Design and application requirements of automotive fasteners and clips.
The main function of automobile fasteners is to fasten and connect two or more parts on the car to form an integral part. Fasteners used in automobiles are small parts, but there are many varieties. Basically, the auto fasteners can be divided into two categories: standard and non-standard fasteners. Commonly used types of automotive fasteners include bolts, studs, self-tapping screws, nuts, Rivets, welding studs, washers, etc.
Automobile fasteners are mainly characterized by a wide variety, various types and different specifications. Its selection and use involve structural analysis, connection design, failure and fatigue analysis, corrosion requirements and assembly methods, as well as related product quality. Control and testing, these factors largely determine the final quality and reliability of the automotive nuts and bolts.
In order to improve the quality of the wholesale fasteners for the automotive industry, it is necessary to strictly control the quality of the selected steel and the production process. The chemical composition of the steel used must be strictly controlled to reduce the content of S, P, O, which can cause the fasteners to crack during production. In the process of producing automobile fasteners, in order to improve the product quality of automobile fasteners, we must first adopt advanced production equipment, and secondly select the correct production process to improve the qualified rate of products. When conducting heat treatment of fasteners, the temperature, atmosphere and time in the heating furnace should be strictly controlled to reduce the burning loss and decarburization of the surface of the finished fasteners. Although the automotive fastener manufacturers strictly control the production process, it is still difficult to ensure that the output products are all qualified parts. Therefore, the final sorting and testing are carried out after the production is completed. The sorting can use manual sorting, eddy current sorting, optical sensors, and the like.
With the development of the automobile industry, the requirements for energy saving, lightweight, environmental protection and miniaturization have been continuously enhanced, and auto car fasteners have also received more and more attention. The steel used in the manufacture of automotive fasteners must have good strength and plasticity, and the expected comprehensive properties can be obtained after heat treatment. When heat treatment of fasteners, the temperature, atmosphere and time in the heating furnace should be strictly controlled to reduce the burning loss and decarburization of the surface of the finished fasteners. Heat treatment process is one of the keys to obtain good comprehensive performance of automotive fasteners. Unreasonable heat treatment process will directly lead to the failure of fasteners.
If the structure allows, the hex flange face nuts are preferred. For parts with special anti-loosening requirements, consider the use of torque-efficient lock nuts, such as all-metal lock nuts and non-metal insert lock nuts.