Fasteners are elements used to connect and fasten parts, and are very common mechanical parts used for fastening and application. Its shadow can be seen on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and electrical appliances. It has a variety of specifications, different characteristics and uses, and a high degree of standardization, serialization, and generalization. There are many kinds of fasteners, which are mainly divided into twelve categories, each of which is: bolts, studs, screws, nuts, self-tapping screws, wood screws, washers, pins, assemblies and connecting sub-assemblies, rivets, welding nails , Wire threaded sleeve. Each category has its own unique function in each field. As one of the commodities with the largest import and export volume in China, fasteners fully comply with international standards, which promotes Chinese fastener companies to face the world and promotes fastener companies to fully participate in international cooperation and competition. In order to use the fasteners better, we must maintain the fasteners in time. So when we clean fasteners we often find six common problems with some of the key issues.
1. Contamination at the time. After the fasteners are quenched, they are cleaned with a silicate cleaner and then rinsed. Solid matter on the surface caused by silicate residue on the fastener surface due to incomplete flushing. 2. The stacking of fasteners is unscientific. The fasteners show signs of discoloration after tempering, indicating that the fasteners were contaminated with cleaning agents and quenching oils during the flushing process. The analysis results of the quenching oil confirmed that due to the unscientific stacking of the fasteners during the heating process, the fasteners contained slight oxidation in the quenching oil, which was almost negligible. This situation is related to the cleaning process, not the quench oil.
3. The tank liquid should be poured out regularly, and the concentration level of the lye in the rinse tank should be checked frequently.
4, caustic soda injury. Alkaline cleaners contain fluoride and calcium compounds that can burn through steel fasteners during heat treatment and leave spots on the fastener surface. Thorough cleaning and flushing of fasteners prior to heat treatment is recommended to completely remove some of the alkaline residues that cause fastener burns.
5. Improper flushing may promote corrosion. It is recommended to change the rinse water frequently. In addition, adding a rust inhibitor to the water is also a good method.
6. Too much rust. If the quench oil is excessively aged, it is recommended to drain the old oil and add new oil for process supervision and quench oil maintenance throughout the process cycle.
Post time: Dec-09-2022