The burning loss of the plastic thrust tile is essentially caused by the failure of the oil film. There are five main factors contributing to this issue: the quality of pump installation, the manufacturing quality of the pump, excessive bearing capacity, unsuitable operating conditions, and the quality of the plastic thrust tile itself.
The adjustment force of the anti-heavy bolt on the thrust tile appears to be insufficient, resulting in a large adjustment range and increased disk force. It feels as though the tile surface is too soft and lacks adequate hardness. After the manufacturer confirmed that the grinding amount on the Wawa surface of the plastic thrust tile was minimal and the finish was inadequate, it became clear that even after failure, the PTFE layer remained approximately 2.0mm thick—well above the required 1.5mm. Some tiles show minor machining marks around 1.5mm wide during installation, but this issue persists with new plastic thrust tiles as well. When adjusting the unit level using a rubber injection molding machine, the adjustment force is clearly excessive.
The entire burning process occurs as follows: the plastic thrust tile suffers from poor quality, leading to a gradual temperature rise. Once the PTFE surface reaches 232°C or higher, the solder begins to melt and flow. The molten solder enters the lubricating oil and a small portion is carried into the thrust end of the tile. Most of it deposits on the oil inlet side. A small part mixes with the lubricating oil and flows toward the thrust head mirror plate along with the oil. This oil forms a thin film, which reduces direct friction, but the incoming solder accelerates wear on the PTFE surface. As the plastic degrades the oil, a vicious cycle is created, further increasing the temperature. Since only a small amount of oil is present during this process, the plastic thrust tile surface remains soft and, if shut down in time, maintains a relatively smooth appearance without visible scratches or burn marks.
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