Numerical and experimental investigation of effective parameters on separation force in bottom-up stereolithography process

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, Amirkabir University of Technology

2 New Technologies Research Center, Amirkabir University of Technology, Iran

10.22060/ajme.2020.18408.5903

Abstract

Bottom-up or constrained-surface stereolithography is included among the additive manufacturing methods. During this process, a separation force is generated just as a solidified layer separates from the base of resin vat. This force leads to product delamination which in turn stimulates the product failure. A novel and efficient solution to this problem is achieved by studying the interaction force on the specimen contact zone. The approach which is proposed in this study is based on experimental measurements of the force exerted during the process. Different parameters regarding the process and product characteristics are varied in several tests and a comprehensive analysis is conducted to correspond test condition to the resulting separation force. The parameters with significant influence on this force are process speed, cross-section area, the complexity of geometry and orientation of solidification. For some different cases, the highest difference between the simulated and experimental results remains beyond 5%. By examining the effect of these parameters, it is observed that higher velocity, larger cross-section area or more part geometry complexity increase the separation force. Another novelty of this article concerns the study of the producing orientation on the separation force and the investigation indicates the highest values of separation anxiety on the sharp edge of the produced part. Related experimentation is performed to determine the effect of cross-sectional and geometrical complexity on the production parameters.

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