The severe wear (wear) stage of the mechanical seal-

The severe wear (wear) stage of the mechanical seal

　2017-06-09　　

The severe wear (wear) stage of the mechanical seal:

In the severe wear (wear) stage of the container John Crane 502 mechanical seal, due to the surface damage, the surface temperature rises, and the change in the mechanical properties of the material increases the amount of wear drastically. The wear rate increases, which eventually leads to parts failure. At this stage, there is often a change in the form of wear.

Figure 2-41 (a) shows another type of wear process. During the wear process of the metal bellows cartridge mechanical seal, various influencing factors accumulate to shorten the second stage, and there is no obvious boundary between the second and third stages. The wear rate is gradually increasing. Generally, electronic components belong to the former [Figure 2-41(c)1, while mechanical components belong to the latter [Figure 2-41(b)]. Such as valve parts, its wear and tear will eventually lead to leakage.

Figure 2-41(c) shows that the amount of wear of the object increases steadily over time from beginning to end, and there is no limit. The loss rate has been declining throughout the entire process. For example, the parts of tractors, various agricultural machinery and excavators wear faster at the beginning, and the wear rate decreases when the surface is blunt.

The wear process shown in Figure 2-41 (d) is: during the first working period, the friction surface does not wear at all, or the wear does not indicate the change in size, and does not affect the working performance of the parts. . For example, the material of the working surface layer of gears and rolling bearings does not undergo fatigue failure after a certain period of operation. Another example is that some parts with perfect sealing and good lubrication have no wear at the beginning, and only after the working conditions change in the future, the wear will increase. As shown below:

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