Rough Countersunk Head Rivet

The rough countersunk head rivet is another common type of rivet. The following is a detailed introduction to the rough countersunk head rivet:

Structural Features of the Rough Countersunk Head Rivet

Head Shape: The head of the countersunk head rivet is conical or flat, and the head diameter is relatively large. Its taper is usually about 120°. This shape enables the head of the rivet to be flush with the surface of the connected part after installation, forming a smooth surface without affecting the overall appearance. It is especially suitable for occasions with high requirements for surface flatness.

Shank Structure: Generally, it has a cylindrical shank. Similar to the rough flat tapered head rivet, the diameter of the shank is relatively thick to provide sufficient connection strength. The shank is usually solid to ensure good mechanical properties when bearing tensile and shear forces. However, there are also special designs that use a hollow shank to meet specific needs, such as reducing weight or facilitating installation.

Material Selection of the Rough Countersunk Head Rivet

Carbon Steel: It has high strength and hardness and can bear large loads. It is suitable for places with high requirements for connection strength in the general industrial field, such as the connection of ordinary mechanical structures.

Stainless Steel: It has strong corrosion resistance and can be used in harsh environments, such as humid outdoor environments and industrial environments with the risk of chemical corrosion. It can ensure that the rivet will not be corroded during long-term use and maintain the connection performance.

Aluminum Alloy: It is light in weight and has a certain degree of corrosion resistance. It is often used in fields sensitive to weight, such as aerospace and electronic equipment manufacturing. While ensuring the connection strength, it helps to reduce the overall structural weight.

Manufacturing Process of the Rough Countersunk Head Rivet

Forging: The metal material is processed into the approximate shape of the rivet through the forging process, including the preliminary forming of the head and the shank. Forging can improve the internal structure of the metal, enhance the strength and toughness of the rivet, and make it more capable of withstanding the stress during subsequent processing and use.

Machining: Carry out precise dimensional processing on the forged rivet, such as the taper and diameter of the head, and the length and diameter of the shank, to ensure that the dimensional accuracy of the rivet meets the relevant standards. At the same time, carry out surface grinding and polishing treatment to reduce surface defects and improve the surface quality, so that the rivet can fit better with the connected part after installation.

Heat Treatment: For some rough countersunk head rivets with high performance requirements, heat treatment processes such as quenching and tempering will be carried out to further improve their mechanical properties such as hardness, strength, and wear resistance to meet the usage requirements under different working conditions. For example, in some mechanical connection parts with high load and high friction, the heat-treated rivets can better maintain the stability and reliability of the connection.

Application Fields of the Rough Countersunk Head Rivet

Aerospace: It is widely used in the connection of aircraft skins and the assembly of internal structural parts. The countersunk head rivet can keep the surface of the aircraft smooth, reduce air resistance, and at the same time, its high strength and reliability can meet the strict requirements of the aerospace field for structural connections.

Automobile Manufacturing: It is used for the assembly of automobile bodies, such as the connection of parts like doors, engine hoods, and trunk lids. Its countersunk head design can make the surface of the body flat, improve the appearance quality of the automobile, and can withstand various vibrations and stresses during the driving process of the automobile. In the installation of automobile interiors, rough countersunk head rivets are also often used to fix some decorative parts and components to ensure a firm connection without affecting the appearance.

Electronic Equipment: It is relatively common in the assembly of the casings of electronic equipment, such as computer cases and mobile phone casings. It can make the surface of the casing flat and smooth, which is not only beautiful but also can avoid scratches or other potential safety hazards caused by the protrusion of the rivet. At the same time, it can meet the requirements of electronic equipment for connection strength and reliability, ensuring that the connection will not loosen due to vibration or other external forces during the use of the equipment.

Furniture Manufacturing: In the manufacturing of some high-end furniture, rough countersunk head rivets can be used to connect parts made of wood, metal, or other materials. For example, in the connection of the frame structure of furniture and the fixing of decorative strips, its countersunk head design can make the surface of the furniture clean and beautiful, and improve the overall quality of the furniture.

Marking Method of the Rough Countersunk Head Rivet

The marking of the rough countersunk head rivet usually includes information such as the product name, nominal diameter, nominal length, material, and surface treatment. For example, the marking "Rivet, Rough Countersunk Head, GB/T xxx - xxxx, 8×40 - Stainless Steel, Passivated" indicates a rough countersunk head rivet with a nominal diameter of 8mm, a nominal length of 40mm, 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 rough countersunk head rivets should be marked in accordance with the corresponding standards.

Installation Precautions of the Rough Countersunk Head Rivet

Aperture and Hole Depth: During installation, it is necessary to ensure that the diameter of the installation hole on the connected part matches 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. At the same time, the hole depth should be sufficient to ensure that the head of the rivet can be completely sunk into the surface of the connected part to achieve a flat connection effect. If the hole depth is insufficient, the head of the rivet cannot be completely sunk, which will affect the appearance and connection quality; if the hole depth is too large, it may cause the shank of the rivet to be loose in the hole and reduce the connection strength.

Riveting Tools and Pressure: Select appropriate riveting tools according to the material and specification of the rivet, such as pneumatic riveting machines, hydraulic riveting machines, or manual rivet guns. Since the shank of the rough countersunk head rivet is relatively thick, the tool needs to provide a large amount of pressure to complete the riveting. During the riveting process, the magnitude of the pressure should be well controlled. If the pressure is too small, the rivet may not be able to deform sufficiently and will not be closely combined with the connected part; if the pressure is too large, the head of the rivet may be overly deformed or the shank may break, affecting the connection performance.

Verticality and Concentricity: When inserting the rivet into the installation hole, it is necessary to ensure that the axis of the rivet is perpendicular to the surface of the connected part and concentric with the installation hole. This can enable the rivet to be evenly stressed during the riveting process, ensure that the head can be smoothly sunk into the surface of the connected part, and at the same time ensure that the shank is closely matched with the hole wall, improving the strength and stability of the connection. If the rivet is inserted unevenly or not concentrically, problems such as the skewing of the rivet head and insecure connection may occur.