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检索条件"任意字段=AHFE International Conference on Additive Manufacturing, Modeling Systems and 3D Prototyping"

共 278 条记录，以下是231-240 订阅

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A LINE HEAT INPUT MOdEL FOR additive manufacturing

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10th ASME international manufacturing Science and Engineering conference (MSEC2015)

作者： Irwin, Jeff Michaleris, P. Penn State Univ Dept Mech & Nucl Engn University Pk PA 16802 USA Pan Comp LLC University Pk PA 16802 USA

ISBN: (纸本)9780791856826

A line input model has been developed which makes the accurate modeling of powder bed processes more computationally efficient. Goldak's ellipsoidal model has been used extensively to model heat sources in additive manufacturing, including lasers and electron beams. To accurately model the motion of the heat source, the simulation time increments must be small enough such that the source moves a distance smaller than its radius over the course of each increment. When the source radius is small and its velocity is large, a strict condition is imposed on the size of time increments regardless of any stability criteria. In powder bed systems, where radii of 0.1 mm and velocities of 500 mm/s are typical, a significant computational burden can result. The line heat input model relieves this burden by averaging the heat source over its path. This model allows the simulation of an entire heat source scan in just one time increment. However, such large time increments can lead to inaccurate results. Instead, the scan is broken up into several linear segments, each of which is applied in one increment. In this work, time increments are found that yield accurate results (less than 10 % displacement error) and require less than 1/10 of the CPU time required by Goldak's moving source model. A dimensionless correlation is given that can be used to determine the necessary time increment size that will greatly decrease the computational time required for any powder bed simulation while maintaining accuracy.

关键词： 3d printers

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Workshop Rapid prototyping - A new approach to introduce digital manufacturing in engineering education

Workshop Rapid Prototyping - A new approach to introduce dig...

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international conference on Information Technology Based Higher Education and Training, ITHET

作者： Stefan Junk Rebecca Matt Department of Business and Engineering University of Applied Sciences Offenburg Germany

This paper presents a new approach for the teaching of competence in additive manufacturing to engineering students in product development. Particularly new to this approach is the combination of the students' autonomous assembly and commissioning of a 3d-printer, and the independent development of guidelines for this new technology regarding the design of components. This way the students will be able to gain first practical experiences with the data preparation, the additive manufacturing process itself and also the required post-treatment of the 3d-printed parts. To allow the students a significantly deeper insight into the functioning of 3d-printing, the workshop Rapid prototyping developed a new approach in the course of which the students first assemble a construction kit for a 3d-printer themselves and then commission the printer. This enables the students to gain a better understanding of the functionality and configuration of additive manufacturing. In a next step, the students used the 3d-printers they constructed themselves to produce components which they take from a database. Finally, the experiences of the students in the course of the workshop will be evaluated to review the effectiveness of the new approach.

关键词： Three-dimensional displays Printers Solid modeling manufacturing conferences design automation databases

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Advances in the development of missile telemetry test sets: Utilizing 3d printing for rapid prototyping and manufacturing

Advances in the development of missile telemetry test sets: ...

引用

作者： Apalboym, Maxim Kujiraoka, Scott NAVAIR Point MuguCA United States

Functionally testing missiles in the All Up Round (AUR), a configuration that consists of a complete system packaged in its flight worthy state, requires the use of test sets along with constituent conformal equipment for interfacing. during developmental testing, telemetry (TM) sections are integrated within an AUR missile. These test sets monitor TM unit performance while maintaining form, fit, and function;therefore, resulting in complete data confidence. Initiating TM functional tests permit a capability in verifying that TM sections have been integrated properly. Safety being a priority, in order to attenuate RF radiation leakage while providing repeatable test capabilities in the near-field, antenna couplers are fabricated as a shielding interface between the user and radiating source and a coupling interface between an AUR missile and the test set. Generally, antenna couplers are composed of metallic bodies which require machine shop fabrication. The process of getting machined parts can take up to several months which can delay delivery schedules. With the availability of 3d printing capabilities and methods in metalizing various materials, a novel approach to fabricating antenna couplers has been explored. The use of modeling Software Packages (Computer Aided design and Electromagnetic Solvers) and additive printing play key roles in reducing the development cycle time while saving costs, decreasing weight, and sustaining performance. This paper will detail the efforts using 3d printing capabilities in the development and fabrication of an antenna coupler with several examples cited herein.

关键词： 3d printers

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Quality Control for Fused deposition modeling Based additive manufacturing: Current Research and Future Trends

Quality Control for Fused Deposition Modeling Based Additive...

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international conference on Reliability systems Engineering

作者： Tingting Huang Shanggang Wang Ketai He School of Reliability and Systems Engineering Beihang University School of Mechanical Engineering University of Science and Technology

ISBN: (纸本)9781467385589

additive manufacturing (AM) is a novel way of manufacturing in the recent decade, and it has complexity free and customization advantages over subtractive manufacturing. Fused deposition modeling (FdM) belongs to AM, and it fabricates products using liquefied thermoplastic material. Products are manufactured layer-by-layer based on 3d computer aided designs (CAd). As a new technology, quality of outgoing products is the key aspect that people focus on. Engineering process control (EPC) and statistical process control (SPC) are two ways to guarantee and improve product quality. EPC has already been used in FdM to give feedback control of the process based on detected variations. However, very infrequent work has been done on SPC in FdM to reduce variation in manufacturing process, so that assignable causes can be detected when they occur. This paper summarizes current research in quality control for FdM, including process and quality parameters, measuring instruments, and current EPC and SPC methods. Future trends in this research area are discussed finally.

关键词： Fused deposition modeling additive manufacturing Quality control Statistical process control Engineering process control Run-to-run statistical process control Quality Control Frequency division multiplexing additive manufacturing Printing, Three-dimensional Process control Quality management run to run rapid prototyping UCN3 gene SUPPRESSION POOL COOLING current research erucylphosphocholine Full mold process

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Rapid prototyping of small wind turbine blades using additive manufacturing

Rapid prototyping of small wind turbine blades using additiv...

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Robotics and Mechatronics conference (RobMech)

作者： Sean Poole Russell Phillips Sean Poole is with Faculty of Mechanical Engineering Nelson Mandela Metropolitan University Port Elizabeth South Africa

For practical research results at NMMU on small wind turbine blade design, a manufacturing method was required to rapid prototype various iterations of blade designs. The requirements of the manufacturing method were a rapid (a few days), cost effective and accurate technique to produce full size small wind turbine blades (up to 1.4 m long) that could withstand short term testing. From the manufactured wind turbine system, results could be obtained and design changes made to the following iteration of the blade design. The process used to manufacture the blades involves five steps: 1) A program to design the turbine blade. 2) A program to develop a CAd model from the designed blade parameters. 3) A CAM programme to process the CAd for 3d printing. 4) 3d printing (additive manufacturing) of the turbine blade geometry using FdM (Fused deposition modeling). 5) Reinforcement of the PLA plastic printed blade. For this research, the 3d printer has been designed and manufactured. The first few iterations of blade designs have been manufactured and the testing of the blades is currently under way. Future testing of the long term structural characteristics of turbine blades produced using this method is recommended and planned. This documented research is drawn from a section of Poole's Phd research (Optimisation of a Mini Horizontal Axis Wind Turbine to Increase Energy Yield during Short duration Wind Variations) [1].

关键词： Blades Three-dimensional displays Wind turbines Solid modeling design automation Printing

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Automation of a laser welding system for additive manufacturing

Automation of a laser welding system for additive manufactur...

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IEEE international conference on Automation Science and Engineering

作者： Petter Hagqvist Anna-Karin Christiansson Almir Heralic Department of Engineering Science University West GKN Aerospace Engine Systems

ISBN: (纸本)9781467381840

This paper presents the benefits and challenges of using a standard robotised laser welding cell for additive manufacturing (AM). additive manufacturing, sometimes denoted 3d-printing or rapid prototyping, has lately met strong interest in several areas of society, and a variety of technologies and materials have been in focus. The current paper summarises automation efforts for AM of advanced aero engine components using high power laser with welding optics as power source for melting metal wire and using an industrial robot for obtaining a 3-dimensional feature shape. The challenges are related to the process itself encountering high and repeated temperatures with melting and solidification of the metal as the main players. The major research solutions discussed in this paper are related to automation issues for obtaining a stable process and to have control of the temperatures and temperature changes that the metals encounter during the process. The solutions are successfully implemented in an industrial laser welding cell.

关键词： Wires Temperature measurement Electrical resistance measurement Welding Surface treatment Geometry Robots

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Injected 3d electrical traces in additive manufactured parts with low melting temperature metals

Injected 3D electrical traces in additive manufactured parts...

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IEEE international conference on Robotics and Automation (ICRA)

作者： John P. Swensen Lael U. Odhner Brandon Araki Aaron M. dollar Yale University New Haven CT RightHand Robotics Cambridge MA Massachusetts Institute of Technology Cambridge MA

ISBN: (纸本)9781479969241

While techniques exist for the rapid prototyping of mechanical and electrical components separately, this paper describes a method where commercial additive manufacturing (AM) techniques can be used to concurrently construct the mechanical structure and electronic circuits in a robotic or mechatronic system. The technique involves printing hollow channels within parts that are then filled with a low melting point liquid metal alloy that solidifies upon cooling to form electrical traces. This method is compatible with most conventional fused deposition modeling and stereolithography machines, and requires no modification to an existing printer, though the technique could easily be incorporated into multi-material machines. Three primary considerations are explored using the a commercial fused deposition manufacturing (FdM) process as a testbed: material and manufacturing process parameters, simplified injection fluid mechanics, and automatic part generation using standard printed circuit board software tools. As demonstration of the ability to embed circuit in RP parts, a differential-drive robot is printed, populated with discrete electronic components, and injected to create a fully functional robot.

关键词： Metals Liquids Robots Printers Three-dimensional displays Frequency division multiplexing

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Patient specific mandibular implant for maxillofacial surgery using additive manufacturing

Patient specific mandibular implant for maxillofacial surger...

引用

international conference on Industrial Engineering and Operations Management (IEOM)

作者： Abdulrahman Al-Ahmari Emad Abouel Nasr Khaja Moiduddin Mohammed Alkindi Ali Kamrani Industrial Engineering Department King Saud University Riyadh Saudi Arabia Mechanical Engineering Department Helwan University Cairo Egypt Maxillofacial Surgery and Diagnostic Sciences Department King Saud University Riyadh Saudi Arabia Industrial Engineering Department University of Houston Houston TX USA

The reconstruction of mandible bone defects by the intraoperative planning of design implant results in the aesthetic and cosmetic deviation leading to increase surgical time and implant revision. The maxillofacial surgery can be improved using advanced manufacturing technique such as additive manufacturing technology with the medical modeling software to design patient specific implant which can custom fit the patient's jaw precisely and accurately. The commercial produced mandible reconstruction implants are of standard size and shape which needs manual bending before surgery, using trial and error method to custom fit the patient's jaw. Even a slight mismatch between the bone-plate interface results in the implant loosening and failure. With the integration of computer aided design (CAd), additive manufacturing, and advanced imaging systems (CT or MRI), the patient CT scan images are analyzed and processed using medical modeling software into a 3d format to produce a customized or patient specific design implant via additive manufacturing technique, such as fused deposition modeling and Electron beam melting technology. The produced customized implant fits accurately onto the patient's jaw, thus reducing the implant revision and surgery time. The customized mandible implant design and its fabrication using additive manufacturing is an effective method in the mandible reconstruction surgery. In this study, a digital design route for patient specific mandible implant is proposed.

关键词： Implants Surgery Fabrication additives Solid modeling Titanium

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Out-of-Plane Geometric Error Prediction for additive manufacturing

Out-of-Plane Geometric Error Prediction for Additive Manufac...

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IEEE international conference on Automation Science and Engineering

作者： Yuan Jin S. Joe Qin Qiang Huang Mork Family Department of Chemical Engineering and Materials Science University of Southern California Daniel J. Epstein Department of Industrial and Systems Engineering University of Southern California

ISBN: (纸本)9781467381840

additive manufacturing (AM) is a promising direct manufacturing technology and geometric accuracy of AM built products is crucial to fulfill the promise of AM. The prediction of the out-of-plane or z direction geometric errors has been a daunting task for AM. Although Finite Element Method simulation has been extensively applied to predict 3d deformation and distortion, improving part accuracy purely based on such simulation still needs significant methodology development. We have been establishing an alternative strategy that can be predictive and transparent to specific products and AM processes. Successful results have been accomplished in our previous work to predict the in-plane (x-y plane) geometric errors. In this study we aim to extend the methodology to the out-of-plane geometric error prediction. We provide a novel spatial deviation formulation in which both in-plane and out-of-plane errors are placed under a consistent mathematical framework. The derived predictive model for out-of-plane errors is validated through experimentation using a stereolithography process.

关键词： 3d geometric error Out-of-plane error Predictive modeling

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NEW APPROACH FOR dESIGN EdUCATION IN dESIGN FOR additive manufacturing 13

NEW APPROACH FOR DESIGN EDUCATION IN DESIGN FOR ADDITIVE MAN...

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13th international design conference

作者： Junk, S. Univ Appl Sci Offenburg Germany Dept Business Adm & Engn Lab Rapid Prototyping RP & Comp Aided Engn CAE Klosterstr 14 D-77723 Gengenbach Germany

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