| 1. |
- Avdovic, Pajazit, 1955, et al.
(författare)
-
Evaluating the machinability of Inconel 718 using polar diagrams
- 2010
-
Ingår i: Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010, Glasgow, United Kingdom, 14-18 June 2010. - 9780791843963 ; 1, s. 987-996
-
Konferensbidrag (refereegranskat)abstract
- The use of a polar diagram method for describing and evaluating the machinability of Inconel 718 was explored. Five key parameters of the work material, representing the mechanical and physical properties which have strongest influence on its machinability, were employed in the diagrams. These five parameters were integrated into a single polar diagram, used to describe the machinability of Inconel 718. Variations in the machinability of Inconel 718 products or components of a given type produced in different batches were analyzed. Industrial experiments were conducted to test the relationship between the polar diagram of the work material, its carbon content, and tool wear of the ceramic cutting tools used in machining it. Work materials of Inconel 718 in which the polar diagrams of machinability were similar in size and shape exhibited very similar behavior during the cutting process. The polar diagram method employed appeared to be useful for selecting suitable cutting data for the machining of new materials.
|
|
| 2. |
- Avdovic, Pajazit, 1955, et al.
(författare)
-
Evaluating the Machinability of Inconel 718 Using Polar Diagrams
- 2011
-
Ingår i: Journal of Engineering for Gas Turbines and Power. - : ASME International. - 1528-8919 .- 0742-4795. ; 133:7
-
Tidskriftsartikel (refereegranskat)abstract
- The use of a polar diagram method for describing and evaluating the machinability of Inconel 718 was explored. Five key parameters of the work material, representing the mechanical and physical properties, which have the strongest influence on its machinability, were employed in the diagrams. These five parameters were integrated into a single polar diagram, used to describe the machinability of Inconel 718. Variations in the machinability of Inconel 718 products or components of a given type produced in different batches were analyzed. Industrial experiments were conducted to test the relationship between the polar diagram of the work material, its carbon content, and the tool wear of the ceramic cutting tools used in machining it. Work materials of Inconel 718 in which the polar diagrams of machinability were similar in size and shape exhibited very similar behavior during the cutting process. The polar diagram method employed appeared to be useful for selecting suitable cutting data for the machining of new materials. [DOI: 10.1115/1.4002679]
|
|
| 3. |
- Avdovic, Pajazit, 1955
(författare)
-
Machinability variations in alloy 718 turbine components
- 2009
-
Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Machinability Variations in Alloy 718 Turbine Components PAJAZIT AVDOVIC Department of Materials and Manufacturing TechnologyChalmers University of Technology AbstractAlloy 718 has a reputation for being very troublesome during the cutting process. It was suspected that this material was too hard and having too fine grain size and that these characteristics caused damage to cutting tools during processing. Sometimes it was difficult to machine in different regions in the same detail. In some cases it was possible to machine some discs without any problems whilst at the same time a number of discs were very difficult to treat. For Alloy 718 machined with Al2O3SiCW ceramic tools the main types of wear are mainly notch wear, flank wear and top slice wear. From retrieving spent round C670 tools in production, it was found that an optimum effective cutting angle range existed in terms of insert wear. This means that if the effective cutting edge length is controlled through programming for each feed rate lower wear rates should be obtained. To study the influence of different grain sizes, Alloy 718 work-piece material was heat treated. The results showed that the limiting wear type is the notch wear that occurred at the end of depth of cut, but that, no valid difference between rings with small (ASTM 8) and large grain sizes (ASTM 3.5) in terms of flank wear or notch depth were observed. However, burr formation was observed for both materials, but of different appearance depending primarily on grain size. The large grain size gave burr formation on the surface perpendicular to the cut surface, while the small grain size gave burr formation on the cut surface. Moreover, the wear characteristics and type of burr were accordingly obtained for the material with smaller grain size (ASTM 8) as in production with the same grain size. The implication of these results is that it may be possible to select more aggressive cutting parameters as long as the flank-wear remains below 0.3 mm and the notch wear is limited either through path programming (by varying depth of cut) or by reducing feed rate to
|
|
