Analysis of the Stress-Strained State of Billets Processed by Rotary Forging with Special Shape of the Tool

2019 ◽  
Vol 31 ◽  
pp. 16-21 ◽  
Author(s):  
Rashid Asfandiyarov ◽  
Georgy I. Raab ◽  
Denis Aksenov
Keyword(s):  
Cross Section ◽  
Physical Modeling ◽  
Pure Copper ◽  
Strained State ◽  
Elongation Ratio ◽  
Special Shape ◽  
Rotary Forging ◽  
Commercially Pure ◽  
Accumulated Strain ◽  
Commercially Pure Copper

In this paper, we investigated the process of rotary forging of commercially pure copper grade M2 ​​using standard and special-shaped anvils and presented the results of studies obtained by the method of numerical and physical modeling. It is established that the use of anvils with special geometric shapes provides a higher level of accumulated strain and the formation of more dispersed structural states with the same elongation ratio under conditions of multi-cycle processing [1]. The formation of a finer structure in its turn increases the hardness and strength of the material. In addition, the special shape of the anvils provides a positive field of values ​​of the Lode-Nadai coefficient in the cross section of the samples, predominantly in a range of 0.3-0.7 and, correspondingly, a more "comfortable" stress state close to non-uniform all-round compression, which contributes to increasing technological plasticity.

scholarly journals Microstructure and Mechanical Properties of Friction Stir Welded Joints Between Commercially Pure Copper and Al 6351 Alloy

2017 ◽  
Vol 62 (3) ◽  
pp. 1819-1825
Author(s):  
V.C. Sinha ◽  
S. Kundu ◽  
S. Chatterjee
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Rotational Speed ◽  
Pure Copper ◽  
Stir Zone ◽  
Tool Rotational Speed ◽  
Friction Stir ◽  
Commercially Pure ◽  
Microstructure And Mechanical Properties ◽  
Commercially Pure Copper

AbstractIn the present study, the effect of tool rotational speed on microstructure and mechanical properties of friction stir welded joints between commercially pure copper and 6351 Al alloy was carried out in the range of tool rotational speeds of 300-900 rpm in steps of 150 rpm at 30 mm/minutes travel speed. Up to 450 rpm, the interface of the joints is free from intermetallics and Al4Cu9intermetallic has been observed at the stir zone. However, Al4Cu9intermetallic was observed both at the interface and the stir zone at 600 rpm. At 750 and 900 rpm tool rotational speed, the layers of AlCu, Al2Cu3and Al4Cu9intermetallics were observed at the interface and only Al4Cu9intermetallics has been observed in the stir zone. The maximum ultimate tensile strength of ~207 MPa and yield strength of ~168 MPa along with ~6.2% elongation at fracture of the joint have been obtained when processed at 450 rpm tool rotational speed.

Measurement of the behaviour of high-purity copper at very high rates of strain

1995 ◽  
Vol 73 (5-6) ◽  
pp. 295-303 ◽  
Author(s):  
Frank Kamler ◽  
P. Niessen ◽  
R. J. Pick
Keyword(s):  
Additional Data ◽  
Pure Copper ◽  
Plate Impact ◽  
Commercially Pure ◽  
Shear Plate ◽  
Split Hopkinson ◽  
Impact Experiments ◽  
Very High ◽  
Commercially Pure Copper ◽  
Good Agreement

Published measurements describing the high strain rate constitutive behaviour of oxygen-free high-conductivity (OFHC) and commercially pure copper are limited and show considerable scatter. To provide additional data, a direct impact compressive split Hopkinson bar was miniaturized to utilize specimens, 640 μm in diameter and 686 and 292 μm in length. This paper describes the design of this apparatus and results for OFHC copper. Good agreement is shown with results from pressure shear plate impact experiments.

Correlation of Tempering Effects With Temperature Distribution in Steel Cutting Tools

1978 ◽  
Vol 100 (2) ◽  
pp. 131-136 ◽  
Author(s):  
P. K. Wright
Keyword(s):  
Temperature Distribution ◽  
Pure Copper ◽  
Cutting Tools ◽  
Experimental Methods ◽  
Heat Sources ◽  
Low Carbon ◽  
Commercially Pure ◽  
Commercially Pure Copper ◽  
Cutting Speeds ◽  
Steel Cutting

Experimental methods are described for determining the temperature distribution in steel cutting tools over the range 150 C to 1000 C. The techniques correlate temperature with changes in microstructure and hardness that arise due to the heat conducted into the tool. Results are presented for the machining of low carbon iron and commercially pure copper, and the effectiveness of cutting coolant is evaluated for a range of cutting speeds and for two different methods of application. Simple models for the heat sources in chip formation are derived and used to verify the experimental work by calculating the temperatures on the rake face.

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