Results 181 to 190 of about 727 (223)
Rotary-draw-bending using tools with reduced geometries
Procedia Manufacturing, 2018 Abstract The tool sets of rotary-draw-bending are designed according to the geometries of the semi-finished product and the desired bending geometries. For more flexibility, the geometries of the tools must be simplified. Based on the distributions of contact normal stresses determined in finite element simulations, a method to simplify the tools ...
Bernd Engel
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In-process measurement of springback in tube rotary draw bending
The International Journal of Advanced Manufacturing Technology, 2021Rotary draw bending of tubes allows repeatable and accurate manufacturing with narrow bending radii and high production rates, thanks to modern CNC controlled electrical machines. However, springback still represents one the main issues especially in small production batches or when the geometrical and mechanical properties of the raw profiles are not ...
Enrico Simonetto +2 more
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Bending behaviors of large diameter thin-walled CP-Ti tube in rotary draw bending
Progress in Natural Science: Materials International, 2011 AbstractThe rotary draw bending(RDB) of large diameter thin-walled (LDTW) tube needs the strict cooperation of multiple processing parameters to avoid possible multiple defects. Due to the specific properties, the bending behaviors of LDTW commercial pure titanium (CP-Ti) tube are much more complex to achieve precise deformation. With the CP-Ti tube of
He Yang, Heng Li
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Optimizing the Rotary Draw Tube Bending Process to Avoid Wrinkles
International Journal of Modelling and Simulation, 2008AbstractLarge metal deformation and highly nonlinear contact conditions arise during tube bending. Instability conditions like wrinkling and tearing persist in the problem. With the advancement of computational facilities and numerical methods like finite element methods (FEMs), it became viable to model these nonlinearities and instabilities inside ...
exaly +2 more sources
Dynamic Detection of Instability Defects in tube Rotary Draw Bending
Procedia Manufacturing, 2017 Abstract Tube rotary draw bending is commonly used to manufacture complex shaped elements in a wide range of geometries and applications. When thin-walled tubes are formed with small bending radii, the components may suffer of wrinkling at the intrados due to the critical process parameters.
Enrico Simonetto +2 more
exaly +3 more sources
In situ detection and control of wrinkle formation during rotary draw bending
Procedia Manufacturing, 2020 Abstract Rotary draw bending (RDB) is a profile bending process which is preferably used for small wall thicknesses and small bending radii. The limits of the process are cracking on the outside of the arch and wrinkle formation on the inside of the arch. Cracking is predicted by comparing the calculated strains with a forming limit curve.
Linda Borchmann, Peter Frohn-Sörensen
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Insights on tube rotary draw bending with superimposed localized thermal field
CIRP Journal of Manufacturing Science and Technology, 2021Abstract The manufacturing of hollow section profiles using high strength metallic alloys may suffer of relevant drawbacks such as springback, reduced formability as well as wrinkling, which often limit the process capabilities. Localized heating of cross section sectors may allow a significant reduction of these issues thanks to the neutral layer ...
Ghiotti A., Simonetto E., Bruschi S.
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A study on mandrel role in rotary draw bending of rectangular tube
International Journal of Materials and Product Technology, 2015The mandrel die with cores is a significant factor affecting the forming quality of rectangular tube in rotary draw bending process. A new mandrel die is designed and manufactured, and the analytical formulas for the geometric parameters are deduced quickly and reasonably.
Kuanxin Liu, Yuli Liu, He Yang
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Effect of mandrel position on bending quality in the rotary draw bending process
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and ApplicationsThe mandrel plays a critical role in supporting tubes within the bending region during tube bending operations. This research explores the impact of varying mandrel positions on bending quality. Therefore, both experimental and finite element analyses were conducted for five different mandrel positions.
Bahadır Ozcan +2 more
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