Application of vacuum-assisted high-pressure RTMprocess for the series production of CFRP components for car bodies
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1 Application of vacuum-assisted high-pressure RTMprocess for the series production of CFRP components for car bodies Composites Europe 2013 Dipl.-Ing. Markus Geier Copyright by Schuler SMG Source BMW AG, Schuler AG 1
2 SCHULER SMG the company SCHULER SMG is member of the ANDRITZ Group SCHULER is the technological and world-market leader in forming technology SCHULR SMG is a system supplier for hydraulic presses and press lines with the brands SMG, Hydrap and Müller Weingarten 2
3 Overview of presentation Motivation for the use of CFRP parts in the automotive industry The vacuum-assisted high pressure RTM press process Press technology for the high pressure RTM process with example of supplied presses 36,000 kn 3.6 x 2.4 m System overview of complete RTM process New development of press technology 3
4 Light weight design in the automotive industry - Motivation Future of mobility Energy costs will rise Fuel consumption and emmissions will be increasingly financially punished. Laws concerning emissions influence mobility (E- mobility, etc.) For development of new vehicles there is a challenge of balancing safety, efficiency (environment) and joy of driving Efficiency (environment) car Vehicle concept Component function Choice of material Joy of driving Safety 4
5 CFRP unidirectional Steel Aluminum CFRP Quasi-isotropic Light weight design in the automotive industry - Potential Potential of various materials with regard to light weight design Source: Audi AG 5
6 Overview of presentation Motivation for the use of CFRP parts in automotive industry The vacuum-assisted high pressure RTM press process Press technology for the high pressure RTM process with example of supplied presses 36,000 kn 3.6 x 2.4 m System overview of complete RTM process New development of press technology 6
7 Press processes for fiber reinforced plastic Long fibers < 50 mm arbitrary fiber Thermosetting plastics SMC / D-SMC Thermoplastics GMT / LFT / LFT-D Endless fibers > 50 mm Dedicated fiber orientation e.g. deck lid, bumper RTM / HP-RTM e.g. passenger cell, roof e.g. spare wheel well, front end Organic sheet e.g. seat shell, front end Source: BMW AG and BASF 7
8 The vacuum assisted high pressure RTM press process Preform placement Press closing, start apply vacuum Resin injection, with position control Curing with compression force Force up to kn 8
9 The vacuum assisted high pressure RTM press process Mold opening Press opening Unload part Mold cleaning Mold break open force Up to kn 9
10 Overview of presentation Motivation for the use of CFRP parts in automotive industry The vacuum-assisted high pressure RTM press process Press technology for the high pressure RTM process with example of supplied presses 36,000 kn 3.6 x 2.4 m System overview of complete RTM process New development of press technology 10
11 CFRP sample parts produced on Schuler presses BMW i3 passenger cell BMW M3 roof Source: BMW AG, 11
12 Requirements for the RTM press Uniform wall thickness of the pressed part Maintaining of resin injection position for gap-injection Minimizing of non-productive time for mold cleaning / handling Reliable media supply to the molds Short pressure build-up and efficient energy use 12
13 Requirements for the RTM press Uniform wall thickness of the pressed part Press statics with congruent bending lines of slide and table Parallelism of slide to table also at high eccentric load 13
14 Press design with congruent bending lines Traditional design Design with congruent bending lines Raising deviation of bending lines Wall thickness non-uniform Uniform wall thickness 14
15 Requirements for the RTM press Uniform wall thickness of the pressed part Press statics with congruent bending lines of slide and table Parallelism of slide to table also at high eccentric load 15
16 Hydraulic slide parallelism control Eccentric load for the slide results from the process Non-symmetric part geometry = eccentric center of force load The liquid / pasty-like resin compound flows arbitrarily, when closing the mold Mold Press frame Counter-acting parallelism control cylinders Center of force load 16
17 Requirements for the RTM press Uniform wall thickness of the pressed part Maintaining of resin injection position for gap-injection Minimizing of non-productive time for mold cleaning / handling Reliable media supply to the molds Short pressure build-up and efficient energy use 17
18 Maintaining injection position of the slide Resin injection with slide position control Task: Maintaining of injection position against rising internal resin pressure and rising eccentrical load. F at injection up to kn Cavity pressure Solution: Closed-loop control for position + parallelism with set value position of parallelism cylinders and actuating value slide force 18
19 Requirements for the RTM press Uniform wall thickness of the pressed part Maintaining of resin injection position for gap-injection Minimizing of non-productive time for mold cleaning / handling Reliable media supply to the molds Short pressure build-up and efficient energy use 19
20 Design with 2 moving bolsters Two lower molds and one shared upper mold Part loading and unloading during the secondary processing time Cleaning of the lower mold during the secondary processing time moving bolster 1 moving bolster 2 free position for bolster 2 20
21 Requirements for the RTM press Uniform wall thickness of the pressed part Maintaining of resin injection position for gap-injection Minimizing of non-productive time for mold cleaning / handling Smooth mold opening Reliable media supply to the molds Short pressure build-up and efficient energy use 21
22 Requirements for the RTM press Uniform wall thickness of the pressed part Maintaining of resin injection position for gap-injection Minimizing of non-productive time for mold cleaning / handling Reliable media supply to the molds Short pressure build-up and efficient energy use 22
23 Short pressure build-up time and efficient energy use Accumulator drives Charging pumps continuously charge with low power Temporarily a high volume flow with nominal pressure is available for a working speed of 30 mm/s at kn Charging pump units 2 x 55 kw Noise < 75 db(a) 23
24 Overview of presentation Motivation for the use of CFRP parts in automotive industry The vacuum-assisted high pressure RTM press process Press technology for the high pressure RTM process with example of supplied presses 36,000 kn 3.6 x 2.4 m System overview of complete RTM process New development of press technology 24
25 System overview complete HP-RTM process From carbon fiber mats to a finished part Preforming HP-RTM Material magazine Stack production Handling Handling Trimming of finished part Trimming of Fiber mats Heating Trimming of preform Mixture and dosage technology 25
26 System overview complete HP-RTM process Technology partners Schuler and Frimo Provision of garments Production of preform Trimming of preform Handling of preform RTM- press RTM-mold Mixing / Dosage technology Handling of cured part Machining of cured part 26
27 Overview of presentation Motivation for the use of CFRP parts in automotive industry The vacuum-assisted high pressure RTM press process Press technology for the high pressure RTM process with example of supplied presses 36,000 kn 3.6 x 2.4 m System overview of complete RTM process New development of press technology 27
28 Short stroke press Function principle slide 4 mold press plate - Slide starts moving downwards (parallelism controlled) - Slide reached working position - Slide is locked by split nuts - Press plate starts movement upwards (parallelism controlled) - Working stroke with press plate from bottom 28
29 Short stroke press Parallelism control Two central positioned cylinders Individual setting of press force between cylinders Parallelism control integrated Bending line of press table can be influenced Congruent bending lines of press table and slide Four edge-positioned cylinders 29
30 Short stroke press Technical innovation Reduction of machine height Easy accessibility Integrated parallelism control Short pressure build up time Reduced energy consumption 30
31 Please visit us at our booth 6/D
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