The metal conductor in the terminal is the core part of the terminal, which transfers the voltage, current or signal from an external wire or cable to the contact corresponding to the connector to which it is matched. Therefore, the contact parts must have excellent structure, stable and reliable contact force and good electrical conductivity. Because the contact structure is not reasonable, the mold material selection errors, unstable machining dimension tolerance, surface roughness, heat treatment, electroplating and other surface treatment process is not reasonable, improper assembly, storage and operation environment of improper use will be in the contact portions of the contacts and the matched parts caused by poor contact.
The function of an insulator is to keep the contacts in the correct position and to keep the contact between the contact and the contact between the contact and the shell. Therefore, insulation must have excellent electrical performance, mechanical properties and process forming performance. Especially with the widespread use of high-density and miniaturized wiring terminals, the effective wall thickness of insulators becomes thinner and thinner. This is more stringent requirements for insulation materials, injection molding precision and molding process. Due to the presence of metal particles, the insulator surface or inner surface of the dust pollution, flux moisture, organic material precipitates and harmful gas adsorption and membrane fusion to form water film on the surface of ion conductive channel, absorption of moisture, mildew, material aging insulation, can cause leakage, short circuit, low breakdown, poor insulation insulation resistance the phenomenon of.
Insulators not only provide insulation, but also provide accurate protection for the extended contacts, as well as the function of installation, positioning and locking on the equipment. Fixed bad, light influence contact reliable, cause instant power failure, serious is product disintegration. Refers to the disintegration of terminals inserted in the state, because of the material, design, technology and other causes between the plug and the socket structure caused by unreliable, between pin and Jack is not normal separation, will cause serious consequences of power transmission and signal control interrupt control system. Because of the unreliable design, the wrong material selection, the improper selection of the forming process, the poor quality of the heat treatment, the mold, the assembly, the welding, the assembly is not in place and so on, it will cause the fixed bad.
In addition, because the coating peeling, corrosion, scratches, plastic flash, rupture, contact roughness, deformation and other reasons caused by poor appearance, due to positioning and locking with oversize, machining quality consistency is poor, poor exchange total separation excessive force causes, also is a common disease, frequently occurring disease. These faults can be found and eliminated in the process of inspection and use.