Flat Round Head Rivet

Structural Features of the Flat Round Head Rivet

Head Shape: The head of the flat round head rivet is flat and round, with a relatively flat top and slightly curved edges. This shape enables the rivet to provide a larger bearing area when connecting components, disperse the pressure, and reduce damage to the surface of the connected components. At the same time, it also has a certain aesthetic appeal, making the connected part look relatively flat and smooth.

Shank Structure: It is usually a solid cylindrical shank, similar to the shanks of other types of rivets. The diameter and length of the shank have various specifications according to different usage requirements. Its dimensional accuracy and surface quality have an important impact on the connection performance of the rivet. Generally, the surface of the shank is required to be smooth to ensure that it can be smoothly inserted into the hole of the connected component during the riveting process and closely fit the hole wall.

Material Selection of the Flat Round Head Rivet

Carbon Steel: It has high strength and hardness and can withstand large tensile and shear forces. It is suitable for general industrial applications, such as fields with high requirements for connection strength, like machinery manufacturing and building structures. The flat round head rivets made of carbon steel have a relatively low cost and high cost-performance ratio. However, they have poor corrosion resistance and require appropriate anti-corrosion treatment in some harsh environments.

Stainless Steel: It has excellent corrosion resistance and oxidation resistance and can maintain good performance in corrosive environments such as humid conditions, and those with acids and alkalis. It is often used in industries with strict requirements for corrosion resistance, such as food processing equipment, medical devices, and shipbuilding. Although the cost is relatively high, it can ensure that the rivets will not be corroded during long-term use, thus maintaining the reliability of the connection.

Aluminum Alloy: It is light in weight and has a certain degree of corrosion resistance, and is widely used in fields such as aerospace and electronic equipment manufacturing. In these fields, reducing weight is crucial for improving product performance. At the same time, the flat round head rivets made of aluminum alloy can also meet certain connection strength requirements, and their corrosion resistance can adapt to different working environments.

Manufacturing Process of the Flat Round Head Rivet

Forging: First, heat the selected metal material to an appropriate temperature range, and then process the material into the approximate shape of the flat round head rivet through the forging process. During the forging process, the metal material undergoes plastic deformation under the action of the mold to form the head and the shank. At the same time, the internal structure of the metal becomes denser, and the grains are refined, thus improving the strength and toughness of the rivet.

Machining: Carry out mechanical processing on the forged rivet blank to meet the precise dimensional and surface quality requirements. Through processes such as turning and grinding, precisely process the diameter and thickness of the head, as well as the length and diameter of the shank to ensure that all dimensions of the rivet meet the design standards. At the same time, polish or grind the surface of the rivet to reduce surface roughness and improve surface finish, so that the rivet can fit well with the surface of the connected component after riveting.

Heat Treatment: For some flat round head rivets with high performance requirements, a heat treatment process is required. For example, quenching can improve the hardness and strength of the rivet, and then tempering is used to adjust its toughness to meet the usage requirements under different working conditions. The heat treatment process requires strict control of parameters such as temperature and time to ensure that the rivet obtains stable performance.

Application Fields of the Flat Round Head Rivet

Automobile Manufacturing: In the manufacturing of automobile bodies, flat round head rivets are often used to connect the thin plate components of the body, such as doors, engine hoods, and trunk lids. The design of the flat round head can make the surface of the connected part flat, which not only ensures the appearance quality of the body but also provides reliable connection strength to withstand various stresses during the driving process of the automobile. In addition, flat round head rivets are also widely used in the installation of automobile interior components, such as the connection of seat frames and the fixing of interior panels.

Electronic Equipment: In the production of electronic equipment, flat round head rivets are often used to connect the casings, frames, and some internal structural components of the equipment. For example, in the assembly of laptop computer casings and the manufacturing of server chassis, flat round head rivets can ensure a firm connection while making the appearance of the equipment neat and beautiful. Moreover, since electronic equipment usually requires frequent disassembly, maintenance, and upgrading, the structural characteristics of flat round head rivets facilitate the disassembly operation without causing too much damage to the equipment.

Furniture Manufacturing: In the furniture industry, flat round head rivets can be used to connect components made of different materials such as wood, metal, or plastic. For example, in the connection of the frames of some metal furniture, the fixing of components of panel furniture, and the installation of furniture decorative parts, flat round head rivets all play an important role. The flat round head can be used as a decorative element to increase the aesthetic appeal of the furniture, and at the same time, it provides sufficient connection strength to ensure the structural stability of the furniture.

Aerospace: Flat round head rivets also have certain applications in the structural connection of aircraft. Although the aerospace field has extremely high requirements for the performance of rivets, and usually uses some special rivets made of high-strength and lightweight materials, flat round head rivets are still used in some non-critical structural parts or places with relatively low requirements for connection strength. For example, in the connection of some interior decorative panels and non-load-bearing structural components of the aircraft, flat round head rivets can meet the connection requirements of these parts, and their aesthetic appeal and flatness also meet the strict requirements of the aerospace field for the appearance of products.

Marking Method of the Flat Round Head Rivet

The marking of the flat round head rivet usually includes information such as the product name, nominal diameter, nominal length, material, and surface treatment. For example, the marking "Rivet, Flat Round Head, GB/T xxx - xxxx, 5×25 - Stainless Steel, Passivated" indicates a flat round head rivet with a nominal diameter of 5mm, a nominal length of 25mm, a material of stainless steel, and a surface treatment of passivation. Among them, GB/T xxx - xxxx is the corresponding national standard number, and different types and specifications of flat round head rivets should be marked in accordance with the corresponding standards for easy identification and selection.

Installation Precautions of the Flat Round Head Rivet

Aperture and Hole Depth: When installing the flat round head rivet, the diameter of the installation hole on the connected component should match the nominal diameter of the rivet. Generally, the aperture is slightly larger than the diameter of the shank of the rivet to facilitate the insertion of the rivet. The hole depth should be determined according to the size of the rivet head and the thickness of the connected component to ensure that after riveting, the head of the rivet can closely fit the surface of the connected component, and the shank can be fully deformed to achieve a reliable connection.

Riveting Tools and Pressure: Select appropriate riveting tools according to the material and specifications of the rivet, such as pneumatic riveting machines, hydraulic riveting machines, or manual rivet guns. During the riveting process, accurately control the riveting pressure. If the pressure is too small, the rivet may not be closely combined with the connected component, affecting the connection strength; if the pressure is too large, the head of the rivet may be overly deformed or the shank may break, damaging the connected component or affecting the connection effect.

Verticality and Concentricity: When inserting the rivet into the installation hole, ensure that the axis of the rivet is perpendicular to the surface of the connected component and concentric with the installation hole. This can enable the rivet to be evenly stressed during the riveting process, ensure that the head can fit flatly on the surface of the connected component, and at the same time, make the shank closely fit the hole wall, improving the stability and strength of the connection.