10 documents found, page 1 of 1
CFD analysis of multi-layer cooling channels in three-dimensionally structured ...
Costa, Sharlane; Capela, Paulina; Hassui, Amauri; Ribeiro, J.E.; Pereira, Mário; Soares, DelfimMinimizing heat damage and surface integrity loss in grinding depends on effective cooling. Conventional techniques, however, suffer with low efficiency because of the fast air barrier restricting fluid access. Grinding wheels with internal cooling channels have been suggested to solve this; nonetheless, the impact of channel geometry and multi-layer topologies is yet unknown. This work investigates their effec...
Performance of 3D-structured grinding wheels with multi-layer internal cooling ...
Costa, Sharlane; Capela, Paulina; Hassui, Amauri; Ribeiro, J.E.; Pereira, Mário; Soares, DelfimGrinding is a key machining process in industries that demand high precision and surface quality. However, the conventional flood cooling method is often ineffective due to the air barrier formed by the rotating wheel, which restricts fluid access to the contact zone. This causes thermal instability, high coolant use, and environmental impact. To overcome these limitations, this study investigates alumina grind...
A New Grinding Wheel Design with a 3D Internal Cooling Structure System
Costa, Sharlane; Capela, Paulina; Souza, Maria S.; Gomes, José R.; Carvalho, Luís; Pereira, Mário J.; Soares, DelfimThis work discusses challenges in conventional grinding wheels: heat-induced tool wear and workpiece thermal damage. While textured abrasive wheels improve heat dissipation, the current surface-only methods, such as those based on laser and machining, have high renewal costs. The proposed manufacturing technology introduces an innovative 3D cooling channel structure throughout the wheel, enabling various channe...
Solidification and heat-treatment conditions affecting the tensile properties a...
Barbosa, Carolina; Azevedo, Hugo; Costa, Sharlane; Ribeiro, J.E.; Carlos, José; Costa, Tiago; Rocha, OtavioIn this work, a study on the interrelationship between the solidification and heat-treatment processes parameters with tensile properties and fracture feature was performed with an automotive AlSiMg alloy. For that, samples of the horizontally solidified Al7Si0.3 Mg (wt.%) alloy were subjected to the T6-heat treatment, and tensile tests were performed on both investigated samples, under conditions established f...
Texturing methods of abrasive grinding wheels: a systematic review
Costa, Sharlane; Pereira, Mário J.; Ribeiro, J.E.; Soares, DelfimCreating textures on abrasive wheels is a strategy that allows a significant improvement in grinding operations. The reduction of the internal stresses in the workpiece and the temperature during the grinding operation generates an increase in the dimensional accuracy of the workpiece and a longer tool life. Textured abrasive wheels can be produced in many different ways. Depending on the processing method, the...
Control of the dimensional variation adjusting the thermal drying cycle of abra...
Costa, Sharlane; Marques, F.D.P.; Pereira, Mário J.; Ribeiro, J.E.; Soares, DelfimIn composite production, during the thermal drying cycle (T<100ºC), size variation of the composite material occurs due to thermal expansion and water elimination. However, when incorporating PLA components, produced by additive manufacturing, into the abrasive composite, the dimensional variation of the set is very large due to the higher polymer thermal expansion. During this stage, this composite, still in t...
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...
Experimental and numerical study to minimize the residual stresses in welding o...
Costa, Sharlane; Souza, Maria Sabrina; Braz-César, Manuel; Gonçalves, José; Ribeiro, J.E.One of the most important negative consequence in the fusion welding processes is the generation of tensile residual stresses in welded joints. The main goals of this work are to determine the optimal combination of welding parameters to minimize the residual stress level and the influence of each welding parameter in that feature to weld 6082-T6 aluminum alloy plates using the GMAW welding process. To achieve ...
Micrographic study of weded joints in aluminium allows by mig process
Costa, Sharlane; Ribeiro, J.E.; Gonçalves, José; Medeiros, Bruno B.; Izeda, António Eduardo CruzThe objective of this work is to analyze and evaluate the influence of thermal treatments of solubilization, tempering and aging sequence, made in the 6082 - T6 alloy, previously welded by the MIG (Metal Inert Gas) welding process. In this work, a microscopically analysis of the welded and a thermally treated joint is realized, to evaluate the microstructure quality and the results found by varying the time and...
Estudo da qualidade micrográfica de juntas soldadas em ligas de alumínio pelo p...
Costa, SharlaneO objetivo desta dissertação de mestrado é o estudo da qualidade micrográfica de juntas soldadas em ligas de alumínio pelo processo MIG robotizado. O ciclo de tratamentos realizados foi constituído por solubilização, têmpera e envelhecimento artificial. Também foi definido um intervalo de espera entre os dois últimos tratamentos afim de avaliar o efeito de um possível envelhecimento natural. Para definição do q...