接线端子内部的金属导体是端子的核心零件，它将来自外部电线或电缆的电压，电流或信号传递到与其相配的连接器对应的接触件上。故接触件必须具备优良的结构，稳定可靠的接触保持力和良好的导电性能。由于接触件结构设计不合理，材料选用错误，模具不稳定，加工尺寸超差，表面粗糙，热处理电镀等表面处理工艺不合理，组装不当，贮存使用环境恶劣和操作使用不当，都会在接触件的接触部位和配合部位造成接触不良。

poor contact
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.

bad insulation
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.

  绝缘体不仅起绝缘作用，通常也为伸出的接触件提供精确的对中和保护，同时还具有安装定位，锁紧固定在设备上的功能。固定不良，轻者影响接触可靠造成瞬间断电，严重的就是产品解体。解体是指接线端子在插合状态下，由于材料，设计，工艺等原因导致结构不可靠造成的插头与插座之间，插针与插孔之间的不正常分离，将造成控制系统电能传输和信号控制中断的严重后果。由于设计不可靠，选材错误，成型工艺选择不当，热处理，模具，装配，熔接等工艺质量差，装配不到位等都会造成固定不良。

fixed bad
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.

  此外，由于镀层起皮，腐蚀，碰伤，塑壳飞边，破裂，接触件加工粗糙，变形等原因造成的外观不良，由于定位锁紧配合尺寸超差，加工质量一致性差，总分离力过大等原因造成的互换不良，也是常见病，多发病。接线端子的这几种故障一般都能在检验及使用过程中及时发现剔除。

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.