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Effect of coolant flow rate and depth of cut on grinding temperature using stru...
Costa, S.; Capela, Paulina Araújo; Ribeiro, J.; Pereira, M.; Soares, DelfimEffective control of heat and debris removal during grinding operations are crucial for process optimization. Various approaches are being studied to distribute adequately and efficiently the grinding fluid in the contact zone. This study evaluates an innovative methodology using grinding wheels with an internal network of “cooling channels” designed to deliver the grinding fluid directly from the wheel's core ...
Experimental and CFD simulation analysis of 3D cooling channels to improve the ...
Capela, Paulina Araújo; Costa, S.; Gomes, J. R.; Ribeiro, J.; Pereira, M.; Soares, DelfimEfficient heat and debris removal is essential to optimize the grinding process. A promising approach is the incorporation of three-dimensional channels in the grinding wheel to improve cutting fluid distribution. This study evaluates two types of grooved abrasive discs with spiral and hexagonal geometries, comparing them to a non-structured disc. In addition to experimental tests, Computational Fluid Dynamics ...
Enhancing lubrication efficiency in grinding wheels through internal channels s...
Costa, S.; Capela, Paulina Araújo; Ribeiro, J.; Pereira, M.; Soares, DelfimEffective control of heat and debris removal during grinding operations is critical for process optimization. The distribution of grinding fluids in the contact zone is being studied using different approaches (structured surfaces…). This study proposes an innovative methodology employing grinding wheels with an internal network of cooling channels designed to deliver grinding fluid directly from the wheel's ce...
Wear behavior of a new composite formulation, with TEOS addition, for abrasive ...
Capela, Paulina Araújo; Costa, Sharlane Maria; Souza, M. S.; Carvalho, Sérgio Manuel Freitas; Pereira, Mário; Carvalho, L.; Gomes, J. R.; Soares, DelfimVitrified grinding wheels are used in many manufacturing industries to shape and finish metals and other materials in an efficient way. This work addresses a new approach with the use of tetraethyl orthosilicate solution (TEOS solution or silica sol), as an additive, in vitrified abrasive composites for grinding wheels. Different types of composite were produced using always the same materials and processing me...
Effect of grooves and their geometry on the wear behavior of structured grindin...
Capela, Paulina Araújo; Costa, Sharlane Maria; Souza, M. S.; Carvalho, Sérgio Manuel Freitas; Carvalho, L.; Pereira, M.; Gomes, J. R.; Soares, DelfimThe dry and wet wear behavior of different structured abrasive grinding wheels, with different grooves geometry, were investigated and compared with an unstructured abrasive composite. It was found that the grooves, as well as their geometry, play a decisive role in the wear behavior of abrasive composites.
Dimensional variations on drying of composite components for abrasive wheels
Costa, Sharlane; Capela, Paulina Araújo; Pereira, Mário; Ribeiro, João; Soares, DelfimAbrasive wheels are composed of abrasive grains, vitreous bond precursors and a temporary binder that, normally, includes a liquid part to give consistency and plasticity to the green body [1]. During the drying thermal cycle, there are length variations in the material caused by thermal expansion and water elimination. These can originate the formation of cracks in the composite. In this work, the effect of th...
Effect of distance between grooves on the wear of structured grinding wheels
Costa, Sharlane Maria; Capela, Paulina Araújo; Souza, Maria Sabrina Veira Miranda Palva; Carvalho, Sérgio Manuel Freitas; Pereira, Mário; Carvalho L.During roughing and surface finishing operations a lot of heat is generated in the grinding wheel/workpiece contact zone. The surface structuring/texturing of abrasive wheels has been a proposal to reduce the operating temperature. In this work, three spiral grooved abrasive discs were produced, with different distances between grooves. The wear behavior of structured grinding wheels was evaluated by lubricated...
Effect of sintering temperature on mechanical and wear behaviour of a ceramic c...
Capela, Paulina Araújo; Carvalho, S. F.; Guedes, A.; Pereira, Mário; Carvalho, Luís; Correia, Junior; Soares, Delfim; Gomes, J. R.© 2017 Elsevier Ltd A new vitrified bonded abrasive composite for grinding wheels and a reference material used in the industrial production of grinding wheels were compared in terms of mechanical properties and wear behaviour. The new formulation abrasive samples were processed using different sintering temperatures. With the new composite, it was possible to, simultaneously, obtain similar mechanical properti...
Influence of the microstructure on the creep behaviour of Tin-Silver-Copper solder
Ribeiro, Pedro Emanuel Abreu; Soares, Delfim; Cerqueira, M. F.; Teixeira, S. F. C. F.; Barros, Daniel Araújo; Teixeira, J. CarlosA common failure mode of electronic printed circuit boards (PCB’s) is the appearance of cold solder joints between the component and PCB, during product life. This phenomenon is related to solder joint fatigue and is attributed mainly to the mismatch of the coefficients of thermal expansion (CTE) of component-solder-PCB assembly. With today’s solder joint thickness decreasing and increasing working temperatures...
Influence of Copper layer content in the elastic and damping behavior of Glass-...
Carneiro, Vítor Hugo Pimenta; Capela, Paulina Araújo; Teixeira, J. Carlos; Teixeira, S. F. C. F.; Cerqueira, M. F.; Macedo, Francisco; Ribas, L.The impact in the elastic behavior and internal friction, caused by the introduction of Copper layers in Glass-Fiber/Epoxy Resin composites and temperature effects, were studied and evaluated recurring to Dynamic Mechanical Analysis. It is shown that the introduction of Copper layers increases the storage modulus of the composites and delays their glass transition temperature, however, it allows a faster transf...