Einar Martin-Macho

@ehu.eus

Department of Mechanical Engineering, Bilbao School of Engineering
University of the Basque Country (UPV/EHU)

Einar Martin-Macho


                     Download Compact PDF  
https://researchid.co/einarmartin-macho

RESEARCH, TEACHING, or OTHER INTERESTS

Industrial and Manufacturing Engineering, Mechanical Engineering, Mechanics of Materials, Materials Science
2

Scopus Publications

14

Scholar Citations

2

Scholar h-index

1

Scholar i10-index

Scopus Publications

  • Accurate Measurement of Temperatures in Industrial Grinding Operations with Steep Gradients
    Iñigo Pombo, José Antonio Sánchez, Einar Martin, Leire Godino, Jorge Álvarez
    Sensors, 2024
    Due to the continuously growing demands from high-added-value sectors such as aerospace, e-mobility or biomedical bound-abrasive technologies are the key to achieving extreme requirements. During grinding, energy is rapidly dissipated as heat, generating thermal fields on the ground part which are characterized by high temperatures and very steep gradients. The consequences on the ground part are broadly known as grinding burn. Therefore, the measurement of workpiece temperature during grinding has become a critical issue. Many techniques have been used for temperature measurement in grinding, amongst which, the so-called grindable thermocouples exhibit great potential and have been successfully used in creep-feed grinding operations, in which table speed is low, and therefore, temperature gradients are not very steep. However, in conventional grinding operations with faster table speeds, as most industrial operations are, the delay in the response of the thermocouple results in large errors in the maximum measured value. In this paper, the need for accurate calibration of the response of grindable thermocouples is studied as a prior step for signal integration to correct thermal inertia. The results show that, if the raw signal is directly used from the thermocouples, the deviation in the maximum temperature with respect to the theoretical model is over 200 K. After integration using the calibration constants obtained for the ground junction, the error can be reduced to 93 K even for feed speeds as high as 40 m/min and below 20 K for lower feed speeds. The main conclusion is that, following the proposed procedure, maximum grinding temperatures can be effectively measured using grindable thermocouples even at high values of table speed.
  • Analyzing the influence of dressing parameters on the real depth of cut during rotary dressing of vitrified bonded cbn grinding wheels
    Einar Martin, Leire Godino, Jorge Álvarez, José Antonio Sánchez
    Advances in Science and Technology, 2023
    Grinding is a widely used process in many industries due to the precise geometric tolerances and excellent surface finishes it can offer, which makes it very useful when high quality parts have to be manufactured. Due to the wear that the grinding wheel suffers, a process known as dressing is periodically carried out to recover the cutting ability of the wheel. Dressing is an extremely important part of the grinding process, as it can alter and improve the cutting conditions of the wheel.During the dressing of vitrified bonded CBN wheels, the real dressing depth of cut is significantly lower than the theoretical depth of cut, leading to dimensional errors in the dressed grinding wheel, which consequently translate into the ground part. However, while deformations during grinding have been widely studied, this phenomenon has not been yet analyzed during dressing. Therefore, the main objective of this work is to determine the influence of the dressing parameters on the real depth of cut. Also, the effect of dresser wear and the deformations has been determined separately.To this end, a new methodology has been developed to measure the real depth of cut using a laser displacement sensor. Moreover, experimental tests have been carried out to characterize the influence that the dressing speed ratio (qd) and set depth of cut (ad_set) have on the actual depth of cut (ad_real). It has been seen that the use of negative qd results in a more accurate real depth of cut, and therefore a more efficient dressing process. While the error using negative qd is about 10 %, using positive qd is about 25 %.

RECENT SCHOLAR PUBLICATIONS

  • Achieving effective material removal in abrasive fine-finishing with polymer-bonded elastic wheels
    E Martin-Macho, L Godino, JA Sánchez, I Pombo
    Materials and Manufacturing Processes, 1-10 , 2026
    2026
  • Caracterización mecánica de muelas de rectificado elásticas con aglomerante de caucho mediante ensayos de flexión
    EM Macho, LG Fernandez, EC Fernandez, JAS Galíndez, IP Rodilla
    DYNA 99 (5), 470-474 , 2024
    2024
  • Influence of the grinding process on API 5L X70 HSLA steel using rubber bonded elastic wheels and characterization or their mechanical properties
    E Martín Macho
    2024
  • Accurate measurement of temperatures in industrial grinding operations with steep gradients
    I Pombo, JA Sánchez, E Martin, L Godino, J Álvarez
    Sensors 24 (6), 1741 , 2024
    2024
    Citations: 11
  • Analyzing the influence of dressing parameters on the real depth of cut during rotary dressing of vitrified bonded CBN grinding wheels
    E Martin, L Godino, J Álvarez, JA Sánchez
    Advances in Science and Technology 132, 61-69 , 2023
    2023
    Citations: 3

MOST CITED SCHOLAR PUBLICATIONS

  • Accurate measurement of temperatures in industrial grinding operations with steep gradients
    I Pombo, JA Sánchez, E Martin, L Godino, J Álvarez
    Sensors 24 (6), 1741 , 2024
    2024
    Citations: 11
  • Analyzing the influence of dressing parameters on the real depth of cut during rotary dressing of vitrified bonded CBN grinding wheels
    E Martin, L Godino, J Álvarez, JA Sánchez
    Advances in Science and Technology 132, 61-69 , 2023
    2023
    Citations: 3
  • Achieving effective material removal in abrasive fine-finishing with polymer-bonded elastic wheels
    E Martin-Macho, L Godino, JA Sánchez, I Pombo
    Materials and Manufacturing Processes, 1-10 , 2026
    2026
  • Caracterización mecánica de muelas de rectificado elásticas con aglomerante de caucho mediante ensayos de flexión
    EM Macho, LG Fernandez, EC Fernandez, JAS Galíndez, IP Rodilla
    DYNA 99 (5), 470-474 , 2024
    2024
  • Influence of the grinding process on API 5L X70 HSLA steel using rubber bonded elastic wheels and characterization or their mechanical properties
    E Martín Macho
    2024