Additive Manufactoring - Contributi utente [it]

Main Page

2020-01-09T17:45:27Z

FilippoGherardi: /* Processes */

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]
*[[Droplet-Based Manufacturing]]
*[[Laser Processing]]
*[[Augmented reality 3D for manual assemply workstation]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]

=[[Trasversal issues ]]=
*[[3D printing benefits on supply chain]]

Main Page

2020-01-09T17:45:10Z

FilippoGherardi:

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]
*[[Droplet-Based Manufacturing]]
*[[Laser Processing]]
*[[3D printing benefits on supply chain]]
*[[Augmented reality 3D for manual assemply workstation]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]

=[[Trasversal issues ]]=
*[[3D printing benefits on supply chain]]

Augmented reality 3D for manual assemply workstation

2020-01-08T18:37:00Z

FilippoGherardi: Creata pagina con "'''Authors :''' Michela dalle Mura, Gino Dini , Franco Failli '''Keywords:''' integrated environment , assembly , Augmented Reality, error-in-process, sensor '''Purpose:''..."

'''Authors :''' Michela dalle Mura, Gino Dini , Franco Failli

'''Keywords:''' integrated environment , assembly , Augmented Reality, error-in-process, sensor

'''Purpose:''' The document describes an innovative manual assembly workstation able to assist an operator in assembly operations previously planned by a system that combines a torque / force sensor and AR environment.

'''Methodology:''' Workbench, including assembly area, parts containers to be assembled and tools. Applied force sensor centrally located under the work bench. Overhead frame, which supports the camera and the lighting system. PC monitor, used for information exchange with the worker. The AR software was developed with the aim of visually supporting the worker at all stages of the assembly process.

'''Value:''' The assembly sequences have been divided into 10 operations. For each operation, all the various probable events have been considered, subdivided into correct actions or into errors, each of which corresponds to particular ranges of movements and applications of force and torque on the part of the worker, different from each other, which in most operations do not overlap in mathematical terms and therefore each can be detected without ambiguity

'''Limitation:''' In theory, there are no limits to applicability for the proposed system. It could be used both for simple procedures and for complex and lengthy procedures. On the other hand the main problem is represented by the expensive procedure in terms of time required for the installation of the system.

'''Practical implication:''' The described system was tested using an experimental assembly set consisting of 4 elements.

'''Link:''' https://reader.elsevier.com/reader/sd/pii/S221282711501207X?token=D86F8C3902904EE53B1BAEEDCCAC726C7E796499F3E6CD77D0D1AD3CB45E829D0680E2E9C9ECEEB0D822250E83E853BC

3D printing benefits on supply chain

2020-01-08T18:33:18Z

FilippoGherardi: Creata pagina con "'''Authors :''' Andrea Bacchetti, Massimo Zanardini '''Keywords:''' supply chain, 3D printing , logistics, components, reducing '''Purpose:''' Possibility of eliminating st..."

'''Authors :''' Andrea Bacchetti, Massimo Zanardini

'''Keywords:''' supply chain, 3D printing , logistics, components, reducing

'''Purpose:''' Possibility of eliminating stocks and compensating for the impossibility of forecasting demand for low-moving products. Thanks to the convenience of making small batches, 3D printing for the production of on demand components could be an interesting opportunity for many companies which have low-range products in their range .

'''Methodology:''' In the centralized scenario, companies will equip themselves with a certain number of 3D printing machines and, with a request for spare parts directly from the customer, through an online portal dedicated to after-sales service, the company will use a portion of the own machine park for the printing of the desired piece.In the decentralized scenario, the production process is released from the producer and moves towards the suppliers

'''Value:''' In centralized scenario, within a few hours, the product will be ready to be delivered to the customer, without having added grease to the supply chain.In the decentralized scenario the processing time of the customer's order would compress considerably.

'''Conclusion :''' Whatever it will be the future scenario, the logistics chains will be forced to change their current configuration, albeit with different intensities. The lesser impact would be in the centralized scenario, in which the storage of low-moving products and spare parts would be less, compared to an on demand (flexible) production enabled by additive technologies at the manufacturer.

'''Link:''' https://arpi.unipi.it/retrieve/handle/11568/192118/17836/LineFormation3DP-Prime01.pdf

Laser Processing

2020-01-08T18:26:42Z

FilippoGherardi: Creata pagina con "'''Authors :''' Michela dalle Mura, Gino Dini , Michele Lanzetta , Andrea Rossi '''Keywords:''' dental implants , CO2 laser , biocompatible materials, preliminary analysis..."

'''Authors :''' Michela dalle Mura, Gino Dini , Michele Lanzetta , Andrea Rossi

'''Keywords:''' dental implants , CO2 laser , biocompatible materials, preliminary analysis

'''Purpose:''' The objective of the experiment is to study the effects of CO2 laser beams on biocompatible materials and the creation of a mathematical model to relate the process parameters to the groove geometry and surface finish.

'''Methodology:''' In this article the experiments were applied in particular to material samples such as Zirconia and PMMA types for which the mechanical and physical characteristics and the relative ranges of the preliminary parameters used for the analysis related to the quantities useful for "dimensioning" have been reported the power, speed and focal length of the laser.

'''Value:''' The profile for each work performed was observed by an optical sensor and from which it can be seen how the machining of the grooves carried out on PMMA materials approximates the Gaussian which represents the reference model with mean 0 and sigma variance much better in form and geometry.

'''Limitation and conclusions :''' Although the work that was carried out represented a preliminary and exploratory analysis with the aim of studying the effects of the subtractive laser technique on different types of materials, the final results showed that the techniques we used can be successfully implemented on the materials to which we have referred.

'''Practical implication:''' The tests that have been performed can be classified into two phases: SINGLE STEPS : execution of single passages to obtain individual grooves on different materials 75 grooves were made for each material with the same parameters. MULTIPLE STEPS: execution of more steps for creating multiple parallel grooves.

'''Link:''' https://arpi.unipi.it/retrieve/handle/11568/192118/17836/LineFormation3DP-Prime01.pdf

Main Page

2020-01-08T18:21:24Z

FilippoGherardi: /* Processes */

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]
*[[Droplet-Based Manufacturing]]
*[[Laser Processing]]
*[[3D printing benefits on supply chain]]
*[[Augmented reality 3D for manual assemply workstation]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Development of a multifunctional panel for aerospace use through SLM additive manufacturing]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]

Main Page

2020-01-08T18:19:19Z

FilippoGherardi: /* Processes */

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]
*[[Droplet-Based Manufacturing]]
*[[Laser Processing]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Development of a multifunctional panel for aerospace use through SLM additive manufacturing]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]

The Line Formation with Alumina Powders in Drop on Demand Three Dimensional Printing

2020-01-08T18:17:19Z

FilippoGherardi: Creata pagina con "'''Authors :''' M. Lanzetta , E. Sachs'' '''Keywords:''' Droplet-Based Manufacturing, 3DP, inkjet technology, mathematical model, Rapid prototyping '''Purpose:''' Three-di..."

'''Authors :''' M. Lanzetta , E. Sachs''

'''Keywords:''' Droplet-Based Manufacturing, 3DP, inkjet technology, mathematical model, Rapid prototyping

'''Purpose:''' Three-dimensional printing is a production process based on droplets, in which the powdered material is deposited in layers which are selectively joined with a binder from an ink jet printhead. With this technology, functional parts can be created directly from a CAD file. Instead Drop on Demand is an emerging inkjet technology and this article describes the main physical phenomena involved in it.

'''Methodology:''' The process can be divided into the following phases: drop penetration into the powder bed and engulfing of grains, rearrangement and contraction of the binder-powder mixture, engulfing of grains from the line bottom.
Capillary penetration, rearrangement and contraction develop with a spherical and cylindrical symmetry, respectively with primitive balls and lines.

'''Value:''' The maximum theoretical release distance to print a line is given by the size of the primitive ball. In the experiments, however, it has been observed that there is a maximum distance between the drops, correlated to the minimum quantity of binder to trigger the phenomenon, which is about 25-30 µm for the different mixtures of dust tested.

'''Limitation:''' The limit of this technique may be due to the mobility of the powder and therefore two following techniques may have been tested to increase it: powder coating and heating the powder bed. The two methods cannot be used simultaneously because most of the coatings, irreversibly lose their properties at high temperatures.

'''Practical implication:''' An experimental deductive theory of the formation of the 3DP DoD line of alumina powders has been proposed. It can be applied directly in production to improve the quality of the line.

'''Link:''' https://arpi.unipi.it/retrieve/handle/11568/192118/17836/LineFormation3DP-Prime01.pdf

Droplet-Based Manufacturing

2020-01-08T18:08:23Z

FilippoGherardi: Creata pagina con "*The Line Formation with Alumina Powders in Drop on Demand Three Dimensional Printing"

*[[The Line Formation with Alumina Powders in Drop on Demand Three Dimensional Printing]]

Main Page

2020-01-08T18:06:46Z

FilippoGherardi: /* Processes */

[https://docs.google.com/document/d/1Dpv8YCcSNuxh99Nw9ARPFtaRnw1ZEKm8RlWba0UMcWU/edit Istruzioni (in Italian, sorry)]

=[[Materials]]=

[[Additive Manufacturing Approaches for Hydroxyapatite‐Reinforced Composites]]

[[Precision additive manufacturing of NiTi parts using micro direct metal deposition]]

=[[Processes]]=
*[[Fused Deposition Modeling]]
*[[Wire Arc Additive Manifacturing]]
*[[Material Jetting]]
*[[Vat Polymerization]]
*[[Selective Laser Melting]]
*[[Hybrid Additive Manufacturing]]
*[[Laser engineered net shaping]]
*[[Droplet-Based Manufacturing]]

=[[Parts]]=
*[[Selective Laser Melting Parts]]
*[[Development of a multifunctional panel for aerospace use through SLM additive manufacturing]]
*[[3D printing for health & wealth: Fabrication of custom-made medical devices through additive manufacturing.]]