The metal conductor inside the terminal is the core part of the terminal that transfers the voltage, current or signal from the external wire or cable to the corresponding contact of the mating connector. Therefore, the contact member must have an excellent structure, stable and reliable contact retention and good electrical conductivity. Due to the unreasonable design of the contact structure, the wrong selection of materials, unstable mold, poor processing size, rough surface, unreasonable surface treatment process such as heat treatment plating, improper assembly, poor storage and use environment, improper operation, will be in the contact parts. Contact and fitting parts cause poor contact. The plastic insulation and conductive parts of the terminals are directly related to the quality of the terminals, which determine the insulation and electrical conductivity of the terminals. Failure of any of the terminals will result in failure of the entire system engineering. The painful lessons that have taken place at home and abroad in this regard are very profound.
The function of the terminal insulator is to keep the contacts in the correct position and to insulate the contacts from the contacts and the contacts from the housing. Therefore, the insulation must have excellent electrical properties, mechanical properties and process forming properties. In particular, with the high density and wide use of miniaturized terminals, the effective wall thickness of the insulator is getting thinner and thinner. Terminals place more stringent requirements on insulation materials, injection mold accuracy and molding processes. Due to metal impurities on the surface or inside of the insulator, surface dust, flux and other pollution are damp, organic material precipitates and harmful gas adsorption film and surface water film fuse to form ionic conductive channels, moisture absorption, mildew, insulation material aging and other reasons, It will cause short circuit, leakage, breakdown, low insulation resistance and other insulation problems.
The terminal insulator not only acts as an insulator, but also provides precise centering and protection for the extended contacts, as well as mounting and locking to the device. Poor fixing, light contact affects reliable momentary power outage, and serious product disintegration. Disintegration refers to the abnormal separation between the plug and the socket between the plug and the socket caused by the unreliable structure due to the material, design, process, etc., which causes the control system to transmit power and The serious consequences of signal control interruption. Due to the unreliable design, incorrect selection of terminal blocks, improper selection of molding processes, poor quality of heat treatment, mold, assembly, welding, etc., the assembly is not in place, etc., which will cause poor fixing. In addition, due to peeling, corrosion, bumping, plastic shell flashing, cracking, rough processing of contact parts, deformation of terminal parts, etc., the appearance is poor, due to the poor positioning of the positioning and locking, the consistency of processing quality is poor, the total separation Poor exchange caused by excessive force and other reasons is also a common disease and frequently-occurring disease. These kinds of faults can generally be found in the inspection and use process in time.
