Oscar Gonzalo

@tekniker.es

Mechanical engineering
Fundación Tekniker



           

https://researchid.co/ogonzalo
27

Scopus Publications

Scopus Publications

  • A method for the 3D identification of the center of gravity of an aircraft
    Oscar Gonzalo, Jose Maria Seara, Brahim Ahmed Chekh, Iñigo Berreteaga, Maurizio Marrocu, and Enrico Rotondi
    Elsevier BV


  • Preface


  • Case Study 2.4: Machining of Aircraft Turbine Support Structures
    Oscar Gonzalo, Jose Mari Seara, Enrique Guruceta, Mikel Esparta, Iker Zamakona, Nicolas Uterga, Axier Aranburu, and Johannes Thoelen
    Springer International Publishing

  • Case Study 1.2: Turning of Low Pressure Turbine Casing
    Oscar Gonzalo, Jose Mari Seara, Eneko Olabarrieta, Mikel Esparta, Iker Zamakona, Manu Gomez-Korraletxe, and José Alberto de Dios
    Springer International Publishing

  • A method to minimize the workpiece deformation using a concept of intelligent fixture
    Oscar Gonzalo, Jose Mari Seara, Enrique Guruceta, Alberto Izpizua, Mikel Esparta, Iker Zamakona, Nicolas Uterga, Axier Aranburu, and Johannes Thoelen
    Elsevier BV

  • Ultrasonically assisted drilling of carbon fibre reinforced plastics and Ti6Al4V
    Alejandro Sanda, Iban Arriola, Virginia Garcia Navas, Ion Bengoetxea, and Oscar Gonzalo
    Elsevier BV

  • Machinability of Al-SiC metal matrix composites using WC, PCD and MCD inserts
    Oscar Gonzalo, Jokin Beristain, and Alejandro Sandá
    Editorial CSIC
    The aim of this work is the study of the machinability of aluminium-silicon carbide Metal Matrix Composites (MMC) in turning operations. The cutting tools used were hard metal (WC) with and without coating, different grades and geometries of Poly-Crystalline Diamond (PCD) and Mono-Crystalline Diamond (MCD). The work piece material was AMC225xe, composed of aluminium-copper alloy AA 2124 and 25% wt of SiC, being the size of the SiC particles around 3 μm. Experiments were conducted at various cutting speeds and cutting parameters in facing finishing operations, measuring the surface roughness, cutting forces and tool wear. The worn surface of the cutting tool was examined by Scanning Electron Microscope (SEM). It was observed that the Built Up Edge (BUE) and stuck material is higher in the MCD tools than in the PCD tools. The BUE acts as a protective layer against abrasive wear of the tool.

  • Mechanisms involved in the improvement of Inconel 718 machinability by laser assisted machining (LAM)
    Virginia Garcí;a Navas, Iban Arriola, Oscar Gonzalo, and Josu Leunda
    Elsevier BV

  • Concept design of a 5-axis portable milling machine for the in-situ processing of large pieces


  • Ultrasound assisted extrusion of polyamide 6 nanocomposites based on carbon banotubes
    M. Blanco, J. A. Sarasua, M. López, O. Gonzalo, A. Marcaide, M. Muniesa, and A. Fernández
    Wiley
    Summary: Polyamide 6 (PA6)/multiwall carbon nanotubes (MWCNTs) nanocomposites have been prepared by an extrusion process assisted by ultrasounds. The ultrasounds system has been incorporated at the extrusion die, when the material is flowing through the exit channel. The application of an ultrasound field to a polymer melt has been shown a very efficient method to improve productivity of the process. When ultrasounds are applied, the extrudate flow is highly enhanced maintaining the same processing conditions. In addition, the ultrasounds contribute to the deagglomeration of CNTs into the matrix, as can be conclude from the drop in the electrical resistivity values of the nanocomposites observed when ultrasounds are applied. For the system PA6/MWCNT 7wt%., the electrical resistivity increases three orders of magnitude when ultrasounds are employed during the extrusion. In addition, a high reduction in the electrical percolation index is obtained for nanocomposites extrudated by the assistance of ultrasounds.

  • Effect of cutting parameters in the surface residual stresses generated by turning in AISI 4340 steel
    Virginia García Navas, Oscar Gonzalo, and Ion Bengoetxea
    Elsevier BV

  • Possibilities of rotary ultrasonic machining in order to give a boost to technical ceramics in the actual Spanish market
    I. Arriola, O. Gonzalo, and I. Bengoetxea
    Elsevier BV
    espanolLas propiedades mecanicas de las ceramicas tecnicas son adecuadas para aplicaciones en diferentes sectores como la medicina (protesis,...), automovil (rodamientos,….), aeroespacial (loseta,…), optica (laser,…), etc. donde se requieren caracteristicas como la gran resistencia al desgaste, alta dureza y estabilidad termoquimica. Sin embargo, la fabricacion de estos materiales es dificil y costosa, en algunos casos alcanzando el 90% del coste final, por lo que su aplicacion esta limitada. Este trabajo presenta el mecanizado por ultrasonidos rotatorio (RUM) como un proceso no convencional que permite la fabricacion de piezas ceramicas con geometrias 3D complejas de manera ecologica y economica. Este metodo consiste en la eliminacion de material utilizando una herramienta superabrasiva dotada de 3 movimientos: rotacion, vibracion axial ultrasonica (20 KHz) y avance contra la pieza fija. Este proceso combina el rectificado convencional y el mecanizado por ultrasonidos logrando mayores volumenes de material evacuado manteniendo las fuerzas de corte bajas. De esta manera, se superan las limitaciones de los metodos convencionales utilizados actualmente, obteniendo procesos mas precisos, flexibles y economicos. En definitiva, el RUM es un proceso prometedor para las operaciones de mecanizado de ceramicas estructurales. Sus caracteristicas permitiran fomentar el uso de las ceramicas en un mayor numero de aplicaciones industriales. EnglishThe advanced properties of engineering ceramics are suitable to meet the requirements of several engineering applications such as medical (prosthesis…), automotive (bearing...), aerospace (tiles,...), optics (lasers,…) and so on, where high hardness, high wear resistance and thermo chemical stability are needed. However, the processing of these materials is difficult and costly, in some cases up to 90% of the price, which leads ceramics to limited applications. Rotary Ultrasonic Machining (RUM) is presented as a non conventional environmental-friendly and cost effective process that enables to obtain complex 3D shape ceramic products. A rotating tool with metal-bonded diamond abrasives is ultrasonically vibrated (typically 20KHz) and fed toward to the fixed workpiece at a constant pressure or a constant feed rate This process combines conventional grinding and ultrasonic machining, offering the possibility of increased material removal rates while keeping the machining forces low. Thus, the limitations of actually used conventional processes are overcome introducing more accurate, flexible and cost effective process capabilities. On balance, RUM is a promising process for primary machining operations on structural ceramic components. Its features will lead to enhance the use of ceramics in more industrial applications by increasing product development/design capabilities, high added value products and sustainable process.

  • FEM based design of a chip breaker for the machining with PCD tools
    Oscar Gonzalo, Iban Quintana, and Jon Etxarri
    Trans Tech Publications, Ltd.
    This paper presents a methodology to design and manufacture a chip breaker in a PCD turning tool. The objective is to avoid the surface roughness and chip evacuation problems produced by long chips in turning processes. An analysis of the process is made to design a suitable chip breaker shape for semi-roughing and finishing operations in aluminum turning. FEM simulation and experimental test are used to understand the chip formation and breakage processes leading to improved chip breaker geometry. The new designed geometries are micromachined with laser in the PCD tools, and the improvement in the chip control is proved experimentally.

  • Simulation of low rigidity part machining applied to thin-walled structures
    Lionel Arnaud, Oscar Gonzalo, Sébastien Seguy, Haritz Jauregi, and Grégoire Peigné
    Springer Science and Business Media LLC

  • Influences of turning parameters in surface residual stresses in AISI 4340 steel
    Borja Coto, Virginia García Navas, Oscar Gonzalo, Ana Aranzabe, and Carmen Sanz
    Springer Science and Business Media LLC


  • Influence of the coating residual stresses on the tool wear
    O. Gonzalo, O. Gonzalo, V. García Navas, B. Coto, I. Bengoetxea, U. Ruiz de Gopegi, and M. Etxaniz
    Elsevier BV

  • Study of surface integrity of rapid manufacturing parts after different thermal and finishing treatments
    C. Sanz, V. Garcia Navas, O. Gonzalo, and G. Vansteenkiste
    Elsevier BV


  • A method for the identification of the specific force coefficients for mechanistic milling simulation
    Oscar Gonzalo, Jokin Beristain, Haritz Jauregi, and Carmen Sanz
    Elsevier BV

  • Prediction of specific force coefficients from a FEM cutting model
    O. Gonzalo, H. Jauregi, L. G. Uriarte, and L. N. López de Lacalle
    Springer Science and Business Media LLC

  • Surface and mechanical properties of laser melted maraging steel


  • Advances in the ecological machining of magnesium and magnesium-based hybrid parts
    Carmen Sanz, Elena Fuentes, Oscar Gonzalo, Ion Bengoetxea, Franz Obermair, and Markus Eidenhammer
    Inderscience Publishers
    The automotive sector is demanding lighter components being the combination of different materials as an alternative solution to obtain an optimised performance. However, the machining of parts built on magnesium, Magnesium-Aluminium (Mg-Al) or Magnesium-Sintered (Mg-Sint) steel bases is not quite extended, and the technical and safety limitations associated to it are not well-controlled. The machining of two different materials in a single operation demands to reach a compromise between different cooling-lubricant, machinability and machine?tool requirements. This paper shows advances in the machining of a magnesium alloy and magnesium-based hybrid parts under environmentally friendly strategies using dry and Minimum Quantity Lubrication (MQL) conditions.

  • Turning performance optimisation of aeronautical materials by using high pressure cooling technology
    Carmen Sanz, Elena Fuentes, and Oscar Gonzalo
    Inderscience Publishers
    Machining assisted with high pressure cutting fluid is an effective method in turning operations, which allows to overcome the problems presented in the conventional turning of poor machinability materials. These problems arise as consequence of the difficult evacuation from the heat generated during the cutting process, the premature adhesion of the machined material to the cutting tool and the complex removal of the long chips from the cutting zone. The application of cutting fluid with this technique causes a hydraulic pressure between the chip and the rake face of the tool with very positive effect on machining, as chip size and cutting forces reduction and lower tool wear. Advantages of turning assisted with high pressure coolant (140 bars) in comparison to conventional pressure of 2 bars have been shown in roughing and finishing machining tests carried out on three aeronautical materials: Ti6Al4V, Inconel 718 and Steel MSRR6503 EAK.