Although the fasteners are small, they have a great effect. As an important mechanical part of the fastening connection, regular maintenance is required, so that the fastener can play a better performance, safer use and prolong its service life. Improve the performance of mechanical equipment. In order to prevent some problems with the fasteners, we must pay attention to the following points when carrying out the daily maintenance of the fasteners.
1. When the fastener is quenched, the silicate cleaning agent should be used to clean the impurities, and then the rinsing should be carefully carried out to avoid the residual impurities on the fastener, which affects its normal application.
2. After the tempering treatment of the fasteners, there may be signs of discoloration. After the fasteners are soaked in the ether for a period of time, oily substances will be produced. This indicates that the fasteners are not clean enough. . After the analysis, it was known that the stacking was unreasonable when the fastener was heated, resulting in slight oxidation of the fastener in the quenching oil.
3. If there is a white substance on the fastener, it is likely to be some phosphide. The reason for this phenomenon is that the cleaning is not performed using an acid cleaner, and the rinsing tank is not thoroughly inspected.
4, high-strength screw quenching residual heat black with a uniform, flat oil black outer surface. It was detected as caused by alkali burns. Therefore, the steel fasteners cannot remove the surface alkaline substances in the quenching oil, thereby causing the surface to burn at a high temperature and aggravating the damage during tempering. It is recommended to thoroughly clean and rinse the fasteners prior to heat treatment to completely remove alkaline residues that cause burns to the fasteners.
5. For large-size fasteners, it is often quenched with a polymer aqueous solution. Before quenching, it is cleaned and rinsed with an alkaline cleaner. After quenching, the fasteners are rusted on the inside. Therefore, it is necessary to change the rinsing water frequently to ensure that the fastener will not rust during rinsing.
6, high-strength fasteners often see some black stripes, this black stripe is the surface residue of the pollutants, is the quenching oil that is dried, is the evolution of the gas phase during the quenching process. Because the quenching oil is excessively aged, it is recommended to add new oil.
The above problems must be taken seriously, because it will directly affect the performance of the fasteners, and may also lead to shortened service life of the fasteners, resulting in early damage of the fasteners.
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