Flow spinning process

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The flow forming process (also known as flow forming process or projection stretch forming ) is a manufacturing process for processing metals . It is a special forming process. The workpiece is formed by the use of rollers with high pressure but low temperature (below the recrystallization temperature , hence also cold rolling ), which results in a high work hardening . With this process, the raw material is used so well that little waste is generated. It is therefore more economical than other methods. A disadvantage is that only products with a small diameter can be manufactured. The purpose of the process is the production of seamless hollow bodies, e.g. B. pipes. Hollow bodies without a seam are particularly stable.

Possible products are, for example, fire extinguishers , cooking pots , lamp posts , but also gun barrels or centrifuges for uranium enrichment , which are used to build nuclear weapons .

Flow spinning machines , a German invention, are required to use the method . Since these machines can not only manufacture products for civil but also military use, they are subject to strict export controls as so-called " dual use " goods .

literature

• Lê van Thiem: A contribution to the determination of the technological guide values ​​for the flow spinning of aluminum and aluminum alloys. Karl-Marx-Stadt 1973 (Karl-Marx-Stadt, Technical University, dissertation, 1973).
• Manfred Luschnitz, Karl Seifert: Flow pressing. Introduction to the process and production examples from practice (= information for mechanical engineering. Vol. 95, ZDB -ID 253271-2 ). Central Institute for Manufacturing Technology in Mechanical Engineering, Karl-Marx-Stadt 1969.

Web links

• Flow spinning machine in the Bauwiki of TU Graz

Individual evidence

1. ↑ Archive link ( Memento of the original from July 24, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  
2. ↑ Dual-Use Regulation of the EU (PDF; 4.5 MB)