Threading Performance of Different Coatings for High Speed Steel Tapping

Threading holes using tapping tools is a widely used machining operation in the industry. This manufacturing process involves a great tool immersion in the part, which involves both friction and cutting. This makes the use of coatings critical to improving tool life. Four coatings are used based on Physical vapor deposition (PVD) technology—TiN, TiCN, TiAlN and TiAlN+WC/C are compared to uncoated tool performance. The effect of various coatings on the life ofM12 _ 1.5 tapping tools during threading of through holes 20 mm deep, in GG25 casting plates, dry and applying cutting speed of 50 m/min. The end-of-life criterion has been established based on a cutting torque of 16 N-m. Taking the uncoated tap as a basis for comparison, it is observed that coatings based on PVD technologies increase tool life doubling in the most advantageous case with the TiAlN coating. PVD type coatings provide better protection towear at cylindrical area of the tool, where the thread profile is finished, than uncoated taps. The teeth located in the cone-cylinder transition zone of the taps suffer the most wear regardless of the coating. However, taps coated with TiAlN+WC/C wear level values is lowest of all the coatings tested, which indicates a strong reinforcement in these teeth.This research was funded by the vice-counseling of technology, innovation and competitiveness of the Basque Government grant agreements IT-2005/00201, ZL-2019/00720 (HARDCRAFT project) and KK-2019/00004 (PROCODA project)

Actively lubricated hybrid journal bearings based on magnetic fluids for high-precision spindles of machine tools

International audienceThe research work reported in this paper is focused on the use of magnetic fluids as active lubricant for improving the performance of hybrid journal bearings, with application to high precision machine tools. Prototype design was optimized following numerical computation of Reynolds equation and computational fluid dynamics (CFD) calculations, in both cases with Herschel-Buckley model for the magnetorheological fluid. This fluid (LORD Corp. MRF 122-2ED) was experimentally characterized in detail. The improvement of the hydrodynamic effect in journal bearings was demonstrated with 50% higher load capacity and stiffness, mainly at half of shaft eccentricity 0.4<ε<0.7. Active hydrostatic lubrication achieved quasi-infinite stiffnes

Project Success Criteria Evaluation for a Project-Based Organization and Its Stakeholders&mdash;A Q-Methodology Approach

The criteria that define project success change from one project to another, also from organization to organization, making success contextual for both the project organization and its stakeholders. This paper proposes a way to bridge this gap between what project success means to an organization and to its stakeholders in the context of Research and Development (R&amp;D) projects. To achieve this, the available literature on project success has been analyzed to convert the different aspects identified into tangible units, allowing us to define and analyze the success criteria of a project in different dimensions. Subsequently, using Q-Methodology, which allowed us to determine among subjective opinions of Project Managers (PMs) of a project-based organization and their internal stakeholders, we will determine which criteria, within the previously identified dimensions, they consider as the most important for the success of a project, aiming to identify common success criteria that can be measured and controlled in the projects. Achieving the project goal, customer satisfaction regarding the quality of the activities, and knowledge generation turned out to be the most important criteria for PMs and stakeholders

Project Success Criteria Evaluation for a Project-Based Organization and Its Stakeholders—A Q-Methodology Approach

The criteria that define project success change from one project to another, also from organization to organization, making success contextual for both the project organization and its stakeholders. This paper proposes a way to bridge this gap between what project success means to an organization and to its stakeholders in the context of Research and Development (R&D) projects. To achieve this, the available literature on project success has been analyzed to convert the different aspects identified into tangible units, allowing us to define and analyze the success criteria of a project in different dimensions. Subsequently, using Q-Methodology, which allowed us to determine among subjective opinions of Project Managers (PMs) of a project-based organization and their internal stakeholders, we will determine which criteria, within the previously identified dimensions, they consider as the most important for the success of a project, aiming to identify common success criteria that can be measured and controlled in the projects. Achieving the project goal, customer satisfaction regarding the quality of the activities, and knowledge generation turned out to be the most important criteria for PMs and stakeholders

Assessing Industrial Communication Protocols to Bridge the Gap between Machine Tools and Software Monitoring

Industrial communication protocols are protocols used to interconnect systems, interfaces, and machines in industrial environments. With the advent of hyper-connected factories, the role of these protocols is gaining relevance, as they enable the real-time acquisition of machine monitoring data, which can fuel real-time data analysis platforms that conduct tasks such as predictive maintenance. However, the effectiveness of these protocols is largely unknown and there is a lack of empirical evaluation which compares their performance. In this work, we evaluate OPC-UA, Modbus, and Ethernet/IP with three machine tools to assess their performance and their complexity of use from a software perspective. Our results show that Modbus provides the best latency figures and communication has different complexities depending on the used protocol, from the software perspective

Evaluation on advantages of low frequency assisted drilling (LFAD) aluminium alloy Al7075

Publisher Copyright: Copyright © 2020 Inderscience Enterprises Ltd.Drilling operation of dissimilar stack materials is a crucial assembly operation in airframe manufacturing; this is due to both the number of holes drilled in an aircraft structure and the fact that this is an operation performed in the finishing phase of the manufacturing chain. This paper aims to evaluate an alternative strategy for conventional drilling and peck drilling, which are now the most widespread solutions used for drilling aluminium alloys. The alternative approach proposed by this paper consists of low frequency assisted drilling (LFAD) performed into frequencies vibrations (between 50 to 100 Hz). In this paper, the chip formation process of drilling assisted by low-frequency vibrations of FC/Al stack material has been analytically modelled and compared with the conventional drilling of aluminium. Results show chip segmentation during the drilling operation resulting in less temperature increasing, avoiding problems in the final geometrical quality of the hole, and burr formation.This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 723698. This paper reflects only the author’s views and the Commission is not responsible for any use that may be made of the information contained therein. This research was funded by the vice-counselling of technology, innovation and competitiveness of the Basque Government grant agreements IT-2005/00201, ZL-2019/00720 (HARDCRAFT project) and KK-2019/00004 (PROCODA project). This research was funded by the vice-counselling of technology, innovation and competitiveness of the Basque Government grant agreements IT-2005/00201, ZL-2019/00720 (HARDCRAFT project) and KK-2019/00004 (PROCODA project). This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 723698. This paper reflects only the author's views and the Commission is not responsible for any use that may be made of the information contained therein.Peer reviewe