Analysis of the state of the art of technical drawings of plastic molded parts regarding tolerance specifications and resultant production expenses in the injection molding process
Falke A, Bohn M, Osswald TA (2021)
Publication Type: Conference contribution
Publication year: 2021
Publisher: Society of Plastics Engineers
Book Volume: 2021-May
Conference Proceedings Title: Annual Technical Conference - ANTEC, Conference Proceedings
Event location: Virtual, Online
Abstract
The plastic-specific material properties are often not taken into account in the specification of technical drawings of injection molded parts. As a result, tolerance requirements are specified, that are too tight and sometimes even impossible to manufacture, which result in high production expenses. To avoid this, it is necessary to coordinate the functionally required accuracies of plastic components with the technical possibilities available for injection molding production. In this paper a systematic analysis of drawings from practice is used, to show the current state of the art regarding geometric product specification and tolerance assignment of plastic molded parts. In addition to the quantification of the number of specified features, the unambiguousness of the product specification is assessed. Beyond that, the degree of accuracy of the tolerance requirements is quantified and the manufacturing feasibility is checked in accordance with ISO 20457 in order to then determine the resulting production expense that is necessary to achieve the required tolerances. It is proven that for almost a fifth of the plastic parts tolerance requirements are specified that are not feasible to be produced in the injection molding process. Additionally, it is found that all drawings examined do contain ambiguously specified features, that do not allow for an unambiguous verification.
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Germany (DE)How to cite
APA:
Falke, A., Bohn, M., & Osswald, T.A. (2021). Analysis of the state of the art of technical drawings of plastic molded parts regarding tolerance specifications and resultant production expenses in the injection molding process. In Annual Technical Conference - ANTEC, Conference Proceedings. Virtual, Online: Society of Plastics Engineers.
MLA:
Falke, Anja, Martin Bohn, and Tim A. Osswald. "Analysis of the state of the art of technical drawings of plastic molded parts regarding tolerance specifications and resultant production expenses in the injection molding process." Proceedings of the 2021 SPE Annual Technical Conference, ANTEC 2021, Virtual, Online Society of Plastics Engineers, 2021.
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