Indian Journal of Engineering & Materials Sciences

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Fabrication of prototype connecting rod of PLA plastic material using FDM prototype technology


Affiliations
1 Department of Mechanical Engineering, G.L Bajaj Institute of Technology & Management, Greater Noida 201310, India
2 Department of Mechanical Engineering, Delhi Technological University, New Delhi 110 042, India

Rapid prototyping (RP) have been attracting attention in the manufacturing community because of their capability to reduce the lead time of product development. Present work is an effort to understand the influence of process variables like infill pattern, layer thickness, build orientation and infill density on dimensional accuracy (DA), flatness and cylindricity. Taguchi method orthogonal array L9 was used for the conduction of experiments. MakerBot Replicator-2 was used for the fabrication of scaled prototype connecting rod of polylactic acid (PLA) material. DA, flatness and cylindricity of the component were measured by using coordinate measuring machine (CMM). Analysis of variance (ANOVA) was employed to find out the significance of process parameters. A regression model was developed to predict the DA, flatness and cylindricity. The results reveal that the optimum process parameters for the DA, flatness and cylindricity were different. Utility Theory was used to find out the best process parameter condition. The best process parameters for the DA, flatness and cylindricity was found to be layer thickness 100 µm, linear infill pattern, inclined at 45º orientation and 20% infill density. A confirmation test was conducted for checking the goodness of the model, which reveals that results were within the confidence limit.
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  • Fabrication of prototype connecting rod of PLA plastic material using FDM prototype technology

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Authors

Nagendra Kumar Maurya
Department of Mechanical Engineering, G.L Bajaj Institute of Technology & Management, Greater Noida 201310, India
Nagendra Kumar Maurya
Department of Mechanical Engineering, Delhi Technological University, New Delhi 110 042, India
Vikas Rastogi
Department of Mechanical Engineering, Delhi Technological University, New Delhi 110 042, India
Pushpendra Singh
Department of Mechanical Engineering, Delhi Technological University, New Delhi 110 042, India

Abstract


Rapid prototyping (RP) have been attracting attention in the manufacturing community because of their capability to reduce the lead time of product development. Present work is an effort to understand the influence of process variables like infill pattern, layer thickness, build orientation and infill density on dimensional accuracy (DA), flatness and cylindricity. Taguchi method orthogonal array L9 was used for the conduction of experiments. MakerBot Replicator-2 was used for the fabrication of scaled prototype connecting rod of polylactic acid (PLA) material. DA, flatness and cylindricity of the component were measured by using coordinate measuring machine (CMM). Analysis of variance (ANOVA) was employed to find out the significance of process parameters. A regression model was developed to predict the DA, flatness and cylindricity. The results reveal that the optimum process parameters for the DA, flatness and cylindricity were different. Utility Theory was used to find out the best process parameter condition. The best process parameters for the DA, flatness and cylindricity was found to be layer thickness 100 µm, linear infill pattern, inclined at 45º orientation and 20% infill density. A confirmation test was conducted for checking the goodness of the model, which reveals that results were within the confidence limit.