Jill Urbanic - Academia.edu (original) (raw)

Papers by Jill Urbanic

Computer-aided Design and Applications, Mar 6, 2023

SAE technical paper series, Mar 28, 2017

The International Journal of Advanced Manufacturing Technology, Mar 17, 2018

The International Journal of Advanced Manufacturing Technology, Sep 1, 2016

The International Journal of Advanced Manufacturing Technology, Feb 8, 2019

The International Journal of Advanced Manufacturing Technology, Sep 27, 2018

Rapid Prototyping Journal, Mar 12, 2018

Purpose After experimental testing, it was recognized that a component’s strength relationship wi... more Purpose After experimental testing, it was recognized that a component’s strength relationship with respect to the volume material usage is inconsistent and that failures occurred in regions of voids. The purpose of this study is to present an optimal toolpath for a material extrusion process to minimize voids and discontinuities using standard parameters and settings available for any given machine. Design/methodology/approach To carry out this study, a literature review was performed to understand the influence of the build parameters. Then, an analysis of valid parameter settings to be targeted was performed for a commercial system. Fortus 400 machine build parameters are used for the case studies presented here. Optimal relationships are established based on the geometry and are to be applied on a layer-by-layer or sub-region basis and available machine build options. The component geometry is analyzed and decomposed into build regions. Matlab® is used to determine a standard (available) toolpath parameters with optimal variables (bead height, bead width, raster angle and the airgap) for each layer/build region. Findings It was found that the unwanted voids are decreased by up to 8 per cent with the new model. The final component will contain multiple bead widths and overlap conditions, but all are feasible as the available machine solutions are used to seed the model. Practical implications Unwanted voids can create failure points. Introducing an optimization solution for a maximized material fill strategy using existing build options will reduce the presence of voids and will eliminate “chimneys” or a void present in every layer of the component. This solution can be implemented using existing machine-toolpath solutions. Originality/value This study demonstrates that existing build settings and toolpath strategies can be used to improve the interior fill by performing targeted optimization strategies for the build parameters.

Springer eBooks, Sep 15, 2011

Distortion can be problematic when manufacturing components using the fused deposition modeling (... more Distortion can be problematic when manufacturing components using the fused deposition modeling (FDM) rapid prototyping process. The purpose of this research was to investigate the impact of geometric forms along with process parameters on part accuracy for the FDM process. Effective design and analysis in the virtual domain cannot be performed until the impact of component form and the fabrication strategies have on build accuracy are understood. A basic design of experiments was conducted to identify and quantify the effects of process parameters for distortion using components designed with simple geometric shapes containing thick wall and thin wall features. Flatness, perpendicularity and cylindricity were assessed. The effects of position of the part in the work envelop, layer thickness and orientation of the test models were studied. For the initial experiment, the part location impacted the variability of all the data. The interface design impacted the perpendicularity variations, but the concentricity was consistent. The experiment was extended to capture more insight with respect to different interface and thickness ratios. Significant variations related to perpendicularly and flatness was observed. These experiments illustrate that the form and feature interfaces directly impact the accuracy more than the process parameter variants. It is recommended to continue physical experimentation for more complex components in order to be able to predict and quantify potential issues.

Additive Manufacturing (AM) is the process of joining materials ‘layer by layer’ to make products... more Additive Manufacturing (AM) is the process of joining materials ‘layer by layer’ to make products from Computer Aided Design (CAD) model data. AM processes support faster product realization for a wide selection in industries. The Material Extrusion (ME) process is an AM process that builds a product from thin layers of extruded filaments from a semi-melted material such as a thermoplastic. In commercial systems, the software automatically generates the tool paths for both the model and any necessary supports, based on the curve geometry and the specified build parameters. The interior fill rotates 90° between each layer. Automatically generating the tool path can be the biggest weakness for this process planning strategy. Voids and discontinuities have been observed after evaluating test specimens developed to explore mechanical characteristics. Choosing an optimal raster orientation and bead width will help minimize voids and discontinuities in each layer. A mathematical model is introduced in this paper to find optimal raster orientation and bead widths based on the geometry of the slice for selected 2D extruded parts. As well, preliminary quality assessment metrics are introduced. Void analysis is performed to evaluate solution approaches, and the results compared. The future work will investigate utilizing multiple bead widths for a layer to minimize voids, and developing more comprehensive quality metrics to highlight problematic regions.

Computer-aided Design and Applications, Jan 21, 2019

This paper explores the work envelope and the work window for two 6 serial axis robot families us... more This paper explores the work envelope and the work window for two 6 serial axis robot families using a unified robot model. The work envelope, or workspace, represents all possible positions which may be occupied by a mechanism during its normal range of motion (for all positions). The work window is the reachable region for any given end effector orientation and is a subset of the work envelope. It is not intuitive to define, and when assessing feasibility strategies for process planning scenarios, needs to be readily determined for various kinematic configurations. A methodology to determine the reach feasibility of a desired configuration set is presented in this research. The unified model developed using Maple and Matlab is presented. Several examples are shown to demonstrate the affect of twist angles on to the shape of a robot work window. This important kinematic property needs to be used in cases of robot selection and as a tool design feature.

SAE International Journal of Materials and Manufacturing, Apr 5, 2016

Computer-aided Design and Applications, Jan 10, 2018

With the restriction of the diameter and feed direction of the cutting tool in milling process, e... more With the restriction of the diameter and feed direction of the cutting tool in milling process, electric discharge machining (EDM) is the only effective machining technology for the uncut regions with internal sharp corner. Automatic design of the electrode is of great significance for the CAD/CAM integration of EDM technology. In current CAD/CAM system the electrode design is done manually by technologists based on experience and knowledge. The procedure is tedious and timeconsuming. In this paper, a novel approach is proposed to automatically generate the electrode CAD model taking the topological vertices of uncut region as the hint. The hint feature points are innovatively defined and classified into three types: internal-sharp points, cutting-into points and interacting points. Based on this, our approach firstly determines the faces and the type of uncut region. Secondly, the interacting region is decomposed into the isolated region by reconstructing the topological structure, patching the split face and partitioning the shared face. Thirdly, the modeling parameters are extracted from the isolated region. Finally, the electrode CAD model is created by executing a set of generic modeling operations. The electrode CAD model can be directly used in the process planning, so as to promote the integration of CAD and CAM.