Quais são as principais funções das buchas de carboneto de tungsténio?

In the operation of moving parts, long-term friction leads to wear and tear on components. When the clearance between the shaft and the hole reaches a certain level due to wear, the parts must be replaced. Therefore, designers initially choose materials with moderate hardness and excellent wear resistance to make bushings or Tungsten Carbide Bushings. This effectively reduces wear between the shaft and the seat. Once the bushings or Tungsten Carbide Bushings wear to a certain extent, they can be replaced, significantly saving the cost of replacing the entire shaft or seat. Typically, Tungsten Carbide Bushings adopt an interference fit with the seat and a clearance fit with the shaft, as wear cannot be completely avoided regardless of the measures taken; the goal is to extend service life as much as possible. Shaft parts, on the other hand, are relatively easy to machine. Some new designers may dislike this design, believing it increases manufacturing costs. However, after a period of use, repairs often require such modifications. Yet, modifications can easily reduce equipment precision, simply because secondary processing cannot guarantee the positional accuracy of the seat hole center.

Furthermore, in applications where the rotational speed is low, radial loads are high, and clearance requirements are stringent (such as camshafts), bushings are often used to replace rolling bearings (in fact, bushings can also be considered a type of sliding bearing). The material for these bushings requires moderate hardness and wear resistance. After the inner bore of the bushing is ground and scraped, it can achieve high fitting precision. Additionally, the inner wall must be equipped with lubricant grooves, as lubrication of the bushing is crucial. Without proper lubrication, the shaft and bushing will quickly fail due to dry friction. During installation, it is recommended to scrape the inner wall of the bushing’s bore, creating numerous small pits that enhance lubrication.

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The selection of Tungsten Carbide Bushings and bushings depends on specific operating conditions, primarily considering factors such as pressure, velocity, the product of pressure and velocity, lubrication status, and load characteristics. Rapid selection and optimization of Tungsten Carbide Bushings are included in automated selection systems.

Tungsten Carbide Bushings can also wrap around valve stems, making them easy to replace once worn. Without Tungsten Carbide Bushings, the entire component would need to be replaced upon wear. Therefore, during design, the hardness of Tungsten Carbide Bushings is typically reduced, making them the wearing part in the friction pair. This not only facilitates machining and reduces replacement costs but also makes them easy to replace. Of course, Tungsten Carbide Bushings also serve a guiding function, albeit as a secondary feature.