A Cold Bending Machine is used for bending and re-bending tests of reinforcing bars, wire rod and wire for concrete and other applications.
The test piece is bent over a mandrel. The angle of bend and the diameter of the mandrel (D) is selected in accordance with the relevant product standard AS/NZS 4671 Section 7.2.3
For re-bend test, first the test piece is bend with a minimum angle of bend of 90° over a mandrel, in a second step, the aging treatment is applied and than the test pieces bent back up to a minimum of 20° or 90°, according to AS/NZS 4671 Section 7.2.3
After the tests, the tension (lower) side of the test piece is visually inspected for cracks or fissure visible to a person with normal or corrected vision.
Mandrels for bent and re-bend tests should be ordered separately.