Explain the termination of rj45 connector contacts

The termination of rj45 connector contacts is classified as follows, and the termination methods are divided into two categories: separable connection and permanent connection: 1. Separable connection: there are three methods: direct contact pressure exerted by springs, direct contact pressure generated by screws, and contact pressure generated by wedges. There is a problem of contact point friction. Typical such as screw-fixed terminals and plug-in terminals; Permanent connection of 2、: There are many ways to achieve permanent electrical connection by thermal and chemical methods, such as soldering, brazing, spot welding, conductive adhesive bonding, etc. Permanent electrical connections by mechanical means, such as crimping, wire wrapping, cold welding, riveting, etc.

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Rj45 connector contact termination commonly used termination methods 1, welding, generally including wire and contact welding, contact and printed board welding two kinds, commonly used manual and wave soldering connection, the principle is that the solder "wet" the surface of other metals and form a soldering combination, in which there is a complex physical, chemical and metallurgical forces and effects intertwined. The key factors of firm bonding are the control of welding temperature, the control of welding time, the cleanliness of welding surface, etc. Flux and solder are required, and there may be hidden dangers in the microstructure of the solder joint due to various improper operations; 2. Crimping. Crimping has high reliability, convenient operation, high speed, low requirements for personnel quality, and can avoid chemical pollution and thermal pollution. There are many forms of crimping. Cylindrical crimping is mostly used for military products, which can be removable and replaceable or non-removable and replaceable. The most important thing is the correct coordination among the conductor, terminal and operating tools. In addition, the conductor shall not be damaged during stripping, and the insertion depth of the conductor shall be appropriate. Crimping tools include manual crimping pliers, automatic or semi-automatic crimping machines, etc. 3、 winding is to wind the solid conductor on a pole with edges and corners under tension, so that the solid conductor is deformed at the edges and corners, resulting in an airtight contact surface between the conductor and the pole. See MIL-STD-1130 for the technical requirements of wire wrapping. There are manual wire wrapping gun and automatic wire wrapping equipment controlled by program. There are two types of wire wrapping. One is the bare wire wound on the pole; the other is the wire with the insulation sheath reserved at the last circle of the root. The most prominent feature of winding is its high reliability, which is 2-3 orders of magnitude higher than soldering. It is easy to operate and easy to withdraw when the winding is wrong or the circuit is improved. However, the current flowing through is almost entirely through the first few turns, which requires space for winding and is only suitable for single-strand flexible conductors with small cross sections, so its use is limited. 4. Insertion is a separable physical connection method, that is, the termination part of the pin and female connector is inserted into the metallized hole of the multilayer printed board, and the elastic structure of the termination part is in contact with the metallized hole. Puncture of the 5、, which is actually the crimping of the pin and female connector contacts to the ribbon cable, occurs either by breaking through the insulation (surround conductor crimping) or by piercing the conductor itself to form a crimp (piercing conductor crimping).

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