New Development in Computer Aided Electroforming for Rapid Prototyping Applications

2008 ◽  
Author(s):  
Mario Monzo´n ◽  
Pedro M. Herna´ndez ◽  
Mari´a D. Marrero ◽  
Antonio N. Beni´tez ◽  
Fernando Ortega ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
High Speed ◽  
Rotational Moulding ◽  
New Device ◽  
New Development ◽  
Metallic Shell ◽  
Edm Electrodes ◽  
Parts Manufacturing ◽  
Metallic Parts ◽  
High Level

Electroforming enables metallic parts manufacturing with good mechanical properties and high level of accuracy and reproducibility. A thin metallic shell is deposited on a model and later released from it. There are several applications of electroforming combined with rapid prototyping: injection moulds, EDM electrodes, moulds for rotational moulding, complex metallic parts, etc. However the two main disadvantages of electroforming are the non uniform thicknesses distribution and high time of shell manufacturing. The paper focuses on a new development in order to achieve uniform thickness and otherwise a faster shell manufacturing. A new device and software have been developed, named Elecform3D™. The device is an automatic machine controlled by computer and assembled into the electroforming equipment. Otherwise the software not only controls the device but also simulates and calculates the optimal positions of the cathode based in the electrolytic parameters of the bath. The software recommends an automatic program of movements or allows the operator to decide another alternatives programs if necessary. Elecform 3D is an important step beyond electroforming so far. RP 3D printer combined with Elecform 3D is a cheaper alternative for high quality metallic parts manufacturing in comparison with SLS-SLM technologies or high speed machining, mainly for rapid tooling and even rapid manufacturing.

Computer Aided Electroforming for Rapid Manufacturing Applications

2012 ◽  
Author(s):  
Pedro M. Hernández Castellano ◽  
Ayoze Socas Sánchez ◽  
Antonio N. Benítez Vega ◽  
Mario Monzón Verona ◽  
Fernando Ortega García ◽  
...  
Keyword(s):  
Thickness Distribution ◽  
Automatic Device ◽  
Rapid Manufacturing ◽  
High Quality ◽  
Electro Deposition ◽  
Long Time ◽  
Manufacturing Applications ◽  
Parts Manufacturing ◽  
Metallic Parts ◽  
High Level

Electroforming enables the manufacture metallic parts with good mechanical properties and high level of accuracy and reproducibility. A thin metallic shell is deposited on a model and later released from it. There are several applications of electroforming combined with rapid manufacturing (RM) technologies. However the two main disadvantages of electroforming are the non-uniformity thickness distribution and long time span of shell manufacturing. The goal of this research is the evolution of Elecform3D™ product. It is a numerical simulation tool of electroforming process, in order to facilitate design and manufacturing tasks for metallic shells production. This software also controls the automatic device of cathodic orientation (ADCO) inside electrolytic baths. High quality of part is obtained, taking advantage of electroforming properties and improving manufacturing speed. The methodology is based on the well-known potentials model of LaPlace, it enables deposited metal distribution prediction with high grade of precision, being experimentally validated with cathodic polarization curves. Moreover this has also created a subroutine for solving this problem for this application using the boundary element method (BEM). This tool has been tested and validated for the simulation of metal electroplating by using reference solutions of problems in the literature. It also examines changes in the geometry of the cathode as a result of the process of electro-deposition of the metal and the influence of this phenomenon on the simulation routine developed considering variables such as the metal thickness distribution and the rate of deposition. All these tasks work and carry out processes complementing simulation with experimental work in the laboratory in order to create a tool that will give greater potential to this product. The results obtained with the first version of this product were very promising, and also indicated the need for a more precise analysis of electrochemical phenomena in the process of electroforming. Elecform3D™ is an important step beyond electroforming so far, and combined with additive manufacturing (AM) 3D printer, is a cheaper alternative for high quality metallic parts manufacturing in comparison with other RM technologies.

Study on Laser Rapid Prototyping of High Thin-Walled Revolved Parts with Variable Diameters Based on Inside-Laser Coaxial Powder Feeding

2013 ◽  
Vol 419 ◽  
pp. 310-315
Author(s):  
Mei Ling Tian ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Liang Liang Yu
Keyword(s):  
Rapid Prototyping ◽  
High Speed ◽  
Power Regulation ◽  
Thin Walled ◽  
And Performance ◽  
High Level ◽  
Cladding Layers ◽  
Ordinary Steel ◽  
Better Than ◽  
Powder Feeding

The article firstly puts forward an experiment scheme for the study according to the laser rapid prototyping of high-level revolved body accumulate based on inside-laser coaxial powder feeding. And the changes of Z-axis feeding and power regulation in the progress are observed by high speed CCD technology. Then the organization and performance of laser cladding rapid prototyping parts are analyzed. The study shows that the microstructure of the parts is fine and has the characteristics of directional solidification and rapid solidification. The hardness of the parts is better than that of the castings and the ordinary steel parts after heat treatment. The hardness of cladding layers is floated , but there are little differences between each layer.

Rapid prototyping applied to a new development in moulds for rotational moulding

2007 ◽  
Vol 2 (4) ◽  
pp. 209-216 ◽  
Author(s):  
Mario Monzón ◽  
María D. Marrero ◽  
Antonio N. Benítez ◽  
Pedro M. Hernández ◽  
M. Kearns
Keyword(s):  
Rapid Prototyping ◽  
Rotational Moulding ◽  
New Development

scholarly journals 2D-3D integration of hexagonal boron nitride and a high-κ dielectric for ultrafast graphene-based electro-absorption modulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hitesh Agarwal ◽  
Bernat Terrés ◽  
Lorenzo Orsini ◽  
Alberto Montanaro ◽  
Vito Sorianello ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hafnium Oxide ◽  
High Speed ◽  
Hexagonal Boron Nitride ◽  
Temperature Stability ◽  
Cost Effective ◽  
Fold Increase ◽  
Building Blocks ◽  
High Quality ◽  
New Device

AbstractElectro-absorption (EA) waveguide-coupled modulators are essential building blocks for on-chip optical communications. Compared to state-of-the-art silicon (Si) devices, graphene-based EA modulators promise smaller footprints, larger temperature stability, cost-effective integration and high speeds. However, combining high speed and large modulation efficiencies in a single graphene-based device has remained elusive so far. In this work, we overcome this fundamental trade-off by demonstrating the 2D-3D dielectric integration in a high-quality encapsulated graphene device. We integrated hafnium oxide (HfO2) and two-dimensional hexagonal boron nitride (hBN) within the insulating section of a double-layer (DL) graphene EA modulator. This combination of materials allows for a high-quality modulator device with high performances: a ~39 GHz bandwidth (BW) with a three-fold increase in modulation efficiency compared to previously reported high-speed modulators. This 2D-3D dielectric integration paves the way to a plethora of electronic and opto-electronic devices with enhanced performance and stability, while expanding the freedom for new device designs.

Evaluation of Parts Produced by a Novel Additive Manufacturing Process

2013 ◽  
Vol 315 ◽  
pp. 63-67 ◽  
Author(s):  
Muhammad Fahad ◽  
Neil Hopkinson
Keyword(s):  
Additive Manufacturing ◽  
Rapid Prototyping ◽  
Manufacturing Process ◽  
High Speed ◽  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Layer By Layer ◽  
Nylon 12 ◽  
Measuring Machine ◽  
End Use

Rapid prototyping refers to building three dimensional parts in a tool-less, layer by layer manner using the CAD geometry of the part. Additive Manufacturing (AM) is the name given to the application of rapid prototyping technologies to produce functional, end use items. Since AM is relatively new area of manufacturing processes, various processes are being developed and analyzed for their performance (mainly speed and accuracy). This paper deals with the design of a new benchmark part to analyze the flatness of parts produced on High Speed Sintering (HSS) which is a novel Additive Manufacturing process and is currently being developed at Loughborough University. The designed benchmark part comprised of various features such as cubes, holes, cylinders, spheres and cones on a flat base and the build material used for these parts was nylon 12 powder. Flatness and curvature of the base of these parts were measured using a coordinate measuring machine (CMM) and the results are discussed in relation to the operating parameters of the process.The result show changes in the flatness of part with the depth of part in the bed which is attributed to the thermal gradient within the build envelope during build.

Effect of Air Fraction on Force Coefficients in Oscillatory Flow

2021 ◽  
Author(s):  
Malene Hovgaard Vested ◽  
Erik Damgaard Christensen
Keyword(s):  
High Speed ◽  
Offshore Structures ◽  
Air Injection ◽  
Wave Loads ◽  
Morison Equation ◽  
Force Coefficients ◽  
Air Content ◽  
Set Up ◽  
High Level ◽  
Spilling Breakers

Abstract The forces on marine and offshore structures are often affected by spilling breakers. The spilling breaker is characterized by a roller of mixed air and water with a forward speed approximately equal to the wave celerity. This high speed in the top of the wave has the potential to induce high wave loads on upper parts of the structures. This study analyzed the effect of the air content on the forces. The analyses used the Morison equation to examine the effect of the percentage of air on the forces. An experimental set-up was developed to include the injection of air into an otherwise calm water body. The air-injection did introduce a high level a turbulence. It was possible to assess the amount of air content in the water for different amounts of air-injection. In the mixture of air and water the force on an oscillating square cylinder was measured for different levels of air-content, — also in the case without air. The measurements indicated that force coefficients for clear water could be use in the Morison equation as long as the density for water was replaced by the density for the mixture of air and water.

Optimization of high-level preventive maintenance scheduling for high-speed trains

2019 ◽  
Vol 183 ◽  
pp. 261-275 ◽  
Author(s):  
Boliang Lin ◽  
Jianping Wu ◽  
Ruixi Lin ◽  
Jiaxi Wang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Preventive Maintenance ◽  
High Speed ◽  
Maintenance Scheduling ◽  
High Speed Trains ◽  
High Level

Electrodeposited Nanocrystalline Nickel Parts

2012 ◽  
Vol 201-202 ◽  
pp. 1102-1105
Author(s):  
Jin Song Chen ◽  
Jian Ming Yang
Keyword(s):  
Rapid Prototyping ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Nanocrystalline Nickel ◽  
Fine Grained ◽  
Average Grain Size ◽  
Machined Parts ◽  
Jet Electrodeposition ◽  
Fine Grained Structure ◽  
Metallic Parts

The principles of jet electrodeposition orientated by rapid prototyping were introduced , The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition oriented by rapid prototyping. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument . The results show that the successful fabrication of metallic parts demonstrates the potential of the jet electrodeposition process for prototyping technology . The jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure( average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters..The dimensional accuracy as well as the surface quality of metallic parts and tools manufactured using jet electrodeposition techniques still lag far behind those of conventionally machined parts.

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