1. Raw material problem
The failure of raw materials is mainly due to improper selection of materials and quality problems of the materials themselves. If the sealing material is incompatible with the liquid to be sealed, it will swell, resulting in deformation and failure. Uneven mixing of the rubber compound or inadvertent mixing of impurities during the mixing process, excessive additive content or segregation, pores, porosity, and poor interface between the reinforcing phase and the matrix phase lead to performance degradation. In response to the above situation, the countermeasures are to fully verify the performance of the product when selecting materials, purchase materials from regular manufacturers and do a good job in incoming material control.
2. Installation problems
This problem is typical of rubber seals. On the one hand, it is the problem of compression ratio. If the compression ratio is too large, forcibly pressing in during assembly will cause local deformation of the rubber parts. On the other hand, the surface of the seal is scratched, and foreign objects such as metal chips, sand or cotton yarn are caught. In view of the above situation, the countermeasure is to check the surface quality of the rubber seal before assembly, and there should be no defects such as flash, burr, crack, trimming, air hole, porosity, etc. The geometric size and accuracy of the seal should meet the standard requirements. Check the machining quality, geometric accuracy, surface roughness, etc. of the sealing grooves of the parts. Use appropriate methods to remove groove burrs and sharp corners; check the cleanliness of seals and sealing parts, and clean the seals if necessary; check whether the seals are twisted, scratched, or eccentric after assembly, and the above phenomena should be corrected immediately or re-install.
3. Management issues such as storage and transportation
Improper management of rubber parts in storage and transportation is the main reason for their early failure. In response to the above situation, the measures to be taken are to store the rubber parts according to the instructions of the product, avoid direct sunlight, heat and moisture; do not contact with solvent oil, grease and other solid materials; the storage temperature is generally 0 ℃ ~ 25 ℃ It should not be stored in an environment with acid and alkali; there should be no heavy pressure during storage.
4. Use problems
During use, there may be over-temperature, excessive stress, poor lubrication, and oil contamination. Excessive temperature will lead to the aging of rubber parts and shorten the service life, and the contamination of oil will lead to aging, cracking, expansion and deformation of rubber parts. In response to the above situation, the countermeasures are to monitor the process temperature during use to avoid excessive temperature, check the pollution degree of the oil in time, and reasonably determine the oil change cycle to ensure the performance of the oil.
5. Wear and abrasion
The parts where the rubber parts are used are almost always the friction parts of the product. Since the rubber material is a poor conductor of heat, heat and surface damage are generated during friction, resulting in wear and tear. The abrasion resistance of rubber gets worse as the temperature increases. In view of the above situation, the countermeasure is to ensure that the parts in contact with the rubber parts are as smooth as possible, so that the rubber products do not suffer from wear and tear.
