Self drilling rock bolt combines drilling, grouting and anchoring together. It ensures the anchoring effect in complex ground conditions, including soft rock, soil layer and fault zone, etc. It’s reliable, efficient and simple. Self drilling rock bolt focuses on the flexible supporting system close to the rock surface to play its own strength, suppress deformation and restore stress state of the surrounding rock.
Rock bolt is one of important supporting materials in preventing roof fall in mining project, its quality relates directly to safety production.

When processing the thread of rock bolt, thread-rolling machine is the main equipment. The thread quality has improved largely than primary pipe threader, thread surface is smooth and tensile strength is improved.

Rolling pressure can not only influence quality of thread, but also influence precision and lifetime of equipment. If rolling pressure is small, the pitch diameter of thread will big and outer diameter is small, thread form is not full and tensile strength will decrease; if rolling pressure is big, thread and thread-rolling machine will have defect and loss.
Choosing appropriate rolling time should depend on several factors, such as rolling pressure, material’s physical property, size and shape, etc.