| 44161. |
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| 44162. |
- Kraiphanont, Amolnut, et al.
(författare)
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The Main Criteria of Biomass Selection for Energy Generation in Brazil
- 2016
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Ingår i: Proceedings of 25th International Conference of the International Association for Management of Technology, IAMOT 2016, Orlando, United States, 15-19 May 2016. - 9780981581781 ; , s. 759-774
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Konferensbidrag (refereegranskat)abstract
- The principal aim of this paper is to examine the criteria assisting in the selection of biomass for energy generation in Brazil. To reach the aim, this paper adopts case study and survey research methods to collect information from four biomass energy case companies and solicits opinions from experts. The data gathered are analysed in line with a wide range of related data, including selection criteria for biomass and its importance, energy policies in Brazil, availability of biomass feedstock in Brazil and its characteristics, as well as status quo of biomass-based energy in Brazil. The findings of the paper demonstrate that there are ten main criteria in biomass selection for energy generation in Brazil. They comprise geographical conditions, availability of biomass feedstock, demand satisfaction, feedstock costs and oil prices, energy content of biomass feedstock, business and economic growth,CO2 emissions of biomass end-products, effects on soil, water and biodiversity, job creation and local community support, as well as conversion technologies. Furthermore, the research also found that these main criteria cannot be grouped on the basis of sustainability criteria, nor ranked by their importance as there is correlation between each criterion such as a cause and effect relationship, as well as some overlapping areas. Consequently, this means thatwhen selecting biomass more comprehensive consideration is advisable.
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| 44163. |
- Krajňáková, P.G., et al.
(författare)
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Effect of double electron beam remelting on microstructure of HVOF and CGDS bond coat
- 2017
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Ingår i: Materials Science Forum. - 1662-9752 .- 0255-5476. - 9783035710182 ; 891, s. 574-578
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Konferensbidrag (refereegranskat)abstract
- This work focuses to investigate the influence of the parameters used in electron beam (EB) remelting including the effect of double remelting of CoNiCrAlY coatings fabricated on Nickel based super alloy substrates by using the high velocity oxygen-fuel (HVOF) and cold gas dynamic spraying (CGDS) methods. The microstructure of as sprayed and remelted coatings were investigated by scanning electron microscopy and the phase analysis by X-ray diffraction (XRD). The results obtained show that there are advantages at using the pulsed EB surface modification technique. Double EB treatment provides a smooth surface and low porosity level and at last but not least this study demonstrate that low-temperature processing of CoNiCrAlY bond coat represents an interesting and promising alternative for their manufacturing.
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| 44164. |
- Krajnik, Peter, 1977, et al.
(författare)
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Finishing
- 2018
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Ingår i: CIRP Encyclopedia of Production Engineering. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783642359507 ; , s. 1-9
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Finishing is the final step in the manufacture of components which require the highest quality in terms of form, accuracy and surface integrity. Fine-finishing is an operation that adds functionality to the workpiece surface to enhance its quality characteristics.
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| 44165. |
- Krajnik, Peter, 1977, et al.
(författare)
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Grinding and fine finishing of future automotive powertrain components
- 2021
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Ingår i: CIRP Annals - Manufacturing Technology. - : Elsevier BV. - 1726-0604 .- 0007-8506. ; 70:2, s. 589-610
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Tidskriftsartikel (refereegranskat)abstract
- The automotive industry is undergoing a major transformation driven by regulations and a fast-paced electrification. A critical analysis of technological trends and associated requirements for major automotive powertrain components is carried out in close collaboration with industry – covering the perspectives of OEMs, suppliers, and machine builders. The main focus is to review the state of the art with regard to grinding, dressing, texturing and fine-finishing technologies. A survey of research papers and patents is accompanied by case studies that provide further insights into the production value chain. Finally, key industrial and research challenges are summarized.
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| 44166. |
- Krajnik, Peter, 1977, et al.
(författare)
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High-performance industrial grinding: recent advances and case studies from the automotive engine production
- 2016
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Ingår i: 19th International Symposium on Advances in Abrasive Technology, ISAAT 2016; Stockholm; Sweden. ; , s. 1-13
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Konferensbidrag (refereegranskat)abstract
- The development of new high-performance industrial grinding technologies for engine production in the automotive industry is presented. The grinding fundamentals are revisited in view of modeling and simulation to examine the effects of process design on grinding temperatures. The advantages associated with utilization of newly developed temperature-controlled grinding processes are explained via the analysis of process-control strategies. Two research-and-development projects from Scania´s engine-production plant are discussed to illustrate industrial challenges and achieved impacts. Two case studies are presented for (1) cam-lobe grinding and (2) crankpin grinding, demonstrating optimized grinding processes for achieving shorter cycle times and higher quality. Both patent-pending technologies are experimentally validated in actual production and are implemented in existing production lines.
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| 44167. |
- Krajnik, Peter, et al.
(författare)
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Method of grinding a workpiece and method for determining processing parameters
- 2017
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The present disclosure relates to a grinding method for grinding of non-circular workpieces with an improved productivity and quality of the resulting workpiece. The method comprises a first and a second stage. The rotational speed profile of the workpiece in the first stage is controlled with the purpose of maintaining a pre-selected maximum surface temperature of the workpiece during said first stage, and grinding of the workpiece in said second stage is performed while controlling an aggressiveness number of said second stage so as to achieve an intended final surface quality. The present disclosure also relates to a method for determining the processing parameters of such a grinding method wherein the first and the second stage of the grinding method are iterated to thereby determine the processing parameters leading to a high productivity and desired quality of the workpiece after grinding.
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| 44168. |
- Krajnik, Peter, 1977, et al.
(författare)
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Method of grinding a workpiece and method for determining processing parameters
- 2019
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The present disclosure relates to a grinding method for grinding of non-circular workpieces with an improved productivity and quality of the resulting workpiece. The method comprises a first and a second stage. The rotational speed profile of the workpiece in the first stage is controlled with the purpose of maintaining a pre-selected maximum surface temperature of the workpiece during said first stage, and grinding of the workpiece in said second stage is performed while controlling an aggressiveness number of said second stage so as to achieve an intended final surface quality. The present disclosure also relates to a method for determining the processing parameters of such a grinding method wherein the first and the second stage of the grinding method are iterated to thereby determine the processing parameters leading to a high productivity and desired quality of the workpiece after grinding.
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| 44169. |
- Krajnik, Peter, et al.
(författare)
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Method of grinding a workpiece having a cylindrical bearing surface and method for determining processing parameters
- 2017
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- A method of grinding a workpiece by means of a grinding wheel is disclosed. The workpiece comprises a cylindrical bearing surface, a radially extending sidewall extending outward from the cylindrical bearing surface, and a curved transition portion connecting the cylindrical bearing surface with the sidewall. During grinding, the feed in an increment is selected so as to achieve a pre-set maximum surface temperature of the workpiece at a point of the grinding wheel resulting in the highest surface temperature of the workpiece. Furthermore, a method for determining processing parameters for such a grinding method is disclosed.
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| 44170. |
- Krajnik, Peter, 1977, et al.
(författare)
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Method of grinding a workpiece having a cylindrical bearing surface and method for determining processing parameters
- 2018
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- The present disclosure relates in general to a method of grinding a workpiece by means of a grinding wheel, the workpiece comprising a cylindrical bearing surface, a radially extending sidewall extending outward from the cylindrical bearing surface, and a curved transition portion connecting the cylindrical bearing surface with the sidewall. The present disclosure also relates to a method for determining processing parameters of such a grinding method.
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