Light-duty Rolled Elastic Cylindrical Pin

The light-duty rolled elastic cylindrical pin is a mechanical connecting piece with specific structural and performance characteristics. The following is a detailed introduction to the light-duty rolled elastic cylindrical pin:

Definition and Structure of the Light-duty Rolled Elastic Cylindrical Pin

The light-duty rolled elastic cylindrical pin is a hollow cylindrical pin manufactured through a rolling process. It is usually made of elastic materials, with an axial slot and chamfers at both ends. Its unique structure enables it to generate radial tension after installation, thus firmly fixing it in the assembly hole.

Features of the Light-duty Rolled Elastic Cylindrical Pin

Good Elasticity: It can undergo elastic deformation under a relatively small external force, effectively buffering and absorbing impact energy, and can return to its original shape after the external force is removed.

Convenient Installation: Its outer diameter is slightly larger than the assembly hole diameter. It can be gently tapped or pressed into the hole without the need for additional fastening devices, and the installation process is simple and efficient.

Precise Positioning: It can provide relatively accurate positioning for parts, ensuring the accuracy and stability of the connection and reducing assembly errors.

Reusable: Under reasonable usage conditions, if the elastic performance is not severely damaged after disassembly, it can be used again, reducing the usage cost.

Manufacturing Standards of the Light-duty Rolled Elastic Cylindrical Pin

The national standard is GB/T 879.5-2018 "Elastic Cylindrical Pins - Rolled - Light-duty", which clearly stipulates its dimensions, tolerances, materials, surface treatments, and technical requirements. For example, it specifies the length series corresponding to different nominal diameters, as well as the mechanical property requirements of the materials, etc.

Materials and Surface Treatments of the Light-duty Rolled Elastic Cylindrical Pin

Commonly Used Materials: Generally, spring steels such as 65Mn are used, which have high strength and good elasticity. In occasions with requirements for corrosion resistance, stainless steel materials such as 304 stainless steel and 316 stainless steel are used.

Surface Treatments: Common ones include electroplating, such as zinc plating, nickel plating, and chromium plating, which can improve corrosion resistance and wear resistance and increase the surface hardness. Phosphating treatment is also used to form a phosphate protective film, playing a role in rust prevention and lubrication. In some cases, a non-electrolytic zinc flake coating will be added to steel elastic pins, and stainless steel elastic pins will be passivated.

Application Fields of the Light-duty Rolled Elastic Cylindrical Pin

Connection of Plastic Parts: It is often used for the connection and fixation of plastic hinges and plastic parts. For example, in the connection between the housing of the gear shift lever of an automobile transmission and the base, it can provide a reliable connection without damaging the plastic parts.

Assembly of Electronic Equipment: In electronic equipment, it can be used to fix circuit boards, small components, etc., meeting the requirements of miniaturization and high precision of electronic equipment.

Manufacturing of Instruments and Meters: It can meet the connection and positioning requirements of precision parts in instruments and meters, ensuring that the instruments can still maintain accuracy and stability in an environment with slight vibrations.

Marking Method of the Light-duty Rolled Elastic Cylindrical Pin

For example, a light-duty rolled elastic cylindrical pin with a nominal diameter \(d = 6mm\), a nominal length \(l = 30mm\), a material of steel (St), a heat treatment hardness of 420 - 545HV30, and a surface oxidation treatment is marked as: Pin GB/T 879.5 6×30. If the material is austenitic stainless steel (A), without heat treatment and with a simple surface treatment, it is marked as: Pin GB/T 879.5 6×30 - A.

Purchase Precautions for the Light-duty Rolled Elastic Cylindrical Pin

Dimensional Accuracy: According to the actual assembly requirements, select pins with dimensional accuracy that meet the requirements to ensure a reasonable fit clearance with the installation hole, so as to achieve good positioning and connection.

Material Performance: Select materials according to the usage environment and working conditions. For example, in a humid environment, stainless steel materials with good corrosion resistance should be selected. In occasions with large impact loads, the strength and toughness of the materials need to be considered.

Product Quality: Check the appearance, which should have no defects such as cracks, burrs, and deformations. At the same time, request the supplier to provide a quality inspection report to ensure that the product meets the relevant standards.

Installation and Maintenance of the Light-duty Rolled Elastic Cylindrical Pin

Installation: During installation, special tools such as a press-in tool or a punch can be used to smoothly press or tap the pin into the installation hole, avoiding oblique installation. For occasions with high-precision requirements, it is necessary to clean and lubricate the installation hole and the pin to ensure the smooth progress of the installation and the fit accuracy.

Maintenance: Regularly check the usage of the pin, and observe whether there are problems such as wear, deformation, looseness, or corrosion. If any, it should be replaced in a timely manner to ensure the normal operation of the equipment. For pins working in harsh environments, the inspection cycle can be appropriately shortened.