Three-dimensional-printed molds and materials for injection molding and rapid tooling applications

Dizon, John Ryan C.; Valino, Arnaldo D.; Souza, Lucio R.; Espera, Alejandro H.; Chen, Qiyi; Advincula, Rigoberto C.

doi:10.1557/mrc.2019.147

Cited by 61 publications

(61 citation statements)

References 44 publications

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“…The process is completely industrialized and automatized for mass production [ 16 ]. The process can also be scaled down for prototype fabrication [ 17 , 18 ] and even the expensive mold fabrication can be scaled down using additive manufacturing methods [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

2021

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Soft robotics and flexible electronics are rising in popularity and can be used in many applications. However, there is still a need for processing routes that allow the upscaling in production for functional soft robotic parts in an industrial scale. In this study, injection molding of liquid silicone is suggested as a fabrication method for sensorized robotic skin based on sensor fiber composites. Sensor fibers based on thermoplastic elastomers with two different shore hardness (50A and 70A) are combined with different silicone materials. A mathematical model is used to predict the mechanical load transfer from the silicone matrix to the fiber and shows that the matrix of the lowest shore hardness should not be combined with the stiffer fiber. The sensor fiber composites are fixed on a 3D printed robotic finger. The sensorized robotic skin based on the composite with the 50A fiber in combination with pre-straining gives good sensor performance as well as a large elasticity. It is proposed that a miss-match in the mechanical properties between fiber sensor and matrix should be avoided in order to achieve low drift and relaxation. These findings can be used as guidelines for material selection for future sensor integrated soft robotic systems.

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Section: Introductionmentioning

confidence: 99%

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

2021

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“…A most common way that these groups have contributed include activities in producing hundreds and even thousands of PPEs (face shields, masks, and venture valves). [48,95,96] (see Supplementary Material).…”

Section: D Printing Ppes At Organizations and Universitiesmentioning

confidence: 99%

“…Our group recently published a study regarding the possibility of combining AM (3D printing) and formative manufacturing (injection molding). [95,96] The cost and lead time for tooling/ mold fabrication will be significantly reduced when these two processes are combined. Therefore, the 3D-printed tool or die becomes a multiplier.…”

Section: Combination Of Am and Formative Manufacturingmentioning

confidence: 99%

Additive manufacturing for COVID-19: Devices, materials, prospects, and challenges

et al. 2020

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“…Apart from polyamide‐based materials, the use of other polymers is found with very limited success. These polymers include polystyrene, polycarbonate, and polyether ether ketone (PEEK), a type of high‐performance polymer, whereas composites such as polystyrene – nano‐Al 2 O 3 or pure aluminum powder, Nylon‐11 filled with glass beads or silica nanoparticles, or polymers with silicon carbide (SiC), and hydroxyapatite (HA) are developed with success for different SLS applications.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of a Robust Polyamide‐12‐Carbon Black Composite via Selective Laser Sintering: Thermal and Electrical Conductivity

Espera

Valino

Palaganas

et al. 2019

Macro Materials & Eng

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Selective Laser SinteringThe need for big volume powder materials in building mechanically robust sintered parts via selective laser sintering (SLS) has been observed considering the direction towards the future of mass fabrication. This work presents a facile approach of combining polyamide-12 (PA12) and carbon black (CB) powders to be used in the SLS application. The study investigates the mixing consistency, mechanical property, and thermal stability changes of the resulting 3D printed material. Bulk resistivity is correlated with the amount of CB, showing consistency of carbon content in the sintered parts produced by the effective separate grains mixing method. 3D printed parts are built with 0, 1.5, 3, 5 and 10 wt% CB via SLS. Improvements are seen at 1.5 and 3 wt% CB with the blockage of crack growth by the CB particles on applied load. For concentrations greater than 3 wt%, mechanical properties degrade due to hindering of physical contact between PA12 particles caused by CB particles, thereby reducing the effectiveness of the sintering process. The CB/PA12 sintered parts exhibit enhanced thermal stability resulting in higher degradation temperatures than the neat PA12. Therefore, in this study, thermally and mechanically enhanced 3D printed CB/PA12 build parts via SLS are successfully demonstrated.

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Three-dimensional-printed molds and materials for injection molding and rapid tooling applications

Abstract: Abstract

Cited by 61 publications

References 44 publications

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

Sensorized Robotic Skin Based on Piezoresistive Sensor Fiber Composites Produced with Injection Molding of Liquid Silicone

Additive manufacturing for COVID-19: Devices, materials, prospects, and challenges

3D Printing of a Robust Polyamide‐12‐Carbon Black Composite via Selective Laser Sintering: Thermal and Electrical Conductivity

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