The effect of the roll-gap shape factor on internal defects in rolling

✍ Scribed by S. Turczyn

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 740 KB
• Volume: 60
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/0924-0136(96)02342-4

✦ Synopsis

One of the main aims of the paper is to update the study on internal defects which can arise during rolling. First part of the work describes an upper-bound model of an appearance and growth of voids. The model refers to both the internal central bursts and the splitting of the ends during rolling. This solution allowed the formulation of an energetic criterion for the appearance of central bursts and splitting of the ends. The second part of the work contains the experimental verification of the model. The results confirmed the correcmess of the assumptions in the model and they agree well with the theoretical predictions. Agreement is particularly observed in the comparison between the measurements and the predictions of the splitting of the ends during rolling of aluminum samples.

Criteria developed in the work, based on the minimum power requirement in rolling, show increased probability of the appearance of central bursts and split ends during rolling of products with the large relative thickness when small reductions are applied. The dangerous range of rolling parameters begins when the roll-gap shape factor exceeds 0.75-0.79.