Browsing by Author "Penalva, Mari Luz"
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Item On-Line Monitoring of Blind Fastener Installation Process(2019) Camacho, Javier; Veiga, Fernando; Penalva, Mari Luz; Diez-Olivan, Alberto; Deitert, Lutz; López de Lacalle, Norberto; Tecnalia Research & Innovation; FABRIC_INTELBlind fasteners are of special interest for aircraft construction since they allow working on joints where only one side is accessible, as is the case in many common aerospace box-type structures, such as stabilizers and flaps. This paper aims to deliver an online monitoring method for the detection of incorrect installed blind fasteners. In this type of fastener, the back side of the assembly is not accessible, so monitoring the process installation is suitable as a system to assess the formed head at the back side with no access. The solution proposed consists of an on-line monitoring system that is based on sensor signals acquired during the installation. The signals are conveniently analyzed in order to provide an evaluation outcome on how the fastener was installed. This new method will help production to decrease/eliminate time and cost-intensive inspections and fasteners over installation in structures. The decrease of the number of installed fasteners will also contribute to weight savings and will reduce the use of resources.Item Predicted Torque Model in Low-Frequency-Assisted Boring (LFAB) Operations(2021-06-24) Veiga, Fernando; Gil Del Val, Alain; Penalva, Mari Luz; Pereira, Octavio; Suárez, Alfredo; López de Lacalle Marcaide, Luis Norberto; Tecnalia Research & Innovation; FABRIC_INTELA low-frequency-assisted boring operation is a key cutting process in the aircraft manufacturing sector when drilling deep holes to avoid chip clogging based on chip breakage and, consequently, to reduce the temperature level in the cutting process. This paper proposes a predicted force model based on a commercial control-supported chip breaking function without external vibration devices in the boring operations. The model was fitted by conventional boring measurements and was validated by vibration boring experiments with different ranges of amplitude and frequency. The average prediction error is around 10%. The use of a commercial function makes the model more attractive for the industry because there is no need for intrusive vibration sensors. The low-frequency assisted boring (LFAB) operations foster the chip breakage. Finally, the model is generic and can be used for different cutting materials and conditions. Roughness is improved by 33% when vibration conditions are optimal, considered as a vibration amplitude of half the feed per tooth. This paper presents, as a novelty, the analysis of low-frequency vibration parameters in boring processes and their effect on chip formation and internal hole roughness. This has a practical significance for the definition of a methodology based on the torque model for the selection of conditions on other hole-making processes, cutting parameters and/or materials.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (BE)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (DE)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (EPO)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (ES)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (FR)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (GB)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (IT)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (PCT)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.Item Tool for the friction stir welding of two metal items with an angled joint having a pin and a wedge-shaped shoulder (SE)(2008-03-03) Martínez, Leonardo; Penalva, Mari Luz; Otaegui, AmaiaThe invention relates to a tool for the friction stir welding of two metal items with a joint angle of less than 180 DEG , comprised of a shoulder and a pin which exits from said shoulder. Said shoulder is wedge-shaped, with two walls forming an angle equal to the angle of the joint of the two metal items and with an interference zone at the meeting point of said walls. The interference zone is configured so as to penetrate the metal items at the angle of their joint. The pin exits from said interference zone. The shoulder being thus configured, it may concentrate the pressure on the area on which the pin operates.