Research of Three-High Screw Rolling of Aluminum Billets with Copper Inserts at Different Rolls Feed Angles

Abstract

Three-high screw-rolling of aluminum alloy ingots was carried out at 12- and 20-degrees rolls feed angles. The ingots had two copper, cylindrical inserts oriented along the ingot axis: the center of one insert coincided with the ingot’s center, and the center of the other insert coincided with the ingot’s half-radius. The effect of the rolls feed angle value on the aluminum and copper microstructure as well as the hardness formation was established. X-ray study and three-dimensional modeling allowed the copper insert twisting angle to be estimated along the rolled billet axis. It also allowed detection of the number of breaks of the insert located in the ingot’s center and the insert located in the ingot’s half-radius depending on the rolls feed angle value.

Modeling the Evolution of Casting Defect Closure in Ingots through Radial Shear Rolling Processing

“…It also can be seen that defect shape-changing is not simple and generally corresponds to Figure 3, which characterizes the moving directions of the metal particles. Also, it can be compared with the results of work [60]. The helical shape of the defect in the Ø17 bar can be clearly seen.…”

“…Based on these sections, a 3D model of the defect was created, allowing us to visualize the shape evolution stage and determine the volume change. X-ray tomography methods were not used due to the low spatial resolution of most X-ray tomographs, which are limited by low accuracy-more than 1 mm [60,61]. This is especially important since a very complex defect shape is expected.…”