An HVOF Process Cement Mill Part Replaced by a NM400 Parts

As a key component of the rotating shaft of the cement mill, the contrarotating ring plays a vital role in preventing large particles of dust from entering the sealing chamber, thereby safeguarding the bearings.

The original process for this cement plant spare parts utilises ST 37-2+HVOF with an HRC of approximately 60.

The contrarotating ring creates friction with another sealing part when the spindle is rotating, which over time accelerates the wear of the surface, leading to a decline in sealing performance. Therefore, the maintenance department of the cement plant needs to replace this part periodically.

Due to the high cost of the contrarotating ring produced by the HVOF process, it is necessary to first accurately machine the ordinary steel plate to an outer diameter of 1200mm, an inner diameter of 1010mm, a thickness of 12mm, and to maintain the surface flatness. These production requirements are very high. Subsequently, tungsten carbide must be sprayed on both sides using high-speed oxy-fuel spraying technology. Finally, the surface roughness of Ra1.6 can be achieved through the processing of a large grinding machine.

The high purchase cost of the HVOF contrarotating ring places significant pressure on the user. Following a technical analysis between our customer and Cafu's technical team, it was decided to replace the original cement plant spare parts with a contrarotating ring made of NM400 wear-resistant steel plate. This is a high-quality wear-resistant steel from China that can be used in a wide range of applications that require resistance to abrasion. It is a good alternative to many composite wear-resistant materials.

Cafu has applied its specialised production process to the manufacture of the contrarotating ring, using high-quality wear-resistant steel plates, which are laser cut, lathed and finely ground, to produce the perfect replacement for the high velocity oxygen fuel (HVOF) technology contrarotating ring. The cost is only about one-third of the original cost, which greatly reduces the maintenance cost and creates a greater value return for our cement plant customers.

Cafu, as a leading supplier of spare parts for cement plants, offers a comprehensive range of wear parts, in addition to providing assistance to customers in improving existing processes. Our mission is to provide the best wear-resistant spare parts solutions for users and their shareholders through the implementation of practical projects.