Power fittings play an important role in the power system, they are used to connect, secure and protect power equipment. Due to the complex working environment and strict requirements, power metal forgings need to have high strength and fatigue resistance. In order to meet these requirements, it is very important to understand the fatigue life and its influencing factors of electric power tool forgings and take effective strengthening measures. In this paper, the fatigue life of power fixture forgings will be deeply discussed.
As an important part of power system, the quality and performance of power fixture forgings directly affect the safe and stable operation of power system. Fatigue life is one of the important mechanical properties of electric metalwork forgings, which refers to the number of stress cycles before the fatigue fracture occurs under the action of alternating stress. The length of fatigue life directly affects the service life and safety of electric power tool forgings. Therefore, it is very important to understand the fatigue life and its influencing factors of power fixture forgings and take effective strengthening measures.
Influencing factors of fatigue life
Material composition and structure
Material composition and structure are the main factors that affect the fatigue life of power metal forgings. The fatigue life of different materials varies greatly, and in general, the fatigue life of high-strength materials is longer. In addition, the structure of the material also affects the fatigue life, and the fine grain structure has a higher fatigue life.
Stress concentration
Stress concentration refers to the phenomenon of local stress increase on the surface or inside the material due to geometric shapes, defects and other reasons. The stress concentration will make the material more prone to fatigue fracture under the action of alternating stress, thus shortening the fatigue life. Therefore, reducing stress concentration is one of the important measures to improve the fatigue life of electric power tool forgings.
Working environment
The working environment of power fixture forgings will also affect its fatigue life. For example, high temperature, low temperature, corrosion and other environmental factors will cause the performance of the material to decline, thereby shortening the fatigue life. Therefore, according to the different working environment, it is necessary to take corresponding protective measures to improve the fatigue life of power fixture forgings.
Strengthening measure
Heat treatment strengthening
Heat treatment strengthening is an effective strengthening measure, which can improve the fatigue life by changing the structure and properties of materials. For example, the use of quenching + tempering heat treatment process can obtain fine grain structure and higher strength, improve fatigue life. In addition, surface strengthening treatment can also improve the structure and properties of the material surface, thereby increasing the fatigue life.
Optimal design
The optimized design can reduce the stress concentration and thus increase the fatigue life of the power tool forgings. For example, design measures such as rounded corner transitions and avoiding sharp corners can reduce stress concentration. In addition, reasonable material selection and structural design can also improve the overall performance of the material, thus extending the fatigue life.
Surface coating technology
The surface coating technology can form a protective layer with excellent properties on the surface of the material, so as to improve the fatigue life of the power tool forgings. For example, the use of wear-resistant, corrosion resistant, oxidation resistant coating materials can protect the base material from the erosion of environmental factors and extend the fatigue life.
A series of experiments have been carried out to study the fatigue life and its influencing factors of electric power tool forgings. In the experiment, the metal forgings of different materials and heat treatment processes were used, and the stress concentration test and fatigue life test were carried out. The experimental results show that the material composition and microstructure have important effects on the fatigue life, and the high-strength materials and fine-grain microstructure have higher fatigue life. Stress concentration can significantly shorten the fatigue life, and the optimal design can effectively reduce the stress concentration. Surface coating technology can improve the wear resistance, corrosion resistance and oxidation resistance of the material, thereby extending the fatigue life.
In this paper, the fatigue life and its influencing factors of power fixture forgings are studied, and a series of strengthening measures are put forward. The experimental results show that the fatigue life of power metal forgings can be affected by material composition, structure, stress concentration and working environment. In order to prolong the fatigue life, measures such as heat treatment strengthening, optimization design and surface coating technology can be taken. The future research direction includes further improving the strengthening measures of electric tool forgings, improving their anti-fatigue properties, and further studying the fatigue life of electric tool forgings under different working environments and its influencing factors.
