The ball mill trunnion has a special shape with an R zone. After finishing the trunnion, it is not allowed to have any obvious casting defects including shrinkage cavity, slag inclusion, segregation, and cracks. These casting defects are often the main reason for the fracture of the ball mill trunnion.

Ball mill trunnions are generally large steel castings. Some trunnions can reach more than ten tons per piece. There are often stress concentrations in the castings. The ball mill trunnion blanks should be processed by aging treatment, otherwise, it will cause stress concentration residuals in the trunnions. When the ball mill trunnion is under the action of cross-stress, the stress concentration and explosion can also easily lead to the appearance of cracks.

CHAENG (Xinxiang Great Wall Casting) introduced the casting process simulation technology and improved the casting process of the ball mill trunnion, which basically eliminated the blowhole and air hole defects at the journal and brought the quality of the trunion to a new level.

Ball mill trunnions produced by CHAENG are manufactured with high-strength steel. In the early stage of casting, the professional engineers of CHAENG optimize the process according to the operating characteristics of the ball mill to ensure the long-term stable operation of the mill trunnion. In addition, CHAENG uses unique heat treatment technology to increase the hardness and increase the impact resistance of the ball mill trunnion.