LeadwireThe plastic insulation materials and conductive parts of the terminal are directly related to the quality of the terminal. They determine the insulation function and conductive function of the terminal respectively. Failure of any terminal will lead to failure of the whole system engineering. In this regard, the bitter lessons at home and abroad are very profound. Prevention is the purpose, while analysis is the foundation. In a sense, preventing failure is more important than analyzing failure. It has a more realistic meaning to ensure the quality and reliability of the terminal wire.
From the point of view of application, the terminal should achieve the following functions: it is necessary to conduct the local conduction of the touch part, and touch firmly. Where the insulation part should not be connected, it is necessary to insulate firmly. There are three common ways of terminal death:

1. Poor insulation
The function of the insulator is to make the touch stick to the correct orientation and insulate the touch piece from the touch piece and the touch piece from the shell. Therefore, it is necessary for insulating parts to have excellent electrical functions, mechanical functions and process molding functions. Especially with the wide application of high-density and miniaturized terminals, the effective wall thickness of insulators is becoming thinner and thinner. This puts forward more stringent requirements for insulation materials, injection mold precision and molding process. Short circuit, electric leakage, breakdown and low insulation resistance are all caused by metal residues on the surface or inside of the insulator, contamination and moisture on the surface of the insulator, organic material precipitates and harmful gas adsorption film and the surface water film to form ionic conductive channels, moisture absorption, mold growth, aging of insulation materials, etc.

2. Poor fixation
Insulators not only play the role of insulation, but also provide accurate alignment and protection for the extended touch pieces. At the same time, they also have the function of device positioning, locking and fixing on the equipment. Poor fixation, the light one will affect the firm touch and cause instant power failure, and the severe one is the product collapse. Collapse refers to the abnormal separation between plug and socket and between pin and socket caused by unreliable structure due to data, planning, process and other reasons when the terminal wire is plugged in and out, which will result in severe consequences of power transmission and signal control suspension of the control system. Poor fixation will be caused by unreliable planning, wrong material selection, improper selection of molding process, poor quality of heat treatment, mold, assembly, welding and other processes, and poor assembly.

3. Poor touch
The metal conductor inside the terminal wire is the core part of the terminal. It transmits the voltage, current or signal from the external wire or cable to the touch piece corresponding to its matching connector. Therefore, it is necessary for the touch element to have excellent structure, stable and reliable touch persistence and excellent conductive function. Because the structure planning of the touch piece is unreasonable, the data selection is wrong, the mold is unstable, the processing scale is out of tolerance, the appearance is rough, the surface treatment process such as heat treatment and electroplating is unreasonable, the assembly is improper, the storage and application environment is bad, and the operation and application are improper, all of which will cause poor touch at the touch part and the matching part of the touch piece.