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Application of cold heading technology in rivet processing
Cold heading is an important process in rivet manufacturing. At normal temperature, the metal wire (such as carbon steel, stainless steel, etc.) is quickly upset into the head shape of the rivet through a press and a mold. For example, for semicircular head rivets, the cold heading die will press one end of the wire into a hemispherical head. This process uses the plastic deformation of metal to complete the shape in a short time, which is more efficient than traditional cutting.
Characteristics of precision hardware
High dimensional accuracy: Precision hardware rivets are precision processed after cold heading, and the dimensional tolerance can be controlled within a very small range. For example, the rivet diameter tolerance can reach ±0.01mm and the length tolerance can reach ±0.05mm, which can meet the requirements of high-precision assembly.
Good shape accuracy: The shape of the rivet is regular, and the coaxiality of the head and the stem is high. For example, for rivets used in the aerospace field, the coaxiality of the head and stem can be controlled within 0.03mm to ensure uniform force when connecting structures.
Good surface quality: After grinding, polishing and other surface treatment processes, the surface roughness of the rivets is low. For example, the surface roughness Ra of rivets in some electronic products can reach less than 0.4μm, which is not only beautiful but also reduces wear on the connecting materials.
(2) Materials
carbon steel
Ordinary carbon steel rivets have lower cost and moderate strength. For example, Q235 carbon steel is often used for connecting rivets in general mechanical structures. It has low carbon content, good toughness, and can withstand certain shear and tensile forces. During cold heading processing, carbon steel has good plasticity and is easy to form.
Stainless steel
Stainless steel rivets have excellent corrosion resistance. Such as 304 and 316 stainless steel, 304 stainless steel rivets are suitable for corrosion-resistant connections in general environments, such as food processing equipment, kitchen utensils, etc.; 316 stainless steel contains molybdenum element and has stronger corrosion resistance, and is often used in marine environments, chemical equipment, etc. to resist corrosion Sensitive occasions.
Aluminum alloy
Aluminum alloy rivets are lightweight and have good electrical and thermal conductivity. It is widely used in aerospace and electronic equipment fields. For example, 2A12 aluminum alloy rivets are used to connect aircraft skins. Their low density can reduce the weight of the aircraft, while they have a certain strength and meet flight safety requirements.
(3) Processing technology characteristics
Efficient production
The cold heading process can achieve rapid mass production of rivets. A cold heading machine can produce dozens to hundreds of rivets per minute, and through automated feeding and forming systems, the production efficiency is high. For example, in automobile manufacturing, a large number of body rivets can be produced in a short time to meet the assembly needs of the production line.
High material utilization rate
Cold heading uses the plastic deformation of metal, and the material is mainly lost in the blank and a small amount of corner scrap. Compared with cutting processing, the material utilization rate is greatly improved. Generally speaking, the material utilization rate of cold heading rivets can reach 80% - 90%, reducing material waste and costs.
Stable quality
The cold heading process combined with precision machining can ensure stable quality of rivets. Due to the precise control of the mold, the rivets have good consistency in size, shape and performance. For example, in the same batch of precision rivets, the deviations in various quality indicators are extremely small, which is conducive to achieving high-quality assembly.

(1) Automobile industry
Body connection
The automobile body has a large number of panels that need to be connected, and rivets are one of the important connection methods. Cold heading precision hardware rivets are used to connect side panels, roof panels and other components of automobile bodies. Their high precision and good strength can ensure the overall structural strength of the vehicle body. For example, in the assembly of car doors, rivets are used to connect the inner and outer panels to ensure the sealing and safety of the door.
Interior installation
Rivets are also used in the installation of automotive interior parts. For example, the use of precision rivets for fixing parts such as seats and dashboards can make the interior decoration firmly installed, and due to the good surface quality of the rivets, the interior materials will not be scratched.
(2) Aerospace field
Aircraft body assembly
Rivets are widely used in the assembly of aircraft wings, fuselage and other structures. Due to high aviation safety requirements, rivets require extremely high precision and performance. Cold heading precision hardware rivets can meet the requirements for strength, fatigue life and corrosion resistance of aircraft structural connections. For example, in the connection between the skin and the frame of an aircraft wing, the quality of the rivets directly affects the aerodynamic performance and structural safety of the wing.
Aero engine parts
There are many parts that need to be connected inside an aeroengine, such as blades, combustion chambers, etc. Precision rivets are used to connect these components and can withstand high temperature, high pressure and high vibration environments to ensure reliable operation of the engine.
(3) Electronic equipment
Mobile phone and computer assembly
In the assembly of mobile phone and computer casings, circuit boards and other components, cold heading precision hardware rivets play a role in fixing and connecting. For example, the metal frame of the mobile phone casing is connected by rivets, which ensures the structural stability of the mobile phone. At the same time, the high precision of the rivets also helps achieve a thin and light design. In the fixation of computer motherboards, rivets can provide reliable electrical and mechanical connections.
Electronic equipment housing manufacturing
For the casing manufacturing of some high-end electronic devices, such as tablet computers, digital cameras, etc., precision rivets are used to connect different parts of the casing to make the casing compact and beautiful. At the same time, due to the corrosion resistance and good surface quality of rivets, the overall quality of electronic equipment can be improved.
(4) Construction industry
Steel structure connection
In building steel structures, rivets are used to connect steel beams, steel columns and other components. The high strength and stability of cold heading precision hardware rivets can ensure the safety of steel structure buildings. For example, in the frame connections of steel structure buildings such as large stadiums and exhibition halls, the quality of rivets is crucial to the overall stability of the building.
Curtain wall installation
Rivets are also used in the installation of building curtain walls. The metal plates and keels of the curtain wall are connected by rivets. Precision rivets can ensure the flatness and firmness of the curtain wall while resisting erosion by wind, rain and other natural factors.