Mapping of GD&T information and PMI between 3D product models in the STEP and STL format

Beitrag in einer Fachzeitschrift

Details zur Publikation

Autorinnen und Autoren: Hallmann M, Götz S, Schleich B
Zeitschrift: Computer-Aided Design
Jahr der Veröffentlichung: 2019
Band: 115
Seitenbereich: 293-306
ISSN: 0010-4485


Increasing specialization of design,
manufacturing, assembly, and inspection have fostered the need for
sophisticated product documentation practices to allow the clear and
unambiguous communication of product information between design and all
downstream activities. This need has led to the development of various
standards for the exchange of product geometry and related information
and particularly to the emergence of STEP as a standard for the exchange
of product model data.

Though STEP is widely used as
an exchange format in design and related domains, other standards and
file formats are frequently used for transferring product geometry
information from design to downstream activities today, such as the STL (Standard Tesselation Language)
format, which uses a discrete geometry representation scheme for
describing part geometry by an unstructured triangulated surface.

there exists a gap between STEP, which offers great benefits regarding
the documentation of nominal product geometry and product manufacturing
information, and the STL format, which offers a discrete geometry
representation by triangles. With the aim to close this gap, this paper
presents a novel method that allows an automatic mapping of PMI (Product and Manufacturing Information) and GD&T (Geometric Dimensioning and Tolerancing)
information assigned on the CAD model from STEP files on discrete
geometries. The method comprises the interpretation of ISO STEP AP 242
files as well as a novel feature recognition approach. The combined data
model, that represents the geometry in tessellated format and includes
the GD&T information assigned on the triangulated features, may then
serve as an interface model between design, simulation, manufacturing,
and inspection and thus contributes to the consistency of product
documentation throughout the digital thread in the product life-cycle.
The applicability of the method is highlighted using a case study of a
car brake system of industrial complexity. In addition, its benefits are
underlined by the exemplary application of the method in the context of
injection molding simulation and tolerance analysis.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Götz, Stefan
Lehrstuhl für Konstruktionstechnik
Hallmann, Martin
Lehrstuhl für Konstruktionstechnik
Schleich, Benjamin Dr.-Ing.
Lehrstuhl für Konstruktionstechnik


Hallmann, M., Götz, S., & Schleich, B. (2019). Mapping of GD&T information and PMI between 3D product models in the STEP and STL format. Computer-Aided Design, 115, 293-306.

Hallmann, Martin, Stefan Götz, and Benjamin Schleich. "Mapping of GD&T information and PMI between 3D product models in the STEP and STL format." Computer-Aided Design 115 (2019): 293-306.


Zuletzt aktualisiert 2019-05-07 um 13:23