1) Long Edges: In rolling of steels if the rolls deflect in concave way the edges of the sheet will be elongated to a greater extent in longitudinal direction than the center which cause the metal sheet has long edges.
2) Edges Buckles: If the edges are free to move relative to the center, the center portion at the sheet are stretched in tension and edges are compressed in rolling direction this results in an widely edge.
3) Zipper Breaks: Long edge may also result in short cracks in the center which is called zipper breaks.
4) Center Buckles: This problem may be minimized by making the role parallel to the axis. When the center of the sheet is more elongated more than the edge. The center portion is in compression and edge intention. Such a sheet usually content center buckles. Mild shape problem may be corrected by stretch rolling. Stretch leveling the sheet in a roller leveler.
5) Edge Cracking: During rolling elements across the width have some tendency to explain laterally. This tendency is higher at the edge and lower at the center. In this carrier and in homogeneity occurs in homogeneity in stress distribution occurs along the thickness which need to edge cracking.
6) Center Cracking: Under savvier condition of low uniform stress distribution center speed may occur.
7) Alligatoring: In heavy reduction center tends to expands more than the surface with this type of deformation grates speed occurs to the center than the surface, So the surface are placed in tension and center is in compression. If there is any metallurgical witness along the center line of the slag fracture will occurs along the thickness, this is called alligatoring. Edge cracking is minimize by employing vertical edge roles.
2) Edges Buckles: If the edges are free to move relative to the center, the center portion at the sheet are stretched in tension and edges are compressed in rolling direction this results in an widely edge.
3) Zipper Breaks: Long edge may also result in short cracks in the center which is called zipper breaks.
4) Center Buckles: This problem may be minimized by making the role parallel to the axis. When the center of the sheet is more elongated more than the edge. The center portion is in compression and edge intention. Such a sheet usually content center buckles. Mild shape problem may be corrected by stretch rolling. Stretch leveling the sheet in a roller leveler.
5) Edge Cracking: During rolling elements across the width have some tendency to explain laterally. This tendency is higher at the edge and lower at the center. In this carrier and in homogeneity occurs in homogeneity in stress distribution occurs along the thickness which need to edge cracking.
6) Center Cracking: Under savvier condition of low uniform stress distribution center speed may occur.
7) Alligatoring: In heavy reduction center tends to expands more than the surface with this type of deformation grates speed occurs to the center than the surface, So the surface are placed in tension and center is in compression. If there is any metallurgical witness along the center line of the slag fracture will occurs along the thickness, this is called alligatoring. Edge cracking is minimize by employing vertical edge roles.
No comments:
Post a Comment