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Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing

Bhatia, Shaleen
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820498

Abstract Details

2014, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Additive Manufacturing (AM) is the process of producing 3D parts from a digital model in a layer by layer manner without the need for part specific tooling. Part material is typically a liquid that is photocured as in Stereolithography (SLA) or a powder that is sintered, as in Selective Laser Sintering (SLS) or Direct Metal Laser Sintering (DMLS). In this research a mathematical model of a typical DMLS machine is created to evaluate errors during additive manufacturing. This model incorporates machine error parameters to account for imperfections in machine linkages that cause these errors. The total machine error is modelled as two independent systems: the laser positioning error on the bed and the platform movement error along the z direction. The AM process is then simulated using a Virtual Manufacturing (VM) scheme to compute the actual geometry of the manufactured part for given AM process parameters. Part build orientation and location on manufacturing platform are the two process parameters that were considered in this VM process. Then cylindricity and flatness errors on this part are measured. The virtual manufacturing process is repeated for different values of layer thickness and different part location on the AM machine’s platform. These results are used to identify part orientations and part locations on the manufacturing platform that meet cylindricity and flatness tolerance requirement specified on the part.
Sundararaman Anand, Ph.D. (Committee Chair)
Sundaram Murali Meenakshi, Ph.D. (Committee Member)
David Thompson, Ph.D. (Committee Member)
65 p.
Mechanics
Additive Manufacturing; Virtual Simulation; Form Errors; Machine Positional Errors

Recommended Citations

Citations

  • Bhatia, S. (2014). Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820498

    APA Style (7th edition)

  • Bhatia, Shaleen. Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing. 2014. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820498.

    MLA Style (8th edition)

  • Bhatia, Shaleen. "Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing." Master's thesis, University of Cincinnati, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820498

    Chicago Manual of Style (17th edition)

ucin1406820498
1,376
© 2014, some rights reserved.Creative Commons License Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing by Shaleen Bhatia is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.