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The reason for the fracture of the ball mill trunnion
2022-04-14 | Editor:
The ball mill trunnion is a key part of cement machinery. It mainly plays the role of supporting and connecting the cylinder in the whole machine and is the inlet and outlet channel of materials. The shape of the ball mill trunnion is special, and there is an R zone. After the trunnion is finished, it is not allowed to have obvious casting defects - shrinkage holes, slag inclusions, segregation, and cracks. These casting defects are often the main reason for the fracture of the ball mill trunnion.
Ball mill trunnions are generally relatively large steel castings, and some trunnions weigh more than ten tons. Aging treatment should be carried out when machining trunnion blanks, otherwise there will be residual stress concentration. During the operation of the trunnion under the action of cross stress, the stress concentration erupts, which also easily leads to the appearance of cracks.
If the trunnion of segment casting cannot guarantee the quality of welding and post-weld heat treatment, it is easy to produce hardened structure, stress concentration, and micro-cracks.
Great Wall Casting (CHAENG) introduced the casting process simulation technology and improved the casting process of the trunnion of the ball mill, basically eliminating the defects of sand holes and air holes at the neck of the journal, and improving the quality of the trunnion.
1. CHAENG adopts a unique heat treatment technology, which improves the hardness of the mill trunnion and enhances the impact resistance.
2. The ball mill trunnion produced by CHAENG is made of high-strength steel. In the early stage of casting, the professional engineers of CHAENG optimize the process structure of the mill trunnion according to the operation characteristics of the ball mill, which ensures the long-term operation of this part and prolongs the service life of mill trunnions.
3. CHAENG has a team of technical experts, responsible for the company's technology, management, and operation, and has established a scientific and perfect technology, production, and operation management system to effectively ensure product quality and delivery time.
4. Complete quality inspection methods: chemical composition, mechanical property, dimensional check, ultrasonic testing (UT), magnetic particle testing (MT), penetrant test (PT), and X-ray inspection.
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