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Department of Mechanical Engineering

Analysis of a New Process for Continuous Hot Extrusion Utilizing the Theory of Similarity

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in
  • Massivumformung
  • Technologieentwicklung
Cycle of continuous hot extrusion, a-c) Direct extrusion, d-e) Indirect extrusion phase © IUL
Cycle of continuous hot extrusion, a-c) Direct extrusion, d-e) Indirect extrusion phase
Funding

German Research Foundation (DFG)

Project 437724884
Contact Johannes Gebhard M. Sc.

Continuous hot extrusion is the combination of direct and indirect hot extrusion, which enables an uninterrupted profile exit at a constant velocity throughout all stages of the process. The two processes are combined with a valve, which allows the material to flow towards the main extrusion direction and prevents it from flowing in the opposite direction. During the dead-cycle times, the material in the second container can be consumed by indirect extrusion and the profile output is maintained. As there is currently no machine for continuous hot extrusion, the process is modeled using numerical methods and scaled experiments with a model material. The valve can be designed stationary or movable and has an individual influence on the material flow in each case. The movable valve is comparable to a porthole die and causes additional longitudinal weld seams. A stationary valve causes strong mixing of the transverse weld seam. The figure shows the position of the transverse weld seam for one press cycle, including the direct phase (see Figure a–c) and the indirect phase (see Figure d-e).