- Aug 08, 2018-

Roller is also called roller, refers to the machine can be rolling cylindrical parts collectively. After using about D, the roller has its own rupture at about 260mm of the shaft head, the sound is very large when breaking, and the fracture shaft head collapses nearly 1 m. The roller belongs to the variable cross-section axis, the maximum diameter is 545mm, the total length is 2 296 mm, the material grade 40Cr, after forging, coarse car, quenching and tempering heat treatment and precision vehicle and other processes.