Effects Of Mandrel Shank Positions And The Gap Values Between The Mandrel Balls And The Tube On The Thinning And The Ovality İn Rotary Draw Bending

Ozcan, Bahadir
Evis, Zafer
Tube and tube systems are very critical components to fulfill the design requirement of applications. Especially the bending radius is most important factor in a tube bending process. Therefore, as the bend ratio (bending radius/outer diameter of tube) and the wall thickness of the tube material decrease, the risk of encountering defects such as wrinkles, ovality, wall thinning, and crack increases. Rotary draw bending process is generally preferred for bending tubes with a small bend ratio and thin wall thickness. In this process, tools such as bend die, clamp die, clamp insert, pressure die, wiper die, and mandrel are used. For the minimum bending radius value can be accomplished considering the processes parameters such as material properties and geometry of tube, die geometries, position and geometry of mandrel, wiper die angle, pressure value of pressure die and bending speed. Bending of different tube materials by trial and error method results manufacturing cost and time increases. In this study, effects of mandrel shank positions and the gap values between the mandrel balls and the tube on the thinning and the ovality are investigated by commercially available PAM-STAMP program for AA6061-W condition material. The results are compared with available results in the literature.
31st International Conference on Metallurgy and Materials, METAL 2022


Effects of cyclic strain hardening on performance of eccentrically braced frames
Balıkçı, Elif Müge; Topkaya, Cem (2021-12-01)
Performance based seismic design (PBSD) procedures have been developed in recent years. Studies conducted in the past revealed that strain hardening ratio (SHR) used in numerical modeling can be influential on the performance of steel structural systems. In this paper, the effects of SHR on the performance assessment of eccentrically braced frame (EBF) buildings were studied by using FEMA P-58 methodology. The numerical model was validated using the pseudo-dynamic test results of the DUAREM structure. Seism...
Effect of annealing on the mechanical properties of pla parts produced by fused filament fabrication
Aydın, Sencer; Özerinç, Sezer; Department of Micro and Nanotechnology (2021-9-01)
Additive manufacturing has become a disruptive technology for the production of load bearing components in a wide range of applications. Fused filament fabrication (FFF) is among the most effective and economical techniques for the printing of polymeric parts. There are numerous thermoplastic materials suitable for FFF. Among these, Polylactic acid (PLA) is a renewable, sustainable and cost-effective alternative. For better utilization of PLA parts produced by FFF, there is a need to understand the structur...
Effect of variable thermal conductivity and viscosity on single phase convective heat transfer in slip flow
KAKAÇ, SADIK; Güvenç Yazıcıoğlu, Almıla; Gozukara, Arif Cem (Springer Science and Business Media LLC, 2011-08-01)
For a variety of fields in which micro-mechanical systems and electronic components are used, fluid flow and heat transfer at the microscale needs to be understood and modeled with an acceptable reliability. In general, models are prepared by making some extensions to the conventional theories by including the scaling effects that become important for microscale. Some of these effects are; axial conduction, viscous dissipation, and rarefaction. In addition to these effects, temperature variable thermal cond...
Effect of Prescribed Boundary Conditions on the Condenser Behavior of Grooved Heat Pipes
Pourabdollah Vardin, Ali; Dursunkaya, Zafer; Department of Mechanical Engineering (2022-2)
Rapid enhancements in electronic microchips bring the need to design and manufacture advanced cooling devices which can operate effectively without external source. Passive heat exchangers like heat pipes can remove a remarkable amount of heat with the help of capillary action. The phase change process in heat pipes, which utilizes the latent heat energy, enables high heat transfer rate over small temperature differences. Although the physics of evaporation in grooved heat pipes is understood, and comparati...
Effect of Heat Treatment on Microstructure and Mechanical Properties of Additively Manufactured 18Ni300 Maraging Steels
Aydın, İbrahim; Yağmur, Aydın; Tirkeş, Süha; Gür, Cemil Hakan (2021-09-01)
Recently, additive manufacturing of maraging steels has gained importance as an alternative to the traditional manufacturing techniques for aerospace components. In this study, various procedures were conducted to find optimum homogenization and aging treatment parameters for 18Ni300 parts that were additively manufactured via Selective Laser Melting (SLM).
Citation Formats
B. Ozcan, Z. Evis, and F. ÖZTÜRK, “Effects Of Mandrel Shank Positions And The Gap Values Between The Mandrel Balls And The Tube On The Thinning And The Ovality İn Rotary Draw Bending,” presented at the 31st International Conference on Metallurgy and Materials, METAL 2022, Brno, Çek Cumhuriyeti, 2022, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/101863.