Defining Allowable Physical Property Variations for High Accurate Measurements on Polymer Parts.

Ali Mohammadi, Mads Rostgaard Sonne, Daniel González Madruga, Leonardo De Chiffre, Jesper Henri Hattel

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    Abstract

    Measurement conditions and material properties have a significant impact on the dimensions of a part, especially for polymers parts. Temperature variation causes part deformations that increase the uncertainty of the measurement process. Current industrial tolerances of a few micrometres demand high accurate measurements in non-controlled ambient. Most of polymer parts are manufactured by injection moulding and their inspection is carried out after stabilization, around 200 hours. The overall goal of this work is to reach ±5μm in uncertainty measurements a polymer products which is a challenge in today‘s production and metrology environments. The residual deformations in polymer products at room temperature after injection molding are important when micrometer accuracy needs to be achieved. Numerical modelling can give a valuable insight to what is happening in the polymer during cooling down after injection molding. In order to obtain accurate simulations, accurate inputs to the model are crucial. In reality however, the material and physical properties will have some variations. Although these variations may be small, they can act as a source of uncertainty for the measurement. In this paper, we investigated how big the variation in material and physical properties are allowed in order to reach the 5 μm target on the uncertainty.
    Original languageEnglish
    Title of host publicationAIP Conference Proceedings
    Number of pages5
    Volume1738
    PublisherAIP Publishing LLC
    Publication date2015
    ISBN (Print)978-0-7354-1392-4
    DOIs
    Publication statusPublished - 2015
    Event13th International Conference of Numerical Analysis and Applied Mathematics 2015 (ICNAAM 2015) - Rhodes, Greece
    Duration: 22 Sept 201528 Sept 2015
    http://icnaam.org/

    Conference

    Conference13th International Conference of Numerical Analysis and Applied Mathematics 2015 (ICNAAM 2015)
    LocationRhodes,
    Country/TerritoryGreece
    Period22/09/201528/09/2015
    Internet address
    SeriesA I P Conference Proceedings Series
    Volume1738
    ISSN0094-243X

    Keywords

    • Finite Element Analysis
    • Thermo-mechanical Model
    • Uncertainty Budgeting

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