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检索条件"任意字段=Proceedings of the 29th International ACM Conference on 3D Web Technology"

共 459 条记录，以下是121-130 订阅

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Viscosity control of pseudoplastic polymer mixtures for applications in additive-manufacturing 29

Viscosity control of pseudoplastic polymer mixtures for appl...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Vaish, Apoorv Lee, Shien Yang Y Alvarado, Pablo Valdivia Engineering Product Development Singapore University of Technology and Design Singapore Digital Manufacturing and Design Centre Singapore University of Technology and Design Singapore

Various additive manufacturing (AM) processes exploit the rheological properties of non-Newtonian (e.g. pseudoplastic) polymers for stability and feature realization. For embedded 3d-printing (e3dP) and direct ink writing (dIW), features are deposited on top or within a layer of matrix/base material and the rheological properties of the matrix are crucial for satisfactory prints. due to their high apparent viscosities under static conditions, these base polymers do not flow easily when poured in bulk into the fabrication space. Traditionally, manual methods were employed to spread them into an even layer. In this study, an alternative approach to spread and level pseudoplastic polymers using oscillatory shear stresses generated by a vibrating actuator is presented. the proposed approach lowers the viscosity of the polymers, thereby facilitating gravity-driven flow to generate a flat polymer-air interface. A fluid rheology model detailing the parameters influencing the process is presented and experiments are performed using these parameters. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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Production environment of toMorrow (ProMo): Partially automated repair process of small tool moulds, forming tools, injection moulding tools and sand casting tools 13

Production environment of toMorrow (ProMo): Partially automa...

引用

13th international dAAAM Baltic conference and 29th international Baltic conference, BALTMATTRIB 2021

作者： Kuschan, Jan Müller, Vinzenz Mönchinger, Stephan Heimann, Oliver Niebuhr, Carsten Kabha, Oday Fraunhofer Institute for Production Systems and Design Technology IPK Germany

Small defects in the grain or major damage to a moulded part or tool can bring production to a standstill. SMEs in particular have neither the personnel nor the equipment to repair such damage on their own, so they send it to specialised contractors. the repair process is carried out manually, depending on the accuracy requirements, and is usually completed by a finishing process. this work requires qualified personnel and, at the same time, requires a lot of time in case of larger damages. In this paper we present a way to map the Maintenance, Repair and Operations (MRO) process chain in a partially automated manner. the symbiosis of individual technologies results in a significantly increased efficiency of the MRO process chain, which continues to focus on people and their process knowledge. While directed Energy deposition (dEd) for the MRO of moulded parts is used widely, usually a high manual effort in measuring the component geometries and teaching of the machine tool paths is necessary. However, there are clear advantages compared to the manufacture of new parts or manual laser welding repair. At the same time, the resource and energy requirements can often be significantly reduced compared to new part production. ProMo focuses on automating the time-consuming machine programming by reducing the number of necessary work steps in CAd/CAM-based program creation. Based on a subsequent robot-guided scan, a digital actual 3d model is generated. due to intelligent path planning algorithms, no manual programming of the robot is necessary and at the same time it is possible to detect components of different sizes, shapes and covers in this system with a minimum of effort. In addition, the operator passes on elementary information, such as the approach path of the milling head, to the subsequent processes by means of finger gestures and can thus significantly reduce tedious CAM programming steps. Now, the scanned component is transferred to a 3d-CAd model and a target

关键词： Computer aided design

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Morphable components topology optimization for additive manufacturing 29

Morphable components topology optimization for additive manu...

引用

29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Xian, Y. Rosen, d.W. George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States

this paper addresses two issues: 1. Topology optimization (TO) yields designs that may require support structures if additively manufactured, which increase material and clean-up costs. 2. Material anisotropy is induced during additive manufacturing, which results in inaccurate TO results if such material properties are not included in the algorithm. this paper, based on a moving morphable components (MMC) approach where structure is composed of several building blocks, introduces constraints for minimum build angle, as well as a penalty constraint for building blocks with no support material below, so that the TO output is completely printable. Additionally, orthotropic material properties are integrated in the optimization. In a separate optimization algorithm, each building block is assumed to have its own fiber orientation. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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Rod Ejection Accident Simulation of a Small Pressurized Water Reactor 29

Rod Ejection Accident Simulation of a Small Pressurized Wate...

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2022 29th international conference on Nuclear Engineering, ICONE 2022

作者： Fan, Ziqi Sun, Peiwei Wei, Xinyu School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9780791886502

Rod Ejection Accident (REA) is one of the major accidents which may result in the serious consequences during nuclear reactor operation. the study on REA is helpful to understand the physical characteristics and to verify the safety design of the core. the small pressurized water reactor (SPWR) adopts a relatively small amount of control rods. therefore, when REA occurs, the positive reactivity introduced by the accident may be larger, resulting in more serious consequences. the integral design of SPWR results in different responses to the REA. thus, it is necessary to investigate the REA of SPWR. In this paper, 3KeyMaster simulation platform, which is coupled with a thermo-hydraulic model and a three-dimensional space-time neutron dynamics model, is used to establish the reactor core model. Four single-beam control rods are selected to carry out REA, respectively. Simulations are performed, and results are collected. the responses of the SPWR are analyzed and accident procedures are obtained. through analysis, it can be concluded that the serious consequences are caused when the R rod closest to the core, resulting in the maximum nuclear power peak. But the fuel center temperature and cladding temperature do not exceed the limit value, which proves the safety of SPWR and the rationality of core design. © 2022 by ASME.

关键词： Pressurized water reactors

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the impact of digitalization and additive manufacturing on business models and value chains: A scoping review 29

The impact of digitalization and additive manufacturing on b...

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29th international conference of the international Association for Management of technology: Towards the digital World and Industry X.0, IAMOT 2020

作者： van Heerden, A. Grobbelaar, S.S. Sacks, N. South Africa Stellenbosch University South Africa

ISBN: (纸本)9781775921950

this study presents the results of a scoping review regarding literature on the impact of digitalization and additive manufacturing (AM) on value chains and business models (BM). the digital transformation is causing a new industrial paradigm that results in an increase in product diversity due to changing customer requirements. Additive manufacturing, together with digitalization, enables various new ways of creating value for customers, but a key challenge remains the ability to capture value. therefore, new and adapted business model frameworks which focus on the value creation network are required to enable companies to conceptualize how they will capture value to remain competitive. the aim of this scoping review is to explore current literature on business model frameworks from a network perspective, to identify relevant themes and to identify some core studies in order to set the conceptual boundaries for future work which can be applied to the South African cemented tungsten carbide manufacturing industry. © 2020 Towards the digital World and Industry X.0 - proceedings of the 29th international conference of the international Association for Management of technology, IAMOT 2020. All rights reserved.

关键词： 3d printers

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Z-pinning approach for reducing mechanical anisotropy of 3d printed parts 29

Z-pinning approach for reducing mechanical anisotropy of 3D ...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： duty, Chad Failla, Jordan Kim, Seokpum Smith, Tyler Lindahl, John Roschli, Alex Post, Brian Love, Lonnie Kunc, Vlastimil University of Tennessee United States Manufacturing Demonstration Facility Oak Ridge National Laboratory United States Purdue University United States

the mechanical strength of extrusion-based printed parts is often greatly reduced (25-50%) in the build direction (z-direction) compared to the in-plane strength due to poor bonding between successively deposited layers. this effect can be magnified (75-90% difference) when depositing fiber-reinforced materials or larger print areas with long layer times. therefore, a patent-pending approach has been developed that deposits material into intentionally aligned voids in the z-direction, allowing continuous material to span multiple layers. the "z-pinning" approach can be applied to several concepts for improving the interlaminar strength of extrusion-based 3d printed parts as well as techniques for applying the technology across a broad spectrum of deposition platforms and material systems. Initial experimental results demonstrate a significant improvement (>3x) in mechanical strength and (>8x) toughness for fiber reinforced components. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： Extrusion

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IN-SITU SYNthESIS Ni-Ti ALLOY BY LASER CLAddING 29

IN-SITU SYNTHESIS Ni-Ti ALLOY BY LASER CLADDING

引用

29th international conference on Metallurgy and Materials (METAL)

作者： Igoshin, Sergei Masaylo, dmitriy Kim, Artem Popovich, Anatoliy Peter Great St Petersburg Polytech Univ St Petersburg Russia

ISBN: (纸本)9788087294970

the NiTi alloy shape memory effect can have a much larger field of application in industry and everyday life than it is now. the high cost of obtaining this material and the laboriousness of the process limit its scope of application. the use of modern 3d technology may help solve this problem this paper explores the possibility of growing samples of simple geometric shapes in the form of tubes from Ni and Ti elemental powders. Samples from 3 types of powder mixtures have been produced. the first mixture with an excess of Ni relative to the equatorial ratio, the second with a deficit of Ni, the third with 5 % addition of Cu. the microstructure of samples before and after thermal treatment in argon at 900 degrees C was studied. the heat treatment contributed the process of homogenization of the solid solution, but had no significant effect on the sample hardness or reduction of secondary phases. Heat treatment changed hardness by an average of 10%. Phase analysis before and after the heat treatment showed a significant proportion of NiTi phase as well as secondary phases of NiTi2, Ni3Ti, TiO2.

关键词： Additive technology laser cladding powder metallurgy automated production nitinol

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Hybrid manufacturing with FdM technology for enabling power electronics component fabrication 29

Hybrid manufacturing with FDM technology for enabling power ...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Coronel, Jose L. Masum Billah, Kazi Md Acosta Carrasco, Carlos F. Barraza, Sol A. Wicker, Ryan B. Espalin, david Department of Mechanical Engineering University of Texas at El Paso El PasoTX79968 United States W.M. Keck Center for 3D Innovation El PasoTX79968 United States

the introduction of Kapton coated wires within a printed substrate presents the opportunity to design and fabricate power electronics components. Preventing dielectric breakdown of the printed substrate, the ultrasonic embedding approach enables complex geometrical embedding through customized software. this work presents the effective embedding of large diameter (14 AWG) kapton coated litz wire into polycarbonate (PC) substrate. Custom software allowed for generation of embedding toolpaths directly from the CAd model of the designed coupon. Results showed the most successful embedding paths were circular pre-formed cavities. through characterization of a myriad of printed samples, an approach was developed for embedding large diameter wire. through the use of the Foundry Multi3d System, the increased complexity of embedded electronic parts can further impulse the implementation of hybrid additive manufacturing in large scale applications. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： Embeddings

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Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

Solid Freeform Fabrication 2018: Proceedings of the 29th Ann...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

the proceedings contain 200 papers. the topics discussed include: using additive manufacturing as a pathway to change the qualification paradigm;technology integration into existing companies;lattice design optimization: crowdsourcing ideas in the classroom;education of additive manufacturing- an attempt to inspire research;printing orientation and how implicit it is;method for a software-based design check of additively manufactured components;the recycling of E-waste ABS plastics by melt extrusion and 3d printing using solar powered devices as a transformative tool for humanitarian aid;evaluating the surface finish of A356-T6 cast parts from additively manufactured sand molds;nanoparticle bed deposition by slot die coating for microscale selective laser sintering applications;and nanoparticle bed deposition by slot die coating for microscale selective laser sintering applications.

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Investigation into the crystalline structure and sub-Tpm exotherm of selective laser sintered Polyamide 6 29

Investigation into the crystalline structure and sub-Tpm exo...

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29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018

作者： Chen, Peng Wen, Shifeng Yan, Chunze Liu, Jie Shi, Yusheng State key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

Selective Laser Sintering (SLS) has achieved a wide acceptance for direct manufacture of complex functional components. However, the performance of SLS part still needs to be improved, in which the crystalline structure plays an important role. Every crystalline form has specific properties, and the whole material behaviors have great relationships with the various species and crystalline structure. therefore, this paper investigates crystalline structure of laser sintered Polyamide 6 (PA6) and quantifies the different HT-a and LT-a phases using thermal analysis. the results show that the sintered parts are uniformly characterized by a relatively stronger (2 0 0) and a weaker (0 0 2) diffraction peak. this crystalline structure variation is basically consistent for all SLS parts and independent of laser power. In addition, the sub-Tpm crystallization transition concerning a phase was found for SLS PA6 part, which is derived from the release of strain energy absorbed during SLS processing. © Solid Freeform Fabrication 2018: proceedings of the 29th Annual international Solid Freeform Fabrication Symposium - An Additive Manufacturing conference, SFF 2018. All Rights Reserved.

关键词： 3d printers

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