| 1. |
- Azarhoushang, Bahman, et al.
(författare)
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High-speed high-efficient grinding of CMCs with structured grinding wheels
- 2019
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Ingår i: International Journal of Abrasive Technology. - 1752-2641 .- 1752-265X. ; 9:1, s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- The implantation of ceramic matrix composites (CMCs) is limited due to their high machining costs. To overcome this problem, modified grinding wheels, one macro-structured by segmenting and another laser-structured were used. The grinding tests were carried out at different material removal rates and cutting speeds. The grinding forces, surface roughness, and induced residual stress were compared. The results showed that the wheel structuring resulted in a better performance of the grinding wheel. The grinding forces were respectively 30% and 20% lower in the case of segmented wheel and laser-structured wheel in comparison with the conventional grinding. In addition, the tensile residual stress was reduced as a negative output of the grinding process via structuring. A high-speed high-efficient grinding of CMCs without presence of surface damage was achieved by optimising the process parameters. The material removal rate could be elevated without changing the grinding forces with application of the structured wheel.
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| 2. |
- Azarhoushang, Bahman, et al.
(författare)
-
High-speed high-efficient grinding of CMCs with structured grinding wheels
- 2018
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Ingår i: ISAAT 2018 - 21st International Symposium on Advances in Abrasive Technology.
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Konferensbidrag (refereegranskat)abstract
- Ceramic Matrix Composites (CMCs) are counted as new materials which their implantation is limited due to their high machining costs as a result of high grinding forces and tool wear. To overcome mentioned problems, modified grinding wheels, one macro-structured by segmenting and another micro-structured (half lasered structured and half non-structured) were used in this study. The grinding tests were carried out at different material removal rates and cutting speeds. The grinding forces, generated surface roughness, and induced residual stress by means of grinding with the structured and non-structured wheels were compared. Reduction in the static cutting edges via wheel structuring resulted in a better performance of the grinding wheel through the reduction of rubbing and ploughing regimes. The grinding forces were respectively 30% and 20% lower in the case of segmented wheel and laser-structured wheel in comparison with the conventional grinding. In addition, the tensile residual stress can be reduced as a negative output of the grinding process via structuring. Moreover, a high-speed high-efficient grinding of CMCs without presence of surface damage was achieved by optimizing the process parameters. The material removal rate can be elevated without changing the grinding forces with application of the structured wheel.
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| 3. |
- Kadivar, Mohammadali, 1987, et al.
(författare)
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Modeling of the micro-grinding process considering the grinding tool topography
- 2017
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Ingår i: ISAAT 2017 - Proceedings of the 20th International Symposium on Advances in Abrasive Technology. ; 8:2, s. 157-170
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Konferensbidrag (refereegranskat)abstract
- The micro topography of the grinding tool has a considerable influence on the cutting forces and temperature as well as the tool wear. This paper addresses an analytical modeling of the micro-grinding process based on the real tool topography and kinematic modeling of the cutting-edge-workpiece interactions. An approximate shape of the abrasive grains and their distribution is obtained from the confocal images, which are taken from the tool surface – determining the grain height protrusion and the probability density function of the grains. To determine the grinding forces, a transient kinematic approach is developed. In this method, the individual grit interaction with the workpiece is extended to the whole cutting zone in the peripheral flank grinding operation. Hence a predictive model of cutting forces and surface roughness in micro grinding of titanium grade 5 is developed. Finally, the simulated forces and surface roughness are validated by the experimental results.
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