2013年8月13日星期二

Division I explain the lift characteristics of the device run-in period


1, wear faster
Since the new machine parts processing, assembly and adjustment factors, the friction surface roughness, the small contact area with the surface, uneven surface pressure conditions. The machine during operation, some parts of the surface irregularities friction fitted to electric pallet trucks other, grinding down to the metal debris, but also as an abrasive, continue to participate in friction, but also accelerated the part mating surface wear. Therefore, run-in period is likely to cause parts (especially the mating surface) of the wear, wear faster. At this time, if the overload operation, it may cause damage to components, resulting in premature failure.
2, poor lubrication
Parts of the new assembly with the gap is small, and of the assembly and other reasons, it is difficult to ensure uniformity with the gap, lubricant (grease) on the friction surface is not easy to form a uniform film, to prevent wear. Thereby reducing the lubrication performance, resulting in abnormal wear of the early parts. Cause serious friction with precision surface scratches or bite phenomenon, leading to failure.
3. Loosening
New processing and assembly of parts, there is geometry and with the size of the deviation, the initial period, due to shock, vibration and alternating load, and heat, deformation and other factors, coupled with excessive wear and other reasons, easy to the original fastening of loose parts.
4, the occurrence of leakage
As loose parts, vibration and heat impact machine, the machine and the sealing surface fitting, etc., there will be leakage; part casting, machining and other defects in the assembly debugging difficult to find, but vibration during operation , shock effect, this flaw is exposed, the performance of leakage (seepage) oil (water). Therefore, the run-in period is prone to leakage.
5, faulty operation and more
Because of the structure of the machine, do not know enough performance (especially the new operator), susceptible to failures caused by operational errors, and even cause mechanical accidents.

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