For a long time, automobile fasteners have been dominated by the basic characteristics of a wide range of varieties, types and specifications. The selection and use of automobile fasteners involves structural analysis, connection design, failure and fatigue analysis, corrosion requirements and assembly methods. , And related product quality control and testing. These factors largely determine the final quality and reliability of automotive products. Automobile fastener processing technology is constantly evolving.

Coupled with the wide distribution of automobile fasteners in various system components of vehicles, the mass production characteristics of automobiles, many companies are facing a higher risk of quality defects, which puts forward a higher level of quality management and standardization work for companies.

1. Overview of automobile fasteners

Due to the wide variety of technologies involved in automobile fastener products, which are extremely complex, and various technologies are intertwined and affect each other, comprehensive research and in-depth analysis, combing and accurate identification must be carried out to determine specific key technical fields, and clear details. According to the development goals and priorities of the technology, it will form a good situation for focusing on the advantages of resources and focusing on key problems, and accelerating the promotion of core technologies.

According to the service conditions of ISO898-1 and GB/T3098.1 standard high-strength bolts, the mechanical properties of automobile fasteners generally have the following requirements:

automobile fasteners

①automobile fasteners need to have high tensile strength and high yield ratio;

②Sufficiently high plasticity, especially when tightening with plastic zone;

③automobile fasteners can be tightened repeatedly, that is, they can withstand large stress amplitude loads enough times and have good low-cycle fatigue performance;

④ When automobile fasteners are subjected to alternating loads, they should have good high-cycle fatigue performance;

⑤ When automobile fasteners are subjected to impact loads, they should have higher impact toughness;

⑥Good delayed fracture resistance;

⑦Good low temperature resistance;

⑧automobile fasteners need to have good creep resistance and stress relaxation resistance;

⑨Lower notch sensitivity (bolt system with multiple notch parts);

⑩automobile fasteners need to have a stable surface friction coefficient to obtain a stable assembly pre-tightening force. 

The fundamental function of automobile fasteners is "connection." Riveting and threaded connection are the most important connection methods so far, and they have always been the mainstream.

2. The development of automobile fasteners

Threaded connection is a complex connection method. Its mechanism is still being explored and researched. The main theories and application methods involved in it are still the theoretical classics of the European VDI2230 in the last century. Without these theories, threaded connections in the world Technology will still linger at the level it was decades ago.

In addition, research on new materials, plastic forming and other theories and technologies has laid a solid foundation for the manufacture of automobile fasteners, which is dominated by cold forming, which is widely used today.

China has the world’s highest automotive output and market. There are more than 100 major manufacturers of automobile fasteners, representing the highest level of automobile fastener manufacturing in China. High-efficiency, high-speed, and highly automated manufacturing processes are inseparable from fundamentals.

The selection and use of automobile fasteners involves many aspects. These basic theories and technologies have given new connotations to the innovation of automobile fastener products, manufacturing technologies and equipment. It shows that any basic theories and technologies cannot be developed or stagnated. Automobile fastener processing technology will definitely have new breakthroughs.