How HPGR Studs Are Mounted on Rollers？

One of the core components of the High Pressure Grinding Rolls, a widely used comminution technology in the modern ore processing, cement and metallurgical industries, is the tungsten carbide stud. The role of the studs is to protect the roll surface against extreme high pressure and strong abrasion, and to extend the service life of the equipment.

The common installation methods for HPGR studs are interference fit and brazing.

The interference fit (press fit / hot/cold expansion fit) is by far the most common and reliable installation method.

The diameter of the stud is slightly larger than the diameter of the hole in the roll face, and a mechanically tight fit is achieved by heating the roll (to expand the hole) or cooling the stud (to shrink it). This method of installing the studs is firmly fixed, not easy to loosen, and does not require glue or welding materials. Strong resistance to impact and vibration. Suitable for high abrasion, high load mining crushing scene.

Brazing is used to firmly bond the studs to the roll surface by melting the brazing alloy at a high temperature. The peripheral sealing is good, effectively preventing corrosion, and is suitable for customized roll faces for special working conditions. The disadvantage is that the high temperature process may affect the performance of tungsten carbide, and the process is complicated and costly.

In the design of the roll surface structure, it is necessary to consider the size and shape of the studs (such as cylindrical, spherical top), the tolerance of the hole diameter and machining accuracy, the material of the roll core (generally high-strength alloy steel or cast steel), and the matching of the coefficient of thermal expansion. For specific size and shape requirements, you can contact Jinxin to help you decide the program.