Reduction in axial forging load by low-frequency torsional oscillation in cold upsetting

• Published in: International journal of advanced manufacturing technology Vol. 93; no. 1-4; pp. 933 - 943
• Main Authors: Matsumoto, Ryo, Kou, Jinkan, Utsunomiya, Hiroshi
• Format: Journal Article
• Language: English
• Published: London Springer London 01.10.2017; Springer Nature B.V
• Subjects: Aluminum; Amplitudes; Angular speed; CAE) and Design; Cold forging; Cold upsetting; Cold working; Computer-Aided Engineering (CAD; Engineering; Industrial and Production Engineering; Mechanical Engineering; Media Management; Original Article; Reduction; Rotation; Torsion; Torsional oscillations; Upsetting; Workpieces; Forging; Stress superposition; Load; Ram motion control; Torsion
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-017-0553-1

Torsional oscillation with a maximum frequency of 1.5 Hz was superposed with axial forging load to reduce the axial forging load in cold upsetting process. A cylindrical aluminum workpiece was twisted by rotating the lower die around the z -axis with a maximum alternating amplitude of 22.5° and a maximum angular speed of 0.5 rpm during cold upsetting process with a maximum compression speed of 0.1 mm/s. The torsional oscillation conditions for the load reduction were determined from theoretical and experimental results. It was found that the axial forging load was reduced by larger than 5% under the following conditions: rotation/compression speeds larger than approximately 15°/mm and torsion amplitudes larger than approximately 1°. A maximum reduction in the axial forging load of approximately 80% was obtained in upsetting with a rotation/compression speed with approximately 1700°/mm.