Study on surface integrity in drilling Inconel 718 with uncoated and PVD coated tools
(2021) MMTM05 20211Production and Materials Engineering
- Abstract
- Belonging to the group of Nickel-based superalloys, Inconel 718 has excellent oxidation resistance and high-temperature strength, which is crucial for applications in the aerospace industry, for example, the manufacturing of components for engines. The low machinability of Inconel 718 demands the higher performance of the cutting tool. Drilling is one of the conventional machining operations applying to the component in engines. The objective of the present thesis work was to investigate the coating effects of drill bits on surface integrity in drilling Inconel 718 alloy. Three drill bits were used for drilling tests, including one uncoated and two PVD coated drills. Tested drill bits were considered worn when reaching flank wear 0.2 mm as... (More)
- Belonging to the group of Nickel-based superalloys, Inconel 718 has excellent oxidation resistance and high-temperature strength, which is crucial for applications in the aerospace industry, for example, the manufacturing of components for engines. The low machinability of Inconel 718 demands the higher performance of the cutting tool. Drilling is one of the conventional machining operations applying to the component in engines. The objective of the present thesis work was to investigate the coating effects of drill bits on surface integrity in drilling Inconel 718 alloy. Three drill bits were used for drilling tests, including one uncoated and two PVD coated drills. Tested drill bits were considered worn when reaching flank wear 0.2 mm as the end of tool life. During the tests, tool life, feed force, radial force, and spindle torque were measured and used as indicators of tool wear. After the drilling test, the measurements of the diameter of the drilled holes and the burrs were inspected with light optical microscopy. Then, the cross-sectional holes were sectioned by a wire electrical discharge machine (EDM) for the surface topography and surface roughness analysis. Sample preparations on the hoop plane of cross-sectional holes were conducted after twice sectioning by wire EDM for microstructural analysis. In microstructural analysis, the material drag layer on hoop direction was observed, and the thickness of the layer was found to be associated with tool wear or cutting length. The drill with PVD coating demonstrated a longer tool life and produced better surface quality on the machined surface. The drill bit with four coolant channels instead of two showed better cooling performance, which leads to extending the tool life by reducing the flank wear. (Less)
- Popular Abstract
- Belonging to the group of Nickel-based superalloys, Inconel 718 has excellent oxidation resistance and high-temperature strength, which is crucial for applications in the aerospace industry, for example, the manufacturing of components for engines. The low machinability of Inconel 718 demands the higher performance of the cutting tool. Drilling is one of the conventional machining operations applying to the component in engines. The objective of the present thesis work was to investigate the coating effects of drill bits on surface integrity in drilling Inconel 718 alloy. Three drill bits were used for drilling tests, including one uncoated and two PVD coated drills. Tested drill bits were considered worn when reaching flank wear 0.2 mm as... (More)
- Belonging to the group of Nickel-based superalloys, Inconel 718 has excellent oxidation resistance and high-temperature strength, which is crucial for applications in the aerospace industry, for example, the manufacturing of components for engines. The low machinability of Inconel 718 demands the higher performance of the cutting tool. Drilling is one of the conventional machining operations applying to the component in engines. The objective of the present thesis work was to investigate the coating effects of drill bits on surface integrity in drilling Inconel 718 alloy. Three drill bits were used for drilling tests, including one uncoated and two PVD coated drills. Tested drill bits were considered worn when reaching flank wear 0.2 mm as the end of tool life. During the tests, tool life, feed force, radial force, and spindle torque were measured and used as indicators of tool wear. After the drilling test, the measurements of the diameter of the drilled holes and the burrs were inspected with light optical microscopy. Then, the cross-sectional holes were sectioned by a wire electrical discharge machine (EDM) for the surface topography and surface roughness analysis. Sample preparations on the hoop plane of cross-sectional holes were conducted after twice sectioning by wire EDM for microstructural analysis. In microstructural analysis, the material drag layer on hoop direction was observed, and the thickness of the layer was found to be associated with tool wear or cutting length. The drill with PVD coating demonstrated a longer tool life and produced better surface quality on the machined surface. The drill bit with four coolant channels instead of two showed better cooling performance, which leads to extending the tool life by reducing the flank wear. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9053495
- author
- Du, Shao LU
- supervisor
- organization
- course
- MMTM05 20211
- year
- 2021
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Inconel 718, Drilling, Surface integrity, PVD coating, Cooling
- report number
- CODEN:LUTMDN/(TMMV-5320)/1-67/2021
- language
- English
- id
- 9053495
- date added to LUP
- 2021-06-13 14:36:51
- date last changed
- 2021-06-13 14:36:51
@misc{9053495,
abstract = {{Belonging to the group of Nickel-based superalloys, Inconel 718 has excellent oxidation resistance and high-temperature strength, which is crucial for applications in the aerospace industry, for example, the manufacturing of components for engines. The low machinability of Inconel 718 demands the higher performance of the cutting tool. Drilling is one of the conventional machining operations applying to the component in engines. The objective of the present thesis work was to investigate the coating effects of drill bits on surface integrity in drilling Inconel 718 alloy. Three drill bits were used for drilling tests, including one uncoated and two PVD coated drills. Tested drill bits were considered worn when reaching flank wear 0.2 mm as the end of tool life. During the tests, tool life, feed force, radial force, and spindle torque were measured and used as indicators of tool wear. After the drilling test, the measurements of the diameter of the drilled holes and the burrs were inspected with light optical microscopy. Then, the cross-sectional holes were sectioned by a wire electrical discharge machine (EDM) for the surface topography and surface roughness analysis. Sample preparations on the hoop plane of cross-sectional holes were conducted after twice sectioning by wire EDM for microstructural analysis. In microstructural analysis, the material drag layer on hoop direction was observed, and the thickness of the layer was found to be associated with tool wear or cutting length. The drill with PVD coating demonstrated a longer tool life and produced better surface quality on the machined surface. The drill bit with four coolant channels instead of two showed better cooling performance, which leads to extending the tool life by reducing the flank wear.}},
author = {{Du, Shao}},
language = {{eng}},
note = {{Student Paper}},
title = {{Study on surface integrity in drilling Inconel 718 with uncoated and PVD coated tools}},
year = {{2021}},
}