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Matthew S Dargusch - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic compressed air on the evolution of cutting force and tool wear during machining of ti 6al 4v alloy
Journal of Materials Processing Technology, 2015Co-Authors: Shoujin Sun, Milan Brandt, S Palanisamy, Matthew S DarguschAbstract:Abstract The effect of cryogenic compressed air cooling on tool wear and cutting forces during cutting Ti–6Al–4V alloy has been investigated at two cutting speeds at which cutting tool fails as the result of gradual flank wear and catastrophic plastic deformation of the cutting edge, respectively, during dry machining. It is found that the application of cryogenic compressed air dramatically increased tool life compared with dry machining, and the increase in tool life was more significant at higher cutting speed as the plastic deformation of cutting edge that occurred during dry machining was suppressed during machining with cryogenic compressed air cooling. The improvement of tool life with application of cryogenic compressed air cooling during machining is attributed to the low temperature and high pressure of cryogenic air jet, which leads to the reduction in cutting temperature due to the enhanced cooling and reduction in tool-chip contact length. Low cutting temperature results in reducing wear rate, size of chip built-up edge and maintaining the strength of the cutting edge in order to resist plastic deformation.
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machining ti 6al 4v alloy with cryogenic compressed air cooling
International Journal of Machine Tools & Manufacture, 2010Co-Authors: Shoujin Sun, Milan Brandt, Matthew S DarguschAbstract:A new cooling approach with cryogenic compressed air has been developed in order to cool the cutting tool edge during turning of Ti–6Al–4V alloy. The cutting forces, chip morphology and chip temperature were measured and compared with those measured during machining with compressed air cooling and dry cutting conditions. The chip temperature is lower with cryogenic compressed air cooling than those with compressed air cooling and dry machining. The combined effects of reduced friction and chip bending away from the cutting zone as a result of the high-speed air produce a thinner chip with cryogenic compressed air cooling and a thicker chip with compressed air cooling compared to dry machining alone. The marginally higher cutting force associated with the application of cryogenic compressed air compared with dry machining is the result of lower chip temperatures and a higher shear plane angle. The tendency to form a segmented chip is higher when machining with cryogenic compressed air than that with compressed air and dry machining only within the ranges of cutting speed and feed when chip transitions from continuous to the segmented. The effect of cryogenic compressed air on the cutting force and chip formation diminishes with increase in cutting speed and feed rate. The application of both compressed air and cryogenic compressed air reduced flank wear and the tendency to form the chip built-up edge. This resulted in a smaller increase in cutting forces (more significantly in the feed force) after cutting long distance compared with that observed in dry machining.
Shoujin Sun - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic compressed air on the evolution of cutting force and tool wear during machining of ti 6al 4v alloy
Journal of Materials Processing Technology, 2015Co-Authors: Shoujin Sun, Milan Brandt, S Palanisamy, Matthew S DarguschAbstract:Abstract The effect of cryogenic compressed air cooling on tool wear and cutting forces during cutting Ti–6Al–4V alloy has been investigated at two cutting speeds at which cutting tool fails as the result of gradual flank wear and catastrophic plastic deformation of the cutting edge, respectively, during dry machining. It is found that the application of cryogenic compressed air dramatically increased tool life compared with dry machining, and the increase in tool life was more significant at higher cutting speed as the plastic deformation of cutting edge that occurred during dry machining was suppressed during machining with cryogenic compressed air cooling. The improvement of tool life with application of cryogenic compressed air cooling during machining is attributed to the low temperature and high pressure of cryogenic air jet, which leads to the reduction in cutting temperature due to the enhanced cooling and reduction in tool-chip contact length. Low cutting temperature results in reducing wear rate, size of chip built-up edge and maintaining the strength of the cutting edge in order to resist plastic deformation.
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machining ti 6al 4v alloy with cryogenic compressed air cooling
International Journal of Machine Tools & Manufacture, 2010Co-Authors: Shoujin Sun, Milan Brandt, Matthew S DarguschAbstract:A new cooling approach with cryogenic compressed air has been developed in order to cool the cutting tool edge during turning of Ti–6Al–4V alloy. The cutting forces, chip morphology and chip temperature were measured and compared with those measured during machining with compressed air cooling and dry cutting conditions. The chip temperature is lower with cryogenic compressed air cooling than those with compressed air cooling and dry machining. The combined effects of reduced friction and chip bending away from the cutting zone as a result of the high-speed air produce a thinner chip with cryogenic compressed air cooling and a thicker chip with compressed air cooling compared to dry machining alone. The marginally higher cutting force associated with the application of cryogenic compressed air compared with dry machining is the result of lower chip temperatures and a higher shear plane angle. The tendency to form a segmented chip is higher when machining with cryogenic compressed air than that with compressed air and dry machining only within the ranges of cutting speed and feed when chip transitions from continuous to the segmented. The effect of cryogenic compressed air on the cutting force and chip formation diminishes with increase in cutting speed and feed rate. The application of both compressed air and cryogenic compressed air reduced flank wear and the tendency to form the chip built-up edge. This resulted in a smaller increase in cutting forces (more significantly in the feed force) after cutting long distance compared with that observed in dry machining.
Milan Brandt - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic compressed air on the evolution of cutting force and tool wear during machining of ti 6al 4v alloy
Journal of Materials Processing Technology, 2015Co-Authors: Shoujin Sun, Milan Brandt, S Palanisamy, Matthew S DarguschAbstract:Abstract The effect of cryogenic compressed air cooling on tool wear and cutting forces during cutting Ti–6Al–4V alloy has been investigated at two cutting speeds at which cutting tool fails as the result of gradual flank wear and catastrophic plastic deformation of the cutting edge, respectively, during dry machining. It is found that the application of cryogenic compressed air dramatically increased tool life compared with dry machining, and the increase in tool life was more significant at higher cutting speed as the plastic deformation of cutting edge that occurred during dry machining was suppressed during machining with cryogenic compressed air cooling. The improvement of tool life with application of cryogenic compressed air cooling during machining is attributed to the low temperature and high pressure of cryogenic air jet, which leads to the reduction in cutting temperature due to the enhanced cooling and reduction in tool-chip contact length. Low cutting temperature results in reducing wear rate, size of chip built-up edge and maintaining the strength of the cutting edge in order to resist plastic deformation.
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machining ti 6al 4v alloy with cryogenic compressed air cooling
International Journal of Machine Tools & Manufacture, 2010Co-Authors: Shoujin Sun, Milan Brandt, Matthew S DarguschAbstract:A new cooling approach with cryogenic compressed air has been developed in order to cool the cutting tool edge during turning of Ti–6Al–4V alloy. The cutting forces, chip morphology and chip temperature were measured and compared with those measured during machining with compressed air cooling and dry cutting conditions. The chip temperature is lower with cryogenic compressed air cooling than those with compressed air cooling and dry machining. The combined effects of reduced friction and chip bending away from the cutting zone as a result of the high-speed air produce a thinner chip with cryogenic compressed air cooling and a thicker chip with compressed air cooling compared to dry machining alone. The marginally higher cutting force associated with the application of cryogenic compressed air compared with dry machining is the result of lower chip temperatures and a higher shear plane angle. The tendency to form a segmented chip is higher when machining with cryogenic compressed air than that with compressed air and dry machining only within the ranges of cutting speed and feed when chip transitions from continuous to the segmented. The effect of cryogenic compressed air on the cutting force and chip formation diminishes with increase in cutting speed and feed rate. The application of both compressed air and cryogenic compressed air reduced flank wear and the tendency to form the chip built-up edge. This resulted in a smaller increase in cutting forces (more significantly in the feed force) after cutting long distance compared with that observed in dry machining.
Rômulo Magno Oliveira De ,freitas - One of the best experts on this subject based on the ideXlab platform.
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Propagação vegetativa de romã com material vegetal de diferentes origens sob tipos de substratos
2017Co-Authors: Rômulo Magno Oliveira De ,freitas, Coelho, Maria De Fatima Barbosa, Nogueira, Narjara Walessa, Pereira Leal, Caio César, Andreya Kaliana De ,oliveiraAbstract:The objective of this study to investigate the influence of different sources of plant material and substrates in the vegetative propagation of pomegranate (Punica granatum L.). The statistical design was completely randomized in a 2x3 factorial, with two origins of the plant material collected (Barreiras, CE and Mossoró, RN) and three substrates (Tropstrato®, Coconut fiber and soil), constituting six treatments and four replications. Each replication consisted of five cuttings. Cuttings were prepared with the aid of a pruning shears collected in the median position of the branch for the standardized diameter of 2 to 4 mm. At 45 days, we assessed the number of shoots per cutting, length of the longest shoot, number of leaves per cutting,length of roots, rooting percentage, number of roots per cutting, dry weight and dry weight of sprouting root system. The propagation by cutting of pomegranate is influenced by the origin of the vegetal material and the best material is of Barreiras, CE. The Tropstrato® substrates are recommended for the production of pomegranate seedlings by cuttings.Objetivou-se com o presente trabalho verificar a influência de diferentes procedências do material vegetal e substratos na propagação vegetativa de romã (Punica granatum L.). Foi usado o delineamento estatístico inteiramente casualizado em esquema fatorial 2x3, sendo duas origens do material vegetal (Barreiras, CE e Mossoró, RN) e três substratos (Tropstrato®, Fibra de coco e Solo), constituindo 6 tratamentos em quatro repetições de cinco estacas. As estacas foram preparadas com o auxilio de uma tesoura de poda, coletadas na posição mediana do ramo, padronizadas para o diâmetro de 2 a 4 mm. Aos 45 dias foram avaliados o número de brotos por estaca, comprimento do maior broto, número de folhas por estacas, comprimento da maior raiz, percentagem de estacas enraizadas, número de raízes por estaca, massa seca da brotação e massa seca do sistema radicular. A propagação por estaquia de romã é influenciada pela origem do material vegetal e o melhor material é de Barreiras, CE. Recomenda-se o substrato Tropstrato® para a produção de mudas de romã por estaquia
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Propagação vegetativa de romã com material vegetal de diferentes origens sob tipos de substratos
Grupo Verde de Agroecologia e Abelhas (GVAA), 2017Co-Authors: Rômulo Magno Oliveira De ,freitas, Maria De Fatima Barbosa Coelho, Narjara Walessa Nogueira, Caio César Pereira Leal, Andreya Kalyana De OliveiraAbstract:Objetivou-se com o presente trabalho verificar a influência de diferentes procedências do material vegetal e substratos na propagação vegetativa de romã (Punica granatum L.). Foi usado o delineamento estatístico inteiramente casualizado em esquema fatorial 2x3, sendo duas origens do material vegetal (Barreiras, CE e Mossoró, RN) e três substratos (Tropstrato®, Fibra de coco e Solo), constituindo 6 tratamentos em quatro repetições de cinco estacas. As estacas foram preparadas com o auxilio de uma tesoura de poda, coletadas na posição mediana do ramo, padronizadas para o diâmetro de 2 a 4 mm. Aos 45 dias foram avaliados o número de brotos por estaca, comprimento do maior broto, número de folhas por estacas, comprimento da maior raiz, percentagem de estacas enraizadas, número de raízes por estaca, massa seca da brotação e massa seca do sistema radicular. A propagação por estaquia de romã é influenciada pela origem do material vegetal e o melhor material é de Barreiras, CE. Recomenda-se o substrato Tropstrato® para a produção de mudas de romã por estaquia.Vegetative propagation of pomegranate with vegetal material of different origins under types of substratesAbstract: The objective of this study to investigate the influence of different sources of plant material and substrates in the vegetative propagation of pomegranate (Punica granatum L.). The statistical design was completely randomized in a 2x3 factorial, with two origins of the plant material collected (Barreiras, CE and Mossoró, RN) and three substrates (Tropstrato®, Coconut fiber and soil), constituting six treatments and four replications. Each replication consisted of five cuttings. Cuttings were prepared with the aid of a pruning shears collected in the median position of the branch for the standardized diameter of 2 to 4 mm. At 45 days, we assessed the number of shoots per cutting, length of the longest shoot, number of leaves per cutting, length of roots, rooting percentage, number of roots per cutting, dry weight and dry weight of sprouting root system. The propagation by cutting of pomegranate is influenced by the origin of the vegetal material and the best material is of Barreiras, CE. The Tropstrato® substrates are recommended for the production of pomegranate seedlings by cuttings.
M. F. Azhar - One of the best experts on this subject based on the ideXlab platform.
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Tool wear and chip morphology in high-speed milling of hardened Inconel 718 under dry and cryogenic CO2 conditions
Wear, 2019Co-Authors: N. H.a. Halim, J. A. Ghani, Che Hassan Che Haron, M. F. AzharAbstract:This paper details an investigation into the performance of PVD tungsten carbide coated ball nose milling inserts when conducting high-speed cutting of Inconel 718 under eco-friendly machining methods of cryogenic carbon dioxide (CO2) and dry cutting conditions. The experiments were performed at varying cutting parameters of; cutting speed: 120–140 m/min, feed rate: 0.15–0.25 mm/tooth, and axial depth of cut: 0.3–0.7 mm. The radial depth of cut was kept constant at 0.4 mm. A new cryogenic CO2 cooling system was introduced for efficient and consistent cooling performance during cutting. The analysis includes the tool life, tool wear patterns and mechanisms as well as its relationship with the chips’ morphology. The experimental results showed that cryogenic and dry cutting conditions reported approximately similar tool wear patterns. The tool wear started with smooth abrasion and chipping around the depth of cut line, which then progressed into flank wear and finally notching and flaking via mechanisms of abrasive and adhesive wears. However, severe BUE was repeatedly observed under dry cutting, which widened the flaking and accelerated the notching. Hence, cryogenic CO2 showed significant improvement towards increasing the tool life to a maximum of 70.8% relative to dry cutting. The consistent cooling effect by the cryogenic CO2 managed to efficiently reduce the cutting temperature at the cutting point to 80% compared to dry cutting, which is believed to be the main factor causing the aforementioned improvement. The strong influence of cutting conditions and tool wear patterns upon the chip morphology was also evident. Compared to cryogenic cutting, the shape and colour of the chips were found to be severe, distorted, and darker in dry cutting, which confirmed that it was thermally affected by the high cutting temperature.
