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Fixtures are a critical element in machining operations as they are the interface between the part and the machine. These components are responsible for the precise part location on the machine table and for the proper dynamic stability maintenance during the manufacturing operations. Although these two features are deeply related, they are usually studied separately. On the one hand, diverse adaptable solutions have been developed for the clamping of different variable geometries. Parallelly, the stability of the part has been long studied to reduce the forced vibration and the chatter effects, especially on thin parts machining operations typically performed in the aeronautic field, such as the skin panels milling. The present work proposes a commitment between both features by the presentation of an innovative vacuum fixture based on the use of a vulcanized rubber layer. This solution presents high flexibility as it can be adapted to different geometries while providing a proper damping capacity due to the viscoelastic and elastoplastic behaviour of these compounds. Moreover, the sealing properties of these elastomers provide the perfect combination to transform a rubber layer into a flexible vacuum table. Therefore, in order to validate the suitability of this fixture, a test bench is manufactured and tested under uniaxial compression loads and under real finish milling conditions over AA2024 part samples. Finally, a roughness model is proposed and analysed in order to characterize the part vibration sources.
Antonio Rubio-Mateos; Mikel Casuso; Asuncion Rivero; Eneko Ukar; Aitzol Lamikiz. Vibrations characterization in milling of low stiffness parts with a rubber-based vacuum fixture. Chinese Journal of Aeronautics 2020, 34, 54 -66.
AMA StyleAntonio Rubio-Mateos, Mikel Casuso, Asuncion Rivero, Eneko Ukar, Aitzol Lamikiz. Vibrations characterization in milling of low stiffness parts with a rubber-based vacuum fixture. Chinese Journal of Aeronautics. 2020; 34 (6):54-66.
Chicago/Turabian StyleAntonio Rubio-Mateos; Mikel Casuso; Asuncion Rivero; Eneko Ukar; Aitzol Lamikiz. 2020. "Vibrations characterization in milling of low stiffness parts with a rubber-based vacuum fixture." Chinese Journal of Aeronautics 34, no. 6: 54-66.
In finishing processes, the quality of aluminum parts is mostly influenced by static and dynamic phenomena. Different solutions have been studied toward a stable milling process attainment. However, the improvements obtained with the tuning of process parameters are limited by the system stiffness and external dampers devices interfere with the machining process. To deal with this challenge, this work analyzes the suitability of elastomer layers as passive damping elements directly located under the part to be machined. Thus, exploiting the sealing properties of nitrile butadiene rubber (NBR), a suitable flexible vacuum fixture is developed, enabling a proper implementation in the manufacturing process. Two different compounds are characterized under axial compression and under finishing operations. The compression tests present the effect of the feed rate and the strain accumulative effect in the fixture compressive behavior. Despite the higher strain variability of the softer rubber, different milling process parameters, such as the tool feed rate, can lead to a similar compressive behavior of the fixture regardless the elastomer hardness. On the other hand, the characterization of these flexible fixtures is completed over AA2024 floor milling of rigid parts and compared with the use of a rigid part clamping. These results show that, as the cutting speed and the feed rate increases, due to the strain evolution of the rubber, the part quality obtained tend to equalize between the flexible and the rigid clamping of the workpiece. Due to the versatility of the NBR for clamping different part geometries without new fixture redesigns, this leads to a competitive advantage of these flexible solutions against the classic rigid vacuum fixtures. Finally, a model to predict the grooving forces with a bull-nose end mill regardless of the stiffness of the part support is proposed and validated for the working range.
Antonio Rubio-Mateos; Asuncion Rivero; Eneko Ukar; Aitzol Lamikiz. Influence of Elastomer Layers in the Quality of Aluminum Parts on Finishing Operations. Metals 2020, 10, 289 .
AMA StyleAntonio Rubio-Mateos, Asuncion Rivero, Eneko Ukar, Aitzol Lamikiz. Influence of Elastomer Layers in the Quality of Aluminum Parts on Finishing Operations. Metals. 2020; 10 (2):289.
Chicago/Turabian StyleAntonio Rubio-Mateos; Asuncion Rivero; Eneko Ukar; Aitzol Lamikiz. 2020. "Influence of Elastomer Layers in the Quality of Aluminum Parts on Finishing Operations." Metals 10, no. 2: 289.
The incipient implementation of the Industry 4.0 paradigm has led to an increase in the machines sensoring level, in the processes optimization and, thus, in the product manufacturing with a higher added value. In this article a new aspect is described where, through the machine monitoring, the utilization of innovative elements as fixture is enabled for high quality machining processes. These innovative elements are characterized by the great flexibility offered by them as holding component and by their low costs. However, these elements lack the enough geometrical accuracy for applications where a high shape and surface quality product are needed. First of all, in order to have a clear vision of the singularities of each fixture type present on the state of the art, a nomenclature and a classification has been proposed based on their geometry characteristics. Hence, based on this classification, an analysis of the different fixturing solutions provided by the market has been made, enhancing the advantages of this solution against the existing ones. With the aim of demonstrating its suitability for certain machining applications, the behavior of these sort of flexible materials has been characterized. Besides, the sensors implementation has been analyzed in order to capacitate this solution for processes where tough tolerances on parts are demanded. Therefore, this survey demonstrates that, through the massive information gathering, not only an optimization of the existing technologies is obtained, but it is possible to develop innovative solutions that provide improved capacities to the already existing ones in the Industry. Keywords: Flexible fixtures, fixtures classification, elastomers characterization, laser technology, accurate machining, Industry 4.0.
Antonio Rubio-Mateos; Asun Rivero Rastrero; Irene Del Sol Illana; Eneko Ukar Arrien; Aitzol Lamikiz Mentxaka. CAPACITATION OF FLEXIBLES FIXTURES FOR ITS USE IN HIGH QUALITY MACHINING PROCESSES: AN APPLICATION CASE OF THE INDUSTRY 4.0. PARADIGM. DYNA 2018, 93, 608 -612.
AMA StyleAntonio Rubio-Mateos, Asun Rivero Rastrero, Irene Del Sol Illana, Eneko Ukar Arrien, Aitzol Lamikiz Mentxaka. CAPACITATION OF FLEXIBLES FIXTURES FOR ITS USE IN HIGH QUALITY MACHINING PROCESSES: AN APPLICATION CASE OF THE INDUSTRY 4.0. PARADIGM. DYNA. 2018; 93 (1):608-612.
Chicago/Turabian StyleAntonio Rubio-Mateos; Asun Rivero Rastrero; Irene Del Sol Illana; Eneko Ukar Arrien; Aitzol Lamikiz Mentxaka. 2018. "CAPACITATION OF FLEXIBLES FIXTURES FOR ITS USE IN HIGH QUALITY MACHINING PROCESSES: AN APPLICATION CASE OF THE INDUSTRY 4.0. PARADIGM." DYNA 93, no. 1: 608-612.
Antonio Rubio-Mateos; Luis Calleja; Javier Orive; Ángel Mújica; Asunción Rivero. Flexible Machining System for an Efficient Skin Machining. SAE Technical Paper Series 2016, 1 .
AMA StyleAntonio Rubio-Mateos, Luis Calleja, Javier Orive, Ángel Mújica, Asunción Rivero. Flexible Machining System for an Efficient Skin Machining. SAE Technical Paper Series. 2016; ():1.
Chicago/Turabian StyleAntonio Rubio-Mateos; Luis Calleja; Javier Orive; Ángel Mújica; Asunción Rivero. 2016. "Flexible Machining System for an Efficient Skin Machining." SAE Technical Paper Series , no. : 1.
Juan Carlos Antolín-Urbaneja; Juan Livinalli; Mildred Puerto; Mikel Liceaga; Antonio Rubio-Mateos; Angel San-Roman; Igor Goenaga. End-Effector for Automatic Shimming of Composites. SAE Technical Paper Series 2016, 1 .
AMA StyleJuan Carlos Antolín-Urbaneja, Juan Livinalli, Mildred Puerto, Mikel Liceaga, Antonio Rubio-Mateos, Angel San-Roman, Igor Goenaga. End-Effector for Automatic Shimming of Composites. SAE Technical Paper Series. 2016; ():1.
Chicago/Turabian StyleJuan Carlos Antolín-Urbaneja; Juan Livinalli; Mildred Puerto; Mikel Liceaga; Antonio Rubio-Mateos; Angel San-Roman; Igor Goenaga. 2016. "End-Effector for Automatic Shimming of Composites." SAE Technical Paper Series , no. : 1.