On the Friction Test for Metal Forming Applications
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The ring compression test is a conventional test for identifying the friction law for metal forming applications. This test is very widely used but has a significant disadvantage. In particular, if the friction stress is high, then a sticking region occurs over a part of the friction surface. In this case, the interpretation of experimental results is difficult because the friction law at sliding is not valid over the sticking region. If the friction stress is very high, then this region occupies the entire friction surface. In this case, the process becomes insensitive to the friction factor at sliding at all. In order to overcome this difficulty and keep the conventional procedure for identifying the friction law, it is proposed to carry out the compression test between fat and conical dies. The geometry of the conical die should be chosen such that no sticking region occurs on the friction surface.
KeywordsFriction Sticking Metal forming
This work was carried out within the framework of the international project supported by grants RFBR-18-51-76001 (Russia) and BULKSURFACE – 359 (Ministry of education, science and technological development, Serbia).
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