Abstract
This research work focus on dry finishing (turning) of AA7075. Newly, emerging alloy target–based ternary PVD–coated tool inserts are compared with non-alloy target–based binary and ternary-coated tool inserts. The coatings include novel alloy target coatings TiAlN (80:20), TiAlN (70:30), and TiAlN (50:50) and non-alloy target coatings TiN and TiCN. One uncoated and five coated tungsten carbide (WC) inserts are analyzed for maximum tool life and minimum surface roughness in dry machining (finish turning) process. Depth of cut, feed rate, and cutting speed are operational parameters optimized against performance parameters (tool life and surface roughness) using a two-stage design of experiment approach. Initial experiments are carried out using L18 (6133) special orthogonal array. General linear model (GLM), linear regression model (LR), and stepwise forward regression model (SFR) are used for analysis. Among alloy target–based PVD–coated tool inserts, TiAlN (50:50) and TiAlN (70:30) performed better in terms of tool life and surface roughness respectively. The TiN-coated tool insert is found as overall superior performing tool insert considering the finished products roughness concerns of aero industry. The optimized solution for TiN is obtained by designing a full factorial experimental configuration. At low feed rate and low cutting speed, high feed rate and low cutting speed, and high feed rate and high cutting speed, approximately 45%, 47%, and 29% higher surface finish can be obtained respectively. Similarly, at low feed rate and low cutting speed and high feed rate and medium cutting speed, approximately 136% and 146% longer tool life can be obtained respectively. A combined saving, i.e., 27% high surface finish, 32% longer tool life and 16% higher material removal rate, can be obtained for optimized setting. Comparing the optimized results with L18 experiments, the optimized solution can give approximately 42% higher surface finish and above 300% longer tool life. Results are discussed on the basis of response surfaces, scanning electron microscopy, and chip roughness profile.
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Abbreviations
- AA7075:
-
Aluminum alloy 7075
- WC:
-
Tungsten carbide
- TiN:
-
Titanium nitride
- TiCN:
-
Titanium carbo nitride
- TiAlN (80:20):
-
Titanium aluminum nitride produced from alloy target with 80% titanium and 20% aluminum
- TiAlN (70:30):
-
Titanium aluminum nitride produced from alloy target with 70% titanium and 30% aluminum
- TiAlN (50:50):
-
Titanium aluminum nitride produced from alloy target with 50% titanium and 50% aluminum
- Insert 1:
-
Uncoated tungsten carbide tool insert
- Insert 2:
-
TiN coated tungsten carbide tool insert
- Insert 3:
-
TiCN coated tungsten carbide tool insert
- Insert 4:
-
TiAlN (80:20) coated tungsten carbide tool insert
- Insert 5:
-
TiAlN (70:30) coated tungsten carbide tool insert
- Insert 6:
-
TiAlN (50:50) coated tungsten carbide tool insert
- GLM:
-
General linear model
- LR:
-
Linear regression
- SFR:
-
Stepwise forward regression
- CMM:
-
Coordinate measuring machine
- PVD:
-
Physical vapor deposition
- DOC:
-
Depth of cut
- FR:
-
Feed rate
- CS:
-
Cutting speed
- CR:
-
Confirmatory run
- FS:
-
Factor selection
- RSM:
-
Response surface methodology
- SEM:
-
Scanning electron microscopy
- BUE:
-
Build-up edges
- DOE:
-
Design of experiments
- MRR:
-
Material removal rate
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Zubair, S.W.H., Arafat, S.M., Khan, S.A. et al. Dry finishing turning of AA7075 with binary and ternary nitrides and carbides ceramic-coated tools. Int J Adv Manuf Technol 129, 65–87 (2023). https://doi.org/10.1007/s00170-023-12105-6
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DOI: https://doi.org/10.1007/s00170-023-12105-6