Abstract
The article presents the issue of material fracture during the process of cross-wedge rolling (CWR). The object of the research was the process of forming a harrow tooth preform. In the conducted analysis nine damage criteria were applied. The critical value of damage was determined with a new calibrating test, basing on rotational compression of a sample in a channel. The results of calculations were compared to the results of experimental testing performed in laboratory conditions in Lublin University of Technology. On the basis of the obtained results an assessment of the applied damage criteria and their applicability in the analysis of CWR processes was conducted.
Highlights
Cross-wedge rolling (CWR) is an innovative manufacturing technology, applied in the manufacturing of stepped shafts and axles as well as preforms for die forging
Cross-wedge rolling has been used in the industry for c.a. 50 years and since has been developed in terms of theory and manufacturing technology
According to the results published by Yang et al [21] ductile fracture may occur in elements
Summary
Cross-wedge rolling (CWR) is an innovative manufacturing technology, applied in the manufacturing of stepped shafts and axles as well as preforms for die forging. Tests [18,19], based on tension, compression and torsion cannot be employed in a CWR analysis due aforementioned test material cracking occurs in the axial area of the sample due to the occurrence of to significant differences in between the stress state of the test and the real process. For this reason a the the Mannesmann effect [20].
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