Manufacturability Analysis of Flatness Tolerances in Solid Freeform Fabrication

Author:

Arni Ramakrishna1,Gupta S. K.1

Affiliation:

1. Mechanical Engineering Department and Institute for Systems Research, University of Maryland, College Park, MD 20742

Abstract

Increasingly, Solid Freeform Fabrication (SFF) processes are being considered for creating functional parts. In such applications, SFF can either be used for creating tooling (i.e., patterns for casting, low volume molds, etc.) or directly creating the functional part itself. In order to create defect free functional parts, it is extremely important to fabricate the parts within allowable dimensional and geometric tolerances. This paper describes a systematic approach to analyzing manufacturability of parts produced using SFF processes with flatness tolerance requirements on the planar faces of the part. Our research is expected to help SFF designers and process providers in the following ways. By evaluating design tolerances against a given process capability, it will help designers in eliminating manufacturing problems and selecting the right SFF process for the given design. It will help process providers in selecting a build direction that can meet all design tolerance requirements.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Reference14 articles.

1. Rajagopalan, S., Pinilla, J. M., Losleben, P., Tian, Q, and Gupta, S. K., 1998, “Integrated Design and Manufacturing Over the Internet,” in Proceedings of the ASME Computers in Engineering Conference, Atlanta, GA, September.

2. Tumer, I., Thompson, D. C., Crawford, R. H., and Wood, K. L., 1995, “Surface Characterization of Polycarbonate Parts from Selective Laser Sintering,” in the Proceedings of the Solid Freeform Fabrication Symposium, Austin, TX. August 7–9.

3. Gervasi, V. R., 1997, “Statistical Process Control for Solid Freeform Fabrication Processes,” in the Proceedings of Solid Freeform Fabrication Symposium, Austin, pp. 141–148, August 11–13.

4. Rosen, David W., Sambu, Shiva Prasad, and West, Aaron P., 2001, “A Process Planning Method for Improving Build Performance in Stereolithography,” accepted for publication in Computer-Aided Des.

5. Onuh, S. O., and Hon, K. K. B., 1997, “Optimizing Build Parameters and Hatch Style for Part Accuracy in Stereolithography, in the Proceedings of Solid Freeform Fabrication Symposium, Austin, pp. 653–660, August 11–13.

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