Esnaola et al 2018a - Revision history

Materiales.Compuestos at 16:26, 14 October 2022

2022-10-14T16:26:22Z

Materiales.Compuestos at 16:25, 14 October 2022

2022-10-14T16:25:41Z

Materiales.Compuestos at 16:24, 14 October 2022

2022-10-14T16:24:15Z

Scipediacontent at 07:27, 3 May 2022

2022-05-03T07:27:41Z

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Scipediacontent: Scipediacontent moved page Draft Content 770259301 to Esnaola et al 2018a

2022-03-31T15:50:16Z

Scipediacontent moved page Draft Content 770259301 to Esnaola et al 2018a

Scipediacontent: Created page with "== Abstract == In the present work the feasability of 3D printintg, more specifically the FDM (Fused Deposition Modeling) technology, to manufacture moulds of RTM in the phas..."

2022-03-31T15:50:13Z

Created page with "== Abstract == In the present work the feasability of 3D printintg, more specifically the FDM (Fused Deposition Modeling) technology, to manufacture moulds of RTM in the phas..."

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== Abstract ==

In the present work the feasability of 3D printintg, more specifically the FDM (Fused Deposition Modeling) technology, to manufacture moulds of RTM in the phase of prototyping has been demonstrated. The upper part of the mould for a side-intrusion bar of a front door of a car has been manufactured, since the bottom mould is the original metallic. Printing of the mould took 104 hours and 3.8 kg of plastic were used. For the employed PLA, it has been established that up to 5 mm thick the translucency is sufficient to observe the resin flow pattern during injection. In order to increase the rigidity of the mold, different geometries of vertical reinforcements have been analyzed by means of finite element simulations. Finally, the honeycomb-like structure has been selected. At the stage previous to the injection, when the vacuum is made, the presence of the glass fiber preform reduces the displacements measured at different points on the mould. Additionally, the tightness has been good even without applying any kind of surface treatment. However, when the resin is injected the intrinsic stiffness of the mould has not been sufficient to limit displacements and to make a good piece. This has been solved by using a 30 mm thick methacrylate plate to stiffen the mould, which in turn allows the visualization of the flow through the mould.

== Full document ==
<pdf>Media:Draft_Content_770259301native-articles-148.pdf</pdf>

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 <span style="text-align: center; font-size: 75%;">'''Tabla 1.''' Propiedades cuasi-estáticas del PLA obtenido mediante impresión 3D</span></div>
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 |  style="border: 1pt solid black;vertical-align: top;"|1,19 ± 0,18 GPa
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 Adicionalmente a las propiedades mecánicas, como se pretende que las paredes del molde permitan visualizar el avance del frente de flujo durante la fase de inyección, se ha realizado una caracterización cualitativa de la evolución de la transparencia en función del espesor de la pieza. Como se puede observar en la figura 5 el PLA 3D850 es translúcido, por lo que pierde transparencia a mediad que aumenta el espesor. Se ha seleccionado un espesor de pared de molde de 5 mm como espesor máximo que permite fabricar un molde “transparente”.

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 ==1 Introducción==
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-<span style="text-align: center; font-size: 75%;">'''Tabla 1.''' Propiedades cuasi-estáticas del PLA obtenido mediante impresión 3D.</span></div>
+<span style="text-align: center; font-size: 75%;">'''Tabla 1.''' Propiedades cuasi-estáticas del PLA obtenido mediante impresión 3D</span></div>
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 Adicionalmente a las propiedades mecánicas, como se pretende que las paredes del molde permitan visualizar el avance del frente de flujo durante la fase de inyección, se ha realizado una caracterización cualitativa de la evolución de la transparencia en función del espesor de la pieza. Como se puede observar en la figura 5 el PLA 3D850 es translúcido, por lo que pierde transparencia a mediad que aumenta el espesor. Se ha seleccionado un espesor de pared de molde de 5 mm como espesor máximo que permite fabricar un molde “transparente”.
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