Abstract
The three-high screw rolling of AISI 321 billet from 60 mm to 52 mm diameter was performed using an MISIS-100T mill. When screw rolling was carried out, a set of sections were made in the billet’s cross-section at the stationary stage of screw rolling. SolidWorks was applied to make the 3D model of the rolled billet’s grain using microstructure images. The same technique was applied for the creation of the 3D model of a nondeformed billet’s grain. A comparison of the 3D models’ shape and dimensions before and after screw rolling was made. It was established that, compared to the nondeformed grain model, the screw rolled billet’s grain model was twisted and elongated along some angle in the rolling direction. This angle’s value is commensurable to the roll’s feed angle during the experimental rolling. Anisotropy indexes of before and after rolling grain models were estimated and compared to the anisotropy indexes obtained via the sections’ analysis in earlier research. Difference did not exceed 5%.
Highlights
Academic Editor: Screw rolling is applied for manufacturing round bars, hollow tube shells and seamless tubes
The objective of this research was the development of a technique for the creation of a 3D model of AISI 321 steel billet’s grain before and after three-high screw rolling
The 3D models presented in Figures 6–8 allowed to conclude that there is twisting of the grain near the billet surface areas
Summary
Academic Editor: Screw rolling is applied for manufacturing round bars, hollow tube shells and seamless tubes. Two-high rolling mills are mainly used for producing hollow tube shells by screw piercing [1,2,3,4,5,6,7,8]. Three-high screw piercing is used for the same purpose [8,9,10]. Three-high screw rolling is applied for manufacturing round bars [11,12,13,14]. It can be noticed that, during screw rolling, the material forming process is complex in character [15]. The microstructure is often investigated and estimated while screw rolling
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