7 types screw connection7 types screw connection
Screw connection is a process used to connect two thinner parts with through holes on the connected parts. The parts are tightly connected through the threaded connection of bolts and nuts. In order to facilitate the actual operation, there is a certain gap between the screw and the hole. Clearance, simple structure, convenient loading and unloading, is a commonly used connection method in the automotive industry.
According to structural forms, material differences, and functional requirements, there are seven main types of screw connection
1.Standard screw+bolt=sems screw
The bolts and nuts of this structure and the connected parts are independent at the beginning, which facilitates disassembly, and has more flexibility in the selection of bolts and nuts.
This kind of structure is mainly used in areas where there is no space on one side or where it is difficult to install on one side, such as the top cover four-layer board, seat beams and other areas
4.rivet nut + bolt
5.Blind Rivet Nut+Bolt
7.Blind rivet bolt + nut
The main reason is that pull riveting can be applied to finished and semi-finished products, while pressure riveting must be applied to thin plates. After the finished product, it cannot be used. There are fewer limiting factors for pulling riveting in the body assembly process, and the operation is more convenient and the functions are satisfied. The quantity is always more surplus riveting. (Following a detailed introduction to the difference between pull riveting and pressure riveting)
Standard screw connection is not affected by the material, but requires sufficient space on both sides, and is mainly used in large parts such as anti-collision beams.
For projection welding fasteners, which are widely used in steel areas, only one side space is required to meet the requirements, which is convenient for the installation of various components in the final assembly process. With the development of body materials, pressure riveting fasteners and Riveting applications are gradually increasing, but pressure riveting requires more space, while pulling riveting only requires one-sided space, which occupies a particularly important position for pulling riveting in a closed structure or a narrow area under a space.
For the 7 types of screw connectors, they are applied in different areas according to various factors such as function, material, production, space, etc.
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