IDEKO IK4

Elgoibar, Spain

IDEKO IK4

Elgoibar, Spain

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Garitaonandia I.,University of the Basque Country | Albizuri J.,University of the Basque Country | Fernandes M.H.,University of the Basque Country | Hernandez J.M.,University of the Basque Country | And 2 more authors.
International Journal of Mechatronics and Manufacturing Systems | Year: 2011

The appearance of vibrations during centreless grinding process is one of the main factors limiting the current requirements of precision and productivity. This paper presents a novel procedure for the design of an active vibration reduction system in a centreless grinding machine using piezoelectric actuators. The different phases involved in the modelling procedure of the machine tool are explained, together with the followed approach to locate the actuators. Taking as reference the finite element model of the machine, the most important mode shapes affecting the chatter behaviour have been considered to obtain a low order state space model. This reduced model has been used to simulate the effectiveness of the control strategy and the results have been compared with those obtained experimentally after the system implementation. A good agreement has been obtained demonstrating that the modelling procedure followed is useful to predict the effectiveness of control systems. Copyright © 2011 Inderscience Enterprises Ltd.


Barrenetxea D.,Ideko IK4 | Marquinez J.I.,Ideko IK4 | Alvarez J.,Ideko IK4 | Fernandez R.,University of Mondragon | And 3 more authors.
Machining Science and Technology | Year: 2012

Recent advances in process modeling allow for more accurate prediction of complex phenomena. A combination of different modeling approaches makes it possible to develop new products to set up, control and optimize machining operations. In the near future, a continuous improvement strategy should be adopted, as improvements to advanced models open up new opportunities for industrial applications. In particular, the efforts made by different research groups on grinding have given rise to significant developments in this area, some of which have recently been made into applied software. As an example of the necessity for process modeling and the viability of industrialized tools based on it, this article presents the work carried out on the development of an assistant tool for the setting up and optimization of the centerless grinding process, focusing on avoiding the main limitations of this process and optimizing productivity. © 2012 Copyright Taylor and Francis Group, LLC.


Garitaonandia I.,University of the Basque Country | Albizuri J.,University of the Basque Country | Hernandez-Vazquez J.M.,University of the Basque Country | Fernandes M.H.,University of the Basque Country | And 2 more authors.
Precision Engineering | Year: 2013

In this paper a novel methodology is presented to optimize an active chatter control system based on piezoelectric actuators in a centerless grinding machine. With the proposed modeling procedure, a compact and efficient control system is obtained, perfectly adapted to the specific characteristics of the machine. First, the previous theoretical and experimental works done in the centerless grinding machine under study are presented briefly, with emphasis on the development of a validated finite element (FE) model capable of predicting the behavior of the machine controlled actively. Afterwards, making use of this FE model, a theoretical procedure is developed to optimize the control system. Concretely, the piezoelectric actuators are redesigned to achieve a solution oriented to the specific characteristics of the machine and the control algorithm is adapted to the new design, leading to a highly integrated mechatronic solution. The new active control scheme is simulated using a reduced order state space model, verifying the effectiveness of the proposed solution. Finally, in line with the new design, a prototype is manufactured and integrated in the machine, and the experimental results obtained from different operating conditions are shown. The study of the theoretical and experimental results makes it possible to verify the improvements in the chatter stability of the process once the control system has been applied, as well as to confirm the theoretically predicted performance. This way, the work carried out in this paper shows the satisfactory use of a validated FE model to deal with the optimization process of an active vibration control system. © 2013 Elsevier Inc.


Barrenetxea D.,Ideko IK4 | Alvarez J.,Ideko IK4 | Monedero A.,Ideko IK4 | Madariaga J.,Tekniker IK4 | Akorta A.,GOIMEK S. Coop
CIRP Annals - Manufacturing Technology | Year: 2013

Achieving and maintaining geometrical accuracy is nowadays the main limiting factor to accomplish an efficient manufacturing process in the surface grinding of big components. The present paper shows a deep research work carried out by means of experimental measurements of shape deviations, infrared pictures of the temperature field distributions and corresponding FEM simulations that confirm the thermal origin as one of the main limiting factors. A deeper investigation about the influence of the environment and cooling conditions, constraints imposed by part clamping and the grinding conditions reveals that the compensation and even control of thermal effects is possible by combining IR monitoring, modeling and simulation, although still being a challenging methodology. © 2013 CIRP.


PubMed | Hospital General Universitario Gregorio Maranon, CIC Biomagune, Hospital Universitario Of Salamanca Ibsal, Hospital Virgen Of La Salud and 2 more.
Type: | Journal: Scientific reports | Year: 2016

Aortic stenosis (AS) is the most common form of valve disease. Once symptoms develop, there is an inexorable deterioration with a poor prognosis; currently there are no therapies capable of modifying disease progression, and aortic valve replacement is the only available treatment. Our goal is to study the progression of calcification by matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI-IMS) and get new insights at molecular level that could help in the understanding of this disease. In this work, we analyzed consecutive slices from aortic valve tissue by MALDI-IMS, to establish the spatial distribution of proteins and peptides directly from the surface of the histological sections. The analysis showed different structures corresponding to regions observed in conventional histology, including large calcification areas and zones rich in collagen and elastic fibers. Peptide extraction from the tissue, followed by liquid chromatography mass spectrometry analysis, provided the identification of collagen VI -3 and NDRG2 proteins which correlated with the masses obtained by MALDI-IMS and were confirmed by immunohistochemistry. These results highlighted the molecular mechanism implied in AS using MALDI-IMS, a novel technique never used before in this pathology. In addition, we can define specific regions proving a complementary resolution of the molecular histology.


Iloro I.,CIC Biomagune | Bueno A.,IDEKO IK4 | Calvo J.,CIC Biomagune | Urreta H.,IDEKO IK4 | Elortza F.,CIC Biomagune
Journal of Laboratory Automation | Year: 2016

Matrix-assisted laser desorption/ionization (MALDI) imaging mass spectrometry (IMS) is a powerful tool for investigating the distribution of proteins and other molecules within biological systems through the in situ analysis of tissue sections, enabling molecular histology. MALDI IMS can determine the distribution of hundreds of unknown compounds in a single measurement while maintaining spatial and molecular integrity. The matrix spraying stage is a key factor in making this technique more sensitive and robust. In this article, we describe a custom-made matrix sprayer (Langartech), which is both inexpensive (estimated cost of about €3000, or $3500) and reliable compared with the alternatives present in the market today, with prices greater than €20,000 ($25,000). Several comparisons were made between our Langartech sprayer and one of the high-end matrix sprayers commercially available: ImagePrep (Bruker Daltonics). Focusing on lateral resolution and observed peak intensities, overall results show that our sprayer behaves in a very competitive fashion, especially when taking into account the huge difference in sophistication level and price. © 2015, 2015 Society for Laboratory Automation and Screening.


Barrenetxea D.,Ideko IK4 | Alvarez J.,Ideko IK4 | Madariaga J.,Tekniker IK4 | Gallego I.,University of Mondragon
CIRP Annals - Manufacturing Technology | Year: 2011

Multiple diameter part applications cope a relevant percentage of infeed centerless grinding operations. Nevertheless, general stability analysis and process optimisation has been mainly investigated for mono-diameter parts. This paper presents a time domain simulation software developed for multiple diameter parts that allows the simulation of average and particular evolution of process forces, power, machine deflections, thermal behaviour, real part diameter and roughness. First, a work rotation stability analysis is carried out. Then, with the use of both the stability analysis and the infeed cycle simulation, optimized process parameters and cycles are defined in order to increase process productivity. © 2011 CIRP.


Bediaga I.,Ideko IK4 | Zatarain M.,Ideko IK4 | Munoa J.,Ideko IK4 | Lizarralde R.,Ideko IK4
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | Year: 2011

This paper investigates the effectiveness of the continuous spindle speed variation (CSSV) technique as a chatter-suppression strategy in the milling process. For this purpose, a two-fold study was carried out: on the one hand, a simulation analysis, and on the other, experimental tests. First, the semidiscretization method has been extended to n-mode systems in any spatial direction and modified to include simulation capabilities concerning spindle speed variation with different waveforms. A new kind of stability map for different amplitude and frequency variations is proposed in order to optimize the parameter selection when machining. Finally, the effectiveness of the CSSV technique is verified through experimental tests.


Mujika A.,Vicomtech IK4 | Oyarzun D.,Vicomtech IK4 | Iparragirre I.,Vicomtech IK4 | Dominguez J.,IDEKO IK4
ICETA 2011 - 9th IEEE International Conference on Emerging eLearning Technologies and Applications, Proceedings | Year: 2011

In this paper, we present the project MACHS, a platform for the generation of serious games, i.e. courses in 3D environments for machine-tool training. The platform consists of two applications: an easy-to-use authoring tool for editing the courses and a 3D simulator for running them. In this paper, we describe the features and the functionalities of each part of the platform. We also describe the structure of the XML files designed for the storage of the information about courses, machines, cameras, interaction, etc. and how we use them to link the editor and the simulator. © 2011 IEEE.


PubMed | CIC Biomagune and IDEKO IK4
Type: Comparative Study | Journal: Journal of laboratory automation | Year: 2016

Matrix-assisted laser desorption/ionization (MALDI) imaging mass spectrometry (IMS) is a powerful tool for investigating the distribution of proteins and other molecules within biological systems through the in situ analysis of tissue sections, enabling molecular histology. MALDI IMS can determine the distribution of hundreds of unknown compounds in a single measurement while maintaining spatial and molecular integrity. The matrix spraying stage is a key factor in making this technique more sensitive and robust. In this article, we describe a custom-made matrix sprayer (Langartech), which is both inexpensive (estimated cost of about 3000, or $3500) and reliable compared with the alternatives present in the market today, with prices greater than 20,000 ($25,000). Several comparisons were made between our Langartech sprayer and one of the high-end matrix sprayers commercially available: ImagePrep (Bruker Daltonics). Focusing on lateral resolution and observed peak intensities, overall results show that our sprayer behaves in a very competitive fashion, especially when taking into account the huge difference in sophistication level and price.

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