15 documents found, page 1 of 2
Study on the Micro-Abrasion Wear Behavior of PVD Hard Coating under Different S...
Baptista, Andresa; Pinto, Gustavo F.; Sousa, Vitor F. C.; Silva, Francisco J. G.; Fernandes, FilipeMicroscale abrasion has been intensively used to study the wear behavior o several hard coatings, enabling the observation of different wear mechanisms. Recently, a study arguing whether the surface texture of the ball could influence the dynamics of abrasive particles throughout the contact was presented. In this work, the influence of the abrasive particles concentration able to change the texture of the ball...
Study on the Wear Modes of PVD Films Using Different Concentrations of Al2O3 Ab...
Pinto, Gustavo Filipe; Baptista, Andresa; Sousa, Vitor F. C.; Silva, Francisco J. G.; Evaristo, Manuel; Fernandes, FilipeAbrasive wear is a wear mechanism that results in a loss of material from the interaction of a surface with hard particles. This type of wear is frequently found in the surface of machining tools. Microscale abrasion equipment is often used to characterize the resistance to abrasive wear of a surface. The different parameters able to control micro-abrasion wear tests, such as ball rotation, sliding distance bet...
Wear Behavior Phenomena of TiN/TiAlN HiPIMS PVD-Coated Tools on Milling Inconel...
Sousa, Vitor F. C.; Fernandes, Filipe; Silva, Francisco J. G.; Costa, Rúben D. F. S.; Sebbe, Naiara; Sales-Contini, Rita C. M.Due to Inconel 718’s high mechanical properties, even at higher temperatures, tendency to work-harden, and low thermal conductivity, this alloy is considered hard to machine. The machining of this alloy causes high amounts of tool wear, leading to its premature failure. There seems to be a gap in the literature, particularly regarding milling and finishing operations applied to Inconel 718 parts. In the present...
A New Concept of Jig Rotary Holder System for 3-Axis CNC Milling Machine Operat...
Silva, Francisco J. G.; Campilho, R.D.S.G.; Sousa, Vitor F. C.; Coelho, Luis F. P.; Pinto Ferreira, Luís; Pereira, Maria Teresa; Matos, J.This study aims to develop a new jig holding system that is able to be controlled by a Computer Numeric Control (CNC) installed on three-axis machining centers, which can drastically improve the productivity in machining operations, enabling the machining of unparallel plans in the same setup. An action research methodology was adopted for this work, which, through a practical approach, intends to generate tran...
Build-Up an Economical Tool for Machining Operations Cost Estimation
Silva, Francisco J. G.; Sousa, Vitor F. C.; Pinto, Arnaldo; Pinto Ferreira, Luís; Pereira, Maria TeresaCurrently, there is a lack of affordable and simple tools for the estimation of these costs, especially for machining operations. This is particularly true for manufacturing SMEs, in which the cost estimation of machined parts is usually performed based only on required material for part production, or involves a time-consuming, non-standardized technical analysis. Therefore, a cost estimation tool was develope...
Experimental study on the wear evolution of different PVD coated tools under mi...
Sousa, Vitor F. C.; Silva, Francisco J. G.; Alexandre, Ricardo; Fecheira, José S.; Pinto, Gustavo Filipe; Baptista, AndresaDuplex stainless steels are being used on applications that require, especially, high corrosion resistance and overall good mechanical properties, such as the naval and oil-gas exploration industry. The components employed in these industries are usually obtained by machining, however, these alloys have low machinability when compared to conventional stainless steels. In this work, a study of the wear developed...
Hybrid Manufacturing Processes Used in the Production of Complex Parts: A Compr...
Sebbe, Naiara P. V.; Fernandes, Filipe; Sousa, Vitor F. C.; Silva, Francisco J. G.Additive manufacturing is defined as a process based on the superposition of layers of materials in order to obtain 3D parts; however, the process does not allow achieve the adequate and necessary surface finishing. In addition, with the development of new materials with superior properties, some of them acquire high hardness and strength, consequently decreasing their ability to be machined. To overcome this s...
Using an Artificial Neural Network Approach to Predict Machining Time
Rodrigues, André; Silva, Francisco; Sousa, Vitor F. C.; Pinto, Arnaldo; Pinto Ferreira, Luís; Pereira, Maria Teresa RibeiroOne of the most critical factors in producing plastic injection molds is the cost estimation of machining services, which significantly affects the final mold price. These services’ costs are determined according to the machining time, which is usually a long and expensive operation. If it is considered that the injection mold parts are all different, it can be understood that the correct and quick estimation o...
A Novel Robotic Manipulator Concept for Managing the Winding and Extraction of ...
Costa, Rúben; Sousa, Vitor F. C.; Silva, Francisco J. G.; Campilho, Raul; Pinto, Arnaldo; Pinto Ferreira, Luís; Soares, RuiWire rope manufacturing is an old industry that maintains its place in the market due to the need for products with specific characteristics in different sectors. The necessity for modernization and performance improvement in this industry, where there is still a high amount of labor dedicated to internal logistics operations, led to the development of a new technology method, to overcome uncertainties related ...
Automating Equipment towards Industry 4.0: A New Concept for a Transfer System ...
Vieira, Diogo; Silva, Francisco J. G.; Campilho, R.D.S.G.; Sousa, Vitor F. C.; Pinto Ferreira, Luís; Sá, José Carlos; Brito, MarleneSeveral products with a high length/section ratio and with a relatively low stiffness are used in the automotive industry, causing several problems because of a lack of stiffness. One of the examples where this occurs is in the production of Bowden cables, where automation has played a very important role in the flexibility of processes and product quality. Within this product family, conduits, one of the compo...