Release time：2020-01-16 18:44 Browse：
In the field of machinery and engineering, the outer hexagonal screws are used as the basic components for connection and fastening, and their performance and life directly affect the stability and safety of the entire structure. Extending the service life of the outer hexagonal screws is not only related to cost savings, but also the key to ensuring the long-term stable operation of the equipment. Below, we will explore how to effectively extend the service life of outer hexagonal screws from the aspects of material selection, installation, maintenance and so on.
1. Reasonable selection of materials
**1. Material selection **
The material of the outer hexagonal screw directly affects its strength, corrosion resistance and fatigue resistance. Commonly used materials include stainless steel, carbon steel, alloy steel and so on. Stainless steel screws because of their good corrosion resistance, suitable for humid, corrosive environment; The cost of carbon steel screws is relatively low, but the surface treatment is needed to enhance the anti-corrosion ability; Alloy steel combines high strength with certain corrosion resistance, which is suitable for occasions with high performance requirements. Choosing the right material according to the specific application scenario is the first step to extend the life of the screw.
**2. Surface treatment **
Surface treatment of screws, such as zinc plating, chromium plating, dacromet treatment, etc., can significantly improve the corrosion resistance and wear resistance of screws. These treatment layers can effectively isolate the erosion of air, moisture and corrosive substances on the screw substrate, reducing the strength loss and fracture risk caused by corrosion.
2, correct installation
**1. Preload control **
When installing, it is very important to reasonably control the pre-tightening force of the screws. The preload force is too small, which may cause the connection to loosen. Excessive preloading force may cause excessive stress on screws or connectors and accelerate fatigue damage. Using tools such as torque wrenches to precisely control the preload according to the design requirements is an effective way to ensure a solid connection and extend the life of the screws.
**2. Lubrication and locking **
Applying the appropriate amount of lubricant between the threads can not only reduce the friction resistance during installation, reduce thread wear, but also provide a certain lubrication effect during the working process of the screw and reduce the loosening caused by vibration, impact and other factors. In addition, for important or easily loosened connection parts, locking washers, pre-tightening nuts and other anti-loosening devices can be used to further ensure the reliability of the connection.
3. Daily maintenance and inspection
**1. Check regularly **
Check the outer hexagonal screws on the equipment regularly to see if there are loosening, corrosion, cracks and other phenomena. Solve problems in time to prevent small problems from developing into major problems, affecting the overall performance of the equipment.
**2. Cleaning and maintenance **
Keep the screws and their connecting parts clean, and regularly remove surface dirt, oil stains and corrosion products. For corrosion-prone environments, maintenance work such as rust removal and painting can be carried out regularly to delay the corrosion process.
**3. Replace ** in time
Even the best quality screws will gradually fail due to fatigue, wear and other reasons during long-term use. Therefore, according to the operation of the equipment and the service life prediction of the screws, timely replacement of the aging screws is a necessary measure to ensure the safe operation of the equipment.
4, optimize the design and use conditions
**1. Optimized design **
In the product design stage, fully consider the use conditions and stress conditions of the outer hexagonal screws, and adopt reasonable structural design to reduce stress concentration and improve connection strength. At the same time, choose the appropriate size and grade to ensure that the screws can meet the requirements of use, but not too wasteful.
**2. Improve conditions of use **
Minimize the alternating load and impact load borne by screws, and avoid use in extreme temperature, humidity or corrosive environments. For special environments, you can choose screws of special materials or take additional protective measures.
### Conclusion
Extending the service life of outer hexagonal screws is a systematic project, which needs comprehensive consideration from many aspects such as material selection, installation, maintenance and design optimization. Through scientific and reasonable methods, we can effectively reduce equipment failures and safety accidents caused by screw failure, and improve the reliability and economic benefits of equipment. In the future engineering practice, we should continue to explore and innovate, and constantly optimize the use of outer hexagonal screws and maintenance strategies, and contribute more to the development of mechanical and engineering fields.
# Lengthening outer hex screw # Extra-long outer hex screw # lengthening extra-long outer hex screw # outer hex screw
