What is seal failure in precision mechanical part machining?
Release date:
2023-03-29
Anyone skilled in the machining of precision mechanical components is well aware of what a mechanical seal is—often referred to as a face seal. This sealing method is primarily used to replace conventional axial seals, which are prone to leakage, with face seals that are much less likely to leak. Simply put, it is an axial sealing device for rotating machinery.
What does it mean when precision mechanical parts experience sealing failure?
Precision machining involves cutting materials according to production requirements; some small components resulting from this process can be manufactured using punch presses, milling machines, or CNC machining.
Anyone skilled in the machining of precision mechanical components is well aware of what a mechanical seal is—often referred to as a face seal. This sealing method is primarily used to replace conventional axial seals, which are prone to leakage, with a more reliable face seal. Simply put, it is an axial sealing device for rotating machinery. A mechanical seal prevents fluid leakage by relying on the combined action of fluid pressure, the elastic force (or magnetic force) of a compensation mechanism, and auxiliary seals, thereby stopping leakage across at least one pair of end faces perpendicular to the shaft axis. It is widely employed to seal the shafts of pumps, reactors, compressors, and similar equipment.
In the machining of precision mechanical components, a mechanical seal typically consists of a rotating ring, a stationary ring, a compression element, and a sealing element. The rotating and stationary rings are tightly fitted together to form a sealing interface; the rotating ring rotates with the pump shaft, preventing leakage of the process fluid. The rings rely on the pressure of the fluid within the sealing chamber, so their end faces are pressed against the end face of the stationary ring. The sealing function is achieved by generating an appropriate specific pressure on the end faces of both rings and maintaining a thin liquid film.
Machining serves to seal the gap between the rotating ring and the shaft, as well as the gap between the stationary ring and the gland. Meanwhile, the elastic element provides cushioning against pump vibration and impact, while the compression element generates pressure to keep the pump’s sealing faces in a non‑working condition, thereby preventing leakage of the sealing medium and guarding against the ingress of contaminants into the sealing faces.
The proper operation of a mechanical seal is closely linked to its intrinsic performance and external operating conditions. In practice, the mechanical seal is integrated with other pump components; however, it is essential first to ensure the machining accuracy of its precision parts and to meet the technical requirements for auxiliary sealing elements and installation. Only then can the mechanical seal function as intended.
In the machining of precision mechanical components, faults such as vibration and overheating of mechanical seals can lead to roughness on the sealing faces. When the equipment is in operation, if the clearance between the rotating and stationary rings and the seal chamber becomes too small, vibrations and impacts from runout may occur. Additionally, poor corrosion resistance or heat resistance of the sealing faces, inadequate cooling during installation, or the presence of particulate contaminants on the faces can also cause vibration and overheating in mechanical seals. During operation, rotating equipment components may fail, resulting in wear, thermal cracking, deformation, and damage to the sealing faces. Over prolonged use, springs may loosen, fracture, or corrode, while auxiliary sealing rings may crack, twist, deform, or break.
That concludes our explanation of “What does seal failure in precision mechanical part machining mean?” Did everyone understand? We hope this information was helpful. Thank you for watching, and see you next time.
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