Processing and wholesale of various types of hardware non-standard parts, non-standard cold heading accessories, fasteners, small cold heading accessories, rivets

definition
A rivet is a fastener used to join two or more parts. It achieves the fastening function through its own deformation and is usually composed of a head and a stem. Small cold heading accessories rivets are small rivets manufactured using the cold heading process. This process applies pressure to the metal material at room temperature, causing it to plastically deform in the mold, thereby forming the shape of the rivet.
Structural features
Head: Rivet heads come in various shapes, the common ones are semi-round head, flat head, countersunk head, semi-countersunk head, pan head and cylindrical head. Different head shapes are suitable for different connection scenarios. For example, the head of a semicircular head rivet is hemispherical, beautiful and can withstand a large pulling force. It is often used in connections that have certain requirements on appearance and bear large forces; the head of a countersunk head rivet can be embedded in the surface of the connected parts. Make the surface after connection smooth, suitable for occasions where the surface needs to be kept smooth, such as the connection of aircraft skins.
Rod: The rod is generally cylindrical, and its diameter and length are determined according to the specific connection requirements. The diameter of the rod needs to match the hole diameter of the connected parts, and the length must ensure that sufficient tightening force can be formed after riveting. In some special rivets, the stem may have some special designs, such as a grooved stem, which can better fill the material during the riveting process and enhance the firmness of the connection.
(2) Material characteristics
Metal material selection
Carbon Steel: Carbon steel rivets are one of the most common types. It has good strength and toughness and the price is relatively low. For example, low carbon steel rivets with a carbon content of 0.2% - 0.3% are suitable for the connection of general mechanical structures and can withstand certain shear and tensile forces. In the cold heading process, carbon steel has better processing performance and is easy to form.
Stainless Steel: Stainless steel rivets offer excellent corrosion resistance. Common ones are 304 and 316 stainless steel. 304 stainless steel is suitable for connections in general environments, such as food processing equipment, general building decoration, etc.; 316 stainless steel contains molybdenum elements and is more corrosion-resistant, and is suitable for connections of equipment working in harsh environments, such as marine engineering equipment and chemical equipment. wait. When stainless steel rivets are cold-headed, although the material hardness is relatively high, they can be formed smoothly with appropriate molds and process parameters.
Aluminum alloy: Aluminum alloy rivets are lightweight and have good electrical and thermal conductivity. It is mainly used in fields with strict weight requirements, such as aerospace, electronic equipment, etc. For example, 2024 aluminum alloy rivets have high strength and are often used for connecting aircraft structures; 6061 aluminum alloy rivets have good processing performance and corrosion resistance and are suitable for connecting components such as electronic equipment casings. When cold heading aluminum alloys, due to their good plasticity, they can be quickly formed, but care needs to be taken to prevent surface scratches.
(3) Advantages of cold heading process
High efficiency and energy saving
Cold heading is an efficient forming process. It is carried out at normal temperature, does not require heating of metal materials, and saves a lot of energy compared with processes such as hot heading. Moreover, the cold heading machine has a fast production speed and can produce dozens or even hundreds of rivets per minute, which greatly improves production efficiency. For example, in an automated cold heading production line, large-scale rivet production can be achieved through continuous feeding and automatic forming systems.
Higher accuracy
The cold heading process uses precision molds to form rivets. The accuracy of the mold directly determines the dimensional accuracy and shape accuracy of the rivets. Under normal circumstances, the diameter tolerance of cold heading rivets can be controlled within ±0.05mm, and the length tolerance can be controlled within ±0.1mm. Moreover, the coaxiality of the head and the rod can also be well guaranteed, which is very important for occasions that require high-precision connection.
High material utilization rate
The cold heading process mainly manufactures rivets through the plastic deformation of metal. The material loss mainly lies in the blank blanking stage and a small amount of corner waste. Compared with traditional cutting processing, the material utilization rate of the cold heading process can be increased to 80% - 90%, reducing material waste and lowering production costs.

(1) Automobile manufacturing
Body assembly
During the automobile body assembly process, small cold heading rivets are used to connect body frames, doors, hoods and other components. For example, high-strength carbon steel rivets are used in the connection of the body frame, which can withstand various stresses during the driving process of the body, including vibration, distortion, etc. In the internal structural connection of the car door, the use of stainless steel rivets can prevent rust and increase the service life of the door.
Interior installation
The installation of car interiors is also inseparable from rivets. Such as seat fixation, instrument panel assembly, etc. Aluminum alloy rivets are often used to connect interior parts because they are light in weight, do not add too much weight to the car, and have a beautiful appearance.
(2) Aerospace
Aircraft body structure
The connection of aircraft bodies places extremely high demands on rivets. In the connection of wings, fuselage and other structures, rivets with high precision, high strength and high corrosion resistance are used. For example, 2024 aluminum alloy cold heading rivets are used to connect the skin and frame of aircraft wings. This rivet is not only lightweight, but also strong enough to withstand various aerodynamic and mechanical loads during flight. At the same time, since aircraft are in complex environments, the corrosion resistance of rivets is also very important. 316 stainless steel rivets are sometimes used for connections in some key parts.
Aero engine parts
There are many high-temperature, high-pressure, and high-vibration environments inside aeroengines, which require the use of special rivets to connect components. These rivets are usually made of high-temperature alloy materials and formed through a cold heading process. They maintain connection stability in extreme environments and ensure safe engine operation.
(3) Electronic equipment
Consumer electronics assembly
In the assembly of consumer electronics such as mobile phones, tablets, and laptops, small cold heading rivets are used to connect components such as casings and circuit boards. For example, small stainless steel rivets are used to connect the metal frame and plastic back cover of the mobile phone casing, which can not only ensure the firmness of the connection, but also prevent rust and increase the service life of the product. In the fixation of circuit boards, aluminum alloy rivets are used because they have good conductivity and will not interfere with the electrical performance of electronic equipment.
Electronic equipment housing manufacturing
For the casings of some high-end electronic equipment, such as professional audio equipment, high-end servers, etc., cold heading rivets are used to connect different parts of the casing to make the casing structure stronger and more beautiful. At the same time, since the use environment of these equipment may be complex, the corrosion resistance and stability of the rivets are also very important.
(4) Construction and decoration
steel structure building
In steel structure buildings, small cold heading rivets are used to connect steel beams, steel columns and other structural components. For example, in the connection of steel structure frames in large industrial plants, stadiums and other buildings, the use of high-strength carbon steel rivets can ensure the overall stability of the steel structure. In the connection of metal plates on the roof and wall of a building, the use of stainless steel rivets can improve the corrosion resistance of the building and extend the service life of the building.
interior decoration
In interior decoration, rivets are used to connect some metal decorative parts, furniture, etc. For example, in the production of metal screens, aluminum alloy rivets are used to connect the frame and panels of the screen, which is both beautiful and strong. In the assembly of furniture, such as the connection of metal chairs, rivets can also be used, which is convenient and quick.