What is the wear process of the diesel generator engine parts? How to reduce wear?
In the four common failure modes of diesel engine parts and generator engine parts, the wear of engine parts is the most common. According to relevant statistics, more than 80% of the failures of engine parts are due to wear. Therefore, it is very important to understand the wear process of parts and to be familiar with methods and approaches to prevent or reduce the wear of parts.
The normal wear process of mechanical parts is generally divided into three stages, as shown in the following figure. The curve representing the wear process is called the wear curve. Due to the different types of wear and working conditions, different parts have different wear patterns, but their wear patterns are the same.
Typical wear process
1 . Running-in phase (I phase)
The O1A section shown in the figure above is also called the run-in phase. The new friction surface has a certain surface roughness. Under the action of the load, due to the small actual contact area, the contact stress is large. Therefore, at the initial stage of operation, the plastic deformation and wear of the surface are faster. As the running-in progresses, the rough surface of the friction surface gradually wears off, the actual contact area gradually increases, the surface stress decreases, and the wear slows down. As the curve approaches point A, the gap increases to S0.
Slight wear of the running-in stage creates conditions for normal operation and stable operation. The break-in period can be shortened by selecting a reasonable running-in procedure, using appropriate frictional auxiliary materials and reasonable processing techniques, properly assembling and adjusting, and using a lubricant containing active additives.
2 . Stable wear stage (Phase II)
As shown in the above figure, the AB section. After running-in, the friction surface undergoes work hardening and the micro geometry changes, establishing elasto-plastic contact conditions. At this stage, the wear tends to be stable and slow, and the working time can be extended for a long time. Its characteristic is that the amount of wear increases in proportion to time, and the gap slowly increases to Smax.
3 . Abrupt wear phase (phase III)
As shown above, the middle point of curve B is right. After point B, due to large changes in the friction conditions, such as rapid increase in temperature, metal structure changes, so that the gap s becomes too large, increase the impact, the lubricant film is easy to destroy, the wear rate increases rapidly, resulting in diesel generators The group's efficiency is reduced, accuracy is reduced, abnormal noise and vibrations occur, and eventually an accident is caused.
The significance of mastering the wear law is as follows:
First, understand that the parts are generally working in a stable wear stage. Once it is transferred to the sharp wear stage, the parts must be repaired or replaced. The normal working time t between the two repairs can be calculated by the following formula (above):
Tana = BD/AD (Smax-S0)/t
t=(Smax-S0)/tana
In the formula, tana is the wear intensity.
Second, the wear process consists of natural (normal) wear and accidents (premature, rapid growth, or sudden accidental wear). Natural wear is unavoidable and accidental wear can be delayed or even avoided. Our task is to take measures to reduce the degree of wear, shorten the running time as much as possible, increase the normal working hours, and extend the service life.
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Shanghai Ito Power Co., Ltd. Main : Ito Gasoline Generator , Ito Diesel Generator , Ito Small Pump , Ito Digital Generator , Ito Electric Welding Machine
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