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Aluminium alloys are widely used in manufacturing of parts by subtraction of a high percentage of the initial volume. CAD-CAM offers dynamic roughing strategies as trochoidal toolpath, based in the principle of low values of the cutting forces and heat dissipation due to inherent intermittent cut. In this work, the deep slot milling process of EN AW 2024-T3 aluminium alloy by a stretched trochoidal toolpath, using a tool with variable helix angle and chip splitter, has been evaluated through a factorial design of experiments with the aim of stablish the optimisation rules for this solution. The material removal rate (MRR), surface roughness (Ra) and electric energy consumption (EEC) were analysed within the recommended range of the machining conditions. The results revealed the cutting speed (vc) and feed/tooth (fz) as the most influential factors in MRR, while the surface quality was mainly affected by the radial depth of cut (ae) and feed/tooth (fz). The electric energy consumption depends mainly on vc and fz. Linear regression models were generated from the results which have been shown good reliability to predict and optimize MRR, EEC and Rawall and Rabottom. Three additional experiments validated the models showing minimum errors lower than 5 % for MRR and Rawall and around 10 % for EEC and Rabottom between experimental and predicted results.
O. Rodriguez-Alabanda; G. Guerrero-Vaca; E. Molero; P.E. Romero. Experimental analysis of deep slot milling in EN AW 2024-T3 alloy by stretched trochoidal toolpath and variable helix angle tool. CIRP Journal of Manufacturing Science and Technology 2021, 35, 346 -360.
AMA StyleO. Rodriguez-Alabanda, G. Guerrero-Vaca, E. Molero, P.E. Romero. Experimental analysis of deep slot milling in EN AW 2024-T3 alloy by stretched trochoidal toolpath and variable helix angle tool. CIRP Journal of Manufacturing Science and Technology. 2021; 35 ():346-360.
Chicago/Turabian StyleO. Rodriguez-Alabanda; G. Guerrero-Vaca; E. Molero; P.E. Romero. 2021. "Experimental analysis of deep slot milling in EN AW 2024-T3 alloy by stretched trochoidal toolpath and variable helix angle tool." CIRP Journal of Manufacturing Science and Technology 35, no. : 346-360.
Machine learning algorithms for classification are employed in this study to generate different models that can predict the surface roughness of parts manufactured from polyvinyl butyral by means of Fused Deposition Modeling (FDM). Five input variables are defined (layer height, print speed, number of perimeters, wall angle, and extruder temperature), and 16 parts are 3D printed, each with three different surfaces (48 surfaces in total). The print values used to print each part were defined by a fractionated orthogonal experimental design. Using a perthometer, the average value of surface roughness, Ra, on each surface was obtained. From these experimental values, 40 models were trained and validated. The model with the best prediction results was the one generated by bagging and Multilayer Perceptron (BMLP), with a Kappa statistic of 0.9143. The input variables with the highest influence on the surface finish are the wall angle and the layer height.
Azahara Cerro; Pablo E. Romero; Okan Yiğit; Andres Bustillo. Use of machine learning algorithms for surface roughness prediction of printed parts in polyvinyl butyral via fused deposition modeling. The International Journal of Advanced Manufacturing Technology 2021, 115, 2465 -2475.
AMA StyleAzahara Cerro, Pablo E. Romero, Okan Yiğit, Andres Bustillo. Use of machine learning algorithms for surface roughness prediction of printed parts in polyvinyl butyral via fused deposition modeling. The International Journal of Advanced Manufacturing Technology. 2021; 115 (7-8):2465-2475.
Chicago/Turabian StyleAzahara Cerro; Pablo E. Romero; Okan Yiğit; Andres Bustillo. 2021. "Use of machine learning algorithms for surface roughness prediction of printed parts in polyvinyl butyral via fused deposition modeling." The International Journal of Advanced Manufacturing Technology 115, no. 7-8: 2465-2475.
In the present work, the influence of different printing parameters (number of perimeters, flow, extrusion temperature, layer height and printing speed) on the watertightness of 3D printed parts has been studied. The vessels have been printed on polyethylene terephthalate glycol (PETG) by fused filament deposition modeling (FDM). A total of 27 prismatic vessels have been manufactured, following a fractioned experimental design. By means of a simple test, the quantity of water that has leaked from each vessel after seven hours has been measured. After analyzing the results obtained, using Taguchi method and analysis of variance (ANOVA), it can be stated that the number of perimeters and the flow are the most influential parameters in the watertightness of the vessels. One of the vessels tested had zero leakage. With the printing parameters of this vessel, an housing has been printed for an ARDUINO board. The watertightness of the housing has been tested by immersion at a depth of 1 m for 30 min, according to the UNE-EN 60529:2018 standard. Although it did not pass the test, the quantity of water that entered the casing was less than 0.5 g.
Pablo E. Romero; Antonio Agulló; Esther Molero. Manufacturing of Watertight Housing for Electronic Equipment by Fused Deposition Modeling. Introduction to Mechanical Engineering 2021, 363 -376.
AMA StylePablo E. Romero, Antonio Agulló, Esther Molero. Manufacturing of Watertight Housing for Electronic Equipment by Fused Deposition Modeling. Introduction to Mechanical Engineering. 2021; ():363-376.
Chicago/Turabian StylePablo E. Romero; Antonio Agulló; Esther Molero. 2021. "Manufacturing of Watertight Housing for Electronic Equipment by Fused Deposition Modeling." Introduction to Mechanical Engineering , no. : 363-376.
This work is aimed at describing the design of a mechanical and programmable 3D capturing system to be used by either 3D scanner or DSLR camera through photogrammetry. Both methods are widely used in diverse areas, from engineering, architecture or archaeology, up to the field of medicine; but they also entail certain disadvantages, such as the high costs of certain equipment, such as scanners with some precision, and the need to resort to specialized operatives, among others. The purpose of this design is to create a robust, precise and cost-effective system that improves the limitations of the present equipment on the market, such as robotic arms or rotary tables. For this reason, a preliminary study has been conducted to analyse the needs of improvement, later, we have focused on the 3D design and prototyping. For its construction, there have been used the FDM additive technology and structural components that are easy to find in the market. With regards to electronic components, basic electronics and Arduino-based 3D printers firmware have been selected. For system testing, the capture equipment consists of a Spider Artec 3D Scanner and a Nikon 5100 SLR Camera. Finally, 3D models have been developed by comparing the 3D meshes obtained by the two methods, obtaining satisfactory results.
Ramón González-Merino; Elena Sánchez-López; Pablo Romero; Jesús Rodero; Rafael Hidalgo-Fernández. Low-Cost Prototype to Automate the 3D Digitization of Pieces: An Application Example and Comparison. Sensors 2021, 21, 2580 .
AMA StyleRamón González-Merino, Elena Sánchez-López, Pablo Romero, Jesús Rodero, Rafael Hidalgo-Fernández. Low-Cost Prototype to Automate the 3D Digitization of Pieces: An Application Example and Comparison. Sensors. 2021; 21 (8):2580.
Chicago/Turabian StyleRamón González-Merino; Elena Sánchez-López; Pablo Romero; Jesús Rodero; Rafael Hidalgo-Fernández. 2021. "Low-Cost Prototype to Automate the 3D Digitization of Pieces: An Application Example and Comparison." Sensors 21, no. 8: 2580.
Metal molds have traditionally been used in the manufacture of polyurethane foam parts. This type of molds presents several disadvantages: have a high cost; need a long time for their manufacture; involve the use of release agents during the demolding operation. As an alternative, the use of molds manufactured by fused deposition modeling is proposed. These 3D printed molds have a poor surface finish, which complicates the demolding operation. To overcome this handicap, materials that can be chemically polished have been studied: acrylonitrile butadiene styrene and high impact polystyrene. Acrylonitrile butadiene styrene can be polished by exposure to acetone vapors and high impact polystyrene by immersion in limonene. This post-processing operation allows to reduce the surface roughness of the 3D printed mold. To simulate the industrial use of the mold, seven molding-demolding cycles have been performed. To measure the ease of demolding of each material, a pull-off test has been used. The results indicate that high impact polystyrene has less affinity with polyurethane foam than acrylonitrile butadiene styrene. In addition, although release agent is used in cycle 1, with high impact polystyrene specimens, it is not necessary to use it in cycles 2, 3 and 4; this means a saving of release agent. Furthermore, the chemical polishing of high impact polystyrene by immersion in limonene has several advantages: it is performed in a short time; it allows to obtain an excellent finish regardless of the initial surface roughness; it is done using a biodegradable solvent of organic origin. To experimentally demonstrate the viability of the proposed solution, a mold for the back of a car seat has been printed in high impact polystyrene via fused deposition modeling and chemically polished by immersion in limonene (1 min); the geometrical deviations generated were less than 1 mm.
Pablo E. Romero; Jose Arribas-Barrios; Oscar Rodriguez-Alabanda; Ramón González-Merino; Guillermo Guerrero-Vaca. Manufacture of polyurethane foam parts for automotive industry using FDM 3D printed molds. CIRP Journal of Manufacturing Science and Technology 2021, 32, 396 -404.
AMA StylePablo E. Romero, Jose Arribas-Barrios, Oscar Rodriguez-Alabanda, Ramón González-Merino, Guillermo Guerrero-Vaca. Manufacture of polyurethane foam parts for automotive industry using FDM 3D printed molds. CIRP Journal of Manufacturing Science and Technology. 2021; 32 ():396-404.
Chicago/Turabian StylePablo E. Romero; Jose Arribas-Barrios; Oscar Rodriguez-Alabanda; Ramón González-Merino; Guillermo Guerrero-Vaca. 2021. "Manufacture of polyurethane foam parts for automotive industry using FDM 3D printed molds." CIRP Journal of Manufacturing Science and Technology 32, no. : 396-404.
Electrolytic tough pitch copper is commonly used in electric and electronic applications while fine copper wires are widely used in electronic conductors. A multi-pass wiredrawing process was designed for the manufacturing of fine pure copper wire, from 0.50 mm to 0.10 mm in diameter. The analytical model and the finite element analysis (FEA) were performed to validate the pass schedule design. The initial wire was mechanically characterized, and the pass schedule design was stablished by the analytical method according to the specific criteria. The sequence of wiredrawing passes was modeled in the finite element method (FEM) software in order to analyze and validate the designed pass schedule. The combination of these methods allowed designing and validating the wiredrawing pass schedule to implement it in a real process with guaranteed results. This work contributes in showing a combined methodology for the design and virtual validation of the pass schedule in the case of multistage wiredrawing of ETP copper fine wires.
Oscar Rodríguez-Alabanda; Esther Molero; Marius Tintelecan; Guillermo Guerrero-Vaca; Pablo E. Romero; Gustavo Aristides Santana Martinez. Fine Electrolytic Tough Pitch Copper Multistage Wiredrawing Pass Schedule Design by Analytical and Numerical Methods. Proceedings 2020, 63, 12 .
AMA StyleOscar Rodríguez-Alabanda, Esther Molero, Marius Tintelecan, Guillermo Guerrero-Vaca, Pablo E. Romero, Gustavo Aristides Santana Martinez. Fine Electrolytic Tough Pitch Copper Multistage Wiredrawing Pass Schedule Design by Analytical and Numerical Methods. Proceedings. 2020; 63 (1):12.
Chicago/Turabian StyleOscar Rodríguez-Alabanda; Esther Molero; Marius Tintelecan; Guillermo Guerrero-Vaca; Pablo E. Romero; Gustavo Aristides Santana Martinez. 2020. "Fine Electrolytic Tough Pitch Copper Multistage Wiredrawing Pass Schedule Design by Analytical and Numerical Methods." Proceedings 63, no. 1: 12.
In the present work, ten data mining algorithms have been used to generate models capable of predicting the surface roughness of parts printed on polylactic acid (PLA) by using fused deposition modeling (FDM). The models have been trained using experimental data measured on 27 horizontal (XY) and 27 vertical (XZ) specimens, printed using different values for the parameters studied (layer height, extrusion temperature, print speed, print acceleration and flow). The models generated by multilayer perceptron (MLP) and logistic model trees (LMT) have obtained the best results in a cross-validation. Although it does not obtain such optimal results, the J48 algorithm (C4.5) allows the generation of models in the form of a decision tree. These trees permit to determine which print parameters have an influence on the surface roughness. For XY specimens, the surface roughness measured in the direction parallel to the extrusion path (Ra,0,XY ) depends on the flow, the print temperature and the layer height; in the direction perpendicular to the extrusion path, the surface roughness (Ra,90,XY) depends only on the flow. For XZ specimens, the surface roughness measured in the direction parallel to the extrusion path (Ra,0,XZ) depends only on the print speed; in the direction perpendicular to the extrusion path (Ra,90,XZ), it depends on the layer height and the extrusion temperature. According to the study carried out, the most suitable set up provides values of Ra,0,XY, Ra,90,XY, Ra,0,XZ and Ra,90,XZ equal to 0.46, 1.18, 0.45 and 11.54, respectively. A practical application of this work is the manufacture of PLA frame glasses using FDM.
Esther Molero; Juan Jesús Fernández; Oscar Rodríguez-Alabanda; Guillermo Guerrero-Vaca; Pablo E. Romero. Use of Data Mining Techniques for the Prediction of Surface Roughness of Printed Parts in Polylactic Acid (PLA) by Fused Deposition Modeling (FDM): A Practical Application in Frame Glasses Manufacturing. Polymers 2020, 12, 840 .
AMA StyleEsther Molero, Juan Jesús Fernández, Oscar Rodríguez-Alabanda, Guillermo Guerrero-Vaca, Pablo E. Romero. Use of Data Mining Techniques for the Prediction of Surface Roughness of Printed Parts in Polylactic Acid (PLA) by Fused Deposition Modeling (FDM): A Practical Application in Frame Glasses Manufacturing. Polymers. 2020; 12 (4):840.
Chicago/Turabian StyleEsther Molero; Juan Jesús Fernández; Oscar Rodríguez-Alabanda; Guillermo Guerrero-Vaca; Pablo E. Romero. 2020. "Use of Data Mining Techniques for the Prediction of Surface Roughness of Printed Parts in Polylactic Acid (PLA) by Fused Deposition Modeling (FDM): A Practical Application in Frame Glasses Manufacturing." Polymers 12, no. 4: 840.
Polytetrafluoroethylene (PTFE) coatings are used in many applications and processing industries. With their use, they wear out and lose properties and must be replaced by new ones if the cost of the element so advises. There are different stripping techniques, but almost all of them are very difficult and require strict environmental controls. It is a challenge to approach the process through efficient and more sustainable techniques. In the present work, we have studied the stripping of PTFE coatings by projection with abrasives (1 step) as an alternative to carbonization + sandblasting procedures (2 steps). For this purpose, different types of abrasives have been selected: brown corundum, white corundum, glass microspheres, plastic particles, and a walnut shell. The tests were performed at pressures from 0.4 to 0.6 MPa on PTFE-coated aluminium substrates of EN AW-5182 H111 alloy. Stripping rates, surface roughness, and substrate hardness have been studied. Scanning electron microscopy (SEM) images of sandblasted specimens have also been obtained. All abrasives improved mechanical and surface properties in one-step vs. two-step processes. The abrasives of plastic and glass microspheres are the most appropriate for the one-step process, which increases the hardness and roughness level Ra in the substrate. Corundum abrasives enable the highest stripping rates.
Guillermo Guerrero-Vaca; David Carrizo-Tejero; Óscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero. Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials. Materials 2020, 13, 799 .
AMA StyleGuillermo Guerrero-Vaca, David Carrizo-Tejero, Óscar Rodríguez-Alabanda, Pablo E. Romero, Esther Molero. Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials. Materials. 2020; 13 (3):799.
Chicago/Turabian StyleGuillermo Guerrero-Vaca; David Carrizo-Tejero; Óscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero. 2020. "Experimental Study for the Stripping of PTFE Coatings on Al-Mg Substrates Using Dry Abrasive Materials." Materials 13, no. 3: 799.
In order to increase the efficiency of the Spanish health system, minor surgery programs are currently carried out in primary care centers. This organizational change has led to the need to train many general practitioners (GPs) in this discipline on a practical level. Due to the cost of the existing minor surgery training models in the market, pig’s feet or chicken thighs are used to practice the removal of figured lesions and the suture of wounds. In the present work, the use of 3D printing is proposed, to manufacture models that reproduce in a realistic way the most common lesions in minor surgery practice, and that allow doctors to be trained in an adequate way. Four models with the most common dermal lesions have been designed and manufactured, and then evaluated by a panel of experts. Face validity was demonstrated with four items on a five-point Likert scale that was completed anonymously. The models have obtained the following results: aesthetic recreation, 4.6 ± 0.5; realism during anesthesia infiltration, 4.8 ± 0.4; realism during lesion removal, 2.8 ± 0.4; realism during surgical wound closure, 1.2 ± 0.4. The score in this last section could be improved if a more elastic skin-colored filament were found on the market.
M.C. Luque; A. Calleja-Hortelano; P.E. Romero. Use of 3D Printing in Model Manufacturing for Minor Surgery Training of General Practitioners in Primary Care. Applied Sciences 2019, 9, 5212 .
AMA StyleM.C. Luque, A. Calleja-Hortelano, P.E. Romero. Use of 3D Printing in Model Manufacturing for Minor Surgery Training of General Practitioners in Primary Care. Applied Sciences. 2019; 9 (23):5212.
Chicago/Turabian StyleM.C. Luque; A. Calleja-Hortelano; P.E. Romero. 2019. "Use of 3D Printing in Model Manufacturing for Minor Surgery Training of General Practitioners in Primary Care." Applied Sciences 9, no. 23: 5212.
Aluminum-magnesium (Al-Mg) alloy and aluminum-coated steel (aluminized steel) are typically used for the manufacturing of baking trays and molds. For these applications, these materials must be modified to develop release and hydrophobic properties. With this aim, the bare substrates are typically coated with low-surface energy materials such as fluoropolymers, elastomers, or sol-gel layers. In this work, some alternative strategies to prepare these functional surfaces are presented. We used three-step processes involving (i) micro-texturing, (ii) nano layer deposition through immersion and electrodeposition, and (iii) hydrophobization. The raw substrates were sanded or sandblasted at the micro scale, accordingly. Texturization at the nano scale was achieved with a cerium layer formed by electrodeposition or solution immersion. The cerium layers were hydrophobized with fatty acids. The wetting properties of the samples were studied with tilting-plate and bouncing drop methods. We measured the surface roughness of the samples by contact profiling and analyzed their surface morphology using a field emission scanning electron microscope (FESEM). The elemental chemical composition of the samples was analyzed by energy-dispersive X-ray spectroscopy (EDX). The wettability results indicated that the best performance for the Al-Mg substrates was reached by sandblasting and later immersion in a cerium nitrate solution. For aluminized steel substrates, the best results were obtained with both electrodeposition and immersion methods using a cerium chloride solution.
Guillermo Guerrero-Vaca; Miguel A. Rodríguez-Valverde; Pedro Castilla-Montilla; Francisco Alguacil-Salamanca; Óscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero-Romero; F. Javier Montes Ruiz-Cabello; F. Montes Ruiz-Cabello. Superhydrophobic Cerium-Based Coatings on Al-Mg Alloys and Aluminized Steel. Coatings 2019, 9, 774 .
AMA StyleGuillermo Guerrero-Vaca, Miguel A. Rodríguez-Valverde, Pedro Castilla-Montilla, Francisco Alguacil-Salamanca, Óscar Rodríguez-Alabanda, Pablo E. Romero, Esther Molero-Romero, F. Javier Montes Ruiz-Cabello, F. Montes Ruiz-Cabello. Superhydrophobic Cerium-Based Coatings on Al-Mg Alloys and Aluminized Steel. Coatings. 2019; 9 (12):774.
Chicago/Turabian StyleGuillermo Guerrero-Vaca; Miguel A. Rodríguez-Valverde; Pedro Castilla-Montilla; Francisco Alguacil-Salamanca; Óscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero-Romero; F. Javier Montes Ruiz-Cabello; F. Montes Ruiz-Cabello. 2019. "Superhydrophobic Cerium-Based Coatings on Al-Mg Alloys and Aluminized Steel." Coatings 9, no. 12: 774.
Fluoropolymers such as PFA are used as coatings for the protection of metal substrates due to their high chemical inertia and non-stick properties. These are “wear and tear” coatings and they degrade, at which point they should be removed for a new application. The removal of these types of coating by laser is of interest due to the process’s flexibility, precision, ease of automation, and environmental sustainability. The efficiency of the procedure was shown with the use of a source in a pulsed Nd:YAG and a source in continuous mode of fiber (Yb). The rates of stripping (cm2/min) and fluence (J/cm2) were analyzed and related to the power of the laser sources. Variations of the substrate after stripping were studied: roughness and hardness. The properties of the coating, thickness, roughness, water sliding angle, and microhardness were also evaluated. It was concluded that the laser in continuous mode was more efficient than the pulsed laser; laser removal of fluoropolymers has a strong relationship with reflectivity, and the mechanical and surface properties of the substrate after stripping remained virtually unchanged.
Guillermo Guerrero-Vaca; Óscar Rodríguez-Alabanda; Pablo E. Romero; Carlos Soriano; Esther Molero; Jon Lambarri. Stripping of PFA Fluoropolymer Coatings Using a Nd:YAG Laser (Q-Switch) and an Yb Fiber Laser (CW). Polymers 2019, 11, 1738 .
AMA StyleGuillermo Guerrero-Vaca, Óscar Rodríguez-Alabanda, Pablo E. Romero, Carlos Soriano, Esther Molero, Jon Lambarri. Stripping of PFA Fluoropolymer Coatings Using a Nd:YAG Laser (Q-Switch) and an Yb Fiber Laser (CW). Polymers. 2019; 11 (11):1738.
Chicago/Turabian StyleGuillermo Guerrero-Vaca; Óscar Rodríguez-Alabanda; Pablo E. Romero; Carlos Soriano; Esther Molero; Jon Lambarri. 2019. "Stripping of PFA Fluoropolymer Coatings Using a Nd:YAG Laser (Q-Switch) and an Yb Fiber Laser (CW)." Polymers 11, no. 11: 1738.
For the wiredrawing of aluminium, the initial wire rod is obtained by continuous inverted casting. The raw geometry is industrially processed in a linear multi-step wiredrawing sequence to obtain a wire that is commonly used for the manufacture of electrical conductors. In the present work a complete study of the material has been made. The experimental procedure consisted in the realization of a sequence of section reduction stages in the laboratory, a sequence designed following the technological criteria recommended by the manufacturer of the drawing machine in which the industrial process will be implemented. From the specimens corresponding to each reduction step, it has been possible to know the evolution of the main mechanical properties when this pure aluminium is processed by wiredrawing. This information has led to establish the hardening law by which it is possible characterize the plastic behaviour of this pure metal when it is transformed by this specific sequential process of cold forming. The strain hardening law has been implemented in a numerical simulation software application and the experimental setup has been simulated for its validation. Finally, the classic analytical solution founded in the “slab method” has been applied for the design of a proposal for the optimization of the industrial wiredrawing process.
Óscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero; Guillermo Guerrero-Vaca. Analysis, Validation and Optimization of the Multi-Stage Sequential Wiredrawing Process of EN AW-1370 Aluminium. Metals 2019, 9, 1021 .
AMA StyleÓscar Rodríguez-Alabanda, Pablo E. Romero, Esther Molero, Guillermo Guerrero-Vaca. Analysis, Validation and Optimization of the Multi-Stage Sequential Wiredrawing Process of EN AW-1370 Aluminium. Metals. 2019; 9 (9):1021.
Chicago/Turabian StyleÓscar Rodríguez-Alabanda; Pablo E. Romero; Esther Molero; Guillermo Guerrero-Vaca. 2019. "Analysis, Validation and Optimization of the Multi-Stage Sequential Wiredrawing Process of EN AW-1370 Aluminium." Metals 9, no. 9: 1021.
3D printing using fused deposition modeling (FDM) includes a multitude of control parameters. It is difficult to predict a priori what surface finish will be achieved when certain values are set for these parameters. The objective of this work is to compare the models generated by decision tree algorithms (C4.5, random forest, and random tree) and to analyze which makes the best prediction of the surface roughness in polyethylene terephthalate glycol (PETG) parts printed in 3D using the FDM technique. The models have been created using a dataset of 27 instances with the following attributes: layer height, extrusion temperature, print speed, print acceleration, and flow rate. In addition, a dataset has been created to evaluate the models, consisting of 15 additional instances. The models generated by the random tree algorithm achieve the best results for predicting the surface roughness in FDM parts.
Juan M. Barrios; Pablo E. Romero. Decision Tree Methods for Predicting Surface Roughness in Fused Deposition Modeling Parts. Materials 2019, 12, 2574 .
AMA StyleJuan M. Barrios, Pablo E. Romero. Decision Tree Methods for Predicting Surface Roughness in Fused Deposition Modeling Parts. Materials. 2019; 12 (16):2574.
Chicago/Turabian StyleJuan M. Barrios; Pablo E. Romero. 2019. "Decision Tree Methods for Predicting Surface Roughness in Fused Deposition Modeling Parts." Materials 12, no. 16: 2574.
The fused deposition modeling (FDM) technique is used today by companies engaged in the fabrication of traffic signs for the manufacture of light-emitting diode LED spotlights. In this sector, the surface properties of the elements used (surface finish, hydrophobic features) are decisive because surfaces that retain little dirt and favor self-cleaning behavior are needed. A design of experiments (L27) with five factors and three levels has been carried out. The factors studied were: Layer height (LH), print temperature (T), print speed (PS), print acceleration (PA), and flow rate (F). Polyethylene terephthalate glycol (PETG) specimens of 25.0 × 25.0 × 2.4 mm have been printed and, in each of them, the surface roughness (Ra,0, Ra,90), sliding angle (SA0, SA90), and contact angle (CA0, CA90) in both perpendicular directions have been measured. Taguchi and ANOVA analysis shows that the most influential variables in this case are printing acceleration for Ra, 0 (p-value = 0.052) and for SA0 (p-value = 0.051) and flow rate for Ra, 90 (p-value = 0.001) and for SA90 (p-value = 0.012). Although the ANOVA results for the contact angle are not significant, specimen 8 (PA = 1500 mm/s2 and flow rate F = 110%) and specimen 10 (PA =1500 mm/s2 and F = 100%) have reached contact angle values above or near the limit value for hydrophobia, respectively.
Juan M. Barrios; Pablo E. Romero. Improvement of Surface Roughness and Hydrophobicity in PETG Parts Manufactured via Fused Deposition Modeling (FDM): An Application in 3D Printed Self-Cleaning Parts. Materials 2019, 12, 2499 .
AMA StyleJuan M. Barrios, Pablo E. Romero. Improvement of Surface Roughness and Hydrophobicity in PETG Parts Manufactured via Fused Deposition Modeling (FDM): An Application in 3D Printed Self-Cleaning Parts. Materials. 2019; 12 (15):2499.
Chicago/Turabian StyleJuan M. Barrios; Pablo E. Romero. 2019. "Improvement of Surface Roughness and Hydrophobicity in PETG Parts Manufactured via Fused Deposition Modeling (FDM): An Application in 3D Printed Self-Cleaning Parts." Materials 12, no. 15: 2499.
Fluoropolymer-based coatings are widely used for release applications. However, these hydrophobic surfaces do not reveal a significantly low adhesion. Water repellency incorporated to fluoropolymer coatings might enhance their release performance. In this work, we focused on the surface texturing of a well-known polytetrafluoroethylene (PTFE)-based coating. We explored as texturing routes: sanding, sandblasting and laser ablation. We examined the surface roughness with white light confocal microscopy and the surface morphology with environmental scanning electron microscopy (ESEM). Water-repellent fluoropolymer coatings were reproduced in all cases, although with different degree, parametrized with bounces of water drops (4–5 μL). Laser ablation enabled the lowest adhesion of coatings with 24 ± 2 bounces. This result and the current development of laser patterning for industry assure the incipient use of laser ablation for release coatings.
Guillermo Paz-Gómez; Juan Carlos Del Caño-Ochoa; Oscar Rodríguez Alabanda; Pablo E. Romero; Miguel Cabrerizo-Vílchez; Guillermo Guerrero; Miguel Angel Rodríguez-Valverde; Paz- Gómez; Caño- Ochoa; Rodríguez- Alabanda; Cabrerizo- Vílchez; Guerrero- Vaca; Rodríguez- Valverde. Water-Repellent Fluoropolymer-Based Coatings. Coatings 2019, 9, 293 .
AMA StyleGuillermo Paz-Gómez, Juan Carlos Del Caño-Ochoa, Oscar Rodríguez Alabanda, Pablo E. Romero, Miguel Cabrerizo-Vílchez, Guillermo Guerrero, Miguel Angel Rodríguez-Valverde, Paz- Gómez, Caño- Ochoa, Rodríguez- Alabanda, Cabrerizo- Vílchez, Guerrero- Vaca, Rodríguez- Valverde. Water-Repellent Fluoropolymer-Based Coatings. Coatings. 2019; 9 (5):293.
Chicago/Turabian StyleGuillermo Paz-Gómez; Juan Carlos Del Caño-Ochoa; Oscar Rodríguez Alabanda; Pablo E. Romero; Miguel Cabrerizo-Vílchez; Guillermo Guerrero; Miguel Angel Rodríguez-Valverde; Paz- Gómez; Caño- Ochoa; Rodríguez- Alabanda; Cabrerizo- Vílchez; Guerrero- Vaca; Rodríguez- Valverde. 2019. "Water-Repellent Fluoropolymer-Based Coatings." Coatings 9, no. 5: 293.
The coatings with fluoropolymer resins rich in fluorinated ethylene propylene (FEP) and polytetrafluoroethylene (PTFE) are applied as anti-adherent coatings on aluminum–magnesium substrates for use in food containers. In many cases, due to wear, they must be stripped for the application of a new coating on the same substrate. There are several processes for this: blasting, plasma, pyrolysis, chemical processes, laser, high pressure water, and combinations of these. This work focuses on the characterization of the main factors that condition the FEP coating removal process by a continuous wave (CW) Nd:YAG laser, and on the determination of the efficiency of this type of technology used for this purpose. Stripping surface per unit of time and energy consumption per unit area has been determined among other efficiency indicators. Regarding the characterization of the coating object of study, its thickness, surface roughness, contact angle, microhardness and absorbance-reflectance responses have been determined, and the results have been compared with those obtained in the case of PTFE. In addition, to evaluate the mechanical damage caused in the substrate after coating removal by (CW) Nd:YAG laser, the tensile strength, Vickers hardness, Ra and Rz roughness, and the substrate thickness have been measured and analyzed.
Óscar Rodríguez-Alabanda; Pablo E. Romero; Carlos Soriano; Lorenzo Sevilla; Guillermo Guerrero-Vaca. Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser. Polymers 2019, 11, 123 .
AMA StyleÓscar Rodríguez-Alabanda, Pablo E. Romero, Carlos Soriano, Lorenzo Sevilla, Guillermo Guerrero-Vaca. Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser. Polymers. 2019; 11 (1):123.
Chicago/Turabian StyleÓscar Rodríguez-Alabanda; Pablo E. Romero; Carlos Soriano; Lorenzo Sevilla; Guillermo Guerrero-Vaca. 2019. "Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser." Polymers 11, no. 1: 123.
In the present work, a technique for forming non-stick molds from pre-coated sheets via single-point incremental deformation is explained. Four truncated pyramidal geometry specimens have been formed and the characteristics of the coating after deformation (thickness, roughness, adhesion to the substrate and pencil hardness) have been measured. Coating characteristics in deformed areas are slightly lower than those measured in non-deformed areas. In any case, the values obtained are compatible with the standards used in the sector dedicated to the manufacture of molds for alimentary use.
O. Rodriguez-Alabanda; R. Molleja Molleja; G. Guerrero-Vaca; P.E. Romero. Direct manufacturing of non-stick molds via single point incremental forming. Procedia Manufacturing 2019, 41, 1135 -1140.
AMA StyleO. Rodriguez-Alabanda, R. Molleja Molleja, G. Guerrero-Vaca, P.E. Romero. Direct manufacturing of non-stick molds via single point incremental forming. Procedia Manufacturing. 2019; 41 ():1135-1140.
Chicago/Turabian StyleO. Rodriguez-Alabanda; R. Molleja Molleja; G. Guerrero-Vaca; P.E. Romero. 2019. "Direct manufacturing of non-stick molds via single point incremental forming." Procedia Manufacturing 41, no. : 1135-1140.
This work focuses on obtaining superhydrophobic surfaces on an aluminium-magnesium substrate for industrial use in a simple and relatively inexpensive way. For this purpose, texturing techniques have been used by sanding with paper, sandblasting with abrasives and hydrophobization by cathodic electrodeposition and immersion in cerium saline solutions. For the determination of superhydrofobicity, the sliding angle, advance and receding angle, number of bounces and determination of surface morphology have been measured. Both cathodic electrodeposition and immersion techniques have been used to obtain superhydrofobicity on the surface. Sliding angles up to 0 ° have been obtained and advancing angles higher than 150 °.
G. Guerrero-Vacas; P. Castilla-Montilla; P.E. Romero-Carrillo; J. Montes Ruiz-Cabello; O. Rodríguez-Alabanda. Superhydrophobic aluminum-magnesium surfaces obtained with cerium coatings. Procedia Manufacturing 2019, 41, 18 -25.
AMA StyleG. Guerrero-Vacas, P. Castilla-Montilla, P.E. Romero-Carrillo, J. Montes Ruiz-Cabello, O. Rodríguez-Alabanda. Superhydrophobic aluminum-magnesium surfaces obtained with cerium coatings. Procedia Manufacturing. 2019; 41 ():18-25.
Chicago/Turabian StyleG. Guerrero-Vacas; P. Castilla-Montilla; P.E. Romero-Carrillo; J. Montes Ruiz-Cabello; O. Rodríguez-Alabanda. 2019. "Superhydrophobic aluminum-magnesium surfaces obtained with cerium coatings." Procedia Manufacturing 41, no. : 18-25.
In the industrial process of multi-stage sequential drawing, the previously annealed wire is passed through a series of rows arranged consecutively by means of a traction system, progressively reducing its section while its length increases, causing the metal to harden. In the present work a complete study of the material has been made, before and during the multi-stage wiredrawing process, to know the evolution of its main mechanical properties when being processed by drawing in successive stages. The results obtained have allowed to establish a hardening law with great utility to predict the plastic behaviour of this metal when it is transformed by this process. The study has been completed with a series of FEM simulations performed on the method of finite element analysis which have allowed to implement the behaviour law established from the experimental work and analyze the sequential process by numerical method. Key Words: wire drawing, electrolytic copper, finite element method, mechanical properties, strain hardening
Oscar Rodríguez Alabanda; Guillermo Guerrero Vacas; Lorenzo Sevilla Hurtado; Pablo Eduardo Romero Carrillo. DETERMINATION OF THE STRAIN HARDENING LAW OF ELECTROLITIC COPPER PROCESSED BY WIREDARWING. DYNA 2019, 94, 46 -52.
AMA StyleOscar Rodríguez Alabanda, Guillermo Guerrero Vacas, Lorenzo Sevilla Hurtado, Pablo Eduardo Romero Carrillo. DETERMINATION OF THE STRAIN HARDENING LAW OF ELECTROLITIC COPPER PROCESSED BY WIREDARWING. DYNA. 2019; 94 (1):46-52.
Chicago/Turabian StyleOscar Rodríguez Alabanda; Guillermo Guerrero Vacas; Lorenzo Sevilla Hurtado; Pablo Eduardo Romero Carrillo. 2019. "DETERMINATION OF THE STRAIN HARDENING LAW OF ELECTROLITIC COPPER PROCESSED BY WIREDARWING." DYNA 94, no. 1: 46-52.
This work studies the relationship between different geometrical parameters of the contour of a polygonal pocket and the time needed to machining that pocket, using zigzag strategy. The geometrical parameters used to characterize the pockets are typical of image analysis techniques: form factor, elongation index and minimal enclosing circle ratio. Ten different polygonal pockets were studied, all with the same area. The time invested in each case was measured experimentally. The results show that there is a relationship between the three geometric parameters and the time invested in pocketing. These results can be useful for designers to estimate a priori the polygonal geometries whose machining consumes less time.
Oscar Rodriguez-Alabanda; Guillermo Guerrero-Vacas; Pablo E. Romero. Machining time estimation using the geometrics features of the 2.5D pocket contour. Procedia Manufacturing 2019, 41, 508 -515.
AMA StyleOscar Rodriguez-Alabanda, Guillermo Guerrero-Vacas, Pablo E. Romero. Machining time estimation using the geometrics features of the 2.5D pocket contour. Procedia Manufacturing. 2019; 41 ():508-515.
Chicago/Turabian StyleOscar Rodriguez-Alabanda; Guillermo Guerrero-Vacas; Pablo E. Romero. 2019. "Machining time estimation using the geometrics features of the 2.5D pocket contour." Procedia Manufacturing 41, no. : 508-515.