * 2014-08-27 2016-03-03 Deutsches Zentrum für Luft- und Raumfahrt e.V. Method and mold for infusing a matrix material

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331267A1 (en) * 1988-03-01 1989-09-06 Stamicarbon B.V. Process for the preparation of composite materials
DE69607445T2 (en) * 1995-12-18 2000-11-23 Aerospatiale Matra Process for the manufacture of a composite article by transfer injection molding of synthetic resin (R.T.M.) and the article produced thereby
EP1197309A1 (en) * 2000-10-04 2002-04-17 Alcan Technology &amp; Management AG Method of manufacturing fibre reinforced composite structural elements
DE69531443T2 (en) * 1995-01-03 2004-04-08 The Boeing Co., Seattle Transfer casting process with filled honeycomb core
DE60203425T2 (en) * 2001-01-29 2006-02-02 Constructions Industrielles de la Méditerranée C.N.I.M. Reinforced elastomeric sheet-like mechanical workpiece, method and mold for its manufacture
DE102008023629A1 (en) * 2008-05-15 2009-11-19 Mt Aerospace Ag Integral hollow component made of fiber composite plastic
DE102010022508A1 (en) * 2010-06-02 2011-01-27 Daimler Ag Fiber composite component manufacturing method, involves inserting fiber blank into mold cavity, and heating mold cavity up to predetermined temperature to harden matrix material after completion of matrix material injection
DE102010010802A1 (en) * 2010-03-09 2011-09-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for manufacturing fiber reinforced polymer mold part that is utilized for manufacturing e.g. bumper in automobile industry, involves transferring preform part into tool, and hardening preform part in tool to form finished part

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0331267A1 (en) * 1988-03-01 1989-09-06 Stamicarbon B.V. Process for the preparation of composite materials
DE69531443T2 (en) * 1995-01-03 2004-04-08 The Boeing Co., Seattle Transfer casting process with filled honeycomb core
DE69607445T2 (en) * 1995-12-18 2000-11-23 Aerospatiale Matra Process for the manufacture of a composite article by transfer injection molding of synthetic resin (R.T.M.) and the article produced thereby
EP1197309A1 (en) * 2000-10-04 2002-04-17 Alcan Technology &amp; Management AG Method of manufacturing fibre reinforced composite structural elements
DE60203425T2 (en) * 2001-01-29 2006-02-02 Constructions Industrielles de la Méditerranée C.N.I.M. Reinforced elastomeric sheet-like mechanical workpiece, method and mold for its manufacture
DE102008023629A1 (en) * 2008-05-15 2009-11-19 Mt Aerospace Ag Integral hollow component made of fiber composite plastic
DE102010010802A1 (en) * 2010-03-09 2011-09-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for manufacturing fiber reinforced polymer mold part that is utilized for manufacturing e.g. bumper in automobile industry, involves transferring preform part into tool, and hardening preform part in tool to form finished part
DE102010022508A1 (en) * 2010-06-02 2011-01-27 Daimler Ag Fiber composite component manufacturing method, involves inserting fiber blank into mold cavity, and heating mold cavity up to predetermined temperature to harden matrix material after completion of matrix material injection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIN 53211

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112311A1 (en) * 2014-08-27 2016-03-03 Deutsches Zentrum für Luft- und Raumfahrt e.V. Method and mold for infusing a matrix material

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