Effect of post-quench delay on stress relieving by cold compression for the aluminium alloy 7050

2014 ◽  
Vol 31 (4) ◽  
pp. 409-417 ◽  
Author(s):  
J. S. Robinson ◽  
P. J. Tiernan ◽  
J. F. Kelleher
Keyword(s):  
Aluminium Alloy ◽  
Cold Compression ◽  
Stress Relieving ◽  
Aluminium Alloy 7050

Study on the Influence of Anisotropy on Cutting Performance of Aviation Aluminium Alloy 7050-T7451

2020 ◽  
Vol 990 ◽  
pp. 29-35
Author(s):  
Hui Wang ◽  
Ying Meng ◽  
Duo Duo Li ◽  
Xiu Li Fu ◽  
Qi Hang Shi
Keyword(s):  
Aluminium Alloy ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Cutting Performance ◽  
Rolled Sheet ◽  
Feed Speed ◽  
Aluminium Alloy 7050 ◽  
Degree Of Anisotropy ◽  
Forming Angle

Based on the hypocycloid theory, a highspeed orthogonal cutting simulation model was established. The cutting parameters (cutting speed, feed rate) and plane forming angle of the workpiece of aeronautical aluminium alloy 7050-T7451 pre-stretched rolled sheet were simulated and validated. The mapping relationship between cutting parameters, anisotropy and cutting performance was analyzed. The results show that the degree of anisotropy and the difficulty of material cutting are proportional to the forming angle, and the anisotropy decreases with the increase of cutting speed and the decrease of feed speed. Finally, the optimal cutting process range of aluminum alloy 7050-T7451 was obtained, which provides data support for highspeed cutting of anisotropic materials.

scholarly journals Prediction and Measurement of Machining Distortion in Aluminium Alloy 7085

2014 ◽  
Vol 996 ◽  
pp. 640-645 ◽  
Author(s):  
Zhang Zheng ◽  
Liang Li ◽  
Yin Fei Yang ◽  
Ning He ◽  
Wei Zhao
Keyword(s):  
Numerical Methods ◽  
Stress Field ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Experimental Verification ◽  
Structural Part ◽  
Cold Compression ◽  
Manufacturing Operations ◽  
Part Distortion ◽  
Good Agreement

It is essential to accurately predict or model the residual stresses in a material resulting from various manufacturing operations. Numerical methods were used in this study to predict the residual stresses after quenching and cold compression of an Al 7085 forged block. Experimental verification was provided by comparing the measured distortions due to a relaxation of the residual stresses with the predictions obtained by using a simulated stress field. The validation was carried out on a simplified structural part. The measured and simulated distortions were found to be in good agreement with each other. The results indicated that part distortion is attributable to the relaxation of bulk residual stresses.

Residual Stress Relief in the Aluminium Alloy 7075

2017 ◽  
Vol 905 ◽  
pp. 31-39 ◽  
Author(s):  
Jeremy S. Robinson ◽  
Christopher E. Truman ◽  
Thilo Pirling ◽  
Tobias Panzner
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Stress Relief ◽  
Residual Stress Distribution ◽  
Cold Compression ◽  
Heat Treated ◽  
Minimum Residual

The residual stresses in heat treated 7075 aluminium alloy blocks have been characterised using two neutron diffraction strain scanning instruments. The influence of uniaxial cold compression (1-10%) on relieving the residual stress has been determined. Increasing the magnitude of cold compression from 1 to 10% has been shown to have a beneficial effect on the residual stress distribution by reducing the range between the maximum and minimum residual stresses. The effect of over aging 7075 on residual stress has also been characterised using neutron diffraction and this was found to reduce the residual stress by 25-40%. A relationship between {311} peaks widths and amount of cold compression was also observed.

Machinability study of aircraft series aluminium alloys 7075-T6 and 7050-T7451

2020 ◽  
Vol 44 (3) ◽  
pp. 427-439
Author(s):  
Ali Yeganefar ◽  
Seyed Ali Niknam ◽  
Victor Songmene
Keyword(s):  
Aluminium Alloy ◽  
Surface Quality ◽  
Aluminium Alloys ◽  
End Milling ◽  
Experimental Studies ◽  
Burr Formation ◽  
Limited Information ◽  
Milling Operations ◽  
Aluminium Alloy 7050 ◽  
Machining Operations

The aluminium alloy 7050-T7451 is generally considered as the principal choice in aeronautical applications demanding adequate strength, stress corrosion cracking resistance, and toughness. Surprisingly, despite extensive research works on machining and machinability of aluminium alloys, including aluminium alloy 7075-T6, limited information was found on machining and machinability evaluation of 7050-T7451, which belongs to a similar family as 7075-T6. To remedy the lack of knowledge determined, dry ball-end milling operations were performed with coated end milling tools on both materials. Experimental characterization and cutting force measurements were performed to measure/evaluate the cutting forces, burr formation morphology, insert performance (wear/breakage), and surface quality attributes. According to experimental studies, 7050-T7451 was found more machinable than 7075-T6. Less burr formation and better surface quality were observed on 7075-T6. Machining attributes are influenced by different experimental factors. However, other machinability attributes, including residual stress, vibration modes, as well as particle emission, must be studied under various lubrication modes and machining operations in subsequent studies. This also recalls further studies on simultaneous multiple response optimization.

Prediction of grain size for large-sized aluminium alloy 7050 forging during hot forming

2008 ◽  
Vol 15 (1) ◽  
pp. 1-5 ◽  
Author(s):  
You-ping Yi ◽  
Xin Fu ◽  
Jin-dong Cui ◽  
Hua Chen
Keyword(s):  
Grain Size ◽  
Aluminium Alloy ◽  
Hot Forming ◽  
Aluminium Alloy 7050
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