Improving the paintability of sheet molding compounds for high volume production

Research output: Types of ThesisDoctoral thesis

Contributors

Abstract

Sheet Molding Compounds (SMC) present a promising alternative for sheet metal in automotive exterior body panel applications. They offer excellent specific mechanical properties, improved design freedom and a cost-efficient manufacturing process. However, the paintability of SMCs is challenging and this issue has kept the material from a more widespread application, in spite all inherent advantages. This work investigates the underlying reasons of paint defect occurrence and proposes novel solutions to improve upon state-of-the-art technology. Through the modification of conventional SMC an improved surface compound is proposed. This can be combined with a novel manufacturing process, denoted Co-Compression-Molding, which enables the molding of two individual compounds in a single step. The work offers insight into appropriate molding parameter selection to ensure a flawless compression molding process. Additional processing steps are proposed to further improve manufacturing, such as thermography for the early detection of sub-surface voids, and post-processing via electron beam curing.

Details

Original languageEnglish
Qualification levelDr.-Ing.
Awarding Institution
Supervisors/Advisors
  • Modler, Niels, Supervisor
  • Vaidya, Uday, Reviewer, External person
  • Täger, Olaf, Reviewer, External person
Thesis sponsors
  • Volkswagen AG
Defense Date (Date of certificate)25 Feb 2022
Print ISBNs978-3-86780-708-1
Publication statusPublished - 24 Jun 2022
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Keywords

Keywords

  • Lightweighting, Polymers, Composites, Automotive, Leichtbau, Kunststofftechnik, Faserverbundwerkstoffe, Automobilindustrie