Temperature evolution during stereolithography building with a commercial epoxy resin

Corcione, Carola Esposito; Greco, Antonio; Maffezzoli, Alfonso

doi:10.1002/pen.20488

Cited by 35 publications

(18 citation statements)

References 13 publications

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“…Alumina drill bits (left) light energy released for one single exposure and the evoked heat of reaction in a mathematical model. Corcione et al [228] proved that the temperature rise within the photosensitized liquid is proportional to the applied energy dose during an exposure, the distance from the center of the light beam, as well as the inverse of the scanning speed.…”

Section: General Principlementioning

confidence: 99%

Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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This paper offers a review of present achievements in the field of processing of ceramic-based materials with complex geometry using the main additive manufacturing (AM) technologies. In AM, the geometrical design of a desired ceramic-based component is combined with the materials design. In this way, the fabrication times and the product costs of ceramic-based parts with required properties can be substantially reduced. However, dimensional accuracy and surface finish still remain crucial features in today's AM due to the layer-by-layer formation of the parts. In spite of the fact that significant progress has been made in the development of feedstock materials, the most difficult limitations for AM technologies are the restrictions set by material selection for each AM method and aspects considering the inner architectural design of the manufactured parts. Hence, any future progress in the field of AM should be based on the improvement of the existing technologies or, alternatively, the development of new approaches with an emphasis on parts allowing the near-net formation of ceramic structures, while optimizing the design of new materials and of the part architecture.

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Section: General Principlementioning

confidence: 99%

Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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“…Likewise, temperature profile has an important role on quality. Corcione et al (2006) found that temperature increase on vat surface is dependent on energy dose during SL process. Lower scan speed leads to higher temperatures and reaction rates, which involve shrinkage and curl distortion (Corcione et al, 2006).…”

Section: Overview Of Quality Control In Additive Manufacturingmentioning

confidence: 97%

“…Corcione et al (2006) found that temperature increase on vat surface is dependent on energy dose during SL process. Lower scan speed leads to higher temperatures and reaction rates, which involve shrinkage and curl distortion (Corcione et al, 2006). Lee et al (2007) studied the effects of laser energy with respect to thickness of building part and laser speed.…”

Section: Overview Of Quality Control In Additive Manufacturingmentioning

confidence: 97%

A review on quality control in additive manufacturing

Kim

Lin

Tseng

2018

RPJ

228

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Purpose -The usage of additive manufacturing (AM) technology in industries has reached up to 50 per cent as prototype or end-product. However, for AM products to be directly used as final products, AM product should be produced through advanced quality control process, which has a capability to be able to prove and reach their desire repeatability, reproducibility, reliability and preciseness. Therefore, there is a need to review quality-related research in terms of AM technology and guide AM industry in the future direction of AM development. Design/methodology/approach -This paper overviews research progress regarding the QC in AM technology. The focus of the study is on manufacturing quality issues and needs that are to be developed and optimized, and further suggests ideas and directions toward the quality improvement for future AM technology. This paper is organized as follows. Section 2 starts by conducting a comprehensive review of the literature studies on progress of quality control, issues and challenges regarding quality improvement in seven different AM techniques. Next, Section 3 provides classification of the research findings, and lastly, Section 4 discusses the challenges and future trends. Findings -This paper presents a review on quality control in seven different techniques in AM technology and provides detailed discussions in each quality process stage. Most of the AM techniques have a trend using in-situ sensors and cameras to acquire process data for real-time monitoring and quality analysis. Procedures such as extrusion-based processes (EBP) have further advanced in data analytics and predictive algorithms-based research regarding mechanical properties and optimal printing parameters. Moreover, compared to others, the material jetting progresses technique has advanced in a system integrated with closed-feedback loop, machine vision and image processing to minimize quality issues during printing process.Research limitations/implications -This paper is limited to reviewing of only seven techniques of AM technology, which includes photopolymer vat processes, material jetting processes, binder jetting processes, extrusion-based processes, powder bed fusion processes, directed energy deposition processes and sheet lamination processes. This paper would impact on the improvement of quality control in AM industries such as industrial, automotive, medical, aerospace and military production. Originality/value -Additive manufacturing technology, in terms of quality control has yet to be reviewed.

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“…The spatially inhomogeneous initiation rates result in a gradient in double bond conversion along the beam direction. Photopolymerization kinetics of dimethacrylate copolymers under isothermal conditions has been widely studied [8][9][10][11]; however, the study of the photopolymerization reactions under nonisothermal conditions has not received the same attention despite its significance in real-life applications. The polymerization reaction is highly exothermic, which results in an increase in the sample temperature during the process and this effect becomes more important as the sample thickness increases.…”

Section: Introductionmentioning

confidence: 99%

Impact of radiation attenuation and temperature evolution on monomer conversion of dimethacrylate‐based resins with a photobleaching photoinitiator

Mucci

Cook

Vallo

2009

Polymer Engineering & Sci

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The photopolymerization process of a dimethacrylate copolymer system activated by the camphorquinone (CQ)/amine photoinitiator system (1 wt%), was experimentally studied under nonisothermal conditions in 1and 2-mm thick samples by measuring double bond conversion, temperature rise and radiation attenuation through the sample during polymerization. The peak temperature in 1-or 2-mm thick samples irradiated at 5 mW/cm 2 was 29 and 388C, respectively. The temperature evolution during polymerization was also predicted by solving the energy balance coupled with the kinetic expressions for the reaction rate. Radiation attenuation as a function of depth by the photobleachable CQ results in spatial and temporal variation in the local rates of the kinetic steps involved. General relationships for spatiotemporal variations in concentration of a photobleaching initiator, in systems where attenuation and initiator consumption are taken into account, were used to compute local polymerization rates. The effects of radiation attenuation, photobleaching of the photoinitiator and variation of cure temperature at different depths into the resin, all compete to determine the double bond consumption. The increased radiation attenuation in the 2-mm thick sample was accompanied by a higher cure temperature compared with the 1-mm thick sample, and as a result, the monomer conversion averaged over the sample thickness in the 1-and 2-mm thick samples was the same. Results obtained in this research highlight the inherent interlinking of thermal and radiation attenuation effects in bulk photopolymerizing systems.

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Temperature evolution during stereolithography building with a commercial epoxy resin

Cited by 35 publications

References 13 publications

Additive Manufacturing of Ceramic‐Based Materials

Additive Manufacturing of Ceramic‐Based Materials

A review on quality control in additive manufacturing

Impact of radiation attenuation and temperature evolution on monomer conversion of dimethacrylate‐based resins with a photobleaching photoinitiator

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